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update vendor

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Signed-off-by: Roland.Ma <rolandma@yunify.com>
This commit is contained in:
Roland.Ma
2021-08-11 07:10:14 +00:00
parent a18f72b565
commit ea8f47c73a
2901 changed files with 269317 additions and 43103 deletions
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278
vendor/golang.org/x/net/http2/transport.go generated vendored
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@@ -93,7 +93,7 @@ type Transport struct {
// send in the initial settings frame. It is how many bytes
// of response headers are allowed. Unlike the http2 spec, zero here
// means to use a default limit (currently 10MB). If you actually
// want to advertise an ulimited value to the peer, Transport
// want to advertise an unlimited value to the peer, Transport
// interprets the highest possible value here (0xffffffff or 1<<32-1)
// to mean no limit.
MaxHeaderListSize uint32
@@ -108,6 +108,19 @@ type Transport struct {
// waiting for their turn.
StrictMaxConcurrentStreams bool
// ReadIdleTimeout is the timeout after which a health check using ping
// frame will be carried out if no frame is received on the connection.
// Note that a ping response will is considered a received frame, so if
// there is no other traffic on the connection, the health check will
// be performed every ReadIdleTimeout interval.
// If zero, no health check is performed.
ReadIdleTimeout time.Duration
// PingTimeout is the timeout after which the connection will be closed
// if a response to Ping is not received.
// Defaults to 15s.
PingTimeout time.Duration
// t1, if non-nil, is the standard library Transport using
// this transport. Its settings are used (but not its
// RoundTrip method, etc).
@@ -131,14 +144,31 @@ func (t *Transport) disableCompression() bool {
return t.DisableCompression || (t.t1 != nil && t.t1.DisableCompression)
}
func (t *Transport) pingTimeout() time.Duration {
if t.PingTimeout == 0 {
return 15 * time.Second
}
return t.PingTimeout
}
// ConfigureTransport configures a net/http HTTP/1 Transport to use HTTP/2.
// It returns an error if t1 has already been HTTP/2-enabled.
//
// Use ConfigureTransports instead to configure the HTTP/2 Transport.
func ConfigureTransport(t1 *http.Transport) error {
_, err := configureTransport(t1)
_, err := ConfigureTransports(t1)
return err
}
func configureTransport(t1 *http.Transport) (*Transport, error) {
// ConfigureTransports configures a net/http HTTP/1 Transport to use HTTP/2.
// It returns a new HTTP/2 Transport for further configuration.
// It returns an error if t1 has already been HTTP/2-enabled.
func ConfigureTransports(t1 *http.Transport) (*Transport, error) {
return configureTransports(t1)
}
func configureTransports(t1 *http.Transport) (*Transport, error) {
connPool := new(clientConnPool)
t2 := &Transport{
ConnPool: noDialClientConnPool{connPool},
@@ -227,6 +257,7 @@ type ClientConn struct {
br *bufio.Reader
fr *Framer
lastActive time.Time
lastIdle time.Time // time last idle
// Settings from peer: (also guarded by mu)
maxFrameSize uint32
maxConcurrentStreams uint32
@@ -533,12 +564,12 @@ func canRetryError(err error) bool {
return false
}
func (t *Transport) dialClientConn(addr string, singleUse bool) (*ClientConn, error) {
func (t *Transport) dialClientConn(ctx context.Context, addr string, singleUse bool) (*ClientConn, error) {
host, _, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
tconn, err := t.dialTLS()("tcp", addr, t.newTLSConfig(host))
tconn, err := t.dialTLS(ctx)("tcp", addr, t.newTLSConfig(host))
if err != nil {
return nil, err
}
@@ -559,34 +590,24 @@ func (t *Transport) newTLSConfig(host string) *tls.Config {
return cfg
}
func (t *Transport) dialTLS() func(string, string, *tls.Config) (net.Conn, error) {
func (t *Transport) dialTLS(ctx context.Context) func(string, string, *tls.Config) (net.Conn, error) {
if t.DialTLS != nil {
return t.DialTLS
}
return t.dialTLSDefault
}
func (t *Transport) dialTLSDefault(network, addr string, cfg *tls.Config) (net.Conn, error) {
cn, err := tls.Dial(network, addr, cfg)
if err != nil {
return nil, err
}
if err := cn.Handshake(); err != nil {
return nil, err
}
if !cfg.InsecureSkipVerify {
if err := cn.VerifyHostname(cfg.ServerName); err != nil {
return func(network, addr string, cfg *tls.Config) (net.Conn, error) {
tlsCn, err := t.dialTLSWithContext(ctx, network, addr, cfg)
if err != nil {
return nil, err
}
state := tlsCn.ConnectionState()
if p := state.NegotiatedProtocol; p != NextProtoTLS {
return nil, fmt.Errorf("http2: unexpected ALPN protocol %q; want %q", p, NextProtoTLS)
}
if !state.NegotiatedProtocolIsMutual {
return nil, errors.New("http2: could not negotiate protocol mutually")
}
return tlsCn, nil
}
state := cn.ConnectionState()
if p := state.NegotiatedProtocol; p != NextProtoTLS {
return nil, fmt.Errorf("http2: unexpected ALPN protocol %q; want %q", p, NextProtoTLS)
}
if !state.NegotiatedProtocolIsMutual {
return nil, errors.New("http2: could not negotiate protocol mutually")
}
return cn, nil
}
// disableKeepAlives reports whether connections should be closed as
@@ -603,7 +624,7 @@ func (t *Transport) expectContinueTimeout() time.Duration {
}
func (t *Transport) NewClientConn(c net.Conn) (*ClientConn, error) {
return t.newClientConn(c, false)
return t.newClientConn(c, t.disableKeepAlives())
}
func (t *Transport) newClientConn(c net.Conn, singleUse bool) (*ClientConn, error) {
@@ -667,6 +688,7 @@ func (t *Transport) newClientConn(c net.Conn, singleUse bool) (*ClientConn, erro
cc.inflow.add(transportDefaultConnFlow + initialWindowSize)
cc.bw.Flush()
if cc.werr != nil {
cc.Close()
return nil, cc.werr
}
@@ -674,6 +696,20 @@ func (t *Transport) newClientConn(c net.Conn, singleUse bool) (*ClientConn, erro
return cc, nil
}
func (cc *ClientConn) healthCheck() {
pingTimeout := cc.t.pingTimeout()
// We don't need to periodically ping in the health check, because the readLoop of ClientConn will
// trigger the healthCheck again if there is no frame received.
ctx, cancel := context.WithTimeout(context.Background(), pingTimeout)
defer cancel()
err := cc.Ping(ctx)
if err != nil {
cc.closeForLostPing()
cc.t.connPool().MarkDead(cc)
return
}
}
func (cc *ClientConn) setGoAway(f *GoAwayFrame) {
cc.mu.Lock()
defer cc.mu.Unlock()
@@ -736,7 +772,8 @@ func (cc *ClientConn) idleStateLocked() (st clientConnIdleState) {
}
st.canTakeNewRequest = cc.goAway == nil && !cc.closed && !cc.closing && maxConcurrentOkay &&
int64(cc.nextStreamID)+2*int64(cc.pendingRequests) < math.MaxInt32
int64(cc.nextStreamID)+2*int64(cc.pendingRequests) < math.MaxInt32 &&
!cc.tooIdleLocked()
st.freshConn = cc.nextStreamID == 1 && st.canTakeNewRequest
return
}
@@ -746,6 +783,16 @@ func (cc *ClientConn) canTakeNewRequestLocked() bool {
return st.canTakeNewRequest
}
// tooIdleLocked reports whether this connection has been been sitting idle
// for too much wall time.
func (cc *ClientConn) tooIdleLocked() bool {
// The Round(0) strips the monontonic clock reading so the
// times are compared based on their wall time. We don't want
// to reuse a connection that's been sitting idle during
// VM/laptop suspend if monotonic time was also frozen.
return cc.idleTimeout != 0 && !cc.lastIdle.IsZero() && time.Since(cc.lastIdle.Round(0)) > cc.idleTimeout
}
// onIdleTimeout is called from a time.AfterFunc goroutine. It will
// only be called when we're idle, but because we're coming from a new
// goroutine, there could be a new request coming in at the same time,
@@ -834,14 +881,12 @@ func (cc *ClientConn) sendGoAway() error {
return nil
}
// Close closes the client connection immediately.
//
// In-flight requests are interrupted. For a graceful shutdown, use Shutdown instead.
func (cc *ClientConn) Close() error {
// closes the client connection immediately. In-flight requests are interrupted.
