From 308fa19b68670756957a3514e3101e560184a206 Mon Sep 17 00:00:00 2001
From: Ageev Pavel <ageev.pavel.v@gmail.com>
Date: Fri, 18 Dec 2020 01:28:41 +0300
Subject: [PATCH] Initial commit

---
 .github/CODEOWNERS                            |   2 +
 .github/ISSUE_TEMPLATE/bug_report.md          |  35 ++
 .github/ISSUE_TEMPLATE/feature_request.md     |  24 +
 .github/pull_request_template.md              |  20 +
 .github/workflows/main.yml                    | 181 ++++++++
 .gitignore                                    |   5 +
 .golangci.yml                                 |   6 +
 AUTHORS                                       |  11 +
 CONTRIBUTORS                                  |   9 +
 LICENSE                                       | 202 +++++++++
 Makefile                                      | 123 ++++++
 README.md                                     |  40 ++
 bin/.gitignore                                |   2 +
 build/docker/cmd/pinchy/Dockerfile            |   7 +
 build/docker/utils/wire/Dockerfile            |   6 +
 cmd/pinchy/internal/command.go                |  76 ++++
 cmd/pinchy/internal/modules.go                |   8 +
 cmd/pinchy/internal/provider.go               |  77 ++++
 cmd/pinchy/internal/wire.go                   |  42 ++
 cmd/pinchy/main.go                            |  23 +
 configs/source/file/example.yaml              |   9 +
 .../docker-compose/consul/docker-compose.yml  |  29 ++
 docs/README.md                                |   7 +
 docs/contributing-guide.md                    |  22 +
 docs/registry/consul.md                       |   7 +
 docs/source/file.md                           |  20 +
 docs/user-guide.md                            |  64 +++
 go.mod                                        |  25 ++
 go.sum                                        | 414 ++++++++++++++++++
 internal/extension/extension.go               |  21 +
 internal/extension/extension_test.go          |  58 +++
 .../extension/registry/consul/provider.go     |  63 +++
 internal/extension/registry/consul/wire.go    |  23 +
 internal/extension/registry/extension.go      |  97 ++++
 internal/extension/registry/extension_test.go | 332 ++++++++++++++
 internal/extension/source/extension.go        |  97 ++++
 internal/extension/source/extension_test.go   | 332 ++++++++++++++
 internal/extension/source/file/provider.go    |  41 ++
 internal/extension/source/file/wire.go        |  22 +
 pkg/core/logger.go                            |  35 ++
 pkg/core/manager.go                           | 123 ++++++
 pkg/core/manager_test.go                      | 282 ++++++++++++
 pkg/core/registry.go                          |  15 +
 pkg/core/registry/consul/registry.go          |  87 ++++
 pkg/core/registry/consul/registry_test.go     | 221 ++++++++++
 pkg/core/scheduler.go                         |  37 ++
 pkg/core/scheduler_test.go                    |  98 +++++
 pkg/core/service.go                           |  53 +++
 pkg/core/service_test.go                      | 128 ++++++
 pkg/core/source.go                            |  13 +
 pkg/core/source/file/source.go                |  55 +++
 pkg/core/source/file/source_test.go           | 126 ++++++
 test/.gitignore                               |   2 +
 53 files changed, 3857 insertions(+)
 create mode 100644 .github/CODEOWNERS
 create mode 100644 .github/ISSUE_TEMPLATE/bug_report.md
 create mode 100644 .github/ISSUE_TEMPLATE/feature_request.md
 create mode 100644 .github/pull_request_template.md
 create mode 100644 .github/workflows/main.yml
 create mode 100644 .gitignore
 create mode 100644 .golangci.yml
 create mode 100644 AUTHORS
 create mode 100644 CONTRIBUTORS
 create mode 100644 LICENSE
 create mode 100644 Makefile
 create mode 100644 README.md
 create mode 100644 bin/.gitignore
 create mode 100644 build/docker/cmd/pinchy/Dockerfile
 create mode 100644 build/docker/utils/wire/Dockerfile
 create mode 100644 cmd/pinchy/internal/command.go
 create mode 100644 cmd/pinchy/internal/modules.go
 create mode 100644 cmd/pinchy/internal/provider.go
 create mode 100644 cmd/pinchy/internal/wire.go
 create mode 100644 cmd/pinchy/main.go
 create mode 100644 configs/source/file/example.yaml
 create mode 100644 deploy/docker-compose/consul/docker-compose.yml
 create mode 100644 docs/README.md
 create mode 100644 docs/contributing-guide.md
 create mode 100644 docs/registry/consul.md
 create mode 100644 docs/source/file.md
 create mode 100644 docs/user-guide.md
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 internal/extension/extension.go
 create mode 100644 internal/extension/extension_test.go
 create mode 100644 internal/extension/registry/consul/provider.go
 create mode 100644 internal/extension/registry/consul/wire.go
 create mode 100644 internal/extension/registry/extension.go
 create mode 100644 internal/extension/registry/extension_test.go
 create mode 100644 internal/extension/source/extension.go
 create mode 100644 internal/extension/source/extension_test.go
 create mode 100644 internal/extension/source/file/provider.go
 create mode 100644 internal/extension/source/file/wire.go
 create mode 100644 pkg/core/logger.go
 create mode 100644 pkg/core/manager.go
 create mode 100644 pkg/core/manager_test.go
 create mode 100644 pkg/core/registry.go
 create mode 100644 pkg/core/registry/consul/registry.go
 create mode 100644 pkg/core/registry/consul/registry_test.go
 create mode 100644 pkg/core/scheduler.go
 create mode 100644 pkg/core/scheduler_test.go
 create mode 100644 pkg/core/service.go
 create mode 100644 pkg/core/service_test.go
 create mode 100644 pkg/core/source.go
 create mode 100644 pkg/core/source/file/source.go
 create mode 100644 pkg/core/source/file/source_test.go
 create mode 100644 test/.gitignore

diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..89883f5
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,2 @@
+* @insidieux
+* @Sigthror
diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
new file mode 100644
index 0000000..fcc7252
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -0,0 +1,35 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: insidieux, Sigthror
+
+---
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Steps to reproduce the behavior:
+ - Run binary with flags '...'
+ - ...
+ - See error
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.
+
+**Environment:**
+
+ - Version: [e.g. v1.0.0]
+ - GOOS: [e.g. linux, darwin]
+
+**Additional context**
+
+ - Logs
+ - Stacktrace
+
+Add any other context about the problem here.
diff --git a/.github/ISSUE_TEMPLATE/feature_request.md b/.github/ISSUE_TEMPLATE/feature_request.md
new file mode 100644
index 0000000..73db2e3
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -0,0 +1,24 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: insidieux, Sigthror
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+
+Add any other context or information about the feature request here.
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 0000000..7285bc4
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,20 @@
+**Description**
+
+Please include a summary of the change and which issue was fixed. 
+Please also include relevant motivation and context.
+
+Fixes # (issue)
+
+**Type of change** 
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+
+**Checklist**
+- [ ] This PR contains documentation
+- [ ] This PR contains tests
+- [ ] This PR has been tested for backwards compatibility
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..c528a19
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,181 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - '*'
+    tags:
+      - 'v*'
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Cache vendor
+        id: cache-vendor
+        uses: actions/cache@v2
+        with:
+          path: vendor
+          key: ${{ github.sha }}
+      - name: Vendoring
+        if: steps.cache-vendor.outputs.cache-hit != 'true'
+        run: make vendor
+      - name: Generate wire injectors
+        run: make wire
+      - name: Lint
+        run: make lint
+      - name: Run tests
+        run: make test
+      - name: Send code coverage report
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          file: test/coverage.out
+
+  binary:
+    name: Build binary
+    runs-on: ubuntu-18.04
+    needs: test
+    if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')
+    strategy:
+      matrix:
+        goos: [ darwin, linux, windows ]
+        goarch: [ amd64 ]
+      max-parallel: 3
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Cache vendor
+        id: cache-vendor
+        uses: actions/cache@v2
+        with:
+          path: vendor
+          key: ${{ github.sha }}
+      - name: Vendoring
+        if: steps.cache-vendor.outputs.cache-hit != 'true'
+        run: make vendor
+      - name: Generate wire injectors
+        run: make wire
+      - name: Get tag reference
+        id: get-tag-reference
+        uses: ankitvgupta/ref-to-tag-action@master
+        with:
+          ref: ${{ github.ref }}
+          head_ref: ${{ github.head_ref }}
+      - name: Build
+        run: make build GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} BUIlD_VERSION="${{ steps.get-tag-reference.outputs.tag }}"
+      - name: Upload compiled binary
+        uses: actions/upload-artifact@v2
+        with:
+          name: pinchy-${{ matrix.goos }}-${{ matrix.goarch }}
+          path: bin/pinchy
+
+  image:
+    name: Push docker image
+    runs-on: ubuntu-18.04
+    needs: binary
+    if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')
+    strategy:
+      matrix:
+        goos: [ linux ]
+        goarch: [ amd64 ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Download compiled binary
+        uses: actions/download-artifact@v2
+        with:
+          name: pinchy-${{ matrix.goos }}-${{ matrix.goarch }}
+          path: bin
+      - name: Get tag reference
+        id: get-tag-reference
+        uses: ankitvgupta/ref-to-tag-action@master
+        with:
+          ref: ${{ github.ref }}
+          head_ref: ${{ github.head_ref }}
+      - name: Build docker image for github registry
+        run: |
+          make docker-image-build DOCKER_TAG=${{ steps.get-tag-reference.outputs.tag }}
+      - name: Push docker image to github registry
+        run: |
+          make docker-image-push \
+            DOCKER_USER=${{ github.actor }} \
+            DOCKER_PASSWORD=${{ secrets.GITHUB_TOKEN }} \
+            DOCKER_TAG=${{ steps.get-tag-reference.outputs.tag }}
+      - name: Build docker image for github registry as latest
+        run: |
+          make docker-image-build DOCKER_TAG="latest"
+      - name: Push docker image to github registry as latest
+        run: |
+          make docker-image-push \
+            DOCKER_USER=${{ github.actor }} \
+            DOCKER_PASSWORD=${{ secrets.GITHUB_TOKEN }} \
+            DOCKER_TAG="latest"
+      - name: Build docker image for docker hub registry
+        run: |
+          make docker-image-build \
+            DOCKER_IMAGE=${{ github.repository }} \
+            DOCKER_TAG=${{ steps.get-tag-reference.outputs.tag }}
+      - name: Push docker image to docker hub registry
+        run: |
+          make docker-image-push \
+            DOCKER_REGISTRY=docker.io \
+            DOCKER_IMAGE=${{ github.repository }} \
+            DOCKER_USER=${{ secrets.DOCKER_HUB_USERNAME }} \
+            DOCKER_PASSWORD=${{ secrets.DOCKER_HUB_PASSWORD }} \
+            DOCKER_TAG=${{ steps.get-tag-reference.outputs.tag }}
+      - name: Build docker image for docker hub registry as latest
+        run: |
+          make docker-image-build \
+            DOCKER_IMAGE=${{ github.repository }} \
+            DOCKER_TAG="latest"
+      - name: Push docker image to docker hub registry as latest
+        run: |
+          make docker-image-push \
+            DOCKER_REGISTRY=docker.io \
+            DOCKER_IMAGE=${{ github.repository }} \
+            DOCKER_USER=${{ secrets.DOCKER_HUB_USERNAME }} \
+            DOCKER_PASSWORD=${{ secrets.DOCKER_HUB_PASSWORD }} \
+            DOCKER_TAG="latest"
+  release:
+    name: Upload release asset
+    runs-on: ubuntu-18.04
+    needs: binary
+    if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')
+    strategy:
+      matrix:
+        goos: [ darwin, linux, windows ]
+        goarch: [ amd64 ]
+      max-parallel: 3
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Download compiled binary
+        uses: actions/download-artifact@v2
+        with:
+          name: pinchy-${{ matrix.goos }}-${{ matrix.goarch }}
+          path: bin
+      - name: Tar artifact
+        run: tar -zcvf pinchy-${{ matrix.goos }}-${{ matrix.goarch }}.tar.gz -C bin pinchy
+      - name: Get tag reference
+        id: get-tag-reference
+        uses: ankitvgupta/ref-to-tag-action@master
+        with:
+          ref: ${{ github.ref }}
+          head_ref: ${{ github.head_ref }}
+      - name: Upload binaries to release
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: pinchy-${{ matrix.goos }}-${{ matrix.goarch }}.tar.gz
+          asset_name: pinchy-${{ matrix.goos }}-${{ matrix.goarch }}.tar.gz
+          tag: ${{ steps.get-tag-reference.outputs.tag }}
+          release_name: Pinchy ${{ steps.get-tag-reference.outputs.tag }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b22e762
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+/.idea
+/vendor
+
+mock_*_test.go
+wire_gen.go
diff --git a/.golangci.yml b/.golangci.yml
new file mode 100644
index 0000000..171816b
--- /dev/null
+++ b/.golangci.yml
@@ -0,0 +1,6 @@
+run:
+  timeout: 5m
+  tests: false
+  skip-dirs:
+    - vendor
+  modules-download-mode: vendor
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..d76c613
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,11 @@
+# This is the official list of Pinchy authors for copyright purposes.
+# This file is distinct from the CONTRIBUTORS files.
+# See the latter for an explanation.
