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window_update_queue.go
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window_update_queue.go
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package quic
import (
"sync"
"github.com/quic-go/quic-go/internal/flowcontrol"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/wire"
)
type windowUpdateQueue struct {
mutex sync.Mutex
queue map[protocol.StreamID]struct{} // used as a set
queuedConn bool // connection-level window update
streamGetter streamGetter
connFlowController flowcontrol.ConnectionFlowController
callback func(wire.Frame)
}
func newWindowUpdateQueue(
streamGetter streamGetter,
connFC flowcontrol.ConnectionFlowController,
cb func(wire.Frame),
) *windowUpdateQueue {
return &windowUpdateQueue{
queue: make(map[protocol.StreamID]struct{}),
streamGetter: streamGetter,
connFlowController: connFC,
callback: cb,
}
}
func (q *windowUpdateQueue) AddStream(id protocol.StreamID) {
q.mutex.Lock()
q.queue[id] = struct{}{}
q.mutex.Unlock()
}
func (q *windowUpdateQueue) AddConnection() {
q.mutex.Lock()
q.queuedConn = true
q.mutex.Unlock()
}
func (q *windowUpdateQueue) QueueAll() {
q.mutex.Lock()
// queue a connection-level window update
if q.queuedConn {
q.callback(&wire.MaxDataFrame{MaximumData: q.connFlowController.GetWindowUpdate()})
q.queuedConn = false
}
// queue all stream-level window updates
for id := range q.queue {
delete(q.queue, id)
str, err := q.streamGetter.GetOrOpenReceiveStream(id)
if err != nil || str == nil { // the stream can be nil if it was completed before dequeing the window update
continue
}
offset := str.getWindowUpdate()
if offset == 0 { // can happen if we received a final offset, right after queueing the window update
continue
}
q.callback(&wire.MaxStreamDataFrame{
StreamID: id,
MaximumStreamData: offset,
})
}
q.mutex.Unlock()
}