67 lines
2.1 KiB
Go
67 lines
2.1 KiB
Go
package handlers
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import (
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"context"
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"errors"
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"io"
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"net/http"
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dcontext "github.com/docker/distribution/context"
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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 an 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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//
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// The copy will be limited to `limit` bytes, if limit is greater than zero.
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func copyFullPayload(ctx context.Context, responseWriter http.ResponseWriter, r *http.Request, destWriter io.Writer, limit int64, action string) error {
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// Get a channel that tells us if the client disconnects
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clientClosed := r.Context().Done()
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var body = r.Body
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if limit > 0 {
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body = http.MaxBytesReader(responseWriter, body, limit)
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}
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// Read in the data, if any.
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copied, err := io.Copy(destWriter, body)
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if clientClosed != nil && (err != nil || (r.ContentLength > 0 && copied < r.ContentLength)) {
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// Didn't receive 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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dcontext.GetLoggerWithFields(ctx, map[interface{}]interface{}{
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"error": err,
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"copied": copied,
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"contentLength": r.ContentLength,
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}, "error", "copied", "contentLength").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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dcontext.GetLogger(ctx).Errorf("unknown error reading request payload: %v", 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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