Support compression for Actions logs (#31761)

Support compression for Actions logs to save storage space and
bandwidth. Inspired by
#24256 (comment)

The biggest challenge is that the compression format should support
[seekable](https://github.com/facebook/zstd/blob/dev/contrib/seekable_format/zstd_seekable_compression_format.md).
So when users are viewing a part of the log lines, Gitea doesn't need to
download the whole compressed file and decompress it.

That means gzip cannot help here. And I did research, there aren't too
many choices, like bgzip and xz, but I think zstd is the most popular
one. It has an implementation in Golang with
[zstd](https://github.com/klauspost/compress/tree/master/zstd) and
[zstd-seekable-format-go](https://github.com/SaveTheRbtz/zstd-seekable-format-go),
and what is better is that it has good compatibility: a seekable format
zstd file can be read by a regular zstd reader.

This PR introduces a new package `zstd` to combine and wrap the two
packages, to provide a unified and easy-to-use API.

And a new setting `LOG_COMPRESSION` is added to the config, although I
don't see any reason why not to use compression, I think's it's a good
idea to keep the default with `none` to be consistent with old versions.

`LOG_COMPRESSION` takes effect for only new log files, it adds `.zst` as
an extension to the file name, so Gitea can determine if it needs
decompression according to the file name when reading. Old files will
keep the format since it's not worth converting them, as they will be
cleared after #31735.

<img width="541" alt="image"
src="https://github.com/user-attachments/assets/e9598764-a4e0-4b68-8c2b-f769265183c9">

Author: wolfogre

assets/go-licenses.json

@@ -2687,6 +2687,12 @@ LEVEL = Info
 ;DEFAULT_ACTIONS_URL = github
 ;; Logs retention time in days. Old logs will be deleted after this period.
 ;LOG_RETENTION_DAYS = 365
+;; Log compression type, `none` for no compression, `zstd` for zstd compression.
+;; Other compression types like `gzip` if NOT supported, since seekable stream is required for log view.
+;; It's always recommended to use compression when using local disk as log storage if CPU or memory is not a bottleneck.
+;; And for object storage services like S3, which is billed for requests, it would cause extra 2 times of get requests for each log view.
+;; But it will save storage space and network bandwidth, so it's still recommended to use compression.
+;LOG_COMPRESSION = none
 ;; Default artifact retention time in days. Artifacts could have their own retention periods by setting the `retention-days` option in `actions/upload-artifact` step.
 ;ARTIFACT_RETENTION_DAYS = 90
 ;; Timeout to stop the task which have running status, but haven't been updated for a long time

custom/conf/app.example.ini

@@ -20,6 +20,7 @@ require (
 	github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358
 	github.com/ProtonMail/go-crypto v1.0.0
 	github.com/PuerkitoBio/goquery v1.9.2
+	github.com/SaveTheRbtz/zstd-seekable-format-go/pkg v0.7.2
 	github.com/alecthomas/chroma/v2 v2.14.0
 	github.com/blakesmith/ar v0.0.0-20190502131153-809d4375e1fb
 	github.com/blevesearch/bleve/v2 v2.4.2
@@ -209,6 +210,7 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.4 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
+	github.com/google/btree v1.1.2 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/go-tpm v0.9.0 // indirect
 	github.com/gorilla/css v1.0.1 // indirect

go.mod

@@ -80,6 +80,8 @@ github.com/RoaringBitmap/roaring v0.4.23/go.mod h1:D0gp8kJQgE1A4LQ5wFLggQEyvDi06
 github.com/RoaringBitmap/roaring v0.7.1/go.mod h1:jdT9ykXwHFNdJbEtxePexlFYH9LXucApeS0/+/g+p1I=
 github.com/RoaringBitmap/roaring v1.9.4 h1:yhEIoH4YezLYT04s1nHehNO64EKFTop/wBhxv2QzDdQ=
 github.com/RoaringBitmap/roaring v1.9.4/go.mod h1:6AXUsoIEzDTFFQCe1RbGA6uFONMhvejWj5rqITANK90=
+github.com/SaveTheRbtz/zstd-seekable-format-go/pkg v0.7.2 h1:cSXom2MoKJ9KPPw29RoZtHvUETY4F4n/kXl8m9btnQ0=
+github.com/SaveTheRbtz/zstd-seekable-format-go/pkg v0.7.2/go.mod h1:JitQWJ8JuV4Y87l8VsHiiwhb3cgdyn68mX40s7NT6PA=
 github.com/alecthomas/assert/v2 v2.7.0 h1:QtqSACNS3tF7oasA8CU6A6sXZSBDqnm7RfpLl9bZqbE=
 github.com/alecthomas/assert/v2 v2.7.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
 github.com/alecthomas/chroma/v2 v2.2.0/go.mod h1:vf4zrexSH54oEjJ7EdB65tGNHmH3pGZmVkgTP5RHvAs=
@@ -395,6 +397,8 @@ github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEW
 github.com/golang/snappy v0.0.2/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
 github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/btree v1.1.2 h1:xf4v41cLI2Z6FxbKm+8Bu+m8ifhj15JuZ9sa0jZCMUU=
+github.com/google/btree v1.1.2/go.mod h1:qOPhT0dTNdNzV6Z/lhRX0YXUafgPLFUh+gZMl761Gm4=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=

