Merge branch 'zj-pagination-commits-between' into 'master'

CommitsBetween: learn to accept pagination params

See merge request gitlab-org/gitaly!2484

6 files changed, 226 insertions, 158 deletions

diff --git a/changelogs/unreleased/zj-pagination-commits-between.yml b/changelogs/unreleased/zj-pagination-commits-between.yml
new file mode 100644
index 000000000..9417294ce
--- /dev/null
+++ b/changelogs/unreleased/zj-pagination-commits-between.yml
@@ -0,0 +1,5 @@
+---
+title: 'CommitsBetween: learn to accept pagination params'
+merge_request: 2484
+author:
+type: changed
diff --git a/internal/gitaly/service/commit/between.go b/internal/gitaly/service/commit/between.go
index 075a44e03..e0d82c6f7 100644
--- a/internal/gitaly/service/commit/between.go
+++ b/internal/gitaly/service/commit/between.go
@@ -2,6 +2,7 @@ package commit
 
 import (
 	"fmt"
+	"strconv"
 
 	"github.com/golang/protobuf/proto"
 	"gitlab.com/gitlab-org/gitaly/internal/git"
@@ -29,15 +30,44 @@ func (s *server) CommitsBetween(in *gitalypb.CommitsBetweenRequest, stream gital
 	}
 
 	sender := &commitsBetweenSender{stream: stream}
-	revisionRange := fmt.Sprintf("%s..%s", in.GetFrom(), in.GetTo())
 
-	if err := sendCommits(stream.Context(), sender, s.gitCmdFactory, in.GetRepository(), []string{revisionRange}, nil, nil, git.Flag{Name: "--reverse"}); err != nil {
+	from, to, limit := normalizedCommitsBetweenParams(in)
+	revisionRange := fmt.Sprintf("%s..%s", from, to)
+
+	if err := sendCommits(
+		stream.Context(),
+		sender,
+		s.gitCmdFactory,
+		in.GetRepository(),
+		[]string{revisionRange},
+		nil,
+		nil,
+		git.Flag{Name: "--reverse"},
+		git.ValueFlag{Name: "--max-count", Value: strconv.Itoa(int(limit))},
+	); err != nil {
 		return helper.ErrInternal(err)
 	}
 
 	return nil
 }
 
+// returns the from, to, and limit CLI parameters abiding by pagination params
+func normalizedCommitsBetweenParams(req *gitalypb.CommitsBetweenRequest) (string, string, int32) {
+	from := string(req.GetFrom())
+	to := string(req.GetTo())
+	var limit int32 = 2147483647
+
+	if req.PaginationParams != nil {
+		from = req.PaginationParams.GetPageToken() + "~"
+
+		if req.PaginationParams.GetLimit() > 0 {
+			limit = req.PaginationParams.GetLimit()
+		}
+	}
+
+	return from, to, limit
+}
+
 func validateCommitsBetween(in *gitalypb.CommitsBetweenRequest) error {
 	if err := git.ValidateRevision(in.GetFrom()); err != nil {
 		return fmt.Errorf("from: %v", err)
diff --git a/internal/gitaly/service/commit/between_test.go b/internal/gitaly/service/commit/between_test.go
index bb35bd010..68faf59d9 100644
--- a/internal/gitaly/service/commit/between_test.go
+++ b/internal/gitaly/service/commit/between_test.go
@@ -23,10 +23,11 @@ func TestSuccessfulCommitsBetween(t *testing.T) {
 		testhelper.GitLabTestCommit("ba3343bc4fa403a8dfbfcab7fc1a8c29ee34bd69"),
 	}
 	testCases := []struct {
-		description     string
-		from            []byte
-		to              []byte
-		expectedCommits []*gitalypb.GitCommit
+		description      string
+		from             []byte
+		to               []byte
+		paginationParams *gitalypb.PaginationParameter
+		expectedCommits  []*gitalypb.GitCommit
 	}{
 		{
 			description:     "From hash to hash",
@@ -38,7 +39,7 @@ func TestSuccessfulCommitsBetween(t *testing.T) {
 			description:     "From hash to ref",
 			from:            from,
 			to:              []byte("gitaly-test-ref"),
-			expectedCommits: expectedCommits,
+			expectedCommits: expectedCommits[:3],
 		},
 		{
 			description:     "From ref to hash",
@@ -50,7 +51,7 @@ func TestSuccessfulCommitsBetween(t *testing.T) {
 			description:     "From ref to ref",
 			from:            []byte("branch-merged"),
 			to:              []byte("gitaly-test-ref"),
-			expectedCommits: expectedCommits,
+			expectedCommits: expectedCommits[:3],
 		},
 		{
 			description:     "To hash doesn't exist",
@@ -76,11 +77,21 @@ func TestSuccessfulCommitsBetween(t *testing.T) {
 			to:              to,
 			expectedCommits: []*gitalypb.GitCommit{},
 		},
+		{
+			description: "using pagination to limit and offset results",
+			from:        from,
+			to:          to,
+			paginationParams: &gitalypb.PaginationParameter{
+				Limit:     3,
+				PageToken: "b83d6e391c22777fca1ed3012fce84f633d7fed0",
+			},
+			expectedCommits: expectedCommits[1:4],
+		},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.description, func(t *testing.T) {
 			rpcRequest := gitalypb.CommitsBetweenRequest{
-				Repository: repo, From: tc.from, To: tc.to,
+				Repository: repo, From: tc.from, To: tc.to, PaginationParams: tc.paginationParams,
 			}
 
