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server.go
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server.go
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package server
import (
"bytes"
"github.com/fsnotify/fsnotify"
"github.com/kr/binarydist"
"github.com/pkg/errors"
"github.com/wangkechun/vv/pkg/editor"
"github.com/wangkechun/vv/pkg/header"
pb "github.com/wangkechun/vv/pkg/proto"
context "golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/reflection"
"io/ioutil"
"net"
"os"
"os/exec"
"path/filepath"
"qiniupkg.com/x/log.v7"
"time"
)
const splitFileSize = 1024 * 100
const defaultConnectionNum = 1
// server is used to implement helloworld.GreeterServer.
type fileServer struct {
name string
}
// SayHello implements helloworld.GreeterServer
func (s *fileServer) Ping(ctx context.Context, in *pb.PingRequest) (out *pb.PingReply, err error) {
log.Info("recv Ping")
return &pb.PingReply{Name: s.name}, nil
}
func (s *fileServer) OpenFileStream(stream pb.VvServer_OpenFileStreamServer) (err error) {
log.Info("recv OpenFileStream")
// TODO:更好的处理文件重名问题
msg, err := stream.Recv()
if err != nil {
return errors.Wrap(err, "stream.Recv")
}
fileName := filepath.Join(os.TempDir(), msg.FileName)
fileWriter, err := os.OpenFile(fileName, os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return errors.Wrap(err, "os.OpenFile")
}
defer fileWriter.Close()
_, err = fileWriter.Write(msg.Content)
if err != nil {
return errors.Wrap(err, "fileWriter.Write")
}
for {
msg, err := stream.Recv()
if err != nil {
return errors.Wrap(err, "stream.Recv")
}
if msg.IsEnd {
break
}
_, err = fileWriter.Write(msg.Content)
if err != nil {
return errors.Wrap(err, "fileWriter.Write")
}
}
fileWriter.Close()
log.Info("recv split file success")
defer os.Remove(fileName)
content, err := ioutil.ReadFile(fileName)
if err != nil {
return errors.Wrap(err, "ioutil.ReadFile")
}
s.openAndWatchFile(fileName, stream, content)
return
}
func (s *fileServer) openAndWatchFile(fileName string, stream pb.VvServer_OpenFileServer, content []byte) (err error) {
command := editor.Cmd(fileName)
log.Info("run", command)
ctx, cancel := context.WithCancel(stream.Context())
defer cancel()
cmd := exec.CommandContext(ctx, "sh", "-c", command)
err = cmd.Start()
if err != nil {
return errors.Wrap(err, "open editor error")
}
go func() {
cmd.Wait()
log.Info("close editor")
cancel()
}()
watcher, err := fsnotify.NewWatcher()
if err != nil {
return errors.Wrap(err, "fsnotify.NewWatcher")
}
watcher.Add(fileName)
defer watcher.Close()
lastContnet := content
for {
select {
case <-ctx.Done():
return grpc.Errorf(codes.Aborted, "editor or client closed")
case event := <-watcher.Events:
if event.Op&fsnotify.Write == fsnotify.Write {
log.Println("modified file:", event.Name)
// TODO: bsdiff 支持
buf, err := ioutil.ReadFile(fileName)
if err != nil {
return errors.Wrap(err, "read file error")
}
if bytes.Compare(lastContnet, buf) == 0 {
continue
}
if len(buf) > splitFileSize {
// TODO: 大文件bsdiff很慢
patch := &bytes.Buffer{}
err = binarydist.Diff(bytes.NewReader(lastContnet), bytes.NewReader(buf), patch)
if err != nil {
return errors.Wrap(err, "binarydist.Diff")
}
log.Infof("server, file %s change , push diff, diff size: %d", fileName, len(patch.Bytes()))
err = stream.Send(&pb.OpenFileReply{
Content: patch.Bytes(),
IsBsdiff: true,
})
if err != nil {
log.Error("send file error", err)
return err
}
} else {
lastContnet = buf
log.Infof("server, file %s change , push it", fileName)
err = stream.Send(&pb.OpenFileReply{
Content: lastContnet,
})
if err != nil {
log.Error("send file error", err)
return err
}
}
}
case err := <-watcher.Errors:
log.Error("watch file error", err)
return err
}
}
}
func (s *fileServer) OpenFile(in *pb.OpenFileRequest, stream pb.VvServer_OpenFileServer) (err error) {
log.Info("recv OpenFile")
// TODO:更好的处理文件重名问题
fileName := filepath.Join(os.TempDir(), in.FileName)
err = ioutil.WriteFile(fileName, in.Content, 0600)
if err != nil {
return errors.Wrap(err, "write file")
}
defer os.Remove(fileName)
log.Info("write file", fileName)
return s.openAndWatchFile(fileName, stream, in.Content)
}
// Server 组件
type Server struct {
cfg Config
}
// Config Server 配置
type Config struct {
RegistryAddrRPC string
RegistryAddrTCP string
Name string
}
// New 返回一个Server
func New(cfg Config) *Server {
r := &Server{cfg: cfg}
return r
}
// Run 启动
func (r *Server) Run() (err error) {
ctx := context.Background()
for {
func() error {
log.Info("connecting to", r.cfg.RegistryAddrRPC)
conn, err := grpc.Dial(r.cfg.RegistryAddrRPC, grpc.WithInsecure())
if err != nil {
return errors.Wrap(err, "dial error")
}
defer conn.Close()
c := pb.NewVvRegistryClient(conn)
stream, err := c.OpenListen(ctx, &pb.OpenListenRequest{User: r.cfg.Name})
if err != nil {
return errors.Wrap(err, "OpenListen")
}
for {
log.Info("connecting success")
_, err := stream.Recv()
if err != nil {
return errors.Wrap(err, "stream.Recv")
}
srv := &fileServer{
name: r.cfg.Name,
}
s := grpc.NewServer()
pb.RegisterVvServerServer(s, srv)
reflection.Register(s)
log.Info("dial", r.cfg.RegistryAddrTCP)
conn, err := net.Dial("tcp", r.cfg.RegistryAddrTCP)
if err != nil {
return errors.Wrap(err, "net.Dial")
}
header.WriteHeader(conn, &pb.ProtoHeader{
ConnKind: pb.ProtoHeader_LISTEN,
User: r.cfg.Name,
})
go func() {
err = s.Serve(&listen{conn: conn})
if err != nil {
log.Error(err)
}
}()
}
}()
if err != nil {
log.Error("dial error", err)
time.Sleep(time.Second)
continue
}
}
}