micro/transport/http_transport.go

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package transport
import (
"bufio"
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"bytes"
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"errors"
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"io"
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"io/ioutil"
"net"
"net/http"
"net/url"
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"sync"
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)
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type buffer struct {
io.ReadWriter
}
type httpTransport struct{}
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type httpTransportClient struct {
ht *httpTransport
addr string
conn net.Conn
dialOpts dialOptions
r chan *http.Request
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once sync.Once
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sync.Mutex
buff *bufio.Reader
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}
type httpTransportSocket struct {
r *http.Request
conn net.Conn
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}
type httpTransportListener struct {
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listener net.Listener
}
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func (b *buffer) Close() error {
return nil
}
func (h *httpTransportClient) Send(m *Message) error {
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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,
}
req := &http.Request{
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Method: "POST",
URL: &url.URL{
Scheme: "http",
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Host: h.addr,
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},
Header: header,
Body: buf,
ContentLength: int64(reqB.Len()),
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Host: h.addr,
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}
h.r <- req
return req.Write(h.conn)
}
func (h *httpTransportClient) Recv(m *Message) error {
var r *http.Request
if !h.dialOpts.stream {
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rc, ok := <-h.r
if !ok {
return io.EOF
}
r = rc
}
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h.Lock()
defer h.Unlock()
if h.buff == nil {
return io.EOF
}
rsp, err := http.ReadResponse(h.buff, r)
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if err != nil {
return err
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}
defer rsp.Body.Close()
b, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return err
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}
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] = ""
}
}
*m = *mr
return nil
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}
func (h *httpTransportClient) Close() error {
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err := h.conn.Close()
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h.once.Do(func() {
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h.Lock()
h.buff.Reset(nil)
h.buff = nil
h.Unlock()
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close(h.r)
})
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return err
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}
func (h *httpTransportSocket) Recv(m *Message) error {
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if m == nil {
return errors.New("message passed in is nil")
}
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b, err := ioutil.ReadAll(h.r.Body)
if err != nil {
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return err
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}
h.r.Body.Close()
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mr := &Message{
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Header: make(map[string]string),
Body: b,
}
for k, v := range h.r.Header {
if len(v) > 0 {
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mr.Header[k] = v[0]
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} else {
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mr.Header[k] = ""
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}
}
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*m = *mr
return nil
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}
func (h *httpTransportSocket) Send(m *Message) error {
b := bytes.NewBuffer(m.Body)
defer b.Reset()
rsp := &http.Response{
Header: h.r.Header,
Body: &buffer{b},
Status: "200 OK",
StatusCode: 200,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
ContentLength: int64(len(m.Body)),
}
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for k, v := range m.Header {
rsp.Header.Set(k, v)
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}
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return rsp.Write(h.conn)
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}
func (h *httpTransportSocket) error(m *Message) error {
b := bytes.NewBuffer(m.Body)
defer b.Reset()
rsp := &http.Response{
Header: make(http.Header),
Body: &buffer{b},
Status: "500 Internal Server Error",
StatusCode: 500,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
ContentLength: int64(len(m.Body)),
}
for k, v := range m.Header {
rsp.Header.Set(k, v)
}
return rsp.Write(h.conn)
}
func (h *httpTransportSocket) Close() error {
return h.conn.Close()
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}
func (h *httpTransportListener) Addr() string {
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return h.listener.Addr().String()
}
func (h *httpTransportListener) Close() error {
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return h.listener.Close()
}
func (h *httpTransportListener) Accept(fn func(Socket)) error {
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srv := &http.Server{
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
conn, _, err := w.(http.Hijacker).Hijack()
if err != nil {
return
}
sock := &httpTransportSocket{
conn: conn,
r: r,
}
// TODO: think of a better error response strategy
defer func() {
if r := recover(); r != nil {
sock.Close()
}
}()
fn(sock)
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}),
}
return srv.Serve(h.listener)
}
func (h *httpTransport) Dial(addr string, opts ...DialOption) (Client, error) {
conn, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
var dopts dialOptions
for _, opt := range opts {
opt(&dopts)
}
return &httpTransportClient{
ht: h,
addr: addr,
conn: conn,
buff: bufio.NewReader(conn),
dialOpts: dopts,
r: make(chan *http.Request, 1),
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}, nil
}
func (h *httpTransport) Listen(addr string) (Listener, error) {
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l, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
return &httpTransportListener{
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listener: l,
}, nil
}
func newHttpTransport(addrs []string, opt ...Option) *httpTransport {
return &httpTransport{}
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}