forked from benthosdev/benthos
/
redis_pubsub.go
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/
redis_pubsub.go
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// Copyright (c) 2018 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package writer
import (
"net/url"
"sync"
"time"
"github.com/Jeffail/benthos/lib/log"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/types"
"github.com/go-redis/redis"
)
//------------------------------------------------------------------------------
// RedisPubSubConfig contains configuration fields for the RedisPubSub output
// type.
type RedisPubSubConfig struct {
URL string `json:"url" yaml:"url"`
Channel string `json:"channel" yaml:"channel"`
}
// NewRedisPubSubConfig creates a new RedisPubSubConfig with default values.
func NewRedisPubSubConfig() RedisPubSubConfig {
return RedisPubSubConfig{
URL: "tcp://localhost:6379",
Channel: "benthos_chan",
}
}
//------------------------------------------------------------------------------
// RedisPubSub is an output type that serves RedisPubSub messages.
type RedisPubSub struct {
log log.Modular
stats metrics.Type
url *url.URL
conf RedisPubSubConfig
client *redis.Client
connMut sync.RWMutex
}
// NewRedisPubSub creates a new RedisPubSub output type.
func NewRedisPubSub(
conf RedisPubSubConfig,
log log.Modular,
stats metrics.Type,
) (*RedisPubSub, error) {
r := &RedisPubSub{
log: log.NewModule(".output.redis_pubsub"),
stats: stats,
conf: conf,
}
var err error
r.url, err = url.Parse(conf.URL)
if err != nil {
return nil, err
}
return r, nil
}
//------------------------------------------------------------------------------
// Connect establishes a connection to an RedisPubSub server.
func (r *RedisPubSub) Connect() error {
r.connMut.Lock()
defer r.connMut.Unlock()
var pass string
if r.url.User != nil {
pass, _ = r.url.User.Password()
}
client := redis.NewClient(&redis.Options{
Addr: r.url.Host,
Network: r.url.Scheme,
Password: pass,
})
if _, err := client.Ping().Result(); err != nil {
return err
}
r.log.Infof("Pushing messages to Redis channel %v at URL: %v\n", r.conf.Channel, r.conf.URL)
r.client = client
return nil
}
//------------------------------------------------------------------------------
// Write attempts to write a message by pushing it to the end of a Redis list.
func (r *RedisPubSub) Write(msg types.Message) error {
r.connMut.RLock()
client := r.client
r.connMut.RUnlock()
if client == nil {
return types.ErrNotConnected
}
return msg.Iter(func(i int, p types.Part) error {
if err := client.Publish(r.conf.Channel, p.Get()).Err(); err != nil {
r.disconnect()
r.log.Errorf("Error from redis: %v\n", err)
return types.ErrNotConnected
}
return nil
})
}
// disconnect safely closes a connection to an RedisPubSub server.
func (r *RedisPubSub) disconnect() error {
r.connMut.Lock()
defer r.connMut.Unlock()
if r.client != nil {
err := r.client.Close()
r.client = nil
return err
}
return nil
}
// CloseAsync shuts down the RedisPubSub output and stops processing messages.
func (r *RedisPubSub) CloseAsync() {
r.disconnect()
}
// WaitForClose blocks until the RedisPubSub output has closed down.
func (r *RedisPubSub) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------