283 lines
7.6 KiB
Go
283 lines
7.6 KiB
Go
// Copyright 2011 Xing Xing <mikespook@gmail.com>.
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// All rights reserved.
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// Use of this source code is governed by a MIT
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// license that can be found in the LICENSE file.
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package client
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import (
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"io"
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"net"
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"time"
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"bytes"
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"strconv"
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"github.com/mikespook/golib/autoinc"
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"github.com/mikespook/gearman-go/common"
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)
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// Job handler
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type JobHandler func(*Job) error
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// Status handler
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// handle, known, running, numerator, denominator
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type StatusHandler func(string, bool, bool, uint64, uint64)
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/*
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The client side api for gearman
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usage:
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c := client.New("tcp4", "127.0.0.1:4730")
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handle := c.Do("foobar", []byte("data here"), JOB_LOW | JOB_BG)
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*/
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type Client struct {
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ErrHandler common.ErrorHandler
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JobHandler JobHandler
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StatusHandler StatusHandler
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TimeOut time.Duration
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in chan []byte
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out chan *Job
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jobCreated chan *Job
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conn net.Conn
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ai *autoinc.AutoInc
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}
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// Create a new client.
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// Connect to "addr" through "network"
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// Eg.
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// client, err := client.New("127.0.0.1:4730")
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func New(addr string) (client *Client, err error) {
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conn, err := net.Dial(common.NETWORK, addr)
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if err != nil {
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return
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}
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client = &Client{
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jobCreated: make(chan *Job),
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in: make(chan []byte, common.QUEUE_SIZE),
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out: make(chan *Job, common.QUEUE_SIZE),
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conn: conn,
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ai: autoinc.New(0, 1),
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TimeOut: time.Second,
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}
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go client.inLoop()
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go client.outLoop()
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return
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}
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// out loop
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func (client *Client) outLoop() {
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ok := true
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for ok {
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if job, ok := <-client.out; ok {
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if err := client.write(job.Encode()); err != nil {
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client.err(err)
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}
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}
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}
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}
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// in loop
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func (client *Client) inLoop() {
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defer common.DisablePanic()
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for {
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rel, err := client.read()
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if err != nil {
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if err == common.ErrConnection {
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client.Close()
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break
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}
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client.err(err)
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continue
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}
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job, err := decodeJob(rel)
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if err != nil {
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client.err(err)
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continue
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}
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switch job.DataType {
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case common.ERROR:
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_, err := common.GetError(job.Data)
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client.err(err)
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case common.WORK_DATA, common.WORK_WARNING, common.WORK_STATUS,
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common.WORK_COMPLETE, common.WORK_FAIL, common.WORK_EXCEPTION,
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common.ECHO_RES:
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go client.handleJob(job)
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case common.JOB_CREATED:
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client.jobCreated <- job
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case common.STATUS_RES:
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go client.handleStatus(job)
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}
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}
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}
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// inner read
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func (client *Client) read() (data []byte, err error) {
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if len(client.in) > 0 {
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// incoming queue is not empty
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data = <-client.in
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} else {
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// empty queue, read data from socket
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for {
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buf := make([]byte, common.BUFFER_SIZE)
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var n int
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if n, err = client.conn.Read(buf); err != nil {
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if err == io.EOF && n == 0 {
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if data == nil {
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err = common.ErrConnection
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return
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}
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break
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}
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return
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}
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data = append(data, buf[0:n]...)
