command: select, flushall (#32)

The Redis WordPress plugin (wp-redis) uses SELECT to connect to a database.
Older versions of this plugin (<0.8.0) also use FLUSHALL instead of FLUSHDB
to flush the cache.

See https://github.com/pantheon-systems/wp-redis

internal/command/command.go

@@ -28,6 +28,8 @@ func Parse(args [][]byte) (redis.Cmd, error) {
  return server.ParseDBSize(b)
  case "flushdb":
  return key.ParseFlushDB(b)
+ case "flushall":
+ return key.ParseFlushDB(b)
  case "info":
  return server.ParseOK(b)
  case "lolwut":
@@ -38,6 +40,8 @@ func Parse(args [][]byte) (redis.Cmd, error) {
  return conn.ParseEcho(b)
  case "ping":
  return conn.ParsePing(b)
+ case "select":
+ return conn.ParseSelect(b)
 
  // key
  case "del":

internal/command/conn/select.go

@@ -0,0 +1,33 @@
+package conn
+
+import (
+ "github.com/nalgeon/redka/internal/parser"
+ "github.com/nalgeon/redka/internal/redis"
+)
+
+const (
+ RESPONSE = "OK"
+)
+
+// Returns the server's liveliness response.
+// https://redis.io/commands/select
+type Select struct {
+ redis.BaseCmd
+ index int
+}
+
+func ParseSelect(b redis.BaseCmd) (Select, error) {
+ cmd := Select{BaseCmd: b}
+ err := parser.New(
+ parser.Int(&cmd.index),
+ ).Required(1).Run(cmd.Args())
+ if err != nil {
+ return Select{}, err
+ }
+ return cmd, nil
+}
+
+func (c Select) Run(w redis.Writer, _ redis.Redka) (any, error) {
+ w.WriteBulkString(RESPONSE)
+ return RESPONSE, nil
+}