/
agent.go
239 lines (207 loc) · 4.5 KB
/
agent.go
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package boot
import (
"context"
"github.com/2345tech/apollo-agent/common"
"log"
"net/http"
_ "net/http/pprof"
"os"
"sync"
"time"
)
const (
VERSION = "v4.2.1"
AUTHOR = "lixy<lixy@2345.com>; cinvanlee<cinvan.lee@gmail.com>"
FilePerm = 0644
)
type AgentLauncher interface {
Init(agent *Agent) error
Run() error
Stop()
Shutdown()
}
type LauncherFunc func(*Agent) error
func WithLauncher(launcher AgentLauncher) LauncherFunc {
return func(agent *Agent) error {
agent.Launchers = append(agent.Launchers, launcher)
return launcher.Init(agent)
}
}
type SignalBus struct {
StopS chan struct{}
RestartS chan struct{}
}
type Agent struct {
isRunning bool
Args *Args
EnvProfile bool
LogFile *os.File
LogExpire time.Duration
BeatFreQ time.Duration
LogL *LogLauncher
ConfigL *ProfileLauncher
SignalL *SignalLauncher
LFunc []LauncherFunc
Launchers []AgentLauncher
Context context.Context
Cancel context.CancelFunc
Wg *sync.WaitGroup
Handlers []common.AgentHandler
SigBus *SignalBus
}
func New(lfs ...LauncherFunc) *Agent {
if len(lfs) <= 0 {
panic("[ERROR] not found LauncherFunc")
}
args := NewArg()
agent := &Agent{
Args: args,
LFunc: lfs,
Launchers: make([]AgentLauncher, 0),
Handlers: make([]common.AgentHandler, 0),
SigBus: &SignalBus{
StopS: make(chan struct{}),
RestartS: make(chan struct{}),
},
}
args.Init(agent)
if *args.Pprof {
go func() {
_ = http.ListenAndServe("127.0.0.1:18081", nil)
}()
}
return agent
}
func (a *Agent) Init() *Agent {
for _, p := range a.LFunc {
if err := p(a); err != nil {
panic("[PANIC] agent SetUp failed. error:" + err.Error())
}
}
return a
}
func (a *Agent) RegisterHandler(handlers ...common.AgentHandler) {
if len(handlers) > 0 {
for _, handler := range handlers {
a.Handlers = append(a.Handlers, handler)
}
} else {
return
}
a.Handlers = handlers
}
func (a *Agent) Start() error {
if err := a.running(); err != nil {
return err
}
a.Wg = new(sync.WaitGroup)
a.Wg.Add(1)
go a.signalBusBooting(a.Wg)
a.Wg.Wait()
a.ShutDown()
return nil
}
func (a *Agent) signalBusBooting(wg *sync.WaitGroup) {
defer wg.Done()
if a.BeatFreQ == 0 {
a.BeatFreQ = 10 * time.Minute
}
log.Println("[INFO] signalBus boot...")
for {
select {
case <-a.SigBus.StopS:
a.Stop()
log.Println("[INFO] agent stopped")
return
case <-a.SigBus.RestartS:
a.Restart()
log.Println("[INFO] agent restarted")
case <-time.After(a.BeatFreQ):
log.Println("[INFO] agent heart beating")
}
}
}
func (a *Agent) running() error {
if a.isRunning {
return nil
}
a.Context, a.Cancel = context.WithCancel(context.Background())
for _, p := range a.Launchers {
if err := p.Run(); err != nil {
return err
}
}
for _, handler := range a.Handlers {
if err := handler.PreHandle(a.Context); err != nil {
log.Println(err.Error())
panic("[PANIC] agent RegisterHandler failed")
}
}
handlerParam := a.fillHandlerParam()
runMode := common.ModePoll
if a.ConfigL.Profile.Client.Type == common.ModeWatch {
runMode = common.ModeWatch
}
for _, handler := range a.Handlers {
handler.SetRunMode(runMode)
if err := handler.PostHandle(handlerParam, a.Context); err != nil {
return err
}
}
a.isRunning = true
return nil
}
func (a *Agent) Restart() {
if a.isRunning {
a.Stop()
}
if err := a.running(); err != nil {
log.Println(err.Error())
log.Println("[PANIC] agent Restart failed")
}
}
func (a *Agent) Stop() {
if !a.isRunning {
return
}
for _, p := range a.Launchers {
p.Stop()
}
a.Cancel()
hLen := len(a.Handlers)
for i := hLen - 1; i >= 0; i-- {
handler := a.Handlers[i]
if err := handler.AfterCompletion(a.Context); err != nil {
log.Println(err.Error())
}
}
a.isRunning = false
}
func (a *Agent) ShutDown() {
for _, p := range a.Launchers {
p.Shutdown()
}
time.Sleep(1 * time.Second)
log.Println("[INFO] agent shutdown")
a.LogFile.Close()
}
func (a *Agent) fillHandlerParam() *common.HandlerParam {
param := &common.HandlerParam{
Address: a.ConfigL.Profile.Server.Address,
Cluster: a.ConfigL.Profile.Server.Cluster,
ClientIp: a.ConfigL.Profile.Client.Ip,
AllInOne: a.ConfigL.Profile.Client.AllInOne,
Apps: make([]*common.App, 0),
}
for _, app := range a.ConfigL.Profile.Apps {
param.Apps = append(param.Apps, &common.App{
AppId: app.AppId,
Namespaces: app.Namespaces,
Secret: app.Secret,
PollInterval: app.PollInterval,
FileName: app.InOneFile,
Syntax: app.Syntax,
})
}
return param
}