overflow_probes/service/ContainerService.go

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package service
import (
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"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
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"reflect"
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"strconv"
"time"
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cda "git.loafle.net/commons_go/di/annotation"
cdr "git.loafle.net/commons_go/di/registry"
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"git.loafle.net/commons_go/logging"
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crc "git.loafle.net/commons_go/rpc/client"
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oopcc "git.loafle.net/overflow/overflow_probe_container/client"
"git.loafle.net/overflow/overflow_probes/config"
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)
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func init() {
cdr.RegisterType(reflect.TypeOf((*ContainerService)(nil)), &cda.ComponentAnnotation{})
}
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type ContainerService struct {
clients map[string]*containerState
}
type containerState struct {
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pid int
port int
client crc.Client
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}
func (cs *ContainerService) Call(name string, result interface{}, method string, params ...interface{}) error {
c, err := cs.GetClient(name)
if nil != err {
return err
}
return c.Call(result, method, params...)
}
func (cs *ContainerService) Send(name string, method string, params ...interface{}) error {
c, err := cs.GetClient(name)
if nil != err {
return err
}
return c.Send(method, params...)
}
func (cs *ContainerService) GetClient(name string) (crc.Client, error) {
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cState, ok := cs.clients[name]
if !ok {
if err := cs.runProcess(name); nil != err {
return nil, err
}
cState, _ = cs.clients[name]
}
return cState.client, nil
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}
func (cs *ContainerService) Connect(name string) error {
return nil
}
func (cs *ContainerService) runProcess(name string) error {
ok := cs.checkProcess(name)
if ok {
return nil
}
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cmdPath := path.Join(config.Config.Paths["root"], config.Config.Paths["bin"], name+".sh")
pidPath := path.Join(config.Config.Paths["root"], config.Config.Paths["pid"], name+".pid")
cmd := exec.Command(cmdPath, pidPath)
if err := cmd.Start(); nil != err {
logging.Logger().Error(fmt.Sprintf("Probe: To run container(%s) failed err %v", name, err))
return err
}
port, err := watchPidFileCreate(pidPath, time.Duration(time.Second*2))
if nil != err {
return err
}
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clientAddr := fmt.Sprintf("localhost:%d", port)
client := oopcc.New(clientAddr, nil)
if err := client.Connect(); nil != err {
cmd.Process.Kill()
return err
}
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cState := &containerState{
pid: cmd.Process.Pid,
port: port,
client: client,
}
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cs.clients[name] = cState
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return nil
}
func (cs *ContainerService) checkProcess(name string) bool {
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cState, ok := cs.clients[name]
if !ok || nil == cState || nil == cState.client {
return false
}
_, err := os.FindProcess(cState.pid)
if nil != err {
return false
}
return true
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}
func (cs *ContainerService) killProcess(name string) error {
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cState, ok := cs.clients[name]
if !ok || nil == cState || nil == cState.client {
return fmt.Errorf("Probe: Container[%s] is not exist", name)
}
p, err := os.FindProcess(cState.pid)
if nil != err {
return err
}
if err = p.Kill(); nil != err {
return err
}
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return nil
}
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func watchPidFileCreate(pidFilePath string, waitTime time.Duration) (int, error) {
startTime := time.Now()
for {
if _, err := os.Stat(pidFilePath); err == nil {
buf, err := ioutil.ReadFile(pidFilePath)
if nil != err {
return 0, err
}
portNumber, err := strconv.ParseInt(string(buf), 10, 32)
if nil != err {
return 0, err
}
return int(portNumber), nil
}
if time.Since(startTime) > waitTime {
return 0, fmt.Errorf("Probe: pid file not exist")
}
time.Sleep(time.Duration(time.Millisecond * 100))
}
}