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fix hard-coded timeout and error panic in API archive download endpoint (#20925)

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* fix hard-coded timeout and error panic in API archive download endpoint

This commit updates the `GET /api/v1/repos/{owner}/{repo}/archive/{archive}`
endpoint which prior to this PR had a couple of issues.

1. The endpoint had a hard-coded 20s timeout for the archiver to complete after
   which a 500 (Internal Server Error) was returned to client. For a scripted
   API client there was no clear way of telling that the operation timed out and
   that it should retry.

2. Whenever the timeout _did occur_, the code used to panic. This was caused by
   the API endpoint "delegating" to the same call path as the web, which uses a
   slightly different way of reporting errors (HTML rather than JSON for
   example).

   More specifically, `api/v1/repo/file.go#GetArchive` just called through to
   `web/repo/repo.go#Download`, which expects the `Context` to have a `Render`
   field set, but which is `nil` for API calls. Hence, a `nil` pointer error.

The code addresses (1) by dropping the hard-coded timeout. Instead, any
timeout/cancelation on the incoming `Context` is used.

The code addresses (2) by updating the API endpoint to use a separate call path
for the API-triggered archive download. This avoids producing HTML-errors on
errors (it now produces JSON errors).

Signed-off-by: Peter Gardfjäll <peter.gardfjall.work@gmail.com>
This commit is contained in:
Peter Gardfjäll 2022-08-29 11:45:20 +02:00 committed by GitHub
parent 41c76ad714
commit 4562d40fce
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 122 additions and 71 deletions
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7
cmd/migrate_storage.go
View file

@ -112,11 +112,8 @@ func migrateRepoAvatars(ctx context.Context, dstStorage storage.ObjectStorage) e
func migrateRepoArchivers(ctx context.Context, dstStorage storage.ObjectStorage) error {
return db.IterateObjects(ctx, func(archiver *repo_model.RepoArchiver) error {
p, err := archiver.RelativePath()
if err != nil {
return err
}
_, err = storage.Copy(dstStorage, p, storage.RepoArchives, p)
p := archiver.RelativePath()
_, err := storage.Copy(dstStorage, p, storage.RepoArchives, p)
return err
})
}

3
models/repo.go
View file

@ -218,8 +218,7 @@ func DeleteRepository(doer *user_model.User, uid, repoID int64) error {
archivePaths := make([]string, 0, len(archives))
for _, v := range archives {
p, _ := v.RelativePath()
archivePaths = append(archivePaths, p)
archivePaths = append(archivePaths, v.RelativePath())
}
if _, err := db.DeleteByBean(ctx, &repo_model.RepoArchiver{RepoID: repoID}); err != nil {

6
models/repo/archiver.go
View file

@ -39,9 +39,9 @@ func init() {
db.RegisterModel(new(RepoArchiver))
}
// RelativePath returns relative path
func (archiver *RepoArchiver) RelativePath() (string, error) {
return fmt.Sprintf("%d/%s/%s.%s", archiver.RepoID, archiver.CommitID[:2], archiver.CommitID, archiver.Type.String()), nil
// RelativePath returns the archive path relative to the archive storage root.
func (archiver *RepoArchiver) RelativePath() string {
return fmt.Sprintf("%d/%s/%s.%s", archiver.RepoID, archiver.CommitID[:2], archiver.CommitID, archiver.Type.String())
}
var delRepoArchiver = new(RepoArchiver)

