micro/transport/http_transport.go
2019-08-26 12:33:59 +01:00

593 lines
11 KiB
Go

package transport
import (
"bufio"
"bytes"
"crypto/tls"
"errors"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"sync"
"time"
maddr "github.com/micro/go-micro/util/addr"
"github.com/micro/go-micro/util/buf"
mnet "github.com/micro/go-micro/util/net"
mls "github.com/micro/go-micro/util/tls"
"golang.org/x/net/http2"
"golang.org/x/net/http2/h2c"
)
type httpTransport struct {
opts Options
}
type httpTransportClient struct {
ht *httpTransport
addr string
conn net.Conn
dialOpts DialOptions
once sync.Once
sync.RWMutex
// request must be stored for response processing
r chan *http.Request
bl []*http.Request
buff *bufio.Reader
// local/remote ip
local string
remote string
}
type httpTransportSocket struct {
ht *httpTransport
w http.ResponseWriter
r *http.Request
rw *bufio.ReadWriter
mtx sync.RWMutex
// the hijacked when using http 1
conn net.Conn
// for the first request
ch chan *http.Request
// h2 things
buf *bufio.Reader
// indicate if socket is closed
closed chan bool
// local/remote ip
local string
remote string
}
type httpTransportListener struct {
ht *httpTransport
listener net.Listener
}
func (h *httpTransportClient) Local() string {
return h.local
}
func (h *httpTransportClient) Remote() string {
return h.remote
}
func (h *httpTransportClient) Send(m *Message) error {
header := make(http.Header)
for k, v := range m.Header {
header.Set(k, v)
}
b := buf.New(bytes.NewBuffer(m.Body))
defer b.Close()
req := &http.Request{
Method: "POST",
URL: &url.URL{
Scheme: "http",
Host: h.addr,
},
Header: header,
Body: b,
ContentLength: int64(b.Len()),
Host: h.addr,
}
h.Lock()
h.bl = append(h.bl, req)
select {
case h.r <- h.bl[0]:
h.bl = h.bl[1:]
default:
}
h.Unlock()
// set timeout if its greater than 0
if h.ht.opts.Timeout > time.Duration(0) {
h.conn.SetDeadline(time.Now().Add(h.ht.opts.Timeout))
}
return req.Write(h.conn)
}
func (h *httpTransportClient) Recv(m *Message) error {
if m == nil {
return errors.New("message passed in is nil")
}
var r *http.Request
if !h.dialOpts.Stream {
rc, ok := <-h.r
if !ok {
return io.EOF
}
r = rc
}
// set timeout if its greater than 0
if h.ht.opts.Timeout > time.Duration(0) {
h.conn.SetDeadline(time.Now().Add(h.ht.opts.Timeout))
}
rsp, err := http.ReadResponse(h.buff, r)
if err != nil {
return err
}
defer rsp.Body.Close()
b, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return err
}
if rsp.StatusCode != 200 {
return errors.New(rsp.Status + ": " + string(b))
}
m.Body = b
if m.Header == nil {
m.Header = make(map[string]string)
}
for k, v := range rsp.Header {
if len(v) > 0 {
m.Header[k] = v[0]
} else {
m.Header[k] = ""
}
}
return nil
}
func (h *httpTransportClient) Close() error {
h.once.Do(func() {
h.Lock()
h.buff.Reset(nil)
h.Unlock()
close(h.r)
})
return h.conn.Close()
}
func (h *httpTransportSocket) Local() string {
return h.local
}
func (h *httpTransportSocket) Remote() string {
return h.remote
}
func (h *httpTransportSocket) Recv(m *Message) error {
if m == nil {
return errors.New("message passed in is nil")
}
if m.Header == nil {
m.Header = make(map[string]string)
}
// process http 1
if h.r.ProtoMajor == 1 {
// set timeout if its greater than 0
if h.ht.opts.Timeout > time.Duration(0) {
h.conn.SetDeadline(time.Now().Add(h.ht.opts.Timeout))
}
var r *http.Request
select {
// get first request
case r = <-h.ch:
// read next request
default:
rr, err := http.ReadRequest(h.rw.Reader)
if err != nil {
return err
}
r = rr
}
// read body
b, err := ioutil.ReadAll(r.Body)
if err != nil {
return err
}
// set body
r.Body.Close()
m.Body = b
// set headers
for k, v := range r.Header {
if len(v) > 0 {
m.Header[k] = v[0]
} else {
m.Header[k] = ""
}
}
// return early early
return nil
}
// only process if the socket is open
select {
case <-h.closed:
return io.EOF
default:
// no op
}
// processing http2 request
// read streaming body
// set max buffer size
// TODO: adjustable buffer size
buf := make([]byte, 4*1024*1024)
// read the request body
n, err := h.buf.Read(buf)
// not an eof error
if err != nil {
return err
}
// check if we have data
if n > 0 {
m.Body = buf[:n]
}
// set headers
for k, v := range h.r.Header {
if len(v) > 0 {
m.Header[k] = v[0]
} else {
m.Header[k] = ""
}
}
// set path
m.Header[":path"] = h.r.URL.Path
return nil
}
func (h *httpTransportSocket) Send(m *Message) error {
if h.r.ProtoMajor == 1 {
rsp := &http.Response{
Header: h.r.Header,
Body: ioutil.NopCloser(bytes.NewReader(m.Body)),
Status: "200 OK",
StatusCode: 200,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
ContentLength: int64(len(m.Body)),
}
for k, v := range m.Header {
rsp.Header.Set(k, v)
}
// set timeout if its greater than 0
if h.ht.opts.Timeout > time.Duration(0) {
