__init__.py 文件源码

def create_app(config_name):
    if config_name not in app_config:
        raise ConfigError("{} is a wrong config name.".format(config_name))
    app = Flask(__name__)
    app.config.from_object(app_config[config_name])

    from app.user import user_blueprint
    from app.information import info_blueprint
    from app.view import view_blueprint
    app.register_blueprint(user_blueprint)
    app.register_blueprint(info_blueprint)
    app.register_blueprint(view_blueprint)

    from app.extensions import display_plan_type, display_play, display_user, tracer_config
    jinja_env = app.jinja_env
    jinja_env.filters['plan_type'] = display_plan_type
    jinja_env.filters['plan_name'] = display_play
    jinja_env.filters['user_type'] = display_user

    db.init_app(app)
    tool_bar.init_app(app)
    login_manager.init_app(app)
    admin.init_app(app)
    if app.config.get("TRACER"):
        tracer_config.initialize_tracer()

    @app.before_request
    def init_tracer():
        import opentracing
        from app.extensions import tracer_config
        span = opentracing.tracer.start_span(str(request.url))
        span.set_tag('user_agent', request.user_agent)
        span.log_event("request args", payload=dict(args=request.args, form=request.form))
        g.tracer_span = span

    @app.after_request
    def close_tracer(response):
        if g.tracer_span:
            g.tracer_span.finish()
        return response

    return app