130 lines
2.3 KiB
Go
130 lines
2.3 KiB
Go
// Copyright 2011 Xing Xing <mikespook@gmail.com> 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 worker
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import (
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"io"
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"net"
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)
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// The agent of job server.
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type agent struct {
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conn net.Conn
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worker *Worker
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in chan []byte
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net, addr string
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isConn bool
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}
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// Create the agent of job server.
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func newAgent(net, addr string, worker *Worker) (a *agent, err error) {
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a = &agent{
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net: net,
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addr: addr,
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worker: worker,
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in: make(chan []byte, QUEUE_SIZE),
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}
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return
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}
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func (a *agent) Connect() (err error) {
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a.conn, err = net.Dial(a.net, a.addr)
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if err != nil {
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return
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}
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a.isConn = true
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return
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}
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func (a *agent) Work() {
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var inpack *inPack
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var l int
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var err error
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var data, leftdata []byte
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for a.isConn {
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if data, err = a.read(BUFFER_SIZE); err != nil {
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if err == ErrConnClosed {
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break
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}
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a.worker.err(err)
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continue
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}
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if len(leftdata) > 0 { // some data left for processing
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data = append(leftdata, data...)
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}
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if len(data) < MIN_PACKET_LEN { // not enough data
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leftdata = data
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continue
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}
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if inpack, l, err = decodeInPack(data); err != nil {
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a.worker.err(err)
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continue
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}
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leftdata = nil
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inpack.a = a
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a.worker.in <- inpack
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if len(data) > l {
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leftdata = data[l:]
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}
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}
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}
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func (a *agent) Close() {
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if a.conn != nil {
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a.conn.Close()
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}
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}
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func (a *agent) Grab() {
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outpack := getOutPack()
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outpack.dataType = GRAB_JOB_UNIQ
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a.write(outpack)
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}
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func (a *agent) PreSleep() {
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outpack := getOutPack()
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outpack.dataType = PRE_SLEEP
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a.write(outpack)
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}
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// read length bytes from the socket
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func (a *agent) read(length int) (data []byte, err error) {
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n := 0
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buf := getBuffer(BUFFER_SIZE)
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// read until data can be unpacked
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for i := length; i > 0 || len(data) < MIN_PACKET_LEN; i -= n {
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if n, err = a.conn.Read(buf); err != nil {
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if !a.isConn {
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err = ErrConnClosed
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return
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}
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if err == io.EOF && n == 0 {
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if data == nil {
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err = ErrConnection
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}
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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 < BUFFER_SIZE {
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break
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}
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}
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return
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}
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// Internal write the encoded job.
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func (a *agent) write(outpack *outPack) (err error) {
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var n int
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buf := outpack.Encode()
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for i := 0; i < len(buf); i += n {
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n, err = a.conn.Write(buf[i:])
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if err != nil {
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return err
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}
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}
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return
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}
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