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servicedirectory.go
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servicedirectory.go
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// Copyright © 2020, 2021 Cisco
//
// SPDX-License-Identifier: Apache-2.0
//
// 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.
//
// All rights reserved.
package cmd
import (
"context"
"fmt"
"os"
"os/signal"
"github.com/CloudNativeSDWAN/cnwan-reader/pkg/configuration"
"github.com/CloudNativeSDWAN/cnwan-reader/pkg/poller"
"github.com/CloudNativeSDWAN/cnwan-reader/pkg/queue"
"github.com/CloudNativeSDWAN/cnwan-reader/pkg/sdhandler"
"github.com/CloudNativeSDWAN/cnwan-reader/pkg/services"
"github.com/rs/zerolog/log"
"github.com/spf13/cobra"
)
var (
gcloudProject string
gcloudRegion string
gcloudServAccount string
datastore services.Datastore
sendQueue queue.Queue
sdHandler sdhandler.Handler
)
// servicedirectoryCmd represents the servicedirectory command
var servicedirectoryCmd = &cobra.Command{
Use: "servicedirectory",
Short: "Connect to Service Directory to get registered services",
Long: `This command connects to Google Cloud Service Directory and
observes changes in services published in it, i.e. metadata, addresses and
ports.
In order to work, a project, location and valid credentials must be provided.`,
Run: runServiceDirectory,
Aliases: []string{"sd", "gcloud", "gcsd"},
}
func init() {
rootCmd.AddCommand(servicedirectoryCmd)
servicedirectoryCmd.Flags().StringVar(&gcloudProject, "project", "", "gcloud project name")
servicedirectoryCmd.Flags().StringVar(&gcloudRegion, "region", "", "gcloud region location. Example: us-west2")
servicedirectoryCmd.Flags().StringVar(&gcloudServAccount, "service-account", "", "path to the gcloud service account. Example: ./service-account.json")
servicedirectoryCmd.Flags().StringVar(&metadataKey, "metadata-key", "", "name of the metadata key to look for")
}
func validateSDFlags(cmd *cobra.Command) error {
conf := &configuration.Config{}
sdConf := &configuration.ServiceDirectoryConfig{}
if _conf := configuration.GetConfigFile(); _conf != nil && _conf.ServiceRegistry != nil && _conf.ServiceRegistry.GCPServiceDirectory != nil {
sdConf = _conf.ServiceRegistry.GCPServiceDirectory
conf = _conf
}
// TODO: this needs to be changed to "metadata-keys" on future versions
if len(metadataKey) == 0 {
if len(conf.MetadataKeys) == 0 {
return fmt.Errorf("error: no metadata key set")
}
metadataKey = conf.MetadataKeys[0]
}
if len(gcloudProject) == 0 {
if len(sdConf.ProjectID) == 0 {
return fmt.Errorf("error: no gcloud project name set")
}
gcloudProject = sdConf.ProjectID
}
if len(gcloudRegion) == 0 {
if len(sdConf.Region) == 0 {
return fmt.Errorf("error: no gcloud region set")
}
gcloudRegion = sdConf.Region
}
if len(gcloudServAccount) == 0 {
if len(sdConf.ServiceAccountPath) == 0 {
return fmt.Errorf("error: no service account path set")
}
gcloudServAccount = sdConf.ServiceAccountPath
}
return nil
}
func runServiceDirectory(cmd *cobra.Command, args []string) {
var err error
l := log.With().Str("func", "cmd.runServiceDirectory").Logger()
if err := validateSDFlags(cmd); err != nil {
cmd.Usage()
logger.Fatal().Err(err).Msg("error while starting service directory")
os.Exit(1)
}
l.Info().Msg("starting...")
ctx, canc := context.WithCancel(context.Background())
// Get the handler
sdHandler, err = sdhandler.New(ctx, gcloudRegion, metadataKey, gcloudProject, gcloudServAccount)
if err != nil {
l.Fatal().Err(err).Msg("error while trying to connect to service directory")
}
// Get the datastore
datastore = services.NewDatastore()
// Get the queue
servsHandler, err := services.NewHandler(ctx, sanitizeAdaptorEndpoint(endpoint))
if err != nil {
l.Fatal().Err(err).Msg("error while trying to connect to service directory")
}
sendQueue = queue.New(ctx, servsHandler)
// Get the poller
poll := poller.New(ctx, interval)
poll.SetPollFunction(processData)
poll.Start()
// Graceful shutdown
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt)
<-sig
fmt.Println()
// Cancel the context and wait for objects that use it to receive
// the stop command
canc()
l.Info().Msg("good bye!")
}
func processData() {
data := sdHandler.GetServices()
events := datastore.GetEvents(data)
if len(events) > 0 {
go sendQueue.Enqueue(events)
}
}