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Added some comments.

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This commit is contained in:
mikespook 2011-05-23 12:15:48 +08:00
parent 2d62a1d5d1
commit 7eb966bc36
7 changed files with 159 additions and 30 deletions
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3
README
View File

@ -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

41
src/pkg/gearman/client.go
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@ -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)

10
src/pkg/gearman/client/job.go
View File

@ -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.")

27
src/pkg/gearman/gearman.go
View File

@ -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 (
@ -5,10 +14,16 @@ 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
@ -19,6 +34,7 @@ const (
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)

65
src/pkg/gearman/worker.go
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@ -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:
go func() {
if err := worker.exec(job); err != nil {
worker.ErrQueue <- err
continue
}
}()
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])

25
src/pkg/gearman/worker/job.go
View File

@ -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))
}

10
src/pkg/gearman/worker/jobclient.go
View File

@ -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()