Add info command (#141)

* Generate a new runid for each start of godis

* Add info command

* Add info command

* Generate a new runid for each start of godis

* Add unittests for the info command

config/config.go

@@ -2,17 +2,26 @@ package config
 
 import (
 	"bufio"
+	"github.com/hdt3213/godis/lib/utils"
 	"io"
 	"os"
 	"reflect"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/hdt3213/godis/lib/logger"
 )
 
+var (
+	ClusterMode    = "cluster"
+	StandaloneMode = "standalone"
+)
+
 // ServerProperties defines global config properties
 type ServerProperties struct {
+	// for Public configuration
+	RunID             string `cfg:"runid"` // runID always different at every exec.
 	Bind              string `cfg:"bind"`
 	Port              int    `cfg:"port"`
 	AppendOnly        bool   `cfg:"appendonly"`
@@ -27,19 +36,36 @@ type ServerProperties struct {
 	SlaveAnnounceIP   string `cfg:"slave-announce-ip"`
 	ReplTimeout       int    `cfg:"repl-timeout"`
 
+	// for cluster mode configuration
+	ClusterEnabled string   `cfg:"cluster-enabled"` // Not used at present.
 	Peers          []string `cfg:"peers"`
 	Self           string   `cfg:"self"`
+
+	// config file path
+	CfPath string `cfg:"cf,omitempty"`
+}
+
+type ServerInfo struct {
+	StartUpTime time.Time
 }
 
 // Properties holds global config properties
 var Properties *ServerProperties
 
+var EachTimeServerInfo *ServerInfo
+
 func init() {
+	// A few stats we don't want to reset: server startup time, and peak mem.
+	EachTimeServerInfo = &ServerInfo{
+		StartUpTime: time.Now(),
+	}
+
 	// default config
 	Properties = &ServerProperties{
 		Bind:       "127.0.0.1",
 		Port:       6379,
 		AppendOnly: false,
+		RunID:      utils.RandString(40),
 	}
 }
 
@@ -109,4 +135,5 @@ func SetupConfig(configFilename string) {
 	}
 	defer file.Close()
 	Properties = parse(file)
+	Properties.RunID = utils.RandString(40)
 }

database/server.go

@@ -17,6 +17,8 @@ import (
 	"time"
 )
 
+var godisVersion = "1.2.8" // do not modify
+
 // Server is a redis-server with full capabilities including multiple database, rdb loader, replication
 type Server struct {
 	dbSet []*atomic.Value // *DB
@@ -90,6 +92,10 @@ func (server *Server) Exec(c redis.Connection, cmdLine [][]byte) (result redis.R
 	if cmdName == "auth" {
 		return Auth(c, cmdLine[1:])
 	}
+	// info
+	if cmdName == "info" {
+		return Info(c, cmdLine)
+	}
 	if !isAuthenticated(c) {
 		return protocol.MakeErrReply("NOAUTH Authentication required")
 	}

database/systemcmd.go

@@ -1,9 +1,14 @@
 package database
 
 import (
+	"fmt"
 	"github.com/hdt3213/godis/config"
 	"github.com/hdt3213/godis/interface/redis"
 	"github.com/hdt3213/godis/redis/protocol"
+	"os"
+	"runtime"
+	"strings"
+	"time"
 )
 
 // Ping the server
@@ -17,6 +22,24 @@ func Ping(c redis.Connection, args [][]byte) redis.Reply {
 	}
 }
 
