116 lines
2.4 KiB
Go
116 lines
2.4 KiB
Go
package http
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import (
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"bufio"
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"bytes"
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"errors"
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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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)
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type HttpTransport struct{}
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func (t *HttpTransport) RoundTrip(req *Request) (*Response, error) {
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conn, err := net.Dial("tcp", req.ConnectPath)
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// conn, err := tls.Dial("tcp", connectPath, nil)
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if err != nil {
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return nil, errors.New("connect " + req.ConnectPath)
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}
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defer conn.Close()
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debugWrap(conn, req, writeRequest)
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return readResponse(conn)
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}
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func writeRequest(w io.Writer, req *Request) {
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fmt.Fprintf(w, "%s %s %s\r\n", req.Method, req.Path, req.Protocol)
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for _, header := range req.Headers {
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fmt.Fprintf(w, "%s: %s\r\n", header.Name, header.Value)
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}
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fmt.Fprintf(w, "\r\n")
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if len(req.Body) > 0 {
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fmt.Fprintf(w, "%s\r\n", req.Body)
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}
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}
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func debugWrap(w io.Writer, req *Request, f func(w io.Writer, req *Request)) {
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buffer := &bytes.Buffer{}
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f(buffer, req)
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fmt.Println("----- Debug Info -----")
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fmt.Println(buffer.String())
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fmt.Println("----- Debug End Info -----")
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w.Write(buffer.Bytes())
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}
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func readResponse(r io.Reader) (*Response, error) {
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b := bufio.NewReader(r)
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if _, err := b.ReadString(' '); err != nil {
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return nil, errors.New("read httpVersion")
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}
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statusCodeStr, err := b.ReadString(' ')
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if err != nil {
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return nil, errors.New("read statusCode")
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}
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if _, err := b.ReadString('\r'); err != nil {
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return nil, errors.New("read statusName")
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}
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if _, err := b.ReadString('\n'); err != nil {
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return nil, errors.New("read LF")
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}
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statusCode, err := strconv.Atoi(statusCodeStr[:len(statusCodeStr)-1])
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if err != nil {
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return nil, errors.New("read statusCode")
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}
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headerStr := ""
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contentLengthStr := ""
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headers := []Header{}
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for {
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headerStr, err = b.ReadString('\n')
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if err != nil {
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return nil, errors.New("read header")
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}
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if headerStr == "\r\n" {
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break
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}
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arr := strings.Split(headerStr, ": ")
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value := strings.TrimSpace(arr[1])
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header := Header{Name: arr[0], Value: value}
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if header.Name == "Content-Length" {
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contentLengthStr = header.Value
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}
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headers = append(headers, header)
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}
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length, err := strconv.Atoi(contentLengthStr)
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if err != nil {
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return nil, errors.New("read Content-Length")
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}
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body := make([]byte, 0, length)
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for i := 0; i < length; i++ {
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r, err := b.ReadByte()
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if err != nil {
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return nil, errors.New("read body")
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}
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body = append(body, r)
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}
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return &Response{
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StatusCode: statusCode,
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Headers: headers,
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Body: body,
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}, nil
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}
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