/
main.go
232 lines (190 loc) · 4.78 KB
/
main.go
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package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"net"
"net/http"
"os"
"reflect"
"strconv"
"strings"
"time"
"github.com/kr/beanstalk"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"github.com/gorilla/schema"
"github.com/kr/pretty"
)
type Latency int64
type LogData struct {
Timev4 Latency `json:"ipv4,omitempty" schema:"ipv4"`
Timev6 Latency `json:"ipv6,omitempty" schema:"ipv6"`
Timev64 Latency `json:"ipv64,omitempty" schema:"ipv64"`
IPv4 string `json:"ipv4_ip,omitempty" schema:"ipv4_ip"`
IPv6 string `json:"ipv6_ip,omitempty" schema:"ipv6_ip"`
Iv64 string `json:"ipv64_ip,omitempty" schema:"ipv64_ip"`
Site string `json:"site,omitempty"`
UserID string `json:"v6uq" schema:"v6uq"`
Version string `json:"version"`
UserAgent string `json:"user-agent" schema:"-"`
Time int64 `json:"time" schema:"-"`
Referrer string `json:"referrer" schema:"-"`
RemoteIP string `json:"remote_ip" schema:"-"`
Host string `json:"host" schema:"-"`
Callback string `json:"-"`
}
var (
flagip = flag.String("ip", "", "Listen on this IP address")
flaghttpport = flag.String("httpport", "6062", "Set the HTTP port")
)
var decoder *schema.Decoder
var beanCh chan []byte
var localNets []*net.IPNet
func init() {
beanCh = make(chan []byte, 200)
decoder = schema.NewDecoder()
decoder.ZeroEmpty(true)
decoder.IgnoreUnknownKeys(true)
decoder.RegisterConverter(Latency(0), func(v string) reflect.Value {
i, err := strconv.Atoi(v)
if err != nil {
l := Latency(0)
return reflect.ValueOf(l)
}
l := Latency(i)
return reflect.ValueOf(l)
})
pn := []string{"10.220.0.0/24", "207.171.3.0/27"}
for _, p := range pn {
_, ipnet, err := net.ParseCIDR(p)
if err != nil {
panic(err)
}
localNets = append(localNets, ipnet)
}
}
func main() {
flag.Parse()
go beanstalkWorker()
httpHandler()
}
func beanstalkWriter() error {
bean, err := beanstalk.Dial("tcp", "127.0.0.1:11300")
if err != nil {
return fmt.Errorf("Could not connect to beanstalkd: %s", err)
}
tube := beanstalk.Tube{bean, "v6-results"}
for {
js, ok := <-beanCh
if !ok {
return fmt.Errorf("Could not read from channel")
}
_, err := tube.Put(js, 100, 0, 120*time.Second)
if err != nil {
return fmt.Errorf("Could not put job: %s", err)
}
}
}
func beanstalkWorker() {
for {
err := beanstalkWriter()
if err != nil {
log.Printf("error writing to beanstalkd: %s", err)
}
time.Sleep(2 * time.Second)
}
}
func saveHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/javascipt")
w.Header().Set("Cache-Control", "private, no-cache, no-store, must-revalidate")
w.WriteHeader(204)
err := r.ParseForm()
if err != nil {
log.Printf("Could not parse form: %s", err)
}
data := LogData{}
err = decoder.Decode(&data, r.Form)
if err != nil {
log.Printf("Could decode form: %s", err)
}
data.RemoteIP = remoteIP(r)
data.Time = time.Now().Unix()
data.Referrer = r.Header.Get("Referer")
data.UserAgent = r.Header.Get("User-Agent")
data.Host = r.Host
if idx := strings.Index(data.Host, ":"); idx > 0 {
data.Host = data.Host[0:idx]
}
js, err := json.Marshal(&data)
if err != nil {
log.Printf("Could not marshal json: %s", err)
}
pretty.Println(string(js))
beanCh <- js
}
func localNet(ip net.IP) bool {
for _, n := range localNets {
if n.Contains(ip) {
return true
}
}
return false
}
func remoteIP(r *http.Request) string {
xff := r.Header.Get("X-Forwarded-For")
if len(xff) > 0 {
ips := strings.Split(xff, ",")
for i := len(ips) - 1; i >= 0; i-- {
ip := strings.TrimSpace(ips[i])
nip := net.ParseIP(ip)
if nip != nil {
if localNet(nip) {
continue
}
return nip.String()
}
}
}
ip, _, _ := net.SplitHostPort(r.RemoteAddr)
return ip
}
func ipHandler(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
cb := r.Form.Get("callback")
if len(cb) == 0 {
w.WriteHeader(400)
return
}
ip := remoteIP(r)
defer r.Body.Close()
w.Header().Set("Content-Type", "text/javascipt")
w.Header().Set("Cache-Control", "private, no-cache, no-store, must-revalidate")
resp := []byte{}
resp = append(resp, cb...)
resp = append(resp, `({"ip":"`...)
resp = append(resp, ip...)
resp = append(resp, `"})`...)
resp = append(resp, '\n')
w.WriteHeader(200)
w.Write(resp)
}
func setupMux() *mux.Router {
r := mux.NewRouter()
r.HandleFunc("/c/ip", ipHandler)
r.HandleFunc("/c/json", saveHandler)
r.PathPrefix("/").Handler(http.FileServer(http.Dir("public/")))
return r
}
func httpHandler() {
listen := *flagip + ":" + *flaghttpport
srv := &http.Server{
Handler: handlers.CombinedLoggingHandler(os.Stdout, setupMux()),
Addr: listen,
WriteTimeout: 5 * time.Second,
ReadTimeout: 5 * time.Second,
}
log.Println("HTTP listen on", listen)
log.Fatal(srv.ListenAndServe())
}