/
redis.go
139 lines (125 loc) · 3.48 KB
/
redis.go
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// Copyright (c) 2017 Pulcy.
//
// 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 service
import (
"bytes"
"fmt"
"os"
"os/exec"
"strconv"
"time"
"github.com/adjust/redis"
retry "github.com/giantswarm/retry-go"
)
// Start the redis process
func (s *Service) startRedis(exitChan chan int) (*exec.Cmd, error) {
args := []string{}
args = append(args,
"--protected-mode", "no",
"--port", strconv.Itoa(s.RedisPort),
)
if s.RedisAppendOnly {
args = append(args, "--appendonly", "yes")
}
if s.RedisConf != "" {
args = append(args, s.RedisConf)
}
cmd := exec.Command("redis-server", args...)
cmd.Stdin = bytes.NewReader([]byte{})
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
return nil, maskAny(err)
}
go func() {
err := cmd.Wait()
if exitErr, ok := err.(*exec.ExitError); ok {
if exitErr.Success() {
s.Logger.Debug("redis-server terminated")
exitChan <- 0
} else {
s.Logger.Errorf("redis-server terminated with error: %#v", err)
exitChan <- 1
}
} else {
s.Logger.Errorf("redis-server terminated with unknown error: %#v", err)
exitChan <- 2
}
}()
return cmd, nil
}
// configureSlaveOf configures our redis instance as slave of the given master.
func (s *Service) configureSlaveOf(masterIP, masterPort string) error {
client, err := s.connectRedis()
if err != nil {
return maskAny(err)
}
if err := client.SlaveOf(masterIP, masterPort).Err(); err != nil {
return maskAny(err)
}
return nil
}
// configureSlaveOfNoOne configures our redis instance as not replicating anything.
func (s *Service) configureSlaveOfNoOne() error {
client, err := s.connectRedis()
if err != nil {
return maskAny(err)
}
if err := client.SlaveOf("NO", "ONE").Err(); err != nil {
return maskAny(err)
}
return nil
}
// connectRedis creates a client connection to our own redis server.
func (s *Service) connectRedis() (*redis.Client, error) {
options := &redis.Options{
Addr: fmt.Sprintf("127.0.0.1:%d", s.RedisPort),
IdleTimeout: 240 * time.Second,
}
client := redis.NewTCPClient(options)
if err := retry.Do(func() error {
if err := client.Ping().Err(); err != nil {
s.Logger.Debug(nil, "Failed to ping redis: %#v", err)
return maskAny(err)
}
return nil
},
retry.Timeout(time.Second*30),
retry.MaxTries(5),
retry.Sleep(time.Second*2)); err != nil {
return nil, maskAny(err)
}
return client, nil
}
// ping tries to connect to a redis on given IP+port and ping it
func (s *Service) ping(ip, port string) error {
options := &redis.Options{
Addr: fmt.Sprintf("%s:%s", ip, port),
IdleTimeout: 240 * time.Second,
}
client := redis.NewTCPClient(options)
if err := retry.Do(func() error {
if err := client.Ping().Err(); err != nil {
s.Logger.Debug(nil, "Failed to ping redis on %s:%s: %#v", ip, port, err)
return maskAny(err)
}
return nil
},
retry.Timeout(time.Second*30),
retry.MaxTries(30),
retry.Sleep(time.Millisecond*500)); err != nil {
return maskAny(err)
}
return nil
}