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gtcp_func.go
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/
gtcp_func.go
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// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
package gtcp
import (
"crypto/rand"
"crypto/tls"
"net"
"time"
"github.com/gogf/gf/v2/errors/gerror"
"github.com/gogf/gf/v2/os/gfile"
)
const (
defaultConnTimeout = 30 * time.Second // Default connection timeout.
defaultRetryInternal = 100 * time.Millisecond // Default retry interval.
defaultReadBufferSize = 128 // (Byte) Buffer size for reading.
)
type Retry struct {
Count int // Retry count.
Interval time.Duration // Retry interval.
}
// NewNetConn creates and returns a net.Conn with given address like "127.0.0.1:80".
// The optional parameter `timeout` specifies the timeout for dialing connection.
func NewNetConn(address string, timeout ...time.Duration) (net.Conn, error) {
var (
network = `tcp`
duration = defaultConnTimeout
)
if len(timeout) > 0 {
duration = timeout[0]
}
conn, err := net.DialTimeout(network, address, duration)
if err != nil {
err = gerror.Wrapf(
err,
`net.DialTimeout failed with network "%s", address "%s", timeout "%s"`,
network, address, duration,
)
}
return conn, err
}
// NewNetConnTLS creates and returns a TLS net.Conn with given address like "127.0.0.1:80".
// The optional parameter `timeout` specifies the timeout for dialing connection.
func NewNetConnTLS(address string, tlsConfig *tls.Config, timeout ...time.Duration) (net.Conn, error) {
var (
network = `tcp`
dialer = &net.Dialer{
Timeout: defaultConnTimeout,
}
)
if len(timeout) > 0 {
dialer.Timeout = timeout[0]
}
conn, err := tls.DialWithDialer(dialer, network, address, tlsConfig)
if err != nil {
err = gerror.Wrapf(
err,
`tls.DialWithDialer failed with network "%s", address "%s", timeout "%s", tlsConfig "%v"`,
network, address, dialer.Timeout, tlsConfig,
)
}
return conn, err
}
// NewNetConnKeyCrt creates and returns a TLS net.Conn with given TLS certificate and key files
// and address like "127.0.0.1:80". The optional parameter `timeout` specifies the timeout for
// dialing connection.
func NewNetConnKeyCrt(addr, crtFile, keyFile string, timeout ...time.Duration) (net.Conn, error) {
tlsConfig, err := LoadKeyCrt(crtFile, keyFile)
if err != nil {
return nil, err
}
return NewNetConnTLS(addr, tlsConfig, timeout...)
}
// Send creates connection to `address`, writes `data` to the connection and then closes the connection.
// The optional parameter `retry` specifies the retry policy when fails in writing data.
func Send(address string, data []byte, retry ...Retry) error {
conn, err := NewConn(address)
if err != nil {
return err
}
defer conn.Close()
return conn.Send(data, retry...)
}
// SendRecv creates connection to `address`, writes `data` to the connection, receives response
// and then closes the connection.
//
// The parameter `length` specifies the bytes count waiting to receive. It receives all buffer content
// and returns if `length` is -1.
//
// The optional parameter `retry` specifies the retry policy when fails in writing data.
func SendRecv(address string, data []byte, length int, retry ...Retry) ([]byte, error) {
conn, err := NewConn(address)
if err != nil {
return nil, err
}
defer conn.Close()
return conn.SendRecv(data, length, retry...)
}
// SendWithTimeout does Send logic with writing timeout limitation.
func SendWithTimeout(address string, data []byte, timeout time.Duration, retry ...Retry) error {
conn, err := NewConn(address)
if err != nil {
return err
}
defer conn.Close()
return conn.SendWithTimeout(data, timeout, retry...)
}
// SendRecvWithTimeout does SendRecv logic with reading timeout limitation.
func SendRecvWithTimeout(address string, data []byte, receive int, timeout time.Duration, retry ...Retry) ([]byte, error) {
conn, err := NewConn(address)
if err != nil {
return nil, err
}
defer conn.Close()
return conn.SendRecvWithTimeout(data, receive, timeout, retry...)
}
// isTimeout checks whether given `err` is a timeout error.
func isTimeout(err error) bool {
if err == nil {
return false
}
if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
return true
}
return false
}
// LoadKeyCrt creates and returns a TLS configuration object with given certificate and key files.
func LoadKeyCrt(crtFile, keyFile string) (*tls.Config, error) {
crtPath, err := gfile.Search(crtFile)
if err != nil {
return nil, err
}
keyPath, err := gfile.Search(keyFile)
if err != nil {
return nil, err
}
crt, err := tls.LoadX509KeyPair(crtPath, keyPath)
if err != nil {
return nil, gerror.Wrapf(err,
`tls.LoadX509KeyPair failed for certFile "%s" and keyFile "%s"`,
crtPath, keyPath,
)
}
tlsConfig := &tls.Config{}
tlsConfig.Certificates = []tls.Certificate{crt}
tlsConfig.Time = time.Now
tlsConfig.Rand = rand.Reader
return tlsConfig, nil
}
// MustGetFreePort performs as GetFreePort, but it panics is any error occurs.
func MustGetFreePort() int {
port, err := GetFreePort()
if err != nil {
panic(err)
}
return port
}
// GetFreePort retrieves and returns a port that is free.
func GetFreePort() (port int, err error) {
var (
network = `tcp`
address = `:0`
)
resolvedAddr, err := net.ResolveTCPAddr(network, address)
if err != nil {
return 0, gerror.Wrapf(
err,
`net.ResolveTCPAddr failed for network "%s", address "%s"`,
network, address,
)
}
l, err := net.ListenTCP(network, resolvedAddr)
if err != nil {
return 0, gerror.Wrapf(
err,
`net.ListenTCP failed for network "%s", address "%s"`,
network, resolvedAddr.String(),
)
}
port = l.Addr().(*net.TCPAddr).Port
if err = l.Close(); err != nil {
err = gerror.Wrapf(
err,
`close listening failed for network "%s", address "%s", port "%d"`,
network, resolvedAddr.String(), port,
)
}
return
}
// GetFreePorts retrieves and returns specified number of ports that are free.
func GetFreePorts(count int) (ports []int, err error) {
var (
network = `tcp`
address = `:0`
)
for i := 0; i < count; i++ {
resolvedAddr, err := net.ResolveTCPAddr(network, address)
if err != nil {
return nil, gerror.Wrapf(
err,
`net.ResolveTCPAddr failed for network "%s", address "%s"`,
network, address,
)
}
l, err := net.ListenTCP(network, resolvedAddr)
if err != nil {
return nil, gerror.Wrapf(
err,
`net.ListenTCP failed for network "%s", address "%s"`,
network, resolvedAddr.String(),
)
}
ports = append(ports, l.Addr().(*net.TCPAddr).Port)
_ = l.Close()
}
return ports, nil
}