Source: flow.go in package golang.org/x/net/http2

Source File
	flow.go

Belonging Package
	golang.org/x/net/http2

Flow control


package http2

flow is the flow control window's size.

type flow struct {
	_ incomparable

n is the number of DATA bytes we're allowed to send. A flow is kept both on a conn and a per-stream.

	n int32

conn points to the shared connection-level flow that is shared by all streams on that conn. It is nil for the flow that's on the conn directly.

	conn *flow
}

func (f *flow) setConnFlow(cf *flow) { f.conn = cf }

func (f *flow) available() int32 {
	n := f.n
	if f.conn != nil && f.conn.n < n {
		n = f.conn.n
	}
	return n
}

func (f *flow) take(n int32) {
	if n > f.available() {
		panic("internal error: took too much")
	}
	f.n -= n
	if f.conn != nil {
		f.conn.n -= n
	}
}

add adds n bytes (positive or negative) to the flow control window. It returns false if the sum would exceed 2^31-1.

func (f *flow) add(n int32) bool {
	sum := f.n + n
	if (sum > n) == (f.n > 0) {
		f.n = sum
		return true
	}
	return false


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