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serve.go
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serve.go
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// Copyright 2020 Changkun Ou. All rights reserved.
// Use of this source code is governed by a GPL-3.0
// license that can be found in the LICENSE file.
package daemon
import (
"context"
"log"
"net"
"os"
"os/signal"
"sync"
"time"
"changkun.de/x/midgard/internal/config"
"changkun.de/x/midgard/internal/types"
"changkun.de/x/midgard/internal/types/proto"
"changkun.de/x/midgard/internal/utils"
"github.com/gorilla/websocket"
"google.golang.org/grpc"
)
// Daemon is the midgard daemon that interact with midgard server.
type Daemon struct {
ID string
sync.Mutex
s *grpc.Server
ws *websocket.Conn
readChs sync.Map // {string: chan *types.WebsocketMessage}
writeCh chan *types.WebsocketMessage // writeCh is used for sending message along ws.
proto.UnimplementedMidgardServer
}
// NewDaemon creates a new midgard daemon
func NewDaemon() *Daemon {
id, err := os.Hostname()
if err != nil {
id = utils.NewUUID()
}
return &Daemon{
ID: id,
writeCh: make(chan *types.WebsocketMessage, 10),
}
}
// Serve serves Daemon daemon:
// 1. maintaining midgard daemon rpc;
// 2. maintaining midgard daemon to server websocket.
func (m *Daemon) Serve() {
ctx, cancel := context.WithCancel(context.Background())
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
defer func() {
log.Println("graceful shutdown assistant is terminated.")
}()
q := make(chan os.Signal, 1)
signal.Notify(q, os.Interrupt, os.Kill)
sig := <-q
log.Printf("%v", sig)
log.Printf("shutting down midgard daemon ...")
m.s.GracefulStop()
cancel()
}()
go func() {
defer func() {
log.Println("websocket is terminated.")
}()
m.wsConnect()
m.handleIO(ctx)
m.wsClose()
}()
wg.Add(1)
go func() {
defer wg.Done()
defer func() {
log.Println("clipboard watcher is terminated.")
}()
m.watchLocalClipboard(ctx)
}()
wg.Add(1)
go func() {
defer wg.Done()
defer func() {
log.Println("rpc server is terminated.")
}()
m.serveRPC()
}()
wg.Wait()
log.Printf("daemon is down, good bye!")
}
const maxMessageSize = 10 << 20 // 10 MB
func (m *Daemon) serveRPC() {
l, err := net.Listen("tcp", config.D().Addr)
if err != nil {
log.Fatalf("fail to initalize midgard daemon, err: %v", err)
}
m.s = grpc.NewServer(
grpc.MaxMsgSize(maxMessageSize),
grpc.MaxRecvMsgSize(maxMessageSize),
grpc.MaxSendMsgSize(maxMessageSize),
grpc.ConnectionTimeout(time.Minute*5),
)
proto.RegisterMidgardServer(m.s, m)
log.Printf("daemon running at rpc://%s", config.D().Addr)
if err := m.s.Serve(l); err != nil {
log.Fatalf("fail to serve midgard daemon, err: %v", err)
}
}