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|
package main
import (
"fmt"
"io/ioutil"
"net"
"os"
"path/filepath"
"sort"
"strings"
"sync"
"time"
)
// Given a host/node name and a port number, format a string suitable
// for net.Dial.
func fmtAddress(node, port string) string {
if isIPv6(node) {
return fmt.Sprintf("[%s]:%s", node, port)
}
return fmt.Sprintf("%s:%s", node, port)
}
func isIPv6(node string) bool {
ip := net.ParseIP(node)
return ip != nil && ip.To4() == nil
}
var jwg JobWaitGroup
func emit(pt Point) {
if pt == nil {
return
}
fmt.Println(pt)
}
func doHostfile(fname string) {
hostname := filepath.Base(fname)
cfg, err := ReadConfigFile(fname)
if err != nil {
emit(NewPoint("public", map[string]string{"host": hostname}, map[string]interface{}{"error": err.Error()}))
return
}
addresses := make(map[string]struct{})
for _, address := range GetAddresses(cfg) {
addresses[fmtAddress(address.Node, address.Port)] = struct{}{}
}
for address := range addresses {
jwg.Do(hostname+"/"+address+"/tcp4", func() { emit(doAddress(hostname, "tcp4", address)) })
jwg.Do(hostname+"/"+address+"/tcp6", func() { emit(doAddress(hostname, "tcp6", address)) })
}
}
func doAddress(host, network, address string) Point {
tags := map[string]string{
"host": host,
"network": network,
"address": address,
}
addr, err := net.ResolveTCPAddr(network, address)
if err != nil {
if ae, ok := err.(*net.AddrError); ok && ae.Err == "no suitable address found" {
return nil
}
return NewPoint("public", tags, map[string]interface{}{"error": err.Error()})
}
var _wg sync.WaitGroup
_wg.Add(2)
var resultName string
var resultVersion string
var resultError error
go func() {
defer _wg.Done()
resultName, resultVersion, resultError = hello(addr)
}()
var resultPing float64
go func() {
defer _wg.Done()
resultPing = Ping(addr.IP)
}()
_wg.Wait()
result := map[string]interface{}{}
if resultError == nil {
result["name"] = resultName
result["version"] = resultVersion
} else {
result["error"] = resultError
}
if resultPing >= 0 {
result["ping"] = resultPing
}
return NewPoint("public", tags, result)
}
var dialer = net.Dialer{
Timeout: 10 * time.Second,
}
// hello opens a TCP connection and waits for a Tinc server to say
// hello.
func hello(addr *net.TCPAddr) (name, version string, err error) {
conn, err := dialer.Dial(addr.Network(), addr.String())
if err != nil {
return "", "", err
}
defer conn.Close()
conn.SetDeadline(time.Now().Add(10 * time.Second))
conn.(*net.TCPConn).CloseWrite()
all, _ := ioutil.ReadAll(conn)
line := strings.TrimRight(string(all), "\n")
parts := strings.Split(line, " ")
if len(parts) != 3 {
return "", "", fmt.Errorf("malformed ID line: %q", line)
}
return parts[1], parts[2], nil
}
func main() {
for _, fname := range os.Args[1:] {
doHostfile(fname)
}
watch(time.Second)
}
func watch(d time.Duration) {
ticker := time.NewTicker(d)
done := make(chan map[string]time.Duration)
go func() {
jobs := jwg.Wait()
ticker.Stop()
done <- jobs
}()
for {
select {
case <-ticker.C:
n, jobs := jwg.Status()
if len(jobs) == 0 {
panic("no active jobs, but wg still waiting")
}
line := fmt.Sprintf("%d/%d : %v", len(jobs), n, strings.Join(jobs, ", "))
if len(line) > 70 {
line = line[:67] + "..."
}
fmt.Fprintf(os.Stderr, "%-70s\r", line)
case jobs := <-done:
fmt.Fprintf(os.Stderr, "%-70s\n", "done")
s := newSortHelper(jobs)
sort.Sort(s)
for _, job := range s.StringSlice {
fmt.Fprintln(os.Stderr, s.times[job], job)
}
return
}
}
}
type sortHelper struct {
times map[string]time.Duration
sort.StringSlice
}
func (s sortHelper) Less(i, j int) bool {
return s.times[s.StringSlice[i]] < s.times[s.StringSlice[j]]
}
func newSortHelper(jobs map[string]time.Duration) sortHelper {
slice := make([]string, 0, len(jobs))
for job := range jobs {
slice = append(slice, job)
}
return sortHelper{times: jobs, StringSlice: slice}
}
|