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if n < common.BUFFER_SIZE {
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break
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}
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}
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}
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// split package
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tl := len(data)
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start, end := 0, 4
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for i := 0; i < tl; i++ {
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if string(data[start:end]) == common.RES_STR {
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l := int(common.BytesToUint32([4]byte{data[start+8], data[start+9], data[start+10], data[start+11]}))
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total := l + 12
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if total == tl {
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return
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} else {
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client.in <- data[total:]
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data = data[:total]
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return
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}
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} else {
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start++
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end++
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}
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}
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return nil, common.Errorf("Invalid data: %V", data)
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}
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// error handler
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func (client *Client) err (e error) {
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if client.ErrHandler != nil {
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client.ErrHandler(e)
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}
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}
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// job handler
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func (client *Client) handleJob(job *Job) {
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if client.JobHandler != nil {
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if err := client.JobHandler(job); err != nil {
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client.err(err)
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}
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}
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}
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// status handler
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func (client *Client) handleStatus(job *Job) {
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if client.StatusHandler != nil {
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data := bytes.SplitN(job.Data, []byte{'\x00'}, 5)
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if len(data) != 5 {
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client.err(common.Errorf("Invalid data: %V", job.Data))
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return
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}
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handle := string(data[0])
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known := (data[1][0] == '1')
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running := (data[2][0] == '1')
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numerator, err := strconv.ParseUint(string(data[3][0]), 10, 0)
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if err != nil {
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client.err(common.Errorf("Invalid handle: %s", data[3][0]))
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return
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}
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denominator, err := strconv.ParseUint(string(data[4][0]), 10, 0)
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if err != nil {
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client.err(common.Errorf("Invalid handle: %s", data[4][0]))
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return
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}
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client.StatusHandler(handle, known, running, numerator, denominator)
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}
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}
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// Do the function.
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// funcname is a string with function name.
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// data is encoding to byte array.
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// flag set the job type, include running level: JOB_LOW, JOB_NORMAL, JOB_HIGH,
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// and if it is background job: JOB_BG.
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// JOB_LOW | JOB_BG means the job is running with low level in background.
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func (client *Client) Do(funcname string, data []byte, flag byte) (handle string, err error) {
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var datatype uint32
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if flag & JOB_LOW == JOB_LOW {
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if flag & JOB_BG == JOB_BG {
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datatype = common.SUBMIT_JOB_LOW_BG
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} else {
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datatype = common.SUBMIT_JOB_LOW
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}
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} else if flag & JOB_HIGH == JOB_HIGH {
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if flag & JOB_BG == JOB_BG {
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datatype = common.SUBMIT_JOB_HIGH_BG
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} else {
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datatype = common.SUBMIT_JOB_HIGH
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}
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} else if flag & JOB_BG == JOB_BG {
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datatype = common.SUBMIT_JOB_BG
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} else {
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datatype = common.SUBMIT_JOB
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}
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uid := strconv.Itoa(int(client.ai.Id()))
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l := len(funcname) + len(uid) + len(data) + 2
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rel := make([]byte, 0, l)
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rel = append(rel, []byte(funcname)...) // len(funcname)
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rel = append(rel, '\x00') // 1 Byte
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rel = append(rel, []byte(uid)...) // len(uid)
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rel = append(rel, '\x00') // 1 Byte
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rel = append(rel, data...) // len(data)
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client.writeJob(newJob(common.REQ, datatype, rel))
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// Waiting for JOB_CREATED
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select {
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case job := <-client.jobCreated:
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return string(job.Data), nil
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case <-time.After(client.TimeOut):
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return "", common.ErrJobTimeOut
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}
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return
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}
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// Get job status from job server.
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// !!!Not fully tested.!!!
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func (client *Client) Status(handle string) {
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job := newJob(common.REQ, common.GET_STATUS, []byte(handle))
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client.writeJob(job)
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}
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// Send a something out, get the samething back.
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func (client *Client) Echo(data []byte) {
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client.writeJob(newJob(common.REQ, common.ECHO_REQ, data))
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}
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// Send the job to job server.
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func (client *Client) writeJob(job *Job) {
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client.out <- job
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}
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// Internal write
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func (client *Client) write(buf []byte) (err error) {
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var n int
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for i := 0; i < len(buf); i += n {
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n, err = client.conn.Write(buf[i:])
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if err != nil {
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return
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}
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}
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return
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}
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// Close
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func (client *Client) Close() (err error) {
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close(client.jobCreated)
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close(client.in)
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close(client.out)
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return client.conn.Close();
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}
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