The worker can be working now.

--HG--
branch : 0.1

example/worker.go

@@ -1,25 +1,37 @@
 package main
 
 import (
-    "bitbucket.org/mikespook/gearman-go/worker"
+    "os"
-//    "bitbucket.org/mikespook/golib/signal"
-//    "os"
     "log"
     "strings"
+    "bitbucket.org/mikespook/golib/signal"
+    "bitbucket.org/mikespook/gearman-go/worker"
 )
 
 func ToUpper(job *worker.Job) ([]byte, error) {
+    log.Printf("Handle=[%s]; UID=[%s], Data=[%s]\n",
+        job.Handle, job.UniqueId, job.Data)
     data := []byte(strings.ToUpper(string(job.Data)))
     return data, nil
 }
 
 func main() {
+    log.Println("Starting ...")
+    defer log.Println("Shutdown complete!")
     w := worker.New(worker.Unlimited)
     w.ErrHandler = func(e error) {
         log.Println(e)
     }
-    w.AddServer("127.0.0.1:4730")
+    w.JobHandler = func(job *worker.Job) error {
-    w.AddFunction("ToUpper", ToUpper, 0)
+        log.Printf("H=%s, UID=%s, Data=%s\n", job.Handle,
-    w.AddFunction("ToUpperTimeOut5", ToUpper, 5)
+            job.UniqueId, job.Data)
-    w.Work()
+        return nil
+    }
+    w.AddServer("127.0.0.1:4730")
+    w.AddFunc("ToUpper", ToUpper, 0)
+    //w.AddFunc("ToUpperTimeOut5", ToUpper, 5)
+    go w.Work()
+    sh := signal.NewHandler()
+    sh.Bind(os.Interrupt, func() bool {return true})
+    sh.Loop()
 }

worker/agent.go

@@ -11,43 +11,102 @@ import (
 )
 
 // The agent of job server.
-type jobAgent struct {
+type agent struct {
     conn        net.Conn
     worker      *Worker
-    running  bool
     in chan     []byte
     out chan    *Job
 }
 
 // Create the agent of job server.
-func newJobAgent(addr string, worker *Worker) (jobagent *jobAgent, err error) {
+func newAgent(addr string, worker *Worker) (a *agent, err error) {
     conn, err := net.Dial(common.NETWORK, addr)
     if err != nil {
-        return nil, err
+        return
     }
-    jobagent = &jobAgent{
+    a = &agent{
         conn: conn,
         worker: worker,
-        running: true,
         in: make(chan []byte, common.QUEUE_SIZE),
+        out: make(chan *Job, common.QUEUE_SIZE),
     }
-    return jobagent, err
+    return
+}
+
+// outputing loop
+func (a *agent) outLoop() {
+    ok := true
+    for ok {
+        if job, ok := <-a.out; ok {
+            if err := a.write(job.Encode()); err != nil {
+                a.worker.err(err)
+            }
+        }
+    }
+}
+
+// inputing loop
+func (a *agent) inLoop() {
+    defer func() {
+        a.conn.Close()
+        close(a.in)
+        close(a.out)
+        a.worker.removeAgent(a)
+    }()
+    noop := true
+    for a.worker.running {
+        // got noop msg and in queue is zero, grab job
+        if noop && len(a.in) == 0 {
+            a.WriteJob(newJob(common.REQ, common.GRAB_JOB, nil))
+        }
+        rel, err := a.read()
+        if err != nil {
+            if err == common.ErrEmptyReading {
+                break
+            }
+            a.worker.err(err)
+            continue
+        }
+        job, err := decodeJob(rel)
+        if err != nil {
+            a.worker.err(err)
+            continue
+        }
+        switch job.DataType {
+        case common.NOOP:
+            noop = true
+        case common.NO_JOB:
+            noop = false
+            a.WriteJob(newJob(common.REQ, common.PRE_SLEEP, nil))
+        case common.ERROR, common.ECHO_RES, common.JOB_ASSIGN_UNIQ, common.JOB_ASSIGN:
+            job.agent = a
+            a.worker.in <- job
+        }
+    }
+}
+
+func (a *agent) Work() {
+    go a.outLoop()
+    go a.inLoop()
 }
 
