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Add pause/resume to protocol #36
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package remotedialer | ||
|
|
||
| import ( | ||
| "sync" | ||
| ) | ||
|
|
||
| type backPressure struct { | ||
| cond sync.Cond | ||
| c *connection | ||
| paused bool | ||
| } | ||
|
|
||
| func newBackPressure(c *connection) *backPressure { | ||
| return &backPressure{ | ||
| cond: sync.Cond{ | ||
| L: &sync.Mutex{}, | ||
| }, | ||
| c: c, | ||
| paused: false, | ||
| } | ||
| } | ||
|
|
||
| func (b *backPressure) OnPause() { | ||
| b.cond.L.Lock() | ||
| defer b.cond.L.Unlock() | ||
|
|
||
| b.paused = true | ||
| b.cond.Broadcast() | ||
| } | ||
|
|
||
| func (b *backPressure) OnResume() { | ||
| b.cond.L.Lock() | ||
| defer b.cond.L.Unlock() | ||
|
|
||
| b.paused = false | ||
| b.cond.Broadcast() | ||
| } | ||
|
|
||
| func (b *backPressure) Pause() error { | ||
| b.cond.L.Lock() | ||
| defer b.cond.L.Unlock() | ||
| if b.paused { | ||
| return nil | ||
| } | ||
| if _, err := b.c.Pause(); err != nil { | ||
| return err | ||
| } | ||
| b.paused = true | ||
| return nil | ||
| } | ||
|
|
||
| func (b *backPressure) Resume() error { | ||
| b.cond.L.Lock() | ||
| defer b.cond.L.Unlock() | ||
| if !b.paused { | ||
| return nil | ||
| } | ||
| if _, err := b.c.Resume(); err != nil { | ||
| return err | ||
| } | ||
| b.paused = false | ||
| return nil | ||
| } | ||
|
|
||
| func (b *backPressure) Wait() { | ||
| b.cond.L.Lock() | ||
| defer b.cond.L.Unlock() | ||
|
|
||
| for b.paused { | ||
| b.cond.Wait() | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| package remotedialer | ||
|
|
||
| import ( | ||
| "context" | ||
| "io/ioutil" | ||
| "net" | ||
| "net/http" | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func TestExceedBuffer(t *testing.T) { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
|
|
||
| producerAddress, err := newTestProducer(ctx) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| serverAddress, server, err := newTestServer(ctx) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| if err := newTestClient(ctx, "ws://"+serverAddress); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| client := http.Client{ | ||
| Transport: &http.Transport{ | ||
| DialContext: func(ctx context.Context, proto, address string) (net.Conn, error) { | ||
| return server.Dialer("client")(ctx, proto, address) | ||
| }, | ||
| }, | ||
| } | ||
|
|
||
| producerURL := "http://" + producerAddress | ||
|
|
||
| resp, err := client.Get(producerURL) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| resp2, err := client.Get(producerURL) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| defer resp2.Body.Close() | ||
|
|
||
| resp2Body, err := ioutil.ReadAll(resp2.Body) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| respBody, err := ioutil.ReadAll(resp.Body) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| assert.Equal(t, 4096*4096, len(resp2Body)) | ||
| assert.Equal(t, 4096*4096, len(respBody)) | ||
| } | ||
|
|
||
| func newTestServer(ctx context.Context) (string, *Server, error) { | ||
| auth := func(req *http.Request) (clientKey string, authed bool, err error) { | ||
| return "client", true, nil | ||
| } | ||
|
|
||
| server := New(auth, DefaultErrorWriter) | ||
| address, err := newServer(ctx, server) | ||
| return address, server, err | ||
| } | ||
|
|
||
| func newTestClient(ctx context.Context, url string) error { | ||
| result := make(chan error, 2) | ||
| go func() { | ||
| err := ConnectToProxy(ctx, url, nil, func(proto, address string) bool { | ||
| return true | ||
| }, nil, func(ctx context.Context, session *Session) error { | ||
| result <- nil | ||
| return nil | ||
| }) | ||
| result <- err | ||
| }() | ||
| return <-result | ||
| } | ||
|
|
||
| func newServer(ctx context.Context, handler http.Handler) (string, error) { | ||
| server := http.Server{ | ||
| BaseContext: func(_ net.Listener) context.Context { | ||
| return ctx | ||
| }, | ||
| Handler: handler, | ||
| } | ||
| listener, err := net.Listen("tcp", "localhost:0") | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| go func() { | ||
| <-ctx.Done() | ||
| listener.Close() | ||
| server.Shutdown(context.Background()) | ||
| }() | ||
| go server.Serve(listener) | ||
| return listener.Addr().String(), nil | ||
| } | ||
|
|
||
| func newTestProducer(ctx context.Context) (string, error) { | ||
| buffer := make([]byte, 4096) | ||
| return newServer(ctx, http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) { | ||
| for i := 0; i < 4096; i++ { | ||
| if _, err := resp.Write(buffer); err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
| })) | ||
| } |
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Need an advanced sync lecture for this... 😲
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how do you mean?