From a6c67501666c0fefeae8edec2c5f7755a9d24fb8 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 9 Sep 2016 13:46:05 +0100
Subject: [PATCH] Check if destination is ready for retry earlier

---
 synapse/federation/transaction_queue.py | 31 +++++++++++++------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/synapse/federation/transaction_queue.py b/synapse/federation/transaction_queue.py
index f8d3fffe9..d9b8b3fc1 100644
--- a/synapse/federation/transaction_queue.py
+++ b/synapse/federation/transaction_queue.py
@@ -192,6 +192,12 @@ class TransactionQueue(object):
                     pending_edus = self.pending_edus_by_dest.pop(destination, [])
                     pending_failures = self.pending_failures_by_dest.pop(destination, [])
 
+                    limiter = yield get_retry_limiter(
+                        destination,
+                        self.clock,
+                        self.store,
+                    )
+
                     device_message_edus, device_stream_id = (
                         yield self._get_new_device_messages(destination)
                     )
@@ -212,10 +218,18 @@ class TransactionQueue(object):
                     success = yield self._send_new_transaction(
                         destination, pending_pdus, pending_edus, pending_failures,
                         device_stream_id,
-                        should_delete_from_device_stream=bool(device_message_edus)
+                        should_delete_from_device_stream=bool(device_message_edus),
+                        limiter=limiter,
                     )
                     if not success:
                         break
+        except NotRetryingDestination:
+            logger.info(
+                "TX [%s] not ready for retry yet - "
+                "dropping transaction for now",
+                destination,
+            )
+            success = False
         finally:
             # We want to be *very* sure we delete this after we stop processing
             self.pending_transactions.pop(destination, None)
@@ -242,7 +256,7 @@ class TransactionQueue(object):
     @defer.inlineCallbacks
     def _send_new_transaction(self, destination, pending_pdus, pending_edus,
                               pending_failures, device_stream_id,
-                              should_delete_from_device_stream):
+                              should_delete_from_device_stream, limiter):
 
         # Sort based on the order field
         pending_pdus.sort(key=lambda t: t[1])
@@ -257,12 +271,6 @@ class TransactionQueue(object):
 
             txn_id = str(self._next_txn_id)
 
-            limiter = yield get_retry_limiter(
-                destination,
-                self.clock,
-                self.store,
-            )
-
             logger.debug(
                 "TX [%s] {%s} Attempting new transaction"
                 " (pdus: %d, edus: %d, failures: %d)",
@@ -359,13 +367,6 @@ class TransactionQueue(object):
                         destination, device_stream_id
                     )
                 self.last_device_stream_id_by_dest[destination] = device_stream_id
-        except NotRetryingDestination:
-            logger.info(
-                "TX [%s] not ready for retry yet - "
-                "dropping transaction for now",
-                destination,
-            )
-            success = False
         except RuntimeError as e:
             # We capture this here as there as nothing actually listens
             # for this finishing functions deferred.