+
+# Names should be added to this file as
+# Individual's name <submission email address>
+
+# Please keep the list sorted.
+Ageev Pavel <ageev.pavel.v@gmail.com>
+Artem Mezentsev <artyom.mezentzeff@gmail.com>
+
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
new file mode 100644
index 0000000..f1b2779
--- /dev/null
+++ b/CONTRIBUTORS
@@ -0,0 +1,9 @@
+# This is the official list of people who can contribute
+# (and typically have contributed) code to the Pinchy repository.
+# The AUTHORS file lists the copyright holders; this file
+# lists people.
+
+# Names should be added to this file like so:
+# Individual's name <submission email address>
+
+# Please keep the list sorted.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..04bf72d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      including but not limited to software source code, documentation
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+      subsequently incorporated within the Work.
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+      Work and such Derivative Works in Source or Object form.
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+   3. Grant of Patent License. Subject to the terms and conditions of
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
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+
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+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright 2020 Pavel Ageev <ageev.pavel.v@gmail.com>
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1f05388
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,123 @@
+override APP_NAME=pinchy
+override GO_VERSION=1.15
+override DOCKER_BUILDKIT=1
+
+GOOS?=$(shell go env GOOS || echo linux)
+GOARCH?=$(shell go env GOARCH || echo amd64)
+CGO_ENABLED?=0
+
+BUIlD_VERSION?=latest
+
+DOCKER_REGISTRY?=docker.pkg.github.com
+DOCKER_IMAGE?=${DOCKER_REGISTRY}/insidieux/pinchy/${APP_NAME}
+DOCKER_USER=
+DOCKER_PASSWORD=
+DOCKER_TAG?=latest
+
+ifeq (, $(shell which docker))
+$(error "Binary docker not found in $(PATH)")
+endif
+
+.PHONY: all
+all: cleanup vendor wire lint test build
+
+.PHONY: cleanup
+cleanup:
+	@rm ${PWD}/bin/${APP_NAME}* || true
+	@rm ${PWD}/tests/coverage.out || true
+	@find ${PWD} -type f -name "wire_gen.go" -delete
+	@find ${PWD} -type f -name "mock_*_test.go" -delete
+	@rm -r ${PWD}/vendor || true
+
+.PHONY: vendor
+vendor:
+	@rm -r ${PWD}/vendor || true
+	@docker run --rm -v ${PWD}:/project -w /project golang:${GO_VERSION} go mod tidy
+	@docker run --rm -v ${PWD}:/project -w /project golang:${GO_VERSION} go mod vendor
+
+.PHONY: wire
+wire:
+	@docker build \
+		--build-arg GO_VERSION=${GO_VERSION} \
+		-f ${PWD}/build/docker/utils/wire/Dockerfile \
+		-t wire:custom \
+			build/docker/utils/wire
+	@find ${PWD} -type f -name "wire_gen.go" -delete
+	@docker run --rm \
+		-v ${PWD}:/project \
+		-w /project \
+		wire:custom \
+			/project/...
+
+.PHONY: lint
+lint:
+	@docker run --rm \
+		-v ${PWD}:/project \
+		-w /project \
+		golangci/golangci-lint:v1.33.0 \
+			golangci-lint run -v
+
+.PHONY: test
+test:
+	@rm -r ${PWD}/test/coverage.out || true
+	@docker run --rm \
+		-v ${PWD}:/project \
+		-w /project \
+		golang:${GO_VERSION} \
+			go test \
+				-race \
+				-mod vendor \
+				-covermode=atomic \
+				-coverprofile=/project/test/coverage.out \
+					/project/...
+
+.PHONY: build
+build:
+	@rm ${PWD}/bin/${APP_NAME} || true
+	@docker run --rm \
+		-v ${PWD}:/project \
+		-w /project \
+		-e GOOS=${GOOS} \
+		-e GOARCH=${GOARCH} \
+		-e CGO_ENABLED=${CGO_ENABLED} \
+		-e GO111MODULE=on \
+		golang:${GO_VERSION} \
+			go build \
+				-mod vendor \
+				-ldflags "-X main.version=${BUIlD_VERSION}" \
+				-o /project/bin/${APP_NAME} \
+				-v /project/cmd/${APP_NAME}
+
+.PHONY: docker-image-build
+docker-image-build:
+	@docker rmi ${DOCKER_IMAGE}:${DOCKER_TAG} || true
+	@docker build \
+		-f ${PWD}/build/docker/cmd/pinchy/Dockerfile \
+		-t ${DOCKER_IMAGE}:${DOCKER_TAG} \
+			.
+
+.PHONY: docker-image-push
+docker-image-push:
+	@docker login -u ${DOCKER_USER} -p ${DOCKER_PASSWORD} ${DOCKER_REGISTRY}
+	@docker push ${DOCKER_IMAGE}:${DOCKER_TAG}
+
+
+.PHONY: mockery
+mockery:
+ifndef MOCKERY_SOURCE_DIR
+	$(error MOCKERY_SOURCE_DIR is not set)
+endif
+	@docker pull vektra/mockery:v2.4.0
+	@find ${PWD} -type f -name "mock_*_test.go" -delete
+	@docker run \
+		--rm \
+		-v ${PWD}:/project \
+		-w /project \
+		vektra/mockery:v2.4.0 \
+			--testonly \
+			--inpackage \
+			--all \
+			--dir /project/${MOCKERY_SOURCE_DIR} \
+			--output /project/${MOCKERY_SOURCE_DIR} \
+			--case snake \
+			--log-level trace
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..98f61fc
--- /dev/null
+++ b/README.md
@@ -0,0 +1,40 @@
+# Pinchy
+
+Service discovering and registry bridge.
+
+[![GitHub Workflow Status](https://img.shields.io/github/workflow/status/insidieux/pinchy/CI?style=flat-square)](https://github.com/insidieux/pinchy/actions?query=workflow%3ACI)
+[![Go Report Card](https://goreportcard.com/badge/github.com/insidieux/pinchy?style=flat-square)](https://goreportcard.com/report/github.com/insidieux/pinchy)
+[![codecov](https://codecov.io/gh/insidieux/pinchy/branch/master/graph/badge.svg?token=BI6HEMPLB1)](https://codecov.io/gh/insidieux/pinchy/branch/master)
+![GitHub go.mod Go version](https://img.shields.io/github/go-mod/go-version/insidieux/pinchy)
+
+Pinchy is a simple binary, which allows to automatically fetch services info from `Source` and register/remove them to/from `Registry`.
+
+Supported pluggable service sources:
+- [YAML File](https://ru.wikipedia.org/wiki/YAML)
+
+Supported pluggable service registries:
+- [Consul](http://www.consul.io/)
+
+## Installing
+
+Install Pinchy by running:
+
+```shell
+go get github.com/insidiuex/pinchy/cmd/pinchy
+```
+
+Ensure that `$GOPATH/bin` is added to your `$PATH`.
+
+## Documentation
+
+- [User guide][]
+- [Contributing guide][]
+
+[User guide]: ./docs/user-guide.md
+[Contributing guide]: ./docs/contributing-guide.md
+
+## License
+
+[Apache][]
+
+[Apache]: ./LICENSE
\ No newline at end of file
diff --git a/bin/.gitignore b/bin/.gitignore
new file mode 100644
index 0000000..d6b7ef3
--- /dev/null
+++ b/bin/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore
diff --git a/build/docker/cmd/pinchy/Dockerfile b/build/docker/cmd/pinchy/Dockerfile
new file mode 100644
index 0000000..ae8eb1b
--- /dev/null
+++ b/build/docker/cmd/pinchy/Dockerfile
@@ -0,0 +1,7 @@
+FROM alpine:3.12
+
+COPY bin/pinchy /usr/local/bin/pinchy
+
+RUN chmod +x /usr/local/bin/pinchy
+
+ENTRYPOINT ["pinchy"]
diff --git a/build/docker/utils/wire/Dockerfile b/build/docker/utils/wire/Dockerfile
new file mode 100644
index 0000000..f0488ca
--- /dev/null
+++ b/build/docker/utils/wire/Dockerfile
@@ -0,0 +1,6 @@
+ARG GO_VERSION=1.15
+FROM golang:${GO_VERSION}
+
+RUN go get -u -t github.com/google/wire/cmd/wire
+
+ENTRYPOINT ["/go/bin/wire"]
diff --git a/cmd/pinchy/internal/command.go b/cmd/pinchy/internal/command.go
new file mode 100644
index 0000000..7d35a55
--- /dev/null
+++ b/cmd/pinchy/internal/command.go
@@ -0,0 +1,76 @@
+package internal
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/insidieux/pinchy/internal/extension/registry"
+	"github.com/insidieux/pinchy/internal/extension/source"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+const (
+	name = `pinchy`
+)
+
+func NewCommand(version string) *cobra.Command {
+	rootCommand := &cobra.Command{
+		Use:     name,
+		Version: version,
+	}
+	rootCommand.SetOut(logrus.New().Out)
+
+	for _, sourceProvider := range source.GetProviderList() {
+		sourceCmd := &cobra.Command{
+			Use:   sourceProvider.Name(),
+			Short: fmt.Sprintf(`Fetch data from source "%s"`, sourceProvider.Name()),
+		}
+		for _, registryProvider := range registry.GetProviderList() {
+			registryCmd := &cobra.Command{
+				Use:   registryProvider.Name(),
+				Short: fmt.Sprintf(`Save data in registry "%s"`, registryProvider.Name()),
+			}
+			onceCommand := &cobra.Command{
+				Use:   `once`,
+				Short: `Run main process only once: sync and return result`,
+				RunE: func(cmd *cobra.Command, args []string) error {
+					manager, cleanup, err := newManager(cmd.Flags(), sourceProvider.Factory(), registryProvider.Factory())
+					if cleanup != nil {
+						cleanup()
+					}
+					if err != nil {
+						return errors.Wrap(err, `failed to bootstrap manager`)
+					}
+					return manager.Run(cmd.Context())
+				},
+			}
+			watchCommand := &cobra.Command{
+				Use:   `watch`,
+				Short: `Run main process as daemon: sync repeatedly with constant interval`,
+				RunE: func(cmd *cobra.Command, args []string) error {
+					sc, cleanup, err := newScheduler(cmd.Flags(), sourceProvider.Factory(), registryProvider.Factory())
+					if cleanup != nil {
+						cleanup()
+					}
+					if err != nil {
+						return errors.Wrap(err, `failed to bootstrap scheduler`)
+					}
+					sc.Run(cmd.Context())
+					return nil
+				},
+			}
+			watchCommand.Flags().Duration(`scheduler.interval`, time.Minute, `Interval between manager runs (1s, 1m, 5m, 1h and others)`)
+			registryCmd.PersistentFlags().Bool(`manager.continue-on-error`, false, `Omit errors during process manager`)
+			registryCmd.PersistentFlags().AddFlagSet(registryProvider.Flags())
+			registryCmd.AddCommand(onceCommand)
+			registryCmd.AddCommand(watchCommand)
+			sourceCmd.AddCommand(registryCmd)
+		}
+		sourceCmd.PersistentFlags().AddFlagSet(sourceProvider.Flags())
+		rootCommand.AddCommand(sourceCmd)
+	}
+	rootCommand.PersistentFlags().String(`logger.level`, logrus.InfoLevel.String(), `Log level`)
+	return rootCommand
+}
diff --git a/cmd/pinchy/internal/modules.go b/cmd/pinchy/internal/modules.go
new file mode 100644
index 0000000..2926435
--- /dev/null
+++ b/cmd/pinchy/internal/modules.go
@@ -0,0 +1,8 @@
+package internal
+
+import (
+	// List of imports for registry extensions
+	_ "github.com/insidieux/pinchy/internal/extension/registry/consul"
+	// List of imports for source extensions
+	_ "github.com/insidieux/pinchy/internal/extension/source/file"
+)
diff --git a/cmd/pinchy/internal/provider.go b/cmd/pinchy/internal/provider.go
new file mode 100644
index 0000000..e9e22e7
--- /dev/null
+++ b/cmd/pinchy/internal/provider.go
@@ -0,0 +1,77 @@
+package internal
+
+import (
+	"strings"
+	"time"
+
+	"github.com/insidieux/pinchy/internal/extension/registry"
+	"github.com/insidieux/pinchy/internal/extension/source"
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+// Provider for viper.Viper bound to current command pflag.FlagSet
+func provideViper(set *pflag.FlagSet) (*viper.Viper, error) {
+	v := viper.New()
+	v.SetEnvPrefix(strings.ToUpper(name))
+	v.SetEnvKeyReplacer(strings.NewReplacer("-", "_", ".", "_"))
+	v.AutomaticEnv()
+	if err := v.BindPFlags(set); err != nil {
+		return nil, errors.Wrap(err, `failed to bind command line arguments`)
+	}
+	return v, nil
+}
+
+// Provider for logrus.Level
+func provideLoggerLevel(commandViper *viper.Viper) (logrus.Level, error) {
+	level := commandViper.GetString(`logger.level`)
+	if level == `` {
+		level = logrus.InfoLevel.String()
+	}
+	return logrus.ParseLevel(level)
+}
+
+// Provider for logrus.FieldLogger
+func provideLogger(level logrus.Level) core.LoggerInterface {
+	logger := logrus.New()
+	logger.SetFormatter(&logrus.TextFormatter{})
+	logger.SetLevel(level)
+	return logger
+}
+
+// Provider for core.Registry
+func provideRegistry(commandViper *viper.Viper, factory registry.Factory, logger core.LoggerInterface) (core.Registry, func(), error) {
+	r, cleanup, err := factory(commandViper)
+	if r != nil {
+		lr, ok := r.(core.Loggable)
+		if ok {
