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1802 changed files with 503346 additions and 2 deletions
296
backend/internal/httpwire/ordered_conn.go
Normal file
296
backend/internal/httpwire/ordered_conn.go
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// Package httpwire contains narrowly scoped HTTP/1.1 wire helpers.
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package httpwire
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import (
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"bytes"
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"fmt"
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"io"
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"net"
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"strconv"
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"strings"
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"sync"
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)
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const maxBufferedRequestHeader = 1 << 20
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// RequestHeaderOrder returns the desired header-name order for one HTTP/1.1
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// request. Names are compared case-insensitively. Headers omitted from the
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// returned list retain their original relative order after the listed headers.
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type RequestHeaderOrder func(method, requestTarget string) []string
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// NewOrderedRequestConn wraps conn and rewrites only HTTP/1.1 request-header
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// order. Request lines, header casing and values, and body bytes remain intact.
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func NewOrderedRequestConn(conn net.Conn, order RequestHeaderOrder) net.Conn {
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if conn == nil || order == nil {
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return conn
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}
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return &orderedRequestConn{Conn: conn, order: order}
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}
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type orderedRequestConn struct {
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net.Conn
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order RequestHeaderOrder
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mu sync.Mutex
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header []byte
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bodyRemaining int64
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chunked *chunkedRequestTracker
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}
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func (c *orderedRequestConn) Write(p []byte) (int, error) {
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c.mu.Lock()
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defer c.mu.Unlock()
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originalLength := len(p)
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consumed := 0
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remaining := p
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for len(remaining) > 0 {
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if c.bodyRemaining > 0 {
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bodyBytes := min(int64(len(remaining)), c.bodyRemaining)
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written, errWrite := writeAll(c.Conn, remaining[:bodyBytes])
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consumed += written
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c.bodyRemaining -= int64(written)
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if errWrite != nil {
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return consumed, errWrite
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}
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remaining = remaining[bodyBytes:]
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continue
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}
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if c.chunked != nil {
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preview := c.chunked.clone()
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chunkBytes, _, errChunk := preview.consume(remaining)
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if errChunk != nil {
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return consumed, errChunk
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}
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written, errWrite := writeAll(c.Conn, remaining[:chunkBytes])
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consumed += written
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_, completed, errConsume := c.chunked.consume(remaining[:written])
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if errConsume != nil {
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return consumed, errConsume
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}
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if completed {
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c.chunked = nil
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}
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if errWrite != nil {
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return consumed, errWrite
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}
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remaining = remaining[chunkBytes:]
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continue
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}
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previousHeaderLength := len(c.header)
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c.header = append(c.header, remaining...)
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headerEnd := bytes.Index(c.header, []byte("\r\n\r\n"))
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if headerEnd < 0 {
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if len(c.header) > maxBufferedRequestHeader {
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return consumed, fmt.Errorf("httpwire: request header exceeds %d bytes", maxBufferedRequestHeader)
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}
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return originalLength, nil
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}
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headerEnd += len("\r\n\r\n")
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header := c.header[:headerEnd]
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body := c.header[headerEnd:]
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c.header = nil
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currentHeaderBytes := min(len(remaining), max(0, headerEnd-previousHeaderLength))
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ordered, contentLength, chunked := orderRequestHeader(header, c.order)
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if _, errWrite := writeAll(c.Conn, ordered); errWrite != nil {
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// All caller bytes were accepted into the wrapper before the transformed
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// header write failed. Return the full input count with the terminal
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// connection error so callers do not replay an ambiguous partial header.
