def preload_state(state: Dict[str, Any], routes: routing.RoutesConfig) -> None:
components = get_preloaded_components(routes)
for component in components:
builder = getattr(component, 'build')
pipeline = pipelines.build_pipeline(function=builder,
initial_types=[App])
pipelines.run_pipeline(pipeline, state)
def func(environ: Mapping, start_response: Callable) -> Iterator:
method = environ['REQUEST_METHOD']
path = environ['PATH_INFO']
lookup_key = method + ' ' + path
state = {
'wsgi_environ': environ,
'method': method,
'path': path,
'exception': None,
'view': None,
'url_path_args': {},
}
state.update(preloaded)
try:
try:
(state['view'], pipeline,
state['url_path_args']) = lookup_cache[lookup_key]
except KeyError:
(state['view'], pipeline,
state['url_path_args']) = lookup_cache[lookup_key] = lookup(
path, method)
if len(lookup_cache) > lookup_cache_size:
lookup_cache.pop(next(iter(lookup_cache)))
for function, inputs, output, extra_kwargs in pipeline:
# Determine the keyword arguments for each step in the pipeline.
kwargs = {}
for arg_name, state_key in inputs:
kwargs[arg_name] = state[state_key]
if extra_kwargs is not None:
kwargs.update(extra_kwargs)
# Call the function for each step in the pipeline.
state[output] = function(**kwargs)
except Exception as exc:
state['exception'] = exc
pipelines.run_pipeline(app.router.exception_pipeline, state)
wsgi_response = state['wsgi_response']
start_response(wsgi_response.status, wsgi_response.headers)
return wsgi_response.iterator