flask.ctx has_app_context Example Code

has_app_context is a callable within the flask.ctx module of the Flask project.

Example 1 from flask-restx

Flask RESTX is an extension that makes it easier to build RESTful APIs into your applications. Flask RESTX aims for minimal configuration to get basic APIs running for existing applications and it exposes endpoint documentation using Swagger.

Flask RESTX is provided as open source under the BSD 3-Clause license.

flask-restx / flask_restx / marshalling.py

# marshalling.py
from __future__ import unicode_literals

from collections import OrderedDict
from functools import wraps
from six import iteritems

from flask import request, current_app, has_app_context

from .mask import Mask, apply as apply_mask
from .utils import unpack

def make(cls):
    if isinstance(cls, type):
        return cls()
    return cls

def marshal(data, fields, envelope=None, skip_none=False, mask=None, ordered=False):
    out, has_wildcards = _marshal(data, fields, envelope, skip_none, mask, ordered)

    if has_wildcards:
        from .fields import Wildcard

        items = []
        keys = []
        for dkey, val in fields.items():
            key = dkey
            if isinstance(val, dict):
                value = marshal(data, val, skip_none=skip_none, ordered=ordered)

## ... source file abbreviated to get to has_app_context examples ...

    out = OrderedDict(items) if ordered else dict(items)

    if envelope:
        out = OrderedDict([(envelope, out)]) if ordered else {envelope: out}

    return out, has_wildcards["present"]

class marshal_with(object):

    def __init__(
        self, fields, envelope=None, skip_none=False, mask=None, ordered=False
        self.fields = fields
        self.envelope = envelope
        self.skip_none = skip_none
        self.ordered = ordered
        self.mask = Mask(mask, skip=True)

    def __call__(self, f):
        def wrapper(*args, **kwargs):
            resp = f(*args, **kwargs)
            mask = self.mask
            if has_app_context():
                mask_header = current_app.config["RESTX_MASK_HEADER"]
                mask = request.headers.get(mask_header) or mask
            if isinstance(resp, tuple):
                data, code, headers = unpack(resp)
                return (
                return marshal(
                    resp, self.fields, self.envelope, self.skip_none, mask, self.ordered

        return wrapper

## ... source file continues with no further has_app_context examples...

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