start making Sammy into something kind of reusable

sammy/sammy.go

@@ -6,15 +6,43 @@ import (
 	"os"
 )
 
-func Sammy() (*sam3.StreamListener, error) {
-	if sam, err := sam3.NewSAM("127.0.0.1:7656"); err != nil {
+func RandStringBytes() string {
+	letterBytes := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	b := make([]byte, 4)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	return string(b)
+}
+
+func Sammy(opts map[string]string) (*sam3.StreamListener, error) {
+	sam := ""
+	keypath := ""
+	servertun := ""
+	if opts != nil {
+		if ok, _ := opts[`sam`]; !ok {
+			opts[`sam`] = "127.0.0.1:7656"
+		}
+		if ok, _ := opts[`keypath`]; !ok {
+			opts[`keypath`] = "keys.i2pkeys"
+		}
+		if ok, _ := opts[`servertun`]; !ok {
+			opts[`servertun`] = "serv" + randStringBytes()
+		}
+	} else {
+		opts := make(map[string]string)
+		opts[`sam`] = "127.0.0.1:7656"
+		opts[`keypath`] = "keys.i2pkeys"
+		opts[`servertun`] = "serv" + randStringBytes()
+	}
+	if sam, err := sam3.NewSAM(opts[`sam`]); err != nil {
 		return nil, err
 	} else {
-		if file, err := os.Open("../keys.i2pkeys"); err == nil {
+		if file, err := os.Open(opt[`keypath`]); err == nil {
 			if keys, err := i2pkeys.LoadKeysIncompat(file); err != nil {
 				return nil, err
 			} else {
-				if stream, err := sam.NewStreamSession("serverTun", keys, sam3.Options_Fat); err != nil {
+				if stream, err := sam.NewStreamSession(opt[`servertun`], keys, sam3.Options_Fat); err != nil {
 					return nil, err
 				} else {
 					return stream.Listen()
@@ -24,13 +52,13 @@ func Sammy() (*sam3.StreamListener, error) {
 			if keys, err := sam.NewKeys(); err != nil {
 				return nil, err
 			} else {
-				if file, err := os.Create("../keys.i2pkeys"); err != nil {
+				if file, err := os.Create(opt[`keypath`]); err != nil {
 					return nil, err
 				} else {
 					if err := i2pkeys.StoreKeysIncompat(keys, file); err != nil {
 						return nil, err
 					}
-					if stream, err := sam.NewStreamSession("serverTun", keys, sam3.Options_Fat); err != nil {
+					if stream, err := sam.NewStreamSession(opt[`servertun`], keys, sam3.Options_Fat); err != nil {
 						return nil, err
 					} else {
 						return stream.Listen()