e7435725af
Instead, provide a variant of instrumentedResponseWriter that does not implement CloseNotifier, and use that when necessary. In copyFullPayload, log instead of panicing when we encounter something that doesn't implement CloseNotifier. This is more complicated than I'd like, but it's necessary because instrumentedResponseWriter must not embed CloseNotifier unless there's really a CloseNotifier to embed. Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
62 lines
2.1 KiB
Go
62 lines
2.1 KiB
Go
package handlers
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import (
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"errors"
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"io"
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"net/http"
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ctxu "github.com/docker/distribution/context"
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"github.com/docker/distribution/registry/api/errcode"
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)
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// closeResources closes all the provided resources after running the target
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// handler.
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func closeResources(handler http.Handler, closers ...io.Closer) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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for _, closer := range closers {
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defer closer.Close()
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}
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handler.ServeHTTP(w, r)
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})
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}
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// copyFullPayload copies the payload of a HTTP request to destWriter. If it
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// receives less content than expected, and the client disconnected during the
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// upload, it avoids sending a 400 error to keep the logs cleaner.
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func copyFullPayload(responseWriter http.ResponseWriter, r *http.Request, destWriter io.Writer, context ctxu.Context, action string, errSlice *errcode.Errors) error {
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// Get a channel that tells us if the client disconnects
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var clientClosed <-chan bool
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if notifier, ok := responseWriter.(http.CloseNotifier); ok {
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clientClosed = notifier.CloseNotify()
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} else {
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ctxu.GetLogger(context).Warn("the ResponseWriter does not implement CloseNotifier")
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}
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// Read in the data, if any.
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copied, err := io.Copy(destWriter, r.Body)
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if clientClosed != nil && (err != nil || (r.ContentLength > 0 && copied < r.ContentLength)) {
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// Didn't recieve as much content as expected. Did the client
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// disconnect during the request? If so, avoid returning a 400
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// error to keep the logs cleaner.
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select {
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case <-clientClosed:
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// Set the response code to "499 Client Closed Request"
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// Even though the connection has already been closed,
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// this causes the logger to pick up a 499 error
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// instead of showing 0 for the HTTP status.
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responseWriter.WriteHeader(499)
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ctxu.GetLogger(context).Error("client disconnected during " + action)
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return errors.New("client disconnected")
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default:
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}
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}
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if err != nil {
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ctxu.GetLogger(context).Errorf("unknown error reading request payload: %v", err)
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*errSlice = append(*errSlice, errcode.ErrorCodeUnknown.WithDetail(err))
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return err
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}
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return nil
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}
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