micro/transport/http_transport.go
2015-05-23 11:53:40 +01:00

180 lines
2.9 KiB
Go

package transport
import (
"bytes"
"errors"
"io/ioutil"
"net"
"net/http"
"net/url"
)
type headerRoundTripper struct {
r http.RoundTripper
}
type HttpTransport struct {
client *http.Client
}
type HttpTransportClient struct {
ht *HttpTransport
addr string
}
type HttpTransportSocket struct {
r *http.Request
w http.ResponseWriter
}
type HttpTransportListener struct {
listener net.Listener
}
func (t *headerRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
r.Header.Set("X-Client-Version", "1.0")
return t.r.RoundTrip(r)
}
func (h *HttpTransportClient) Send(m *Message) (*Message, error) {
header := make(http.Header)
for k, v := range m.Header {
header.Set(k, v)
}
reqB := bytes.NewBuffer(m.Body)
defer reqB.Reset()
buf := &buffer{
reqB,
}
hreq := &http.Request{
Method: "POST",
URL: &url.URL{
Scheme: "http",
Host: h.addr,
},
Header: header,
Body: buf,
ContentLength: int64(reqB.Len()),
Host: h.addr,
}
rsp, err := h.ht.client.Do(hreq)
if err != nil {
return nil, err
}
defer rsp.Body.Close()
b, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return nil, err
}
mr := &Message{
Header: make(map[string]string),
Body: b,
}
for k, v := range rsp.Header {
if len(v) > 0 {
mr.Header[k] = v[0]
} else {
mr.Header[k] = ""
}
}
return mr, nil
}
func (h *HttpTransportClient) Close() error {
return nil
}
func (h *HttpTransportSocket) Recv(m *Message) error {
if m == nil {
return errors.New("message passed in is nil")
}
b, err := ioutil.ReadAll(h.r.Body)
if err != nil {
return err
}
mr := &Message{
Header: make(map[string]string),
Body: b,
}
for k, v := range h.r.Header {
if len(v) > 0 {
mr.Header[k] = v[0]
} else {
mr.Header[k] = ""
}
}
*m = *mr
return nil
}
func (h *HttpTransportSocket) Send(m *Message) error {
for k, v := range m.Header {
h.w.Header().Set(k, v)
}
_, err := h.w.Write(m.Body)
return err
}
func (h *HttpTransportSocket) Close() error {
return nil
}
func (h *HttpTransportListener) Addr() string {
return h.listener.Addr().String()
}
func (h *HttpTransportListener) Close() error {
return h.listener.Close()
}
func (h *HttpTransportListener) Accept(fn func(Socket)) error {
srv := &http.Server{
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fn(&HttpTransportSocket{
r: r,
w: w,
})
}),
}
return srv.Serve(h.listener)
}
func (h *HttpTransport) Dial(addr string) (Client, error) {
return &HttpTransportClient{
ht: h,
addr: addr,
}, nil
}
func (h *HttpTransport) Listen(addr string) (Listener, error) {
l, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
return &HttpTransportListener{
listener: l,
}, nil
}
func NewHttpTransport(addrs []string) *HttpTransport {
client := &http.Client{}
client.Transport = &headerRoundTripper{http.DefaultTransport}
return &HttpTransport{client: client}
}