+			lr.WithLogger(logger)
+		}
+	}
+	return r, cleanup, err
+}
+
+// Provider for core.Source
+func provideSource(commandViper *viper.Viper, factory source.Factory, logger core.LoggerInterface) (core.Source, func(), error) {
+	s, cleanup, err := factory(commandViper)
+	if s != nil {
+		ls, ok := s.(core.Loggable)
+		if ok {
+			ls.WithLogger(logger)
+		}
+	}
+	return s, cleanup, err
+}
+
+// Provider for core.Source
+func provideManagerExitOnError(commandViper *viper.Viper) core.ManagerExitOnError {
+	return core.ManagerExitOnError(commandViper.GetBool(`manager.continue-on-error`))
+}
+
+// Provider for time.Ticker
+func provideTicker(commandViper *viper.Viper) *time.Ticker {
+	return time.NewTicker(commandViper.GetDuration(`scheduler.interval`))
+}
diff --git a/cmd/pinchy/internal/wire.go b/cmd/pinchy/internal/wire.go
new file mode 100644
index 0000000..a4aeb24
--- /dev/null
+++ b/cmd/pinchy/internal/wire.go
@@ -0,0 +1,42 @@
+// +build wireinject
+
+package internal
+
+import (
+	"github.com/google/wire"
+	"github.com/insidieux/pinchy/internal/extension/registry"
+	"github.com/insidieux/pinchy/internal/extension/source"
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/spf13/pflag"
+)
+
+var (
+	managerWireSet = wire.NewSet(
+		provideViper,
+		wire.NewSet(
+			provideLoggerLevel,
+			provideLogger,
+		),
+		provideRegistry,
+		provideSource,
+		provideManagerExitOnError,
+		core.NewManager,
+	)
+	schedulerWireSet = wire.NewSet(
+		provideTicker,
+		managerWireSet,
+		core.NewScheduler,
+	)
+)
+
+func newManager(_ *pflag.FlagSet, _ source.Factory, _ registry.Factory) (core.ManagerInterface, func(), error) {
+	panic(wire.Build(
+		managerWireSet,
+	))
+}
+
+func newScheduler(_ *pflag.FlagSet, _ source.Factory, _ registry.Factory) (*core.Scheduler, func(), error) {
+	panic(wire.Build(
+		schedulerWireSet,
+	))
+}
diff --git a/cmd/pinchy/main.go b/cmd/pinchy/main.go
new file mode 100644
index 0000000..6d8a53e
--- /dev/null
+++ b/cmd/pinchy/main.go
@@ -0,0 +1,23 @@
+package main
+
+import (
+	"log"
+	"syscall"
+
+	"github.com/insidieux/pinchy/cmd/pinchy/internal"
+	"github.com/sethvargo/go-signalcontext"
+)
+
+var (
+	version string
+)
+
+func main() {
+	ctx, cancel := signalcontext.On(syscall.SIGINT, syscall.SIGTERM)
+	if cancel != nil {
+		defer cancel()
+	}
+	if err := internal.NewCommand(version).ExecuteContext(ctx); err != nil {
+		log.Fatalf(`Failed to execute command: %s`, err.Error())
+	}
+}
diff --git a/configs/source/file/example.yaml b/configs/source/file/example.yaml
new file mode 100644
index 0000000..04dbd31
--- /dev/null
+++ b/configs/source/file/example.yaml
@@ -0,0 +1,9 @@
+- name: service-name
+  address: 127.0.0.1
+  id: service-id
+  port: 80
+  tags:
+    - tag-1
+    - tag-2
+  meta:
+    key: value
diff --git a/deploy/docker-compose/consul/docker-compose.yml b/deploy/docker-compose/consul/docker-compose.yml
new file mode 100644
index 0000000..6dec514
--- /dev/null
+++ b/deploy/docker-compose/consul/docker-compose.yml
@@ -0,0 +1,29 @@
+version: '3'
+
+services:
+
+  consul-agent-1: &consul-agent
+    image: consul:latest
+    command: "agent -retry-join consul-server-bootstrap -client 0.0.0.0"
+
+  consul-agent-2:
+    <<: *consul-agent
+
+  consul-agent-3:
+    <<: *consul-agent
+
+  consul-server-1: &consul-server
+    <<: *consul-agent
+    command: "agent -server -retry-join consul-server-bootstrap -client 0.0.0.0"
+
+  consul-server-2:
+    <<: *consul-server
+
+  consul-server-bootstrap:
+    <<: *consul-agent
+    ports:
+      - "8400:8400"
+      - "8500:8500"
+      - "8600:8600"
+      - "8600:8600/udp"
+    command: "agent -server -bootstrap-expect 3 -ui -client 0.0.0.0"
diff --git a/docs/README.md b/docs/README.md
new file mode 100644
index 0000000..d51f878
--- /dev/null
+++ b/docs/README.md
@@ -0,0 +1,7 @@
+# Pinchy documentation
+
+- [User guide][]
+- [Contributing guide][]
+
+[User guide]: ./user-guide.md
+[Contributing guide]: ./contributing-guide.md
diff --git a/docs/contributing-guide.md b/docs/contributing-guide.md
new file mode 100644
index 0000000..1dd79af
--- /dev/null
+++ b/docs/contributing-guide.md
@@ -0,0 +1,22 @@
+# Contributing guide
+
+- Create an issue
+- Fork project
+- Create your feature branch (git checkout -b issue-id)
+- Commit your changes (git commit -am 'Add some feature')
+- Push to the branch (git push origin issue-id)
+- Create new Pull Request
+
+## Requirements
+
+- Every pull request code **must be** covered by tests
+- Every new source/registry **must be** documented at /docs
+
+## Adding new source/provider
+
+- Add new sub directory to `/pkg/core/{source,registry}`
+- Put your implementation of interface
+- Add new sub directory to `/internal/extension/{source,registry}`
+- Put wiring code for dynamic load implementations:
+  - Register implementation of `ProviderInterface` at `init` function
+  - Add anonymous import to `/cmd/pinchy/modules.go`
diff --git a/docs/registry/consul.md b/docs/registry/consul.md
new file mode 100644
index 0000000..070c159
--- /dev/null
+++ b/docs/registry/consul.md
@@ -0,0 +1,7 @@
+# Pinchy registry "Consul"
+
+## Available flags
+
+```
+--registry.address %full-http-url-to-consul-api%
+```
diff --git a/docs/source/file.md b/docs/source/file.md
new file mode 100644
index 0000000..21c48b8
--- /dev/null
+++ b/docs/source/file.md
@@ -0,0 +1,20 @@
+# Pinchy source "File"
+
+## Available flags
+
+```
+--source.path %full-path-to-yml-file%
+```
+
+## config.yml example
+
+```yaml
+- name: service-name
+  id: service-id
+  port: 80
+  tags:
+    - tag-1
+    - tag-2
+  meta:
+    key: value
+```
diff --git a/docs/user-guide.md b/docs/user-guide.md
new file mode 100644
index 0000000..a3750f1
--- /dev/null
+++ b/docs/user-guide.md
@@ -0,0 +1,64 @@
+# User guide
+
+## Installing
+
+### Github Release
+
+Visit the [releases page](https://github.com/insidieux/pinchy/releases/latest) to download one of the pre-built binaries for your platform.
+
+### Docker
+
+Use the [Docker image](https://hub.docker.com/repository/docker/insidieux/pinchy)
+
+```shell
+docker pull insidieux/pinchy
+```
+
+or 
+
+```shell
+echo PASSWORD_FILE | docker login docker.pkg.github.com --username USERNAME --password-stdin
+docker pull docker.pkg.github.com/insidieux/pinchy
+```
+
+### go get
+
+Alternatively, you can use the go get method:
+
+```shell
+go get github.com/insidiuex/pinchy/cmd/pinchy
+```
+
+Ensure that `$GOPATH/bin` is added to your `$PATH`.
+
+## Usage
+
+### Binary
+
+```shell
+pinchy ...
+```
+
+### Docker
+
+```shell
+docker run insidieux/pinchy
+```
+
+or
+
+```shell
+docker run docker.pkg.github.com/insidieux/pinchy/pinchy
+```
+
+### Available source types
+
+- [file]
+
+[file]: ./source/file.md
+
+### Available registry types
+
+- [consul]
+
+[consul]: ./registry/consul.md
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..924e056
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,25 @@
+module github.com/insidieux/pinchy
+
+go 1.15
+
+require (
+	github.com/agrea/ptr v0.0.0-20180711073057-77a518d99b7b
+	github.com/go-playground/validator/v10 v10.4.0
+	github.com/google/wire v0.4.0
+	github.com/hashicorp/consul/api v1.7.0
+	github.com/hashicorp/go-cleanhttp v0.5.1
+	github.com/pkg/errors v0.9.1
+	github.com/sethvargo/go-signalcontext v0.1.0
+	github.com/sirupsen/logrus v1.2.0
+	github.com/spf13/afero v1.2.2
+	github.com/spf13/cast v1.3.0
+	github.com/spf13/cobra v1.1.1
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.7.1
+	github.com/stretchr/testify v1.6.1
+	github.com/thoas/go-funk v0.7.0
+	golang.org/x/net v0.0.0-20200519113804-d87ec0cfa476 // indirect
+	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
+	gopkg.in/yaml.v2 v2.3.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..542338d
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,414 @@
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diff --git a/internal/extension/extension.go b/internal/extension/extension.go
new file mode 100644
index 0000000..18e7a55
--- /dev/null
+++ b/internal/extension/extension.go
@@ -0,0 +1,21 @@
+package extension
+
+import (
+	"strings"
+)
+
+type (
+	RegisterError []error
+)
+
+func (re RegisterError) String() string {
+	var slice []string
+	for _, err := range re {
+		slice = append(slice, err.Error())
+	}
+	return strings.Join(slice, `; `)
+}
+
+func (re RegisterError) Error() string {
+	return re.String()
+}
diff --git a/internal/extension/extension_test.go b/internal/extension/extension_test.go
new file mode 100644
index 0000000..5b01233
--- /dev/null
+++ b/internal/extension/extension_test.go
@@ -0,0 +1,58 @@
+package extension
+
+import (
+	"testing"
+
+	"github.com/pkg/errors"
+	"github.com/stretchr/testify/suite"
+)
+
+// --- Tests ---
+
+func TestRegisterError_String(t *testing.T) {
+	suite.Run(t, new(registerErrorStringTestSuite))
+}
+
+func TestRegisterError_Error(t *testing.T) {
+	suite.Run(t, new(registerErrorErrorTestSuite))
+}
+
+// --- Suites ---
+
+type registerErrorStringTestSuite struct {
+	suite.Suite
+	err RegisterError
+}
+
+func (s *registerErrorStringTestSuite) SetupTest() {
+	s.err = RegisterError{}
+}
+
+func (s *registerErrorStringTestSuite) TestEmptyError() {
+	s.Equal(``, s.err.String())
+}
+
+func (s *registerErrorStringTestSuite) TestNonEmptyError() {
+	s.err = append(s.err, errors.New(`expected error 1`))
+	s.err = append(s.err, errors.New(`expected error 2`))
+	s.Equal(`expected error 1; expected error 2`, s.err.String())
+}
+
+type registerErrorErrorTestSuite struct {
+	suite.Suite
+	err RegisterError
+}
+
+func (s *registerErrorErrorTestSuite) SetupTest() {
+	s.err = RegisterError{}
+}
+
+func (s *registerErrorErrorTestSuite) TestEmptyError() {
+	s.Equal(``, s.err.String())
+}
+
+func (s *registerErrorErrorTestSuite) TestNonEmptyError() {
+	s.err = append(s.err, errors.New(`expected error 1`))
+	s.err = append(s.err, errors.New(`expected error 2`))
+	s.Equal(`expected error 1; expected error 2`, s.err.Error())
+}
diff --git a/internal/extension/registry/consul/provider.go b/internal/extension/registry/consul/provider.go
new file mode 100644
index 0000000..df6f6b0
--- /dev/null
+++ b/internal/extension/registry/consul/provider.go
@@ -0,0 +1,63 @@
+package consul
+
+import (
+	"net/http"
+
+	pkgConsul "github.com/insidieux/pinchy/pkg/core/registry/consul"
+
+	"github.com/hashicorp/consul/api"
+	"github.com/insidieux/pinchy/internal/extension/registry"
+	"github.com/pkg/errors"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+const (
+	registryName = `consul`
+
+	flagConsulAddress = `address`
+)
+
+type (
+	client interface {
+		Agent() *api.Agent
+	}
+	factory func(*api.Config) (*api.Client, error)
+)
+
+func init() {
+	set := pflag.NewFlagSet(registryName, pflag.ExitOnError)
+	set.String(registry.MakeFlagName(flagConsulAddress), `127.0.0.1:8500`, `Consul http api address`)
+	if err := registry.Register(registryName, set, NewRegistry); err != nil {
+		panic(err)
+	}
+}
+
+func newClientConfig(v *viper.Viper, transport *http.Transport) (*api.Config, error) {
+	flag := registry.MakeFlagName(flagConsulAddress)
+	address := v.GetString(flag)
+	if address == `` {
+		return nil, errors.Errorf(`Flag "%s" is required`, flag)
+	}
+
+	cfg := api.DefaultConfig()
+	cfg.Address = address
+	cfg.Transport = transport
+	return cfg, nil
+}
+
+func provideConsulClientFactory() factory {
+	return api.NewClient
+}
+
+func newClient(cfg *api.Config, factory factory) (client, error) {
+	c, err := factory(cfg)
+	if err != nil {
+		return nil, errors.Wrap(err, `failed to create consul client`)
+	}
+	return c, nil
+}
+
+func newAgent(c client) pkgConsul.Agent {
+	return c.Agent()
+}
diff --git a/internal/extension/registry/consul/wire.go b/internal/extension/registry/consul/wire.go
new file mode 100644
index 0000000..ba2b6b8
--- /dev/null
+++ b/internal/extension/registry/consul/wire.go
@@ -0,0 +1,23 @@
+// +build wireinject
+
+package consul
+
+import (
+	"github.com/google/wire"
+	"github.com/hashicorp/go-cleanhttp"
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/insidieux/pinchy/pkg/core/registry/consul"
+	"github.com/spf13/viper"
+)
+
+func NewRegistry(*viper.Viper) (core.Registry, func(), error) {
+	panic(wire.Build(
+		cleanhttp.DefaultPooledTransport,
+		newClientConfig,
+		provideConsulClientFactory,
+		newClient,
+		newAgent,
+		consul.NewRegistry,
+		wire.Bind(new(core.Registry), new(*consul.Registry)),
+	))
+}
diff --git a/internal/extension/registry/extension.go b/internal/extension/registry/extension.go
new file mode 100644
index 0000000..5705e88
--- /dev/null
+++ b/internal/extension/registry/extension.go
@@ -0,0 +1,97 @@
+package registry
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/insidieux/pinchy/internal/extension"
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/pkg/errors"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+const (
+	flagPrefix = `registry`
+)
+
+type (
+	Factory           func(*viper.Viper) (core.Registry, func(), error)
+	ProviderInterface interface {
+		Name() string
+		Flags() *pflag.FlagSet
+		Factory() Factory
+	}
+	ProviderList []ProviderInterface
+	provider     struct {
+		name    string
+		flags   *pflag.FlagSet
+		factory Factory
+	}
+)
+
+var (
+	providerList = newProviderList()
+)
+
+func newProviderList() *ProviderList {
+	return new(ProviderList)
+}
+
+func GetProviderList() ProviderList {
+	return *providerList
+}
+
+func MakeFlagName(name string) string {
+	return fmt.Sprintf(`%s.%s`, flagPrefix, name)
+}
+
+func Register(name string, flags *pflag.FlagSet, factory Factory) error {
+	return providerList.register(&provider{
+		name:    name,
+		flags:   flags,
+		factory: factory,
+	})
+}
+
+func (p *provider) Name() string {
+	return p.name
+}
+
+func (p *provider) Flags() *pflag.FlagSet {
+	return p.flags
+}
+
+func (p *provider) Factory() Factory {
+	return p.factory
+}
+
+func (pl *ProviderList) register(p ProviderInterface) error {
+	if ep, _ := pl.Lookup(p.Name()); ep != nil {
+		return errors.Errorf(`registry provider with name "%s" has been already registered`, p.Name())
+	}
+	var err extension.RegisterError
+	p.Flags().VisitAll(func(flag *pflag.Flag) {
+		if !strings.HasPrefix(flag.Name, flagPrefix) {
+			err = append(err, errors.Errorf(`flag "%s" does not contain required prefix "%s"`, flag.Name, flagPrefix))
+		}
+	})
+	if err != nil {
+		return errors.Wrapf(err, `registry "%s" flags validation error`, p.Name())
+	}
+	*pl = append(*pl, p)
+	return nil
+}
+
+func (pl ProviderList) Lookup(name string) (ProviderInterface, error) {
+	for _, p := range pl {
+		if p.Name() == name {
+			return p, nil
+		}
+	}
+	return nil, errors.Errorf(`registry provider with name "%s" was not registered`, name)
+}
+
+func (pl ProviderList) Get() []ProviderInterface {
+	return pl
+}
diff --git a/internal/extension/registry/extension_test.go b/internal/extension/registry/extension_test.go
new file mode 100644
index 0000000..338e671
--- /dev/null
+++ b/internal/extension/registry/extension_test.go
@@ -0,0 +1,332 @@
+package registry
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/suite"
+)
+
+// --- Tests ---
+
+func Test_newProviderList(t *testing.T) {
+	suite.Run(t, new(newProviderListTestSuite))
+}
+
+func TestGetProviderList(t *testing.T) {
+	suite.Run(t, new(getProviderListTestSuite))
+}
+
+func TestMakeFlagName(t *testing.T) {
+	suite.Run(t, new(makeFlagNameTestSuite))
+}
+
+func TestProviderList_Get(t *testing.T) {
+	suite.Run(t, new(providerListGetTestSuite))
+}
+
+func TestProviderList_Lookup(t *testing.T) {
+	suite.Run(t, new(providerListLookupTestSuite))
+}
+
+func TestProviderList_register(t *testing.T) {
+	suite.Run(t, new(providerListRegisterTestSuite))
+}
+
+func TestProvider_Factory(t *testing.T) {
+	suite.Run(t, new(providerFactoryTestSuite))
+}
+
+func TestProvider_Flags(t *testing.T) {
+	suite.Run(t, new(providerFlagsTestSuite))
+}
+
+func TestProvider_Name(t *testing.T) {
+	suite.Run(t, new(providerNameTestSuite))
+}
+
+func TestRegister(t *testing.T) {
+	suite.Run(t, new(registerTestSuite))
+}
+
+// --- Suites ---
+
+type newProviderListTestSuite struct {
+	suite.Suite
+}
+
+func (s *newProviderListTestSuite) TestNewProviderList() {
+	got := newProviderList()
+	s.Equal(new(ProviderList), got)
+}
+
+type getProviderListTestSuite struct {
+	suite.Suite
+}
+
+func (s *newProviderListTestSuite) TestGetProviderList() {
+	got := GetProviderList()
+	s.Equal(*newProviderList(), got)
+}
+
+type makeFlagNameTestSuite struct {
+	suite.Suite
+}
+
+func (s *makeFlagNameTestSuite) TestMakeFlagName() {
+	s.Equal(fmt.Sprintf(`%s.%s`, flagPrefix, `flag`), MakeFlagName(`flag`))
+}
+
+type providerListGetTestSuite struct {
+	suite.Suite
+}
+
+func (s *providerListGetTestSuite) TestGet() {
+	s.Equal(*new([]ProviderInterface), newProviderList().Get())
+}
+
+type providerListLookupTestSuite struct {
+	suite.Suite
+	list *ProviderList
+}
+
+func (s *providerListLookupTestSuite) SetupTest() {
+	s.list = newProviderList()
+}
+
+func (s *providerListLookupTestSuite) TestErrorProviderWasNotRegistered() {
+	provider, err := s.list.Lookup(`provider`)
+	s.Nil(provider)
+	s.Error(err)
+	s.EqualError(err, `registry provider with name "provider" was not registered`)
+}
+
+func (s *providerListLookupTestSuite) TestSuccess() {
+	registeredProvider := new(MockProviderInterface)
+	registeredProvider.On(`Name`).Return(`provider`)
+	*s.list = append(*s.list, registeredProvider)
+
+	provider, err := s.list.Lookup(`provider`)
+	s.NoError(err)
+	s.NotNil(provider)
+	s.Equal(registeredProvider, provider)
+}
+
+type providerListRegisterTestSuite struct {
+	suite.Suite
+	list     *ProviderList
+	provider *MockProviderInterface
+}
+
+func (s *providerListRegisterTestSuite) SetupTest() {
+	s.list = newProviderList()
+	s.provider = new(MockProviderInterface)
+	s.provider.On(`Name`).Return(`provider`)
+}
+
+func (s *providerListRegisterTestSuite) TestErrorProviderHasBeenRegistered() {
+	beforeRegisterProvider := new(MockProviderInterface)
+	beforeRegisterProvider.On(`Name`).Return(`provider`)
+	*s.list = append(*s.list, beforeRegisterProvider)
+
+	err := s.list.register(s.provider)
+	s.Error(err)
+	s.EqualError(err, `registry provider with name "provider" has been already registered`)
+}
+
+func (s *providerListRegisterTestSuite) TestErrorProviderHasFlagsWithoutRequiredPrefix() {
+	flags := pflag.NewFlagSet(`provider`, pflag.ExitOnError)
+	flags.String(`wrong.flag`, `value`, `usage`)
+	s.provider.On(`Flags`).Return(flags)
+
+	err := s.list.register(s.provider)
+	s.Error(err)
+	s.EqualError(
+		err,
+		fmt.Sprintf(
+			`registry "%s" flags validation error: flag "%s" does not contain required prefix "%s"`,
+			`provider`,
+			`wrong.flag`,
+			flagPrefix,
+		),
+	)
+}
+
+func (s *providerListRegisterTestSuite) TestSuccess() {
+	flags := pflag.NewFlagSet(`provider`, pflag.ExitOnError)
+	flags.String(`registry.flag`, `value`, `usage`)
+	s.provider.On(`Flags`).Return(flags)
+
+	err := s.list.register(s.provider)
+	s.NoError(err)
+}
+
+type providerFactoryTestSuite struct {
+	suite.Suite
+}
+
+func (s *providerFactoryTestSuite) TestSuccess() {
+	factory := new(MockFactory)
+	p := &provider{
+		factory: factory.Execute,
+	}
+	s.IsType(*new(Factory), p.Factory())
+}
+
+type providerFlagsTestSuite struct {
+	suite.Suite
+}
+
+func (s *providerFlagsTestSuite) TestSuccess() {
+	p := &provider{
+		flags: pflag.CommandLine,
+	}
+	s.Equal(pflag.CommandLine, p.Flags())
+}
+
+type providerNameTestSuite struct {
+	suite.Suite
+}
+
+func (s *providerNameTestSuite) TestSuccess() {
+	p := &provider{
+		name: `name`,
+	}
+	s.Equal(`name`, p.Name())
+}
+
+type registerTestSuite struct {
+	suite.Suite
+	provider *MockProviderInterface
+}
+
+func (s *registerTestSuite) SetupTest() {
+	providerList = newProviderList()
+}
+
+func (s *registerTestSuite) TestErrorProviderHasBeenRegistered() {
+	*providerList = append(*providerList, &provider{name: `provider`})
+
+	err := Register(`provider`, nil, nil)
+	s.Error(err)
+	s.EqualError(err, `registry provider with name "provider" has been already registered`)
+}
+
+func (s *registerTestSuite) TestErrorProviderHasFlagsWithoutRequiredPrefix() {
+	flags := pflag.NewFlagSet(`provider`, pflag.ExitOnError)
+	flags.String(`wrong.flag`, `value`, `usage`)
+
+	err := Register(`provider`, flags, nil)
+	s.Error(err)
+	s.EqualError(
+		err,
+		fmt.Sprintf(
+			`registry "%s" flags validation error: flag "%s" does not contain required prefix "%s"`,
+			`provider`,
+			`wrong.flag`,
+			flagPrefix,
+		),
+	)
+}
+
+func (s *registerTestSuite) TestSuccess() {
+	flags := pflag.NewFlagSet(`provider`, pflag.ExitOnError)
+	flags.String(`registry.flag`, `value`, `usage`)
+
+	err := Register(`provider`, flags, nil)
+	s.NoError(err)
+}
+
+// --- Mocks ---
+
+// MockProviderInterface is an autogenerated mock type for the ProviderInterface type
+type MockProviderInterface struct {
+	mock.Mock
+}
+
+// Factory provides a mock function with given fields:
+func (_m *MockProviderInterface) Factory() Factory {
+	ret := _m.Called()
+
+	var r0 Factory
+	if rf, ok := ret.Get(0).(func() Factory); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(Factory)
+		}
+	}
+
+	return r0
+}
+
+// Flags provides a mock function with given fields:
+func (_m *MockProviderInterface) Flags() *pflag.FlagSet {
+	ret := _m.Called()
+
+	var r0 *pflag.FlagSet
+	if rf, ok := ret.Get(0).(func() *pflag.FlagSet); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*pflag.FlagSet)
+		}
+	}
+
+	return r0
+}
+
+// Name provides a mock function with given fields:
+func (_m *MockProviderInterface) Name() string {
+	ret := _m.Called()
+
+	var r0 string
+	if rf, ok := ret.Get(0).(func() string); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(string)
+	}
+
+	return r0
+}
+
+// MockFactory is an autogenerated mock type for the Factory type
+type MockFactory struct {
+	mock.Mock
+}
+
+// Execute provides a mock function with given fields: _a0
+func (_m *MockFactory) Execute(_a0 *viper.Viper) (core.Registry, func(), error) {
+	ret := _m.Called(_a0)
+
+	var r0 core.Registry
+	if rf, ok := ret.Get(0).(func(*viper.Viper) core.Registry); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(core.Registry)
+		}
+	}
+
+	var r1 func()
+	if rf, ok := ret.Get(1).(func(*viper.Viper) func()); ok {
+		r1 = rf(_a0)
+	} else {
+		if ret.Get(1) != nil {
+			r1 = ret.Get(1).(func())
+		}
+	}
+
+	var r2 error
+	if rf, ok := ret.Get(2).(func(*viper.Viper) error); ok {
+		r2 = rf(_a0)
+	} else {
+		r2 = ret.Error(2)
+	}
+
+	return r0, r1, r2
+}
diff --git a/internal/extension/source/extension.go b/internal/extension/source/extension.go
new file mode 100644
index 0000000..0c6224f
--- /dev/null
+++ b/internal/extension/source/extension.go
@@ -0,0 +1,97 @@
+package source
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/insidieux/pinchy/internal/extension"
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/pkg/errors"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+const (
+	flagPrefix = `source`
+)
+
+type (
+	Factory           func(*viper.Viper) (core.Source, func(), error)
+	ProviderInterface interface {
+		Name() string
+		Flags() *pflag.FlagSet
+		Factory() Factory
+	}
+	ProviderList []ProviderInterface
+	provider     struct {
+		name    string
+		flags   *pflag.FlagSet
