go.temporal.io/server/common/config/localip.go
79 LOC · 23 covered · 56 uncovered · 5 ranges · 1 concepts · 1 introducers · 1 tests
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package config
// ** This code is copied from tchannel, we would like to not take dependency on tchannel code **
import (
"errors"
"net"
)
// scoreAddr scores how likely the given addr is to be a remote address and returns the
// IP to use when listening. Any address which receives a negative score should not be used.
// Scores are calculated as:
// -1 for any unknown IP addreseses.
// +300 for IPv4 addresses
// +100 for non-local addresses, extra +100 for "up" interaces.
var ip net.IP
if netAddr, ok := addr.(*net.IPNet); ok {
ip = netAddr.IP
} else if netIP, ok := addr.(*net.IPAddr); ok {
ip = netIP.IP
} else {
return -1, nil
}
if ip.To4() != nil {
score += 300
}
if iface.Flags&net.FlagLoopback == 0 && !ip.IsLoopback() {
score += 100
if iface.Flags&net.FlagUp != 0 {
score += 100
}
}
}
// ListenIP returns the IP to bind to in Listen. It tries to find an IP that can be used
// by other machines to reach this machine.
func ListenIP() (net.IP, error) {
interfaces, err := net.Interfaces()
if err != nil {
return nil, err
}
bestScore := -1
var bestIP net.IP
// Select the highest scoring IP as the best IP.
for _, iface := range interfaces {
addrs, err := iface.Addrs()
if err != nil {
// Skip this interface if there is an error.
continue
}
for _, addr := range addrs {
score, ip := scoreAddr(iface, addr)
if score > bestScore {
bestScore = score
bestIP = ip
}
}
}
if bestScore == -1 {
return nil, errors.New("no addresses to listen on")
}
return bestIP, nil
}
addr, err := net.ParseMAC(s)
if err != nil {
panic(err)
}
}