Added some comments.

README

@@ -19,5 +19,4 @@ It was implemented a native protocol for both worker and client API.
 ----
 xingxing<mikespook@gmail.com>
 http://mikespook.com
-
-
+http://twitter.com/mikespook

src/pkg/gearman/client.go

@@ -1,3 +1,7 @@
+// 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.
+
 package gearman
 
 import (
@@ -8,6 +12,15 @@ import (
     "strconv"
 )
 
+/* 
+The client side api for gearman.
+
+usage:
+    client = NewClient()
+    client.AddServer("127.0.0.1:4730")
+    handle := client.Do("foobar", []byte("data here"), JOB_LOW | JOB_BG)
+
+*/
 type Client struct {
     mutex sync.Mutex
     conn net.Conn
@@ -16,6 +29,7 @@ type Client struct {
     UId uint32
 }
 
+// Create a new client.
 func NewClient() (client * Client){
     client = &Client{JobQueue:make(chan *ClientJob, QUEUE_CAP),
         incoming:make(chan []byte, QUEUE_CAP),
@@ -23,6 +37,9 @@ func NewClient() (client * Client){
     return
 }
 
+// Add a server.
+// In this version, one client connect to one job server.
+// Sample is better. Plz do the load balancing by your self.
 func (client *Client) AddServer(addr string) (err os.Error) {
     conn, err := net.Dial(TCP, addr)
     if err != nil {
@@ -32,10 +49,13 @@ func (client *Client) AddServer(addr string) (err os.Error) {
     return
 }
 
+// Internal read
 func (client *Client) read() (data []byte, err os.Error) {
     if len(client.incoming) > 0 {
+        // incoming queue is not empty
         data = <-client.incoming
     } else {
+        // empty queue, read data from socket
         for {
             buf := make([]byte, BUFFER_SIZE)
             var n int
@@ -51,6 +71,7 @@ func (client *Client) read() (data []byte, err os.Error) {
             }
         }
     }
+    // split package
     start, end := 0, 4
     for i := 0; i < len(data); i ++{
         if string(data[start:end]) == RES_STR {
@@ -72,6 +93,8 @@ func (client *Client) read() (data []byte, err os.Error) {
     return
 }
 
+// Read a job from job server.
+// This function will return the job, and add it to the job queue.
 func (client *Client) ReadJob() (job *ClientJob, err os.Error) {
     var rel []byte
     if rel, err = client.read(); err != nil {
@@ -91,6 +114,12 @@ func (client *Client) ReadJob() (job *ClientJob, err os.Error) {
     return
 }
 
+// Do the function.
+// funcname is a string with function name.
+// data is encoding to byte array.
+// flag set the job type, include running level: JOB_LOW, JOB_NORMAL, JOB_HIGH,
+// and if it is background job: JOB_BG.
+// JOB_LOW | JOB_BG means the job is running with low level in background.
 func (client *Client) Do(funcname string, data []byte, flag byte) (handle string, err os.Error) {
     var datatype uint32
     if flag & JOB_LOW == JOB_LOW {
@@ -147,6 +176,7 @@ func (client *Client) Do(funcname string, data []byte, flag byte) (handle string
     return
 }
 
+// Internal read last job
 func (client *Client) readLastJob(datatype uint32) (job *ClientJob, err os.Error){
     for {
         if job, err = client.ReadJob(); err != nil {
@@ -162,6 +192,8 @@ func (client *Client) readLastJob(datatype uint32) (job *ClientJob, err os.Error
     return
 }
 
+// Get job status from job server.
+// !!!Not fully tested.!!!
 func (client *Client) Status(handle string) (known, running bool, numerator, denominator uint, err os.Error) {
 
     if err = client.WriteJob(NewClientJob(REQ, GET_STATUS, []byte(handle))); err != nil {
@@ -191,6 +223,7 @@ func (client *Client) Status(handle string) (known, running bool, numerator, den
     return
 }
 
+// Send a something out, get the samething back.
 func (client *Client) Echo(data []byte) (echo []byte, err os.Error) {
     if err = client.WriteJob(NewClientJob(REQ, ECHO_REQ, data)); err != nil {
         return
@@ -203,7 +236,10 @@ func (client *Client) Echo(data []byte) (echo []byte, err os.Error) {
     return
 }
 
-func (client *Client) LastResult() (job *ClientJob) {
+// Get the last job.
+// the job means a network package. 
+// Normally, it is the job executed result.
+func (client *Client) LastJob() (job *ClientJob) {
     if l := len(client.JobQueue); l != 1 {
         if l == 0 {
             return
@@ -215,10 +251,12 @@ func (client *Client) LastResult() (job *ClientJob) {
     return <-client.JobQueue
 }
 
