bazarr/libs/flask_restx/marshalling.py

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# -*- coding: utf-8 -*-
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):
"""Takes raw data (in the form of a dict, list, object) and a dict of
fields to output and filters the data based on those fields.
:param data: the actual object(s) from which the fields are taken from
:param fields: a dict of whose keys will make up the final serialized
response output
:param envelope: optional key that will be used to envelop the serialized
response
:param bool skip_none: optional key will be used to eliminate fields
which value is None or the field's key not
exist in data
:param bool ordered: Wether or not to preserve order
>>> from flask_restx import fields, marshal
>>> data = { 'a': 100, 'b': 'foo', 'c': None }
>>> mfields = { 'a': fields.Raw, 'c': fields.Raw, 'd': fields.Raw }
>>> marshal(data, mfields)
{'a': 100, 'c': None, 'd': None}
>>> marshal(data, mfields, envelope='data')
{'data': {'a': 100, 'c': None, 'd': None}}
>>> marshal(data, mfields, skip_none=True)
{'a': 100}
>>> marshal(data, mfields, ordered=True)
OrderedDict([('a', 100), ('c', None), ('d', None)])
>>> marshal(data, mfields, envelope='data', ordered=True)
OrderedDict([('data', OrderedDict([('a', 100), ('c', None), ('d', None)]))])
>>> marshal(data, mfields, skip_none=True, ordered=True)
OrderedDict([('a', 100)])
"""
out, has_wildcards = _marshal(data, fields, envelope, skip_none, mask, ordered)
if has_wildcards:
# ugly local import to avoid dependency loop
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)
else:
field = make(val)
is_wildcard = isinstance(field, Wildcard)
# exclude already parsed keys from the wildcard
if is_wildcard:
field.reset()
if keys:
field.exclude |= set(keys)
keys = []
value = field.output(dkey, data, ordered=ordered)
if is_wildcard:
def _append(k, v):
if skip_none and (v is None or v == OrderedDict() or v == {}):
return
items.append((k, v))
key = field.key or dkey
_append(key, value)
while True:
value = field.output(dkey, data, ordered=ordered)
if value is None or value == field.container.format(
field.default
):
break
key = field.key
_append(key, value)
continue
keys.append(key)
if skip_none and (value is None or value == OrderedDict() or value == {}):
continue
items.append((key, value))
items = tuple(items)
out = OrderedDict(items) if ordered else dict(items)
if envelope:
out = OrderedDict([(envelope, out)]) if ordered else {envelope: out}
return out
return out
def _marshal(data, fields, envelope=None, skip_none=False, mask=None, ordered=False):
"""Takes raw data (in the form of a dict, list, object) and a dict of
fields to output and filters the data based on those fields.
:param data: the actual object(s) from which the fields are taken from
:param fields: a dict of whose keys will make up the final serialized
response output
:param envelope: optional key that will be used to envelop the serialized
response
:param bool skip_none: optional key will be used to eliminate fields
which value is None or the field's key not
exist in data
:param bool ordered: Wether or not to preserve order
>>> from flask_restx import fields, marshal
>>> data = { 'a': 100, 'b': 'foo', 'c': None }
>>> mfields = { 'a': fields.Raw, 'c': fields.Raw, 'd': fields.Raw }
>>> marshal(data, mfields)
{'a': 100, 'c': None, 'd': None}
>>> marshal(data, mfields, envelope='data')
{'data': {'a': 100, 'c': None, 'd': None}}
>>> marshal(data, mfields, skip_none=True)
{'a': 100}
>>> marshal(data, mfields, ordered=True)
OrderedDict([('a', 100), ('c', None), ('d', None)])
>>> marshal(data, mfields, envelope='data', ordered=True)
OrderedDict([('data', OrderedDict([('a', 100), ('c', None), ('d', None)]))])
>>> marshal(data, mfields, skip_none=True, ordered=True)
OrderedDict([('a', 100)])
"""
# ugly local import to avoid dependency loop
from .fields import Wildcard
mask = mask or getattr(fields, "__mask__", None)
fields = getattr(fields, "resolved", fields)
if mask:
fields = apply_mask(fields, mask, skip=True)
if isinstance(data, (list, tuple)):
out = [marshal(d, fields, skip_none=skip_none, ordered=ordered) for d in data]
if envelope:
out = OrderedDict([(envelope, out)]) if ordered else {envelope: out}
return out, False
has_wildcards = {"present": False}
def __format_field(key, val):
field = make(val)
if isinstance(field, Wildcard):
has_wildcards["present"] = True
value = field.output(key, data, ordered=ordered)
return (key, value)
items = (
(k, marshal(data, v, skip_none=skip_none, ordered=ordered))
if isinstance(v, dict)
else __format_field(k, v)
for k, v in iteritems(fields)
)
if skip_none:
items = (
(k, v) for k, v in items if v is not None and v != OrderedDict() and v != {}
)
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):
"""A decorator that apply marshalling to the return values of your methods.
>>> from flask_restx import fields, marshal_with
>>> mfields = { 'a': fields.Raw }
>>> @marshal_with(mfields)
... def get():
... return { 'a': 100, 'b': 'foo' }
...
...
>>> get()
OrderedDict([('a', 100)])
>>> @marshal_with(mfields, envelope='data')
... def get():
... return { 'a': 100, 'b': 'foo' }
...
...
>>> get()
OrderedDict([('data', OrderedDict([('a', 100)]))])
>>> mfields = { 'a': fields.Raw, 'c': fields.Raw, 'd': fields.Raw }
>>> @marshal_with(mfields, skip_none=True)
... def get():
... return { 'a': 100, 'b': 'foo', 'c': None }
...
...
>>> get()
OrderedDict([('a', 100)])
see :meth:`flask_restx.marshal`
"""
def __init__(
self, fields, envelope=None, skip_none=False, mask=None, ordered=False
):
"""
:param fields: a dict of whose keys will make up the final
serialized response output
:param envelope: optional key that will be used to envelop the serialized
response
"""
self.fields = fields
self.envelope = envelope
self.skip_none = skip_none
self.ordered = ordered
self.mask = Mask(mask, skip=True)
def __call__(self, f):
@wraps(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 (
marshal(
data,
self.fields,
self.envelope,
self.skip_none,
mask,
self.ordered,
),
code,
headers,
)
else:
return marshal(
resp, self.fields, self.envelope, self.skip_none, mask, self.ordered
)
return wrapper
class marshal_with_field(object):
"""
A decorator that formats the return values of your methods with a single field.
>>> from flask_restx import marshal_with_field, fields
>>> @marshal_with_field(fields.List(fields.Integer))
... def get():
... return ['1', 2, 3.0]
...
>>> get()
[1, 2, 3]
see :meth:`flask_restx.marshal_with`
"""
def __init__(self, field):
"""
:param field: a single field with which to marshal the output.
"""
if isinstance(field, type):
self.field = field()
else:
self.field = field
def __call__(self, f):
@wraps(f)
def wrapper(*args, **kwargs):
resp = f(*args, **kwargs)
if isinstance(resp, tuple):
data, code, headers = unpack(resp)
return self.field.format(data), code, headers
return self.field.format(resp)
return wrapper