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package repository
import (
"context"
"errors"
"io/ioutil"
"os/exec"
"github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/gitaly/internal/git"
"gitlab.com/gitlab-org/gitaly/internal/helper"
"gitlab.com/gitlab-org/gitaly/internal/helper/text"
"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
"google.golang.org/grpc/metadata"
)
type writeRefRequest interface {
GetRef() []byte
GetRevision() []byte
GetOldRevision() []byte
GetRepository() *gitalypb.Repository
}
func (s *server) WriteRefTx(ctx context.Context, req *gitalypb.WriteRefTxRequest) (*gitalypb.WriteRefTxResponse, error) {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, helper.ErrInternal(errors.New("could not get metadata from context"))
}
transactionSteps := md.Get("transaction_step")
logrus.WithField("transaction_steps", transactionSteps).Info("got transaction steps")
if len(transactionSteps) == 0 {
return nil, nil
}
logrus.WithField("transaction_steps", transactionSteps).Info("got transaction steps")
transactionStep := transactionSteps[len(transactionSteps)-1]
if transactionStep == "precommit" {
logrus.WithField("relative_path", req.GetRepository().GetRelativePath()).WithField("ref", string(req.GetRef())).WithField("rev", string(req.GetRevision())).WithField("old_rev", string(req.GetOldRevision())).Info("WriteRefReqTx")
if err := validateWriteRefRequest(req); err != nil {
return nil, helper.ErrInvalidArgument(err)
}
}
return s.transactionalWriteRef(ctx, req, transactionStep)
}
func (s *server) transactionalWriteRef(ctx context.Context, req *gitalypb.WriteRefTxRequest, transactionStep string) (*gitalypb.WriteRefTxResponse, error) {
var resp gitalypb.WriteRefTxResponse
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, helper.ErrInternal(errors.New("couldn't get metadata"))
}
if len(md.Get("transaction_id")) == 0 {
return nil, helper.ErrInternal(errors.New("expected request_id"))
}
transactionID := md.Get("transaction_id")[0]
switch transactionStep {
case "vote":
logrus.WithField("transaction_step", "vote").Info("transaction!")
s.transactions.Begin(transactionID)
err := vote(ctx, req)
if err != nil {
return nil, err
}
case "precommit":
logrus.WithField("transaction_step", "precommit").Info("transaction!")
rollback, err := rollbackRef(req)
if err != nil {
return nil, err
}
commit, err := preCommit(req)
if err != nil {
return nil, err
}
s.transactions.SetRollback(transactionID, rollback)
s.transactions.PreCommit(transactionID, commit)
case "commit":
logrus.WithField("transaction_step", "commit").Info("transaction!")
if err := s.transactions.Commit(transactionID); err != nil {
return nil, err
}
case "rollback":
logrus.WithField("transaction_step", "rollback").Info("transaction!")
if err := s.transactions.Rollback(transactionID); err != nil {
return nil, err
}
default:
return nil, errors.New("unknown transaction step")
}
return &resp, nil
}
func vote(ctx context.Context, req *gitalypb.WriteRefTxRequest) error {
if req.GetOldRevision() == nil {
return nil
}
cmd, err := git.SafeCmd(ctx, req.GetRepository(), nil, git.SubCmd{
Name: "rev-parse",
Args: []string{string(req.GetRef())},
})
if err != nil {
return err
}
if err := cmd.Wait(); err != nil {
return err
}
rev, err := ioutil.ReadAll(cmd)
if err != nil {
return err
}
if text.ChompBytes(rev) != string(req.GetOldRevision()) {
return errors.New("not ready")
}
return nil
}
func rollbackSymbolicRef(req *gitalypb.WriteRefTxRequest) (*exec.Cmd, error) {
repoPath, err := helper.GetRepoPath(req.GetRepository())
if err != nil {
return nil, err
}
return exec.Command("git", "-C", repoPath, "symoblic-ref", string(req.GetRef()), string(req.GetOldRevision())), nil
}
func rollbackRef(req *gitalypb.WriteRefTxRequest) (*exec.Cmd, error) {
if string(req.Ref) == "HEAD" {
return rollbackSymbolicRef(req)
}
repoPath, err := helper.GetRepoPath(req.GetRepository())
if err != nil {
return nil, err
}
args := []string{"-C", repoPath, "update-ref"}
if req.GetOldRevision() == nil {
args = append(args, "-d", string(req.GetRevision()))
} else {
args = append(args, string(req.GetOldRevision()), string(req.GetRevision()))
}
c := exec.Command("git", args...)
return c, nil
}
func preCommit(req *gitalypb.WriteRefTxRequest) (*exec.Cmd, error) {
if string(req.Ref) == "HEAD" {
return preCommitSymbolicRef(req)
}
repoPath, err := helper.GetRepoPath(req.GetRepository())
if err != nil {
return nil, err
}
args := []string{"-C", repoPath, "update-ref", string(req.GetRef()), string(req.GetRevision())}
if req.GetOldRevision() != nil {
args = append(args, string(req.GetOldRevision()))
}
c := exec.Command("git", args...)
logrus.WithField("DA COMMAND ARGS!!!", args).Info("1234567")
return c, nil
}
func preCommitSymbolicRef(req *gitalypb.WriteRefTxRequest) (*exec.Cmd, error) {
repoPath, err := helper.GetRepoPath(req.GetRepository())
if err != nil {
return nil, err
}
return exec.Command("git", "-C", repoPath, "symoblic-ref", string(req.GetRef()), string(req.GetRevision())), nil
}
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