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local_server.go
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local_server.go
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package boot
import (
"fmt"
localrpc "github.com/al8n/micro-boot/internal/rpc"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
"net"
"os"
"os/signal"
"sync"
"syscall"
)
type localServer struct {
name string
external Booter
server *grpc.Server
serverOpts []grpc.ServerOption
dialOpts []grpc.DialOption
ln net.Listener
mu sync.Mutex
exiting bool
daemon bool
force bool
gracefulSignal chan os.Signal
forceSignal chan os.Signal
}
func (l *localServer) Stop(stream localrpc.Boot_StopServer) error {
for {
req, _ := stream.Recv()
if req.Force {
_ = stream.Send(&localrpc.StopResponse{Errno: -1, Msg: forceStopMessage(l.name)})
l.mu.Lock()
l.forceStop()
l.mu.Unlock()
return nil
} else {
_ = stream.Send(&localrpc.StopResponse{Errno: 0, Msg: stopMessage(l.name)})
l.mu.Lock()
if l.exiting {
l.forceSignal <- syscall.SIGTERM
} else {
l.exiting = true
l.gracefulSignal <- syscall.SIGTERM
}
l.mu.Unlock()
}
}
}
func (l *localServer) gracefulStop() {
logrus.Info(stopMessage(l.name))
l.external.Close()
logrus.Info(gracefulStopMessage(l.name))
l.ln.Close()
return
}
func (l *localServer) forceStop() {
logrus.Error(forceStopMessage(l.name))
l.ln.Close()
}
func (l *localServer) listenForcefulStop() {
select {
case <-l.forceSignal:
go l.forceStop()
break
}
}
func (l *localServer) listenGracefulStop() {
select {
case <-l.gracefulSignal:
go l.gracefulStop()
break
}
}
func (l *localServer) listenSystemCall() {
c := make(chan os.Signal, 2)
signal.Notify(c, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
for s := range c {
switch s {
case syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT:
l.mu.Lock()
if l.exiting {
l.forceSignal <- s
} else {
l.exiting = true
l.gracefulSignal <- s
}
l.mu.Unlock()
}
}
}
func (l *localServer) serve() (err error) {
go l.listenGracefulStop()
go l.listenForcefulStop()
go l.listenSystemCall()
l.ln, err = net.Listen("unix", socketPath(l.name))
if err != nil {
return
}
l.server = grpc.NewServer(l.serverOpts...)
localrpc.RegisterBootServer(l.server, l)
err = l.external.Serve()
if err != nil {
return
}
_ = l.server.Serve(l.ln)
return
}
func logPath(dir, name string) string {
return fmt.Sprintf("%s/%s.log", dir, name)
}
func socketPath(name string) string {
return fmt.Sprintf("%s/%s.sock", daemonPath, name)
}
func stopMessage(name string) string {
return fmt.Sprintf("Stopping %s services...", name)
}
func forceStopMessage(name string) string {
return fmt.Sprintf("%s services are forced to stop!", name)
}
func gracefulStopMessage(name string) string {
return fmt.Sprintf("%s services are stopped gracefully", name)
}