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redis_list.go
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/
redis_list.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"
"time"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/service/log"
"github.com/Jeffail/benthos/lib/util/service/metrics"
"github.com/go-redis/redis"
)
//------------------------------------------------------------------------------
// RedisListConfig is configuration for the RedisList output type.
type RedisListConfig struct {
URL string `json:"url" yaml:"url"`
Key string `json:"key" yaml:"key"`
}
// NewRedisListConfig creates a new RedisListConfig with default values.
func NewRedisListConfig() RedisListConfig {
return RedisListConfig{
URL: "tcp://localhost:6379",
Key: "benthos_list",
}
}
//------------------------------------------------------------------------------
// RedisList is an output type that serves RedisList messages.
type RedisList struct {
log log.Modular
stats metrics.Type
url *url.URL
conf RedisListConfig
client *redis.Client
}
// NewRedisList creates a new RedisList output type.
func NewRedisList(
conf RedisListConfig,
log log.Modular,
stats metrics.Type,
) (*RedisList, error) {
r := &RedisList{
log: log.NewModule(".output.redis_list"),
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 RedisList server.
func (r *RedisList) Connect() error {
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 list %v at URL: %v\n", r.conf.Key, 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 *RedisList) Write(msg types.Message) error {
if r.client == nil {
return types.ErrNotConnected
}
for _, part := range msg.GetAll() {
if err := r.client.RPush(r.conf.Key, part).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 RedisList server.
func (r *RedisList) disconnect() error {
if r.client != nil {
err := r.client.Close()
r.client = nil
return err
}
return nil
}
// CloseAsync shuts down the RedisList output and stops processing messages.
func (r *RedisList) CloseAsync() {
r.disconnect()
}
// WaitForClose blocks until the RedisList output has closed down.
func (r *RedisList) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------