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43 lines
1.2 KiB
43 lines
1.2 KiB
package net
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import (
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"net"
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"strings"
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)
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// Connect dials the given address and returns a net.Conn. The protoAddr argument should be prefixed with the protocol,
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// eg. "tcp://127.0.0.1:8080" or "unix:///tmp/test.sock"
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func Connect(protoAddr string) (net.Conn, error) {
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proto, address := ProtocolAndAddress(protoAddr)
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conn, err := net.Dial(proto, address)
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return conn, err
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}
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// ProtocolAndAddress splits an address into the protocol and address components.
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// For instance, "tcp://127.0.0.1:8080" will be split into "tcp" and "127.0.0.1:8080".
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// If the address has no protocol prefix, the default is "tcp".
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func ProtocolAndAddress(listenAddr string) (string, string) {
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protocol, address := "tcp", listenAddr
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parts := strings.SplitN(address, "://", 2)
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if len(parts) == 2 {
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protocol, address = parts[0], parts[1]
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}
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return protocol, address
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}
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// GetFreePort gets a free port from the operating system.
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// Ripped from https://github.com/phayes/freeport.
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// BSD-licensed.
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func GetFreePort() (int, error) {
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addr, err := net.ResolveTCPAddr("tcp", "localhost:0")
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if err != nil {
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return 0, err
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}
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l, err := net.ListenTCP("tcp", addr)
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if err != nil {
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return 0, err
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}
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defer l.Close()
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return l.Addr().(*net.TCPAddr).Port, nil
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}
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