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simplify sending of (connection-level) BLOCKED frames

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This commit is contained in:
Marten Seemann
2017-12-18 14:54:09 +07:00
parent d49ad2d0cc
commit 092908d3e0
15 changed files with 80 additions and 148 deletions
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13
internal/flowcontrol/base_flow_controller.go
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@@ -11,8 +11,9 @@ import (
type baseFlowController struct {
// for sending data
bytesSent protocol.ByteCount
sendWindow protocol.ByteCount
bytesSent protocol.ByteCount
sendWindow protocol.ByteCount
lastBlockedAt protocol.ByteCount
// for receiving data
mutex sync.RWMutex
@@ -72,12 +73,14 @@ func (c *baseFlowController) getWindowUpdate() protocol.ByteCount {
return c.receiveWindow
}
// IsBlocked says if it is blocked by flow control.
// IsBlocked says if it is newly blocked by flow control.
// For every offset, it only returns true once.
// If it is blocked, the offset is returned.
func (c *baseFlowController) IsBlocked() (bool, protocol.ByteCount) {
if c.sendWindowSize() != 0 {
func (c *baseFlowController) IsNewlyBlocked() (bool, protocol.ByteCount) {
if c.sendWindowSize() != 0 || c.sendWindow == c.lastBlockedAt {
return false, 0
}
c.lastBlockedAt = c.sendWindow
return true, c.sendWindow
}

18
internal/flowcontrol/base_flow_controller_test.go
View File

@@ -52,12 +52,26 @@ var _ = Describe("Base Flow controller", func() {
It("says when it's blocked", func() {
controller.UpdateSendWindow(100)
Expect(controller.IsBlocked()).To(BeFalse())
Expect(controller.IsNewlyBlocked()).To(BeFalse())
controller.AddBytesSent(100)
blocked, offset := controller.IsBlocked()
blocked, offset := controller.IsNewlyBlocked()
Expect(blocked).To(BeTrue())
Expect(offset).To(Equal(protocol.ByteCount(100)))
})
It("doesn't say that it's newly blocked multiple times for the same offset", func() {
controller.UpdateSendWindow(100)
controller.AddBytesSent(100)
newlyBlocked, offset := controller.IsNewlyBlocked()
Expect(newlyBlocked).To(BeTrue())
Expect(offset).To(Equal(protocol.ByteCount(100)))
newlyBlocked, _ = controller.IsNewlyBlocked()
Expect(newlyBlocked).To(BeFalse())
controller.UpdateSendWindow(150)
controller.AddBytesSent(150)
newlyBlocked, offset = controller.IsNewlyBlocked()
Expect(newlyBlocked).To(BeTrue())
})
})
Context("receive flow control", func() {

2
internal/flowcontrol/interface.go
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@@ -5,7 +5,7 @@ import "github.com/lucas-clemente/quic-go/internal/protocol"
type flowController interface {
// for sending
SendWindowSize() protocol.ByteCount
IsBlocked() (bool, protocol.ByteCount)
IsNewlyBlocked() (bool, protocol.ByteCount)
UpdateSendWindow(protocol.ByteCount)
AddBytesSent(protocol.ByteCount)
// for receiving

4
internal/flowcontrol/stream_flow_controller_test.go
View File

@@ -233,9 +233,9 @@ var _ = Describe("Stream Flow controller", func() {
controller.connection.UpdateSendWindow(50)
controller.UpdateSendWindow(100)
controller.AddBytesSent(50)
blocked, _ := controller.connection.IsBlocked()
blocked, _ := controller.connection.IsNewlyBlocked()
Expect(blocked).To(BeTrue())
Expect(controller.IsBlocked()).To(BeFalse())
Expect(controller.IsNewlyBlocked()).To(BeFalse())
})
})
})