// err is sent to streams.
func (cc *ClientConn) closeForError(err error) error {
cc.mu.Lock()
defer cc.cond.Broadcast()
defer cc.mu.Unlock()
err := errors.New("http2: client connection force closed via ClientConn.Close")
for id, cs := range cc.streams {
select {
case cs.resc <- resAndError{err: err}:
@@ -854,6 +899,20 @@ func (cc *ClientConn) Close() error {
return cc.tconn.Close()
}
// Close closes the client connection immediately.
//
// In-flight requests are interrupted. For a graceful shutdown, use Shutdown instead.
func (cc *ClientConn) Close() error {
err := errors.New("http2: client connection force closed via ClientConn.Close")
return cc.closeForError(err)
}
// closes the client connection immediately. In-flight requests are interrupted.
func (cc *ClientConn) closeForLostPing() error {
err := errors.New("http2: client connection lost")
return cc.closeForError(err)
}
const maxAllocFrameSize = 512 << 10
// frameBuffer returns a scratch buffer suitable for writing DATA frames.
@@ -904,7 +963,7 @@ func commaSeparatedTrailers(req *http.Request) (string, error) {
k = http.CanonicalHeaderKey(k)
switch k {
case "Transfer-Encoding", "Trailer", "Content-Length":
return "", &badStringError{"invalid Trailer key", k}
return "", fmt.Errorf("invalid Trailer key %q", k)
}
keys = append(keys, k)
}
@@ -936,7 +995,7 @@ func checkConnHeaders(req *http.Request) error {
if vv := req.Header["Transfer-Encoding"]; len(vv) > 0 && (len(vv) > 1 || vv[0] != "" && vv[0] != "chunked") {
return fmt.Errorf("http2: invalid Transfer-Encoding request header: %q", vv)
}
if vv := req.Header["Connection"]; len(vv) > 0 && (len(vv) > 1 || vv[0] != "" && !strings.EqualFold(vv[0], "close") && !strings.EqualFold(vv[0], "keep-alive")) {
if vv := req.Header["Connection"]; len(vv) > 0 && (len(vv) > 1 || vv[0] != "" && !asciiEqualFold(vv[0], "close") && !asciiEqualFold(vv[0], "keep-alive")) {
return fmt.Errorf("http2: invalid Connection request header: %q", vv)
}
return nil
@@ -992,7 +1051,7 @@ func (cc *ClientConn) roundTrip(req *http.Request) (res *http.Response, gotErrAf
req.Method != "HEAD" {
// Request gzip only, not deflate. Deflate is ambiguous and
// not as universally supported anyway.
// See: http://www.gzip.org/zlib/zlib_faq.html#faq38
// See: https://zlib.net/zlib_faq.html#faq39
//
// Note that we don't request this for HEAD requests,
// due to a bug in nginx:
@@ -1021,6 +1080,15 @@ func (cc *ClientConn) roundTrip(req *http.Request) (res *http.Response, gotErrAf
bodyWriter := cc.t.getBodyWriterState(cs, body)
cs.on100 = bodyWriter.on100
defer func() {
cc.wmu.Lock()
werr := cc.werr
cc.wmu.Unlock()
if werr != nil {
cc.Close()
}
}()
cc.wmu.Lock()
endStream := !hasBody && !hasTrailers
werr := cc.writeHeaders(cs.ID, endStream, int(cc.maxFrameSize), hdrs)
@@ -1070,6 +1138,9 @@ func (cc *ClientConn) roundTrip(req *http.Request) (res *http.Response, gotErrAf
// we can keep it.
