Merge pull request #31 from pikers/tolerate_the_network

Tolerate the network

piker/brokers/core.py

@@ -3,6 +3,8 @@ Core broker-daemon tasks and API.
 """
 import time
 import inspect
+from functools import partial
+import socket
 from types import ModuleType
 from typing import AsyncContextManager
 
@@ -44,6 +46,21 @@ async def quote(brokermod: ModuleType, tickers: [str]) -> dict:
         return results
 
 
+async def wait_for_network(get_quotes, sleep=1):
+    """Wait until the network comes back up.
+    """
+    while True:
+        try:
+            with trio.move_on_after(1) as cancel_scope:
+                return await get_quotes()
+            if cancel_scope.cancelled_caught:
+                log.warn("Quote query timed out")
+                continue
+        except socket.gaierror:
+            log.warn(f"Network is down waiting for reestablishment...")
+            await trio.sleep(sleep)
+
+
 async def poll_tickers(
     client: 'Client',
     quoter: AsyncContextManager,
@@ -64,30 +81,35 @@ async def poll_tickers(
     async with quoter(client, tickers) as get_quotes:
         while True:  # use an event here to trigger exit?
             prequote_start = time.time()
-            quotes = await get_quotes(tickers)
+
+            with trio.move_on_after(3) as cancel_scope:
+                quotes = await get_quotes(tickers)
+
+            cancelled = cancel_scope.cancelled_caught
+            if cancelled:
+                log.warn("Quote query timed out after 3 seconds, retrying...")
+                # handle network outages by idling until response is received
+                quotes = await wait_for_network(partial(get_quotes, tickers))
+
             postquote_start = time.time()
-            payload = []
+            payload = {}
             for symbol, quote in quotes.items():
                 # FIXME: None is returned if a symbol can't be found.
                 # Consider filtering out such symbols before starting poll loop
                 if quote is None:
                     continue
 
-                if quote.get('delay', 0) > 0:
-                    log.warning(f"Delayed quote:\n{quote}")
-
                 if diff_cached:
                     # if cache is enabled then only deliver "new" changes
-                    symbol = quote['symbol']
                     last = _cache.setdefault(symbol, {})
                     new = set(quote.items()) - set(last.items())
                     if new:
                         log.info(
                             f"New quote {quote['symbol']}:\n{new}")
                         _cache[symbol] = quote
-                        payload.append(quote)
+                        payload[symbol] = quote
                 else:
-                    payload.append(quote)
+                    payload[symbol] = quote
 
             if payload:
                 q.put_nowait(payload)

piker/brokers/questrade.py

@@ -304,7 +304,24 @@ async def quoter(client: Client, tickers: [str]):
             else:
                 raise
 
-        return {quote['symbol']: quote for quote in quotes_resp['quotes']}
+        # dict packing and post-processing
+        quotes = {}
+        for quote in quotes_resp['quotes']:
+            quotes[quote['symbol']] = quote
+
+            if quote.get('delay', 0) > 0:
+                log.warning(f"Delayed quote:\n{quote}")
+
+        return quotes
+
+    first_quotes_dict = await get_quote(tickers)
+    for symbol, quote in first_quotes_dict.items():
+        if quote['low52w'] is None:
+            log.warn(f"{symbol} seems to be defunct discarding from tickers")
+            t2ids.pop(symbol)
+
+    # re-save symbol ids cache
+    ids = ','.join(map(str, t2ids.values()))
 
     yield get_quote
 

piker/ui/watchlist.py

@@ -349,10 +349,8 @@ async def update_quotes(
     grid.quote_cache = cache
 
     # initial coloring
-    for quote in first_quotes:
+    for sym, quote in first_quotes.items():
-        sym = quote['symbol']
         row = grid.symbols2rows[sym]
-        # record, displayable = qtconvert(quote, symbol_data=symbol_data)
         record, displayable = brokermod.format_quote(
             quote, symbol_data=symbol_data)
         row.update(record, displayable)
@@ -365,12 +363,11 @@ async def update_quotes(
     while True:
         log.debug("Waiting on quotes")
         quotes = await queue.get()  # new quotes data only
-        for quote in quotes:
+        for symbol, quote in quotes.items():
-            # record, displayable = qtconvert(quote, symbol_data=symbol_data)
             record, displayable = brokermod.format_quote(
                 quote, symbol_data=symbol_data)
-            row = grid.symbols2rows[record['symbol']]
+            row = grid.symbols2rows[symbol]
-            cache[record['symbol']] = (record, row)
+            cache[symbol] = (record, row)
             row.update(record, displayable)
             color_row(row, record)
 
@@ -401,11 +398,10 @@ async def _async_main(name, tickers, brokermod, rate):
             )
 
             # get first quotes response
-            pkts = await queue.get()
+            quotes = await queue.get()
             first_quotes = [
-                # qtconvert(quote, symbol_data=sd)[0] for quote in pkts]
                 brokermod.format_quote(quote, symbol_data=sd)[0]
-                for quote in pkts]
+                for quote in quotes.values()]
 
             if first_quotes[0].get('last') is None:
                 log.error("Broker API is down temporarily")
@@ -463,4 +459,4 @@ async def _async_main(name, tickers, brokermod, rate):
             }
             nursery.start_soon(run_kivy, widgets['root'], nursery)
             nursery.start_soon(
-                update_quotes, brokermod, widgets, queue, sd, pkts)
+                update_quotes, brokermod, widgets, queue, sd, quotes)