 // Internal read
-func (agent *jobAgent) read() (data []byte, err error) {
+func (a *agent) read() (data []byte, err error) {
-    if len(agent.in) > 0 {
+    if len(a.in) > 0 {
         // in queue is not empty
-        data = <-agent.in
+        data = <-a.in
     } else {
         for {
             buf := make([]byte, common.BUFFER_SIZE)
             var n int
-            if n, err = agent.conn.Read(buf); err != nil {
+            if n, err = a.conn.Read(buf); err != nil {
                 if err == io.EOF && n == 0 {
-                    err = nil
+                    if data == nil {
+                        err = common.ErrEmptyReading
                         return
                     }
+                    break
+                }
                 return
             }
             data = append(data, buf[0:n]...)
@@ -57,16 +116,17 @@ func (agent *jobAgent) read() (data []byte, err error) {
         }
     }
     // split package
-    start := 0
     tl := len(data)
+    start := 0
     for i := 0; i < tl; i++ {
         if string(data[start:start+4]) == common.RES_STR {
-            l := int(common.BytesToUint32([4]byte{data[start+8], data[start+9], data[start+10], data[start+11]}))
+            l := int(common.BytesToUint32([4]byte{data[start+8],
+                data[start+9], data[start+10], data[start+11]}))
             total := l + 12
             if total == tl {
                 return
             } else {
-                agent.in <- data[total:]
+                a.in <- data[total:]
                 data = data[:total]
                 return
             }
@@ -74,64 +134,22 @@ func (agent *jobAgent) read() (data []byte, err error) {
             start++
         }
     }
-    err = common.ErrInvalidData
+    return nil, common.Errorf("Invalid data: %V", data)
-    return
-}
-
-// Main loop.
-func (agent *jobAgent) Work() {
-    noop := true
-    for agent.running {
-        // got noop msg and in queue is zero, grab job
-        if noop && len(agent.in) == 0 {
-            agent.WriteJob(newJob(common.REQ, common.GRAB_JOB, nil))
-        }
-        rel, err := agent.read()
-        if err != nil {
-            agent.worker.err(err)
-            continue
-        }
-        job, err := decodeJob(rel)
-        if err != nil {
-            agent.worker.err(err)
-            continue
-        } else {
-            switch job.DataType {
-            case common.NOOP:
-                noop = true
-            case common.NO_JOB:
-                noop = false
-                agent.WriteJob(newJob(common.REQ, common.PRE_SLEEP, nil))
-            case common.ECHO_RES, common.JOB_ASSIGN_UNIQ, common.JOB_ASSIGN:
-                job.agent = agent
-                agent.worker.in <- job
-            }
-        }
-    }
-    return
 }
 
 // Send a job to the job server.
-func (agent *jobAgent) WriteJob(job *Job) (err error) {
+func (a *agent) WriteJob(job *Job) {
-    return agent.write(job.Encode())
+    a.out <- job
 }
 
 // Internal write the encoded job.
-func (agent *jobAgent) write(buf []byte) (err error) {
+func (a *agent) write(buf []byte) (err error) {
     var n int
     for i := 0; i < len(buf); i += n {
-        n, err = agent.conn.Write(buf[i:])
+        n, err = a.conn.Write(buf[i:])
         if err != nil {
             return err
         }
     }
     return
 }
-
-// Close.
-func (agent *jobAgent) Close() (err error) {
-    agent.running = false
-    close(agent.in)
-    err = agent.conn.Close()
-    return
-}

worker/job.go

@@ -1,4 +1,5 @@
-// Copyright 2011 Xing Xing <mikespook@gmail.com> All rights reserved.
+// Copyright 2011 Xing Xing <mikespook@gmail.com> 
+// All rights reserved.
 // Use of this source code is governed by a MIT
 // license that can be found in the LICENSE file.
 
@@ -13,7 +14,7 @@ import (
 type Job struct {
     Data                []byte
     Handle, UniqueId    string
-    agent               *jobAgent
+    agent               *agent
     magicCode, DataType uint32
 }
 
@@ -27,14 +28,12 @@ func newJob(magiccode, datatype uint32, data []byte) (job *Job) {
 // Decode job from byte slice
 func decodeJob(data []byte) (job *Job, err error) {
     if len(data) < 12 {
-        err = common.ErrInvalidData
+        return nil, common.Errorf("Invalid data: %V", data)
-        return
     }
     datatype := common.BytesToUint32([4]byte{data[4], data[5], data[6], data[7]})
     l := common.BytesToUint32([4]byte{data[8], data[9], data[10], data[11]})
     if len(data[12:]) != int(l) {
-        err = common.ErrInvalidData
+        return nil, common.Errorf("Invalid data: %V", data)
-        return
     }
     data = data[12:]
     job = newJob(common.RES, datatype, data)
@@ -44,11 +43,11 @@ func decodeJob(data []byte) (job *Job, err error) {
 // Encode a job to byte slice
 func (job *Job) Encode() (data []byte) {
     l := len(job.Data)
-    tl := l + 12
+    tl := l
     if job.Handle != "" {
         tl += len(job.Handle) + 1
     }
-    data = make([]byte, 0, tl)
+    data = make([]byte, 0, tl + 12)
 
     magiccode := common.Uint32ToBytes(job.magicCode)
     datatype := common.Uint32ToBytes(job.DataType)
@@ -67,7 +66,7 @@ func (job *Job) Encode() (data []byte) {
 
 // Send some datas to client.
 // Using this in a job's executing.
-func (job *Job) UpdateData(data []byte, iswaring bool) (err error) {
+func (job *Job) UpdateData(data []byte, iswaring bool) {
     result := append([]byte(job.Handle), 0)
     result = append(result, data...)
     var datatype uint32
@@ -76,16 +75,16 @@ func (job *Job) UpdateData(data []byte, iswaring bool) (err error) {
     } else {
         datatype = common.WORK_DATA
     }
-    return job.agent.WriteJob(newJob(common.REQ, datatype, result))
+    job.agent.WriteJob(newJob(common.REQ, datatype, result))
 }
 
 // Update status.
 // Tall client how many percent job has been executed.
-func (job *Job) UpdateStatus(numerator, denominator int) (err error) {
+func (job *Job) UpdateStatus(numerator, denominator int) {
     n := []byte(strconv.Itoa(numerator))
     d := []byte(strconv.Itoa(denominator))
     result := append([]byte(job.Handle), 0)
     result = append(result, n...)
     result = append(result, d...)
-    return job.agent.WriteJob(newJob(common.REQ, common.WORK_STATUS, result))
+    job.agent.WriteJob(newJob(common.REQ, common.WORK_STATUS, result))
 }

worker/worker.go

@@ -13,12 +13,19 @@ const (
     Unlimited = 0
     OneByOne = 1
 )
+// Job handler
+type JobHandler func(*Job) error
 
-// The definition of the callback function.
 type JobFunc func(job *Job) ([]byte, error)
 
+// The definition of the callback function.
+type jobFunc struct {
+    f JobFunc
+    timeout uint32
+}
+
 // Map for added function.
-type JobFuncs map[string]JobFunc
+type JobFuncs map[string]*jobFunc
 
 /*
 Worker side api for gearman
@@ -39,27 +46,24 @@ func foobar(job *Job) (data []byte, err os.Error) {
 }
 */
 type Worker struct {
-    agents  []*jobAgent
+    agents  []*agent
     funcs   JobFuncs
     in chan *Job
-    out chan *Job
     running bool
     limit chan bool
 
     Id string
     // assign a ErrFunc to handle errors
     ErrHandler common.ErrorHandler
+    JobHandler JobHandler
 }
 
