gearman-go/worker/agent.go
mikespook 2960cb9953 refacotring worker's code
--HG--
branch : 0.1
rename : worker/jobagent.go => worker/agent.go
rename : worker/workerjob.go => worker/job.go
2012-05-23 17:45:52 +08:00

138 lines
3.4 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"
"bitbucket.org/mikespook/gearman-go/common"
)
// The agent of job server.
type jobAgent struct {
conn net.Conn
worker *Worker
running bool
in chan []byte
out chan *Job
}
// Create the agent of job server.
func newJobAgent(addr string, worker *Worker) (jobagent *jobAgent, err error) {
conn, err := net.Dial(common.NETWORK, addr)
if err != nil {
return nil, err
}
jobagent = &jobAgent{
conn: conn,
worker: worker,
running: true,
in: make(chan []byte, common.QUEUE_SIZE),
}
return jobagent, err
}
// Internal read
func (agent *jobAgent) read() (data []byte, err error) {
if len(agent.in) > 0 {
// in queue is not empty
data = <-agent.in
} else {
for {
buf := make([]byte, common.BUFFER_SIZE)
var n int
if n, err = agent.conn.Read(buf); err != nil {
if err == io.EOF && n == 0 {
err = nil
return
}
return
}
data = append(data, buf[0:n]...)
if n < common.BUFFER_SIZE {
break
}
}
}
// split package
start := 0
tl := len(data)
for i := 0; i < tl; i++ {
if string(data[start:start+4]) == common.RES_STR {
l := int(common.BytesToUint32([4]byte{data[start+8], data[start+9], data[start+10], data[start+11]}))
total := l + 12
if total == tl {
return
} else {
agent.in <- data[total:]
data = data[:total]
return
}
} else {
start++
}
}
err = common.ErrInvalidData
return
}
// Main loop.
func (agent *jobAgent) Work() {
noop := true
for agent.running {
// got noop msg and in queue is zero, grab job
if noop && len(agent.in) == 0 {
agent.WriteJob(newJob(common.REQ, common.GRAB_JOB, nil))
}
rel, err := agent.read()
if err != nil {
agent.worker.err(err)
continue
}
job, err := decodeJob(rel)
if err != nil {
agent.worker.err(err)
continue
} else {
switch job.DataType {
case common.NOOP:
noop = true
case common.NO_JOB:
noop = false
agent.WriteJob(newJob(common.REQ, common.PRE_SLEEP, nil))
case common.ECHO_RES, common.JOB_ASSIGN_UNIQ, common.JOB_ASSIGN:
job.agent = agent
agent.worker.in <- job
}
}
}
return
}
// Send a job to the job server.
func (agent *jobAgent) WriteJob(job *Job) (err error) {
return agent.write(job.Encode())
}
// Internal write the encoded job.
func (agent *jobAgent) write(buf []byte) (err error) {
var n int
for i := 0; i < len(buf); i += n {
n, err = agent.conn.Write(buf[i:])
if err != nil {
return err
}
}
return
}
// Close.
func (agent *jobAgent) Close() (err error) {
agent.running = false
close(agent.in)
err = agent.conn.Close()
return
}