2 files changed, 467 insertions, 0 deletions
diff --git a/services/repository/archiver/archiver.go b/services/repository/archiver/archiver.go
new file mode 100644
index 0000000000..7e886d79cb
--- /dev/null
+++ b/services/repository/archiver/archiver.go
@@ -0,0 +1,334 @@
+// Copyright 2020 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 archiver
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"regexp"
+	"strings"
+	"time"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/graceful"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/queue"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/storage"
+)
+
+// ArchiveRequest defines the parameters of an archive request, which notably
+// includes the specific repository being archived as well as the commit, the
+// name by which it was requested, and the kind of archive being requested.
+// This is entirely opaque to external entities, though, and mostly used as a
+// handle elsewhere.
+type ArchiveRequest struct {
+	RepoID   int64
+	refName  string
+	Type     git.ArchiveType
+	CommitID string
+}
+
+// SHA1 hashes will only go up to 40 characters, but SHA256 hashes will go all
+// the way to 64.
+var shaRegex = regexp.MustCompile(`^[0-9a-f]{4,64}$`)
+
+// ErrUnknownArchiveFormat request archive format is not supported
+type ErrUnknownArchiveFormat struct {
+	RequestFormat string
+}
+
+// Error implements error
+func (err ErrUnknownArchiveFormat) Error() string {
+	return fmt.Sprintf("unknown format: %s", err.RequestFormat)
+}
+
+// Is implements error
+func (ErrUnknownArchiveFormat) Is(err error) bool {
+	_, ok := err.(ErrUnknownArchiveFormat)
+	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.
+func NewRequest(repoID int64, repo *git.Repository, uri string) (*ArchiveRequest, error) {
+	r := &ArchiveRequest{
+		RepoID: repoID,
+	}
+
+	var ext string
+	switch {
+	case strings.HasSuffix(uri, ".zip"):
+		ext = ".zip"
+		r.Type = git.ZIP
+	case strings.HasSuffix(uri, ".tar.gz"):
+		ext = ".tar.gz"
+		r.Type = git.TARGZ
+	case strings.HasSuffix(uri, ".bundle"):
+		ext = ".bundle"
+		r.Type = git.BUNDLE
+	default:
+		return nil, ErrUnknownArchiveFormat{RequestFormat: uri}
+	}
+
+	r.refName = strings.TrimSuffix(uri, ext)
+
+	var err error
+	// Get corresponding commit.
+	if repo.IsBranchExist(r.refName) {
+		r.CommitID, err = repo.GetBranchCommitID(r.refName)
+		if err != nil {
+			return nil, err
+		}
+	} else if repo.IsTagExist(r.refName) {
+		r.CommitID, err = repo.GetTagCommitID(r.refName)
+		if err != nil {
+			return nil, err
+		}
+	} else if shaRegex.MatchString(r.refName) {
+		if repo.IsCommitExist(r.refName) {
+			r.CommitID = r.refName
+		} else {
+			return nil, git.ErrNotExist{
+				ID: r.refName,
+			}
+		}
+	} else {
+		return nil, fmt.Errorf("Unknow ref %s type", r.refName)
+	}
+
+	return r, nil
+}
+
+// GetArchiveName returns the name of the caller, based on the ref used by the
+// caller to create this request.
+func (aReq *ArchiveRequest) GetArchiveName() string {
+	return strings.ReplaceAll(aReq.refName, "/", "-") + "." + aReq.Type.String()
+}
+
+func doArchive(r *ArchiveRequest) (*repo_model.RepoArchiver, error) {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return nil, err
+	}
+	defer committer.Close()
+
+	archiver, err := repo_model.GetRepoArchiver(ctx, r.RepoID, r.Type, r.CommitID)
+	if err != nil {
+		return nil, err
+	}
+
+	if archiver != nil {
+		// FIXME: If another process are generating it, we think it's not ready and just return
+		// Or we should wait until the archive generated.
