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piker
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Code Issues 4 Pull Requests 6 Packages Projects Releases Wiki Activity

Try to connect to daemon once on startup; don't poll

kivy_mainline_and_py3.8
Tyler Goodlet 2018-04-22 13:27:41 -04:00
parent a2c4f0c80b
commit 482f9531ca
1 changed files with 10 additions and 23 deletions
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27
piker/cli.py
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@ -1,14 +1,10 @@
""" """
Console interface to broker client/daemons. Console interface to broker client/daemons.
""" """
from collections import defaultdict
from functools import partial from functools import partial
from importlib import import_module
from multiprocessing import Process from multiprocessing import Process
import json import json
import os import os
import signal
import time
import click import click
import pandas as pd import pandas as pd
@ -16,7 +12,7 @@ import trio
from . import watchlists as wl from . import watchlists as wl
from .brokers import core, get_brokermod from .brokers import core, get_brokermod
from .brokers.core import _daemon_main from .brokers.core import _daemon_main, Client
from .log import get_console_log, colorize_json, get_logger from .log import get_console_log, colorize_json, get_logger
log = get_logger('cli') log = get_logger('cli')
@ -135,29 +131,19 @@ def watch(loglevel, broker, rate, name):
watchlists = wl.merge_watchlist(watchlist_from_file, wl._builtins) watchlists = wl.merge_watchlist(watchlist_from_file, wl._builtins)
tickers = watchlists[name] tickers = watchlists[name]
# setup ticker stream
from .brokers.core import Client
async def main(timeout=1): async def main(timeout=1):
async def subscribe(client): async def subscribe(client):
# initial request for symbols price streams # initial request for symbols price streams
await client.send((brokermod.name, tickers)) await client.send((brokermod.name, tickers))
client = Client(('127.0.0.1', 1616), subscribe) client = Client(('127.0.0.1', 1616), subscribe)
start = time.time()
down = False
while True:
try: try:
await client.connect() await client.connect()
break
except OSError as oserr: except OSError as oserr:
if not down: await trio.sleep(0.5)
log.info("Waiting on daemon to come up...") # will raise indicating child proc should be spawned
down = True await client.connect()
await trio.sleep(0.1)
if time.time() - start > timeout:
raise
continue
async with trio.open_nursery() as nursery: async with trio.open_nursery() as nursery:
nursery.start_soon( nursery.start_soon(
@ -171,8 +157,9 @@ def watch(loglevel, broker, rate, name):
try: try:
trio.run(main) trio.run(main)
except OSError as oserr: except OSError as oserr:
log.warn("No broker daemon could be found")
log.warn(oserr) log.warn(oserr)
log.info("Spawning local broker-daemon...") log.warning("Spawning local broker-daemon...")
child = Process( child = Process(
target=run, target=run,
args=(_daemon_main, loglevel), args=(_daemon_main, loglevel),