From 19387ff91133174ada0cf0a59e8e62bc6b3cd7e4 Mon Sep 17 00:00:00 2001
From: Janus <ysangkok@gmail.com>
Date: Fri, 31 Aug 2018 18:06:11 +0200
Subject: [PATCH] aiorpcx: simplify open_session

---
 electrum/interface.py | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/electrum/interface.py b/electrum/interface.py
index ad6ea7c1b..1db430fe7 100644
--- a/electrum/interface.py
+++ b/electrum/interface.py
@@ -81,7 +81,7 @@ class Interface(PrintError):
 
     async def is_server_ca_signed(self, sslc):
         try:
-            await self.open_session(sslc, do_sleep=False)
+            await self.open_session(sslc, exit_early=True)
         except ssl.SSLError as e:
             assert e.reason == 'CERTIFICATE_VERIFY_FAILED'
             return False
@@ -90,7 +90,7 @@ class Interface(PrintError):
     @util.aiosafe
     async def run(self):
         if self.protocol != 's':
-            await self.open_session(None, execute_after_connect=self.mark_ready)
+            await self.open_session(None, exit_early=False)
             assert False
 
         ca_sslc = ssl.create_default_context(ssl.Purpose.SERVER_AUTH)
@@ -125,7 +125,7 @@ class Interface(PrintError):
         else:
             sslc = ssl.create_default_context(ssl.Purpose.SERVER_AUTH, cafile=self.cert_path)
             sslc.check_hostname = 0
-        await self.open_session(sslc, execute_after_connect=self.mark_ready)
+        await self.open_session(sslc, exit_early=False)
         assert False
 
     def mark_ready(self):
@@ -171,22 +171,21 @@ class Interface(PrintError):
         except ValueError:
             return None
 
-    async def open_session(self, sslc, do_sleep=True, execute_after_connect=lambda: None):
-        q = asyncio.Queue()
-        async with NotificationSession(None, q, self.host, self.port, ssl=sslc, proxy=self.proxy) as session:
+    async def open_session(self, sslc, exit_early):
+        header_queue = asyncio.Queue()
+        async with NotificationSession(None, header_queue, self.host, self.port, ssl=sslc, proxy=self.proxy) as session:
             ver = await session.send_request('server.version', [ELECTRUM_VERSION, PROTOCOL_VERSION])
-            self.print_error(ver, do_sleep, self.host)
-            connect_hook_executed = False
-            while do_sleep:
-                if not connect_hook_executed:
-                    connect_hook_executed = True
-                    res = await session.send_request('blockchain.headers.subscribe')
-                    self.tip_header = blockchain.deserialize_header(bfh(res['hex']), res['height'])
-                    self.tip = res['height']
-                    execute_after_connect()
-                    self.session = session
+            if exit_early:
+                return
+            self.print_error(ver, self.host)
+            subscription_res = await session.send_request('blockchain.headers.subscribe')
+            self.tip_header = blockchain.deserialize_header(bfh(subscription_res['hex']), subscription_res['height'])
+            self.tip = subscription_res['height']
+            self.mark_ready()
+            self.session = session
+            while True:
                 try:
-                    new_header = await asyncio.wait_for(q.get(), 300)
+                    new_header = await asyncio.wait_for(header_queue.get(), 300)
                     self.tip_header = new_header
                     self.tip = new_header['block_height']
                 except concurrent.futures.TimeoutError: