add ipv6 testing

examples/ipv6/Dockerfile

@@ -0,0 +1,7 @@
+FROM golang
+
+WORKDIR /peerdiscovery
+COPY . .
+RUN go build -v
+
+CMD ["/peerdiscovery/ipv6"]

examples/ipv6/Makefile

@@ -0,0 +1,6 @@
+build:
+	docker build --no-cache -t peertest .
+
+run:
+	@echo "\nfollow https://docs.docker.com/config/daemon/ipv6/ to setup docker for ipv6\n\n"
+	docker run --ip6 -t --rm peertest

examples/ipv6/go.mod

@@ -0,0 +1,8 @@
+module github.com/schollz/peerdiscovery/examples/ipv6
+
+go 1.15
+
+require (
+	github.com/schollz/peerdiscovery v1.5.1
+	github.com/schollz/progressbar/v3 v3.3.5
+)

examples/ipv6/go.sum

@@ -0,0 +1,34 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213/go.mod h1:vNUNkEQ1e29fT/6vq2aBdFsgNPmy8qMdSay1npru+Sw=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
+github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
+github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/schollz/peerdiscovery v1.5.1 h1:S/tfIn7S0JO/V1VZZMWdb+bfnZdmBtL7ZsBJl6c1260=
+github.com/schollz/peerdiscovery v1.5.1/go.mod h1:hSU7N/NkfNH6AZwU/WBcDZtMABVbTfAWk/XD3XKxN+s=
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+github.com/schollz/progressbar/v2 v2.15.0/go.mod h1:UdPq3prGkfQ7MOzZKlDRpYKcFqEMczbD7YmbPgpzKMI=
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+github.com/schollz/progressbar/v3 v3.3.5/go.mod h1:8bjGbiU0YejYoWkee2ihy4wWp7yqPP6aLZ7oje0bkOI=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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examples/ipv6/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	math_rand "math/rand"
+	"time"
+
+	"github.com/schollz/peerdiscovery"
+	"github.com/schollz/progressbar/v3"
+)
+
+func main() {
+	fmt.Println("Scanning for 10 seconds to find LAN peers")
+	// show progress bar
+	go func() {
+		bar := progressbar.Default(10)
+		for i := 0; i < 10; i++ {
+			bar.Add(1)
+			time.Sleep(1 * time.Second)
+		}
+		fmt.Print("\n")
+	}()
+
+	// discover peers
+	discoveries, err := peerdiscovery.Discover(peerdiscovery.Settings{
+		Limit:     -1,
+		Payload:   []byte(randStringBytesMaskImprSrc(10)),
+		Delay:     500 * time.Millisecond,
+		TimeLimit: 10 * time.Second,
+		Notify: func(d peerdiscovery.Discovered) {
+			log.Println(d)
+		},
+		IPVersion: peerdiscovery.IPv6,
+	})
+
+	// print out results
+	if err != nil {
+		log.Fatal(err)
+	} else {
+		if len(discoveries) > 0 {
+			fmt.Printf("Found %d other computers\n", len(discoveries))
+			for i, d := range discoveries {
+				fmt.Printf("%d) '%s' with payload '%s'\n", i, d.Address, d.Payload)
+			}
+		} else {
+			fmt.Println("Found no devices. You need to run this on another computer at the same time.")
+		}
+	}
+}
+
+// src is seeds the random generator for generating random strings
+var src = math_rand.NewSource(time.Now().UnixNano())
+
+const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+const (
+	letterIdxBits = 6                    // 6 bits to represent a letter index
+	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
+	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
+)
+
+// RandStringBytesMaskImprSrc prints a random string
+func randStringBytesMaskImprSrc(n int) string {
+	b := make([]byte, n)
+	// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
+	for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
+		if remain == 0 {
+			cache, remain = src.Int63(), letterIdxMax
+		}
+		if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
+			b[i] = letterBytes[idx]
+			i--
+		}
+		cache >>= letterIdxBits
+		remain--
+	}
+
+	return string(b)
+}