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runner.go
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runner.go
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package svc
import (
"context"
"fmt"
"os"
"os/signal"
"syscall"
"time"
"github.com/magicpool-co/pool/internal/log"
)
type HTTPServer interface {
ListenAndServe() error
RegisterOnShutdown(func())
Shutdown(context.Context) error
}
type TCPServer interface {
Serve()
Stop()
}
type WorkerServer interface {
Start()
Stop()
}
type Runner struct {
logger *log.Logger
done chan struct{}
httpServers []HTTPServer
tcpServers []TCPServer
workerServers []WorkerServer
}
func NewRunner(logger *log.Logger) *Runner {
runner := &Runner{
logger: logger,
done: make(chan struct{}),
httpServers: make([]HTTPServer, 0),
tcpServers: make([]TCPServer, 0),
workerServers: make([]WorkerServer, 0),
}
return runner
}
func (r *Runner) AddHTTPServer(server HTTPServer) {
r.httpServers = append(r.httpServers, server)
}
func (r *Runner) AddTCPServer(server TCPServer) {
r.tcpServers = append(r.tcpServers, server)
}
func (r *Runner) AddWorker(server WorkerServer) {
r.workerServers = append(r.workerServers, server)
}
// https://husobee.github.io/golang/ecs/2016/05/19/ecs-graceful-go-shutdown.html
func (r *Runner) Run() {
var returnCode = make(chan int)
var finishUP = make(chan struct{})
signal.Notify(r.logger.ExitChan, syscall.SIGTERM)
signal.Notify(r.logger.ExitChan, syscall.SIGINT)
go func() {
<-r.logger.ExitChan
r.logger.Debug("notified of graceful stop request")
finishUP <- struct{}{}
select {
case <-time.After(time.Minute):
r.logger.Error(fmt.Errorf("exiting with status 1"))
returnCode <- 1
case <-r.done:
r.logger.Debug("exiting with status 0")
returnCode <- 0
}
}()
go r.start()
<-finishUP
go r.stop()
os.Exit(<-returnCode)
}
func (r *Runner) start() {
for _, httpServer := range r.httpServers {
go httpServer.ListenAndServe()
httpServer.RegisterOnShutdown(func() {
signal.Notify(r.logger.ExitChan, syscall.SIGTERM)
})
}
for _, tcpServer := range r.tcpServers {
go tcpServer.Serve()
}
for _, workerServer := range r.workerServers {
workerServer.Start()
}
}
func (r *Runner) stop() {
for _, httpServer := range r.httpServers {
if err := httpServer.Shutdown(context.Background()); err != nil {
os.Exit(1)
}
}
for _, tcpServer := range r.tcpServers {
tcpServer.Stop()
}
for _, workerServer := range r.workerServers {
workerServer.Stop()
}
r.done <- struct{}{}
}