Added Error to decoded types.

Removed cmd_functions.go as it is replaced by plugin system.
Consolidated get and set plugins into one plugin setget that handles GET, SET and MGET commands.
Plugins can declare multiple commands that they handle.

server/plugins/commands/setget/setget.go

@@ -0,0 +1,128 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/kelvinmwinuka/memstore/utils"
+)
+
+type Server interface {
+	GetData(key string) interface{}
+	SetData(key string, value interface{})
+}
+
+type plugin struct {
+	name        string
+	commands    []string
+	description string
+}
+
+var Plugin plugin
+
+func (p *plugin) Name() string {
+	return p.name
+}
+
+func (p *plugin) Commands() []string {
+	return p.commands
+}
+
+func (p *plugin) Description() string {
+	return p.description
+}
+
+func (p *plugin) HandleCommand(cmd []string, server interface{}, conn *bufio.Writer) {
+	switch strings.ToLower(cmd[0]) {
+	case "get":
+		handleGet(cmd, server.(Server), conn)
+	case "set":
+		handleSet(cmd, server.(Server), conn)
+	case "mget":
+		handleMGet(cmd, server.(Server), conn)
+	}
+}
+
+func handleGet(cmd []string, s Server, conn *bufio.Writer) {
+
+	if len(cmd) != 2 {
+		conn.Write([]byte("-Error wrong number of args for GET command\r\n\n"))
+		conn.Flush()
+		return
+	}
+
+	value := s.GetData(cmd[1])
+
+	switch value.(type) {
+	default:
+		fmt.Println("Error. The requested object's type cannot be returned with the GET command")
+	case nil:
+		conn.Write([]byte("+nil\r\n\n"))
+	case string:
+		conn.Write([]byte(fmt.Sprintf("+%s\r\n\n", value)))
+	case float64:
+		conn.Write([]byte(fmt.Sprintf("+%f\r\n\n", value)))
+	case int:
+		conn.Write([]byte(fmt.Sprintf("+%d\r\n\n", value)))
+	}
+
+	conn.Flush()
+}
+
+func handleMGet(cmd []string, s Server, conn *bufio.Writer) {
+	vals := []string{}
+
+	for _, key := range cmd[1:] {
+		switch s.GetData(key).(type) {
+		case nil:
+			vals = append(vals, "nil")
+		case string:
+			vals = append(vals, fmt.Sprintf("%s", s.GetData(key)))
+		case float64:
+			vals = append(vals, fmt.Sprintf("%f", s.GetData(key)))
+		case int:
+			vals = append(vals, fmt.Sprintf("%d", s.GetData(key)))
+		}
+	}
+
+	conn.Write([]byte(fmt.Sprintf("*%d\r\n", len(vals))))
+
+	for _, val := range vals {
+		conn.Write([]byte(fmt.Sprintf("$%d\r\n%s\r\n", len(val), val)))
+	}
+
+	conn.Write([]byte("\n"))
+	conn.Flush()
+}
+
+func handleSet(cmd []string, s Server, conn *bufio.Writer) {
+	switch x := len(cmd); {
+	default:
+		conn.Write([]byte("-Error wrong number of args for SET command\r\n\n"))
+		conn.Flush()
+	case x > 3:
+		s.SetData(cmd[1], strings.Join(cmd[2:], " "))
+		conn.Write([]byte("+OK\r\n"))
+	case x == 3:
+		val, err := strconv.ParseFloat(cmd[2], 32)
+
+		if err != nil {
+			s.SetData(cmd[1], cmd[2])
+		} else if !utils.IsInteger(val) {
+			s.SetData(cmd[1], val)
+		} else {
+			s.SetData(cmd[1], int(val))
+		}
+
+		conn.Write([]byte("+OK\r\n\n"))
+		conn.Flush()
+	}
+}
+
+func init() {
+	Plugin.name = "GetCommand"
+	Plugin.commands = []string{"set", "get", "mget"}
+	Plugin.description = "Handle basic SET, GET and MGET commands"
+}