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service.go
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service.go
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package main
import (
"errors"
"io"
"strconv"
"google.golang.org/grpc/metadata"
log "github.com/Sirupsen/logrus"
)
import (
"game/client_handler"
"game/misc/packet"
. "game/proto"
"game/registry"
. "game/types"
)
var (
ERROR_INCORRECT_FRAME_TYPE = errors.New("incorrect frame type")
ERROR_SERVICE_NOT_BIND = errors.New("service not bind")
)
type server struct{}
// PIPELINE #1 stream receiver
// this function is to make the stream receiving SELECTABLE
func (s *server) recv(stream GameService_StreamServer, sess_die chan struct{}) chan *Game_Frame {
ch := make(chan *Game_Frame, 1)
go func() {
defer func() {
close(ch)
}()
for {
in, err := stream.Recv()
if err == io.EOF { // client closed
return
}
if err != nil {
log.Error(err)
return
}
select {
case ch <- in:
case <-sess_die:
}
}
}()
return ch
}
// PIPELINE #2 stream processing
// the center of game logic
func (s *server) Stream(stream GameService_StreamServer) error {
defer PrintPanicStack()
// session init
var sess Session
sess_die := make(chan struct{})
ch_agent := s.recv(stream, sess_die)
ch_ipc := make(chan *Game_Frame, DEFAULT_CH_IPC_SIZE)
defer func() {
registry.Unregister(sess.UserId, ch_ipc)
close(sess_die)
log.Debug("stream end:", sess.UserId)
}()
// read metadata from context
md, ok := metadata.FromContext(stream.Context())
if !ok {
log.Error("cannot read metadata from context")
return ERROR_INCORRECT_FRAME_TYPE
}
// read key
if len(md["userid"]) == 0 {
log.Error("cannot read key:userid from metadata")
return ERROR_INCORRECT_FRAME_TYPE
}
// parse userid
userid, err := strconv.Atoi(md["userid"][0])
if err != nil {
log.Error(err)
return ERROR_INCORRECT_FRAME_TYPE
}
// register user
sess.UserId = int32(userid)
registry.Register(sess.UserId, ch_ipc)
log.Debug("userid", sess.UserId, "logged in")
// >> main message loop <<
for {
select {
case frame, ok := <-ch_agent: // frames from agent
if !ok { // EOF
return nil
}
switch frame.Type {
case Game_Message: // the passthrough message from client->agent->game
// locate handler by proto number
reader := packet.Reader(frame.Message)
c, err := reader.ReadS16()
if err != nil {
log.Error(err)
return err
}
handle := client_handler.Handlers[c]
if handle == nil {
log.Error("service not bind:", c)
return ERROR_SERVICE_NOT_BIND
}
// handle request
ret := handle(&sess, reader)
// construct frame & return message from logic
if ret != nil {
if err := stream.Send(&Game_Frame{Type: Game_Message, Message: ret}); err != nil {
log.Error(err)
return err
}
}
// session control by logic
if sess.Flag&SESS_KICKED_OUT != 0 { // logic kick out
if err := stream.Send(&Game_Frame{Type: Game_Kick}); err != nil {
log.Error(err)
return err
}
return nil
}
case Game_Ping:
if err := stream.Send(&Game_Frame{Type: Game_Ping, Message: frame.Message}); err != nil {
log.Error(err)
return err
}
log.Debug("pinged")
default:
log.Error("incorrect frame type:", frame.Type)
return ERROR_INCORRECT_FRAME_TYPE
}
case frame := <-ch_ipc: // forward async messages from interprocess(goroutines) communication
if err := stream.Send(frame); err != nil {
log.Error(err)
return err
}
}
}
}