use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/lucas-clemente/quic-go/streams_map_incoming_generic.go

@@ -0,0 +1,129 @@
+package quic
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/wire"
+)
+
+//go:generate genny -in $GOFILE -out streams_map_incoming_bidi.go gen "item=streamI Item=BidiStream"
+//go:generate genny -in $GOFILE -out streams_map_incoming_uni.go gen "item=receiveStreamI Item=UniStream"
+type incomingItemsMap struct {
+	mutex sync.RWMutex
+	cond  sync.Cond
+
+	streams map[protocol.StreamID]item
+
+	nextStream    protocol.StreamID // the next stream that will be returned by AcceptStream()
+	highestStream protocol.StreamID // the highest stream that the peer openend
+	maxStream     protocol.StreamID // the highest stream that the peer is allowed to open
+	maxNumStreams int               // maximum number of streams
+
+	newStream        func(protocol.StreamID) item
+	queueMaxStreamID func(*wire.MaxStreamIDFrame)
+
+	closeErr error
+}
+
+func newIncomingItemsMap(
+	nextStream protocol.StreamID,
+	initialMaxStreamID protocol.StreamID,
+	maxNumStreams int,
+	queueControlFrame func(wire.Frame),
+	newStream func(protocol.StreamID) item,
+) *incomingItemsMap {
+	m := &incomingItemsMap{
+		streams:          make(map[protocol.StreamID]item),
+		nextStream:       nextStream,
+		maxStream:        initialMaxStreamID,
+		maxNumStreams:    maxNumStreams,
+		newStream:        newStream,
+		queueMaxStreamID: func(f *wire.MaxStreamIDFrame) { queueControlFrame(f) },
+	}
+	m.cond.L = &m.mutex
+	return m
+}
+
+func (m *incomingItemsMap) AcceptStream() (item, error) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	var str item
+	for {
+		var ok bool
+		if m.closeErr != nil {
+			return nil, m.closeErr
+		}
+		str, ok = m.streams[m.nextStream]
+		if ok {
+			break
+		}
+		m.cond.Wait()
+	}
+	m.nextStream += 4
+	return str, nil
+}
+
+func (m *incomingItemsMap) GetOrOpenStream(id protocol.StreamID) (item, error) {
+	m.mutex.RLock()
+	if id > m.maxStream {
+		m.mutex.RUnlock()
+		return nil, fmt.Errorf("peer tried to open stream %d (current limit: %d)", id, m.maxStream)
+	}
+	// if the id is smaller than the highest we accepted
+	// * this stream exists in the map, and we can return it, or
+	// * this stream was already closed, then we can return the nil
+	if id <= m.highestStream {
+		s := m.streams[id]
+		m.mutex.RUnlock()
+		return s, nil
+	}
+	m.mutex.RUnlock()
+
+	m.mutex.Lock()
+	// no need to check the two error conditions from above again
+	// * maxStream can only increase, so if the id was valid before, it definitely is valid now
+	// * highestStream is only modified by this function
+	var start protocol.StreamID
+	if m.highestStream == 0 {
+		start = m.nextStream
+	} else {
+		start = m.highestStream + 4
+	}
+	for newID := start; newID <= id; newID += 4 {
+		m.streams[newID] = m.newStream(newID)
+		m.cond.Signal()
+	}
+	m.highestStream = id
+	s := m.streams[id]
+	m.mutex.Unlock()
+	return s, nil
+}
+
+func (m *incomingItemsMap) DeleteStream(id protocol.StreamID) error {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	if _, ok := m.streams[id]; !ok {
+		return fmt.Errorf("Tried to delete unknown stream %d", id)
+	}
+	delete(m.streams, id)
+	// queue a MAX_STREAM_ID frame, giving the peer the option to open a new stream
+	if numNewStreams := m.maxNumStreams - len(m.streams); numNewStreams > 0 {
+		m.maxStream = m.highestStream + protocol.StreamID(numNewStreams*4)
+		m.queueMaxStreamID(&wire.MaxStreamIDFrame{StreamID: m.maxStream})
+	}
+	return nil
+}
+
+func (m *incomingItemsMap) CloseWithError(err error) {
+	m.mutex.Lock()
+	m.closeErr = err
+	for _, str := range m.streams {
+		str.closeForShutdown(err)
+	}
+	m.mutex.Unlock()
+	m.cond.Broadcast()
+}