forgejo-federation/models/repo_indexer.go
2018-02-10 20:19:26 +02:00

349 lines
9.4 KiB
Go

// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package models
import (
"fmt"
"strconv"
"strings"
"code.gitea.io/git"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/indexer"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"github.com/ethantkoenig/rupture"
)
// RepoIndexerStatus status of a repo's entry in the repo indexer
// For now, implicitly refers to default branch
type RepoIndexerStatus struct {
ID int64 `xorm:"pk autoincr"`
RepoID int64 `xorm:"INDEX"`
CommitSha string `xorm:"VARCHAR(40)"`
}
func (repo *Repository) getIndexerStatus() error {
if repo.IndexerStatus != nil {
return nil
}
status := &RepoIndexerStatus{RepoID: repo.ID}
has, err := x.Get(status)
if err != nil {
return err
} else if !has {
status.CommitSha = ""
}
repo.IndexerStatus = status
return nil
}
func (repo *Repository) updateIndexerStatus(sha string) error {
if err := repo.getIndexerStatus(); err != nil {
return err
}
if len(repo.IndexerStatus.CommitSha) == 0 {
repo.IndexerStatus.CommitSha = sha
_, err := x.Insert(repo.IndexerStatus)
return err
}
repo.IndexerStatus.CommitSha = sha
_, err := x.ID(repo.IndexerStatus.ID).Cols("commit_sha").
Update(repo.IndexerStatus)
return err
}
type repoIndexerOperation struct {
repo *Repository
deleted bool
}
var repoIndexerOperationQueue chan repoIndexerOperation
// InitRepoIndexer initialize the repo indexer
func InitRepoIndexer() {
if !setting.Indexer.RepoIndexerEnabled {
return
}
repoIndexerOperationQueue = make(chan repoIndexerOperation, setting.Indexer.UpdateQueueLength)
indexer.InitRepoIndexer(populateRepoIndexerAsynchronously)
go processRepoIndexerOperationQueue()
}
// populateRepoIndexerAsynchronously asynchronously populates the repo indexer
// with pre-existing data. This should only be run when the indexer is created
// for the first time.
func populateRepoIndexerAsynchronously() error {
exist, err := x.Table("repository").Exist()
if err != nil {
return err
} else if !exist {
return nil
}
// if there is any existing repo indexer metadata in the DB, delete it
// since we are starting afresh. Also, xorm requires deletes to have a
// condition, and we want to delete everything, thus 1=1.
if _, err := x.Where("1=1").Delete(new(RepoIndexerStatus)); err != nil {
return err
}
var maxRepoID int64
if _, err = x.Select("MAX(id)").Table("repository").Get(&maxRepoID); err != nil {
return err
}
go populateRepoIndexer(maxRepoID)
return nil
}
// populateRepoIndexer populate the repo indexer with pre-existing data. This
// should only be run when the indexer is created for the first time.
func populateRepoIndexer(maxRepoID int64) {
log.Info("Populating the repo indexer with existing repositories")
// start with the maximum existing repo ID and work backwards, so that we
// don't include repos that are created after gitea starts; such repos will
// already be added to the indexer, and we don't need to add them again.
for maxRepoID > 0 {
repos := make([]*Repository, 0, RepositoryListDefaultPageSize)
err := x.Where("id <= ?", maxRepoID).
OrderBy("id DESC").
Limit(RepositoryListDefaultPageSize).
Find(&repos)
if err != nil {
log.Error(4, "populateRepoIndexer: %v", err)
return
} else if len(repos) == 0 {
break
}
for _, repo := range repos {
repoIndexerOperationQueue <- repoIndexerOperation{
repo: repo,
deleted: false,
}
maxRepoID = repo.ID - 1
}
}
log.Info("Done populating the repo indexer with existing repositories")
}
func updateRepoIndexer(repo *Repository) error {
sha, err := getDefaultBranchSha(repo)
if err != nil {
return err
}
changes, err := getRepoChanges(repo, sha)
if err != nil {
return err
} else if changes == nil {
return nil
}
batch := indexer.RepoIndexerBatch()
for _, update := range changes.Updates {
if err := addUpdate(update, repo, batch); err != nil {
return err
}
}
for _, filename := range changes.RemovedFilenames {
if err := addDelete(filename, repo, batch); err != nil {
return err
}
}
if err = batch.Flush(); err != nil {
return err
}
return repo.updateIndexerStatus(sha)
}
// repoChanges changes (file additions/updates/removals) to a repo
type repoChanges struct {
Updates []fileUpdate
RemovedFilenames []string
}
type fileUpdate struct {
Filename string
BlobSha string
}
func getDefaultBranchSha(repo *Repository) (string, error) {
stdout, err := git.NewCommand("show-ref", "-s", repo.DefaultBranch).RunInDir(repo.RepoPath())
if err != nil {
return "", err
}
return strings.TrimSpace(stdout), nil
}
// getRepoChanges returns changes to repo since last indexer update
func getRepoChanges(repo *Repository, revision string) (*repoChanges, error) {
if err := repo.getIndexerStatus(); err != nil {
return nil, err
}
if len(repo.IndexerStatus.CommitSha) == 0 {
return genesisChanges(repo, revision)
}
return nonGenesisChanges(repo, revision)
}
func addUpdate(update fileUpdate, repo *Repository, batch rupture.FlushingBatch) error {
stdout, err := git.NewCommand("cat-file", "-s", update.BlobSha).