bodyWriter.cancel()
cs.abortRequestBodyWrite(errStopReqBodyWrite)
if hasBody && !bodyWritten {
<-bodyWriter.resc
}
}
if re.err != nil {
cc.forgetStreamID(cs.ID)
@@ -1090,6 +1161,7 @@ func (cc *ClientConn) roundTrip(req *http.Request) (res *http.Response, gotErrAf
} else {
bodyWriter.cancel()
cs.abortRequestBodyWrite(errStopReqBodyWriteAndCancel)
<-bodyWriter.resc
}
cc.forgetStreamID(cs.ID)
return nil, cs.getStartedWrite(), errTimeout
@@ -1099,6 +1171,7 @@ func (cc *ClientConn) roundTrip(req *http.Request) (res *http.Response, gotErrAf
} else {
bodyWriter.cancel()
cs.abortRequestBodyWrite(errStopReqBodyWriteAndCancel)
<-bodyWriter.resc
}
cc.forgetStreamID(cs.ID)
return nil, cs.getStartedWrite(), ctx.Err()
@@ -1108,6 +1181,7 @@ func (cc *ClientConn) roundTrip(req *http.Request) (res *http.Response, gotErrAf
} else {
bodyWriter.cancel()
cs.abortRequestBodyWrite(errStopReqBodyWriteAndCancel)
<-bodyWriter.resc
}
cc.forgetStreamID(cs.ID)
return nil, cs.getStartedWrite(), errRequestCanceled
@@ -1117,6 +1191,7 @@ func (cc *ClientConn) roundTrip(req *http.Request) (res *http.Response, gotErrAf
// forgetStreamID.
return nil, cs.getStartedWrite(), cs.resetErr
case err := <-bodyWriter.resc:
bodyWritten = true
// Prefer the read loop's response, if available. Issue 16102.
select {
case re := <-readLoopResCh:
@@ -1127,7 +1202,6 @@ func (cc *ClientConn) roundTrip(req *http.Request) (res *http.Response, gotErrAf
cc.forgetStreamID(cs.ID)
return nil, cs.getStartedWrite(), err
}
bodyWritten = true
if d := cc.responseHeaderTimeout(); d != 0 {
timer := time.NewTimer(d)
defer timer.Stop()
@@ -1150,6 +1224,7 @@ func (cc *ClientConn) awaitOpenSlotForRequest(req *http.Request) error {
}
return errClientConnUnusable
}
cc.lastIdle = time.Time{}
if int64(len(cc.streams))+1 <= int64(cc.maxConcurrentStreams) {
if waitingForConn != nil {
close(waitingForConn)
@@ -1216,6 +1291,8 @@ var (
// abort request body write, but send stream reset of cancel.
errStopReqBodyWriteAndCancel = errors.New("http2: canceling request")
errReqBodyTooLong = errors.New("http2: request body larger than specified content length")
)
func (cs *clientStream) writeRequestBody(body io.Reader, bodyCloser io.Closer) (err error) {
@@ -1238,10 +1315,32 @@ func (cs *clientStream) writeRequestBody(body io.Reader, bodyCloser io.Closer) (
req := cs.req
hasTrailers := req.Trailer != nil
remainLen := actualContentLength(req)
hasContentLen := remainLen != -1
var sawEOF bool
for !sawEOF {
n, err := body.Read(buf)
n, err := body.Read(buf[:len(buf)-1])
if hasContentLen {
remainLen -= int64(n)
if remainLen == 0 && err == nil {
// The request body's Content-Length was predeclared and
// we just finished reading it all, but the underlying io.Reader
// returned the final chunk with a nil error (which is one of
// the two valid things a Reader can do at EOF). Because we'd prefer
// to send the END_STREAM bit early, double-check that we're actually
// at EOF. Subsequent reads should return (0, EOF) at this point.
// If either value is different, we return an error in one of two ways below.
var n1 int
n1, err = body.Read(buf[n:])
remainLen -= int64(n1)
}
if remainLen < 0 {
err = errReqBodyTooLong
cc.writeStreamReset(cs.ID, ErrCodeCancel, err)
return err
}
}
if err == io.EOF {
sawEOF = true
err = nil
@@ -1357,13 +1456,6 @@ func (cs *clientStream) awaitFlowControl(maxBytes int) (taken int32, err error)
}
}
type badStringError struct {
what string
str string
}
func (e *badStringError) Error() string { return fmt.Sprintf("%s %q", e.what, e.str) }
// requires cc.mu be held.
func (cc *ClientConn) encodeHeaders(req *http.Request, addGzipHeader bool, trailers string, contentLength int64) ([]byte, error) {
cc.hbuf.Reset()
@@ -1429,19 +1521,21 @@ func (cc *ClientConn) encodeHeaders(req *http.Request, addGzipHeader bool, trail
var didUA bool
for k, vv := range req.Header {
if strings.EqualFold(k, "host") || strings.EqualFold(k, "content-length") {
if asciiEqualFold(k, "host") || asciiEqualFold(k, "content-length") {
// Host is :authority, already sent.
