conf.go

/*
Copyright 2019 The Arktos Authors.

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.
*/
package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/futurewei-cloud/cniplugins/alktron/neutron"
	"github.com/tkanos/gonfig"
)

// NeutronConfig keeps the config settings for neutron access
type NeutronConfig struct {
	User                        string `json:"user" env:"ALKTRON_USER"`
	Password                    string `json:"password" env:"ALKTRON_PASSWORD"`
	IdentityURL                 string `json:"identity_url" env:"ALKTRON_IDENTITYURL"`
	Host                        string `json:"host" env:"ALKTRON_HOST"`
	ProbeIntervalInMilliseconds uint32 `json:"interval_in_ms" env:"ALKTRON_PROBEINTERVALINMS"`
	ProbeTimeoutInSeconds       uint32 `json:"timeout_in_sec" env:"ALKTRON_PROBETIMEOUTINSEC"`
	Region                      string `json:"region" env:"ALKTRON_REGION"`
}

const (
	defaultNeutronConfPath = "/etc/alktron/neutron.json"
	defaultOpenStackRegion = "RegionOne"
)

func loadNeutronConfig() (*NeutronConfig, error) {
	neutronConfPath := os.Getenv("ALKTRON_NEUTRONCONF_PATH")
	if neutronConfPath == "" {
		neutronConfPath = defaultNeutronConfPath
	}

	c := &NeutronConfig{}
	if err := gonfig.GetConf(neutronConfPath, c); err != nil {
		return nil, fmt.Errorf("failed to load neutron conf: %v", err)
	}

	if strings.TrimSpace(c.Region) == "" {
		c.Region = defaultOpenStackRegion
	}

	return c, nil
}

func (c NeutronConfig) getNeutronClient(domain, vpc string) (*neutron.Client, error) {
	if err := c.validate(); err != nil {
		return nil, err
	}

	return neutron.New(c.User, c.Password, c.Region, domain, vpc, c.IdentityURL)
}

func (c NeutronConfig) validate() error {
	if c.User == "" {
		return fmt.Errorf("invalid neutron config: User not specified")
	}

	if c.Password == "" {
		return fmt.Errorf("invalid neutron config: Password not specified")
	}

	if c.IdentityURL == "" {
		return fmt.Errorf("invalid neutron config: IdentityURL not specified")
	}

	return nil
}