New http-request agent (#537)

examples/applications/http-request-processor/README.md

@@ -0,0 +1,19 @@
+# Http Request processor
+
+This sample application shows how to execute the http request processor.
+
+
+## Deploy the LangStream application
+```
+./bin/langstream apps deploy test -app examples/applications/http-request-processor -i examples/instances/kafka-kubernetes.yaml 
+```
+
+## Chat
+
+Since the application opens a gateway, we can use the gateway API to send and consume messages using the use gateway `chat` feature:
+```
+./bin/langstream gateway chat test -g chat
+```
+
+Ask about a city and you will get the timezone.
+

examples/applications/http-request-processor/gateways.yaml

@@ -0,0 +1,23 @@
+#
+#
+# Copyright DataStax, Inc.
+#
+# 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.
+#
+
+gateways:
+  - id: chat
+    type: chat
+    chat-options:
+      answers-topic: output-topic
+      questions-topic: input-topic

examples/applications/http-request-processor/pipeline.yaml

@@ -0,0 +1,52 @@
+#
+# Copyright DataStax, Inc.
+#
+# 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.
+#
+
+topics:
+  - name: "input-topic"
+    creation-mode: create-if-not-exists
+  - name: "output-topic"
+    creation-mode: create-if-not-exists
+pipeline:
+  - name: "convert-to-json"
+    type: "document-to-json"
+    input: "input-topic"
+    configuration:
+      text-field: "city"
+  - name: "Get timezone info from geocoding API"
+    type: "http-request"
+    configuration:
+        url: "https://geocoding-api.open-meteo.com/v1/search"
+        query-string:
+          name: "{{{ value.city }}}"
+          count: "1"
+          format: "json"
+        output-field: "value.response"
+        method: "GET"
+
+  - name: "Extract timezone"
+    type: "compute"
+    configuration:
+      fields:
+        - name: "value.timezone"
+          expression: "value.response.results[0].timezone"
+          type: STRING
+
+  - name: "Extract timezone"
+    type: "drop-fields"
+    output: "output-topic"
+    configuration:
+      fields:
+        - response

langstream-agents/langstream-agent-http-request/pom.xml

@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright DataStax, Inc.
+
+    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.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <parent>
+    <artifactId>langstream-agents</artifactId>
+    <groupId>ai.langstream</groupId>
+    <version>0.1.1-SNAPSHOT</version>
+  </parent>
+  <modelVersion>4.0.0</modelVersion>
+
+  <artifactId>langstream-agent-http-request</artifactId>
+  <dependencies>
+    <dependency>
+      <groupId>${project.groupId}</groupId>
+      <artifactId>langstream-api</artifactId>
+      <version>${project.version}</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>${project.groupId}</groupId>
+      <artifactId>langstream-agents-commons</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.projectlombok</groupId>
+      <artifactId>lombok</artifactId>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.samskivert</groupId>
+      <artifactId>jmustache</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>ch.qos.logback</groupId>
+      <artifactId>logback-core</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>ch.qos.logback</groupId>
+      <artifactId>logback-classic</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.nifi</groupId>
+        <artifactId>nifi-nar-maven-plugin</artifactId>
+        <extensions>true</extensions>
+        <configuration>
+          <classifier>nar</classifier>
+        </configuration>
+        <executions>
+          <execution>
+            <id>default-nar</id>
+            <phase>package</phase>
+            <goals>
+              <goal>nar</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>