Migrate GetBlob to Gitaly

gitaly_test.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"encoding/base64"
 	"fmt"
 	"math/rand"
 	"net"
@@ -9,6 +10,7 @@ import (
 	"os"
 	"os/exec"
 	"path"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -324,6 +326,61 @@ func TestPostUploadPackHandledLocallyDueToEmptyGitalySocketPath(t *testing.T) {
 	testhelper.AssertResponseHeader(t, resp, "Content-Type", "application/x-git-upload-pack-result")
 }
 
+func TestGetBlobProxiedToGitalySuccessfully(t *testing.T) {
+	gitalyServer, socketPath := startGitalyServer(t, codes.OK)
+	defer gitalyServer.Stop()
+
+	gitalyAddress := "unix://" + socketPath
+	pathEncoded := base64.StdEncoding.EncodeToString([]byte("LICENSE"))
+	repoStorage := "default"
+	revisionEncoded := base64.StdEncoding.EncodeToString([]byte("54fcc214b94e78d7a41a9a8fe6d87a5e59500e51"))
+	repoRelativePath := "foo/bar.git"
+	jsonParams := fmt.Sprintf(`{"GitalyServer":{"Address":"%s","Token":""},"TreeEntryRequest":{"repository":{"storage_name":"%s","relative_path":"%s"},"revision":"%s","path":"%s"}}`,
+		gitalyAddress, repoStorage, repoRelativePath, revisionEncoded, pathEncoded)
+	expectedBody := testhelper.GitalyTreeEntryResponseMock
+	blobLength := len(expectedBody)
+
+	resp, body, err := doSendDataRequest("/something", "git-blob", jsonParams)
+	require.NoError(t, err)
+
+	assert.Equal(t, 200, resp.StatusCode, "GET %q: status code", resp.Request.URL)
+	assert.Equal(t, expectedBody, string(body), "GET %q: response body", resp.Request.URL)
+	assert.Equal(t, blobLength, len(body), "GET %q: body size", resp.Request.URL)
+	testhelper.AssertResponseHeader(t, resp, "Content-Length", strconv.Itoa(blobLength))
+}
+
+func TestGetBlobProxiedToGitalyInterruptedStream(t *testing.T) {
+	gitalyServer, socketPath := startGitalyServer(t, codes.OK)
+	defer gitalyServer.Stop()
+
+	gitalyAddress := "unix://" + socketPath
+	pathEncoded := base64.StdEncoding.EncodeToString([]byte("LICENSE"))
+	repoStorage := "default"
+	revisionEncoded := base64.StdEncoding.EncodeToString([]byte("54fcc214b94e78d7a41a9a8fe6d87a5e59500e51"))
+	repoRelativePath := "foo/bar.git"
+	jsonParams := fmt.Sprintf(`{"GitalyServer":{"Address":"%s","Token":""},"TreeEntryRequest":{"repository":{"storage_name":"%s","relative_path":"%s"},"revision":"%s","path":"%s"}}`,
+		gitalyAddress, repoStorage, repoRelativePath, revisionEncoded, pathEncoded)
+
+	resp, _, err := doSendDataRequest("/something", "git-blob", jsonParams)
+	require.NoError(t, err)
+
+	// This causes the server stream to be interrupted instead of consumed entirely.
+	resp.Body.Close()
+
+	done := make(chan struct{})
+	go func() {
+		gitalyServer.WaitGroup.Wait()
+		close(done)
+	}()
+
+	select {
+	case <-done:
+		return
+	case <-time.After(10 * time.Second):
+		t.Fatal("time out waiting for gitaly handler to return")
+	}
+}
+
 type combinedServer struct {
 	*grpc.Server
 	*testhelper.GitalyTestServer
@@ -340,6 +397,7 @@ func startGitalyServer(t *testing.T, finalMessageCode codes.Code) (*combinedServ
 
 	gitalyServer := testhelper.NewGitalyServer(finalMessageCode)
 	pb.RegisterSmartHTTPServer(server, gitalyServer)
+	pb.RegisterCommitServer(server, gitalyServer)
 
 	go server.Serve(listener)
 

internal/git/blob.go

@@ -7,12 +7,20 @@ import (
 	"net/http"
 	"strings"
 
+	"gitlab.com/gitlab-org/gitlab-workhorse/internal/gitaly"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/senddata"
+
+	pb "gitlab.com/gitlab-org/gitaly-proto/go"
 )
 
 type blob struct{ senddata.Prefix }
-type blobParams struct{ RepoPath, BlobId string }
+type blobParams struct {
+	RepoPath         string
+	BlobId           string
+	GitalyServer     gitaly.Server
+	TreeEntryRequest pb.TreeEntryRequest
+}
 
 var SendBlob = &blob{"git-blob:"}
 
@@ -23,6 +31,25 @@ func (b *blob) Inject(w http.ResponseWriter, r *http.Request, sendData string) {
 		return
 	}
 
