refactor announceHaveBlob

-add cached `token` to Contact objects to minimize findValue requests
-remove self_store, always store to remote contacts even if we're the closest known node to the hash
-move the store call and error handling from announceHaveBlob to a smaller function of its own

lbrynet/dht/contact.py

@@ -35,6 +35,15 @@ class _Contact(object):
         self.lastReplied = None
         self.lastRequested = None
         self.protocolVersion = constants.protocolVersion
+        self._token = (None, 0)  # token, timestamp
+
+    def update_token(self, token):
+        self._token = token, self.getTime()
+
+    @property
+    def token(self):
+        # expire the token 1 minute early to be safe
+        return self._token[0] if self._token[1] + 240 > self.getTime() else None
 
     @property
     def lastInteracted(self):

lbrynet/dht/node.py

@@ -304,34 +304,17 @@ class Node(MockKademliaHelper):
         return self._routingTable.bucketsWithContacts()
 
     @defer.inlineCallbacks
-    def announceHaveBlob(self, blob_hash):
-        known_nodes = {}
-        contacts = yield self.iterativeFindNode(blob_hash)
-        # store locally if we're the closest node and there are less than k contacts to try storing to
-        if self.externalIP is not None and contacts and len(contacts) < constants.k:
-            is_closer = Distance(blob_hash).is_closer(self.node_id, contacts[-1].id)
-            if is_closer:
-                contacts.pop()
-                self_contact = self.contact_manager.make_contact(self.node_id, self.externalIP,
-                                                                 self.port, self._protocol)
-                token = self.make_token(self_contact.compact_ip())
-                yield self.store(self_contact, blob_hash, token, self.peerPort, self.node_id, 0)
-        elif self.externalIP is not None:
-            pass
-        else:
-            raise Exception("Cannot determine external IP: %s" % self.externalIP)
-
-        contacted = []
-
-        @defer.inlineCallbacks
-        def announce_to_contact(contact):
-            known_nodes[contact.id] = contact
+    def storeToContact(self, blob_hash, contact):
         try:
-                response = yield contact.findValue(blob_hash)
-                res = yield contact.store(blob_hash, response['token'], self.peerPort, self.node_id, 0)
+            token = contact.token
+            if not token:
+                find_value_response = yield contact.findValue(blob_hash)
+                token = find_value_response['token']
+                contact.update_token(token)
+            res = yield contact.store(blob_hash, token, self.peerPort, self.node_id, 0)
             if res != "OK":
                 raise ValueError(res)
-                contacted.append(contact)
+            defer.returnValue(True)
             log.debug("Stored %s to %s (%s)", binascii.hexlify(blob_hash), contact.log_id(), contact.address)
         except protocol.TimeoutError:
             log.debug("Timeout while storing blob_hash %s at %s",
@@ -341,17 +324,20 @@ class Node(MockKademliaHelper):
         except Exception as err:
             log.error("Unexpected error while storing blob_hash %s at %s: %s",
                       binascii.hexlify(blob_hash), contact, err)
+        defer.returnValue(False)
 
-        dl = []
-        for c in contacts:
-            dl.append(announce_to_contact(c))
-
-        yield defer.DeferredList(dl)
+    @defer.inlineCallbacks
+    def announceHaveBlob(self, blob_hash):
+        contacts = yield self.iterativeFindNode(blob_hash)
 
+        if not self.externalIP:
+            raise Exception("Cannot determine external IP: %s" % self.externalIP)
+        stored_to = yield DeferredDict({contact: self.storeToContact(blob_hash, contact) for contact in contacts})
+        contacted_node_ids = map(
+            lambda contact: contact.id.encode('hex'), filter(lambda contact: stored_to[contact], stored_to.keys())
+        )
         log.debug("Stored %s to %i of %i attempted peers", binascii.hexlify(blob_hash),
-                  len(contacted), len(contacts))
-
-        contacted_node_ids = [c.id.encode('hex') for c in contacted]
+                  len(contacted_node_ids), len(contacts))
         defer.returnValue(contacted_node_ids)
 
     def change_token(self):