/
peer.go
184 lines (156 loc) · 3.52 KB
/
peer.go
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package protoo
import (
"encoding/json"
"errors"
"sync"
"sync/atomic"
"time"
"github.com/go-logr/logr"
)
type sentInfo struct {
id uint32
method string
respCh chan PeerResponse
}
type PeerResponse struct {
data json.RawMessage
err error
}
func (r PeerResponse) Unmarshal(v interface{}) error {
if r.err != nil {
return r.err
}
if len(r.data) == 0 {
return nil
}
return json.Unmarshal([]byte(r.data), v)
}
func (r PeerResponse) Data() []byte {
return []byte(r.data)
}
func (r PeerResponse) Err() error {
return r.err
}
type Peer struct {
IEventEmitter
logger logr.Logger
id string
transport Transport
sents sync.Map
data interface{}
closed uint32
closeCh chan struct{}
}
func NewPeer(peerId string, data interface{}, transport Transport) *Peer {
peer := &Peer{
IEventEmitter: NewEventEmitter(),
logger: NewLogger("Peer"),
id: peerId,
transport: transport,
data: data,
closeCh: make(chan struct{}),
}
if transport != nil {
peer.handleTransport()
}
return peer
}
func (peer *Peer) Id() string {
return peer.id
}
func (peer *Peer) Data() interface{} {
return peer.data
}
func (peer *Peer) Close() {
if !atomic.CompareAndSwapUint32(&peer.closed, 0, 1) {
return
}
close(peer.closeCh)
peer.transport.Close()
peer.SafeEmit("close")
peer.RemoveAllListeners()
}
func (peer *Peer) Request(method string, data interface{}) (rsp PeerResponse) {
request := CreateRequest(method, data)
sent := sentInfo{
id: request.Id,
method: method,
respCh: make(chan PeerResponse),
}
peer.sents.Store(sent.id, sent)
defer peer.sents.Delete(sent.id)
if err := peer.transport.Send(request.Marshal()); err != nil {
rsp.err = err
return
}
timer := time.NewTimer(15 * time.Second)
defer timer.Stop()
select {
case rsp = <-sent.respCh:
case <-timer.C:
rsp.err = errors.New("request timeout")
case <-peer.closeCh:
rsp.err = errors.New("peer closed")
}
return
}
func (peer *Peer) Notify(method string, data interface{}) error {
notification := CreateNotification(method, data)
return peer.transport.Send(notification.Marshal())
}
func (peer *Peer) handleTransport() {
if peer.transport.Closed() {
peer.Close()
return
}
peer.transport.On("close", func() {
peer.Close()
})
peer.transport.On("message", func(message Message) {
if message.Request {
peer.handleRequest(message)
} else if message.Response {
peer.handleResponse(message)
} else if message.Notification {
peer.handleNotification(message)
}
})
}
func (peer *Peer) handleRequest(request Message) {
peer.Emit("request", request, func(data interface{}) {
response := CreateSuccessResponse(request, data)
peer.transport.Send(response.Marshal())
}, func(err error) {
var anErr *Error
e1, ok := err.(*Error)
if ok {
anErr = e1
} else if e2, ok := err.(Error); ok {
anErr = &e2
} else {
anErr = NewError(500, err.Error())
}
response := CreateErrorResponse(request, anErr)
peer.transport.Send(response.Marshal())
})
}
func (peer *Peer) handleResponse(response Message) {
val, ok := peer.sents.Load(response.Id)
if !ok {
err := errors.New("bad response")
peer.logger.Error(err, "received response does not match any sent request", "id", response.Id)
return
}
if sent := val.(sentInfo); response.OK {
sent.respCh <- PeerResponse{
data: response.Data,
}
} else {
sent.respCh <- PeerResponse{
err: response.Error,
}
}
}
func (peer *Peer) handleNotification(notification Message) {
peer.Emit("notification", notification)
}