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hostname.go
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hostname.go
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// Copyright 2022 V Kontakte LLC
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
package srvfunc
import (
"net"
"os"
"strconv"
"strings"
)
var hostNameCache string
var hostNameCacheForStatshouse string
func init() {
hostNameCache, _ = os.Hostname() // TODO - panic/fatal on error?
// Motivation - Kubernetes hostname includes deployment ID which prevents grouping and creates mapping flood
// glavred-production-mltasks-5649b7d9b4-d5qtf
// keanu-rq-production-mltasks-d665549fb-6phdc
// we check for pattern, then strip deployment ID.
hostNameCacheForStatshouse = hostNameCache
n, ok := removeKuberDeploymentName(hostNameCache)
if !ok {
return // this check is faster than env
}
insideKuber :=
os.Getenv("KUBERNETES_SERVICE_PORT_HTTPS") != "" ||
os.Getenv("KUBERNETES_PORT") != "" ||
os.Getenv("KUBERNETES_PORT_443_TCP") != "" ||
os.Getenv("KUBERNETES_PORT_443_TCP_PROTO") != "" ||
os.Getenv("KUBERNETES_PORT_443_TCP_PORT") != "" ||
os.Getenv("KUBERNETES_PORT_443_TCP_ADDR") != "" ||
os.Getenv("KUBERNETES_SERVICE_HOST") != "" ||
os.Getenv("KUBERNETES_SERVICE_PORT") != ""
if !insideKuber {
return
}
hostNameCacheForStatshouse = n
}
func removeKuberDeploymentName(str string) (string, bool) {
if len(str) < 6 || str[len(str)-5-1] != '-' {
return str, false
}
if len(str) > 17 && str[len(str)-5-1-10-1] == '-' {
return str[:len(str)-5-1], true
}
if len(str) > 16 && str[len(str)-5-1-9-1] == '-' {
return str[:len(str)-5-1], true
}
return str, false
}
// cached, not expected to change
func Hostname() string {
return hostNameCache
}
// cached, without Kubernetes deployment ID, recommended for use as statshouse keys
func HostnameForStatshouse() string {
return hostNameCacheForStatshouse
}
// Deprecated: always prefer Hostname() or HostnameForStatshouse() when saving in logs, etc
func NumericHost() (uint64, error) {
numHost := ""
for _, v := range hostNameCache {
if v >= '0' && v <= '9' {
numHost += string(v)
}
}
return strconv.ParseUint(numHost, 10, 64)
}
// For now, return only IPv4 addresses. If they are empty, return all.
func ExternalIPAddrs() string {
var ipv4 []string
var all []string
addrs, err := net.InterfaceAddrs()
if err != nil {
return "<error>"
}
for _, addr := range addrs {
switch v := addr.(type) {
case *net.IPNet:
if !v.IP.IsLoopback() {
if v.IP.To4() != nil {
ipv4 = append(ipv4, v.IP.String())
}
all = append(all, v.IP.String())
}
default:
}
}
if len(ipv4) != 0 {
return strings.Join(ipv4, ",")
}
return strings.Join(all, ",")
}