forked from mkabilov/pg2ch
/
redis.go
92 lines (84 loc) · 2.27 KB
/
redis.go
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package replicator
import (
"fmt"
"strings"
"github.com/tidwall/redcon"
"github.com/mkabilov/pg2ch/pkg/config"
)
func (r *Replicator) startRedisServer() {
r.logger.Infof("starting redis-like server: %v", r.cfg.RedisBind)
redisServer := redcon.NewServer(r.cfg.RedisBind,
func(conn redcon.Conn, cmd redcon.Command) {
switch strings.ToLower(string(cmd.Args[0])) {
case "ping":
conn.WriteString("PONG")
case "quit":
conn.WriteString("OK")
if err := conn.Close(); err != nil {
r.logger.Warnf("could not close redis connection: %v", err)
}
case "lsn":
conn.WriteString(fmt.Sprintf("last final LSN: %v", r.consumer.CurrentLSN().String()))
case "get":
if len(cmd.Args) != 2 {
conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
return
}
key := config.TableLSNKeyPrefix + string(cmd.Args[1])
lsn, err := r.persStorage.ReadLSN(key)
if err != nil {
conn.WriteNull()
} else {
conn.WriteString(lsn.String())
}
case "keys":
for _, key := range r.persStorage.Keys() {
if !strings.HasPrefix(key, config.TableLSNKeyPrefix) {
continue
}
conn.WriteString(key[len(config.TableLSNKeyPrefix):])
}
conn.WriteString("OK")
case "exists":
if len(cmd.Args) != 2 {
conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
return
}
key := string(cmd.Args[1])
if r.persStorage.Has(key) {
conn.WriteInt(1)
} else {
conn.WriteInt(0)
}
case "del":
if len(cmd.Args) != 2 {
conn.WriteError("ERR wrong number of arguments for '" + string(cmd.Args[0]) + "' command")
return
}
key := string(cmd.Args[1])
err := r.persStorage.Erase(key)
if err != nil {
conn.WriteInt(0)
} else {
conn.WriteInt(1)
}
case "pause":
conn.WriteString(r.pause())
case "resume":
conn.WriteString(r.resume())
case "status":
conn.WriteString(r.curState.String())
default:
conn.WriteError("ERR unknown command '" + string(cmd.Args[0]) + "'")
}
},
func(conn redcon.Conn) bool { return true },
func(conn redcon.Conn, err error) {},
)
if err := redisServer.ListenAndServe(); err != nil {
select {
case r.errCh <- err:
default:
}
}
}