use connection pool within peers in cluster mode

README.md

@@ -4,6 +4,10 @@
 
 Please be advised, NEVER think about using this in production environment.
 
+This repository implemented most features of redis, including 5 data structures, ttl, publish/subscribe and AOF persistence.
+
+If you could read Chinese, you can find more details in [My Blog](https://www.cnblogs.com/Finley/category/1598973.html).
+
 ## Running
 
 You can get runnable program in the releases of this repository, which supports Linux and Darwin system.
@@ -12,14 +16,16 @@ You can get runnable program in the releases of this repository, which supports
 ./godis-darwin
 ```
 
-The program will try to read `redis.conf` in the working directory. If there is no such file, then the program will run with default config.
+You could use redis-cli or other redis client to connect godis server, which listens on 127.0.0.1:6379 on default mode.
+
+The program will try to read config file path from environment variable `CONFIG`.
+
+If environment variable is not set, then the program  try to read `redis.conf` in the working directory. 
+
+If there is no such file, then the program will run with default config.
 
 ## Commands
 
-This repository implemented most of features of redis, including 5 kind of data structures, ttl, publish/subscribe and AOF persistence.
-
-If you could read Chinese, you can find more details in [My Blog](https://www.cnblogs.com/Finley/category/1598973.html).
-
 Supported Commands:
 
 - Keys

go.mod

@@ -2,4 +2,8 @@ module github.com/HDT3213/godis
 
 go 1.12
 
-require github.com/shopspring/decimal v1.2.0
+require (
+	github.com/jolestar/go-commons-pool v2.0.0+incompatible // indirect
+	github.com/jolestar/go-commons-pool/v2 v2.1.1
+	github.com/shopspring/decimal v1.2.0
+)

go.sum

@@ -1,2 +1,15 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
+github.com/jolestar/go-commons-pool v2.0.0+incompatible h1:uHn5uRKsLLQSf9f1J5QPY2xREWx/YH+e4bIIXcAuAaE=
+github.com/jolestar/go-commons-pool v2.0.0+incompatible/go.mod h1:ChJYIbIch0DMCSU6VU0t0xhPoWDR2mMFIQek3XWU0s8=
+github.com/jolestar/go-commons-pool/v2 v2.1.1 h1:KrbCEvx5KhwcHzLTWIE8SJJQL7zzNto5in+wnO9/gSA=
+github.com/jolestar/go-commons-pool/v2 v2.1.1/go.mod h1:kTOzcguO2zUoEd+BySdg7Xhk/YE0HEr2bAHdWDkhMXg=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/shopspring/decimal v1.2.0 h1:abSATXmQEYyShuxI4/vyW3tV1MrKAJzCZ/0zLUXYbsQ=
 github.com/shopspring/decimal v1.2.0/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

node1.conf

@@ -0,0 +1,9 @@
+bind 0.0.0.0
+port 6399
+maxclients 128
+
+appendonly no
+appendfilename appendonly.aof
+
+peers localhost:7379
+self  localhost:6399

node2.conf

@@ -0,0 +1,9 @@
+bind 0.0.0.0
+port 7379
+maxclients 128
+
+appendonly no
+appendfilename appendonly.aof
+
+peers localhost:6399
+self  localhost:7379

redis.conf

@@ -4,6 +4,3 @@ maxclients 128
 
 appendonly no
 appendfilename appendonly.aof
-
-# peers localhost:7379
-self  localhost:6399

src/cluster/client.go

@@ -1,307 +1,45 @@
 package cluster
 
 import (
-    "bufio"
     "context"
     "errors"
-    "github.com/HDT3213/godis/src/cluster/idgenerator"
+    "github.com/HDT3213/godis/src/redis/client"
-    "github.com/HDT3213/godis/src/interface/redis"
+    "github.com/jolestar/go-commons-pool/v2"
-    "github.com/HDT3213/godis/src/lib/logger"
-    "github.com/HDT3213/godis/src/lib/sync/wait"
-    "github.com/HDT3213/godis/src/redis/reply"
-    "io"
-    "net"
-    "strconv"
-    "sync"
-    "time"
 )
 
-const (
+type ConnectionFactory struct {
-    timeout = 2 * time.Second
+    Peer string
-    CRLF    = "\r\n"
-)
-
-type InternalClient struct {
-    idGen       *idgenerator.IdGenerator
-    conn        net.Conn
-    sendingReqs chan *AsyncRequest
-    ticker      *time.Ticker
-    addr        string
-    waitingMap  *sync.Map // key -> request
-
-    ctx        context.Context
-    cancelFunc context.CancelFunc
-    writing    *sync.WaitGroup
 }
 
-type AsyncRequest struct {
+func (f *ConnectionFactory) MakeObject(ctx context.Context) (*pool.PooledObject, error) {
-    id        int64
+    c, err := client.MakeClient(f.Peer)