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return originalLength, errWrite
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}
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consumed += currentHeaderBytes
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remaining = body
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if chunked {
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c.chunked = newChunkedRequestTracker()
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continue
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}
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c.bodyRemaining = contentLength
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}
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return originalLength, nil
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}
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func orderRequestHeader(header []byte, order RequestHeaderOrder) ([]byte, int64, bool) {
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lines := bytes.Split(header[:len(header)-len("\r\n\r\n")], []byte("\r\n"))
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if len(lines) == 0 {
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return header, 0, false
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}
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requestParts := strings.SplitN(string(lines[0]), " ", 3)
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if len(requestParts) != 3 {
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return header, requestContentLength(lines[1:]), requestUsesChunkedEncoding(lines[1:])
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}
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desired := order(requestParts[0], requestParts[1])
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if len(desired) == 0 {
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return header, requestContentLength(lines[1:]), requestUsesChunkedEncoding(lines[1:])
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}
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headerLines := lines[1:]
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used := make([]bool, len(headerLines))
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orderedLines := make([][]byte, 0, len(lines))
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orderedLines = append(orderedLines, lines[0])
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for _, name := range desired {
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for index, line := range headerLines {
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if used[index] || !headerLineNamed(line, name) {
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continue
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}
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orderedLines = append(orderedLines, line)
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used[index] = true
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}
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}
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for index, line := range headerLines {
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if !used[index] {
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orderedLines = append(orderedLines, line)
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}
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}
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var output bytes.Buffer
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for _, line := range orderedLines {
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output.Write(line)
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output.WriteString("\r\n")
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}
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output.WriteString("\r\n")
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return output.Bytes(), requestContentLength(headerLines), requestUsesChunkedEncoding(headerLines)
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}
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func headerLineNamed(line []byte, name string) bool {
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colon := bytes.IndexByte(line, ':')
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return colon > 0 && strings.EqualFold(string(line[:colon]), name)
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}
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func requestContentLength(lines [][]byte) int64 {
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for _, line := range lines {
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if !headerLineNamed(line, "Content-Length") {
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continue
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}
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colon := bytes.IndexByte(line, ':')
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value := strings.TrimSpace(string(line[colon+1:]))
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length, errParse := strconv.ParseInt(value, 10, 64)
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if errParse == nil && length > 0 {
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return length
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}
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return 0
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}
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return 0
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}
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func requestUsesChunkedEncoding(lines [][]byte) bool {
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for _, line := range lines {
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if !headerLineNamed(line, "Transfer-Encoding") {
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continue
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}
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colon := bytes.IndexByte(line, ':')
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for _, encoding := range strings.Split(string(line[colon+1:]), ",") {
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if strings.EqualFold(strings.TrimSpace(encoding), "chunked") {
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return true
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}
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}
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}
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return false
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}
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type chunkedRequestTracker struct {
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state uint8
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line []byte
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dataRemaining int64
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crlfPosition int
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trailers []byte
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}
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const (
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chunkedReadingSize uint8 = iota
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chunkedReadingData
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chunkedReadingDataCRLF
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chunkedReadingTrailers
