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Improve checkBranchName (#17901) 

The current implementation of checkBranchName is highly inefficient
involving opening the repository, the listing all of the branch names
checking them individually before then using using opened repo to get
the tags.

This PR avoids this by simply walking the references from show-ref
instead of opening the repository (in the nogogit case).

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2021-12-08 19:08:16 +00:00 committed by GitHub
parent b59875aa12
commit 9e6e1dc950
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 106 additions and 58 deletions
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4
modules/context/repo.go
View File

@ -584,7 +584,7 @@ func RepoAssignment(ctx *Context) (cancel context.CancelFunc) {
}
ctx.Data["Tags"] = tags
brs, _, err := ctx.Repo.GitRepo.GetBranches(0, 0)
brs, _, err := ctx.Repo.GitRepo.GetBranchNames(0, 0)
if err != nil {
ctx.ServerError("GetBranches", err)
return
@ -810,7 +810,7 @@ func RepoRefByType(refType RepoRefType, ignoreNotExistErr ...bool) func(*Context
if len(ctx.Params("*")) == 0 {
refName = ctx.Repo.Repository.DefaultBranch
if !ctx.Repo.GitRepo.IsBranchExist(refName) {
brs, _, err := ctx.Repo.GitRepo.GetBranches(0, 0)
brs, _, err := ctx.Repo.GitRepo.GetBranchNames(0, 0)
if err != nil {
ctx.ServerError("GetBranches", err)
return

11
modules/git/repo_branch.go
View File

@ -95,7 +95,12 @@ func GetBranchesByPath(path string, skip, limit int) ([]*Branch, int, error) {
}
defer gitRepo.Close()
brs, countAll, err := gitRepo.GetBranches(skip, limit)
return gitRepo.GetBranches(skip, limit)
}
// GetBranches returns a slice of *git.Branch
func (repo *Repository) GetBranches(skip, limit int) ([]*Branch, int, error) {
brs, countAll, err := repo.GetBranchNames(skip, limit)
if err != nil {
return nil, 0, err
}
@ -103,9 +108,9 @@ func GetBranchesByPath(path string, skip, limit int) ([]*Branch, int, error) {
branches := make([]*Branch, len(brs))
for i := range brs {
branches[i] = &Branch{
Path: path,
Path: repo.Path,
Name: brs[i],
gitRepo: gitRepo,
gitRepo: repo,
}
}

26
modules/git/repo_branch_gogit.go
View File

@ -9,6 +9,7 @@
package git
import (
"context"
"strings"
"github.com/go-git/go-git/v5/plumbing"
@ -52,7 +53,7 @@ func (repo *Repository) IsBranchExist(name string) bool {
// GetBranches returns branches from the repository, skipping skip initial branches and
// returning at most limit branches, or all branches if limit is 0.
func (repo *Repository) GetBranches(skip, limit int) ([]string, int, error) {
func (repo *Repository) GetBranchNames(skip, limit int) ([]string, int, error) {
var branchNames []string
branches, err := repo.gogitRepo.Branches()
@ -79,3 +80,26 @@ func (repo *Repository) GetBranches(skip, limit int) ([]string, int, error) {
return branchNames, count, nil
}
// WalkReferences walks all the references from the repository
func WalkReferences(ctx context.Context, repoPath string, walkfn func(string) error) (int, error) {
repo, err := OpenRepositoryCtx(ctx, repoPath)
if err != nil {
return 0, err
}
defer repo.Close()
i := 0
iter, err := repo.gogitRepo.References()
if err != nil {
return i, err
}
defer iter.Close()
err = iter.ForEach(func(ref *plumbing.Reference) error {
err := walkfn(string(ref.Name()))
i++
return err
})
return i, err
}

50
modules/git/repo_branch_nogogit.go
View File

@ -61,14 +61,29 @@ func (repo *Repository) IsBranchExist(name string) bool {
return repo.IsReferenceExist(BranchPrefix + name)
}
// GetBranches returns branches from the repository, skipping skip initial branches and
// GetBranchNames returns branches from the repository, skipping skip initial branches and
// returning at most limit branches, or all branches if limit is 0.
func (repo *Repository) GetBranches(skip, limit int) ([]string, int, error) {
func (repo *Repository) GetBranchNames(skip, limit int) ([]string, int, error) {
return callShowRef(repo.Ctx, repo.Path, BranchPrefix, "--heads", skip, limit)
}
// WalkReferences walks all the references from the repository
func WalkReferences(ctx context.Context, repoPath string, walkfn func(string) error) (int, error) {
return walkShowRef(ctx, repoPath, "", 0, 0, walkfn)
}
// callShowRef return refs, if limit = 0 it will not limit
func callShowRef(ctx context.Context, repoPath, prefix, arg string, skip, limit int) (branchNames []string, countAll int, err error) {
countAll, err = walkShowRef(ctx, repoPath, arg, skip, limit, func(branchName string) error {
branchName = strings.TrimPrefix(branchName, prefix)
branchNames = append(branchNames, branchName)
return nil
})
return
}
func walkShowRef(ctx context.Context, repoPath, arg string, skip, limit int, walkfn func(string) error) (countAll int, err error) {
stdoutReader, stdoutWriter := io.Pipe()
defer func() {
_ = stdoutReader.Close()
@ -77,7 +92,11 @@ func callShowRef(ctx context.Context, repoPath, prefix, arg string, skip, limit
go func() {
stderrBuilder := &strings.Builder{}
err := NewCommandContext(ctx, "show-ref", arg).RunInDirPipeline(repoPath, stdoutWriter, stderrBuilder)
args := []string{"show-ref"}
if arg != "" {
args = append(args, arg)
}
err := NewCommandContext(ctx, args...).RunInDirPipeline(repoPath, stdoutWriter, stderrBuilder)
if err != nil {
if stderrBuilder.Len() == 0 {
_ = stdoutWriter.Close()
@ -94,10 +113,10 @@ func callShowRef(ctx context.Context, repoPath, prefix, arg string, skip, limit
for i < skip {
_, isPrefix, err := bufReader.ReadLine()
if err == io.EOF {
return branchNames, i, nil
return i, nil
}
if err != nil {
return nil, 0, err
return 0, err
}
if !isPrefix {
i++
@ -112,39 +131,42 @@ func callShowRef(ctx context.Context, repoPath, prefix, arg string, skip, limit
_, err = bufReader.ReadSlice(' ')
}
if err == io.EOF {
return branchNames, i, nil
return i, nil
}
if err != nil {
return nil, 0, err
return 0, err
}
branchName, err := bufReader.ReadString('\n')
if err == io.EOF {
// This shouldn't happen... but we'll tolerate it for the sake of peace
return branchNames, i, nil
return i, nil
}
if err != nil {
return nil, i, err
return i, err
}
branchName = strings.TrimPrefix(branchName, prefix)
if len(branchName) > 0 {
branchName = branchName[:len(branchName)-1]
}
branchNames = append(branchNames, branchName)
err = walkfn(branchName)
if err != nil {
return i, err
}
i++
}
// count all refs
for limit != 0 {
_, isPrefix, err := bufReader.ReadLine()
if err == io.EOF {
return branchNames, i, nil
return i, nil
}
if err != nil {
return nil, 0, err
return 0, err
}
if !isPrefix {
i++
}
}
return branchNames, i, nil
return i, nil
}

8
modules/git/repo_branch_test.go
View File

@ -17,21 +17,21 @@ func TestRepository_GetBranches(t *testing.T) {
assert.NoError(t, err)
defer bareRepo1.Close()
branches, countAll, err := bareRepo1.GetBranches(0, 2)
branches, countAll, err := bareRepo1.GetBranchNames(0, 2)
assert.NoError(t, err)
assert.Len(t, branches, 2)
assert.EqualValues(t, 3, countAll)
assert.ElementsMatch(t, []string{"branch1", "branch2"}, branches)
branches, countAll, err = bareRepo1.GetBranches(0, 0)
branches, countAll, err = bareRepo1.GetBranchNames(0, 0)
assert.NoError(t, err)
assert.Len(t, branches, 3)
assert.EqualValues(t, 3, countAll)
assert.ElementsMatch(t, []string{"branch1", "branch2", "master"}, branches)
branches, countAll, err = bareRepo1.GetBranches(5, 1)
branches, countAll, err = bareRepo1.GetBranchNames(5, 1)
assert.NoError(t, err)
assert.Len(t, branches, 0)
@ -48,7 +48,7 @@ func BenchmarkRepository_GetBranches(b *testing.B) {
defer bareRepo1.Close()
for i := 0; i < b.N; i++ {
_, _, err := bareRepo1.GetBranches(0, 0)
_, _, err := bareRepo1.GetBranchNames(0, 0)
if err != nil {
b.Fatal(err)
}

4
routers/web/repo/branch.go
View File

@ -165,14 +165,14 @@ func redirect(ctx *context.Context) {
// loadBranches loads branches from the repository limited by page & pageSize.
// NOTE: May write to context on error.
func loadBranches(ctx *context.Context, skip, limit int) ([]*Branch, int) {
defaultBranch, err := repo_service.GetBranch(ctx.Repo.Repository, ctx.Repo.Repository.DefaultBranch)
defaultBranch, err := ctx.Repo.GitRepo.GetBranch(ctx.Repo.Repository.DefaultBranch)
if err != nil {
log.Error("loadBranches: get default branch: %v", err)
ctx.ServerError("GetDefaultBranch", err)
return nil, 0
}
rawBranches, totalNumOfBranches, err := repo_service.GetBranches(ctx.Repo.Repository, skip, limit)
rawBranches, totalNumOfBranches, err := ctx.Repo.GitRepo.GetBranches(skip, limit)
if err != nil {
log.Error("GetBranches: %v", err)
ctx.ServerError("GetBranches", err)

