如何同时运行 kivy 和烧瓶应用程序?

How to run kivy and flask apps together?(如何同时运行 kivy 和烧瓶应用程序?)

问题描述

我有一个烧瓶应用程序作为服务器，我有一个 kivy 应用程序作为服务器的前端.如何运行烧瓶然后运行 ​​kivy 应用程序以便它们同时协同工作?

I have a flask app serving as a server and I have a kivy app serving as a front end to a server. How can I run flask and then kivy app so they work together at the same time?

Flask 应用:

from flask import Flask

app = Flask(__name__)


@app.route('/')
def hello():
    return 'Hello'

if __name__ == "__main__":
    app.run()

Kivy 应用:

from kivy.app import App
from kivy.builder import Builder
from kivy.uix.screenmanager import Screen, ScreenManager
kivy.require('1.10.0')

Builder.load_file('kivy.kv')

sm = ScreenManager()

class MainScreen(Screen)
    pass

class OtherScreen(Screen)
    pass

sm.add_widget(MainScreen(name='main'))
sm.add_widget(OtherScreen(name='other'))

class MyApp(App):
    def build(self):
        return sm


MyApp().run()

更新:如果有人在使用 apache 实现网络服务器时遇到问题，请尝试 docker，我认为这是一种更简单、更快的解决方案！

Update: If someone is having problems implementing a webserver with apache, try docker, simpler and faster solution, in my opinion!

推荐答案

我想让 Flask 连续运行.我尝试了建议的解决方案，按照@amanb 的建议将它们作为线程一起运行.我发现 Flask 正在阻塞 Kivy，反之亦然，无论线程的时间安排或排列方式如何.原因是解释器的 GIL.因此，我尝试了流程，似乎它确实有效.

I wanted Flask to run continuously. I tried the proposed solution to run them together as threads as suggested by @amanb. I found out Flask is blocking Kivy and vice versa no matter the timing or how arranged are the threads. The reason being the interpreter's GIL. Therefore I tried with processes and it seems it does the work.

代码

#!/usr/bin/python2.7 python2.7
# -*- coding: utf-8 -*-

# kivy modules first, if not Kivy may cause problems
import kivy
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.label import Label
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.screenmanager import ScreenManager, Screen
kivy.require('1.10.0')


# common modules
import sys
import signal
from multiprocessing import Process


# Flask & similar modules
from flask import Flask
from flask_restful import reqparse, abort, Api, Resource
import eventlet
from eventlet import wsgi


# async server setup
app = Flask(__name__)
api = Api(app)


def start_Flask():
    print("Starting server...")
    # start an eventlet WSGI server on port 5000
    wsgi.server(eventlet.listen(('', 5000)), app)     


def signal_handler(signal, frame):
    # for fetching CTRL+C and relatives
    print " CTRL + C detected, exiting ... "
    exit(1)


# Kivy screen class
class MainScreen(Screen):
    def __init__(self, **kwargs):
        self.name="MAIN SCREEN"
        super(Screen, self).__init__(**kwargs)


# Kivy app class
class Kivy(App):
    w_MessageBox10_1 = "MAIN SCREEN"
    w_MessageBox10_2 = "One golden glance of what should be"
    w_MessageBox30_2 = "CHORUS"
    w_MessageBox30_3 = "EXIT"


    # exit button action   
    def exit(self):
        print "exiting... one shaft of light will show the way..."
        p1.terminate()  # terminate Flask by pressing on cancel
        exit(1)


    # do magic button action
    def do_magic(self):
        # your code goes here or maybe not
        print "***** it's a kind of magic *************************"


    # Kivy UI builder file
    def build(self):
        sm = Builder.load_string("""

ScreenManager
    MainScreen:
        size_hint: 1, .7
        auto_dismiss: False
        title: app.w_MessageBox10_1       
        title_align: "center"

        BoxLayout:
            orientation: "vertical"
            Label:
                text: app.w_MessageBox10_2
            BoxLayout:
                orientation: "horizontal"
                spacing: 10
                size_hint: 1, .5
                Button:
                    text: app.w_MessageBox30_2  # DO MAGIC
                    on_press:
                        app.do_magic()
                Button:
                    text: app.w_MessageBox30_3  # EXIT
                    on_press:
                        app.exit()


        """)

        return sm


if __name__ == '__main__':    

    # #CTRL+C signal handler
    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGTERM, signal_handler)

    global p1
    p1 = Process(target=start_Flask)    # assign Flask to a process
    p1.start()                          # run Flask as process
    Kivy().run()                        # run Kivy UI

更新要通过在 Kivy 中按下按钮来按需运行 Flask，我使用下面的脚本.

UPDATE To run Flask on demand by pressing a button in Kivy I use the script below.

#!/usr/bin/python2.7 python2.7
# -*- coding: utf-8 -*-

# kivy modules first, if not Kivy may cause problems
import kivy
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.label import Label
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.screenmanager import ScreenManager, Screen
kivy.require('1.10.0')

# common modules
import sys
import os
import time
import signal
from multiprocessing import Process

# Flask modules
from flask import Flask

# wsgi (Web Server Gateway Interface) modules
import eventlet
from eventlet import wsgi

# async server setup
app = Flask(__name__)

def signal_handler(signal, frame):
    print " CTRL + C detected, exiting ... "
    exit(0)


# kivy gui classes ######################################################     
class MainScreen(Screen):
    def __init__(self, **kwargs):
        self.name="MAIN SCREEN"
        super(Screen, self).__init__(**kwargs)

class MainApp(App):
    MainScreenTitle = "MainScreen title"
    MainScreenLabel = "MainScreen label"
    MessageButtonEnter = "START"
    MessageButtonExit = "EXIT"

    def start_Flask(self):
        print("Starting Flask...")
        wsgi.server(eventlet.listen(('', 5000)), app)     # deploy as an eventlet WSGI server

    def stop(self):
        print "terminating Flask and exiting..."
        global p1
        p1.terminate()
        exit(1)

    def start(self):
        print "starting Flask as process..."
        global p1
        p1 = Process(target=self.start_Flask) # assign Flask to a process
        p1.daemon = True
        p1.start()  #launch Flask as separate process

    def build(self):
        sm = Builder.load_string("""

ScreenManager
    MainScreen:
        size_hint: 1, .7
        auto_dismiss: False
        title: app.MainScreenTitle       
        title_align: "center"

        BoxLayout:
            orientation: "vertical"
            Label:
                text: app.MainScreenLabel
            BoxLayout:
                orientation: "horizontal"
                spacing: 10
                size_hint: 1, .5
                Button:
                    text: app.MessageButtonEnter  # start app
                    on_press:
                        app.start()
                Button:
                    text: app.MessageButtonExit  # exit app
                    on_press:
                        app.stop()

        """)

        return sm


# main ################################################
if __name__ == '__main__':

    #CTRL+C signal handler
    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGTERM, signal_handler)

    MainApp().run()   # run Kivy app

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