+		factory Factory
+	}
+)
+
+var (
+	providerList = newProviderList()
+)
+
+func newProviderList() *ProviderList {
+	return new(ProviderList)
+}
+
+func GetProviderList() ProviderList {
+	return *providerList
+}
+
+func MakeFlagName(name string) string {
+	return fmt.Sprintf(`%s.%s`, flagPrefix, name)
+}
+
+func Register(name string, flags *pflag.FlagSet, factory Factory) error {
+	return providerList.register(&provider{
+		name:    name,
+		flags:   flags,
+		factory: factory,
+	})
+}
+
+func (p *provider) Name() string {
+	return p.name
+}
+
+func (p *provider) Flags() *pflag.FlagSet {
+	return p.flags
+}
+
+func (p *provider) Factory() Factory {
+	return p.factory
+}
+
+func (pl *ProviderList) register(p ProviderInterface) error {
+	if ep, _ := pl.Lookup(p.Name()); ep != nil {
+		return errors.Errorf(`source provider with name "%s" has been already registered`, p.Name())
+	}
+	var err extension.RegisterError
+	p.Flags().VisitAll(func(flag *pflag.Flag) {
+		if !strings.HasPrefix(flag.Name, flagPrefix) {
+			err = append(err, errors.Errorf(`flag "%s" does not contain required prefix "%s"`, flag.Name, flagPrefix))
+		}
+	})
+	if err != nil {
+		return errors.Wrapf(err, `source "%s" flags validation error`, p.Name())
+	}
+	*pl = append(*pl, p)
+	return nil
+}
+
+func (pl ProviderList) Lookup(name string) (ProviderInterface, error) {
+	for _, p := range pl {
+		if p.Name() == name {
+			return p, nil
+		}
+	}
+	return nil, errors.Errorf(`source provider with name "%s" was not registered`, name)
+}
+
+func (pl ProviderList) Get() []ProviderInterface {
+	return pl
+}
diff --git a/internal/extension/source/extension_test.go b/internal/extension/source/extension_test.go
new file mode 100644
index 0000000..1140ec4
--- /dev/null
+++ b/internal/extension/source/extension_test.go
@@ -0,0 +1,332 @@
+package source
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/suite"
+)
+
+// --- Tests ---
+
+func Test_newProviderList(t *testing.T) {
+	suite.Run(t, new(newProviderListTestSuite))
+}
+
+func TestGetProviderList(t *testing.T) {
+	suite.Run(t, new(getProviderListTestSuite))
+}
+
+func TestMakeFlagName(t *testing.T) {
+	suite.Run(t, new(makeFlagNameTestSuite))
+}
+
+func TestProviderList_Get(t *testing.T) {
+	suite.Run(t, new(providerListGetTestSuite))
+}
+
+func TestProviderList_Lookup(t *testing.T) {
+	suite.Run(t, new(providerListLookupTestSuite))
+}
+
+func TestProviderList_register(t *testing.T) {
+	suite.Run(t, new(providerListRegisterTestSuite))
+}
+
+func TestProvider_Factory(t *testing.T) {
+	suite.Run(t, new(providerFactoryTestSuite))
+}
+
+func TestProvider_Flags(t *testing.T) {
+	suite.Run(t, new(providerFlagsTestSuite))
+}
+
+func TestProvider_Name(t *testing.T) {
+	suite.Run(t, new(providerNameTestSuite))
+}
+
+func TestRegister(t *testing.T) {
+	suite.Run(t, new(registerTestSuite))
+}
+
+// --- Suites ---
+
+type newProviderListTestSuite struct {
+	suite.Suite
+}
+
+func (s *newProviderListTestSuite) TestNewProviderList() {
+	got := newProviderList()
+	s.Equal(new(ProviderList), got)
+}
+
+type getProviderListTestSuite struct {
+	suite.Suite
+}
+
+func (s *newProviderListTestSuite) TestGetProviderList() {
+	got := GetProviderList()
+	s.Equal(*newProviderList(), got)
+}
+
+type makeFlagNameTestSuite struct {
+	suite.Suite
+}
+
+func (s *makeFlagNameTestSuite) TestMakeFlagName() {
+	s.Equal(fmt.Sprintf(`%s.%s`, flagPrefix, `flag`), MakeFlagName(`flag`))
+}
+
+type providerListGetTestSuite struct {
+	suite.Suite
+}
+
+func (s *providerListGetTestSuite) TestGet() {
+	s.Equal(*new([]ProviderInterface), newProviderList().Get())
+}
+
+type providerListLookupTestSuite struct {
+	suite.Suite
+	list *ProviderList
+}
+
+func (s *providerListLookupTestSuite) SetupTest() {
+	s.list = newProviderList()
+}
+
+func (s *providerListLookupTestSuite) TestErrorProviderWasNotRegistered() {
+	provider, err := s.list.Lookup(`provider`)
+	s.Nil(provider)
+	s.Error(err)
+	s.EqualError(err, `source provider with name "provider" was not registered`)
+}
+
+func (s *providerListLookupTestSuite) TestSuccess() {
+	registeredProvider := new(MockProviderInterface)
+	registeredProvider.On(`Name`).Return(`provider`)
+	*s.list = append(*s.list, registeredProvider)
+
+	provider, err := s.list.Lookup(`provider`)
+	s.NoError(err)
+	s.NotNil(provider)
+	s.Equal(registeredProvider, provider)
+}
+
+type providerListRegisterTestSuite struct {
+	suite.Suite
+	list     *ProviderList
+	provider *MockProviderInterface
+}
+
+func (s *providerListRegisterTestSuite) SetupTest() {
+	s.list = newProviderList()
+	s.provider = new(MockProviderInterface)
+	s.provider.On(`Name`).Return(`provider`)
+}
+
+func (s *providerListRegisterTestSuite) TestErrorProviderHasBeenRegistered() {
+	beforeRegisterProvider := new(MockProviderInterface)
+	beforeRegisterProvider.On(`Name`).Return(`provider`)
+	*s.list = append(*s.list, beforeRegisterProvider)
+
+	err := s.list.register(s.provider)
+	s.Error(err)
+	s.EqualError(err, `source provider with name "provider" has been already registered`)
+}
+
+func (s *providerListRegisterTestSuite) TestErrorProviderHasFlagsWithoutRequiredPrefix() {
+	flags := pflag.NewFlagSet(`provider`, pflag.ExitOnError)
+	flags.String(`wrong.flag`, `value`, `usage`)
+	s.provider.On(`Flags`).Return(flags)
+
+	err := s.list.register(s.provider)
+	s.Error(err)
+	s.EqualError(
+		err,
+		fmt.Sprintf(
+			`source "%s" flags validation error: flag "%s" does not contain required prefix "%s"`,
+			`provider`,
+			`wrong.flag`,
+			flagPrefix,
+		),
+	)
+}
+
+func (s *providerListRegisterTestSuite) TestSuccess() {
+	flags := pflag.NewFlagSet(`provider`, pflag.ExitOnError)
+	flags.String(`source.flag`, `value`, `usage`)
+	s.provider.On(`Flags`).Return(flags)
+
+	err := s.list.register(s.provider)
+	s.NoError(err)
+}
+
+type providerFactoryTestSuite struct {
+	suite.Suite
+}
+
+func (s *providerFactoryTestSuite) TestSuccess() {
+	factory := new(MockFactory)
+	p := &provider{
+		factory: factory.Execute,
+	}
+	s.IsType(*new(Factory), p.Factory())
+}
+
+type providerFlagsTestSuite struct {
+	suite.Suite
+}
+
+func (s *providerFlagsTestSuite) TestSuccess() {
+	p := &provider{
+		flags: pflag.CommandLine,
+	}
+	s.Equal(pflag.CommandLine, p.Flags())
+}
+
+type providerNameTestSuite struct {
+	suite.Suite
+}
+
+func (s *providerNameTestSuite) TestSuccess() {
+	p := &provider{
+		name: `name`,
+	}
+	s.Equal(`name`, p.Name())
+}
+
+type registerTestSuite struct {
+	suite.Suite
+	provider *MockProviderInterface
+}
+
+func (s *registerTestSuite) SetupTest() {
+	providerList = newProviderList()
+}
+
+func (s *registerTestSuite) TestErrorProviderHasBeenRegistered() {
+	*providerList = append(*providerList, &provider{name: `provider`})
+
+	err := Register(`provider`, nil, nil)
+	s.Error(err)
+	s.EqualError(err, `source provider with name "provider" has been already registered`)
+}
+
+func (s *registerTestSuite) TestErrorProviderHasFlagsWithoutRequiredPrefix() {
+	flags := pflag.NewFlagSet(`provider`, pflag.ExitOnError)
+	flags.String(`wrong.flag`, `value`, `usage`)
+
+	err := Register(`provider`, flags, nil)
+	s.Error(err)
+	s.EqualError(
+		err,
+		fmt.Sprintf(
+			`source "%s" flags validation error: flag "%s" does not contain required prefix "%s"`,
+			`provider`,
+			`wrong.flag`,
+			flagPrefix,
+		),
+	)
+}
+
+func (s *registerTestSuite) TestSuccess() {
+	flags := pflag.NewFlagSet(`provider`, pflag.ExitOnError)
+	flags.String(`source.flag`, `value`, `usage`)
+
+	err := Register(`provider`, flags, nil)
+	s.NoError(err)
+}
+
+// --- Mocks ---
+
+// MockProviderInterface is an autogenerated mock type for the ProviderInterface type
+type MockProviderInterface struct {
+	mock.Mock
+}
+
+// Factory provides a mock function with given fields:
+func (_m *MockProviderInterface) Factory() Factory {
+	ret := _m.Called()
+
+	var r0 Factory
+	if rf, ok := ret.Get(0).(func() Factory); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(Factory)
+		}
+	}
+
+	return r0
+}
+
+// Flags provides a mock function with given fields:
+func (_m *MockProviderInterface) Flags() *pflag.FlagSet {
+	ret := _m.Called()
+
+	var r0 *pflag.FlagSet
+	if rf, ok := ret.Get(0).(func() *pflag.FlagSet); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*pflag.FlagSet)
+		}
+	}
+
+	return r0
+}
+
+// Name provides a mock function with given fields:
+func (_m *MockProviderInterface) Name() string {
+	ret := _m.Called()
+
+	var r0 string
+	if rf, ok := ret.Get(0).(func() string); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(string)
+	}
+
+	return r0
+}
+
+// MockFactory is an autogenerated mock type for the Factory type
+type MockFactory struct {
+	mock.Mock
+}
+
+// Execute provides a mock function with given fields: _a0
+func (_m *MockFactory) Execute(_a0 *viper.Viper) (core.Source, func(), error) {
+	ret := _m.Called(_a0)
+
+	var r0 core.Source
+	if rf, ok := ret.Get(0).(func(*viper.Viper) core.Source); ok {
+		r0 = rf(_a0)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(core.Source)
+		}
+	}
+
+	var r1 func()
+	if rf, ok := ret.Get(1).(func(*viper.Viper) func()); ok {
+		r1 = rf(_a0)
+	} else {
+		if ret.Get(1) != nil {
+			r1 = ret.Get(1).(func())
+		}
+	}
+
+	var r2 error
+	if rf, ok := ret.Get(2).(func(*viper.Viper) error); ok {
+		r2 = rf(_a0)
+	} else {
+		r2 = ret.Error(2)
+	}
+
+	return r0, r1, r2
+}
diff --git a/internal/extension/source/file/provider.go b/internal/extension/source/file/provider.go
new file mode 100644
index 0000000..f78e05d
--- /dev/null
+++ b/internal/extension/source/file/provider.go
@@ -0,0 +1,41 @@
+package file
+
+import (
+	pkgFile "github.com/insidieux/pinchy/pkg/core/source/file"
+
+	"github.com/insidieux/pinchy/internal/extension/source"
+	"github.com/pkg/errors"
+	"github.com/spf13/afero"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+const (
+	sourceName = `file`
+
+	flagFilePath = `path`
+)
+
+func init() {
+	set := pflag.NewFlagSet(sourceName, pflag.ExitOnError)
+	set.String(source.MakeFlagName(flagFilePath), `$HOME/services.yml`, `services.yml config path`)
+
+	if err := source.Register(sourceName, set, NewSource); err != nil {
+		panic(err)
+	}
+}
+
+func newReader() afero.Afero {
+	return afero.Afero{
+		Fs: afero.NewReadOnlyFs(afero.NewOsFs()),
+	}
+}
+
+func newPath(v *viper.Viper) (pkgFile.Path, error) {
+	flag := source.MakeFlagName(flagFilePath)
+	path := v.GetString(flag)
+	if path == `` {
+		return ``, errors.Errorf(`flag "%s" is required`, flag)
+	}
+	return pkgFile.Path(path), nil
+}
diff --git a/internal/extension/source/file/wire.go b/internal/extension/source/file/wire.go
new file mode 100644
index 0000000..b05322f
--- /dev/null
+++ b/internal/extension/source/file/wire.go
@@ -0,0 +1,22 @@
+// +build wireinject
+
+package file
+
+import (
+	pkgFile "github.com/insidieux/pinchy/pkg/core/source/file"
+
+	"github.com/google/wire"
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/spf13/afero"
+	"github.com/spf13/viper"
+)
+
+func NewSource(*viper.Viper) (core.Source, func(), error) {
+	panic(wire.Build(
+		newReader,
+		wire.Bind(new(pkgFile.Reader), new(afero.Afero)),
+		newPath,
+		pkgFile.NewSource,
+		wire.Bind(new(core.Source), new(*pkgFile.Source)),
+	))
+}
diff --git a/pkg/core/logger.go b/pkg/core/logger.go
new file mode 100644
index 0000000..064f925
--- /dev/null
+++ b/pkg/core/logger.go
@@ -0,0 +1,35 @@
+package core
+
+type (
+	LoggerInterface interface {
+		Debugf(format string, args ...interface{})
+		Infof(format string, args ...interface{})
+		Printf(format string, args ...interface{})
+		Warnf(format string, args ...interface{})
+		Warningf(format string, args ...interface{})
+		Errorf(format string, args ...interface{})
