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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http2
import (
"reflect"
"testing"
)
func TestRoundRobinScheduler(t *testing.T) {
const maxFrameSize = 16
sc := &serverConn{maxFrameSize: maxFrameSize}
ws := newRoundRobinWriteScheduler()
streams := make([]*stream, 4)
for i := range streams {
streamID := uint32(i) + 1
streams[i] = &stream{
id: streamID,
sc: sc,
}
streams[i].flow.add(1 << 20) // arbitrary large value
ws.OpenStream(streamID, OpenStreamOptions{})
wr := FrameWriteRequest{
write: &writeData{
streamID: streamID,
p: make([]byte, maxFrameSize*(i+1)),
endStream: false,
},
stream: streams[i],
}
ws.Push(wr)
}
const controlFrames = 2
for i := 0; i < controlFrames; i++ {
ws.Push(makeWriteNonStreamRequest())
}
// We should get the control frames first.
for i := 0; i < controlFrames; i++ {
wr, ok := ws.Pop()
if !ok || wr.StreamID() != 0 {
t.Fatalf("wr.Pop() = stream %v, %v; want 0, true", wr.StreamID(), ok)
}
}
// Each stream should write maxFrameSize bytes until it runs out of data.
// Stream 1 has one frame of data, 2 has two frames, etc.
want := []uint32{1, 2, 3, 4, 2, 3, 4, 3, 4, 4}
var got []uint32
for {
wr, ok := ws.Pop()
if !ok {
break
}
if wr.DataSize() != maxFrameSize {
t.Fatalf("wr.Pop() = %v data bytes, want %v", wr.DataSize(), maxFrameSize)
}
got = append(got, wr.StreamID())
}
if !reflect.DeepEqual(got, want) {
t.Fatalf("popped streams %v, want %v", got, want)
}
}