1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
package main
import (
"fmt"
"io/ioutil"
"net"
"os"
"path/filepath"
"strings"
"sync"
"time"
)
func fmtAddress(node, port string) string {
if isIPv6(node) {
return fmt.Sprintf("[%s]:%s", node, port)
} else {
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 result_name string
var result_version string
var result_error error
go func() {
defer _wg.Done()
result_name, result_version, result_error = Hello(addr)
}()
var result_ping float64
go func() {
defer _wg.Done()
result_ping = Ping(addr.IP)
}()
_wg.Wait()
result := map[string]interface{}{}
if result_error == nil {
result["name"] = result_name
result["version"] = result_version
} else {
result["error"] = result_error
}
if result_ping >= 0 {
result["ping"] = result_ping
}
return NewPoint("public", tags, result)
}
var dialer = net.Dialer{
Timeout: 10 * time.Second,
}
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)
}
jwg.Watch(time.Second)
}
|