micro/util/net/net.go

118 lines
2.4 KiB
Go
Raw Normal View History

2019-05-31 01:52:10 +03:00
package net
import (
"errors"
"fmt"
"net"
"os"
2019-05-31 01:52:10 +03:00
"strconv"
"strings"
)
// HostPort format addr and port suitable for dial
func HostPort(addr string, port interface{}) string {
host := addr
if strings.Count(addr, ":") > 0 {
host = fmt.Sprintf("[%s]", addr)
}
2019-08-14 16:32:28 +03:00
// when port is blank or 0, host is a queue name
if v, ok := port.(string); ok && v == "" {
return host
} else if v, ok := port.(int); ok && v == 0 && net.ParseIP(host) == nil {
return host
}
2019-08-14 16:32:28 +03:00
return fmt.Sprintf("%s:%v", host, port)
}
2019-05-31 01:52:10 +03:00
// Listen takes addr:portmin-portmax and binds to the first available port
// Example: Listen("localhost:5000-6000", fn)
func Listen(addr string, fn func(string) (net.Listener, error)) (net.Listener, error) {
if strings.Count(addr, ":") == 1 && strings.Count(addr, "-") == 0 {
2019-05-31 01:52:10 +03:00
return fn(addr)
}
// host:port || host:min-max
host, ports, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
2019-05-31 01:52:10 +03:00
// try to extract port range
prange := strings.Split(ports, "-")
2019-05-31 01:52:10 +03:00
// single port
if len(prange) < 2 {
2019-05-31 01:52:10 +03:00
return fn(addr)
}
// we have a port range
// extract min port
min, err := strconv.Atoi(prange[0])
2019-05-31 01:52:10 +03:00
if err != nil {
return nil, errors.New("unable to extract port range")
}
// extract max port
max, err := strconv.Atoi(prange[1])
2019-05-31 01:52:10 +03:00
if err != nil {
return nil, errors.New("unable to extract port range")
}
// range the ports
for port := min; port <= max; port++ {
// try bind to host:port
ln, err := fn(HostPort(host, port))
2019-05-31 01:52:10 +03:00
if err == nil {
return ln, nil
}
// hit max port
if port == max {
return nil, err
}
}
// why are we here?
return nil, fmt.Errorf("unable to bind to %s", addr)
}
// Proxy returns the proxy and the address if it exits
func Proxy(service string, address []string) (string, []string, bool) {
var hasProxy bool
// get proxy
if prx := os.Getenv("MICRO_PROXY"); len(prx) > 0 {
// default name
if prx == "service" {
prx = "go.micro.proxy"
}
service = prx
hasProxy = true
}
// get proxy address
if prx := os.Getenv("MICRO_PROXY_ADDRESS"); len(prx) > 0 {
address = []string{prx}
hasProxy = true
}
if prx := os.Getenv("MICRO_NETWORK"); len(prx) > 0 {
// default name
if prx == "service" {
prx = "go.micro.network"
}
service = prx
hasProxy = true
}
2020-04-22 12:44:34 +03:00
if prx := os.Getenv("MICRO_NETWORK_ADDRESS"); len(prx) > 0 {
address = []string{prx}
hasProxy = true
}
return service, address, hasProxy
}