 // Get a new worker
 func New(l int) (worker *Worker) {
     worker = &Worker{
-        agents: make([]*jobAgent, 0),
+        agents: make([]*agent, 0),
-        functions: make(JobFunctionMap),
+        funcs: make(JobFuncs),
-
         in:  make(chan *Job, common.QUEUE_SIZE),
-        out:  make(chan *Job, common.QUEUE_SIZE),
-        running:   true,
     }
     if l != Unlimited {
         worker.limit = make(chan bool, l)
@@ -67,7 +71,6 @@ func New(l int) (worker *Worker) {
             worker.limit <- true
         }
     }
-    go worker.outLoop()
     return
 }
 
@@ -81,37 +84,42 @@ func (worker *Worker)err(e error) {
 // Add a server. The addr should be 'host:port' format.
 // The connection is established at this time.
 func (worker *Worker) AddServer(addr string) (err error) {
-    worker.mutex.Lock()
-    defer worker.mutex.Unlock()
-
-    if len(worker.clients) == cap(worker.clients) {
-        return common.ErrOutOfCap
-    }
-
     // Create a new job server's client as a agent of server
-    server, err := newJobAgent(addr, worker)
+    server, err := newAgent(addr, worker)
     if err != nil {
         return err
     }
-
+    worker.agents = append(worker.agents, server)
-    n := len(worker.clients)
-    worker.clients = worker.clients[0 : n+1]
-    worker.clients[n] = server
     return
 }
 
+// Write a job to job server.
+// Here, the job's mean is not the oraginal mean.
+// Just looks like a network package for job's result or tell job server, there was a fail.
+func (worker *Worker) broadcast(job *Job) {
+    for _, v := range worker.agents {
+        v.WriteJob(job)
+    }
+}
+
 // Add a function.
 // Plz added job servers first, then functions.
 // The API will tell every connected job server that 'I can do this'
-func (worker *Worker) AddFunction(funcname string,
+func (worker *Worker) AddFunc(funcname string,
 f JobFunc, timeout uint32) (err error) {
-    if len(worker.clients) < 1 {
+    if _, ok := worker.funcs[funcname]; ok {
-        return common.ErrNotConn
+        return common.Errorf("The function already exists: %s", funcname)
     }
-    worker.mutex.Lock()
+    worker.funcs[funcname] = &jobFunc{f: f, timeout: timeout}
-    defer worker.mutex.Unlock()
-    worker.functions[funcname] = f
 
+    if worker.running {
+        worker.addFunc(funcname, timeout)
+    }
+    return
+}
+
+// inner add function
+func (worker *Worker) addFunc(funcname string, timeout uint32) {
     var datatype uint32
     var data []byte
     if timeout == 0 {
@@ -124,42 +132,50 @@ func (worker *Worker) AddFunction(funcname string,
         data = append(data, t[:]...)
     }
     job := newJob(common.REQ, datatype, data)
-    worker.WriteJob(job)
+    worker.broadcast(job)
-    return
+
 }
 
 // Remove a function.
 // Tell job servers 'I can not do this now' at the same time.
-func (worker *Worker) RemoveFunction(funcname string) (err error) {
+func (worker *Worker) RemoveFunc(funcname string) (err error) {
-    worker.mutex.Lock()
+    if _, ok := worker.funcs[funcname]; !ok {
-    defer worker.mutex.Unlock()
+        return common.Errorf("The function does not exist: %s", funcname)
-
+    }
-    if worker.functions[funcname] == nil {
+    delete(worker.funcs, funcname)
-        return common.ErrFuncNotFound
+    if worker.running {
+        worker.removeFunc(funcname)
     }
-    delete(worker.functions, funcname)
-    job := newJob(common.REQ, common.CANT_DO, []byte(funcname))
-    worker.WriteJob(job)
     return
 }
 
