mirror of
https://github.com/nodejs/node.git
synced 2024-11-21 10:59:27 +00:00
0befda6970
* Tree-factor location of some *.py files for easy demarcation of areas to exclude. PR-URL: https://github.com/nodejs/node/pull/25614 Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
257 lines
7.7 KiB
Python
257 lines
7.7 KiB
Python
# -*- coding: utf-8 -*-
|
|
"""
|
|
jinja2.asyncsupport
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
Has all the code for async support which is implemented as a patch
|
|
for supported Python versions.
|
|
|
|
:copyright: (c) 2017 by the Jinja Team.
|
|
:license: BSD, see LICENSE for more details.
|
|
"""
|
|
import sys
|
|
import asyncio
|
|
import inspect
|
|
from functools import update_wrapper
|
|
|
|
from jinja2.utils import concat, internalcode, Markup
|
|
from jinja2.environment import TemplateModule
|
|
from jinja2.runtime import LoopContextBase, _last_iteration
|
|
|
|
|
|
async def concat_async(async_gen):
|
|
rv = []
|
|
async def collect():
|
|
async for event in async_gen:
|
|
rv.append(event)
|
|
await collect()
|
|
return concat(rv)
|
|
|
|
|
|
async def generate_async(self, *args, **kwargs):
|
|
vars = dict(*args, **kwargs)
|
|
try:
|
|
async for event in self.root_render_func(self.new_context(vars)):
|
|
yield event
|
|
except Exception:
|
|
exc_info = sys.exc_info()
|
|
else:
|
|
return
|
|
yield self.environment.handle_exception(exc_info, True)
|
|
|
|
|
|
def wrap_generate_func(original_generate):
|
|
def _convert_generator(self, loop, args, kwargs):
|
|
async_gen = self.generate_async(*args, **kwargs)
|
|
try:
|
|
while 1:
|
|
yield loop.run_until_complete(async_gen.__anext__())
|
|
except StopAsyncIteration:
|
|
pass
|
|
def generate(self, *args, **kwargs):
|
|
if not self.environment.is_async:
|
|
return original_generate(self, *args, **kwargs)
|
|
return _convert_generator(self, asyncio.get_event_loop(), args, kwargs)
|
|
return update_wrapper(generate, original_generate)
|
|
|
|
|
|
async def render_async(self, *args, **kwargs):
|
|
if not self.environment.is_async:
|
|
raise RuntimeError('The environment was not created with async mode '
|
|
'enabled.')
|
|
|
|
vars = dict(*args, **kwargs)
|
|
ctx = self.new_context(vars)
|
|
|
|
try:
|
|
return await concat_async(self.root_render_func(ctx))
|
|
except Exception:
|
|
exc_info = sys.exc_info()
|
|
return self.environment.handle_exception(exc_info, True)
|
|
|
|
|
|
def wrap_render_func(original_render):
|
|
def render(self, *args, **kwargs):
|
|
if not self.environment.is_async:
|
|
return original_render(self, *args, **kwargs)
|
|
loop = asyncio.get_event_loop()
|
|
return loop.run_until_complete(self.render_async(*args, **kwargs))
|
|
return update_wrapper(render, original_render)
|
|
|
|
|
|
def wrap_block_reference_call(original_call):
|
|
@internalcode
|
|
async def async_call(self):
|
|
rv = await concat_async(self._stack[self._depth](self._context))
|
|
if self._context.eval_ctx.autoescape:
|
|
rv = Markup(rv)
|
|
return rv
|
|
|
|
@internalcode
|
|
def __call__(self):
|
|
if not self._context.environment.is_async:
|
|
return original_call(self)
|
|
return async_call(self)
|
|
|
|
return update_wrapper(__call__, original_call)
|
|
|
|
|
|
def wrap_macro_invoke(original_invoke):
|
|
@internalcode
|
|
async def async_invoke(self, arguments, autoescape):
|
|
rv = await self._func(*arguments)
|
|
if autoescape:
|
|
rv = Markup(rv)
|
|
return rv
|
|
|
|
@internalcode
|
|
def _invoke(self, arguments, autoescape):
|
|
if not self._environment.is_async:
|
|
return original_invoke(self, arguments, autoescape)
|
|
return async_invoke(self, arguments, autoescape)
|
|
return update_wrapper(_invoke, original_invoke)
|
|
|
|
|
|
@internalcode
|
|
async def get_default_module_async(self):
|
|
if self._module is not None:
|
|
return self._module
|
|
self._module = rv = await self.make_module_async()
|
|
return rv
|
|
|
|
|
|
def wrap_default_module(original_default_module):
|
|
@internalcode
|
|
def _get_default_module(self):
