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agent.go
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agent.go
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package main
import (
"encoding/binary"
"fmt"
"github.com/golang/protobuf/proto"
"github.com/yangmls/vcron"
"net"
"os"
)
type Agent struct {
Name string
Addr string
Port string
C net.Conn
}
func (agent *Agent) Run() {
err := agent.Connect()
if err != nil {
fmt.Println("can not connect to", agent.Addr, "on port", agent.Port)
return
}
agent.Waiting()
}
func (agent *Agent) Connect() error {
conn, err := net.Dial("tcp", agent.Addr+":"+agent.Port)
agent.C = conn
return err
}
func (agent *Agent) Waiting() {
for {
request, err := agent.WaitRequest()
if err != nil {
break
}
response := &vcron.Response{
Result: true,
}
if request.Type == "register" {
response.Message = agent.Name
}
if request.Type == "run" {
for _, job := range request.Jobs {
go RunCommand(job.Command)
}
}
agent.SendResponse(response)
}
}
func (agent *Agent) WaitRequest() (*vcron.Request, error) {
var (
n int
err error
)
fmt.Println("waiting request")
prefix := make([]byte, 4, 4)
if n, err = agent.C.Read(prefix); err != nil {
return nil, err
}
fmt.Println(prefix)
if n == 0 {
return nil, nil
}
if n != 4 {
return nil, nil
}
var (
size uint64
errcode int
)
if size, errcode = binary.Uvarint(prefix); errcode <= 0 {
return nil, nil
}
buf := make([]byte, int(size), int(size))
if n, err = agent.C.Read(buf); err != nil {
return nil, err
}
if uint64(n) != size {
return nil, nil
}
fmt.Println("got request")
if err != nil {
return nil, err
}
request := &vcron.Request{}
err = proto.Unmarshal(buf, request)
if err != nil {
return nil, err
}
return request, nil
}
func (agent *Agent) SendResponse(response *vcron.Response) {
data, _ := proto.Marshal(response)
agent.C.Write(data)
}
func NewAgent(name string, addr string, port string) *Agent {
if name == "" {
name = defaultName()
}
agent := &Agent{
Name: name,
Addr: addr,
Port: port,
}
return agent
}
func defaultName() (name string) {
name, err := os.Hostname()
if err != nil {
return ""
}
return name
}