+// Send the job to job server.
 func (client *Client) WriteJob(job *ClientJob) (err os.Error) {
     return client.write(job.Encode())
 }
 
+// Internal write
 func (client *Client) write(buf []byte) (err os.Error) {
     var n int
     for i := 0; i < len(buf); i += n {
@@ -230,6 +268,7 @@ func (client *Client) write(buf []byte) (err os.Error) {
     return
 }
 
+// Close.
 func (client *Client) Close() (err os.Error) {
     err = client.conn.Close()
     close(client.JobQueue)

src/pkg/gearman/client/job.go

@@ -1,3 +1,7 @@
+// 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.
+
 package gearman
 
 import (
@@ -5,18 +9,21 @@ import (
 //    "log"
 )
 
+// Client side job
 type ClientJob struct {
     Data []byte
     Handle, UniqueId string
     magicCode, DataType uint32
 }
 
+// Create a new job
 func NewClientJob(magiccode, datatype uint32, data []byte) (job *ClientJob) {
     return &ClientJob{magicCode:magiccode,
         DataType:datatype,
         Data:data}
 }
 
+// Decode a job from byte slice
 func DecodeClientJob(data []byte) (job * ClientJob, err os.Error) {
     if len(data) < 12 {
         err = os.NewError("Data length is too small.")
@@ -33,6 +40,7 @@ func DecodeClientJob(data []byte) (job * ClientJob, err os.Error) {
     return
 }
 
+// Encode a job to byte slice
 func (job *ClientJob) Encode() (data []byte) {
     magiccode := uint32ToByte(job.magicCode)
     datatype := uint32ToByte(job.DataType)
@@ -46,6 +54,7 @@ func (job *ClientJob) Encode() (data []byte) {
     return
 }
 
+// Extract the job's result.
 func (job * ClientJob) Result() (data []byte, err os.Error){
     switch job.DataType {
         case WORK_FAIL:
@@ -69,6 +78,7 @@ func (job * ClientJob) Result() (data []byte, err os.Error){
     return
 }
 
+// Extract the job's update
 func (job *ClientJob) Update() (data []byte, err os.Error) {
     if job.DataType != WORK_DATA && job.DataType != WORK_WARNING {
         err = os.NewError("The job is not a update.")

src/pkg/gearman/gearman.go

@@ -1,3 +1,12 @@
+// 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.
+
+/*
+This module is Gearman API for golang. 
+The protocol was implemented by native way.
+*/
+
 package gearman
 
 import (
@@ -5,20 +14,27 @@ import (
 )
 
 const (
+    // tcp4 is tested. You can modify this to 'tcp' for both ipv4 and ipv6,
+    // or 'tcp6' only for ipv6.
     TCP = "tcp4"
+    // the number limited for job servers.
     WORKER_SERVER_CAP = 32
+    // the number limited for functions.
     WORKER_FUNCTION_CAP = 512
+    // queue size
     QUEUE_CAP = 512
+    // read buffer size
     BUFFER_SIZE = 1024
 
 
-     // \x00REQ
+    // \x00REQ
     REQ = 5391697
     REQ_STR = "\x00REQ"
     // \x00RES
     RES = 5391699
     RES_STR = "\x00RES"
 
+    // package data type
     CAN_DO = 1
     CANT_DO = 2
     RESET_ABILITIES = 3
@@ -51,16 +67,24 @@ const (
     SUBMIT_JOB_LOW = 33
     SUBMIT_JOB_LOW_BG = 34
 
+    // Job type
+    // JOB_NORMAL | JOB_BG means a normal level job run in background
+    // normal level
     JOB_NORMAL = 0
+    // background job
     JOB_BG = 1
+    // low level
     JOB_LOW = 2
+    // high level
     JOB_HIGH = 4
 )
 
+// No use
 type Job interface {
     Encode() []byte
 }
 
+// Splite the byte array by a byte
 func splitByteArray(slice []byte, spot byte) (data [][]byte){
     data = make([][]byte, 0, 10)
     start, end := 0, 0
@@ -78,6 +102,7 @@ func splitByteArray(slice []byte, spot byte) (data [][]byte){
     return
 }
 
+// Extract the error message
 func getError(data []byte) (eno os.Errno, err os.Error) {
     rel := splitByteArray(data, '\x00')
     if len(rel) != 2 {
@@ -90,6 +115,7 @@ func getError(data []byte) (eno os.Errno, err os.Error) {
     return
 }
 
+// Decode [4]byte to uint32 
 func byteToUint32(buf [4]byte) uint32 {
     return uint32(buf[0]) << 24 +
         uint32(buf[1]) << 16 +
@@ -97,6 +123,7 @@ func byteToUint32(buf [4]byte) uint32 {
         uint32(buf[3])
 }
 
