add client and transport

http/transport.go

@@ -0,0 +1,115 @@
+package http
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+	"strings"
+)
+
+type HttpTransport struct{}
+
+func (t *HttpTransport) RoundTrip(req *Request) (*Response, error) {
+	conn, err := net.Dial("tcp", req.ConnectPath)
+	// conn, err := tls.Dial("tcp", connectPath, nil)
+	if err != nil {
+		return nil, errors.New("connect " + req.ConnectPath)
+	}
+	defer conn.Close()
+
+	debugWrap(conn, req, writeRequest)
+	return readResponse(conn)
+}
+
+func writeRequest(w io.Writer, req *Request) {
+	fmt.Fprintf(w, "%s %s %s\r\n", req.Method, req.Path, req.Protocol)
+
+	for _, header := range req.Headers {
+		fmt.Fprintf(w, "%s: %s\r\n", header.Name, header.Value)
+	}
+	fmt.Fprintf(w, "\r\n")
+
+	if len(req.Body) > 0 {
+		fmt.Fprintf(w, "%s\r\n", req.Body)
+	}
+}
+
+func debugWrap(w io.Writer, req *Request, f func(w io.Writer, req *Request)) {
+	buffer := &bytes.Buffer{}
+
+	f(buffer, req)
+
+	fmt.Println("----- Debug Info -----")
+	fmt.Println(buffer.String())
+	fmt.Println("----- Debug End Info -----")
+
+	w.Write(buffer.Bytes())
+}
+
+func readResponse(r io.Reader) (*Response, error) {
+	b := bufio.NewReader(r)
+
+	if _, err := b.ReadString(' '); err != nil {
+		return nil, errors.New("read httpVersion")
+	}
+	statusCodeStr, err := b.ReadString(' ')
+	if err != nil {
+		return nil, errors.New("read statusCode")
+	}
+	if _, err := b.ReadString('\r'); err != nil {
+		return nil, errors.New("read statusName")
+	}
+	if _, err := b.ReadString('\n'); err != nil {
+		return nil, errors.New("read LF")
+	}
+
+	statusCode, err := strconv.Atoi(statusCodeStr[:len(statusCodeStr)-1])
+	if err != nil {
+		return nil, errors.New("read statusCode")
+	}
+
+	headerStr := ""
+	contentLengthStr := ""
+	headers := []Header{}
+	for {
+		headerStr, err = b.ReadString('\n')
+		if err != nil {
+			return nil, errors.New("read header")
+		}
+		if headerStr == "\r\n" {
+			break
+		}
+		arr := strings.Split(headerStr, ": ")
+		value := strings.TrimSpace(arr[1])
+		header := Header{Name: arr[0], Value: value}
+		if header.Name == "Content-Length" {
+			contentLengthStr = header.Value
+		}
+		headers = append(headers, header)
+	}
+
+	length, err := strconv.Atoi(contentLengthStr)
+	if err != nil {
+		return nil, errors.New("read Content-Length")
+	}
+
+	body := make([]byte, 0, length)
+
+	for i := 0; i < length; i++ {
+		r, err := b.ReadByte()
+		if err != nil {
+			return nil, errors.New("read body")
+		}
+		body = append(body, r)
+	}
+
+	return &Response{
+		StatusCode: statusCode,
+		Headers:    headers,
+		Body:       body,
+	}, nil
+}