go.sum

@@ -502,7 +502,13 @@ func convertTimestamp(timestamp *timestamppb.Timestamp) timeutil.TimeStamp {
 }
 
 func logFileName(repoFullName string, taskID int64) string {
-	return fmt.Sprintf("%s/%02x/%d.log", repoFullName, taskID%256, taskID)
+	ret := fmt.Sprintf("%s/%02x/%d.log", repoFullName, taskID%256, taskID)
+
+	if setting.Actions.LogCompression.IsZstd() {
+		ret += ".zst"
+	}
+
+	return ret
 }
 
 func getTaskIDFromCache(token string) int64 {

models/actions/task.go

@@ -15,6 +15,7 @@ import (
 	"code.gitea.io/gitea/models/dbfs"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/storage"
+	"code.gitea.io/gitea/modules/zstd"
 
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
 	"google.golang.org/protobuf/types/known/timestamppb"
@@ -28,6 +29,9 @@ const (
 	defaultBufSize = MaxLineSize
 )
 
+// WriteLogs appends logs to DBFS file for temporary storage.
+// It doesn't respect the file format in the filename like ".zst", since it's difficult to reopen a closed compressed file and append new content.
+// Why doesn't it store logs in object storage directly? Because it's not efficient to append content to object storage.
 func WriteLogs(ctx context.Context, filename string, offset int64, rows []*runnerv1.LogRow) ([]int, error) {
 	flag := os.O_WRONLY
 	if offset == 0 {
@@ -106,6 +110,17 @@ func ReadLogs(ctx context.Context, inStorage bool, filename string, offset, limi
 	return rows, nil
 }
 
+const (
+	// logZstdBlockSize is the block size for zstd compression.
+	// 128KB leads the compression ratio to be close to the regular zstd compression.
+	// And it means each read from the underlying object storage will be at least 128KB*(compression ratio).
+	// The compression ratio is about 30% for text files, so the actual read size is about 38KB, which should be acceptable.
+	logZstdBlockSize = 128 * 1024 // 128KB
+)
+
+// TransferLogs transfers logs from DBFS to object storage.
+// It happens when the file is complete and no more logs will be appended.
+// It respects the file format in the filename like ".zst", and compresses the content if needed.
 func TransferLogs(ctx context.Context, filename string) (func(), error) {
 	name := DBFSPrefix + filename
 	remove := func() {
@@ -119,7 +134,26 @@ func TransferLogs(ctx context.Context, filename string) (func(), error) {
 	}
 	defer f.Close()
 
-	if _, err := storage.Actions.Save(filename, f, -1); err != nil {
+	var reader io.Reader = f
+	if strings.HasSuffix(filename, ".zst") {
+		r, w := io.Pipe()
+		reader = r
+		zstdWriter, err := zstd.NewSeekableWriter(w, logZstdBlockSize)
+		if err != nil {
+			return nil, fmt.Errorf("zstd NewSeekableWriter: %w", err)
+		}
+		go func() {
+			defer func() {
+				_ = w.CloseWithError(zstdWriter.Close())
+			}()
+			if _, err := io.Copy(zstdWriter, f); err != nil {
+				_ = w.CloseWithError(err)
+				return
+			}
+		}()
+	}
+
+	if _, err := storage.Actions.Save(filename, reader, -1); err != nil {
 		return nil, fmt.Errorf("storage save %q: %w", filename, err)
 	}
 	return remove, nil
@@ -150,11 +184,22 @@ func OpenLogs(ctx context.Context, inStorage bool, filename string) (io.ReadSeek
 		}
 		return f, nil
 	}
+
 	f, err := storage.Actions.Open(filename)
 	if err != nil {
 		return nil, fmt.Errorf("storage open %q: %w", filename, err)
 	}
-	return f, nil
+
+	var reader io.ReadSeekCloser = f
+	if strings.HasSuffix(filename, ".zst") {
+		r, err := zstd.NewSeekableReader(f)
+		if err != nil {
+			return nil, fmt.Errorf("zstd NewSeekableReader: %w", err)
+		}
+		reader = r
+	}
+
+	return reader, nil
 }
 
 func FormatLog(timestamp time.Time, content string) string {

modules/actions/log.go

@@ -13,8 +13,7 @@ import (
 	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/validation"
-
-	"github.com/klauspost/compress/zstd"
+	"code.gitea.io/gitea/modules/zstd"
 )
 
 var (

modules/packages/conda/metadata.go

@@ -10,8 +10,9 @@ import (
 	"io"
 	"testing"
 