h.conn.SetDeadline(time.Now().Add(h.ht.opts.Timeout))
}
return rsp.Write(h.conn)
}
// only process if the socket is open
select {
case <-h.closed:
return io.EOF
default:
// no op
}
// set headers
for k, v := range m.Header {
h.w.Header().Set(k, v)
}
// write request
_, err := h.w.Write(m.Body)
// flush the trailers
h.w.(http.Flusher).Flush()
return err
}
func (h *httpTransportSocket) error(m *Message) error {
if h.r.ProtoMajor == 1 {
rsp := &http.Response{
Header: make(http.Header),
Body: ioutil.NopCloser(bytes.NewReader(m.Body)),
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)
}
return nil
}
func (h *httpTransportSocket) Close() error {
h.mtx.Lock()
defer h.mtx.Unlock()
select {
case <-h.closed:
return nil
default:
// close the channel
close(h.closed)
// close the buffer
h.r.Body.Close()
// close the connection
if h.r.ProtoMajor == 1 {
return h.conn.Close()
}
}
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 {
// create handler mux
mux := http.NewServeMux()
// register our transport handler
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
var buf *bufio.ReadWriter
var con net.Conn
// read a regular request
if r.ProtoMajor == 1 {
b, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
r.Body = ioutil.NopCloser(bytes.NewReader(b))
// hijack the conn
hj, ok := w.(http.Hijacker)
if !ok {
// we're screwed
http.Error(w, "cannot serve conn", http.StatusInternalServerError)
return
}
conn, bufrw, err := hj.Hijack()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer conn.Close()
buf = bufrw
con = conn
}
// buffered reader
bufr := bufio.NewReader(r.Body)
// save the request
ch := make(chan *http.Request, 1)
ch <- r
// create a new transport socket
sock := &httpTransportSocket{
ht: h.ht,
w: w,
r: r,
rw: buf,
buf: bufr,
ch: ch,
conn: con,
local: h.Addr(),
remote: r.RemoteAddr,
closed: make(chan bool),
}
// execute the socket
fn(sock)
})
// get optional handlers
if h.ht.opts.Context != nil {
handlers, ok := h.ht.opts.Context.Value("http_handlers").(map[string]http.Handler)
if ok {
for pattern, handler := range handlers {
mux.Handle(pattern, handler)
}
}
}
// default http2 server
srv := &http.Server{
Handler: mux,
}
// insecure connection use h2c
if !(h.ht.opts.Secure || h.ht.opts.TLSConfig != nil) {
srv.Handler = h2c.NewHandler(mux, &http2.Server{})
}
// begin serving
return srv.Serve(h.listener)
}
func (h *httpTransport) Dial(addr string, opts ...DialOption) (Client, error) {
dopts := DialOptions{
Timeout: DefaultDialTimeout,
}
for _, opt := range opts {
opt(&dopts)
}
var conn net.Conn
var err error
// TODO: support dial option here rather than using internal config
if h.opts.Secure || h.opts.TLSConfig != nil {
config := h.opts.TLSConfig
if config == nil {
config = &tls.Config{
InsecureSkipVerify: true,
}
}
config.NextProtos = []string{"http/1.1"}
conn, err = newConn(func(addr string) (net.Conn, error) {
return tls.DialWithDialer(&net.Dialer{Timeout: dopts.Timeout}, "tcp", addr, config)
})(addr)
} else {
conn, err = newConn(func(addr string) (net.Conn, error) {
return net.DialTimeout("tcp", addr, dopts.Timeout)
})(addr)
}
if err != nil {
return nil, err
}
return &httpTransportClient{
ht: h,
addr: addr,
conn: conn,
buff: bufio.NewReader(conn),
dialOpts: dopts,
r: make(chan *http.Request, 1),
local: conn.LocalAddr().String(),
remote: conn.RemoteAddr().String(),
}, nil
}
func (h *httpTransport) Listen(addr string, opts ...ListenOption) (Listener, error) {
var options ListenOptions
for _, o := range opts {
o(&options)
}
var l net.Listener
var err error
// TODO: support use of listen options
if h.opts.Secure || h.opts.TLSConfig != nil {
config := h.opts.TLSConfig
fn := func(addr string) (net.Listener, error) {
if config == nil {
hosts := []string{addr}
// check if its a valid host:port
if host, _, err := net.SplitHostPort(addr); err == nil {
if len(host) == 0 {
hosts = maddr.IPs()
} else {
hosts = []string{host}
}
}
// generate a certificate
cert, err := mls.Certificate(hosts...)
if err != nil {
return nil, err
}
config = &tls.Config{Certificates: []tls.Certificate{cert}}
}
return tls.Listen("tcp", addr, config)
}
l, err = mnet.Listen(addr, fn)
} else {
fn := func(addr string) (net.Listener, error) {
return net.Listen("tcp", addr)
}
l, err = mnet.Listen(addr, fn)
}
if err != nil {
return nil, err
}
return &httpTransportListener{
ht: h,
listener: l,
}, nil
}
func (h *httpTransport) Init(opts ...Option) error {
for _, o := range opts {
o(&h.opts)
}
return nil
}
func (h *httpTransport) Options() Options {
return h.opts
}
func (h *httpTransport) String() string {
return "http"
}
func newHTTPTransport(opts ...Option) *httpTransport {
var options Options
for _, o := range opts {
o(&options)
}
return &httpTransport{opts: options}
}