gearman-go/worker/agent.go
2013-12-23 17:01:01 +08:00

130 lines
2.3 KiB
Go

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