/
server.go
136 lines (119 loc) · 2.31 KB
/
server.go
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package rvt
import (
"context"
"errors"
"io"
"sync"
tcell "github.com/gdamore/tcell/v2"
"github.com/rs/zerolog"
"golang.org/x/sync/errgroup"
)
type Screen interface {
tcell.Screen
Subscribe(id string, ch chan string)
Unsubscribe(id string)
}
type Server struct {
ctx context.Context
screen Screen
id string
done chan struct{}
wg sync.WaitGroup
}
func NewServer(ctx context.Context, screen Screen, id string) *Server {
return &Server{
ctx: ctx,
screen: screen,
id: id,
done: make(chan struct{}),
}
}
func (s *Server) Cancel() {
close(s.done)
}
func (s *Server) Close() error {
s.wg.Wait()
return nil
}
func (s *Server) Share(srv Screen_ShareServer) error {
ctx := s.ctx
s.wg.Add(1)
recvMsgs := make(chan *ShareMessage)
go func() {
defer s.wg.Done()
defer close(recvMsgs)
for {
shareMsg, err := srv.Recv()
if err != nil {
if !errors.Is(err, io.EOF) {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to receive share message")
}
return
}
select {
case <-s.done:
return
case recvMsgs <- shareMsg:
}
}
}()
s.wg.Add(1)
sendMsgs := make(chan *ShareMessage)
go func() {
defer s.wg.Done()
for msg := range sendMsgs {
err := srv.Send(msg)
if err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to send share message")
continue
}
}
}()
eg := new(errgroup.Group)
var subscribeOnce sync.Once
renderCh := make(chan string, 16)
eg.Go(func() error {
for {
var shareMsg *ShareMessage
select {
case <-s.done:
return nil
case shareMsg = <-recvMsgs:
}
if shareMsg == nil {
return nil
}
switch msg := shareMsg.Message.(type) {
case *ShareMessage_Init:
subscribeOnce.Do(func() {
zerolog.Ctx(ctx).Info().Str("id", shareMsg.Id).Msg("New screen subscriber")
s.screen.Subscribe(shareMsg.Id, renderCh)
renderCh <- "init"
})
case *ShareMessage_Event:
ev := ProtoToEvent(msg.Event)
s.screen.PostEvent(&RemoteEvent{
ID: shareMsg.Id,
Event: ev,
})
}
}
})
eg.Go(func() error {
defer close(sendMsgs)
for {
select {
case <-s.done:
return nil
case <-renderCh:
sendMsgs <- &ShareMessage{
Id: s.id,
Message: &ShareMessage_Render{
Render: ScreenToRender(s.screen),
},
}
}
}
})
return eg.Wait()
}