Add examples

examples/main.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"context"
+	"log"
+	"sync"
+
+	"github.com/cs3238-tsuzu/go-easyp2p"
+)
+
+func main() {
+	a, b := make(chan string, 1), make(chan string, 1)
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	defer wg.Wait()
+	go func(send, recv chan string) {
+		defer wg.Done()
+
+		p2p := easyp2p.NewP2PConn([]string{"stun.l.google.com:19302"})
+		defer p2p.Close()
+
+		if least, err := p2p.DiscoverIP(); err != nil {
+			log.Println(err)
+
+			if !least {
+				return
+			}
+		}
+
+		if desc, err := p2p.LocalDescription(); err != nil {
+			panic(err)
+		} else {
+			a <- desc
+			log.Println(desc)
+		}
+
+		log.Println("connecting")
+		if err := p2p.Connect(context.Background(), <-b); err != nil {
+			log.Println(err)
+
+			return
+		}
+
+		log.Println("connected")
+
+		b := make([]byte, 1024)
+		n, err := p2p.Read(b)
+
+		log.Println(string(b[:n]))
+
+		if err != nil {
+			log.Println(err)
+
+			return
+		}
+	}(a, b)
+
+	func(send, recv chan string) {
+		p2p := easyp2p.NewP2PConn([]string{"stun.l.google.com:19302"})
+		defer p2p.Close()
+
+		if least, err := p2p.DiscoverIP(); err != nil {
+			log.Println(err)
+
+			if !least {
+				return
+			}
+		}
+
+		if desc, err := p2p.LocalDescription(); err != nil {
+			panic(err)
+		} else {
+			b <- desc
+			log.Println(desc)
+		}
+
+		log.Println("connecting")
+		if err := p2p.Connect(context.Background(), <-a); err != nil {
+			log.Println("connect error", err)
+		}
+		log.Println("successfully connected")
+
+		if _, err := p2p.Write([]byte(`Hello, world!`)); err != nil {
+			log.Println(err)
+
+			return
+		}
+	}(b, a)
+}