# ------------------
# Only for running this script here
import asyncio
import logging
import sys
from os.path import dirname
sys.path.insert(1, f"{dirname(__file__)}/../../..")
logging.basicConfig(level=logging.DEBUG)
# ------------------
# ---------------------
# Flask App
# ---------------------
# pip3 install flask
from flask import Flask, make_response
app = Flask(__name__)
logger = logging.getLogger(__name__)
import os
from slack import WebClient
from slack.errors import SlackApiError
singleton_client = WebClient(token=os.environ["SLACK_BOT_TOKEN"], run_async=False)
singleton_loop = asyncio.new_event_loop()
singleton_async_client = WebClient(
token=os.environ["SLACK_BOT_TOKEN"],
run_async=True,
loop=singleton_loop
)
# Fixed in 2.6.0: This doesn't work
@app.route("/sync/singleton", methods=["GET"])
def singleton():
try:
# blocking here!!!
# as described at https://github.com/slackapi/python-slackclient/issues/497
# until this completion, other simultaneous requests get "RuntimeError: This event loop is already running"
response = singleton_client.chat_postMessage(
channel="#random",
text="You used the singleton WebClient for posting this message!"
)
return str(response)
except SlackApiError as e:
return make_response(str(e), 400)
@app.route("/sync/per-request", methods=["GET"])
def per_request():
try:
client = WebClient(
token=os.environ["SLACK_BOT_TOKEN"],
run_async=False
)
response = client.chat_postMessage(
channel="#random",
text="You used a new WebClient for posting this message!"
)
return str(response)
except SlackApiError as e:
return make_response(str(e), 400)
# This doesn't work
@app.route("/async/singleton", methods=["GET"])
def singleton_async():
try:
future = singleton_async_client.chat_postMessage(
channel="#random",
text="You used the singleton WebClient for posting this message!"
)
# blocking here!!!
# as described at https://github.com/slackapi/python-slackclient/issues/497
# until this completion, other simultaneous requests get "RuntimeError: This event loop is already running"
response = singleton_loop.run_until_complete(future)
return str(response)
except SlackApiError as e:
return make_response(str(e), 400)
@app.route("/async/per-request", methods=["GET"])
def per_request_async():
try:
# This is not optimal and the host should have a large number of FD (File Descriptor)
loop_for_this_request = asyncio.new_event_loop()
async_client = WebClient(
token=os.environ["SLACK_BOT_TOKEN"],
run_async=True,
loop=loop_for_this_request
)
future = async_client.chat_postMessage(
channel="#random",
text="You used the singleton WebClient for posting this message!"
)
response = loop_for_this_request.run_until_complete(future)
return str(response)
except SlackApiError as e:
return make_response(str(e), 400)
if __name__ == "__main__":
# export FLASK_ENV=development
# python3 integration_tests/samples/issues/issue_497.py
app.run(debug=True, host="localhost", port=3000)
