124 lines
3.0 KiB
Go
124 lines
3.0 KiB
Go
// Copyright 2017 Google LLC
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
package sync
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"time"
|
|
|
|
externalip "gitlab.com/vocdoni/go-external-ip"
|
|
)
|
|
|
|
type IPType uint
|
|
|
|
const (
|
|
IP4 IPType = 4
|
|
IP6 IPType = 6
|
|
)
|
|
|
|
var webCheck = []string{
|
|
"http://checkip.dyndns.org/",
|
|
"http://ipdetect.dnspark.com/",
|
|
"http://dns.loopia.se/checkip/checkip.php",
|
|
}
|
|
|
|
// IPAddressPoller is a poller used to check the value
|
|
// of the current public internet IP address.
|
|
type IPAddressPoller struct {
|
|
channels []chan string
|
|
pollInterval time.Duration
|
|
consensus *externalip.Consensus
|
|
iptype IPType
|
|
}
|
|
|
|
func NewIPAddressPoller(iptype IPType, pollInterval time.Duration, consensus *externalip.Consensus) *IPAddressPoller {
|
|
if consensus == nil {
|
|
return &IPAddressPoller{
|
|
pollInterval: pollInterval,
|
|
consensus: externalip.DefaultConsensus(nil, nil),
|
|
iptype: iptype,
|
|
}
|
|
}
|
|
return &IPAddressPoller{
|
|
pollInterval: pollInterval,
|
|
consensus: consensus,
|
|
iptype: iptype,
|
|
}
|
|
}
|
|
|
|
// Channel returns a channel that receives data whenever an
|
|
// IP address value is received.
|
|
func (i *IPAddressPoller) Channel() <-chan string {
|
|
c := make(chan string, 1)
|
|
i.channels = append(i.channels, c)
|
|
return c
|
|
}
|
|
|
|
// poll() runs a single polling event and retrieving the internet IP.
|
|
func (i *IPAddressPoller) poll() error {
|
|
// Make a request to each url and send to the
|
|
// channels if a consensus is achieved
|
|
ip, err := i.consensus.ExternalIP(uint(i.iptype))
|
|
if err != nil {
|
|
return fmt.Errorf("could not obtain IP address: %w", err)
|
|
}
|
|
log.Printf("Found IP %v", ip)
|
|
for _, c := range i.channels {
|
|
select {
|
|
case c <- ip.String():
|
|
default:
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// request() makes a request to a URL to get the internet IP address.
|
|
// func html_parser(url string) (string, error) {
|
|
// z := html.NewTokenizer(resp.Body)
|
|
// for {
|
|
// tt := z.Next()
|
|
// switch tt {
|
|
// case html.ErrorToken:
|
|
// return "", z.Err()
|
|
// case html.TextToken:
|
|
// text := strings.Trim(string(z.Text()), " \n\t")
|
|
// if text != "" {
|
|
// ip := ""
|
|
// fmt.Sscanf(text, "Current IP Address: %s", &ip)
|
|
// if ip != "" {
|
|
// return strings.Trim(ip, " \n\t"), nil
|
|
// }
|
|
// }
|
|
// }
|
|
// }
|
|
// }
|
|
|
|
// Run starts the main loop for the poller.
|
|
func (i *IPAddressPoller) Run(stopCh <-chan struct{}) error {
|
|
if err := i.poll(); err != nil {
|
|
log.Printf("Error polling for IP: %v", err)
|
|
}
|
|
for {
|
|
select {
|
|
case <-time.After(i.pollInterval):
|
|
if err := i.poll(); err != nil {
|
|
log.Printf("Error polling for IP: %v", err)
|
|
}
|
|
case <-stopCh:
|
|
return nil
|
|
}
|
|
}
|
|
}
|