mirror of
https://github.com/TeaOSLab/EdgeNode.git
synced 2025-11-04 07:40:56 +08:00
378 lines
8.5 KiB
Go
378 lines
8.5 KiB
Go
package nodes
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
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"github.com/TeaOSLab/EdgeNode/internal/caches"
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"github.com/TeaOSLab/EdgeNode/internal/logs"
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"github.com/TeaOSLab/EdgeNode/internal/utils"
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"github.com/iwind/TeaGo/lists"
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"net"
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"net/http"
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"strings"
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)
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// 响应Writer
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type HTTPWriter struct {
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req *HTTPRequest
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writer http.ResponseWriter
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gzipConfig *serverconfigs.HTTPGzipConfig
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gzipWriter *gzip.Writer
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statusCode int
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sentBodyBytes int64
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bodyCopying bool
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body []byte
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gzipBodyBuffer *bytes.Buffer // 当使用gzip压缩时使用
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gzipBodyWriter *gzip.Writer // 当使用gzip压缩时使用
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cacheWriter caches.Writer // 缓存写入
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cacheStorage caches.StorageInterface
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}
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// 包装对象
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func NewHTTPWriter(req *HTTPRequest, httpResponseWriter http.ResponseWriter) *HTTPWriter {
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return &HTTPWriter{
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req: req,
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writer: httpResponseWriter,
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}
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}
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// 重置
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func (this *HTTPWriter) Reset(httpResponseWriter http.ResponseWriter) {
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this.writer = httpResponseWriter
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this.gzipConfig = nil
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this.gzipWriter = nil
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this.statusCode = 0
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this.sentBodyBytes = 0
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this.bodyCopying = false
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this.body = nil
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this.gzipBodyBuffer = nil
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this.gzipBodyWriter = nil
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}
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// 设置Gzip
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func (this *HTTPWriter) Gzip(config *serverconfigs.HTTPGzipConfig) {
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this.gzipConfig = config
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}
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// 准备输出
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func (this *HTTPWriter) Prepare(size int64) {
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this.prepareGzip(size)
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this.prepareCache(size)
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}
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// 包装前的原始的Writer
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func (this *HTTPWriter) Raw() http.ResponseWriter {
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return this.writer
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}
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// 获取Header
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func (this *HTTPWriter) Header() http.Header {
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if this.writer == nil {
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return http.Header{}
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}
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return this.writer.Header()
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}
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// 添加一组Header
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func (this *HTTPWriter) AddHeaders(header http.Header) {
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if this.writer == nil {
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return
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}
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for key, value := range header {
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if key == "Connection" {
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continue
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}
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for _, v := range value {
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this.writer.Header().Add(key, v)
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}
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}
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}
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// 写入数据
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func (this *HTTPWriter) Write(data []byte) (n int, err error) {
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if this.writer != nil {
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if this.gzipWriter != nil {
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n, err = this.gzipWriter.Write(data)
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} else {
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n, err = this.writer.Write(data)
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}
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if n > 0 {
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this.sentBodyBytes += int64(n)
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}
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// 写入缓存
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if this.cacheWriter != nil {
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_, err = this.cacheWriter.Write(data)
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if err != nil {
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_ = this.cacheWriter.Discard()
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this.cacheWriter = nil
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logs.Error("REQUEST_WRITER", "write cache failed: "+err.Error())
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}
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}
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} else {
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if n == 0 {
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n = len(data) // 防止出现short write错误
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}
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}
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if this.bodyCopying {
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if this.gzipBodyWriter != nil {
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_, err := this.gzipBodyWriter.Write(data)
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if err != nil {
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logs.Error("REQUEST_WRITER", err.Error())
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}
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} else {
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this.body = append(this.body, data...)
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}
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}
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return
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}
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// 写入字符串
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func (this *HTTPWriter) WriteString(s string) (n int, err error) {
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return this.Write([]byte(s))
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}
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// 读取发送的字节数
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func (this *HTTPWriter) SentBodyBytes() int64 {
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return this.sentBodyBytes
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}
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// 写入状态码
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func (this *HTTPWriter) WriteHeader(statusCode int) {
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if this.writer != nil {
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this.writer.WriteHeader(statusCode)
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}
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this.statusCode = statusCode
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}
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// 读取状态码
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func (this *HTTPWriter) StatusCode() int {
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if this.statusCode == 0 {
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return http.StatusOK
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}
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return this.statusCode
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}
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// 设置拷贝Body数据
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func (this *HTTPWriter) SetBodyCopying(b bool) {
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this.bodyCopying = b
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}
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// 判断是否在拷贝Body数据
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func (this *HTTPWriter) BodyIsCopying() bool {
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return this.bodyCopying
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}
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// 读取拷贝的Body数据
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func (this *HTTPWriter) Body() []byte {
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return this.body
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}
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// 读取Header二进制数据
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func (this *HTTPWriter) HeaderData() []byte {
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if this.writer == nil {
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return nil
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}
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resp := &http.Response{}
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resp.Header = this.Header()
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if this.statusCode == 0 {
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this.statusCode = http.StatusOK
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}
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resp.StatusCode = this.statusCode
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resp.ProtoMajor = 1
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resp.ProtoMinor = 1
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resp.ContentLength = 1 // Trick：这样可以屏蔽Content-Length
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writer := bytes.NewBuffer([]byte{})
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_ = resp.Write(writer)
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return writer.Bytes()
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}
