Python agent doesn't work with gevent monkey

[tmacjx]

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• Why do you submit this issue?

• Question or discussion

• Bug
  We test skyworking-py work with flask and uwsgi. When Just run with Python, it's ok
  But with uwsgi, we can't see any report log even can't find report in web page.
  When work with Gunicron with thread mode, everthing look ok.So confuse.Any one help?

• Requirement

• Feature or performance improvement

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Question

• What do you want to know?

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Bug

• Which version of SkyWalking, OS and JRE?

• Which company or project?

• What happened?
  If possible, provide a way to reproduce the error. e.g. demo application, component version.

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• Please describe your requirements or improvement suggestions.

[kezhenxu94]

We don't support uwsgi for now, contributions are welcome

[alonelaval]

@tmacjx
I used flask to test in the environment of gunicorn, it can run normally.

import requests

from skywalking import config, agent


config.service_name = 'consumer'
config.logging_level = 'DEBUG'
config.flask_collect_http_params = True
agent.start()

from flask import Flask, jsonify

app = Flask(__name__)

@app.route("/users", methods=["POST", "GET"])
def application():
    requests.post("http://github.com")

    return jsonify({"test": "hello world"})

command：gunicorn -w 4 test_gunicorn:app

when i use uwsgi --http 127.0.0.1:8000 --buffer-size=65536 --processes=4 --module test_gunicorn:app still work well，but segment report slowed。

[kezhenxu94]

@tmacjx can you share which version of Flask are you using, I suspect that it's because of version incompatible issue, now we have version-ized the plugins, and we'll come back to this issue after we determine all versions that the current plugins support, but before that if you could share more details of your case, we may get it resolved more quickly

[tmacjx]

My test demo below

from gevent import monkey
monkey.patch_all()

from skywalking import config, agent
config.service_name = 'consumer'
config.logging_level = 'DEBUG'
config.disable_plugins = 'sw_tornado'
config.init(collector='192.168.1.241:11800', service='app')
agent.start()


import requests

from flask import Flask, jsonify


app = Flask(__name__)


@app.route("/users", methods=["POST", "GET"])
def view():
    requests.post("http://baidu.com")

    return jsonify({"test": "hello world"})

thanks，you guys advice.
I think most import reason is sky-walking not support gevent mode.
When I comment gevent monkey patch_all, log show well, server start with port and report log well.
But when I use gevent mode, the server not start normal, I even change the line of gevent monkey patch_all to below of sky-walking init code, but no effect.

If we don't use gevent, The server concurrent very low, and can't use in production!
My enviroment version info:
flask 0.12
gevent 1.4.0
Python3.4 sw_tornado plugin use async which only support python3.6+, so we uninstall sw_tornado.

[kezhenxu94]

@tmacjx thanks very much for further information, we'll take a detailed look and try to support gevent mode, will update here if any progress is made

[tmacjx]

So confuse, When I run demo with gevent demo. I post a request, log show nothing, the grpc show IDEL.
But when I ctrl+c, the grpc show READY
when I ctrl + c again, the server start normal.
More detail can see in picture.

1.First Run

2. ctrl + c

3 ctr + c again

So I guess some wrong with GRPC init???