+// inner remove function
+func (worker *Worker) removeFunc(funcname string) {
+    job := newJob(common.REQ, common.CANT_DO, []byte(funcname))
+    worker.broadcast(job)
+}
+
 // Main loop
 func (worker *Worker) Work() {
-    for _, v := range worker.clients {
+    defer func() {
+        worker.running = false
+    }()
+    for funcname, f := range worker.funcs {
+        worker.addFunc(funcname, f.timeout)
+    }
+    worker.running = true
+    for _, v := range worker.agents {
         go v.Work()
     }
-    for worker.running || len(worker.in) > 0{
+    ok := true
-        select {
+    for ok {
-        case job := <-worker.in:
+        if job, ok := <-worker.in; ok {
-            if job == nil {
-                break
-            }
             switch job.DataType {
-            case common.NO_JOB:
-                // do nothing
             case common.ERROR:
+                go func() {
                     _, err := common.GetError(job.Data)
                     worker.err(err)
+                }()
             case common.JOB_ASSIGN, common.JOB_ASSIGN_UNIQ:
                 go func() {
                     if err := worker.exec(job); err != nil {
@@ -167,54 +183,48 @@ func (worker *Worker) Work() {
                     }
                 }()
             default:
-                worker.JobQueue <- job
+                go worker.handleJob(job)
             }
         }
     }
-    close(worker.in)
+}
+
+// job handler
+func (worker *Worker) handleJob(job *Job) {
+    if worker.JobHandler != nil {
+        if err := worker.JobHandler(job); err != nil {
+            worker.err(err)
+        }
+    }
 }
 
 // Close.
-func (worker *Worker) Close() (err error) {
+func (worker *Worker) Close() {
-    for _, v := range worker.clients {
+    close(worker.in)
-        err = v.Close()
+    if worker.limit != nil {
-    }
+        close(worker.limit)
-    worker.running = false
-    return err
-}
-
-// Write a job to job server.
-// Here, the job's mean is not the oraginal mean.
-// Just looks like a network package for job's result or tell job server, there was a fail.
-func (worker *Worker) Broadcast(job *Job) {
-    for _, v := range worker.agents {
-        go func() {
-            if err := v.WriteJob(job); err != nil {
-                worker.err(err)
-            }
-        }()
     }
 }
 
 // Send a something out, get the samething back.
-func (worker *Worker) Echo(data []byte) (err error) {
+func (worker *Worker) Echo(data []byte) {
     job := newJob(common.REQ, common.ECHO_REQ, data)
-    return worker.WriteJob(job)
+    worker.broadcast(job)
 }
 
 // Remove all of functions.
 // Both from the worker or job servers.
-func (worker *Worker) Reset() (err error) {
+func (worker *Worker) Reset() {
     job := newJob(common.REQ, common.RESET_ABILITIES, nil)
-    err = worker.WriteJob(job)
+    worker.broadcast(job)
-    worker.functions = make(JobFunctionMap)
+    worker.funcs = make(JobFuncs)
-    return
 }
 
 // Set the worker's unique id.
-func (worker *Worker) SetId(id string) (err error) {
+func (worker *Worker) SetId(id string) {
+    worker.Id = id
     job := newJob(common.REQ, common.SET_CLIENT_ID, []byte(id))
-    return worker.WriteJob(job)
+    worker.broadcast(job)
 }
 
 // Execute the job. And send back the result.
@@ -240,11 +250,11 @@ func (worker *Worker) exec(job *Job) (err error) {
         job.UniqueId = string(jobdata[2])
         job.Data = jobdata[3]
     }
-    f, ok := worker.functions[funcname]
+    f, ok := worker.funcs[funcname]
     if !ok {
-        return common.ErrFuncNotFound
+        return common.Errorf("The function does not exist: %s", funcname)
     }
-    result, err := f(job)
+    result, err := f.f(job)
     var datatype uint32
     if err == nil {
         datatype = common.WORK_COMPLETE
@@ -259,7 +269,17 @@ func (worker *Worker) exec(job *Job) (err error) {
     job.magicCode = common.REQ
     job.DataType = datatype
     job.Data = result
-
+    job.agent.WriteJob(job)
-    worker.WriteJob(job)
     return
 }
+
+func (worker *Worker) removeAgent(a *agent) {
+    for k, v := range worker.agents {
+        if v == a {
+            worker.agents = append(worker.agents[:k], worker.agents[k + 1:] ...)
+        }
+    }
+    if len(worker.agents) == 0 {
+        worker.Close()
+    }
+}