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// 关闭
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func (this *HTTPWriter) Close() {
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// gzip writer
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if this.gzipWriter != nil {
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if this.bodyCopying && this.gzipBodyWriter != nil {
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_ = this.gzipBodyWriter.Close()
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this.body = this.gzipBodyBuffer.Bytes()
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}
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_ = this.gzipWriter.Close()
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this.gzipWriter = nil
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}
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// cache writer
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if this.cacheWriter != nil {
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err := this.cacheWriter.Close()
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if err == nil {
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this.cacheStorage.AddToList(&caches.Item{
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Key: this.cacheWriter.Key(),
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ExpiredAt: this.cacheWriter.ExpiredAt(),
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ValueSize: this.cacheWriter.Size(),
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})
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}
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}
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}
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// Hijack
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func (this *HTTPWriter) Hijack() (conn net.Conn, buf *bufio.ReadWriter, err error) {
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hijack, ok := this.writer.(http.Hijacker)
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if ok {
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return hijack.Hijack()
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}
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return
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}
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// Flush
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func (this *HTTPWriter) Flush() {
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flusher, ok := this.writer.(http.Flusher)
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if ok {
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flusher.Flush()
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}
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}
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// 准备Gzip
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func (this *HTTPWriter) prepareGzip(size int64) {
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if this.gzipConfig == nil || this.gzipConfig.Level <= 0 {
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return
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}
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// 判断Accept是否支持gzip
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if !strings.Contains(this.req.requestHeader("Accept-Encoding"), "gzip") {
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return
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}
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// 尺寸和类型
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if size < this.gzipConfig.MinBytes() || (this.gzipConfig.MaxBytes() > 0 && size > this.gzipConfig.MaxBytes()) {
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return
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}
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// 校验其他条件
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if this.gzipConfig.Conds != nil {
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if len(this.gzipConfig.Conds.Groups) > 0 {
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if !this.gzipConfig.Conds.MatchRequest(this.req.Format) || !this.gzipConfig.Conds.MatchResponse(this.req.Format) {
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return
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}
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} else {
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// 默认校验文档类型
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contentType := this.writer.Header().Get("Content-Type")
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if len(contentType) > 0 && (!strings.HasPrefix(contentType, "text/") && !strings.HasPrefix(contentType, "application/")) {
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return
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}
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}
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}
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// 如果已经有编码则不处理
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if len(this.writer.Header().Get("Content-Encoding")) > 0 {
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return
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}
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// gzip writer
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var err error = nil
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this.gzipWriter, err = gzip.NewWriterLevel(this.writer, int(this.gzipConfig.Level))
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if err != nil {
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logs.Error("REQUEST_WRITER", err.Error())
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return
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}
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// body copy
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if this.bodyCopying {
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this.gzipBodyBuffer = bytes.NewBuffer([]byte{})
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this.gzipBodyWriter, err = gzip.NewWriterLevel(this.gzipBodyBuffer, int(this.gzipConfig.Level))
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if err != nil {
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logs.Error("REQUEST_WRITER", err.Error())
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}
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}
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header := this.writer.Header()
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header.Set("Content-Encoding", "gzip")
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header.Set("Transfer-Encoding", "chunked")
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header.Set("Vary", "Accept-Encoding")
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header.Del("Content-Length")
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}
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// 准备缓存
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func (this *HTTPWriter) prepareCache(size int64) {
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if this.writer == nil || size <= 0 {
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return
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}
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cacheRef := this.req.cacheRef
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if cacheRef == nil ||
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cacheRef.CachePolicy == nil ||
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!cacheRef.IsOn ||
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(cacheRef.MaxSizeBytes() > 0 && size > cacheRef.MaxSizeBytes()) ||
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(cacheRef.CachePolicy.MaxSizeBytes() > 0 && size > cacheRef.CachePolicy.MaxSizeBytes()) {
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return
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}
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// 检查状态
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if len(cacheRef.Status) > 0 && !lists.ContainsInt(cacheRef.Status, this.StatusCode()) {
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return
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}
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// Cache-Control
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if len(cacheRef.SkipResponseCacheControlValues) > 0 {
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cacheControl := this.writer.Header().Get("Cache-Control")
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if len(cacheControl) > 0 {
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values := strings.Split(cacheControl, ",")
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for _, value := range values {
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if cacheRef.ContainsCacheControl(strings.TrimSpace(value)) {
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return
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}
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}
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}
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}
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// Set-Cookie
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if cacheRef.SkipResponseSetCookie && len(this.writer.Header().Get("Set-Cookie")) > 0 {
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return
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}
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// 校验其他条件
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if cacheRef.Conds != nil && cacheRef.Conds.HasResponseConds() && !cacheRef.Conds.MatchResponse(this.req.Format) {
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return
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}
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// 打开缓存写入
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storage := caches.SharedManager.FindStorageWithPolicy(this.req.cacheRef.CachePolicyId)
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if storage == nil {
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return
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}
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this.cacheStorage = storage
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life := cacheRef.LifeSeconds()
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if life <= 60 { // 最小不能少于1分钟
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life = 60
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}
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expiredAt := utils.UnixTime() + life
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cacheWriter, err := storage.Open(this.req.cacheKey, expiredAt)
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if err != nil {
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logs.Error("REQUEST_WRITER", "write cache failed: "+err.Error())
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return
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}
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this.cacheWriter = cacheWriter
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if this.gzipWriter != nil {
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this.cacheWriter = caches.NewGzipWriter(this.cacheWriter, this.req.cacheKey, expiredAt)
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}
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// 写入Header
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headerData := this.HeaderData()
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_, err = cacheWriter.Write(headerData)
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if err != nil {
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logs.Error("REQUEST_WRITER", "write cache failed: "+err.Error())
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_ = this.cacheWriter.Discard()
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this.cacheWriter = nil
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return
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}
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}
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