+		if archiver.Status == repo_model.ArchiverGenerating {
+			return nil, nil
+		}
+	} else {
+		archiver = &repo_model.RepoArchiver{
+			RepoID:   r.RepoID,
+			Type:     r.Type,
+			CommitID: r.CommitID,
+			Status:   repo_model.ArchiverGenerating,
+		}
+		if err := repo_model.AddRepoArchiver(ctx, archiver); err != nil {
+			return nil, err
+		}
+	}
+
+	rPath, err := archiver.RelativePath()
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = storage.RepoArchives.Stat(rPath)
+	if err == nil {
+		if archiver.Status == repo_model.ArchiverGenerating {
+			archiver.Status = repo_model.ArchiverReady
+			if err = repo_model.UpdateRepoArchiverStatus(ctx, archiver); err != nil {
+				return nil, err
+			}
+		}
+		return archiver, committer.Commit()
+	}
+
+	if !errors.Is(err, os.ErrNotExist) {
+		return nil, fmt.Errorf("unable to stat archive: %v", err)
+	}
+
+	rd, w := io.Pipe()
+	defer func() {
+		w.Close()
+		rd.Close()
+	}()
+	var done = make(chan error)
+	repo, err := models.LoadArchiverRepo(archiver)
+	if err != nil {
+		return nil, fmt.Errorf("archiver.LoadRepo failed: %v", err)
+	}
+
+	gitRepo, err := git.OpenRepository(repo.RepoPath())
+	if err != nil {
+		return nil, err
+	}
+	defer gitRepo.Close()
+
+	go func(done chan error, w *io.PipeWriter, archiver *repo_model.RepoArchiver, gitRepo *git.Repository) {
+		defer func() {
+			if r := recover(); r != nil {
+				done <- fmt.Errorf("%v", r)
+			}
+		}()
+
+		if archiver.Type == git.BUNDLE {
+			err = gitRepo.CreateBundle(
+				graceful.GetManager().ShutdownContext(),
+				archiver.CommitID,
+				w,
+			)
+		} else {
+			err = gitRepo.CreateArchive(
+				graceful.GetManager().ShutdownContext(),
+				archiver.Type,
+				w,
+				setting.Repository.PrefixArchiveFiles,
+				archiver.CommitID,
+			)
+		}
+		_ = w.CloseWithError(err)
+		done <- err
+	}(done, w, archiver, gitRepo)
+
+	// TODO: add lfs data to zip
+	// TODO: add submodule data to zip
+
+	if _, err := storage.RepoArchives.Save(rPath, rd, -1); err != nil {
+		return nil, fmt.Errorf("unable to write archive: %v", err)
+	}
+
+	err = <-done
+	if err != nil {
+		return nil, err
+	}
+
+	if archiver.Status == repo_model.ArchiverGenerating {
+		archiver.Status = repo_model.ArchiverReady
+		if err = repo_model.UpdateRepoArchiverStatus(ctx, archiver); err != nil {
+			return nil, err
+		}
+	}
+
+	return archiver, committer.Commit()
+}
+
+// ArchiveRepository satisfies the ArchiveRequest being passed in.  Processing
+// will occur in a separate goroutine, as this phase may take a while to
+// complete.  If the archive already exists, ArchiveRepository will not do
+// anything.  In all cases, the caller should be examining the *ArchiveRequest
+// being returned for completion, as it may be different than the one they passed
+// in.
+func ArchiveRepository(request *ArchiveRequest) (*repo_model.RepoArchiver, error) {
+	return doArchive(request)
+}
+
+var archiverQueue queue.UniqueQueue
+
+// Init initlize archive
+func Init() error {
+	handler := func(data ...queue.Data) {
+		for _, datum := range data {
+			archiveReq, ok := datum.(*ArchiveRequest)
+			if !ok {
+				log.Error("Unable to process provided datum: %v - not possible to cast to IndexerData", datum)
+				continue
+			}
+			log.Trace("ArchiverData Process: %#v", archiveReq)
+			if _, err := doArchive(archiveReq); err != nil {
+				log.Error("Archive %v faild: %v", datum, err)
+			}
+		}
+	}
+
+	archiverQueue = queue.CreateUniqueQueue("repo-archive", handler, new(ArchiveRequest))
+	if archiverQueue == nil {
+		return errors.New("unable to create codes indexer queue")
+	}
+
+	go graceful.GetManager().RunWithShutdownFns(archiverQueue.Run)
+
+	return nil
+}
+
+// StartArchive push the archive request to the queue
+func StartArchive(request *ArchiveRequest) error {
+	has, err := archiverQueue.Has(request)
+	if err != nil {
+		return err
+	}
+	if has {
+		return nil
+	}
+	return archiverQueue.Push(request)
+}
+
+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
+	}
+	if err := storage.RepoArchives.Delete(p); err != nil {
+		log.Error("delete repo archive file failed: %v", err)
+	}
+	return nil
+}
+
+// DeleteOldRepositoryArchives deletes old repository archives.
+func DeleteOldRepositoryArchives(ctx context.Context, olderThan time.Duration) error {
+	log.Trace("Doing: ArchiveCleanup")
+
+	for {
+		archivers, err := repo_model.FindRepoArchives(repo_model.FindRepoArchiversOption{
+			ListOptions: db.ListOptions{
+				PageSize: 100,
+				Page:     1,
+			},
+			OlderThan: olderThan,
+		})
+		if err != nil {
+			log.Trace("Error: ArchiveClean: %v", err)
+			return err
+		}
+
+		for _, archiver := range archivers {
+			if err := deleteOldRepoArchiver(ctx, archiver); err != nil {
+				return err
+			}
+		}
+		if len(archivers) < 100 {
+			break
+		}
+	}
+
+	log.Trace("Finished: ArchiveCleanup")
+	return nil
+}
+
+// DeleteRepositoryArchives deletes all repositories' archives.
+func DeleteRepositoryArchives(ctx context.Context) error {
+	if err := repo_model.DeleteAllRepoArchives(); err != nil {
+		return err
+	}
+	return storage.Clean(storage.RepoArchives)
+}
diff --git a/services/repository/archiver/archiver_test.go b/services/repository/archiver/archiver_test.go
new file mode 100644
index 0000000000..2c0b46d3d4
--- /dev/null
+++ b/services/repository/archiver/archiver_test.go
@@ -0,0 +1,133 @@
+// Copyright 2020 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 archiver
+
+import (
+	"errors"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/test"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m, filepath.Join("..", "..", ".."))