// Content-Length is automatic, set below.
continue
} else if strings.EqualFold(k, "connection") || strings.EqualFold(k, "proxy-connection") ||
strings.EqualFold(k, "transfer-encoding") || strings.EqualFold(k, "upgrade") ||
strings.EqualFold(k, "keep-alive") {
} else if asciiEqualFold(k, "connection") ||
asciiEqualFold(k, "proxy-connection") ||
asciiEqualFold(k, "transfer-encoding") ||
asciiEqualFold(k, "upgrade") ||
asciiEqualFold(k, "keep-alive") {
// Per 8.1.2.2 Connection-Specific Header
// Fields, don't send connection-specific
// fields. We have already checked if any
// are error-worthy so just ignore the rest.
continue
} else if strings.EqualFold(k, "user-agent") {
} else if asciiEqualFold(k, "user-agent") {
// Match Go's http1 behavior: at most one
// User-Agent. If set to nil or empty string,
// then omit it. Otherwise if not mentioned,
@@ -1454,7 +1548,29 @@ func (cc *ClientConn) encodeHeaders(req *http.Request, addGzipHeader bool, trail
if vv[0] == "" {
continue
}
} else if asciiEqualFold(k, "cookie") {
// Per 8.1.2.5 To allow for better compression efficiency, the
// Cookie header field MAY be split into separate header fields,
// each with one or more cookie-pairs.
for _, v := range vv {
for {
p := strings.IndexByte(v, ';')
if p < 0 {
break
}
f("cookie", v[:p])
p++
// strip space after semicolon if any.
for p+1 <= len(v) && v[p] == ' ' {
p++
}
v = v[p:]
}
if len(v) > 0 {
f("cookie", v)
}
}
continue
}
for _, v := range vv {
@@ -1491,7 +1607,12 @@ func (cc *ClientConn) encodeHeaders(req *http.Request, addGzipHeader bool, trail
// Header list size is ok. Write the headers.
enumerateHeaders(func(name, value string) {
name = strings.ToLower(name)
name, ascii := asciiToLower(name)
if !ascii {
// Skip writing invalid headers. Per RFC 7540, Section 8.1.2, header
// field names have to be ASCII characters (just as in HTTP/1.x).
return
}
cc.writeHeader(name, value)
if traceHeaders {
traceWroteHeaderField(trace, name, value)
@@ -1539,9 +1660,14 @@ func (cc *ClientConn) encodeTrailers(req *http.Request) ([]byte, error) {
}
for k, vv := range req.Trailer {
lowKey, ascii := asciiToLower(k)
if !ascii {
// Skip writing invalid headers. Per RFC 7540, Section 8.1.2, header
// field names have to be ASCII characters (just as in HTTP/1.x).
continue
}
// Transfer-Encoding, etc.. have already been filtered at the
// start of RoundTrip
lowKey := strings.ToLower(k)
for _, v := range vv {
cc.writeHeader(lowKey, v)
}
@@ -1557,6 +1683,7 @@ func (cc *ClientConn) writeHeader(name, value string) {
}
type resAndError struct {
_ incomparable
res *http.Response
err error
}
@@ -1592,6 +1719,7 @@ func (cc *ClientConn) streamByID(id uint32, andRemove bool) *clientStream {
delete(cc.streams, id)
if len(cc.streams) == 0 && cc.idleTimer != nil {
cc.idleTimer.Reset(cc.idleTimeout)
cc.lastIdle = time.Now()
}
close(cs.done)
// Wake up checkResetOrDone via clientStream.awaitFlowControl and
@@ -1603,6 +1731,7 @@ func (cc *ClientConn) streamByID(id uint32, andRemove bool) *clientStream {
// clientConnReadLoop is the state owned by the clientConn's frame-reading readLoop.