51
routers/api/v1/repo/file.go
View file

@ -8,6 +8,7 @@ package repo
import (
"bytes"
"encoding/base64"
"errors"
"fmt"
"io"
"net/http"
@ -28,7 +29,7 @@ import (
api "code.gitea.io/gitea/modules/structs"
"code.gitea.io/gitea/modules/web"
"code.gitea.io/gitea/routers/common"
"code.gitea.io/gitea/routers/web/repo"
archiver_service "code.gitea.io/gitea/services/repository/archiver"
files_service "code.gitea.io/gitea/services/repository/files"
)
@ -294,7 +295,53 @@ func GetArchive(ctx *context.APIContext) {
defer gitRepo.Close()
}
repo.Download(ctx.Context)
archiveDownload(ctx)
}
func archiveDownload(ctx *context.APIContext) {
uri := ctx.Params("*")
aReq, err := archiver_service.NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, uri)
if err != nil {
if errors.Is(err, archiver_service.ErrUnknownArchiveFormat{}) {
ctx.Error(http.StatusBadRequest, "unknown archive format", err)
} else if errors.Is(err, archiver_service.RepoRefNotFoundError{}) {
ctx.Error(http.StatusNotFound, "unrecognized reference", err)
} else {
ctx.ServerError("archiver_service.NewRequest", err)
}
return
}
archiver, err := aReq.Await(ctx)
if err != nil {
ctx.ServerError("archiver.Await", err)
return
}
download(ctx, aReq.GetArchiveName(), archiver)
}
func download(ctx *context.APIContext, archiveName string, archiver *repo_model.RepoArchiver) {
downloadName := ctx.Repo.Repository.Name + "-" + archiveName
rPath := archiver.RelativePath()
if setting.RepoArchive.ServeDirect {
// If we have a signed url (S3, object storage), redirect to this directly.
u, err := storage.RepoArchives.URL(rPath, downloadName)
if u != nil && err == nil {
ctx.Redirect(u.String())
return
}
}
// If we have matched and access to release or issue
fr, err := storage.RepoArchives.Open(rPath)
if err != nil {
ctx.ServerError("Open", err)
return
}
defer fr.Close()
ctx.ServeContent(downloadName, fr, archiver.CreatedUnix.AsLocalTime())
}
// GetEditorconfig get editor config of a repository

55
routers/web/repo/repo.go
View file

@ -10,7 +10,6 @@ import (
"fmt"
"net/http"
"strings"
"time"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/models/db"
@ -22,7 +21,6 @@ import (
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/convert"
"code.gitea.io/gitea/modules/graceful"
"code.gitea.io/gitea/modules/log"
repo_module "code.gitea.io/gitea/modules/repository"
"code.gitea.io/gitea/modules/setting"
@ -390,68 +388,27 @@ func Download(ctx *context.Context) {
if err != nil {
if errors.Is(err, archiver_service.ErrUnknownArchiveFormat{}) {
ctx.Error(http.StatusBadRequest, err.Error())
} else if errors.Is(err, archiver_service.RepoRefNotFoundError{}) {
ctx.Error(http.StatusNotFound, err.Error())
} else {
ctx.ServerError("archiver_service.NewRequest", err)
}
return
}
if aReq == nil {
ctx.Error(http.StatusNotFound)
return
}
archiver, err := repo_model.GetRepoArchiver(ctx, aReq.RepoID, aReq.Type, aReq.CommitID)
archiver, err := aReq.Await(ctx)
if err != nil {
ctx.ServerError("models.GetRepoArchiver", err)
ctx.ServerError("archiver.Await", err)
return
}
if archiver != nil && archiver.Status == repo_model.ArchiverReady {
download(ctx, aReq.GetArchiveName(), archiver)
return
}
if err := archiver_service.StartArchive(aReq); err != nil {
ctx.ServerError("archiver_service.StartArchive", err)
return
}
var times int
t := time.NewTicker(time.Second * 1)
defer t.Stop()
for {
select {
case <-graceful.GetManager().HammerContext().Done():
log.Warn("exit archive download because system stop")
return
case <-t.C:
if times > 20 {
ctx.ServerError("wait download timeout", nil)
return
}
times++
archiver, err = repo_model.GetRepoArchiver(ctx, aReq.RepoID, aReq.Type, aReq.CommitID)
if err != nil {
ctx.ServerError("archiver_service.StartArchive", err)
return
}
if archiver != nil && archiver.Status == repo_model.ArchiverReady {
download(ctx, aReq.GetArchiveName(), archiver)
return
}
}
}
}
func download(ctx *context.Context, archiveName string, archiver *repo_model.RepoArchiver) {
downloadName := ctx.Repo.Repository.Name + "-" + archiveName
rPath, err := archiver.RelativePath()
if err != nil {
ctx.ServerError("archiver.RelativePath", err)
return
}
rPath := archiver.RelativePath()
if setting.RepoArchive.ServeDirect {
// If we have a signed url (S3, object storage), redirect to this directly.
u, err := storage.RepoArchives.URL(rPath, downloadName)

