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connection.go
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connection.go
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package client
import (
"bufio"
"crypto/tls"
"errors"
"fmt"
"io"
"net"
"net/http"
"time"
"github.com/smallnest/rpcx/log"
"github.com/smallnest/rpcx/share"
"golang.org/x/net/websocket"
)
type ConnFactoryFn func(c *Client, network, address string) (net.Conn, error)
var ConnFactories = map[string]ConnFactoryFn{
"http": newDirectHTTPConn,
"kcp": newDirectKCPConn,
"quic": newDirectQuicConn,
"unix": newDirectConn,
}
// Connect connects the server via specified network.
func (c *Client) Connect(network, address string) error {
var conn net.Conn
var err error
switch network {
case "http":
conn, err = newDirectHTTPConn(c, network, address)
case "ws", "wss":
conn, err = newDirectWSConn(c, network, address)
case "kcp":
conn, err = newDirectKCPConn(c, network, address)
case "quic":
conn, err = newDirectQuicConn(c, network, address)
case "unix":
conn, err = newDirectConn(c, network, address)
default:
fn := ConnFactories[network]
if fn != nil {
conn, err = fn(c, network, address)
} else {
conn, err = newDirectConn(c, network, address)
}
}
if err == nil && conn != nil {
if tc, ok := conn.(*net.TCPConn); ok && c.option.TCPKeepAlivePeriod > 0 {
_ = tc.SetKeepAlive(true)
_ = tc.SetKeepAlivePeriod(c.option.TCPKeepAlivePeriod)
}
if c.option.IdleTimeout != 0 {
_ = conn.SetDeadline(time.Now().Add(c.option.IdleTimeout))
}
if c.Plugins != nil {
conn, err = c.Plugins.DoConnCreated(conn)
if err != nil {
return err
}
}
c.Conn = conn
c.r = bufio.NewReaderSize(conn, ReaderBuffsize)
// c.w = bufio.NewWriterSize(conn, WriterBuffsize)
// start reading and writing since connected
go c.input()
if c.option.Heartbeat && c.option.HeartbeatInterval > 0 {
go c.heartbeat()
}
}
return err
}
func newDirectConn(c *Client, network, address string) (net.Conn, error) {
var conn net.Conn
var tlsConn *tls.Conn
var err error
if c != nil && c.option.TLSConfig != nil {
dialer := &net.Dialer{
Timeout: c.option.ConnectTimeout,
}
tlsConn, err = tls.DialWithDialer(dialer, network, address, c.option.TLSConfig)
// or conn:= tls.Client(netConn, &config)
conn = net.Conn(tlsConn)
} else {
conn, err = net.DialTimeout(network, address, c.option.ConnectTimeout)
}
if err != nil {
log.Warnf("failed to dial server: %v", err)
return nil, err
}
return conn, nil
}
var connected = "200 Connected to rpcx"
func newDirectHTTPConn(c *Client, network, address string) (net.Conn, error) {
if c == nil {
return nil, errors.New("empty client")
}
path := c.option.RPCPath
if path == "" {
path = share.DefaultRPCPath
}
var conn net.Conn
var tlsConn *tls.Conn
var err error
if c.option.TLSConfig != nil {
dialer := &net.Dialer{
Timeout: c.option.ConnectTimeout,
}
tlsConn, err = tls.DialWithDialer(dialer, "tcp", address, c.option.TLSConfig)
// or conn:= tls.Client(netConn, &config)
conn = net.Conn(tlsConn)
} else {
conn, err = net.DialTimeout("tcp", address, c.option.ConnectTimeout)
}
if err != nil {
log.Errorf("failed to dial server: %v", err)
return nil, err
}
_, err = io.WriteString(conn, "CONNECT "+path+" HTTP/1.0\n\n")
if err != nil {
log.Errorf("failed to make CONNECT: %v", err)
return nil, err
}
// Require successful HTTP response
// before switching to RPC protocol.
resp, err := http.ReadResponse(bufio.NewReader(conn), &http.Request{Method: "CONNECT"})
if err == nil && resp.Status == connected {
return conn, nil
}
if err == nil {
log.Errorf("unexpected HTTP response: %v", err)
err = errors.New("unexpected HTTP response: " + resp.Status)
}
conn.Close()
return nil, &net.OpError{
Op: "dial-http",
Net: network + " " + address,
Addr: nil,
Err: err,
}
}
func newDirectWSConn(c *Client, network, address string) (net.Conn, error) {
if c == nil {
return nil, errors.New("empty client")
}
path := c.option.RPCPath
if path == "" {
path = share.DefaultRPCPath
}
var conn net.Conn
var err error
// url := "ws://localhost:12345/ws"
var url, origin string
if network == "ws" {
url = fmt.Sprintf("ws://%s%s", address, path)
origin = fmt.Sprintf("http://%s", address)
} else {
url = fmt.Sprintf("wss://%s%s", address, path)
origin = fmt.Sprintf("https://%s", address)
}
if c.option.TLSConfig != nil {
config, err := websocket.NewConfig(url, origin)
if err != nil {
return nil, err
}
config.TlsConfig = c.option.TLSConfig
conn, err = websocket.DialConfig(config)
} else {
conn, err = websocket.Dial(url, "", origin)
}
return conn, err
}