type clientConnReadLoop struct {
_ incomparable
cc *ClientConn
closeWhenIdle bool
}
@@ -1682,8 +1811,17 @@ func (rl *clientConnReadLoop) run() error {
rl.closeWhenIdle = cc.t.disableKeepAlives() || cc.singleUse
gotReply := false // ever saw a HEADERS reply
gotSettings := false
readIdleTimeout := cc.t.ReadIdleTimeout
var t *time.Timer
if readIdleTimeout != 0 {
t = time.AfterFunc(readIdleTimeout, cc.healthCheck)
defer t.Stop()
}
for {
f, err := cc.fr.ReadFrame()
if t != nil {
t.Reset(readIdleTimeout)
}
if err != nil {
cc.vlogf("http2: Transport readFrame error on conn %p: (%T) %v", cc, err, err)
}
@@ -1832,7 +1970,9 @@ func (rl *clientConnReadLoop) handleResponse(cs *clientStream, f *MetaHeadersFra
return nil, errors.New("malformed response from server: malformed non-numeric status pseudo header")
}
header := make(http.Header)
regularFields := f.RegularFields()
strs := make([]string, len(regularFields))
header := make(http.Header, len(regularFields))
res := &http.Response{
Proto: "HTTP/2.0",
ProtoMajor: 2,
@@ -1840,7 +1980,7 @@ func (rl *clientConnReadLoop) handleResponse(cs *clientStream, f *MetaHeadersFra
StatusCode: statusCode,
Status: status + " " + http.StatusText(statusCode),
}
for _, hf := range f.RegularFields() {
for _, hf := range regularFields {
key := http.CanonicalHeaderKey(hf.Name)
if key == "Trailer" {
t := res.Trailer
@@ -1852,7 +1992,18 @@ func (rl *clientConnReadLoop) handleResponse(cs *clientStream, f *MetaHeadersFra
t[http.CanonicalHeaderKey(v)] = nil
})
} else {
header[key] = append(header[key], hf.Value)
vv := header[key]
if vv == nil && len(strs) > 0 {
// More than likely this will be a single-element key.
// Most headers aren't multi-valued.
// Set the capacity on strs[0] to 1, so any future append
// won't extend the slice into the other strings.
vv, strs = strs[:1:1], strs[1:]
vv[0] = hf.Value
header[key] = vv
} else {
header[key] = append(vv, hf.Value)
}
}
}
@@ -1882,8 +2033,8 @@ func (rl *clientConnReadLoop) handleResponse(cs *clientStream, f *MetaHeadersFra
if !streamEnded || isHead {
res.ContentLength = -1
if clens := res.Header["Content-Length"]; len(clens) == 1 {
if clen64, err := strconv.ParseInt(clens[0], 10, 64); err == nil {
res.ContentLength = clen64
if cl, err := strconv.ParseUint(clens[0], 10, 63); err == nil {
res.ContentLength = int64(cl)
} else {
// TODO: care? unlike http/1, it won't mess up our framing, so it's
// more safe smuggling-wise to ignore.
@@ -2138,8 +2289,6 @@ func (rl *clientConnReadLoop) processData(f *DataFrame) error {
return nil
}
var errInvalidTrailers = errors.New("http2: invalid trailers")
func (rl *clientConnReadLoop) endStream(cs *clientStream) {
// TODO: check that any declared content-length matches, like
// server.go's (*stream).endStream method.
@@ -2370,7 +2519,6 @@ func (cc *ClientConn) writeStreamReset(streamID uint32, code ErrCode, err error)
var (
errResponseHeaderListSize = errors.New("http2: response header list larger than advertised limit")
errRequestHeaderListSize = errors.New("http2: request header list larger than peer's advertised limit")
errPseudoTrailers = errors.New("http2: invalid pseudo header in trailers")
)
func (cc *ClientConn) logf(format string, args ...interface{}) {
@@ -2404,11 +2552,13 @@ func strSliceContains(ss []string, s string) bool {
type erringRoundTripper struct{ err error }
func (rt erringRoundTripper) RoundTripErr() error { return rt.err }
func (rt erringRoundTripper) RoundTrip(*http.Request) (*http.Response, error) { return nil, rt.err }
// gzipReader wraps a response body so it can lazily
// call gzip.NewReader on the first call to Read
type gzipReader struct {
_ incomparable
body io.ReadCloser // underlying Response.Body
zr *gzip.Reader // lazily-initialized gzip reader
zerr error // sticky error
@@ -2484,7 +2634,9 @@ func (t *Transport) getBodyWriterState(cs *clientStream, body io.Reader) (s body
func (s bodyWriterState) cancel() {
if s.timer != nil {
s.timer.Stop()
if s.timer.Stop() {
s.resc <- nil
}
}
}