+// Encode uint32 to [4]byte
 func uint32ToByte(i uint32) (data [4]byte) {
     data[0] = byte((i >> 24) & 0xff)
     data[1] = byte((i >> 16) & 0xff)

src/pkg/gearman/worker.go

@@ -1,3 +1,7 @@
+// 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.
+
 package gearman
 
 import(
@@ -6,9 +10,29 @@ import(
 //    "log"
 )
 
+// The definition of the callback function.
 type JobFunction func(job *WorkerJob) ([]byte, os.Error)
+// Map for added function.
 type JobFunctionMap map[string]JobFunction
 
+/*
+Worker side api for gearman.
+
+usage:
+    worker = NewWorker()
+    worker.AddFunction("foobar", foobar)
+    worker.AddServer("127.0.0.1:4730")
+    worker.Work() // Enter the worker's main loop
+
+The definition of the callback function 'foobar' should suit for the type 'JobFunction'.
+It looks like this:
+
+func foobar(job *WorkerJob) (data []byte, err os.Error) {
+    //sth. here
+    //plaplapla...
+    return
+}
+*/ 
 type Worker struct {
     clients []*jobClient
     functions JobFunctionMap
@@ -20,6 +44,7 @@ type Worker struct {
     ErrQueue chan os.Error
 }
 
+// Get a new worker
 func NewWorker() (worker *Worker) {
     worker = &Worker{
         // job server list
@@ -34,8 +59,8 @@ func NewWorker() (worker *Worker) {
     return
 }
 
-// add server
-// worker.AddServer("127.0.0.1:4730")
+// Add a server. The addr should be 'host:port' format.
+// The connection is established at this time.
 func (worker * Worker) AddServer(addr string) (err os.Error) {
     worker.mutex.Lock()
     defer worker.mutex.Unlock()
@@ -57,12 +82,11 @@ func (worker * Worker) AddServer(addr string) (err os.Error) {
 }
 
 
-// add function
+// 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,
     f JobFunction, timeout uint32) (err os.Error) {
-    if f == nil {
-        return os.NewError("Job function should not be nil.")
-    }
     if len(worker.clients) < 1 {
         return os.NewError("Did not connect to Job Server.")
     }
@@ -86,7 +110,8 @@ func (worker * Worker) AddFunction(funcname string,
     return
 }
 
-// remove function
+// Remove a function.
+// Tell job servers 'I can not do this now' at the same time.
 func (worker * Worker) RemoveFunction(funcname string) (err os.Error) {
     worker.mutex.Lock()
     defer worker.mutex.Unlock()
@@ -100,7 +125,7 @@ func (worker * Worker) RemoveFunction(funcname string) (err os.Error) {
     return
 }
 
-// work
+// Main loop
 func (worker * Worker) Work() {
     for _, v := range worker.clients {
         go v.Work()
@@ -118,10 +143,11 @@ func (worker * Worker) Work() {
                         _, err := getError(job.Data)
                         worker.ErrQueue <- err
                     case JOB_ASSIGN, JOB_ASSIGN_UNIQ:
-                        if err := worker.exec(job); err != nil {
-                            worker.ErrQueue <- err
-                            continue
-                        }
+                        go func() {
+                            if err := worker.exec(job); err != nil {
+                                worker.ErrQueue <- err
+                            }
+                        }()
                     default:
                         worker.JobQueue <- job
                 }
@@ -129,7 +155,11 @@ func (worker * Worker) Work() {
     }
 }
 
-func (worker * Worker) LastResult() (job *WorkerJob) {
+// Get the last job in queue.
+// If there are more than one job in the queue, 
+// the last one will be returned,
+// the others will be lost.
+func (worker * Worker) LastJob() (job *WorkerJob) {
     if l := len(worker.JobQueue); l != 1 {
         if l == 0 {
             return
@@ -141,8 +171,7 @@ func (worker * Worker) LastResult() (job *WorkerJob) {
     return <-worker.JobQueue
 }
 
-// Close
-// should used as defer
+// Close.
 func (worker * Worker) Close() (err os.Error){
     worker.running = false
     for _, v := range worker.clients {
@@ -152,6 +181,9 @@ func (worker * Worker) Close() (err os.Error){
     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) WriteJob(job *WorkerJob) (err os.Error) {
     e := make(chan os.Error)
     for _, v := range worker.clients {
@@ -162,13 +194,14 @@ func (worker * Worker) WriteJob(job *WorkerJob) (err os.Error) {
     return <- e
 }
 
-// Echo
+// Send a something out, get the samething back.
 func (worker * Worker) Echo(data []byte) (err os.Error) {
     job := NewWorkerJob(REQ, ECHO_REQ, data)
     return worker.WriteJob(job)
 }
 
