89 lines
2.8 KiB
Go
89 lines
2.8 KiB
Go
// Copyright 2018 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cluster
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import (
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"net"
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"github.com/hashicorp/go-sockaddr"
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"github.com/pkg/errors"
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)
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type getIPFunc func() (string, error)
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// These are overridden in unit tests to mock the sockaddr functions.
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var (
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getPrivateAddress getIPFunc = sockaddr.GetPrivateIP
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getPublicAddress getIPFunc = sockaddr.GetPublicIP
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)
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// calculateAdvertiseAddress attempts to clone logic from deep within memberlist
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// (NetTransport.FinalAdvertiseAddr) in order to surface its conclusions to the
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// application, so we can provide more actionable error messages if the user has
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// inadvertently misconfigured their cluster.
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//
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// https://github.com/hashicorp/memberlist/blob/022f081/net_transport.go#L126
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func calculateAdvertiseAddress(bindAddr, advertiseAddr string, allowInsecureAdvertise bool) (net.IP, error) {
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if advertiseAddr != "" {
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ip := net.ParseIP(advertiseAddr)
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if ip == nil {
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return nil, errors.Errorf("failed to parse advertise addr '%s'", advertiseAddr)
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}
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if ip4 := ip.To4(); ip4 != nil {
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ip = ip4
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}
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return ip, nil
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}
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if isAny(bindAddr) {
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return discoverAdvertiseAddress(allowInsecureAdvertise)
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}
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ip := net.ParseIP(bindAddr)
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if ip == nil {
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return nil, errors.Errorf("failed to parse bind addr '%s'", bindAddr)
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}
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return ip, nil
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}
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// discoverAdvertiseAddress will attempt to get a single IP address to use as
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// the advertise address when one is not explicitly provided. It defaults to
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// using a private IP address, and if not found then using a public IP if
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// insecure advertising is allowed.
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func discoverAdvertiseAddress(allowInsecureAdvertise bool) (net.IP, error) {
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addr, err := getPrivateAddress()
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if err != nil {
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return nil, errors.Wrap(err, "failed to get private IP")
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}
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if addr == "" && !allowInsecureAdvertise {
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return nil, errors.New("no private IP found, explicit advertise addr not provided")
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}
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if addr == "" {
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addr, err = getPublicAddress()
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if err != nil {
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return nil, errors.Wrap(err, "failed to get public IP")
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}
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if addr == "" {
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return nil, errors.New("no private/public IP found, explicit advertise addr not provided")
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}
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}
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ip := net.ParseIP(addr)
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if ip == nil {
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return nil, errors.Errorf("failed to parse discovered IP '%s'", addr)
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}
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return ip, nil
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}
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