|
|
if self.environment.is_async:
|
|
raise RuntimeError('Template module attribute is unavailable '
|
|
'in async mode')
|
|
return original_default_module(self)
|
|
return _get_default_module
|
|
|
|
|
|
async def make_module_async(self, vars=None, shared=False, locals=None):
|
|
context = self.new_context(vars, shared, locals)
|
|
body_stream = []
|
|
async for item in self.root_render_func(context):
|
|
body_stream.append(item)
|
|
return TemplateModule(self, context, body_stream)
|
|
|
|
|
|
def patch_template():
|
|
from jinja2 import Template
|
|
Template.generate = wrap_generate_func(Template.generate)
|
|
Template.generate_async = update_wrapper(
|
|
generate_async, Template.generate_async)
|
|
Template.render_async = update_wrapper(
|
|
render_async, Template.render_async)
|
|
Template.render = wrap_render_func(Template.render)
|
|
Template._get_default_module = wrap_default_module(
|
|
Template._get_default_module)
|
|
Template._get_default_module_async = get_default_module_async
|
|
Template.make_module_async = update_wrapper(
|
|
make_module_async, Template.make_module_async)
|
|
|
|
|
|
def patch_runtime():
|
|
from jinja2.runtime import BlockReference, Macro
|
|
BlockReference.__call__ = wrap_block_reference_call(
|
|
BlockReference.__call__)
|
|
Macro._invoke = wrap_macro_invoke(Macro._invoke)
|
|
|
|
|
|
def patch_filters():
|
|
from jinja2.filters import FILTERS
|
|
from jinja2.asyncfilters import ASYNC_FILTERS
|
|
FILTERS.update(ASYNC_FILTERS)
|
|
|
|
|
|
def patch_all():
|
|
patch_template()
|
|
patch_runtime()
|
|
patch_filters()
|
|
|
|
|
|
async def auto_await(value):
|
|
if inspect.isawaitable(value):
|
|
return await value
|
|
return value
|
|
|
|
|
|
async def auto_aiter(iterable):
|
|
if hasattr(iterable, '__aiter__'):
|
|
async for item in iterable:
|
|
yield item
|
|
return
|
|
for item in iterable:
|
|
yield item
|
|
|
|
|
|
class AsyncLoopContext(LoopContextBase):
|
|
|
|
def __init__(self, async_iterator, undefined, after, length, recurse=None,
|
|
depth0=0):
|
|
LoopContextBase.__init__(self, undefined, recurse, depth0)
|
|
self._async_iterator = async_iterator
|
|
self._after = after
|
|
self._length = length
|
|
|
|
@property
|
|
def length(self):
|
|
if self._length is None:
|
|
raise TypeError('Loop length for some iterators cannot be '
|
|
'lazily calculated in async mode')
|
|
return self._length
|
|
|
|
def __aiter__(self):
|
|
return AsyncLoopContextIterator(self)
|
|
|
|
|
|
class AsyncLoopContextIterator(object):
|
|
__slots__ = ('context',)
|
|
|
|
def __init__(self, context):
|
|
self.context = context
|
|
|
|
def __aiter__(self):
|
|
return self
|
|
|
|
async def __anext__(self):
|
|
ctx = self.context
|
|
ctx.index0 += 1
|
|
if ctx._after is _last_iteration:
|
|
raise StopAsyncIteration()
|
|
ctx._before = ctx._current
|
|
ctx._current = ctx._after
|
|
try:
|
|
ctx._after = await ctx._async_iterator.__anext__()
|
|
except StopAsyncIteration:
|
|
ctx._after = _last_iteration
|
|
return ctx._current, ctx
|
|
|
|
|
|
async def make_async_loop_context(iterable, undefined, recurse=None, depth0=0):
|
|
# Length is more complicated and less efficient in async mode. The
|
|
# reason for this is that we cannot know if length will be used
|
|
# upfront but because length is a property we cannot lazily execute it
|
|
# later. This means that we need to buffer it up and measure :(
|
|
#
|
|
# We however only do this for actual iterators, not for async
|
|
# iterators as blocking here does not seem like the best idea in the
|
|
# world.
|
|
try:
|
|
length = len(iterable)
|
|
except (TypeError, AttributeError):
|
|
if not hasattr(iterable, '__aiter__'):
|
|
iterable = tuple(iterable)
|
|
length = len(iterable)
|
|
else:
|
|
length = None
|
|
async_iterator = auto_aiter(iterable)
|
|
try:
|
|
after = await async_iterator.__anext__()
|
|
except StopAsyncIteration:
|
|
after = _last_iteration
|
|
return AsyncLoopContext(async_iterator, undefined, after, length, recurse,
|
|
depth0)
|