108 lines
3 KiB
Go
108 lines
3 KiB
Go
package git
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import (
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"compress/gzip"
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"context"
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"fmt"
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"io"
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"net/http"
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"sync"
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"github.com/golang/gddo/httputil"
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grpccodes "google.golang.org/grpc/codes"
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grpcstatus "google.golang.org/grpc/status"
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/api"
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/gitaly"
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/helper/fail"
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)
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func GetInfoRefsHandler(a *api.API) http.Handler {
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return repoPreAuthorizeHandler(a, handleGetInfoRefs)
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}
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func handleGetInfoRefs(rw http.ResponseWriter, r *http.Request, a *api.Response) {
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responseWriter := NewHttpResponseWriter(rw)
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// Log 0 bytes in because we ignore the request body (and there usually is none anyway).
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defer responseWriter.Log(r, 0)
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rpc := getService(r)
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if !(rpc == "git-upload-pack" || rpc == "git-receive-pack") {
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// The 'dumb' Git HTTP protocol is not supported
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http.Error(responseWriter, "Not Found", 404)
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return
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}
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responseWriter.Header().Set("Content-Type", fmt.Sprintf("application/x-%s-advertisement", rpc))
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responseWriter.Header().Set("Cache-Control", "no-cache")
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gitProtocol := r.Header.Get("Git-Protocol")
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offers := []string{"gzip", "identity"}
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encoding := httputil.NegotiateContentEncoding(r, offers)
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if err := handleGetInfoRefsWithGitaly(r.Context(), responseWriter, a, rpc, gitProtocol, encoding); err != nil {
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status := grpcstatus.Convert(err)
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err = fmt.Errorf("handleGetInfoRefs: %v", err)
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if status != nil && status.Code() == grpccodes.Unavailable {
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fail.Request(responseWriter, r, err, fail.WithStatus(http.StatusServiceUnavailable),
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fail.WithBody("The git server, Gitaly, is not available at this time. Please contact your administrator."))
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} else {
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fail.Request(responseWriter, r, err)
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}
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}
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}
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func handleGetInfoRefsWithGitaly(ctx context.Context, responseWriter *HttpResponseWriter, a *api.Response, rpc, gitProtocol, encoding string) error {
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ctx, smarthttp, err := gitaly.NewSmartHTTPClient(ctx, a.GitalyServer)
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if err != nil {
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return err
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}
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infoRefsResponseReader, err := smarthttp.InfoRefsResponseReader(ctx, &a.Repository, rpc, gitConfigOptions(a), gitProtocol)
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if err != nil {
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return err
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}
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var w io.WriteCloser = nopCloser{responseWriter}
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if encoding == "gzip" {
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gzWriter := getGzWriter(responseWriter)
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defer putGzWriter(gzWriter)
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w = gzWriter
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responseWriter.Header().Set("Content-Encoding", "gzip")
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}
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if _, err = io.Copy(w, infoRefsResponseReader); err != nil {
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return err
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}
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if err := w.Close(); err != nil {
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return err
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}
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return nil
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}
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var gzipPool = &sync.Pool{New: func() interface{} {
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// Invariant: the inner writer is io.Discard. We do not want to retain
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// response writers of past requests in the pool.
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return gzip.NewWriter(io.Discard)
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}}
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func getGzWriter(w io.Writer) *gzip.Writer {
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gzWriter := gzipPool.Get().(*gzip.Writer)
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gzWriter.Reset(w)
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return gzWriter
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}
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func putGzWriter(w *gzip.Writer) {
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w.Reset(io.Discard) // Maintain pool invariant
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gzipPool.Put(w)
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}
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type nopCloser struct{ io.Writer }
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func (nc nopCloser) Close() error { return nil }
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