Merge branch 'develop' of github.com-obscure:ethereum/go-ethereum into develop

Conflicts:
	rpc/api.go

xeth/xeth.go

@@ -97,7 +97,7 @@ done:
 			}
 
 			for id, filter := range self.messages {
-				if time.Since(filter.timeout) > filterTickerTime {
+				if time.Since(filter.activity()) > filterTickerTime {
 					self.Whisper().Unwatch(id)
 					delete(self.messages, id)
 				}
@@ -456,35 +456,61 @@ func (self *XEth) AllLogs(earliest, latest int64, skip, max int, address []strin
 	return filter.Find()
 }
 
-func (p *XEth) NewWhisperFilter(opts *Options) int {
+// NewWhisperFilter creates and registers a new message filter to watch for
+// inbound whisper messages. All parameters at this point are assumed to be
+// HEX encoded.
+func (p *XEth) NewWhisperFilter(to, from string, topics [][]string) int {
+	// Pre-define the id to be filled later
 	var id int
-	opts.Fn = func(msg WhisperMessage) {
-		p.messagesMut.Lock()
-		defer p.messagesMut.Unlock()
-		p.messages[id].add(msg) // = append(p.messages[id], msg)
+
+	// Callback to delegate core whisper messages to this xeth filter
+	callback := func(msg WhisperMessage) {
+		p.messagesMut.RLock() // Only read lock to the filter pool
+		defer p.messagesMut.RUnlock()
+		p.messages[id].insert(msg)
 	}
-	id = p.Whisper().Watch(opts)
-	p.messages[id] = &whisperFilter{timeout: time.Now()}
+	// Initialize the core whisper filter and wrap into xeth
+	id = p.Whisper().Watch(to, from, topics, callback)
+
+	p.messagesMut.Lock()
+	p.messages[id] = newWhisperFilter(id, p.Whisper())
+	p.messagesMut.Unlock()
+
 	return id
 }
 
+// UninstallWhisperFilter disables and removes an existing filter.
 func (p *XEth) UninstallWhisperFilter(id int) bool {
+	p.messagesMut.Lock()
+	defer p.messagesMut.Unlock()
+
 	if _, ok := p.messages[id]; ok {
 		delete(p.messages, id)
 		return true
 	}
-
 	return false
 }
 
-func (self *XEth) MessagesChanged(id int) []WhisperMessage {
-	self.messagesMut.Lock()
-	defer self.messagesMut.Unlock()
+// WhisperMessages retrieves all the known messages that match a specific filter.
+func (self *XEth) WhisperMessages(id int) []WhisperMessage {
+	self.messagesMut.RLock()
+	defer self.messagesMut.RUnlock()
 
 	if self.messages[id] != nil {
-		return self.messages[id].get()
+		return self.messages[id].messages()
 	}
+	return nil
+}
 
+// WhisperMessagesChanged retrieves all the new messages matched by a filter
+// since the last retrieval
+func (self *XEth) WhisperMessagesChanged(id int) []WhisperMessage {
+	self.messagesMut.RLock()
+	defer self.messagesMut.RUnlock()
+
+	if self.messages[id] != nil {
+		return self.messages[id].retrieve()
+	}
 	return nil
 }
 
@@ -735,22 +761,6 @@ func (m callmsg) Gas() *big.Int                 { return m.gas }
 func (m callmsg) Value() *big.Int               { return m.value }
 func (m callmsg) Data() []byte                  { return m.data }
 
-type whisperFilter struct {
-	messages []WhisperMessage
-	timeout  time.Time
-	id       int
-}
-
-func (w *whisperFilter) add(msgs ...WhisperMessage) {
-	w.messages = append(w.messages, msgs...)
-}
-func (w *whisperFilter) get() []WhisperMessage {
-	w.timeout = time.Now()
-	tmp := w.messages
-	w.messages = nil
-	return tmp
-}
-
 type logFilter struct {
 	logs    state.Logs
 	timeout time.Time