Added whisper interface for xeth, added examples, updated RPC

* Added RPC methods for whisper
* Added whisper example

xeth/whisper.go

@@ -0,0 +1,116 @@
+package xeth
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/whisper"
+)
+
+var qlogger = logger.NewLogger("XSHH")
+
+type Whisper struct {
+	*whisper.Whisper
+}
+
+func NewWhisper(w *whisper.Whisper) *Whisper {
+	return &Whisper{w}
+}
+
+func (self *Whisper) Post(payload string, to, from string, topics []string, priority, ttl uint32) error {
+	if priority == 0 {
+		priority = 1000
+	}
+
+	if ttl == 0 {
+		ttl = 100
+	}
+
+	pk := crypto.ToECDSAPub(fromHex(from))
+	if key := self.Whisper.GetIdentity(pk); key != nil || len(from) == 0 {
+		msg := whisper.NewMessage(fromHex(payload))
+		envelope, err := msg.Seal(time.Duration(priority*100000), whisper.Opts{
+			Ttl:    time.Duration(ttl) * time.Second,
+			To:     crypto.ToECDSAPub(fromHex(to)),
+			From:   key,
+			Topics: whisper.TopicsFromString(topics...),
+		})
+
+		if err != nil {
+			return err
+		}
+
+		if err := self.Whisper.Send(envelope); err != nil {
+			return err
+		}
+	} else {
+		return errors.New("unmatched pub / priv for seal")
+	}
+
+	return nil
+}
+
+func (self *Whisper) NewIdentity() string {
+	key := self.Whisper.NewIdentity()
+
+	return toHex(crypto.FromECDSAPub(&key.PublicKey))
+}
+
+func (self *Whisper) HasIdentity(key string) bool {
+	return self.Whisper.HasIdentity(crypto.ToECDSAPub(fromHex(key)))
+}
+
+func (self *Whisper) Watch(opts *Options) int {
+	filter := whisper.Filter{
+		To:     crypto.ToECDSA(fromHex(opts.To)),
+		From:   crypto.ToECDSAPub(fromHex(opts.From)),
+		Topics: whisper.TopicsFromString(opts.Topics...),
+	}
+
+	var i int
+	filter.Fn = func(msg *whisper.Message) {
+		opts.Fn(NewWhisperMessage(msg))
+	}
+	fmt.Println("new filter", filter)
+
+	i = self.Whisper.Watch(filter)
+
+	return i
+}
+
+func (self *Whisper) Messages(id int) (messages []WhisperMessage) {
+	msgs := self.Whisper.Messages(id)
+	messages = make([]WhisperMessage, len(msgs))
+	for i, message := range msgs {
+		messages[i] = NewWhisperMessage(message)
+	}
+
+	return
+}
+
+type Options struct {
+	To     string
+	From   string
+	Topics []string
+	Fn     func(msg WhisperMessage)
+}
+
+type WhisperMessage struct {
+	ref     *whisper.Message
+	Flags   int32  `json:"flags"`
+	Payload string `json:"payload"`
+	From    string `json:"from"`
+}
+
+func NewWhisperMessage(msg *whisper.Message) WhisperMessage {
+	return WhisperMessage{
+		ref:     msg,
+		Flags:   int32(msg.Flags),
+		Payload: "0x" + ethutil.Bytes2Hex(msg.Payload),
+		From:    "0x" + ethutil.Bytes2Hex(crypto.FromECDSAPub(msg.Recover())),
+	}
+}