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package commit
import (
"context"
"errors"
"fmt"
"io/ioutil"
"strconv"
"strings"
"gitlab.com/gitlab-org/gitaly/internal/helper"
"gitlab.com/gitlab-org/gitaly/internal/git"
"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
)
// CountDivergingCommits counts the diverging commits between from and to. Important to note that when --max-count is applied, the counts are not guaranteed to be
// accurate because --max-count is applied before it does the rev walk.
func (s *server) CountDivergingCommits(ctx context.Context, req *gitalypb.CountDivergingCommitsRequest) (*gitalypb.CountDivergingCommitsResponse, error) {
if err := validateCountDivergingCommitsRequest(req); err != nil {
return nil, helper.ErrInvalidArgument(err)
}
from, to := string(req.GetFrom()), string(req.GetTo())
maxCount := int(req.GetMaxCount())
left, right, err := findLeftRightCount(ctx, req.GetRepository(), from, to, maxCount)
if err != nil {
return nil, helper.ErrInternal(err)
}
return &gitalypb.CountDivergingCommitsResponse{LeftCount: left, RightCount: right}, nil
}
func validateCountDivergingCommitsRequest(req *gitalypb.CountDivergingCommitsRequest) error {
if req.GetFrom() == nil || req.GetTo() == nil {
return errors.New("from and to are both required")
}
if req.GetRepository() == nil {
return errors.New("repository is empty")
}
if _, err := helper.GetRepoPath(req.GetRepository()); err != nil {
return fmt.Errorf("repository not valid: %v", err)
}
return nil
}
func buildRevListCountArgs(from, to string, maxCount int) []string {
cmdArgs := []string{"rev-list", "--count", "--left-right"}
if maxCount != 0 {
cmdArgs = append(cmdArgs, fmt.Sprintf("--max-count=%d", maxCount))
}
return append(cmdArgs, fmt.Sprintf("%s...%s", from, to))
}
func findLeftRightCount(ctx context.Context, repo *gitalypb.Repository, from, to string, maxCount int) (int32, int32, error) {
cmdArgs := buildRevListCountArgs(from, to, maxCount)
cmd, err := git.Command(ctx, repo, cmdArgs...)
if err != nil {
return 0, 0, fmt.Errorf("git rev-list cmd: %v", err)
}
var leftCount, rightCount int64
countStr, err := ioutil.ReadAll(cmd)
if err != nil {
return 0, 0, fmt.Errorf("git rev-list error: %v", err)
}
if err := cmd.Wait(); err != nil {
return 0, 0, fmt.Errorf("gi rev-list error: %v", err)
}
counts := strings.Fields(string(countStr))
if len(counts) != 2 {
return 0, 0, fmt.Errorf("invalid output from git rev-list --left-right: %v", string(countStr))
}
leftCount, err = strconv.ParseInt(string(counts[0]), 10, 32)
if err != nil {
return 0, 0, fmt.Errorf("invalid left count value: %v", counts[0])
}
rightCount, err = strconv.ParseInt(string(counts[1]), 10, 32)
if err != nil {
return 0, 0, fmt.Errorf("invalid right count value: %v", counts[1])
}
return int32(leftCount), int32(rightCount), nil
}
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