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client.go
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client.go
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package fastws
import (
"bufio"
"bytes"
"crypto/rand"
"crypto/tls"
"errors"
"net"
"github.com/valyala/fasthttp"
)
var (
// ErrCannotUpgrade shows up when an error ocurred when upgrading a connection.
ErrCannotUpgrade = errors.New("cannot upgrade connection")
)
// Client returns Conn using existing connection.
//
// url must be complete URL format i.e. http://localhost:8080/ws
func Client(c net.Conn, url string) (*Conn, error) {
return client(c, url, nil)
}
// ClientWithHeaders returns a Conn using existing connection and sending personalized headers.
func ClientWithHeaders(c net.Conn, url string, req *fasthttp.Request) (*Conn, error) {
return client(c, url, req)
}
func client(c net.Conn, url string, r *fasthttp.Request) (conn *Conn, err error) {
req := fasthttp.AcquireRequest()
res := fasthttp.AcquireResponse()
uri := fasthttp.AcquireURI()
defer fasthttp.ReleaseRequest(req)
defer fasthttp.ReleaseResponse(res)
defer fasthttp.ReleaseURI(uri)
uri.Update(url)
origin := bytePool.Get().([]byte)
key := bytePool.Get().([]byte)
defer bytePool.Put(origin)
defer bytePool.Put(key)
origin = prepareOrigin(origin, uri)
key = makeRandKey(key[:0])
if r != nil {
r.CopyTo(req)
}
req.Header.SetMethod("GET")
req.Header.AddBytesKV(originString, origin)
req.Header.AddBytesKV(connectionString, upgradeString)
req.Header.AddBytesKV(upgradeString, websocketString)
req.Header.AddBytesKV(wsHeaderVersion, supportedVersions[0])
req.Header.AddBytesKV(wsHeaderKey, key)
// TODO: Add compression
req.SetRequestURIBytes(uri.FullURI())
br := bufio.NewReader(c)
bw := bufio.NewWriter(c)
req.Write(bw)
bw.Flush()
err = res.Read(br)
if err == nil {
if res.StatusCode() != 101 ||
!equalsFold(res.Header.PeekBytes(upgradeString), websocketString) {
err = ErrCannotUpgrade
} else {
conn = acquireConn(c)
conn.server = false
}
}
return conn, err
}
// Dial establishes a websocket connection as client.
//
// url parameter must follow WebSocket URL format i.e. ws://host:port/path
func Dial(url string) (*Conn, error) {
return dial(url, nil)
}
// DialWithHeaders establishes a websocket connection as client sending a personalized request.
func DialWithHeaders(url string, req *fasthttp.Request) (*Conn, error) {
return dial(url, req)
}
func dial(url string, req *fasthttp.Request) (conn *Conn, err error) {
uri := fasthttp.AcquireURI()
defer fasthttp.ReleaseURI(uri)
uri.Update(url)
scheme := "https"
port := ":443"
if bytes.Equal(uri.Scheme(), wsString) {
scheme, port = "http", ":80"
}
uri.SetScheme(scheme)
addr := bytePool.Get().([]byte)
defer bytePool.Put(addr)
addr = append(addr[:0], uri.Host()...)
if n := bytes.LastIndexByte(addr, ':'); n == -1 {
addr = append(addr, port...)
}
var c net.Conn
if scheme == "http" {
c, err = net.Dial("tcp", b2s(addr))
} else {
c, err = tls.Dial("tcp", b2s(addr), &tls.Config{
InsecureSkipVerify: false,
MinVersion: tls.VersionTLS11,
})
}
if err == nil {
conn, err = client(c, uri.String(), req)
if err != nil {
c.Close()
}
}
return conn, err
}
func makeRandKey(b []byte) []byte {
b = extendByteSlice(b, 16)
rand.Read(b[:16])
b = appendEncode(base64, b[:0], b[:16])
return b
}