-    args      [][]byte
-    reply     redis.Reply
-    heartbeat bool
-    waiting   *wait.Wait
-}
-
-type AsyncMultiBulkReply struct {
-    Args [][]byte
-}
-
-func MakeAsyncMultiBulkReply(args [][]byte) *AsyncMultiBulkReply {
-    return &AsyncMultiBulkReply{
-        Args: args,
-    }
-}
-
-func (r *AsyncMultiBulkReply) ToBytes() []byte {
-    argLen := len(r.Args)
-    res := "@" + strconv.Itoa(argLen) + CRLF
-    for _, arg := range r.Args {
-        if arg == nil {
-            res += "$-1" + CRLF
-        } else {
-            res += "$" + strconv.Itoa(len(arg)) + CRLF + string(arg) + CRLF
-        }
-    }
-    return []byte(res)
-}
-
-func MakeInternalClient(addr string, idGen *idgenerator.IdGenerator) (*InternalClient, error) {
-    conn, err := net.Dial("tcp", addr)
     if err != nil {
         return nil, err
     }
-    ctx, cancel := context.WithCancel(context.Background())
+    c.Start()
-    return &InternalClient{
+    return pool.NewPooledObject(c), nil
-        addr:        addr,
-        conn:        conn,
-        sendingReqs: make(chan *AsyncRequest, 256),
-        waitingMap:  &sync.Map{},
-
-        ctx:        ctx,
-        cancelFunc: cancel,
-        writing:    &sync.WaitGroup{},
-        idGen:      idGen,
-    }, nil
 }
 
-func (client *InternalClient) Start() {
+func (f *ConnectionFactory) DestroyObject(ctx context.Context, object *pool.PooledObject) error {
-    client.ticker = time.NewTicker(10 * time.Second)
+    c, ok := object.Object.(*client.Client)
-    go client.handleWrite()
-    go func() {
-        err := client.handleRead()
-        logger.Warn(err)
-    }()
-    go client.heartbeat()
-}
-
-func (client *InternalClient) Close() {
-    // send stop signal
-    client.cancelFunc()
-
-    // wait stop process
-    client.writing.Wait()
-
-    // clean
-    _ = client.conn.Close()
-    close(client.sendingReqs)
-}
-
-func (client *InternalClient) handleConnectionError(err error) error {
-    err1 := client.conn.Close()
-    if err1 != nil {
-        if opErr, ok := err1.(*net.OpError); ok {
-            if opErr.Err.Error() != "use of closed network connection" {
-                return err1
-            }
-        } else {
-            return err1
-        }
-    }
-    conn, err1 := net.Dial("tcp", client.addr)
-    if err1 != nil {
-        logger.Error(err1)
-        return err1
-    }
-    client.conn = conn
-    go func() {
-        _ = client.handleRead()
-    }()
-    return nil
-}
-
-func (client *InternalClient) heartbeat() {
-loop:
-    for {
-        select {
-        case <-client.ticker.C:
-            client.sendingReqs <- &AsyncRequest{
-                args:      [][]byte{[]byte("PING")},
-                heartbeat: true,
-            }
-        case <-client.ctx.Done():
-            break loop
-        }
-    }
-}
-
-func (client *InternalClient) handleWrite() {
-    client.writing.Add(1)
-loop:
-    for {
-        select {
-        case req := <-client.sendingReqs:
-            client.doRequest(req)
-        case <-client.ctx.Done():
-            break loop
-        }
-    }
-    client.writing.Done()
-}
-
-func (client *InternalClient) Send(args [][]byte) redis.Reply {
-    request := &AsyncRequest{
-        id:        client.idGen.NextId(),
-        args:      args,
-        heartbeat: false,
-        waiting:   &wait.Wait{},
-    }
-    request.waiting.Add(1)
-    client.sendingReqs <- request
-    client.waitingMap.Store(request.id, request)
-    timeUp := request.waiting.WaitWithTimeout(timeout)
-    if timeUp {
-        client.waitingMap.Delete(request.id)
-        return nil
-    } else {
-        return request.reply
-    }
-}
-
-func (client *InternalClient) doRequest(req *AsyncRequest) {
-    bytes := reply.MakeMultiBulkReply(req.args).ToBytes()
-    _, err := client.conn.Write(bytes)
-    i := 0
-    for err != nil && i < 3 {
-        err = client.handleConnectionError(err)
-        if err == nil {
-            _, err = client.conn.Write(bytes)
-        }
-        i++
-    }
-}
-
-func (client *InternalClient) finishRequest(reply *AsyncMultiBulkReply) {