+	"code.gitea.io/gitea/modules/zstd"
+
 	"github.com/dsnet/compress/bzip2"
-	"github.com/klauspost/compress/zstd"
 	"github.com/stretchr/testify/assert"
 )
 

modules/packages/conda/metadata_test.go

@@ -14,9 +14,9 @@ import (
 
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/validation"
+	"code.gitea.io/gitea/modules/zstd"
 
 	"github.com/blakesmith/ar"
-	"github.com/klauspost/compress/zstd"
 	"github.com/ulikunitz/xz"
 )
 

modules/packages/debian/metadata.go

@@ -10,8 +10,9 @@ import (
 	"io"
 	"testing"
 
+	"code.gitea.io/gitea/modules/zstd"
+
 	"github.com/blakesmith/ar"
-	"github.com/klauspost/compress/zstd"
 	"github.com/stretchr/testify/assert"
 	"github.com/ulikunitz/xz"
 )

modules/packages/debian/metadata_test.go

@@ -17,6 +17,7 @@ var (
 		Enabled               bool
 		LogStorage            *Storage          // how the created logs should be stored
 		LogRetentionDays      int64             `ini:"LOG_RETENTION_DAYS"`
+		LogCompression        logCompression    `ini:"LOG_COMPRESSION"`
 		ArtifactStorage       *Storage          // how the created artifacts should be stored
 		ArtifactRetentionDays int64             `ini:"ARTIFACT_RETENTION_DAYS"`
 		DefaultActionsURL     defaultActionsURL `ini:"DEFAULT_ACTIONS_URL"`
@@ -54,6 +55,20 @@ const (
 	// please consider to use `uses: https://the_url_you_want_to_use/username/action_name@version` instead.
 )
 
+type logCompression string
+
+func (c logCompression) IsValid() bool {
+	return c.IsNone() || c.IsZstd()
+}
+
+func (c logCompression) IsNone() bool {
+	return c == "" || strings.ToLower(string(c)) == "none"
+}
+
+func (c logCompression) IsZstd() bool {
+	return strings.ToLower(string(c)) == "zstd"
+}
+
 func loadActionsFrom(rootCfg ConfigProvider) error {
 	sec := rootCfg.Section("actions")
 	err := sec.MapTo(&Actions)
@@ -100,5 +115,9 @@ func loadActionsFrom(rootCfg ConfigProvider) error {
 	Actions.EndlessTaskTimeout = sec.Key("ENDLESS_TASK_TIMEOUT").MustDuration(3 * time.Hour)
 	Actions.AbandonedJobTimeout = sec.Key("ABANDONED_JOB_TIMEOUT").MustDuration(24 * time.Hour)
 
+	if !Actions.LogCompression.IsValid() {
+		return fmt.Errorf("invalid [actions] LOG_COMPRESSION: %q", Actions.LogCompression)
+	}
+
 	return nil
 }

modules/setting/actions.go

@@ -0,0 +1,46 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package zstd
+
+import "github.com/klauspost/compress/zstd"
+
+type WriterOption = zstd.EOption
+
+var (
+	WithEncoderCRC               = zstd.WithEncoderCRC
+	WithEncoderConcurrency       = zstd.WithEncoderConcurrency
+	WithWindowSize               = zstd.WithWindowSize
+	WithEncoderPadding           = zstd.WithEncoderPadding
+	WithEncoderLevel             = zstd.WithEncoderLevel
+	WithZeroFrames               = zstd.WithZeroFrames
+	WithAllLitEntropyCompression = zstd.WithAllLitEntropyCompression
+	WithNoEntropyCompression     = zstd.WithNoEntropyCompression
+	WithSingleSegment            = zstd.WithSingleSegment
+	WithLowerEncoderMem          = zstd.WithLowerEncoderMem
+	WithEncoderDict              = zstd.WithEncoderDict
+	WithEncoderDictRaw           = zstd.WithEncoderDictRaw
+)
+
+type EncoderLevel = zstd.EncoderLevel
+
+const (
+	SpeedFastest           EncoderLevel = zstd.SpeedFastest
+	SpeedDefault           EncoderLevel = zstd.SpeedDefault
+	SpeedBetterCompression EncoderLevel = zstd.SpeedBetterCompression
+	SpeedBestCompression   EncoderLevel = zstd.SpeedBestCompression
+)
+
+type ReaderOption = zstd.DOption
+
+var (
+	WithDecoderLowmem      = zstd.WithDecoderLowmem
+	WithDecoderConcurrency = zstd.WithDecoderConcurrency
+	WithDecoderMaxMemory   = zstd.WithDecoderMaxMemory
+	WithDecoderDicts       = zstd.WithDecoderDicts
+	WithDecoderDictRaw     = zstd.WithDecoderDictRaw
+	WithDecoderMaxWindow   = zstd.WithDecoderMaxWindow
+	WithDecodeAllCapLimit  = zstd.WithDecodeAllCapLimit
+	WithDecodeBuffersBelow = zstd.WithDecodeBuffersBelow
+	IgnoreChecksum         = zstd.IgnoreChecksum
+)