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)
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func newChunkedRequestTracker() *chunkedRequestTracker {
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return &chunkedRequestTracker{state: chunkedReadingSize}
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}
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func (tracker *chunkedRequestTracker) clone() *chunkedRequestTracker {
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cloned := *tracker
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cloned.line = append([]byte(nil), tracker.line...)
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cloned.trailers = append([]byte(nil), tracker.trailers...)
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return &cloned
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}
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func (tracker *chunkedRequestTracker) consume(data []byte) (consumed int, completed bool, err error) {
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for consumed < len(data) {
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switch tracker.state {
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case chunkedReadingSize:
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tracker.line = append(tracker.line, data[consumed])
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consumed++
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if len(tracker.line) > maxBufferedRequestHeader {
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return consumed, false, fmt.Errorf("httpwire: chunk size line exceeds %d bytes", maxBufferedRequestHeader)
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}
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if len(tracker.line) < 2 || !bytes.Equal(tracker.line[len(tracker.line)-2:], []byte("\r\n")) {
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continue
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}
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sizeText := strings.TrimSpace(string(tracker.line[:len(tracker.line)-2]))
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if extension := strings.IndexByte(sizeText, ';'); extension >= 0 {
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sizeText = strings.TrimSpace(sizeText[:extension])
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}
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size, errParse := strconv.ParseInt(sizeText, 16, 64)
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if errParse != nil || size < 0 {
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return consumed, false, fmt.Errorf("httpwire: invalid chunk size %q", sizeText)
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}
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tracker.line = tracker.line[:0]
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if size == 0 {
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tracker.state = chunkedReadingTrailers
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continue
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}
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tracker.dataRemaining = size
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tracker.state = chunkedReadingData
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case chunkedReadingData:
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chunkBytes := min(int64(len(data)-consumed), tracker.dataRemaining)
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consumed += int(chunkBytes)
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tracker.dataRemaining -= chunkBytes
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if tracker.dataRemaining == 0 {
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tracker.crlfPosition = 0
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tracker.state = chunkedReadingDataCRLF
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}
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case chunkedReadingDataCRLF:
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want := []byte("\r\n")
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if data[consumed] != want[tracker.crlfPosition] {
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return consumed, false, fmt.Errorf("httpwire: chunk data is missing CRLF terminator")
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}
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consumed++
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tracker.crlfPosition++
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if tracker.crlfPosition == len(want) {
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tracker.state = chunkedReadingSize
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}
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case chunkedReadingTrailers:
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tracker.trailers = append(tracker.trailers, data[consumed])
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consumed++
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if len(tracker.trailers) > maxBufferedRequestHeader {
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return consumed, false, fmt.Errorf("httpwire: chunk trailers exceed %d bytes", maxBufferedRequestHeader)
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}
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if bytes.Equal(tracker.trailers, []byte("\r\n")) ||
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(len(tracker.trailers) >= 4 && bytes.Equal(tracker.trailers[len(tracker.trailers)-4:], []byte("\r\n\r\n"))) {
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return consumed, true, nil
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}
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default:
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return consumed, false, fmt.Errorf("httpwire: invalid chunk parser state %d", tracker.state)
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}
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}
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return consumed, false, nil
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}
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func writeAll(writer io.Writer, data []byte) (int, error) {
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total := 0
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for len(data) > 0 {
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written, errWrite := writer.Write(data)
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total += written
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if errWrite != nil {
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return total, errWrite
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}
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if written <= 0 {
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return total, io.ErrShortWrite
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}
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data = data[written:]
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}
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return total, nil
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}
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200
backend/internal/httpwire/ordered_conn_test.go
Normal file
200
backend/internal/httpwire/ordered_conn_test.go
Normal file
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@ -0,0 +1,200 @@
