gearman-go/worker/job.go
2013-04-24 16:58:06 +08:00

135 lines
3.6 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 (
"bytes"
"strconv"
"github.com/mikespook/gearman-go/common"
)
// Worker side job
type Job struct {
Data []byte
Handle, UniqueId, Fn string
agent *agent
magicCode, DataType uint32
c chan bool
}
// Create a new job
func newJob(magiccode, datatype uint32, data []byte) (job *Job) {
return &Job{magicCode: magiccode,
DataType: datatype,
Data: data,
c: make(chan bool),}
}
// Decode job from byte slice
func decodeJob(data []byte) (job *Job, err error) {
if len(data) < 12 {
return nil, common.Errorf("Invalid data: %V", data)
}
datatype := common.BytesToUint32([4]byte{data[4], data[5], data[6], data[7]})
l := common.BytesToUint32([4]byte{data[8], data[9], data[10], data[11]})
if len(data[12:]) != int(l) {
return nil, common.Errorf("Invalid data: %V", data)
}
data = data[12:]
job = &Job{magicCode: common.RES, DataType: datatype, c: make(chan bool),}
switch datatype {
case common.JOB_ASSIGN:
s := bytes.SplitN(data, []byte{'\x00'}, 3)
if len(s) == 3 {
job.Handle = string(s[0])
job.Fn = string(s[1])
data = s[2]
}
case common.JOB_ASSIGN_UNIQ:
s := bytes.SplitN(data, []byte{'\x00'}, 4)
if len(s) == 4 {
job.Handle = string(s[0])
job.Fn = string(s[1])
job.UniqueId = string(s[2])
data = s[3]
}
}
job.Data = data
return
}
// Encode a job to byte slice
func (job *Job) Encode() (data []byte) {
var l int
if job.DataType == common.WORK_FAIL {
l = len(job.Handle)
} else {
l = len(job.Data)
if job.Handle != "" {
l += len(job.Handle) + 1
}
}
data = make([]byte, 0, l + 12)
magiccode := common.Uint32ToBytes(job.magicCode)
datatype := common.Uint32ToBytes(job.DataType)
datalength := common.Uint32ToBytes(uint32(l))
data = append(data, magiccode[:]...)
data = append(data, datatype[:]...)
data = append(data, datalength[:]...)
if job.Handle != "" {
data = append(data, []byte(job.Handle)...)
if job.DataType != common.WORK_FAIL {
data = append(data, 0)
}
}
data = append(data, job.Data...)
return
}
// Send some datas to client.
// Using this in a job's executing.
func (job *Job) UpdateData(data []byte, iswarning bool) {
result := append([]byte(job.Handle), 0)
result = append(result, data...)
var datatype uint32
if iswarning {
datatype = common.WORK_WARNING
} else {
datatype = common.WORK_DATA
}
job.agent.WriteJob(newJob(common.REQ, datatype, result))
}
// Update status.
// Tall client how many percent job has been executed.
func (job *Job) UpdateStatus(numerator, denominator int) {
n := []byte(strconv.Itoa(numerator))
d := []byte(strconv.Itoa(denominator))
result := append([]byte(job.Handle), '\x00')
result = append(result, n...)
result = append(result, '\x00')
result = append(result, d...)
job.agent.WriteJob(newJob(common.REQ, common.WORK_STATUS, result))
}
// close the job
func (job *Job) Close() {
close(job.c)
}
// cancel the job executing
func (job *Job) cancel() {
defer func() {recover()}()
job.c <- true
}
// When a job was canceled, return a true form a channel
func (job *Job) Canceled() <-chan bool {
return job.c
}