From b8c16d8ac5bad777b4596cc50ae47c870fa4fe09 Mon Sep 17 00:00:00 2001
From: Jack Robison <jackrobison@lbry.io>
Date: Tue, 8 Dec 2020 12:45:45 -0500
Subject: [PATCH 1/2] fix mempool txs being re-requested with each address
 notification

---
 lbry/wallet/ledger.py         | 23 +++++++++++------------
 lbry/wallet/server/session.py |  2 +-
 2 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/lbry/wallet/ledger.py b/lbry/wallet/ledger.py
index b9487aeba..d30d018e7 100644
--- a/lbry/wallet/ledger.py
+++ b/lbry/wallet/ledger.py
@@ -513,7 +513,6 @@ class Ledger(metaclass=LedgerRegistry):
                 return True
 
             acquire_lock_tasks = []
-            synced_txs = []
             to_request = {}
             pending_synced_history = {}
             updated_cached_items = {}
@@ -531,9 +530,16 @@ class Ledger(metaclass=LedgerRegistry):
                     cache_item = TransactionCacheItem()
                     self._tx_cache[txid] = cache_item
 
+            unsynced_offset = already_synced_offset
             for txid, remote_height in remote_history[already_synced_offset:]:
                 cache_item = self._tx_cache[txid]
-                acquire_lock_tasks.append(asyncio.create_task(cache_item.lock.acquire()))
+                if cache_item.tx is not None and cache_item.tx.height >= remote_height \
+                        and (not cache_item.tx.is_verified or remote_height < 1):
+                    pending_synced_history[unsynced_offset] = f'{txid}:{cache_item.tx.height}:'
+                    already_synced.add((txid, cache_item.tx.height))
+                else:
+                    acquire_lock_tasks.append(asyncio.create_task(cache_item.lock.acquire()))
+                unsynced_offset += 1
 
             if acquire_lock_tasks:
                 await asyncio.wait(acquire_lock_tasks)
@@ -550,23 +556,16 @@ class Ledger(metaclass=LedgerRegistry):
 
                 assert cache_item is not None, 'cache item is none'
                 assert cache_item.lock.locked(), 'cache lock is not held?'
-                # tx = cache_item.tx
-                # if cache_item.tx is not None and \
-                #      cache_item.tx.height >= remote_height and \
-                #      (cache_item.tx.is_verified or remote_height < 1):
-                #     synced_txs.append(cache_item.tx)  # cached tx is already up-to-date
-                #     pending_synced_history[i] = f'{tx.id}:{tx.height}:'
-                #     continue
+
                 to_request[i] = (txid, remote_height)
 
             log.debug(
-                "request %i transactions, %i/%i for %s are already synced", len(to_request), len(synced_txs),
-                len(remote_history), address
+                "request %i transactions, %i/%i for %s are already synced", len(to_request),
+                len(pending_synced_history), len(remote_history), address
             )
             requested_txes = await self._request_transaction_batch(to_request, len(remote_history), address)
             for tx in requested_txes:
                 pending_synced_history[tx_indexes[tx.id]] = f"{tx.id}:{tx.height}:"
-                synced_txs.append(tx)
 
             assert len(pending_synced_history) == len(remote_history), \
                 f"{len(pending_synced_history)} vs {len(remote_history)}"
diff --git a/lbry/wallet/server/session.py b/lbry/wallet/server/session.py
index fd7477c6b..0a996d68e 100644
--- a/lbry/wallet/server/session.py
+++ b/lbry/wallet/server/session.py
@@ -651,7 +651,7 @@ class SessionManager:
             ]
             if header_tasks:
                 self.logger.info(f'notify {len(header_tasks)} sessions of new header')
-                await asyncio.wait(header_tasks)
+                asyncio.create_task(asyncio.wait(header_tasks))
             for hashX in touched.intersection(self.mempool_statuses.keys()):
                 self.mempool_statuses.pop(hashX, None)
 

From 8da73ad3dd7756ad4b5ccdfefb1a3e2a38ac5564 Mon Sep 17 00:00:00 2001
From: Jack Robison <jackrobison@lbry.io>
Date: Tue, 8 Dec 2020 14:42:28 -0500
Subject: [PATCH 2/2] improve hash_to_hex_str performance

---
 lbry/wallet/server/hash.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lbry/wallet/server/hash.py b/lbry/wallet/server/hash.py
index a1a5d8068..2c0201952 100644
--- a/lbry/wallet/server/hash.py
+++ b/lbry/wallet/server/hash.py
@@ -67,17 +67,17 @@ def hash160(x):
     return ripemd160(sha256(x))
 
 
-def hash_to_hex_str(x):
+def hash_to_hex_str(x: bytes) -> str:
     """Convert a big-endian binary hash to displayed hex string.
 
     Display form of a binary hash is reversed and converted to hex.
     """
-    return bytes(reversed(x)).hex()
+    return x[::-1].hex()
 
 
-def hex_str_to_hash(x):
+def hex_str_to_hash(x: str) -> bytes:
     """Convert a displayed hex string to a binary hash."""
-    return bytes(reversed(hex_to_bytes(x)))
+    return hex_to_bytes(x)[::-1]
 
 
 class Base58Error(Exception):