110 lines
3.6 KiB
Go
110 lines
3.6 KiB
Go
package flowcontrol
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import (
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"time"
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"github.com/lucas-clemente/quic-go/congestion"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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var _ = Describe("Connection Flow controller", func() {
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var controller *connectionFlowController
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// update the congestion such that it returns a given value for the smoothed RTT
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setRtt := func(t time.Duration) {
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controller.rttStats.UpdateRTT(t, 0, time.Now())
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Expect(controller.rttStats.SmoothedRTT()).To(Equal(t)) // make sure it worked
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}
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BeforeEach(func() {
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controller = &connectionFlowController{}
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controller.rttStats = &congestion.RTTStats{}
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})
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Context("Constructor", func() {
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rttStats := &congestion.RTTStats{}
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It("sets the send and receive windows", func() {
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receiveWindow := protocol.ByteCount(2000)
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maxReceiveWindow := protocol.ByteCount(3000)
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fc := NewConnectionFlowController(receiveWindow, maxReceiveWindow, rttStats).(*connectionFlowController)
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Expect(fc.receiveWindow).To(Equal(receiveWindow))
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Expect(fc.maxReceiveWindowIncrement).To(Equal(maxReceiveWindow))
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})
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})
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Context("receive flow control", func() {
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It("increases the highestReceived by a given increment", func() {
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controller.highestReceived = 1337
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controller.IncrementHighestReceived(123)
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Expect(controller.highestReceived).To(Equal(protocol.ByteCount(1337 + 123)))
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})
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Context("getting window updates", func() {
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BeforeEach(func() {
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controller.receiveWindow = 100
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controller.receiveWindowIncrement = 60
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controller.maxReceiveWindowIncrement = 1000
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})
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It("gets a window update", func() {
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controller.AddBytesRead(80)
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offset := controller.GetWindowUpdate()
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Expect(offset).To(Equal(protocol.ByteCount(80 + 60)))
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})
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It("autotunes the window", func() {
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controller.AddBytesRead(80)
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setRtt(20 * time.Millisecond)
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controller.lastWindowUpdateTime = time.Now().Add(-35 * time.Millisecond)
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offset := controller.GetWindowUpdate()
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Expect(offset).To(Equal(protocol.ByteCount(80 + 2*60)))
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})
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})
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})
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Context("setting the minimum increment", func() {
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var (
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oldIncrement protocol.ByteCount
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receiveWindow protocol.ByteCount = 10000
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receiveWindowIncrement protocol.ByteCount = 600
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)
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BeforeEach(func() {
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controller.receiveWindow = receiveWindow
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controller.receiveWindowIncrement = receiveWindowIncrement
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oldIncrement = controller.receiveWindowIncrement
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controller.maxReceiveWindowIncrement = 3000
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})
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It("sets the minimum window increment", func() {
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controller.EnsureMinimumWindowIncrement(1000)
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Expect(controller.receiveWindowIncrement).To(Equal(protocol.ByteCount(1000)))
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})
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It("doesn't reduce the window increment", func() {
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controller.EnsureMinimumWindowIncrement(1)
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Expect(controller.receiveWindowIncrement).To(Equal(oldIncrement))
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})
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It("doens't increase the increment beyond the maxReceiveWindowIncrement", func() {
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max := controller.maxReceiveWindowIncrement
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controller.EnsureMinimumWindowIncrement(2 * max)
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Expect(controller.receiveWindowIncrement).To(Equal(max))
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})
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It("doesn't auto-tune the window after the increment was increased", func() {
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setRtt(20 * time.Millisecond)
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controller.bytesRead = 9900 // receive window is 10000
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controller.lastWindowUpdateTime = time.Now().Add(-20 * time.Millisecond)
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controller.EnsureMinimumWindowIncrement(912)
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offset := controller.getWindowUpdate()
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Expect(controller.receiveWindowIncrement).To(Equal(protocol.ByteCount(912))) // no auto-tuning
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Expect(offset).To(Equal(protocol.ByteCount(9900 + 912)))
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})
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})
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})
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