-    if reply == nil || reply.Args == nil || len(reply.Args) == 0 {
-        return
-    }
-    reqId, err := strconv.ParseInt(string(reply.Args[0]), 10, 64)
-    if err != nil {
-        logger.Warn(err)
-        return
-    }
-    raw, ok := client.waitingMap.Load(reqId)
     if !ok {
-        return
+        return errors.New("type mismatch")
-    }
-    request := raw.(*AsyncRequest)
-    request.reply = reply
-    if request.waiting != nil {
-        request.waiting.Done()
     }
+    c.Close()
+    return nil
 }
 
-func (client *InternalClient) handleRead() error {
+func (f *ConnectionFactory) ValidateObject(ctx context.Context, object *pool.PooledObject) bool {
-    reader := bufio.NewReader(client.conn)
+    // do validate
-    downloading := false
+    return true
-    expectedArgsCount := 0
+}
-    receivedCount := 0
+
-    var args [][]byte
+func (f *ConnectionFactory) ActivateObject(ctx context.Context, object *pool.PooledObject) error {
-    var fixedLen int64 = 0
+    // do activate
-    var err error
+    return nil
-    var msg []byte
+}
-    for {
+
-        // read line
+func (f *ConnectionFactory) PassivateObject(ctx context.Context, object *pool.PooledObject) error {
-        if fixedLen == 0 { // read normal line
+    // do passivate
-            msg, err = reader.ReadBytes('\n')
+    return nil
-            if err != nil {
-                if err == io.EOF || err == io.ErrUnexpectedEOF {
-                    logger.Info("connection close")
-                } else {
-                    logger.Warn(err)
-                }
-
-                return errors.New("connection closed")
-            }
-            if len(msg) == 0 || msg[len(msg)-2] != '\r' {
-                return errors.New("protocol error")
-            }
-        } else { // read bulk line (binary safe)
-            msg = make([]byte, fixedLen+2)
-            _, err = io.ReadFull(reader, msg)
-            if err != nil {
-                if err == io.EOF || err == io.ErrUnexpectedEOF {
-                    return errors.New("connection closed")
-                } else {
-                    return err
-                }
-            }
-            if len(msg) == 0 ||
-                msg[len(msg)-2] != '\r' ||
-                msg[len(msg)-1] != '\n' {
-                return errors.New("protocol error")
-            }
-            fixedLen = 0
-        }
-
-        // parse line
-        if !downloading {
-            // receive new response
-            if msg[0] == '@' { // customized multi bulk response
-                // bulk multi msg
-                expectedLine, err := strconv.ParseUint(string(msg[1:len(msg)-2]), 10, 32)
-                if err != nil {
-                    return errors.New("protocol error: " + err.Error())
-                }
-                if expectedLine == 0 {
-                    client.finishRequest(nil)
-                } else if expectedLine > 0 {
-                    downloading = true
-                    expectedArgsCount = int(expectedLine)
-                    receivedCount = 0
-                    args = make([][]byte, expectedLine)
-                } else {
-                    return errors.New("protocol error")
-                }
-            }
-        } else {
-            // receive following part of a request
-            line := msg[0 : len(msg)-2]
-            if line[0] == '$' {
-                fixedLen, err = strconv.ParseInt(string(line[1:]), 10, 64)
-                if err != nil {
-                    return err
-                }
-                if fixedLen <= 0 { // null bulk in multi bulks
-                    args[receivedCount] = []byte{}
-                    receivedCount++
-                    fixedLen = 0
-                }
-            } else {
-                args[receivedCount] = line
-                receivedCount++
-            }
-
-            // if sending finished
-            if receivedCount == expectedArgsCount {
-                downloading = false // finish downloading progress
-
-                client.finishRequest(&AsyncMultiBulkReply{Args: args})
-
-                // finish reply
