内容压缩支持对已压缩内容重新压缩

internal/apps/log_writer.go

@@ -39,21 +39,22 @@ func (this *LogWriter) Init() {
 
 func (this *LogWriter) Write(message string) {
 	// 文件和行号
-	var callDepth = 3
+	var callDepth = 2
 	var file string
 	var line int
 	var ok bool
 	_, file, line, ok = runtime.Caller(callDepth)
-	if !ok {
-		file = "???"
-		line = 0
-	} else {
+	if ok {
 		file = filepath.Base(file)
 	}
 
 	backgroundEnv, _ := os.LookupEnv("EdgeBackground")
 	if backgroundEnv != "on" {
-		log.Println(message + " (" + file + ":" + strconv.Itoa(line) + ")")
+		if len(file) > 0 {
+			log.Println(message + " (" + file + ":" + strconv.Itoa(line) + ")")
+		} else {
+			log.Println(message)
+		}
 	}
 
 	if this.fileAppender != nil {

internal/compressions/reader.go

@@ -0,0 +1,8 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package compressions
+
+type Reader interface {
+	Read(p []byte) (n int, err error)
+	Close() error
+}

internal/compressions/reader_brotli.go

@@ -0,0 +1,24 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package compressions
+
+import (
+	"github.com/andybalholm/brotli"
+	"io"
+)
+
+type BrotliReader struct {
+	reader *brotli.Reader
+}
+
+func NewBrotliReader(reader io.Reader) (Reader, error) {
+	return &BrotliReader{reader: brotli.NewReader(reader)}, nil
+}
+
+func (this *BrotliReader) Read(p []byte) (n int, err error) {
+	return this.reader.Read(p)
+}
+
+func (this *BrotliReader) Close() error {
+	return nil
+}

internal/compressions/reader_deflate.go

@@ -0,0 +1,24 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package compressions
+
+import (
+	"compress/flate"
+	"io"
+)
+
+type DeflateReader struct {
+	reader io.ReadCloser
+}
+
+func NewDeflateReader(reader io.Reader) (Reader, error) {
+	return &DeflateReader{reader: flate.NewReader(reader)}, nil
+}
+
+func (this *DeflateReader) Read(p []byte) (n int, err error) {
+	return this.reader.Read(p)
+}
+
+func (this *DeflateReader) Close() error {
+	return this.reader.Close()
+}

internal/compressions/reader_gzip.go

@@ -0,0 +1,30 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package compressions
+
+import (
+	"compress/gzip"
+	"io"
+)
+
+type GzipReader struct {
+	reader *gzip.Reader
+}
+
+func NewGzipReader(reader io.Reader) (Reader, error) {
+	r, err := gzip.NewReader(reader)
+	if err != nil {
+		return nil, err
+	}
+	return &GzipReader{
+		reader: r,
+	}, nil
+}
+
+func (this *GzipReader) Read(p []byte) (n int, err error) {
+	return this.reader.Read(p)
+}
+
+func (this *GzipReader) Close() error {
+	return this.reader.Close()
+}

internal/compressions/utils.go

@@ -8,6 +8,31 @@ import (
 	"io"
 )
 
+type ContentEncoding = string
+
+const (
+	ContentEncodingBr      ContentEncoding = "br"
+	ContentEncodingGzip    ContentEncoding = "gzip"
+	ContentEncodingDeflate ContentEncoding = "deflate"
+)
+
+var ErrNotSupportedContentEncoding = errors.New("not supported content encoding")
+
+// NewReader 获取Reader
+func NewReader(reader io.Reader, contentEncoding ContentEncoding) (Reader, error) {
+	switch contentEncoding {
+	case ContentEncodingBr:
+		return NewBrotliReader(reader)
+	case ContentEncodingGzip:
+		return NewGzipReader(reader)
+	case ContentEncodingDeflate:
+		return NewDeflateReader(reader)
+	}
+	return nil, ErrNotSupportedContentEncoding
+}
+
+// NewWriter 获取Writer
+// TODO 考虑重用Writer
 func NewWriter(writer io.Writer, compressType serverconfigs.HTTPCompressionType, level int) (Writer, error) {
 	switch compressType {
 	case serverconfigs.HTTPCompressionTypeGzip:

internal/compressions/writer_encoding.go

@@ -0,0 +1,51 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package compressions
+
+import (
+	"bytes"
+	"io"
+)
+
+type EncodingWriter struct {
+	contentEncoding ContentEncoding
+	writer          Writer
+	buf             *bytes.Buffer
+}
+
+func NewEncodingWriter(contentEncoding ContentEncoding, writer Writer) (Writer, error) {
+	return &EncodingWriter{
+		contentEncoding: contentEncoding,
+		writer:          writer,
+		buf:             &bytes.Buffer{},
+	}, nil
+}
+
+func (this *EncodingWriter) Write(p []byte) (int, error) {
+	return this.buf.Write(p)
+}
+
+func (this *EncodingWriter) Flush() error {
+	return this.writer.Flush()
+}
+
+func (this *EncodingWriter) Close() error {
+	reader, err := NewReader(this.buf, this.contentEncoding)
+	if err != nil {
+		_ = this.writer.Close()
+		return err
+	}
+	_, err = io.Copy(this.writer, reader)
+	if err != nil {
+		_ = reader.Close()
+		_ = this.writer.Close()
+		return err
+	}
+
+	_ = reader.Close()
+	return this.writer.Close()
+}
+
+func (this *EncodingWriter) Level() int {
+	return this.writer.Level()
+}

internal/compressions/writer_encoding_test.go

@@ -0,0 +1,47 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package compressions
+
+import (
+	"bytes"
+	"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
+	"testing"
+)
+
+func TestNewEncodingWriter(t *testing.T) {
+	var buf = &bytes.Buffer{}
+
+	subWriter, err := NewWriter(buf, serverconfigs.HTTPCompressionTypeGzip, 5)
+	if err != nil {
+		t.Fatal(err)
+	}
+	writer, err := NewEncodingWriter(ContentEncodingGzip, subWriter)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	gzipBuf := &bytes.Buffer{}
+	gzipWriter, err := NewGzipWriter(gzipBuf, 5)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = gzipWriter.Write([]byte("Hello"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = gzipWriter.Write([]byte("World"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = gzipWriter.Close()
+
+	_, err = writer.Write(gzipBuf.Bytes())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_ = writer.Close()
+
+	t.Log(buf.String())
+}

internal/nodes/http_writer.go

@@ -444,7 +444,8 @@ func (this *HTTPWriter) PrepareCompression(size int64) {
 	}
 
 	// 如果已经有编码则不处理
-	if len(this.writer.Header().Get("Content-Encoding")) > 0 {
+	var contentEncoding = this.writer.Header().Get("Content-Encoding")
+	if len(contentEncoding) > 0 && (!this.compressionConfig.DecompressData || !lists.ContainsString([]string{"gzip", "deflate", "br"}, contentEncoding)) {
 		return
 	}
 
@@ -458,6 +459,12 @@ func (this *HTTPWriter) PrepareCompression(size int64) {
 	if !ok {
 		return
 	}
+
+	// 压缩前后如果编码一致，则不处理
+	if compressionEncoding == contentEncoding {
+		return
+	}
+
 	this.compressionType = compressionType
 
 	// compression writer
@@ -468,6 +475,15 @@ func (this *HTTPWriter) PrepareCompression(size int64) {
 		return
 	}
 
+	// convert between encodings
+	if len(contentEncoding) > 0 {
+		this.compressionWriter, err = compressions.NewEncodingWriter(contentEncoding, this.compressionWriter)
+		if err != nil {
+			remotelogs.Error("HTTP_WRITER", err.Error())
+			return
+		}
+	}
+
 	// body copy
 	if this.bodyCopying {
 		this.compressionBodyBuffer = bytes.NewBuffer([]byte{})