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package httpwire
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import (
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"bytes"
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"errors"
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"io"
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"net"
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"testing"
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"time"
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)
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func TestOrderedRequestConnReordersKeepAliveRequestsWithoutChangingBodies(t *testing.T) {
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t.Parallel()
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client, server := net.Pipe()
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t.Cleanup(func() {
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if errClose := client.Close(); errClose != nil && !errors.Is(errClose, net.ErrClosed) {
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t.Errorf("close client connection: %v", errClose)
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}
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if errClose := server.Close(); errClose != nil && !errors.Is(errClose, net.ErrClosed) {
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t.Errorf("close server connection: %v", errClose)
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}
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})
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conn := NewOrderedRequestConn(client, func(method, target string) []string {
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if method == "POST" && target == "/v1/messages?beta=true" {
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return []string{"Accept", "Authorization", "Content-Type", "User-Agent", "Connection", "Host", "Accept-Encoding", "Content-Length"}
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}
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return []string{"Accept", "Host", "Connection"}
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})
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firstInput := "POST /v1/messages?beta=true HTTP/1.1\r\nHost: api.anthropic.com\r\nUser-Agent: claude-cli/2.1.220 (external, cli)\r\nContent-Length: 7\r\nAccept: application/json\r\nX-Unknown: keep\r\nAuthorization: Bearer placeholder\r\nContent-Type: application/json\r\nConnection: keep-alive\r\nAccept-Encoding: gzip, deflate, br, zstd\r\n\r\n{\"a\":1}"
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secondInput := "GET /api/oauth/profile HTTP/1.1\r\nConnection: close\r\nHost: api.anthropic.com\r\nAccept: application/json\r\n\r\n"
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want := "POST /v1/messages?beta=true HTTP/1.1\r\nAccept: application/json\r\nAuthorization: Bearer placeholder\r\nContent-Type: application/json\r\nUser-Agent: claude-cli/2.1.220 (external, cli)\r\nConnection: keep-alive\r\nHost: api.anthropic.com\r\nAccept-Encoding: gzip, deflate, br, zstd\r\nContent-Length: 7\r\nX-Unknown: keep\r\n\r\n{\"a\":1}GET /api/oauth/profile HTTP/1.1\r\nAccept: application/json\r\nHost: api.anthropic.com\r\nConnection: close\r\n\r\n"
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readDone := make(chan []byte, 1)
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go func() {
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if errDeadline := server.SetReadDeadline(time.Now().Add(5 * time.Second)); errDeadline != nil {
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readDone <- nil
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return
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}
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got := make([]byte, len(want))
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if _, errRead := io.ReadFull(server, got); errRead != nil {
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readDone <- nil
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return
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}
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readDone <- got
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}()
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parts := [][]byte{
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[]byte(firstInput[:29]),
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[]byte(firstInput[29 : len(firstInput)-3]),
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[]byte(firstInput[len(firstInput)-3:] + secondInput[:17]),
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[]byte(secondInput[17:]),
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}
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for _, part := range parts {
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written, errWrite := conn.Write(part)
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if errWrite != nil {
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t.Fatalf("write request bytes: %v", errWrite)
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}
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if written != len(part) {
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t.Fatalf("write length = %d, want %d", written, len(part))
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}
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}
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select {
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case got := <-readDone:
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if !bytes.Equal(got, []byte(want)) {
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t.Fatalf("wire bytes differ\n got: %q\nwant: %q", got, want)
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}
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case <-time.After(5 * time.Second):
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t.Fatal("timed out reading ordered request bytes")
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}
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}
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func TestOrderedRequestConnPreservesChunkedBodyAndReordersNextRequest(t *testing.T) {
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t.Parallel()
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client, server := net.Pipe()
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t.Cleanup(func() {
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_ = client.Close()
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_ = server.Close()
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})
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conn := NewOrderedRequestConn(client, func(_, _ string) []string { return []string{"Host", "Transfer-Encoding"} })
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first := "POST /upload HTTP/1.1\r\nTransfer-Encoding: chunked\r\nHost: example.com\r\n\r\n4\r\ntest\r\n0\r\nX-Trailer: done\r\n\r\n"
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second := "GET /next HTTP/1.1\r\nTransfer-Encoding: identity\r\nHost: example.com\r\n\r\n"
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input := []byte(first + second)
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want := []byte("POST /upload HTTP/1.1\r\nHost: example.com\r\nTransfer-Encoding: chunked\r\n\r\n4\r\ntest\r\n0\r\nX-Trailer: done\r\n\r\nGET /next HTTP/1.1\r\nHost: example.com\r\nTransfer-Encoding: identity\r\n\r\n")
