/
redistest.go
249 lines (212 loc) · 4.72 KB
/
redistest.go
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// Package redistest privides temporary redis-server for testing.
//
// This is basic usage of redistest.
//
// s, err := redistest.NewServer(true, nil)
// if err != nil {
// panic(err)
// }
// defer s.Stop()
// conn, err := redis.Dial("unix", s.Config["unixsocket"])
// if err != nil {
// panic(err)
// }
// _, err = conn.Do("PING")
// if err != nil {
// panic(err)
// }
package redistest
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"sort"
"time"
)
// Server is main struct of redistest.
type Server struct {
Config Config
cmd *exec.Cmd
TempDir string
TimeOut time.Duration
reader io.ReadCloser
writer io.WriteCloser
}
// Config is configuration of redis-server.
type Config map[string]string
func (config Config) write(wc io.Writer) error {
keys := make([]string, 0, len(config))
for key := range config {
keys = append(keys, key)
}
sort.Strings(keys)
for _, key := range keys {
value := config[key]
if _, err := fmt.Fprintf(wc, "%s %s\n", key, value); err != nil {
return err
}
}
return nil
}
// Error is error while starting redis
type Error struct {
Err error
Log string
}
func (err *Error) Error() string {
return err.Err.Error() + "\n" + err.Log
}
// Cause returns the underlying cause of the error.
// The error can be inspected by errors.Cause https://github.com/pkg/errors
func (err *Error) Cause() error {
return err.Err
}
// NewServer create a new Server.
// If config is nil, redistest use default value. It means use unixsocket, dir is random.
func NewServer(autostart bool, config Config) (*Server, error) {
server := new(Server)
if config == nil {
config = Config{}
}
dir, err := ioutil.TempDir("", "redistest")
if err != nil {
return nil, err
}
server.TempDir = dir
server.TimeOut = time.Second * 3
if _, ok := config["dir"]; !ok {
config["dir"] = server.TempDir
}
if config["loglevel"] == "warning" {
fmt.Println(`redistest does not support "loglevel warning", using "notice" instead.`)
config["loglevel"] = "notice"
}
_, hasPort := config["port"]
_, hasUnixSocket := config["unixsocket"]
if !hasPort && !hasUnixSocket {
config["port"] = "0"
config["unixsocket"] = filepath.Join(server.TempDir, "redis.sock")
}
server.Config = config
if autostart {
if err := server.Start(); err != nil {
return nil, err
}
}
return server, nil
}
// Start start redis-server.
func (server *Server) Start() error {
conffile, err := server.createConfigFile()
if err != nil {
return err
}
path, err := exec.LookPath("redis-server")
if err != nil {
return err
}
buf := new(bytes.Buffer)
server.reader, server.writer = io.Pipe()
log := io.MultiWriter(buf, server.writer)
cmd := exec.Command(path, conffile.Name())
cmd.Stderr = log
cmd.Stdout = log
server.cmd = cmd
// start
if err := cmd.Start(); err != nil {
return err
}
// check server is launced ?
if err := server.checkLaunch(server.reader); err != nil {
return &Error{Err: err, Log: buf.String()}
}
return nil
}
// Stop stop redis-server
func (server *Server) Stop() error {
defer os.RemoveAll(server.TempDir)
// kill process
if err := server.killAndWait(); err != nil {
return err
}
if server.writer != nil {
if err := server.writer.Close(); err != nil {
return err
}
}
if server.reader != nil {
if err := server.reader.Close(); err != nil {
return err
}
}
return nil
}
func (server *Server) killAndWait() error {
if err := server.cmd.Process.Kill(); err != nil {
return err
}
if err := server.cmd.Wait(); err != nil {
if _, ok := err.(*exec.ExitError); ok {
// err may be "signal: killed". ignore it.
return nil
}
return err
}
return nil
}
func (server *Server) createConfigFile() (*os.File, error) {
conffile, err := os.OpenFile(
filepath.Join(server.TempDir, "redis.conf"),
os.O_RDWR|os.O_CREATE|os.O_EXCL,
0755,
)
defer conffile.Close()
if err != nil {
return nil, err
}
if err := server.Config.write(conffile); err != nil {
return nil, err
}
return conffile, nil
}
var reg = regexp.MustCompile("[Rr]eady to accept connections")
func (server *Server) checkLaunch(r io.Reader) error {
done := make(chan struct{})
go func() {
// wait until the server is ready
s := bufio.NewScanner(r)
for s.Scan() {
if reg.Match(s.Bytes()) {
close(done)
break
}
}
// ignore other logs
for s.Scan() {
}
type closer interface {
CloseWithError(err error) error
}
if r, ok := r.(closer); ok {
r.CloseWithError(s.Err())
}
}()
select {
case <-done:
// The server is now ready to accept connections
case <-time.After(server.TimeOut):
// timeout
if err := server.Stop(); err != nil {
return err
}
return errors.New("*** failed to launch redis-server ***")
}
return nil
}