+// Info the information of the godis server returned by the INFO command
+func Info(c redis.Connection, args [][]byte) redis.Reply {
+	if len(args) == 1 {
+		return protocol.MakeBulkReply(GenGodisInfoString())
+	} else if len(args) == 2 {
+		section := strings.ToLower(string(args[1]))
+		switch section {
+		case "server":
+			reply := GenGodisInfoString()
+			return protocol.MakeBulkReply(reply)
+		}
+	} else {
+		return protocol.MakeErrReply("ERR wrong number of arguments for 'info' command")
+	}
+
+	return &protocol.NullBulkReply{}
+}
+
 // Auth validate client's password
 func Auth(c redis.Connection, args [][]byte) redis.Reply {
 	if len(args) != 1 {
@@ -39,3 +62,57 @@ func isAuthenticated(c redis.Connection) bool {
 	}
 	return c.GetPassword() == config.Properties.RequirePass
 }
+
+func GenGodisInfoString() []byte {
+	startUpTimeFromNow := getGodisRuninngTime()
+	s := fmt.Sprintf("# Server\r\n"+
+		"godis_version:%s\r\n"+
+		//"godis_git_sha1:%s\r\n"+
+		//"godis_git_dirty:%d\r\n"+
+		//"godis_build_id:%s\r\n"+
+		"godis_mode:%s\r\n"+
+		"os:%s %s\r\n"+
+		"arch_bits:%d\r\n"+
+		//"multiplexing_api:%s\r\n"+
+		"go_version:%s\r\n"+
+		"process_id:%d\r\n"+
+		"run_id:%s\r\n"+
+		"tcp_port:%d\r\n"+
+		"uptime_in_seconds:%d\r\n"+
+		"uptime_in_days:%d\r\n"+
+		//"hz:%d\r\n"+
+		//"lru_clock:%d\r\n"+
+		"config_file:%s\r\n",
+		godisVersion,
+		//TODO,
+		//TODO,
+		//TODO,
+		getGodisRunningMode(),
+		runtime.GOOS, runtime.GOARCH,
+		32<<(^uint(0)>>63),
+		//TODO,
+		runtime.Version(),
+		os.Getpid(),
+		config.Properties.RunID,
+		config.Properties.Port,
+		startUpTimeFromNow,
+		startUpTimeFromNow/time.Duration(3600*24),
+		//TODO,
+		//TODO,
+		config.Properties.CfPath)
+	return []byte(s)
+}
+
+// getGodisRunningMode return godis running mode
+func getGodisRunningMode() string {
+	if config.Properties.ClusterEnabled == "yes" {
+		return config.ClusterMode
+	} else {
+		return config.StandaloneMode
+	}
+}
+
+// getGodisRuninngTime return the running time of godis
+func getGodisRuninngTime() time.Duration {
+	return time.Since(config.EachTimeServerInfo.StartUpTime) / time.Second
+}

database/systemcmd_test.go

@@ -39,3 +39,17 @@ func TestAuth(t *testing.T) {
 	asserts.AssertStatusReply(t, ret, "OK")
 
 }
+
+func TestInfo(t *testing.T) {
+	c := connection.NewFakeConn()
+	ret := testServer.Exec(c, utils.ToCmdLine("INFO"))
+	asserts.AssertNotError(t, ret)
+	ret = testServer.Exec(c, utils.ToCmdLine("INFO", "server"))
+	asserts.AssertNotError(t, ret)
+	ret = testServer.Exec(c, utils.ToCmdLine("iNFO", "SeRvEr"))
+	asserts.AssertNotError(t, ret)
+	ret = testServer.Exec(c, utils.ToCmdLine("iNFO", "abc", "bde"))
+	asserts.AssertErrReply(t, ret, "ERR wrong number of arguments for 'info' command")
+	ret = testServer.Exec(c, utils.ToCmdLine("INFO", "abc"))
+	asserts.AssertNullBulk(t, ret)
+}

main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/hdt3213/godis/config"
 	"github.com/hdt3213/godis/lib/logger"
+	"github.com/hdt3213/godis/lib/utils"
 	RedisServer "github.com/hdt3213/godis/redis/server"
 	"github.com/hdt3213/godis/tcp"
 	"os"
@@ -23,6 +24,7 @@ var defaultProperties = &config.ServerProperties{
 	AppendOnly:     false,
 	AppendFilename: "",
 	MaxClients:     1000,
+	RunID:          utils.RandString(40),
 }
 
 func fileExists(filename string) bool {