+}
+
+func TestArchive_Basic(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	ctx := test.MockContext(t, "user27/repo49")
+	firstCommit, secondCommit := "51f84af23134", "aacbdfe9e1c4"
+
+	test.LoadRepo(t, ctx, 49)
+	test.LoadGitRepo(t, ctx)
+	defer ctx.Repo.GitRepo.Close()
+
+	bogusReq, err := NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, firstCommit+".zip")
+	assert.NoError(t, err)
+	assert.NotNil(t, bogusReq)
+	assert.EqualValues(t, firstCommit+".zip", bogusReq.GetArchiveName())
+
+	// Check a series of bogus requests.
+	// Step 1, valid commit with a bad extension.
+	bogusReq, err = NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, firstCommit+".dilbert")
+	assert.Error(t, err)
+	assert.Nil(t, bogusReq)
+
+	// Step 2, missing commit.
+	bogusReq, err = NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, "dbffff.zip")
+	assert.Error(t, err)
+	assert.Nil(t, bogusReq)
+
+	// Step 3, doesn't look like branch/tag/commit.
+	bogusReq, err = NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, "db.zip")
+	assert.Error(t, err)
+	assert.Nil(t, bogusReq)
+
+	bogusReq, err = NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, "master.zip")
+	assert.NoError(t, err)
+	assert.NotNil(t, bogusReq)
+	assert.EqualValues(t, "master.zip", bogusReq.GetArchiveName())
+
+	bogusReq, err = NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, "test/archive.zip")
+	assert.NoError(t, err)
+	assert.NotNil(t, bogusReq)
+	assert.EqualValues(t, "test-archive.zip", bogusReq.GetArchiveName())
+
+	// Now two valid requests, firstCommit with valid extensions.
+	zipReq, err := NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, firstCommit+".zip")
+	assert.NoError(t, err)
+	assert.NotNil(t, zipReq)
+
+	tgzReq, err := NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, firstCommit+".tar.gz")
+	assert.NoError(t, err)
+	assert.NotNil(t, tgzReq)
+
+	secondReq, err := NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, secondCommit+".zip")
+	assert.NoError(t, err)
+	assert.NotNil(t, secondReq)
+
+	inFlight := make([]*ArchiveRequest, 3)
+	inFlight[0] = zipReq
+	inFlight[1] = tgzReq
+	inFlight[2] = secondReq
+
+	ArchiveRepository(zipReq)
+	ArchiveRepository(tgzReq)
+	ArchiveRepository(secondReq)
+
+	// Make sure sending an unprocessed request through doesn't affect the queue
+	// count.
+	ArchiveRepository(zipReq)
+
+	// Sleep two seconds to make sure the queue doesn't change.
+	time.Sleep(2 * time.Second)
+
+	zipReq2, err := NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, firstCommit+".zip")
+	assert.NoError(t, err)
+	// This zipReq should match what's sitting in the queue, as we haven't
+	// let it release yet.  From the consumer's point of view, this looks like
+	// a long-running archive task.
+	assert.Equal(t, zipReq, zipReq2)
+
+	// We still have the other three stalled at completion, waiting to remove
+	// from archiveInProgress.  Try to submit this new one before its
+	// predecessor has cleared out of the queue.
+	ArchiveRepository(zipReq2)
+
+	// Now we'll submit a request and TimedWaitForCompletion twice, before and
+	// after we release it.  We should trigger both the timeout and non-timeout
+	// cases.
+	timedReq, err := NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, secondCommit+".tar.gz")
+	assert.NoError(t, err)
+	assert.NotNil(t, timedReq)
+	ArchiveRepository(timedReq)
+
+	zipReq2, err = NewRequest(ctx.Repo.Repository.ID, ctx.Repo.GitRepo, firstCommit+".zip")
+	assert.NoError(t, err)
+	// Now, we're guaranteed to have released the original zipReq from the queue.
+	// Ensure that we don't get handed back the released entry somehow, but they
+	// should remain functionally equivalent in all fields.  The exception here
+	// is zipReq.cchan, which will be non-nil because it's a completed request.
+	// It's fine to go ahead and set it to nil now.
+
+	assert.Equal(t, zipReq, zipReq2)
+	assert.False(t, zipReq == zipReq2)
+
+	// Same commit, different compression formats should have different names.
+	// Ideally, the extension would match what we originally requested.
+	assert.NotEqual(t, zipReq.GetArchiveName(), tgzReq.GetArchiveName())
+	assert.NotEqual(t, zipReq.GetArchiveName(), secondReq.GetArchiveName())
+}
+
+func TestErrUnknownArchiveFormat(t *testing.T) {
+	var err = ErrUnknownArchiveFormat{RequestFormat: "master"}
+	assert.True(t, errors.Is(err, ErrUnknownArchiveFormat{}))
+}