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✨ add external simpleredis and add log for cache (#73)
* ✨ add external simpleredis and add log for cache * 🐛 fix comment
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maxlerebourg
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+2
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# simpleredis
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Minimal go redis with only get, set and delete operation
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+137
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// Package simpleredis implements utility routines for interacting.
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// It supports currently the following operations: GET, SET, DELETE,
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// and support timetoleave for keys.
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package simpleredis
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import (
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"bufio"
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"fmt"
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"net"
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"net/textproto"
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"strings"
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"time"
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)
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// Error strings for redis.
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const (
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RedisUnreachable = "redis:unreachable"
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RedisMiss = "redis:miss"
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RedisTimeout = "redis:timeout"
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)
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// A RedisCmd is used to communicate with redis at low level using commands.
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type RedisCmd struct {
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Command string
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Name string
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Data []byte
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Duration int64
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Error error
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}
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// A SimpleRedis is used to communicate with redis.
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type SimpleRedis struct {
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redisHost string
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}
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func genRedisArray(params ...[]byte) []byte {
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MSG := ""
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for cntr := 0; cntr < len(params); cntr++ {
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MSG = strings.Join([]string{MSG, string(params[cntr])}, " ")
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}
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MSG = strings.Trim(MSG, " ")
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MSG = strings.Join([]string{MSG, "\r\n"}, "")
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return []byte(MSG)
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}
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func send(wr *textproto.Writer, method string, data []byte) {
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if err := wr.PrintfLine(string(data)); err != nil {
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fmt.Printf("redis:%s %s", method, err.Error())
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}
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}
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func askRedis(hostnamePort string, cmd RedisCmd, channel chan RedisCmd) {
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dialer := net.Dialer{Timeout: 2 * time.Second}
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conn, err := dialer.Dial("tcp", hostnamePort)
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if err != nil {
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channel <- RedisCmd{Error: fmt.Errorf(RedisUnreachable)}
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return
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}
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defer func() {
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if err := conn.Close(); err != nil {
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fmt.Printf("redis:connClose %s", err.Error())
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}
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}()
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writer := textproto.NewWriter(bufio.NewWriter(conn))
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reader := textproto.NewReader(bufio.NewReader(conn))
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switch cmd.Command {
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case "SET":
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data := genRedisArray([]byte("SET"), []byte(cmd.Name), cmd.Data, []byte("EX"), []byte(fmt.Sprintf("%d", cmd.Duration)))
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send(writer, "set", data)
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case "DEL":
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data := genRedisArray([]byte("DEL"), []byte(cmd.Name))
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send(writer, "del", data)
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case "GET":
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data := genRedisArray([]byte("GET"), []byte(cmd.Name))
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send(writer, "get", data)
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for {
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select {
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case <-time.After(time.Second * 1):
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channel <- RedisCmd{Error: fmt.Errorf(RedisTimeout)}
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return
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default:
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read, _ := reader.ReadLineBytes()
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if string(read) != "$1" {
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channel <- RedisCmd{Error: fmt.Errorf(RedisMiss)}
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return
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}
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read, _ = reader.ReadLineBytes()
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channel <- RedisCmd{Data: read}
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return
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}
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}
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}
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}
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// Init sets the redisHost used to connect to redis.
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func (sr *SimpleRedis) Init(redisHost string) {
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sr.redisHost = redisHost
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}
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// Get fetches the value for key name in redis.
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func (sr *SimpleRedis) Get(name string) ([]byte, error) {
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redisCmd := RedisCmd{
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Command: "GET",
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Name: name,
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}
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channel := make(chan RedisCmd)
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go askRedis(sr.redisHost, redisCmd, channel)
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resp := <-channel
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if resp.Error != nil {
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return nil, resp.Error
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}
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return resp.Data, nil
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}
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// Set updates the value for key name in redis with value data for duration.
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func (sr *SimpleRedis) Set(name string, data []byte, duration int64) error {
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redisCmd := RedisCmd{
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Command: "SET",
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Name: name,
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Data: data,
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Duration: duration,
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}
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go askRedis(sr.redisHost, redisCmd, nil)
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return nil
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}
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// Del removes the key name in redis.
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func (sr *SimpleRedis) Del(name string) error {
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redisCmd := RedisCmd{
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Command: "DEL",
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Name: name,
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}
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go askRedis(sr.redisHost, redisCmd, nil)
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return nil
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}
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