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264 lines
7.0 KiB
264 lines
7.0 KiB
# -*- coding: utf-8 -*-
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"""The code for async support. Importing this patches Jinja on supported
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Python versions.
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"""
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import asyncio
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import inspect
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from functools import update_wrapper
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from markupsafe import Markup
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from .environment import TemplateModule
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from .runtime import LoopContext
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from .utils import concat
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from .utils import internalcode
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from .utils import missing
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async def concat_async(async_gen):
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rv = []
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async def collect():
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async for event in async_gen:
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rv.append(event)
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await collect()
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return concat(rv)
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async def generate_async(self, *args, **kwargs):
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vars = dict(*args, **kwargs)
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try:
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async for event in self.root_render_func(self.new_context(vars)):
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yield event
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except Exception:
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yield self.environment.handle_exception()
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def wrap_generate_func(original_generate):
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def _convert_generator(self, loop, args, kwargs):
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async_gen = self.generate_async(*args, **kwargs)
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try:
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while 1:
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yield loop.run_until_complete(async_gen.__anext__())
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except StopAsyncIteration:
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pass
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def generate(self, *args, **kwargs):
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if not self.environment.is_async:
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return original_generate(self, *args, **kwargs)
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return _convert_generator(self, asyncio.get_event_loop(), args, kwargs)
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return update_wrapper(generate, original_generate)
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async def render_async(self, *args, **kwargs):
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if not self.environment.is_async:
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raise RuntimeError("The environment was not created with async mode enabled.")
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vars = dict(*args, **kwargs)
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ctx = self.new_context(vars)
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try:
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return await concat_async(self.root_render_func(ctx))
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except Exception:
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return self.environment.handle_exception()
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def wrap_render_func(original_render):
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def render(self, *args, **kwargs):
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if not self.environment.is_async:
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return original_render(self, *args, **kwargs)
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loop = asyncio.get_event_loop()
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return loop.run_until_complete(self.render_async(*args, **kwargs))
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return update_wrapper(render, original_render)
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def wrap_block_reference_call(original_call):
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@internalcode
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async def async_call(self):
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rv = await concat_async(self._stack[self._depth](self._context))
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if self._context.eval_ctx.autoescape:
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rv = Markup(rv)
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return rv
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@internalcode
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def __call__(self):
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if not self._context.environment.is_async:
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return original_call(self)
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return async_call(self)
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return update_wrapper(__call__, original_call)
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def wrap_macro_invoke(original_invoke):
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@internalcode
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async def async_invoke(self, arguments, autoescape):
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rv = await self._func(*arguments)
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if autoescape:
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rv = Markup(rv)
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return rv
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@internalcode
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def _invoke(self, arguments, autoescape):
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if not self._environment.is_async:
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return original_invoke(self, arguments, autoescape)
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return async_invoke(self, arguments, autoescape)
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return update_wrapper(_invoke, original_invoke)
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@internalcode
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async def get_default_module_async(self):
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if self._module is not None:
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return self._module
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self._module = rv = await self.make_module_async()
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return rv
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def wrap_default_module(original_default_module):
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@internalcode
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def _get_default_module(self):
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if self.environment.is_async:
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raise RuntimeError("Template module attribute is unavailable in async mode")
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return original_default_module(self)
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return _get_default_module
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async def make_module_async(self, vars=None, shared=False, locals=None):
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context = self.new_context(vars, shared, locals)
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body_stream = []
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async for item in self.root_render_func(context):
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body_stream.append(item)
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return TemplateModule(self, context, body_stream)
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def patch_template():
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from . import Template
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Template.generate = wrap_generate_func(Template.generate)
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Template.generate_async = update_wrapper(generate_async, Template.generate_async)
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Template.render_async = update_wrapper(render_async, Template.render_async)
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Template.render = wrap_render_func(Template.render)
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Template._get_default_module = wrap_default_module(Template._get_default_module)
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Template._get_default_module_async = get_default_module_async
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Template.make_module_async = update_wrapper(
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make_module_async, Template.make_module_async
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)
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def patch_runtime():
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from .runtime import BlockReference, Macro
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BlockReference.__call__ = wrap_block_reference_call(BlockReference.__call__)
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Macro._invoke = wrap_macro_invoke(Macro._invoke)
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def patch_filters():
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from .filters import FILTERS
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from .asyncfilters import ASYNC_FILTERS
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FILTERS.update(ASYNC_FILTERS)
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def patch_all():
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patch_template()
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patch_runtime()
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patch_filters()
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async def auto_await(value):
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if inspect.isawaitable(value):
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return await value
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return value
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async def auto_aiter(iterable):
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if hasattr(iterable, "__aiter__"):
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async for item in iterable:
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yield item
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return
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for item in iterable:
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yield item
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class AsyncLoopContext(LoopContext):
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_to_iterator = staticmethod(auto_aiter)
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@property
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async def length(self):
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if self._length is not None:
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return self._length
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try:
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self._length = len(self._iterable)
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except TypeError:
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iterable = [x async for x in self._iterator]
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self._iterator = self._to_iterator(iterable)
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self._length = len(iterable) + self.index + (self._after is not missing)
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return self._length
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@property
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async def revindex0(self):
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return await self.length - self.index
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@property
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async def revindex(self):
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return await self.length - self.index0
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async def _peek_next(self):
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if self._after is not missing:
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return self._after
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try:
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self._after = await self._iterator.__anext__()
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except StopAsyncIteration:
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self._after = missing
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return self._after
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@property
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async def last(self):
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return await self._peek_next() is missing
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@property
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async def nextitem(self):
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rv = await self._peek_next()
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if rv is missing:
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return self._undefined("there is no next item")
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return rv
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def __aiter__(self):
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return self
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async def __anext__(self):
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if self._after is not missing:
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rv = self._after
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self._after = missing
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else:
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rv = await self._iterator.__anext__()
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self.index0 += 1
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self._before = self._current
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self._current = rv
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return rv, self
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async def make_async_loop_context(iterable, undefined, recurse=None, depth0=0):
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import warnings
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warnings.warn(
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"This template must be recompiled with at least Jinja 2.11, or"
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" it will fail in 3.0.",
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DeprecationWarning,
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stacklevel=2,
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)
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return AsyncLoopContext(iterable, undefined, recurse, depth0)
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patch_all()
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