-                expectedArgsCount = 0
-                receivedCount = 0
-                args = nil
-            }
-        }
-    }
 }

src/cluster/cluster.go

@@ -1,6 +1,8 @@
 package cluster
 
 import (
+    "context"
+    "errors"
     "fmt"
     "github.com/HDT3213/godis/src/cluster/idgenerator"
     "github.com/HDT3213/godis/src/config"
@@ -11,6 +13,7 @@ import (
     "github.com/HDT3213/godis/src/lib/logger"
     "github.com/HDT3213/godis/src/redis/client"
     "github.com/HDT3213/godis/src/redis/reply"
+    "github.com/jolestar/go-commons-pool/v2"
     "runtime/debug"
     "strings"
 )
@@ -19,7 +22,7 @@ type Cluster struct {
     self string
 
     peerPicker     *consistenthash.Map
-    peers      map[string]*client.Client
+    peerConnection map[string]*pool.ObjectPool
 
     db           *db.DB
     transactions *dict.SimpleDict // id -> Transaction
@@ -39,7 +42,7 @@ func MakeCluster() *Cluster {
         db:             db.MakeDB(),
         transactions:   dict.MakeSimple(),
         peerPicker:     consistenthash.New(replicas, nil),
-        peers:        make(map[string]*client.Client),
+        peerConnection: make(map[string]*pool.ObjectPool),
 
         idGenerator: idgenerator.MakeGenerator("godis", config.Properties.Self),
     }
@@ -55,6 +58,12 @@ func MakeCluster() *Cluster {
         }
         peers = append(peers, config.Properties.Self)
         cluster.peerPicker.Add(peers...)
+        ctx := context.Background()
+        for _, peer := range peers {
+            cluster.peerConnection[peer] = pool.NewObjectPoolWithDefaultConfig(ctx, &ConnectionFactory{
+                Peer: peer,
+            })
+        }
     }
     return cluster
 }
@@ -90,18 +99,27 @@ func (cluster *Cluster) AfterClientClose(c redis.Connection) {
 }
 
 func (cluster *Cluster) getPeerClient(peer string) (*client.Client, error) {
-    peerClient, ok := cluster.peers[peer]
+    connectionFactory, ok := cluster.peerConnection[peer]
-    // lazy init
     if !ok {
-        var err error
+        return nil, errors.New("connection factory not found")
-        peerClient, err = client.MakeClient(peer)
+    }
+    raw, err := connectionFactory.BorrowObject(context.Background())
     if err != nil {
         return nil, err
     }
-        peerClient.Start()
+    conn, ok := raw.(*client.Client)
-        cluster.peers[peer] = peerClient
+    if !ok {
+        return nil, errors.New("connection factory make wrong type")
     }
-    return peerClient, nil
+    return conn, nil
+}
+
+func (cluster *Cluster) returnPeerClient(peer string, peerClient *client.Client) error {
+    connectionFactory, ok := cluster.peerConnection[peer]
+    if !ok {
+        return errors.New("connection factory not found")
+    }
+    return connectionFactory.ReturnObject(context.Background(), peerClient)
 }
 
 func Ping(cluster *Cluster, c redis.Connection, args [][]byte) redis.Reply {
@@ -125,6 +143,9 @@ func (cluster *Cluster) Relay(peer string, c redis.Connection, args [][]byte) re
         if err != nil {
             return reply.MakeErrReply(err.Error())
         }
+        defer func() {
+            _ = cluster.returnPeerClient(peer, peerClient)
+        }()
         return peerClient.Send(args)
     }
 }

src/cluster/mset.go

@@ -10,7 +10,7 @@ import (
 
 func MGet(cluster *Cluster, c redis.Connection, args [][]byte) redis.Reply {
     if len(args) < 2 {
-        return reply.MakeErrReply("ERR wrong number of arguments for 'del' command")
+        return reply.MakeErrReply("ERR wrong number of arguments for 'mget' command")
     }
     keys := make([]string, len(args)-1)
     for i := 1; i < len(args); i++ {

src/cmd/main.go

@@ -6,10 +6,15 @@ import (
 	"github.com/HDT3213/godis/src/lib/logger"
     RedisServer "github.com/HDT3213/godis/src/redis/server"
 	"github.com/HDT3213/godis/src/tcp"
+	"os"
 )
 
 func main() {
-	config.SetupConfig("redis.conf")
+	configFilename := os.Getenv("CONFIG")
+	if configFilename == "" {
+		configFilename = "redis.conf"
+	}
+	config.SetupConfig(configFilename)
 	logger.Setup(&logger.Settings{
 		Path:       "logs",
 		Name:       "godis",