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stream_id.go
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stream_id.go
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package protocol
// A StreamID in QUIC
type StreamID uint64
// StreamType encodes if this is a unidirectional or bidirectional stream
type StreamType uint8
const (
// StreamTypeUni is a unidirectional stream
StreamTypeUni StreamType = iota
// StreamTypeBidi is a bidirectional stream
StreamTypeBidi
)
// InitiatedBy says if the stream was initiated by the client or by the server
func (s StreamID) InitiatedBy() Perspective {
if s%2 == 0 {
return PerspectiveClient
}
return PerspectiveServer
}
//Type says if this is a unidirectional or bidirectional stream
func (s StreamID) Type() StreamType {
if s%4 >= 2 {
return StreamTypeUni
}
return StreamTypeBidi
}
// StreamNum returns how many streams in total are below this
// Example: for stream 9 it returns 3 (i.e. streams 1, 5 and 9)
func (s StreamID) StreamNum() uint64 {
return uint64(s/4) + 1
}
// MaxStreamID is the highest stream ID that a peer is allowed to open,
// when it is allowed to open numStreams.
func MaxStreamID(stype StreamType, numStreams uint64, pers Perspective) StreamID {
if numStreams == 0 {
return 0
}
var first StreamID
switch stype {
case StreamTypeBidi:
switch pers {
case PerspectiveClient:
first = 0
case PerspectiveServer:
first = 1
}
case StreamTypeUni:
switch pers {
case PerspectiveClient:
first = 2
case PerspectiveServer:
first = 3
}
}
return first + 4*StreamID(numStreams-1)
}
// FirstStream returns the first valid stream ID
func FirstStream(stype StreamType, pers Perspective) StreamID {
return MaxStreamID(stype, 1, pers)
}