 			ctx, cancel := testhelper.Context()
@@ -91,8 +102,9 @@ func TestSuccessfulCommitsBetween(t *testing.T) {
 
 			commits := getAllCommits(t, func() (gitCommitsGetter, error) { return c.Recv() })
 
+			require.Len(t, commits, len(tc.expectedCommits))
 			for i, commit := range commits {
-				testhelper.ProtoEqual(t, expectedCommits[i], commit)
+				testhelper.ProtoEqual(t, tc.expectedCommits[i], commit)
 			}
 		})
 	}
diff --git a/proto/commit.proto b/proto/commit.proto
index bc52ab834..909207721 100644
--- a/proto/commit.proto
+++ b/proto/commit.proto
@@ -176,6 +176,12 @@ message CommitsBetweenRequest {
   Repository repository = 1 [(target_repository)=true];
   bytes from = 2;
   bytes to = 3;
+
+  // The page token is the last commit OID that was sent. It's expected to be the
+  // full object ID to guard against ambigious OIDs. Using the page parameter is
+  // effectivaly equivalent to setting the `from` parameter to the commit object
+  // identifier.
+  PaginationParameter pagination_params = 4;
 }
 
 message CommitsBetweenResponse {
diff --git a/proto/go/gitalypb/commit.pb.go b/proto/go/gitalypb/commit.pb.go
index 84fd6b950..ba69d60a9 100644
--- a/proto/go/gitalypb/commit.pb.go
+++ b/proto/go/gitalypb/commit.pb.go
@@ -488,12 +488,17 @@ func (m *TreeEntryResponse) GetData() []byte {
 }
 
 type CommitsBetweenRequest struct {
-	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
-	From                 []byte      `protobuf:"bytes,2,opt,name=from,proto3" json:"from,omitempty"`
-	To                   []byte      `protobuf:"bytes,3,opt,name=to,proto3" json:"to,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
-	XXX_unrecognized     []byte      `json:"-"`
-	XXX_sizecache        int32       `json:"-"`
+	Repository *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
+	From       []byte      `protobuf:"bytes,2,opt,name=from,proto3" json:"from,omitempty"`
+	To         []byte      `protobuf:"bytes,3,opt,name=to,proto3" json:"to,omitempty"`
+	// The page token is the last commit OID that was sent. It's expected to be the
+	// full object ID to guard against ambigious OIDs. Using the page parameter is
+	// effectivaly equivalent to setting the `from` parameter to the commit object
+	// identifier.
+	PaginationParams     *PaginationParameter `protobuf:"bytes,4,opt,name=pagination_params,json=paginationParams,proto3" json:"pagination_params,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}             `json:"-"`
+	XXX_unrecognized     []byte               `json:"-"`
+	XXX_sizecache        int32                `json:"-"`
 }
 
 func (m *CommitsBetweenRequest) Reset()         { *m = CommitsBetweenRequest{} }
@@ -542,6 +547,13 @@ func (m *CommitsBetweenRequest) GetTo() []byte {
 	return nil
 }
 
+func (m *CommitsBetweenRequest) GetPaginationParams() *PaginationParameter {
+	if m != nil {
+		return m.PaginationParams
+	}
+	return nil
+}
+
 type CommitsBetweenResponse struct {
 	Commits              []*GitCommit `protobuf:"bytes,1,rep,name=commits,proto3" json:"commits,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
@@ -2853,148 +2865,150 @@ func init() {
 func init() { proto.RegisterFile("commit.proto", fileDescriptor_db7163399a465f48) }
 
 var fileDescriptor_db7163399a465f48 = []byte{
-	// 2246 bytes of a gzipped FileDescriptorProto
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/ruby/proto/gitaly/commit_pb.rb b/ruby/proto/gitaly/commit_pb.rb
index b9d7783fe..63251e66e 100644
--- a/ruby/proto/gitaly/commit_pb.rb
+++ b/ruby/proto/gitaly/commit_pb.rb
@@ -49,6 +49,7 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
       optional :repository, :message, 1, "gitaly.Repository"
       optional :from, :bytes, 2
       optional :to, :bytes, 3
+      optional :pagination_params, :message, 4, "gitaly.PaginationParameter"
     end
     add_message "gitaly.CommitsBetweenResponse" do
       repeated :commits, :message, 1, "gitaly.GitCommit"