RunInDir(repo.RepoPath())
if err != nil {
return err
}
if size, err := strconv.Atoi(strings.TrimSpace(stdout)); err != nil {
return fmt.Errorf("Misformatted git cat-file output: %v", err)
} else if int64(size) > setting.Indexer.MaxIndexerFileSize {
return nil
}
fileContents, err := git.NewCommand("cat-file", "blob", update.BlobSha).
RunInDirBytes(repo.RepoPath())
if err != nil {
return err
} else if !base.IsTextFile(fileContents) {
return nil
}
indexerUpdate := indexer.RepoIndexerUpdate{
Filepath: update.Filename,
Op: indexer.RepoIndexerOpUpdate,
Data: &indexer.RepoIndexerData{
RepoID: repo.ID,
Content: string(fileContents),
},
}
return indexerUpdate.AddToFlushingBatch(batch)
}
func addDelete(filename string, repo *Repository, batch rupture.FlushingBatch) error {
indexerUpdate := indexer.RepoIndexerUpdate{
Filepath: filename,
Op: indexer.RepoIndexerOpDelete,
Data: &indexer.RepoIndexerData{
RepoID: repo.ID,
},
}
return indexerUpdate.AddToFlushingBatch(batch)
}
// parseGitLsTreeOutput parses the output of a `git ls-tree -r --full-name` command
func parseGitLsTreeOutput(stdout []byte) ([]fileUpdate, error) {
entries, err := git.ParseTreeEntries(stdout)
if err != nil {
return nil, err
}
updates := make([]fileUpdate, len(entries))
for i, entry := range entries {
updates[i] = fileUpdate{
Filename: entry.Name(),
BlobSha: entry.ID.String(),
}
}
return updates, nil
}
// genesisChanges get changes to add repo to the indexer for the first time
func genesisChanges(repo *Repository, revision string) (*repoChanges, error) {
var changes repoChanges
stdout, err := git.NewCommand("ls-tree", "--full-tree", "-r", revision).
RunInDirBytes(repo.RepoPath())
if err != nil {
return nil, err
}
changes.Updates, err = parseGitLsTreeOutput(stdout)
return &changes, err
}
// nonGenesisChanges get changes since the previous indexer update
func nonGenesisChanges(repo *Repository, revision string) (*repoChanges, error) {
diffCmd := git.NewCommand("diff", "--name-status",
repo.IndexerStatus.CommitSha, revision)
stdout, err := diffCmd.RunInDir(repo.RepoPath())
if err != nil {
// previous commit sha may have been removed by a force push, so
// try rebuilding from scratch
log.Warn("git diff: %v", err)
if err = indexer.DeleteRepoFromIndexer(repo.ID); err != nil {
return nil, err
}
return genesisChanges(repo, revision)
}
var changes repoChanges
updatedFilenames := make([]string, 0, 10)
for _, line := range strings.Split(stdout, "\n") {
line = strings.TrimSpace(line)
if len(line) == 0 {
continue
}
filename := strings.TrimSpace(line[1:])
if len(filename) == 0 {
continue
} else if filename[0] == '"' {
filename, err = strconv.Unquote(filename)
if err != nil {
return nil, err
}
}
switch status := line[0]; status {
case 'M', 'A':
updatedFilenames = append(updatedFilenames, filename)
case 'D':
changes.RemovedFilenames = append(changes.RemovedFilenames, filename)
default:
log.Warn("Unrecognized status: %c (line=%s)", status, line)
}
}
cmd := git.NewCommand("ls-tree", "--full-tree", revision, "--")
cmd.AddArguments(updatedFilenames...)
lsTreeStdout, err := cmd.RunInDirBytes(repo.RepoPath())
if err != nil {
return nil, err
}
changes.Updates, err = parseGitLsTreeOutput(lsTreeStdout)
return &changes, err
}
func processRepoIndexerOperationQueue() {
for {
op := <-repoIndexerOperationQueue
if op.deleted {
if err := indexer.DeleteRepoFromIndexer(op.repo.ID); err != nil {
log.Error(4, "DeleteRepoFromIndexer: %v", err)
}
} else {
if err := updateRepoIndexer(op.repo); err != nil {
log.Error(4, "updateRepoIndexer: %v", err)
}
}
}
}
// DeleteRepoFromIndexer remove all of a repository's entries from the indexer
func DeleteRepoFromIndexer(repo *Repository) {
addOperationToQueue(repoIndexerOperation{repo: repo, deleted: true})
}
// UpdateRepoIndexer update a repository's entries in the indexer
func UpdateRepoIndexer(repo *Repository) {
addOperationToQueue(repoIndexerOperation{repo: repo, deleted: false})
}
func addOperationToQueue(op repoIndexerOperation) {
if !setting.Indexer.RepoIndexerEnabled {
return
}
select {
case repoIndexerOperationQueue <- op:
break
default:
go func() {
repoIndexerOperationQueue <- op
}()
}
}