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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 reader
import (
"net/url"
"sync"
"time"
"github.com/Jeffail/benthos/lib/log"
"github.com/Jeffail/benthos/lib/message"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/types"
"github.com/go-redis/redis"
)
//------------------------------------------------------------------------------
// RedisListConfig contains configuration fields for the RedisList input type.
type RedisListConfig struct {
URL string `json:"url" yaml:"url"`
Key string `json:"key" yaml:"key"`
TimeoutMS int `json:"timeout_ms" yaml:"timeout_ms"`
}
// NewRedisListConfig creates a new RedisListConfig with default values.
func NewRedisListConfig() RedisListConfig {
return RedisListConfig{
URL: "tcp://localhost:6379",
Key: "benthos_list",
TimeoutMS: 5000,
}
}
//------------------------------------------------------------------------------
// RedisList is an input type that reads Redis List messages.
type RedisList struct {
client *redis.Client
cMut sync.Mutex
url *url.URL
conf RedisListConfig
stats metrics.Type
log log.Modular
}
// NewRedisList creates a new RedisList input type.
func NewRedisList(
conf RedisListConfig, log log.Modular, stats metrics.Type,
) (*RedisList, error) {
r := &RedisList{
conf: conf,
stats: stats,
log: log.NewModule(".input.redis_list"),
}
var err error
r.url, err = url.Parse(r.conf.URL)
if err != nil {
return nil, err
}
return r, nil
}
//------------------------------------------------------------------------------
// Connect establishes a connection to a Redis server.
func (r *RedisList) Connect() error {
r.cMut.Lock()
defer r.cMut.Unlock()
if r.client != nil {
return nil
}
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("Receiving messages from Redis list: %v\n", r.conf.Key)
r.client = client
return nil
}
// Read attempts to pop a message from a Redis list.
func (r *RedisList) Read() (types.Message, error) {
var client *redis.Client
r.cMut.Lock()
client = r.client
r.cMut.Unlock()
if client == nil {
return nil, types.ErrNotConnected
}
res, err := client.BLPop(
time.Millisecond*time.Duration(r.conf.TimeoutMS),
r.conf.Key,
).Result()
if err != nil && err != redis.Nil {
r.disconnect()
r.log.Errorf("Error from redis: %v\n", err)
return nil, types.ErrNotConnected
}
if len(res) < 2 {
return nil, types.ErrTimeout
}
return message.New([][]byte{[]byte(res[1])}), nil
}
// Acknowledge is a noop since Redis Lists do not support acknowledgements.
func (r *RedisList) Acknowledge(err error) error {
return nil
}
// disconnect safely closes a connection to an RedisList server.
func (r *RedisList) disconnect() error {
r.cMut.Lock()
defer r.cMut.Unlock()
var err error
if r.client != nil {
err = r.client.Close()
r.client = nil
}
return err
}
// CloseAsync shuts down the RedisList input and stops processing requests.
func (r *RedisList) CloseAsync() {
r.disconnect()
}
// WaitForClose blocks until the RedisList input has closed down.
func (r *RedisList) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------