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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /**************************************************************************** | ||
| * Copyright 2023 Optimizely, Inc. and contributors * | ||
| * * | ||
| * 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 syncer provides synchronization across Agent nodes | ||
| package syncer | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
|
|
||
| "github.com/go-redis/redis/v8" | ||
| "github.com/optimizely/agent/config" | ||
| ) | ||
|
|
||
| const ( | ||
| // PubSubDefaultChan will be used as default pubsub channel name | ||
| PubSubDefaultChan = "optimizely-sync" | ||
| // PubSubRedis is the name of pubsub type of Redis | ||
| PubSubRedis = "redis" | ||
| ) | ||
|
|
||
| type PubSub interface { | ||
| Publish(ctx context.Context, channel string, message interface{}) error | ||
| Subscribe(ctx context.Context, channel string) (chan string, error) | ||
| } | ||
|
|
||
| func NewPubSub(conf config.SyncConfig) (PubSub, error) { | ||
| if conf.Notification.Default == PubSubRedis { | ||
| return &pubsubRedis{ | ||
| host: conf.Pubsub[PubSubRedis].(map[string]interface{})["host"].(string), | ||
| password: conf.Pubsub[PubSubRedis].(map[string]interface{})["password"].(string), | ||
| database: conf.Pubsub[PubSubRedis].(map[string]interface{})["database"].(int), | ||
| }, nil | ||
| } | ||
| return nil, errors.New("pubsub type not supported") | ||
| } | ||
|
|
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| type pubsubRedis struct { | ||
| host string | ||
| password string | ||
| database int | ||
| } | ||
|
|
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| func (r *pubsubRedis) Publish(ctx context.Context, channel string, message interface{}) error { | ||
| client := redis.NewClient(&redis.Options{ | ||
| Addr: r.host, | ||
| Password: r.password, | ||
| DB: r.database, | ||
| }) | ||
| defer client.Close() | ||
|
|
||
| return client.Publish(ctx, channel, message).Err() | ||
| } | ||
|
|
||
| func (r *pubsubRedis) Subscribe(ctx context.Context, channel string) (chan string, error) { | ||
| client := redis.NewClient(&redis.Options{ | ||
| Addr: r.host, | ||
| Password: r.password, | ||
| DB: r.database, | ||
| }) | ||
|
|
||
| // Subscribe to a Redis channel | ||
| pubsub := client.Subscribe(ctx, channel) | ||
|
|
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| ch := make(chan string) | ||
|
|
||
| go func() { | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| pubsub.Close() | ||
| client.Close() | ||
| close(ch) | ||
| return | ||
| default: | ||
| msg, err := pubsub.ReceiveMessage(ctx) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| ch <- msg.Payload | ||
|
|
||
| } | ||
| } | ||
| }() | ||
| return ch, nil | ||
| } |
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