4
routers/web/repo/compare.go
View File

@ -660,7 +660,7 @@ func getBranchesAndTagsForRepo(repo *models.Repository) (branches, tags []string
}
defer gitRepo.Close()
branches, _, err = gitRepo.GetBranches(0, 0)
branches, _, err = gitRepo.GetBranchNames(0, 0)
if err != nil {
return nil, nil, err
}
@ -711,7 +711,7 @@ func CompareDiff(ctx *context.Context) {
return
}
headBranches, _, err := ci.HeadGitRepo.GetBranches(0, 0)
headBranches, _, err := ci.HeadGitRepo.GetBranchNames(0, 0)
if err != nil {
ctx.ServerError("GetBranches", err)
return

2
routers/web/repo/issue.go
View File

@ -690,7 +690,7 @@ func RetrieveRepoMetas(ctx *context.Context, repo *models.Repository, isPull boo
return nil
}
brs, _, err := ctx.Repo.GitRepo.GetBranches(0, 0)
brs, _, err := ctx.Repo.GitRepo.GetBranchNames(0, 0)
if err != nil {
ctx.ServerError("GetBranches", err)
return nil

2
services/repository/adopt.go
View File

@ -142,7 +142,7 @@ func adoptRepository(ctx context.Context, repoPath string, u *user_model.User, r
repo.DefaultBranch = strings.TrimPrefix(repo.DefaultBranch, git.BranchPrefix)
}
branches, _, _ := gitRepo.GetBranches(0, 0)
branches, _, _ := gitRepo.GetBranchNames(0, 0)
found := false
hasDefault := false
hasMaster := false

53
services/repository/branch.go
View File

@ -5,8 +5,10 @@
package repository
import (
"context"
"errors"
"fmt"
"strings"
"code.gitea.io/gitea/models"
user_model "code.gitea.io/gitea/models/user"
@ -20,7 +22,7 @@ import (
// CreateNewBranch creates a new repository branch
func CreateNewBranch(doer *user_model.User, repo *models.Repository, oldBranchName, branchName string) (err error) {
// Check if branch name can be used
if err := checkBranchName(repo, branchName); err != nil {
if err := checkBranchName(git.DefaultContext, repo, branchName); err != nil {
return err
}
@ -65,44 +67,39 @@ func GetBranches(repo *models.Repository, skip, limit int) ([]*git.Branch, int,
}
// checkBranchName validates branch name with existing repository branches
func checkBranchName(repo *models.Repository, name string) error {
gitRepo, err := git.OpenRepository(repo.RepoPath())
if err != nil {
return err
}
defer gitRepo.Close()
branches, _, err := GetBranches(repo, 0, 0)
if err != nil {
return err
}
for _, branch := range branches {
if branch.Name == name {
func checkBranchName(ctx context.Context, repo *models.Repository, name string) error {
_, err := git.WalkReferences(ctx, repo.RepoPath(), func(refName string) error {
branchRefName := strings.TrimPrefix(refName, git.BranchPrefix)
switch {
case branchRefName == name:
return models.ErrBranchAlreadyExists{
BranchName: branch.Name,
BranchName: name,
}
} else if (len(branch.Name) < len(name) && branch.Name+"/" == name[0:len(branch.Name)+1]) ||
(len(branch.Name) > len(name) && name+"/" == branch.Name[0:len(name)+1]) {
// If branchRefName like a/b but we want to create a branch named a then we have a conflict
case strings.HasPrefix(branchRefName, name+"/"):
return models.ErrBranchNameConflict{
BranchName: branch.Name,
BranchName: branchRefName,
}
// Conversely if branchRefName like a but we want to create a branch named a/b then we also have a conflict
case strings.HasPrefix(name, branchRefName+"/"):
return models.ErrBranchNameConflict{
BranchName: branchRefName,
}
case refName == git.TagPrefix+name:
return models.ErrTagAlreadyExists{
TagName: name,
}
}
}
return nil
})
if _, err := gitRepo.GetTag(name); err == nil {
return models.ErrTagAlreadyExists{
TagName: name,
}
}
return nil
return err
}
// CreateNewBranchFromCommit creates a new repository branch
func CreateNewBranchFromCommit(doer *user_model.User, repo *models.Repository, commit, branchName string) (err error) {
// Check if branch name can be used
if err := checkBranchName(repo, branchName); err != nil {
if err := checkBranchName(git.DefaultContext, repo, branchName); err != nil {
return err
}