+	if params.GitalyServer.Address != "" {
+		handleSendBlobWithGitaly(w, r, &params)
+	} else {
+		handleSendBlobLocally(w, r, &params)
+	}
+}
+
+func handleSendBlobWithGitaly(w http.ResponseWriter, r *http.Request, params *blobParams) {
+	commitClient, err := gitaly.NewCommitClient(params.GitalyServer)
+	if err != nil {
+		helper.Fail500(w, r, fmt.Errorf("commit.GetBlob: %v", err))
+	}
+
+	if err := commitClient.SendBlob(w, &params.TreeEntryRequest); err != nil {
+		helper.Fail500(w, r, fmt.Errorf("commit.GetBlob: %v", err))
+	}
+}
+
+func handleSendBlobLocally(w http.ResponseWriter, r *http.Request, params *blobParams) {
 	log.Printf("SendBlob: sending %q for %q", params.BlobId, r.URL.Path)
 
 	sizeOutput, err := gitCommand("", "", "git", "--git-dir="+params.RepoPath, "cat-file", "-s", params.BlobId).Output()

internal/gitaly/commit.go

+package gitaly
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"strconv"
+
+	pb "gitlab.com/gitlab-org/gitaly-proto/go"
+	pbhelper "gitlab.com/gitlab-org/gitaly-proto/go/helper"
+
+	"golang.org/x/net/context"
+)
+
+type CommitClient struct {
+	pb.CommitClient
+}
+
+func (client *CommitClient) SendBlob(w http.ResponseWriter, request *pb.TreeEntryRequest) error {
+	ctx, cancelFunc := context.WithCancel(context.Background())
+	defer cancelFunc()
+
+	c, err := client.TreeEntry(ctx, request)
+	if err != nil {
+		return fmt.Errorf("rpc failed: %v", err)
+	}
+
+	firstResponseReceived := false
+	rr := pbhelper.NewReceiveReader(func() ([]byte, error) {
+		resp, err := c.Recv()
+
+		if !firstResponseReceived && err == nil {
+			firstResponseReceived = true
+			w.Header().Set("Content-Length", strconv.FormatInt(resp.GetSize(), 10))
+		}
+
+		return resp.GetData(), err
+	})
+
+	if _, err := io.Copy(w, rr); err != nil {
+		return fmt.Errorf("copy rpc data: %v", err)
+	}
+
+	return nil
+}

internal/gitaly/gitaly.go

@@ -36,6 +36,15 @@ func NewSmartHTTPClient(server Server) (*SmartHTTPClient, error) {
 	return &SmartHTTPClient{grpcClient}, nil
 }
 
+func NewCommitClient(server Server) (*CommitClient, error) {
+	conn, err := getOrCreateConnection(server)
+	if err != nil {
+		return nil, err
+	}
+	grpcClient := pb.NewCommitClient(conn)
+	return &CommitClient{grpcClient}, nil
+}
+
 func getOrCreateConnection(server Server) (*grpc.ClientConn, error) {
 	cache.Lock()
 	defer cache.Unlock()

internal/testhelper/gitaly.go

@@ -11,6 +11,7 @@ import (
 
 	pb "gitlab.com/gitlab-org/gitaly-proto/go"
 
+	"golang.org/x/net/context"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 )
@@ -22,6 +23,7 @@ type GitalyTestServer struct {
 
 var (
 	GitalyInfoRefsResponseMock    = strings.Repeat("Mock Gitaly InfoRefsResponse data", 100000)
+	GitalyTreeEntryResponseMock   = strings.Repeat("Mock Gitaly TreeEntryResponse data", 100000)
 	GitalyReceivePackResponseMock []byte
 	GitalyUploadPackResponseMock  []byte
 )
@@ -167,6 +169,46 @@ func (s *GitalyTestServer) PostUploadPack(stream pb.SmartHTTP_PostUploadPackServ
 	return s.finalError()
 }
 
+func (s *GitalyTestServer) CommitIsAncestor(ctx context.Context, in *pb.CommitIsAncestorRequest) (*pb.CommitIsAncestorResponse, error) {
+	return nil, nil
+}
+
+func (s *GitalyTestServer) TreeEntry(in *pb.TreeEntryRequest, stream pb.Commit_TreeEntryServer) error {
+	s.WaitGroup.Add(1)
+	defer s.WaitGroup.Done()
+
+	if err := validateRepository(in.GetRepository()); err != nil {
+		return err
+	}
+
+	response := &pb.TreeEntryResponse{
+		Type: pb.TreeEntryResponse_BLOB,
+		Oid:  "deadfacedeadfacedeadfacedeadfacedeadface",
+		Size: int64(len(GitalyTreeEntryResponseMock)),
+		Mode: 0100644,
+	}
+	nSends, err := sendBytes([]byte(GitalyTreeEntryResponseMock), 100, func(p []byte) error {
+		response.Data = p
+
+		if err := stream.Send(response); err != nil {
+			return err
+		}
+
+		// Use a new response so we don't send other fields (Size, ...) over and over
+		response = &pb.TreeEntryResponse{}
+
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+	if nSends <= 1 {
+		panic("should have sent more than one message")
+	}
+
+	return s.finalError()
+}
+
 // sendBytes returns the number of times the 'sender' function was called and an error.
 func sendBytes(data []byte, chunkSize int, sender func([]byte) error) (int, error) {
 	i := 0