71
services/repository/archiver/archiver.go
View file

@ -57,6 +57,21 @@ func (ErrUnknownArchiveFormat) Is(err error) bool {
return ok
}
// RepoRefNotFoundError is returned when a requested reference (commit, tag) was not found.
type RepoRefNotFoundError struct {
RefName string
}
// Error implements error.
func (e RepoRefNotFoundError) Error() string {
return fmt.Sprintf("unrecognized repository reference: %s", e.RefName)
}
func (e RepoRefNotFoundError) Is(err error) bool {
_, ok := err.(RepoRefNotFoundError)
return ok
}
// NewRequest creates an archival request, based on the URI. The
// resulting ArchiveRequest is suitable for being passed to ArchiveRepository()
// if it's determined that the request still needs to be satisfied.
@ -103,7 +118,7 @@ func NewRequest(repoID int64, repo *git.Repository, uri string) (*ArchiveRequest
}
}
} else {
return nil, fmt.Errorf("Unknow ref %s type", r.refName)
return nil, RepoRefNotFoundError{RefName: r.refName}
}
return r, nil
@ -115,6 +130,49 @@ func (aReq *ArchiveRequest) GetArchiveName() string {
return strings.ReplaceAll(aReq.refName, "/", "-") + "." + aReq.Type.String()
}
// Await awaits the completion of an ArchiveRequest. If the archive has
// already been prepared the method returns immediately. Otherwise an archiver
// process will be started and its completion awaited. On success the returned
// RepoArchiver may be used to download the archive. Note that even if the
// context is cancelled/times out a started archiver will still continue to run
// in the background.
func (aReq *ArchiveRequest) Await(ctx context.Context) (*repo_model.RepoArchiver, error) {
archiver, err := repo_model.GetRepoArchiver(ctx, aReq.RepoID, aReq.Type, aReq.CommitID)
if err != nil {
return nil, fmt.Errorf("models.GetRepoArchiver: %v", err)
}
if archiver != nil && archiver.Status == repo_model.ArchiverReady {
// Archive already generated, we're done.
return archiver, nil
}
if err := StartArchive(aReq); err != nil {
return nil, fmt.Errorf("archiver.StartArchive: %v", err)
}
poll := time.NewTicker(time.Second * 1)
defer poll.Stop()
for {
select {
case <-graceful.GetManager().HammerContext().Done():
// System stopped.
return nil, graceful.GetManager().HammerContext().Err()
case <-ctx.Done():
return nil, ctx.Err()
case <-poll.C:
archiver, err = repo_model.GetRepoArchiver(ctx, aReq.RepoID, aReq.Type, aReq.CommitID)
if err != nil {
return nil, fmt.Errorf("repo_model.GetRepoArchiver: %v", err)
}
if archiver != nil && archiver.Status == repo_model.ArchiverReady {
return archiver, nil
}
}
}
}
func doArchive(r *ArchiveRequest) (*repo_model.RepoArchiver, error) {
txCtx, committer, err := db.TxContext()
if err != nil {
@ -147,11 +205,7 @@ func doArchive(r *ArchiveRequest) (*repo_model.RepoArchiver, error) {
}
}
rPath, err := archiver.RelativePath()
if err != nil {
return nil, err
}
rPath := archiver.RelativePath()
_, err = storage.RepoArchives.Stat(rPath)
if err == nil {
if archiver.Status == repo_model.ArchiverGenerating {
@ -284,13 +338,10 @@ func StartArchive(request *ArchiveRequest) error {
}
func deleteOldRepoArchiver(ctx context.Context, archiver *repo_model.RepoArchiver) error {
p, err := archiver.RelativePath()
if err != nil {
return err
}
if err := repo_model.DeleteRepoArchiver(ctx, archiver); err != nil {
return err
}
p := archiver.RelativePath()
if err := storage.RepoArchives.Delete(p); err != nil {
log.Error("delete repo archive file failed: %v", err)
}