+		Fatalf(format string, args ...interface{})
+		Panicf(format string, args ...interface{})
+
+		Debug(args ...interface{})
+		Info(args ...interface{})
+		Print(args ...interface{})
+		Warn(args ...interface{})
+		Warning(args ...interface{})
+		Error(args ...interface{})
+		Fatal(args ...interface{})
+		Panic(args ...interface{})
+
+		Debugln(args ...interface{})
+		Infoln(args ...interface{})
+		Println(args ...interface{})
+		Warnln(args ...interface{})
+		Warningln(args ...interface{})
+		Errorln(args ...interface{})
+		Fatalln(args ...interface{})
+		Panicln(args ...interface{})
+	}
+	Loggable interface {
+		WithLogger(LoggerInterface)
+	}
+)
diff --git a/pkg/core/manager.go b/pkg/core/manager.go
new file mode 100644
index 0000000..f35cec4
--- /dev/null
+++ b/pkg/core/manager.go
@@ -0,0 +1,123 @@
+package core
+
+import (
+	"context"
+	"strings"
+
+	"github.com/pkg/errors"
+	"github.com/spf13/cast"
+	"github.com/thoas/go-funk"
+)
+
+type (
+	ManagerInterface interface {
+		Run(ctx context.Context) error
+	}
+	Manager struct {
+		source      Source
+		registry    Registry
+		logger      LoggerInterface
+		exitOnError ManagerExitOnError
+	}
+	ManagerExitOnError bool
+	managerError       []error
+)
+
+func NewManager(source Source, registry Registry, logger LoggerInterface, exitOnError ManagerExitOnError) ManagerInterface {
+	return &Manager{
+		source:      source,
+		registry:    registry,
+		logger:      logger,
+		exitOnError: exitOnError,
+	}
+}
+
+func (m *Manager) Run(ctx context.Context) error {
+	incoming, err := m.source.Fetch(ctx)
+	if err != nil {
+		return errors.Wrap(err, `failed to fetch services from source`)
+	}
+
+	registered, err := m.registry.Fetch(ctx)
+	if err != nil {
+		return errors.Wrap(err, `failed to fetch services from registry`)
+	}
+
+	orphan := m.findOrphan(incoming, registered)
+	if len(orphan) > 0 {
+		if err := m.deregisterServices(ctx, orphan); err != nil {
+			err := errors.Wrap(err, `failed to deregister services`)
+			m.logger.Error(err.Error())
+			if m.exitOnError {
+				return err
+			}
+		}
+	}
+	if err := m.registerServices(ctx, incoming); err != nil {
+		err := errors.Wrap(err, `failed to register services`)
+		m.logger.Error(err.Error())
+		if m.exitOnError {
+			return err
+		}
+	}
+	return nil
+}
+
+func (m *Manager) findOrphan(incoming Services, registered Services) Services {
+	_, right := funk.Difference(incoming.IDs(), registered.IDs())
+	orphan := make(Services, 0)
+	for _, id := range cast.ToStringSlice(right) {
+		if service := registered.Lookup(id); service != nil {
+			orphan = append(orphan, service)
+		}
+	}
+	return orphan
+}
+
+func (m *Manager) deregisterServices(ctx context.Context, services Services) error {
+	me := new(managerError)
+	for _, service := range services {
+		if err := m.registry.Deregister(ctx, service.RegistrationID()); err != nil {
+			me.Add(errors.Wrapf(err, `failed to deregister service "%s" from registry`, service.RegistrationID()))
+			continue
+		}
+	}
+	if me.HasErrors() {
+		return me
+	}
+	return nil
+}
+
+func (m *Manager) registerServices(ctx context.Context, services Services) error {
+	me := new(managerError)
+	for _, service := range services {
+		if err := m.registry.Register(ctx, service); err != nil {
+			me.Add(errors.Wrapf(err, `failed to register service "%s" in registry`, service.RegistrationID()))
+			continue
+		}
+	}
+	if me.HasErrors() {
+		return me
+	}
+	return nil
+}
+
+func (e *managerError) Add(err error) {
+	*e = append(*e, err)
+}
+
+func (e *managerError) HasErrors() bool {
+	return len(*e) > 0
+}
+
+func (e *managerError) String() string {
+	var slice []string
+	for _, err := range *e {
+		slice = append(slice, err.Error())
+	}
+	return strings.Join(slice, `; `)
+}
+
+func (e *managerError) Error() string {
+	return e.String()
+}
diff --git a/pkg/core/manager_test.go b/pkg/core/manager_test.go
new file mode 100644
index 0000000..7e149dc
--- /dev/null
+++ b/pkg/core/manager_test.go
@@ -0,0 +1,282 @@
+package core
+
+import (
+	"context"
+	"testing"
+
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus/hooks/test"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/suite"
+)
+
+// --- Tests ---
+
+func TestNewManager(t *testing.T) {
+	suite.Run(t, new(newManagerTestSuite))
+}
+
+func TestManager_Run(t *testing.T) {
+	suite.Run(t, new(managerRunTestSuite))
+}
+
+func TestManagerError_Add(t *testing.T) {
+	suite.Run(t, new(managerErrorAddTestSuite))
+}
+
+func TestManagerError_String(t *testing.T) {
+	suite.Run(t, new(managerErrorStringTestSuite))
+}
+
+func TestManagerError_Error(t *testing.T) {
+	suite.Run(t, new(managerErrorErrorTestSuite))
+}
+
+func TestManagerError_HasErrors(t *testing.T) {
+	suite.Run(t, new(managerErrorHasErrorsTestSuite))
+}
+
+// --- Suites ---
+
+type newManagerTestSuite struct {
+	suite.Suite
+}
+
+func (s *newManagerTestSuite) TestNewManager() {
+	s.Equal(
+		&Manager{nil, nil, nil, true},
+		NewManager(nil, nil, nil, true),
+	)
+}
+
+type managerRunTestSuite struct {
+	suite.Suite
+	manager *Manager
+}
+
+func (s *managerRunTestSuite) SetupTest() {
+	s.manager = new(Manager)
+}
+
+func (s *managerRunTestSuite) TestErrorFetchFromSource() {
+	ctx := context.Background()
+	sourceMock := new(MockSource)
+	sourceMock.On(`Fetch`, ctx).Return(nil, errors.New(`expected error`))
+
+	s.manager.source = sourceMock
+	err := s.manager.Run(ctx)
+	s.Error(err)
+	s.EqualError(err, `failed to fetch services from source: expected error`)
+}
+
+func (s *managerRunTestSuite) TestErrorFetchFromRegistry() {
+	ctx := context.Background()
+	sourceMock := new(MockSource)
+	sourceMock.On(`Fetch`, ctx).Return(Services{}, nil)
+	registryMock := new(MockRegistry)
+	registryMock.On(`Fetch`, ctx).Return(nil, errors.New(`expected error`))
+
+	s.manager.source = sourceMock
+	s.manager.registry = registryMock
+
+	err := s.manager.Run(ctx)
+	s.Error(err)
+	s.EqualError(err, `failed to fetch services from registry: expected error`)
+}
+
+func (s *managerRunTestSuite) TestErrorDeregisterOrphan() {
+	ctx := context.Background()
+	sourceMock := new(MockSource)
+	sourceMock.On(`Fetch`, ctx).Return(Services{{Name: `service-1`}}, nil)
+	registryMock := new(MockRegistry)
+	registryMock.On(`Fetch`, ctx).Return(Services{{Name: `service-2`}}, nil)
+	registryMock.On(`Deregister`, ctx, `service-2`).Return(errors.New(`expected error`))
+	logger, _ := test.NewNullLogger()
+
+	s.manager.source = sourceMock
+	s.manager.registry = registryMock
+	s.manager.logger = logger
+	s.manager.exitOnError = true
+
+	err := s.manager.Run(ctx)
+	s.Error(err)
+	s.EqualError(err, `failed to deregister services: failed to deregister service "service-2" from registry: expected error`)
+}
+
+func (s *managerRunTestSuite) TestErrorRegister() {
+	ctx := context.Background()
+	service := &Service{Name: `service-1`}
+	sourceMock := new(MockSource)
+	sourceMock.On(`Fetch`, ctx).Return(Services{service}, nil)
+	registryMock := new(MockRegistry)
+	registryMock.On(`Fetch`, ctx).Return(Services{}, nil)
+	registryMock.On(`Register`, ctx, service).Return(errors.New(`expected error`))
+	logger, _ := test.NewNullLogger()
+
+	s.manager.source = sourceMock
+	s.manager.registry = registryMock
+	s.manager.logger = logger
+	s.manager.exitOnError = true
+
+	err := s.manager.Run(ctx)
+	s.Error(err)
+	s.EqualError(err, `failed to register services: failed to register service "service-1" in registry: expected error`)
+}
+
+func (s *managerRunTestSuite) TestSuccess() {
+	ctx := context.Background()
+	sourceMock := new(MockSource)
+	sourceMock.On(`Fetch`, ctx).Return(Services{{Name: `service-1`}}, nil)
+	registryMock := new(MockRegistry)
+	registryMock.On(`Fetch`, ctx).Return(Services{{Name: `service-2`}}, nil)
+	registryMock.On(`Deregister`, ctx, `service-2`).Return(nil)
+	registryMock.On(`Register`, ctx, mock.Anything).Return(nil)
+
+	s.manager.source = sourceMock
+	s.manager.registry = registryMock
+	s.NoError(s.manager.Run(ctx))
+}
+
+type managerErrorAddTestSuite struct {
+	suite.Suite
+	err managerError
+}
+
+func (s *managerErrorAddTestSuite) TestAdd() {
+	s.err = append(s.err, errors.New(`expected error`))
+	s.Len(s.err, 1)
+	s.Equal(`expected error`, s.err[0].Error())
+}
+
+type managerErrorStringTestSuite struct {
+	suite.Suite
+	err managerError
+}
+
+func (s *managerErrorStringTestSuite) TestEmptyString() {
+	s.Empty(s.err.String())
+}
+
+func (s *managerErrorStringTestSuite) TestNonEmptyString() {
+	s.err = append(s.err, errors.New(`expected error 1`))
+	s.err = append(s.err, errors.New(`expected error 2`))
+	s.NotEmpty(s.err.String())
+	s.Equal(`expected error 1; expected error 2`, s.err.String())
+}
+
+type managerErrorErrorTestSuite struct {
+	suite.Suite
+	err managerError
+}
+
+func (s *managerErrorErrorTestSuite) TestEmptyError() {
+	s.Empty(s.err.Error())
+}
+
+func (s *managerErrorErrorTestSuite) TestNonEmptyError() {
+	s.err = append(s.err, errors.New(`expected error 1`))
+	s.err = append(s.err, errors.New(`expected error 2`))
+	s.NotEmpty(s.err.Error())
+	s.Equal(`expected error 1; expected error 2`, s.err.Error())
+}
+
+type managerErrorHasErrorsTestSuite struct {
+	suite.Suite
+	err managerError
+}
+
+func (s *managerErrorHasErrorsTestSuite) TestEmptyError() {
+	s.False(s.err.HasErrors())
+}
+
+func (s *managerErrorHasErrorsTestSuite) TestNonEmptyError() {
+	s.err = append(s.err, errors.New(`expected error 1`))
+	s.err = append(s.err, errors.New(`expected error 2`))
+	s.True(s.err.HasErrors())
+}
+
+// --- Mocks ---
+
+// MockRegistry is an autogenerated mock type for the Registry type
+type MockRegistry struct {
+	mock.Mock
+}
+
+// Deregister provides a mock function with given fields: ctx, serviceID
+func (_m *MockRegistry) Deregister(ctx context.Context, serviceID string) error {
+	ret := _m.Called(ctx, serviceID)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(context.Context, string) error); ok {
+		r0 = rf(ctx, serviceID)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// Fetch provides a mock function with given fields: ctx
+func (_m *MockRegistry) Fetch(ctx context.Context) (Services, error) {
+	ret := _m.Called(ctx)
+
+	var r0 Services
+	if rf, ok := ret.Get(0).(func(context.Context) Services); ok {
+		r0 = rf(ctx)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(Services)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(ctx)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Register provides a mock function with given fields: ctx, service
+func (_m *MockRegistry) Register(ctx context.Context, service *Service) error {
+	ret := _m.Called(ctx, service)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(context.Context, *Service) error); ok {
+		r0 = rf(ctx, service)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockSource is an autogenerated mock type for the Source type
+type MockSource struct {
+	mock.Mock
+}
+
+// Fetch provides a mock function with given fields: ctx
+func (_m *MockSource) Fetch(ctx context.Context) (Services, error) {
+	ret := _m.Called(ctx)
+
+	var r0 Services
+	if rf, ok := ret.Get(0).(func(context.Context) Services); ok {
+		r0 = rf(ctx)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(Services)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context) error); ok {
+		r1 = rf(ctx)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
diff --git a/pkg/core/registry.go b/pkg/core/registry.go
new file mode 100644
index 0000000..1c4dd45
--- /dev/null
+++ b/pkg/core/registry.go
@@ -0,0 +1,15 @@
+package core
+
+import (
+	"context"
+)
+
+type (
+	// Registry is endpoint/upstream for storing information about Services fetched from Source.
