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package ref
import (
"bytes"
"context"
"fmt"
"math"
"gitlab.com/gitlab-org/gitaly/v16/internal/git"
"gitlab.com/gitlab-org/gitaly/v16/internal/git/catfile"
"gitlab.com/gitlab-org/gitaly/v16/internal/helper/lines"
"gitlab.com/gitlab-org/gitaly/v16/proto/go/gitalypb"
)
var localBranchFormatFields = []string{"%(refname)", "%(objectname)"}
func parseRef(ref []byte, length int) ([][]byte, error) {
elements := bytes.Split(ref, []byte("\x00"))
if len(elements) != length {
return nil, fmt.Errorf("error parsing ref %q", ref)
}
return elements, nil
}
func buildAllBranchesBranch(ctx context.Context, objectReader catfile.ObjectContentReader, elements [][]byte) (*gitalypb.FindAllBranchesResponse_Branch, error) {
target, err := catfile.GetCommit(ctx, objectReader, git.Revision(elements[1]))
if err != nil {
return nil, err
}
return &gitalypb.FindAllBranchesResponse_Branch{
Name: elements[0],
Target: target,
}, nil
}
func buildBranch(ctx context.Context, objectReader catfile.ObjectContentReader, elements [][]byte) (*gitalypb.Branch, error) {
target, err := catfile.GetCommit(ctx, objectReader, git.Revision(elements[1]))
if err != nil {
return nil, err
}
return &gitalypb.Branch{
Name: elements[0],
TargetCommit: target,
}, nil
}
func newFindLocalBranchesWriter(stream gitalypb.RefService_FindLocalBranchesServer, objectReader catfile.ObjectContentReader) lines.Sender {
return func(refs [][]byte) error {
ctx := stream.Context()
var response *gitalypb.FindLocalBranchesResponse
var branches []*gitalypb.Branch
for _, ref := range refs {
elements, err := parseRef(ref, len(localBranchFormatFields))
if err != nil {
return err
}
branch, err := buildBranch(ctx, objectReader, elements)
if err != nil {
return err
}
branches = append(branches, branch)
}
response = &gitalypb.FindLocalBranchesResponse{LocalBranches: branches}
return stream.Send(response)
}
}
func newFindAllBranchesWriter(stream gitalypb.RefService_FindAllBranchesServer, objectReader catfile.ObjectContentReader) lines.Sender {
return func(refs [][]byte) error {
var branches []*gitalypb.FindAllBranchesResponse_Branch
ctx := stream.Context()
for _, ref := range refs {
elements, err := parseRef(ref, len(localBranchFormatFields))
if err != nil {
return err
}
branch, err := buildAllBranchesBranch(ctx, objectReader, elements)
if err != nil {
return err
}
branches = append(branches, branch)
}
return stream.Send(&gitalypb.FindAllBranchesResponse{Branches: branches})
}
}
func newFindAllRemoteBranchesWriter(stream gitalypb.RefService_FindAllRemoteBranchesServer, objectReader catfile.ObjectContentReader) lines.Sender {
return func(refs [][]byte) error {
var branches []*gitalypb.Branch
ctx := stream.Context()
for _, ref := range refs {
elements, err := parseRef(ref, len(localBranchFormatFields))
if err != nil {
return err
}
branch, err := buildBranch(ctx, objectReader, elements)
if err != nil {
return err
}
branches = append(branches, branch)
}
return stream.Send(&gitalypb.FindAllRemoteBranchesResponse{Branches: branches})
}
}
type findRefsOpts struct {
cmdArgs []git.Option
delim byte
lines.SenderOpts
}
func (s *server) findRefs(ctx context.Context, writer lines.Sender, repo git.RepositoryExecutor, patterns []string, opts *findRefsOpts) error {
var options []git.Option
if len(opts.cmdArgs) == 0 {
options = append(options, git.Flag{Name: "--format=%(refname)"}) // Default format
} else {
options = append(options, opts.cmdArgs...)
}
cmd, err := repo.Exec(ctx, git.Command{
Name: "for-each-ref",
Flags: options,
Args: patterns,
}, git.WithSetupStdout())
if err != nil {
return err
}
if err := lines.Send(cmd, writer, lines.SenderOpts{
IsPageToken: opts.IsPageToken,
Delimiter: opts.delim,
Limit: opts.Limit,
PageTokenError: opts.PageTokenError,
}); err != nil {
return err
}
return cmd.Wait()
}
type paginationOpts struct {
// Limit allows to set the maximum numbers of elements
Limit int
// IsPageToken allows control over which results are sent as part of the
// response. When IsPageToken evaluates to true for the first time,
// results will start to be sent as part of the response. This function
// will be called with an empty slice previous to sending the first line
// in order to allow sending everything right from the beginning.
IsPageToken func([]byte) bool
// When PageTokenError is true then the response will return an error when
// PageToken is not found.
PageTokenError bool
}
func buildPaginationOpts(ctx context.Context, p *gitalypb.PaginationParameter) *paginationOpts {
opts := &paginationOpts{}
opts.IsPageToken = func(_ []byte) bool { return true }
opts.Limit = math.MaxInt32
if p == nil {
return opts
}
if p.GetLimit() >= 0 {
opts.Limit = int(p.GetLimit())
}
if p.GetPageToken() != "" {
opts.IsPageToken = func(line []byte) bool {
// Only use the first part of the line before \x00 separator
if nullByteIndex := bytes.IndexByte(line, 0); nullByteIndex != -1 {
line = line[:nullByteIndex]
}
return bytes.Equal(line, []byte(p.GetPageToken()))
}
opts.PageTokenError = true
}
return opts
}
func buildFindRefsOpts(ctx context.Context, p *gitalypb.PaginationParameter) *findRefsOpts {
opts := buildPaginationOpts(ctx, p)
refsOpts := &findRefsOpts{delim: '\n'}
refsOpts.Limit = opts.Limit
refsOpts.IsPageToken = opts.IsPageToken
refsOpts.PageTokenError = opts.PageTokenError
return refsOpts
}
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