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|
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readDone := make(chan []byte, 1)
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go func() {
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got := make([]byte, len(want))
|
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_, _ = io.ReadFull(server, got)
|
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readDone <- got
|
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}()
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for index := range input {
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part := input[index : index+1]
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written, errWrite := conn.Write(part)
|
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if errWrite != nil {
|
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t.Fatal(errWrite)
|
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}
|
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if written != len(part) {
|
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t.Fatalf("write length = %d, want %d", written, len(part))
|
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}
|
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}
|
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if got := <-readDone; !bytes.Equal(got, want) {
|
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t.Fatalf("chunked wire bytes differ\n got: %q\nwant: %q", got, want)
|
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}
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}
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|
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type partialErrorConn struct {
|
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bytes.Buffer
|
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failLimit int
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failErr error
|
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}
|
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|
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func (conn *partialErrorConn) Write(data []byte) (int, error) {
|
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if conn.failErr == nil {
|
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return conn.Buffer.Write(data)
|
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}
|
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written := min(conn.failLimit, len(data))
|
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_, _ = conn.Buffer.Write(data[:written])
|
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return written, conn.failErr
|
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}
|
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|
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func (*partialErrorConn) Read([]byte) (int, error) { return 0, io.EOF }
|
||||
func (*partialErrorConn) Close() error { return nil }
|
||||
func (*partialErrorConn) LocalAddr() net.Addr { return nil }
|
||||
func (*partialErrorConn) RemoteAddr() net.Addr { return nil }
|
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func (*partialErrorConn) SetDeadline(time.Time) error { return nil }
|
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func (*partialErrorConn) SetReadDeadline(time.Time) error { return nil }
|
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func (*partialErrorConn) SetWriteDeadline(time.Time) error { return nil }
|
||||
|
||||
func TestOrderedRequestConnReportsPartialBodyWrite(t *testing.T) {
|
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underlying := &partialErrorConn{}
|
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conn := NewOrderedRequestConn(underlying, func(_, _ string) []string { return []string{"Host", "Content-Length"} })
|
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header := []byte("POST /upload HTTP/1.1\r\nContent-Length: 5\r\nHost: example.com\r\n\r\n")
|
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if written, errWrite := conn.Write(header); errWrite != nil || written != len(header) {
|
||||
t.Fatalf("header write = %d, %v", written, errWrite)
|
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}
|
||||
|
||||
underlying.failLimit = 2
|
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injectedErr := errors.New("injected partial write")
|
||||
underlying.failErr = injectedErr
|
||||
written, errWrite := conn.Write([]byte("hello"))
|
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if !errors.Is(errWrite, injectedErr) {
|
||||
t.Fatalf("body write error = %v, want injected error", errWrite)
|
||||
}
|
||||
if written != 2 {
|
||||
t.Fatalf("body write length = %d, want underlying partial count 2", written)
|
||||
}
|
||||
if remaining := conn.(*orderedRequestConn).bodyRemaining; remaining != 3 {
|
||||
t.Fatalf("bodyRemaining = %d, want 3 after confirmed partial write", remaining)
|
||||
}
|
||||
|
||||
underlying.failErr = nil
|
||||
if written, errWrite = conn.Write([]byte("llo")); errWrite != nil || written != 3 {
|
||||
t.Fatalf("retried body write = %d, %v", written, errWrite)
|
||||
}
|
||||
second := []byte("GET /next HTTP/1.1\r\nContent-Length: 0\r\nHost: example.com\r\n\r\n")
|
||||
if written, errWrite = conn.Write(second); errWrite != nil || written != len(second) {
|
||||
t.Fatalf("next request write = %d, %v", written, errWrite)
|
||||
}
|
||||
want := "POST /upload HTTP/1.1\r\nHost: example.com\r\nContent-Length: 5\r\n\r\nhelloGET /next HTTP/1.1\r\nHost: example.com\r\nContent-Length: 0\r\n\r\n"
|
||||
if got := underlying.String(); got != want {
|
||||
t.Fatalf("wire bytes differ after retry\n got: %q\nwant: %q", got, want)
|
||||
}
|
||||
}
|
||||
|
||||
func TestOrderedRequestConnTracksOnlyWrittenChunkBytesAfterPartialError(t *testing.T) {
|
||||
underlying := &partialErrorConn{}
|
||||
conn := NewOrderedRequestConn(underlying, func(_, _ string) []string { return []string{"Host", "Transfer-Encoding"} })
|
||||
header := []byte("POST /upload HTTP/1.1\r\nTransfer-Encoding: chunked\r\nHost: example.com\r\n\r\n")
|
||||
if written, errWrite := conn.Write(header); errWrite != nil || written != len(header) {
|
||||
t.Fatalf("header write = %d, %v", written, errWrite)
|
||||
}
|
||||
|
||||
chunkedBody := []byte("4\r\ntest\r\n0\r\nX-Trailer: done\r\n\r\n")
|
||||
underlying.failLimit = 6
|
||||
injectedErr := errors.New("injected chunk partial write")
|
||||
underlying.failErr = injectedErr
|
||||
written, errWrite := conn.Write(chunkedBody)
|
||||
if !errors.Is(errWrite, injectedErr) || written != 6 {
|
||||
t.Fatalf("chunk write = %d, %v; want 6 and injected error", written, errWrite)
|
||||
}
|
||||
|
||||
underlying.failErr = nil
|
||||
if retried, errRetry := conn.Write(chunkedBody[written:]); errRetry != nil || retried != len(chunkedBody)-written {
|
||||
t.Fatalf("retried chunk write = %d, %v", retried, errRetry)
|
||||
}
|
||||
second := []byte("GET /next HTTP/1.1\r\nTransfer-Encoding: identity\r\nHost: example.com\r\n\r\n")
|
||||
if written, errWrite = conn.Write(second); errWrite != nil || written != len(second) {
|
||||
t.Fatalf("next request write = %d, %v", written, errWrite)
|
||||
}
|
||||
want := "POST /upload HTTP/1.1\r\nHost: example.com\r\nTransfer-Encoding: chunked\r\n\r\n" + string(chunkedBody) +
|
||||
"GET /next HTTP/1.1\r\nHost: example.com\r\nTransfer-Encoding: identity\r\n\r\n"
|
||||
if got := underlying.String(); got != want {
|
||||
t.Fatalf("wire bytes differ after chunk retry\n got: %q\nwant: %q", got, want)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue