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broker.go
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broker.go
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package maatq
import (
"encoding/json"
"net/http"
"net/http/pprof"
"os"
"os/signal"
"syscall"
"time"
log "github.com/Sirupsen/logrus"
"github.com/go-redis/redis"
"github.com/google/uuid"
)
// 用于代理启动Workers和Scheduler,并且提供对外HTTP API
type Broker struct {
scheduler *Scheduler
group *WorkerGroup
config *BrokerOptions
inspector *healthChecker
redis *redis.Client
}
type BrokerOptions struct {
Parallel int
Addr string
Password string
Try int
Queues []string
Scheduler bool
HealthCheckInterval time.Duration
AlertReceiver string
}
func NewBroker(config *BrokerOptions) (*Broker, error) {
inspector := NewHealthChecker(config.HealthCheckInterval)
group, err := NewWorkerGroup(&GroupOptions{
Parallel: config.Parallel,
Addr: config.Addr,
Password: config.Password,
Try: config.Try,
Queues: config.Queues,
})
if err != nil {
return nil, err
}
broker := &Broker{
group: group,
config: config,
inspector: inspector,
redis: redis.NewClient(&redis.Options{
Addr: config.Addr,
Password: config.Password,
DB: 0,
}),
}
if config.Scheduler {
broker.scheduler = NewDefaultScheduler(config.Addr, config.Password)
if len(broker.config.AlertReceiver) > 0 {
log.Infof("报警邮件接受人设置为: %s", broker.config.AlertReceiver)
broker.scheduler.health.SetDeadFunc(NewEmailAlerter(broker.config.AlertReceiver))
}
broker.inspector.AddItem(broker.scheduler.health)
h, err := broker.scheduler.loads()
log.Debug("Loading dumps: ", h)
if err == nil && h != nil && h.Len() > 0 {
log.Debug("Dumps loaded")
broker.scheduler.heap = h
}
if err != nil {
log.Error("Dumps load error: ", err)
}
}
go broker.handleSignals()
return broker, nil
}
func (b *Broker) ServeLoop(addr string) {
ch := make(chan error)
go b.group.ServeLoop()
if b.config.Scheduler {
go b.scheduler.ServeLoop()
}
go b.ServeHttp(addr, ch)
go b.inspector.ServeLoop()
log.Error(<-ch)
}
func (b *Broker) ServeHttp(addr string, ch chan error) {
log.Info("Http serve: ", addr)
handler := b.newHttpServer()
ch <- http.ListenAndServe(addr, handler)
}
func (b *Broker) newHttpServer() http.Handler {
mux := http.NewServeMux()
mux.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
mux.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
mux.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
mux.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
mux.Handle("/debug/pprof/trace", http.HandlerFunc(pprof.Trace))
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
key := "/v1/messages/cancel/"
w.Header().Set("Server", "mataq/1.0")
if len(r.URL.Path) > len(key) && r.URL.Path[:len(key)] == key {
w.Header().Set("Content-Type", "application/json")
id := r.URL.Path[len(key):]
ok := b.scheduler.Cancel(id)
resp := response{
Ok: ok,
EventId: id,
}
json.NewEncoder(w).Encode(&resp)
} else {
w.WriteHeader(http.StatusNotFound)
w.Write([]byte("Not Found"))
}
})
mux.HandleFunc("/v1/messages/dispatch", func(w http.ResponseWriter, r *http.Request) {
var m Message
err := json.NewDecoder(r.Body).Decode(&m)
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Server", "mataq/1.0")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
resp := response{
Ok: false,
Err: err.Error(),
Code: 100,
}
json.NewEncoder(w).Encode(&resp)
return
}
id := uuid.New()
m.Id = id.String()
m.Timestamp = time.Now().Unix()
m.Try = 0
if err := b.Enqueue(m.GetWorkQueue(), &m); err != nil {
w.WriteHeader(http.StatusInternalServerError)
resp := response{
Ok: false,
Err: err.Error(),
Code: 101,
}
json.NewEncoder(w).Encode(&resp)
} else {
w.WriteHeader(http.StatusOK)
resp := response{
Ok: true,
EventId: m.Id,
}
json.NewEncoder(w).Encode(&resp)
}
})
mux.HandleFunc("/v1/messages/delay", func(w http.ResponseWriter, r *http.Request) {
var (
m Message
req delayRequest
)
