micro/transport/http_transport.go

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package transport
import (
"bufio"
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"bytes"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
"log"
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"net"
"net/http"
"net/url"
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"strconv"
"strings"
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"sync"
"time"
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mls "github.com/micro/misc/lib/tls"
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)
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type buffer struct {
io.ReadWriter
}
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type httpTransport struct {
opts Options
}
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type httpTransportClient struct {
ht *httpTransport
addr string
conn net.Conn
dialOpts DialOptions
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once sync.Once
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sync.Mutex
r chan *http.Request
bl []*http.Request
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buff *bufio.Reader
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}
type httpTransportSocket struct {
r chan *http.Request
conn net.Conn
once sync.Once
sync.Mutex
buff *bufio.Reader
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}
type httpTransportListener struct {
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listener net.Listener
}
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func listen(addr string, fn func(string) (net.Listener, error)) (net.Listener, error) {
// host:port || host:min-max
parts := strings.Split(addr, ":")
//
if len(parts) < 2 {
return fn(addr)
}
// try to extract port range
ports := strings.Split(parts[len(parts)-1], "-")
// single port
if len(ports) < 2 {
return fn(addr)
}
// we have a port range
// extract min port
min, err := strconv.Atoi(ports[0])
if err != nil {
return nil, errors.New("unable to extract port range")
}
// extract max port
max, err := strconv.Atoi(ports[1])
if err != nil {
return nil, errors.New("unable to extract port range")
}
// set host
host := parts[:len(parts)-1]
// range the ports
for port := min; port <= max; port++ {
// try bind to host:port
ln, err := fn(fmt.Sprintf("%s:%d", host, port))
if err == nil {
return ln, nil
}
// hit max port
if port == max {
return nil, err
}
}
// why are we here?
return nil, fmt.Errorf("unable to bind to %s", addr)
}
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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.Lock()
h.bl = append(h.bl, req)
select {
case h.r <- h.bl[0]:
h.bl = h.bl[1:]
default:
}
h.Unlock()
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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}
if rsp.StatusCode != 200 {
return errors.New(rsp.Status + ": " + string(b))
}
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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")
}
r, err := http.ReadRequest(h.buff)
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if err != nil {
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return err
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}
b, err := ioutil.ReadAll(r.Body)
if err != nil {
return err
}
r.Body.Close()
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mr := &Message{
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Header: make(map[string]string),
Body: b,
}
for k, v := range r.Header {
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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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}
}
select {
case h.r <- r:
default:
}
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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()
r := <-h.r
rsp := &http.Response{
Header: 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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select {
case h.r <- r:
default:
}
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 {
err := h.conn.Close()
h.once.Do(func() {
h.Lock()
h.buff.Reset(nil)
h.buff = nil
h.Unlock()
})
return err
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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 {
var tempDelay time.Duration
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for {
c, err := h.listener.Accept()
if err != nil {
if ne, ok := err.(net.Error); ok && ne.Temporary() {
if tempDelay == 0 {
tempDelay = 5 * time.Millisecond
} else {
tempDelay *= 2
}
if max := 1 * time.Second; tempDelay > max {
tempDelay = max
}
log.Printf("http: Accept error: %v; retrying in %v\n", err, tempDelay)
time.Sleep(tempDelay)
continue
}
return err
}
sock := &httpTransportSocket{
conn: c,
buff: bufio.NewReader(c),
r: make(chan *http.Request, 1),
}
go func() {
// TODO: think of a better error response strategy
defer func() {
if r := recover(); r != nil {
sock.Close()
}
}()
fn(sock)
}()
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}
}
func (h *httpTransport) Dial(addr string, opts ...DialOption) (Client, error) {
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dopts := DialOptions{
Timeout: DefaultDialTimeout,
}
for _, opt := range opts {
opt(&dopts)
}
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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,
}
}
conn, err = tls.DialWithDialer(&net.Dialer{Timeout: dopts.Timeout}, "tcp", addr, config)
} else {
conn, err = net.DialTimeout("tcp", addr, dopts.Timeout)
}
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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),
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}, nil
}
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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
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fn := func(addr string) (net.Listener, error) {
if config == nil {
cert, err := mls.Certificate(addr)
if err != nil {
return nil, err
}
config = &tls.Config{Certificates: []tls.Certificate{cert}}
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}
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return tls.Listen("tcp", addr, config)
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}
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l, err = listen(addr, fn)
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} else {
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fn := func(addr string) (net.Listener, error) {
return net.Listen("tcp", addr)
}
l, err = listen(addr, fn)
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}
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if err != nil {
return nil, err
}
return &httpTransportListener{
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listener: l,
}, nil
}
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func (h *httpTransport) String() string {
return "http"
}
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func newHTTPTransport(opts ...Option) *httpTransport {
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var options Options
for _, o := range opts {
o(&options)
}
return &httpTransport{opts: options}
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}