+	// Registry must implements 3 methods to make store clean: fetch current state, deregister orphans, register/update incoming
+	Registry interface {
+		Fetch(ctx context.Context) (Services, error)
+		Register(ctx context.Context, service *Service) error
+		Deregister(ctx context.Context, serviceID string) error
+	}
+)
diff --git a/pkg/core/registry/consul/registry.go b/pkg/core/registry/consul/registry.go
new file mode 100644
index 0000000..744bd5c
--- /dev/null
+++ b/pkg/core/registry/consul/registry.go
@@ -0,0 +1,87 @@
+package consul
+
+import (
+	"context"
+
+	"github.com/agrea/ptr"
+	"github.com/hashicorp/consul/api"
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/pkg/errors"
+)
+
+type (
+	Agent interface {
+		Services() (map[string]*api.AgentService, error)
+		ServiceRegister(service *api.AgentServiceRegistration) error
+		ServiceDeregister(serviceID string) error
+	}
+	Registry struct {
+		agent Agent
+	}
+)
+
+func NewRegistry(agent Agent) *Registry {
+	return &Registry{
+		agent: agent,
+	}
+}
+
+func (r *Registry) Fetch(_ context.Context) (core.Services, error) {
+	registered, err := r.agent.Services()
+	if err != nil {
+		return nil, errors.Wrap(err, `failed to fetch registered services info`)
+	}
+	result := make([]*core.Service, 0)
+	for _, item := range registered {
+		service := &core.Service{
+			Name:    item.Service,
+			Address: item.Address,
+			ID:      ptr.String(item.ID),
+		}
+		if item.Port != 0 {
+			service.Port = ptr.Int(item.Port)
+		}
+		if len(item.Tags) > 0 {
+			service.Tags = &item.Tags
+		}
+		if len(item.Meta) > 0 {
+			service.Meta = &item.Meta
+		}
+		result = append(result, service)
+	}
+	return result, nil
+}
+
+func (r *Registry) Deregister(_ context.Context, serviceID string) error {
+	if err := r.agent.ServiceDeregister(serviceID); err != nil {
+		return errors.Wrapf(err, `failed deregister service by service id "%s"`, serviceID)
+	}
+	return nil
+}
+
+func (r *Registry) Register(ctx context.Context, service *core.Service) error {
+	if err := service.Validate(ctx); err != nil {
+		return errors.Wrap(err, `service has validation error before registration`)
+	}
+	asr := &api.AgentServiceRegistration{
+		Kind:    api.ServiceKindTypical,
+		Name:    service.Name,
+		Address: service.Address,
+	}
+	if service.ID != nil {
+		asr.ID = *service.ID
+	}
+	if service.Port != nil {
+		asr.Port = *service.Port
+	}
+	if service.Tags != nil {
+		asr.Tags = *service.Tags
+	}
+	if service.Meta != nil {
+		asr.Meta = *service.Meta
+	}
+	if err := r.agent.ServiceRegister(asr); err != nil {
+		return errors.Wrapf(err, `failed register service by service id "%s"`, service.RegistrationID())
+	}
+	return nil
+}
diff --git a/pkg/core/registry/consul/registry_test.go b/pkg/core/registry/consul/registry_test.go
new file mode 100644
index 0000000..80b2b58
--- /dev/null
+++ b/pkg/core/registry/consul/registry_test.go
@@ -0,0 +1,221 @@
+package consul
+
+import (
+	"context"
+	"testing"
+
+	"github.com/agrea/ptr"
+	"github.com/hashicorp/consul/api"
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/pkg/errors"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/suite"
+)
+
+// --- Tests ---
+
+func TestNewRegistry(t *testing.T) {
+	suite.Run(t, new(newRegistryTestSuite))
+}
+
+func TestRegistry_Fetch(t *testing.T) {
+	suite.Run(t, new(registryFetchTestSuite))
+}
+
+func TestRegistry_Deregister(t *testing.T) {
+	suite.Run(t, new(registryDeregisterTestSuite))
+}
+
+func TestRegistry_Register(t *testing.T) {
+	suite.Run(t, new(registryRegisterTestSuite))
+}
+
+// --- Suites ---
+
+type newRegistryTestSuite struct {
+	suite.Suite
+}
+
+func (s *newRegistryTestSuite) TestNewSource() {
+	got := NewRegistry(nil)
+	s.Implements((*core.Registry)(nil), got)
+	s.Equal(&Registry{nil}, got)
+}
+
+type registryFetchTestSuite struct {
+	suite.Suite
+	agent    *MockAgent
+	registry *Registry
+}
+
+func (s *registryFetchTestSuite) SetupTest() {
+	s.agent = new(MockAgent)
+	s.registry = NewRegistry(s.agent)
+}
+
+func (s *registryFetchTestSuite) TestErrorAgentFetch() {
+	s.agent.On(`Services`).Return(nil, errors.New(`expected error`))
+
+	s.registry.agent = s.agent
+	services, err := s.registry.Fetch(context.Background())
+	s.Nil(services)
+	s.EqualError(err, `failed to fetch registered services info: expected error`)
+}
+
+func (s *registryFetchTestSuite) TestSuccess() {
+	s.agent.On(`Services`).Return(map[string]*api.AgentService{
+		`name`: {
+			ID:      `id`,
+			Service: `name`,
+			Tags:    []string{`tags`},
+			Meta:    map[string]string{`key`: `value`},
+			Port:    80,
+			Address: `127.0.0.1`,
+		},
+	}, nil)
+
+	fetchedServices, err := s.registry.Fetch(context.Background())
+
+	expectedTags := []string{`tags`}
+	expectedMeta := map[string]string{`key`: `value`}
+	s.NoError(err)
+	s.Equal(core.Services{
+		&core.Service{
+			Name:    `name`,
+			Address: `127.0.0.1`,
+			ID:      ptr.String(`id`),
+			Tags:    &expectedTags,
+			Meta:    &expectedMeta,
+			Port:    ptr.Int(80),
+		},
+	}, fetchedServices)
+
+}
+
+type registryDeregisterTestSuite struct {
+	suite.Suite
+	agent    *MockAgent
+	registry *Registry
+}
+
+func (s *registryDeregisterTestSuite) SetupTest() {
+	s.agent = new(MockAgent)
+	s.registry = NewRegistry(s.agent)
+}
+
+func (s *registryDeregisterTestSuite) TestErrorAgentDeregister() {
+	s.agent.On(`ServiceDeregister`, `service`).Return(errors.New(`expected error`))
+
+	err := s.registry.Deregister(context.Background(), `service`)
+	s.EqualError(err, `failed deregister service by service id "service": expected error`)
+}
+
+func (s *registryDeregisterTestSuite) TestSuccess() {
+	s.agent.On(`ServiceDeregister`, `service`).Return(nil)
+
+	err := s.registry.Deregister(context.Background(), `service`)
+	s.NoError(err)
+}
+
+type registryRegisterTestSuite struct {
+	suite.Suite
+	agent    *MockAgent
+	registry *Registry
+}
+
+func (s *registryRegisterTestSuite) SetupTest() {
+	s.agent = new(MockAgent)
+	s.registry = NewRegistry(s.agent)
+}
+
+func (s *registryRegisterTestSuite) TestErrorServiceValidation() {
+	err := s.registry.Register(context.Background(), &core.Service{
+		Name: `name`,
+	})
+	s.Error(err)
+	s.Contains(err.Error(), `service has validation error before registration`)
+}
+
+func (s *registryRegisterTestSuite) TestErrorAgentRegister() {
+	s.agent.On(`ServiceRegister`, mock.Anything).Return(errors.New(`expected error`))
+
+	err := s.registry.Register(context.Background(), &core.Service{
+		Name:    `name`,
+		Address: `127.0.0.1`,
+	})
+	s.EqualError(err, `failed register service by service id "name": expected error`)
+}
+
+func (s *registryRegisterTestSuite) TestSuccess() {
+	s.agent.On(`ServiceRegister`, mock.Anything).Return(nil)
+
+	expectedTags := []string{`tags`}
+	expectedMeta := map[string]string{`key`: `value`}
+	err := s.registry.Register(context.Background(), &core.Service{
+		Name:    `name`,
+		Address: `127.0.0.1`,
+		ID:      ptr.String(`id`),
+		Tags:    &expectedTags,
+		Meta:    &expectedMeta,
+		Port:    ptr.Int(80),
+	})
+	s.NoError(err)
+}
+
+// --- Mocks ---
+
+// MockAgent is an autogenerated mock type for the Agent type
+type MockAgent struct {
+	mock.Mock
+}
+
+// ServiceDeregister provides a mock function with given fields: serviceID
+func (_m *MockAgent) ServiceDeregister(serviceID string) error {
+	ret := _m.Called(serviceID)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(string) error); ok {
+		r0 = rf(serviceID)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// ServiceRegister provides a mock function with given fields: service
+func (_m *MockAgent) ServiceRegister(service *api.AgentServiceRegistration) error {
+	ret := _m.Called(service)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(*api.AgentServiceRegistration) error); ok {
+		r0 = rf(service)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// Services provides a mock function with given fields:
+func (_m *MockAgent) Services() (map[string]*api.AgentService, error) {
+	ret := _m.Called()
+
+	var r0 map[string]*api.AgentService
+	if rf, ok := ret.Get(0).(func() map[string]*api.AgentService); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(map[string]*api.AgentService)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func() error); ok {
+		r1 = rf()
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
diff --git a/pkg/core/scheduler.go b/pkg/core/scheduler.go
new file mode 100644
index 0000000..6bc4928
--- /dev/null
+++ b/pkg/core/scheduler.go
@@ -0,0 +1,37 @@
+package core
+
+import (
+	"context"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+type (
+	Scheduler struct {
+		ticker  *time.Ticker
+		manager ManagerInterface
+		logger  LoggerInterface
+	}
+)
+
+func NewScheduler(ticker *time.Ticker, manager ManagerInterface, logger LoggerInterface) *Scheduler {
+	return &Scheduler{
+		ticker:  ticker,
+		manager: manager,
+		logger:  logger,
+	}
+}
+
+func (s *Scheduler) Run(ctx context.Context) {
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-s.ticker.C:
+			if err := s.manager.Run(ctx); err != nil {
+				s.logger.Errorln(errors.Wrap(err, `failed to process manager run`).Error())
+			}
+		}
+	}
+}
diff --git a/pkg/core/scheduler_test.go b/pkg/core/scheduler_test.go
new file mode 100644
index 0000000..6998d64
--- /dev/null
+++ b/pkg/core/scheduler_test.go
@@ -0,0 +1,98 @@
+package core
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus/hooks/test"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/suite"
+)
+
+// --- Tests ---
+
+func TestNewScheduler(t *testing.T) {
+	suite.Run(t, new(newSchedulerTestSuite))
+}
+
+func TestScheduler_Run(t *testing.T) {
+	suite.Run(t, new(schedulerRunTestSuite))
+}
+
+// --- Suites ---
+
+type newSchedulerTestSuite struct {
+	suite.Suite
+}
+
+func (s *newSchedulerTestSuite) TestNewManager() {
+	s.Equal(
+		&Scheduler{nil, nil, nil},
+		NewScheduler(nil, nil, nil),
+	)
+}
+
+type schedulerRunTestSuite struct {
+	suite.Suite
+	manager   *MockManagerInterface
+	scheduler *Scheduler
+	hook      *test.Hook
+}
+
+func (s *schedulerRunTestSuite) SetupTest() {
+	logger, hook := test.NewNullLogger()
+	s.manager = new(MockManagerInterface)
+	s.hook = hook
+	s.scheduler = &Scheduler{
+		ticker:  time.NewTicker(time.Microsecond * 100),
+		manager: s.manager,
+		logger:  logger,
+	}
+}
+
+func (s *schedulerRunTestSuite) TestWithManagerError() {
+	s.manager.On(`Run`, mock.Anything).Return(errors.New(`expected error`))
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		s.scheduler.Run(ctx)
+	}()
+
+	<-time.Tick(time.Microsecond * 1000)
+	cancel()
+	s.Equal(s.hook.LastEntry().Message, `failed to process manager run: expected error`)