err := json.NewDecoder(r.Body).Decode(&req)
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Server", "mataq/1.0")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
resp := response{
Ok: false,
Err: err.Error(),
Code: 100,
}
json.NewEncoder(w).Encode(&resp)
return
}
m.Id = uuid.New().String()
m.Event = req.Event
m.Data = req.Data
m.Timestamp = time.Now().Unix()
m.Try = 0
m.Queue = req.Queue
d, err := time.ParseDuration(req.Delay)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
resp := response{
Ok: false,
Err: err.Error(),
Code: 103,
}
json.NewEncoder(w).Encode(&resp)
return
}
b.scheduler.Delay(&m, d)
w.WriteHeader(http.StatusOK)
resp := response{
Ok: true,
EventId: m.Id,
}
json.NewEncoder(w).Encode(&resp)
})
mux.HandleFunc("/v1/messages/period", func(w http.ResponseWriter, r *http.Request) {
var (
m Message
req periodRequest
)
err := json.NewDecoder(r.Body).Decode(&req)
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Server", "mataq/1.0")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
resp := response{
Ok: false,
Err: err.Error(),
Code: 100,
}
json.NewEncoder(w).Encode(&resp)
return
}
m.Id = uuid.New().String()
m.Event = req.Event
m.Data = req.Data
m.Timestamp = time.Now().Unix()
m.Try = 0
m.Queue = req.Queue
p, err := NewPeriod(req.Period)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
resp := response{
Ok: false,
Err: err.Error(),
Code: 104,
}
json.NewEncoder(w).Encode(&resp)
return
}
b.scheduler.Period(&m, p)
w.WriteHeader(http.StatusOK)
resp := response{
Ok: true,
EventId: m.Id,
}
json.NewEncoder(w).Encode(&resp)
})
mux.HandleFunc("/v1/messages/crontab", func(w http.ResponseWriter, r *http.Request) {
var (
m Message
req crontabRequest
)
err := json.NewDecoder(r.Body).Decode(&req)
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Server", "mataq/1.0")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
resp := response{
Ok: false,
Err: err.Error(),
Code: 100,
}
json.NewEncoder(w).Encode(&resp)
return
}
m.Id = uuid.New().String()
m.Event = req.Event
m.Data = req.Data
m.Timestamp = time.Now().Unix()
m.Try = 0
m.Queue = req.Queue
cron, err := NewCrontab(req.Crontab)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
resp := response{
Ok: false,
Err: err.Error(),
Code: 105,
}
json.NewEncoder(w).Encode(&resp)
return
}
b.scheduler.Crontab(&m, cron)
w.WriteHeader(http.StatusOK)
resp := response{
Ok: true,
EventId: m.Id,
}
json.NewEncoder(w).Encode(&resp)
})
mux.HandleFunc("/v1/schedular/list", b.newHTTPHandlerForSchedularList())
return mux
}
func (b *Broker) newHTTPHandlerForSchedularList() func(w http.ResponseWriter, req *http.Request) {
return func(w http.ResponseWriter, req *http.Request) {
w.Write([]byte(b.scheduler.toJSON()))
}
}
func (b *Broker) Enqueue(queue string, m *Message) error {
data, err := json.Marshal(m)
if err != nil {
return err
}
cmd := b.redis.RPush(queue, data)
return cmd.Err()
}
func (b *Broker) AddEventHandler(event string, handler EventHandler) {
b.group.AddEventHandler(event, handler)
}
func (b *Broker) Delay(m *Message, d time.Duration) {
if b.config.Scheduler {
b.scheduler.Delay(m, d)
}
}
func (b *Broker) Period(m *Message, p *Period) {
if b.config.Scheduler {
b.scheduler.Period(m, p)
}
}
func (b *Broker) Crontab(m *Message, cron *Crontab) {
if b.config.Scheduler {
b.scheduler.Crontab(m, cron)
}
}
func (b *Broker) Dumps() error {
return b.scheduler.dumps()
}
// SchedularAvaiable 查询代理人是否支持任务调度器
func (b *Broker) SchedularAvaiable() bool {
return b.config.Scheduler && (b.scheduler != nil) && b.scheduler.isRunning
}
func (b *Broker) handleSignals() {
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGINT, syscall.SIGKILL, syscall.SIGTERM)
<-ch
log.Warn("Prepare to safe exit...")
if b.scheduler != nil {
log.Warn("Dumping heap...")
if err := b.scheduler.dumps(); err != nil {
log.Error("调度器保存错误: ", err)
}
}
b.group.cleanup()
os.Exit(0)
}