Add redis support for distributed caching

vendor/github.com/alicebob/miniredis/v2/cmd_client.go

@@ -0,0 +1,68 @@
+package miniredis
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/alicebob/miniredis/v2/server"
+)
+
+// commandsClient handles client operations.
+func commandsClient(m *Miniredis) {
+	m.srv.Register("CLIENT", m.cmdClient)
+}
+
+// CLIENT
+func (m *Miniredis) cmdClient(c *server.Peer, cmd string, args []string) {
+	if len(args) == 0 {
+		setDirty(c)
+		c.WriteError("ERR wrong number of arguments for 'client' command")
+		return
+	}
+
+	withTx(m, c, func(c *server.Peer, ctx *connCtx) {
+		switch cmd := strings.ToUpper(args[0]); cmd {
+		case "SETNAME":
+			m.cmdClientSetName(c, args[1:])
+		case "GETNAME":
+			m.cmdClientGetName(c, args[1:])
+		default:
+			setDirty(c)
+			c.WriteError(fmt.Sprintf("ERR unknown subcommand '%s'. Try CLIENT HELP.", cmd))
+		}
+	})
+}
+
+// CLIENT SETNAME
+func (m *Miniredis) cmdClientSetName(c *server.Peer, args []string) {
+	if len(args) != 1 {
+		setDirty(c)
+		c.WriteError("ERR wrong number of arguments for 'client setname' command")
+		return
+	}
+
+	name := args[0]
+	if strings.ContainsAny(name, " \n") {
+		setDirty(c)
+		c.WriteError("ERR Client names cannot contain spaces, newlines or special characters.")
+		return
+
+	}
+	c.ClientName = name
+	c.WriteOK()
+}
+
+// CLIENT GETNAME
+func (m *Miniredis) cmdClientGetName(c *server.Peer, args []string) {
+	if len(args) > 0 {
+		setDirty(c)
+		c.WriteError("ERR wrong number of arguments for 'client getname' command")
+		return
+	}
+
+	if c.ClientName == "" {
+		c.WriteNull()
+	} else {
+		c.WriteBulk(c.ClientName)
+	}
+}