forked from circonus-labs/circonus-agent
/
address.go
48 lines (41 loc) · 1.15 KB
/
address.go
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// Copyright © 2017 Circonus, Inc. <support@circonus.com>
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
package config
// ParseListen parses and fixes listen spec
import (
"net"
"regexp"
"strings"
"github.com/circonus-labs/circonus-agent/internal/config/defaults"
"github.com/pkg/errors"
)
// ParseListen verifies and parses a listen address spec
func ParseListen(spec string) (*net.TCPAddr, error) {
// empty, default
if spec == "" {
spec = defaults.Listen
}
// only a port, prefix with colon
if ok, _ := regexp.MatchString(`^[0-9]+$`, spec); ok {
spec = ":" + spec
}
// ipv4 w/o port, add default
if strings.Contains(spec, ".") && !strings.Contains(spec, ":") {
spec += defaults.Listen
}
// ipv6 w/o port, add default
if ok, _ := regexp.MatchString(`^\[[a-f0-9:]+\]$`, spec); ok {
spec += defaults.Listen
}
host, port, err := net.SplitHostPort(spec)
if err != nil {
return nil, errors.Wrap(err, "parsing listen")
}
addr, err := net.ResolveTCPAddr("tcp", net.JoinHostPort(host, port))
if err != nil {
return nil, errors.Wrap(err, "resolving listen")
}
return addr, nil
}