-// Reset
+// Remove all of functions.
+// Both from the worker or job servers.
 func (worker * Worker) Reset() (err os.Error){
     job := NewWorkerJob(REQ, RESET_ABILITIES, nil)
     err = worker.WriteJob(job)
@@ -176,13 +209,13 @@ func (worker * Worker) Reset() (err os.Error){
     return
 }
 
-// SetId
+// Set the worker's unique id.
 func (worker * Worker) SetId(id string) (err os.Error) {
     job := NewWorkerJob(REQ, SET_CLIENT_ID, []byte(id))
     return worker.WriteJob(job)
 }
 
-// Exec
+// Execute the job. And send back the result.
 func (worker * Worker) exec(job *WorkerJob) (err os.Error) {
     jobdata := splitByteArray(job.Data, '\x00')
     job.Handle = string(jobdata[0])

src/pkg/gearman/worker/job.go

@@ -1,10 +1,16 @@
+// 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.
+
 package gearman
 
 import (
     "os"
+    "strconv"
 //    "log"
 )
 
+// Worker side job
 type WorkerJob struct {
     Data []byte
     Handle, UniqueId string
@@ -13,12 +19,14 @@ type WorkerJob struct {
     Job
 }
 
+// Create a new job
 func NewWorkerJob(magiccode, datatype uint32, data []byte) (job *WorkerJob) {
     return &WorkerJob{magicCode:magiccode,
         DataType: datatype,
         Data:data}
 }
 
+// Decode job from byte slice
 func DecodeWorkerJob(data []byte) (job *WorkerJob, err os.Error) {
     if len(data) < 12 {
         err = os.NewError("Data length is too small.")
@@ -35,6 +43,7 @@ func DecodeWorkerJob(data []byte) (job *WorkerJob, err os.Error) {
     return
 }
 
+// Encode a job to byte slice
 func (job *WorkerJob) Encode() (data []byte) {
     magiccode := uint32ToByte(job.magicCode)
     datatype := uint32ToByte(job.DataType)
@@ -54,7 +63,8 @@ func (job *WorkerJob) Encode() (data []byte) {
     return
 }
 
-// update data
+// Send some datas to client.
+// Using this in a job's executing.
 func (job * WorkerJob) UpdateData(data []byte, iswaring bool) (err os.Error) {
     result := append([]byte(job.Handle), 0)
     result = append(result, data ...)
@@ -67,13 +77,14 @@ func (job * WorkerJob) UpdateData(data []byte, iswaring bool) (err os.Error) {
     return job.client.WriteJob(NewWorkerJob(REQ, datatype, result))
 }
 
-// update status
-func (job * WorkerJob) UpdateStatus(numerator, denominator uint32) (err os.Error) {
-    n := uint32ToByte(numerator)
-    d := uint32ToByte(denominator)
+// Update status.
+// Tall client how many percent job has been executed.
+func (job * WorkerJob) UpdateStatus(numerator, denominator int) (err os.Error) {
+    n := []byte(strconv.Itoa(numerator))
+    d := []byte(strconv.Itoa(denominator))
     result := append([]byte(job.Handle), 0)
-    result = append(result, n[:] ...)
-    result = append(result, d[:] ...)
+    result = append(result, n ...)
+    result = append(result, d ...)
     return job.client.WriteJob(NewWorkerJob(REQ, WORK_STATUS, result))
 }
 

src/pkg/gearman/worker/jobclient.go

@@ -1,3 +1,7 @@
+// 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.
+
 package gearman
 
 import (
@@ -6,12 +10,14 @@ import (
 //    "log"
 )
 
+// The client of job server.
 type jobClient struct {
     conn net.Conn
     worker *Worker
     running bool
 }
 
+// Create the client of job server.
 func newJobClient(addr string, worker *Worker) (jobclient *jobClient, err os.Error) {
     conn, err := net.Dial(TCP, addr)
     if err != nil {
@@ -21,6 +27,7 @@ func newJobClient(addr string, worker *Worker) (jobclient *jobClient, err os.Err
     return jobclient, err
 }
 
+// Main loop.
 func (client *jobClient) Work() {
     noop := true
     OUT: for client.running {
@@ -64,10 +71,12 @@ func (client *jobClient) Work() {
     return
 }
 
+// Send a job to the job server.
 func (client *jobClient) WriteJob(job *WorkerJob) (err os.Error) {
     return client.Write(job.Encode())
 }
 
+// Write the encoded job.
 func (client *jobClient) Write(buf []byte) (err os.Error) {
     var n int
     for i := 0; i < len(buf); i += n {
@@ -79,6 +88,7 @@ func (client *jobClient) Write(buf []byte) (err os.Error) {
     return
 }
 
+// Close.
 func (client *jobClient) Close() (err os.Error) {
     client.running = false
     err = client.conn.Close()