From aa0e46f45789a236c3a6685e3c31edf8759a6da2 Mon Sep 17 00:00:00 2001
From: Matt Drollette <matt@drollette.com>
Date: Sun, 13 Jul 2014 13:26:02 -0500
Subject: [PATCH] initial

---
 reseeder.go | 153 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 reseeder.go

diff --git a/reseeder.go b/reseeder.go
new file mode 100644
index 0000000..7627be8
--- /dev/null
+++ b/reseeder.go
@@ -0,0 +1,153 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"github.com/braintree/manners"
+	"github.com/gorilla/handlers"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"sync"
+	"time"
+)
+
+var netdbDir = flag.String("dir", "./netdb", "Location of your netdb directory")
+var bindIp = flag.String("ip", "", "Interface to bind to")
+var bindPort = flag.String("port", "3000", "Port to bind to")
+
+func main() {
+	flag.Parse()
+
+	netdb := NewNetDb(*netdbDir)
+	reseeder := &Reseeder{netdb, make([]*Peer, 100)}
+
+	log.Printf("Starting server on %s:%s serving netdb from %s", *bindIp, *bindPort, *netdbDir)
+
+	server := manners.NewServer()
+
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt)
+	go func() {
+		<-c
+		log.Println("waiting for connections to close and exiting...")
+		server.Shutdown <- true
+		go time.AfterFunc(time.Duration(5)*time.Second, func() {
+			log.Println("Killing idle connections...")
+			os.Exit(0)
+		})
+	}()
+
+	err := server.ListenAndServe(*bindIp+":"+*bindPort, handlers.CombinedLoggingHandler(os.Stdout, reseeder))
+	if err != nil {
+		log.Fatal("ListenAndServe: ", err)
+	}
+}
+
+type Reseeder struct {
+	NetDb *NetDb
+	Peers []*Peer
+}
+
+func (rs *Reseeder) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	infos := make(chan *RouterInfo)
+
+	peer := &Peer{req.RemoteAddr, time.Now(), time.Now()}
+
+	go rs.GetForPeer(peer, infos)
+
+	for info := range infos {
+		fmt.Fprintf(w, "%s\n", info.Name)
+	}
+}
+
+func (rs *Reseeder) GetForPeer(peer *Peer, infos chan *RouterInfo) {
+	rs.NetDb.lock.RLock()
+	defer rs.NetDb.lock.RUnlock()
+
+	for _, info := range rs.NetDb.RouterInfos {
+		infos <- info
+	}
+	close(infos)
+}
+
+func NewNetDb(dir string) *NetDb {
+	if _, err := os.Stat(dir); err != nil {
+		if os.IsNotExist(err) {
+			log.Fatalf("netdb directory is not readable: %s", dir)
+		} else {
+			// other error
+		}
+	}
+	netdb := &NetDb{Dir: dir, RouterInfos: make(map[string]*RouterInfo, 1000)}
+	netdb.Refresh()
+
+	return netdb
+}
+
+type NetDb struct {
+	lock        sync.RWMutex
+	RouterInfos map[string]*RouterInfo
+	Dir         string
+}
+
+func (db *NetDb) Refresh() {
+	files, err := ioutil.ReadDir(db.Dir)
+	if nil != err {
+		log.Fatalf("unable to read %s", db.Dir)
+	}
+	for _, file := range files {
+		db.Set(file.Name(), NewRouterInfo(db.Dir+file.Name()))
+	}
+}
+
+func (db *NetDb) Get(key string) (*RouterInfo, bool) {
+	db.lock.RLock()
+	defer db.lock.RUnlock()
+	d, ok := db.RouterInfos[key]
+	return d, ok
+}
+
+func (db *NetDb) Set(key string, d *RouterInfo) {
+	db.lock.Lock()
+	defer db.lock.Unlock()
+	db.RouterInfos[key] = d
+}
+
+func (db *NetDb) UnSet(key string) {
+	db.lock.Lock()
+	defer db.lock.Unlock()
+	delete(db.RouterInfos, key)
+}
+
+func NewRouterInfo(file string) *RouterInfo {
+	return &RouterInfo{file}
+}
+
+type RouterInfo struct {
+	Name string
+}
+
+type Peer struct {
+	Ip      string
+	Seen    time.Time
+	Created time.Time
+}
+
+//// stuff for reverse proxy handling
+func proxiedHandler(h http.Handler) http.Handler {
+	return remoteAddrFixup{h}
+}
+
+type remoteAddrFixup struct {
+	h http.Handler
+}
+
+func (h remoteAddrFixup) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if prior, ok := r.Header["X-Forwarded-For"]; ok {
+		r.RemoteAddr = prior[0]
+	}
+	h.h.ServeHTTP(w, r)
+}