+}
+
+func (s *schedulerRunTestSuite) TestWithoutManagerError() {
+	s.manager.On(`Run`, mock.Anything).Return(nil)
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		s.scheduler.Run(ctx)
+	}()
+
+	<-time.Tick(time.Microsecond * 100)
+	cancel()
+	s.Len(s.hook.AllEntries(), 0)
+}
+
+// --- Mocks ---
+
+// MockManagerInterface is an autogenerated mock type for the ManagerInterface type
+type MockManagerInterface struct {
+	mock.Mock
+}
+
+// Run provides a mock function with given fields: ctx
+func (_m *MockManagerInterface) Run(ctx context.Context) error {
+	ret := _m.Called(ctx)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(context.Context) error); ok {
+		r0 = rf(ctx)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
diff --git a/pkg/core/service.go b/pkg/core/service.go
new file mode 100644
index 0000000..d49c1bb
--- /dev/null
+++ b/pkg/core/service.go
@@ -0,0 +1,53 @@
+package core
+
+import (
+	"context"
+
+	"github.com/go-playground/validator/v10"
+	"github.com/spf13/cast"
+	"github.com/thoas/go-funk"
+)
+
+var (
+	validation = validator.New()
+)
+
+type (
+	Service struct {
+		Name    string             `json:"," validate:"required"`
+		Address string             `json:"," validate:"required"`
+		ID      *string            `json:",omitempty"`
+		Port    *int               `json:",omitempty"`
+		Tags    *[]string          `json:",omitempty"`
+		Meta    *map[string]string `json:",omitempty"`
+	}
+	Services []*Service
+)
+
+func (s *Service) Validate(ctx context.Context) error {
+	return validation.StructCtx(ctx, s)
+}
+
+func (s *Service) RegistrationID() string {
+	id := s.Name
+	if s.ID != nil {
+		id = *s.ID
+	}
+	return id
+}
+
+func (s Services) IDs() []string {
+	ids := funk.Map(s, func(service *Service) string {
+		return service.RegistrationID()
+	})
+	return cast.ToStringSlice(ids)
+}
+
+func (s Services) Lookup(id string) *Service {
+	for _, service := range s {
+		if service.RegistrationID() == id {
+			return service
+		}
+	}
+	return nil
+}
diff --git a/pkg/core/service_test.go b/pkg/core/service_test.go
new file mode 100644
index 0000000..698ad6d
--- /dev/null
+++ b/pkg/core/service_test.go
@@ -0,0 +1,128 @@
+package core
+
+import (
+	"context"
+	"testing"
+
+	"github.com/agrea/ptr"
+	"github.com/stretchr/testify/suite"
+)
+
+// --- Tests ---
+
+func TestService_Validate(t *testing.T) {
+	suite.Run(t, new(serviceValidateTestSuite))
+}
+
+func TestService_RegistrationID(t *testing.T) {
+	suite.Run(t, new(serviceRegistrationIDTestSuite))
+}
+
+func TestServices_IDs(t *testing.T) {
+	suite.Run(t, new(servicesIDsTestSuite))
+}
+
+func TestServices_Lookup(t *testing.T) {
+	suite.Run(t, new(servicesLookupSuite))
+}
+
+// --- Suites ---
+
+type serviceValidateTestSuite struct {
+	suite.Suite
+	service *Service
+}
+
+func (s *serviceValidateTestSuite) SetupTest() {
+	s.service = new(Service)
+}
+
+func (s *serviceValidateTestSuite) TestEmptyName() {
+	s.service.Address = `127.0.0.1`
+	s.Error(s.service.Validate(context.Background()))
+}
+
+func (s *serviceValidateTestSuite) TestEmptyAddress() {
+	s.service.Name = `service`
+	s.Error(s.service.Validate(context.Background()))
+}
+
+func (s *serviceValidateTestSuite) TestValidationPassed() {
+	s.service.Name = `service`
+	s.service.Address = `127.0.0.1`
+	s.NoError(s.service.Validate(context.Background()))
+}
+
+type serviceRegistrationIDTestSuite struct {
+	suite.Suite
+	service *Service
+}
+
+func (s *serviceRegistrationIDTestSuite) SetupTest() {
+	s.service = new(Service)
+}
+
+func (s serviceRegistrationIDTestSuite) TestIDFromName() {
+	s.service.Name = `service`
+	s.Equal(s.service.Name, s.service.RegistrationID())
+}
+
+func (s serviceRegistrationIDTestSuite) TestIDFromID() {
+	s.service.Name = `service`
+	s.service.ID = ptr.String(`id`)
+	s.Equal(*s.service.ID, s.service.RegistrationID())
+}
+
+type servicesIDsTestSuite struct {
+	suite.Suite
+	services Services
+}
+
+func (s *servicesIDsTestSuite) SetupTest() {
+	s.services = make(Services, 0)
+}
+
+func (s *servicesIDsTestSuite) TestEmptyList() {
+	s.Empty(s.services.IDs())
+}
+
+func (s *servicesIDsTestSuite) TestNonEmptyList() {
+	s.services = append(s.services, &Service{Name: `name-1`}, &Service{ID: ptr.String(`id-1`)})
+	ids := s.services.IDs()
+	s.Len(ids, 2)
+	s.Contains(ids, `name-1`)
+	s.Contains(ids, `id-1`)
+}
+
+type servicesLookupSuite struct {
+	suite.Suite
+	services Services
+}
+
+func (s *servicesLookupSuite) SetupTest() {
+	s.services = make(Services, 0)
+}
+
+func (s *servicesLookupSuite) TestNilLookup() {
+	s.Nil(s.services.Lookup(`id`))
+}
+
+func (s *servicesLookupSuite) TestNotNilLookupByName() {
+	expected := &Service{
+		Name: `name`,
+	}
+	s.services = append(s.services, expected)
+	got := s.services.Lookup(`name`)
+	s.NotNil(got)
+	s.Equal(expected, got)
+}
+
+func (s *servicesLookupSuite) TestNotNilLookupByID() {
+	expected := &Service{
+		ID: ptr.String(`id`),
+	}
+	s.services = append(s.services, expected)
+	got := s.services.Lookup(`id`)
+	s.NotNil(got)
+	s.Equal(expected, got)
+}
diff --git a/pkg/core/source.go b/pkg/core/source.go
new file mode 100644
index 0000000..49200f2
--- /dev/null
+++ b/pkg/core/source.go
@@ -0,0 +1,13 @@
+package core
+
+import (
+	"context"
+)
+
+type (
+	// Source provides information about Services to be registered in Registry.
+	// Source does not know about changes between Fetch calls, it must just return actual state of source.
+	Source interface {
+		Fetch(ctx context.Context) (Services, error)
+	}
+)
diff --git a/pkg/core/source/file/source.go b/pkg/core/source/file/source.go
new file mode 100644
index 0000000..84a123c
--- /dev/null
+++ b/pkg/core/source/file/source.go
@@ -0,0 +1,55 @@
+package file
+
+import (
+	"context"
+
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/pkg/errors"
+	"gopkg.in/yaml.v3"
+)
+
+type (
+	Reader interface {
+		ReadFile(name string) ([]byte, error)
+	}
+	Path   string
+	Source struct {
+		reader   Reader
+		filename Path
+		logger   core.LoggerInterface
+	}
+)
+
+func NewSource(reader Reader, filename Path) *Source {
+	return &Source{
+		reader:   reader,
+		filename: filename,
+	}
+}
+
+func (s *Source) Fetch(ctx context.Context) (core.Services, error) {
+	contents, err := s.reader.ReadFile(string(s.filename))
+	if err != nil {
+		return nil, errors.Wrap(err, `failed read content from config file`)
+	}
+
+	items := make([]*core.Service, 0)
+	if err := yaml.Unmarshal(contents, &items); err != nil {
+		return nil, errors.Wrap(err, `failed unmarshal content from config file`)
+	}
+
+	result := make([]*core.Service, 0)
+	for _, item := range items {
+		if err := item.Validate(ctx); err != nil {
+			s.logger.Warningln(errors.Wrap(err, `failed to validate service`).Error())
+			continue
+		}
+		result = append(result, item)
+	}
+
+	return result, nil
+}
+
+func (s *Source) WithLogger(logger core.LoggerInterface) {
+	s.logger = logger
+}
diff --git a/pkg/core/source/file/source_test.go b/pkg/core/source/file/source_test.go
new file mode 100644
index 0000000..8817247
--- /dev/null
+++ b/pkg/core/source/file/source_test.go
@@ -0,0 +1,126 @@
+package file
+
+import (
+	"context"
+	"testing"
+
+	"github.com/insidieux/pinchy/pkg/core"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"github.com/sirupsen/logrus/hooks/test"
+	"github.com/spf13/afero"
+	"github.com/stretchr/testify/suite"
+	"gopkg.in/yaml.v3"
+)
+
+// --- Tests ---
+
+func TestNewSource(t *testing.T) {
+	suite.Run(t, new(newSourceTestSuite))
+}
+
+func TestSource_Fetch(t *testing.T) {
+	suite.Run(t, new(sourceFetchTestSuite))
+}
+
+// --- Suites ---
+
+type newSourceTestSuite struct {
+	suite.Suite
+}
+
+func (s *newSourceTestSuite) TestNewSource() {
+	got := NewSource(nil, `filename`)
+	s.Implements((*core.Source)(nil), got)
+	s.Equal(&Source{nil, `filename`, nil}, got)
+}
+
+type sourceFetchTestSuite struct {
+	suite.Suite
+	source *Source
+	reader afero.Afero
+}
+
+func (s *sourceFetchTestSuite) SetupTest() {
+	s.reader = afero.Afero{Fs: afero.NewMemMapFs()}
+	s.source = NewSource(s.reader, `filename`)
+}
+
+func (s *sourceFetchTestSuite) TestErrorRead() {
+	services, err := s.source.Fetch(context.Background())
+	s.Nil(services)
+	s.Error(err)
+	s.EqualError(err, `failed read content from config file: open filename: file does not exist`)
+}
+
+func (s *sourceFetchTestSuite) TestErrorUnmarshal() {
+	inMemoryFile, err := s.reader.Create(string(s.source.filename))
+	if err != nil {
+		panic(errors.Wrap(err, `failed to create in-memory file`))
+	}
+	if _, err := inMemoryFile.WriteString(`{"key": "value"}`); err != nil {
+		panic(errors.Wrap(err, `failed to write to in-memory file`))
+	}
+
+	services, err := s.source.Fetch(context.Background())
+	s.Nil(services)
+	s.Error(err)
+	s.Contains(err.Error(), `failed unmarshal content from config file`)
+}
+
+func (s *sourceFetchTestSuite) TestSkipServiceValidationCase() {
+	inMemoryFile, err := s.reader.Create(string(s.source.filename))
+	if err != nil {
+		panic(errors.Wrap(err, `failed to create in-memory file`))
+	}
+	serviceBytes, err := yaml.Marshal(core.Services{
+		{
+			Name: `service`,
+		},
+	})
+	if err != nil {
+		panic(errors.Wrap(err, `failed to marshal service`))
+	}
+	if _, err := inMemoryFile.Write(serviceBytes); err != nil {
+		panic(errors.Wrap(err, `failed to write to in-memory file`))
+	}
+
+	logger, hook := test.NewNullLogger()
+	s.source.WithLogger(logger)
+
+	services, err := s.source.Fetch(context.Background())
+	s.NotNil(services)
+	s.NoError(err)
+	s.Equal(core.Services{}, services)
+	s.Equal(hook.LastEntry().Level, logrus.WarnLevel)
+	s.Contains(hook.LastEntry().Message, `failed to validate service`)
+}
+
+func (s *sourceFetchTestSuite) TestSuccess() {
+	inMemoryFile, err := s.reader.Create(string(s.source.filename))
+	if err != nil {
+		panic(errors.Wrap(err, `failed to create in-memory file`))
+	}
+	expected := core.Services{
+		{
+			Name:    `service-1`,
+			Address: `127.0.0.1`,
+		},
+		{
+			Name:    `service-2`,
+			Address: `127.0.0.2`,
+		},
+	}
+	servicesBytes, err := yaml.Marshal(expected)
+	if err != nil {
+		panic(errors.Wrap(err, `failed to marshal services`))
+	}
+	if _, err := inMemoryFile.Write(servicesBytes); err != nil {
+		panic(errors.Wrap(err, `failed to write to in-memory file`))
+	}
+
+	services, err := s.source.Fetch(context.Background())
+	s.NotNil(services)
+	s.NoError(err)
+	s.Equal(expected, services)
+}
diff --git a/test/.gitignore b/test/.gitignore
new file mode 100644
index 0000000..d6b7ef3
--- /dev/null
+++ b/test/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore