Notify when a chunk of headers is validated

And a couple of cosmetic changes.
This should fix #1379.

lib/network.py

@@ -590,6 +590,7 @@ class Network(util.DaemonThread):
                 # If not finished, get the next chunk
                 if idx < 0 or self.get_local_height() >= data['if_height']:
                     self.bc_requests.popleft()
+                    self.notify('updated')
                 else:
                     self.request_chunk(interface, data, idx)
 

lib/synchronizer.py

@@ -128,7 +128,8 @@ class WalletSynchronizer():
             return
         self.wallet.receive_tx_callback(tx_hash, tx, tx_height)
         self.requested_tx.remove((tx_hash, tx_height))
-        self.print_error("received tx:", tx_hash, len(tx.raw))
+        self.print_error("received tx %s height: %d bytes: %d" %
+                         (tx_hash, tx_height, len(tx.raw)))
         # callbacks
         self.network.trigger_callback('new_transaction', (tx,))
         if not self.requested_tx:

lib/verifier.py

@@ -40,9 +40,9 @@ class SPV(util.DaemonThread):
         while self.is_running():
             unverified = self.wallet.get_unverified_txs()
             for (tx_hash, tx_height) in unverified:
-                if self.merkle_roots.get(tx_hash) is None and tx_hash not in requested_merkle:
+                if tx_hash not in self.merkle_roots and tx_hash not in requested_merkle:
                     if self.network.send([ ('blockchain.transaction.get_merkle',[tx_hash, tx_height]) ], self.queue.put):
-                        self.print_error('requesting merkle', tx_hash)
+                        self.print_error('requested merkle', tx_hash)
                         requested_merkle.add(tx_hash)
             try:
                 r = self.queue.get(timeout=0.1)