337 lines
12 KiB
Python
337 lines
12 KiB
Python
import re
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from collections import defaultdict, namedtuple
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from collections.abc import Iterable
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from functools import lru_cache
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from sanic.exceptions import NotFound, InvalidUsage
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from sanic.views import CompositionView
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Route = namedtuple(
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'Route',
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['handler', 'methods', 'pattern', 'parameters', 'name'])
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Parameter = namedtuple('Parameter', ['name', 'cast'])
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REGEX_TYPES = {
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'string': (str, r'[^/]+'),
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'int': (int, r'\d+'),
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'number': (float, r'[0-9\\.]+'),
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'alpha': (str, r'[A-Za-z]+'),
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}
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ROUTER_CACHE_SIZE = 1024
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def url_hash(url):
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return url.count('/')
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class RouteExists(Exception):
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pass
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class RouteDoesNotExist(Exception):
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pass
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class Router:
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"""Router supports basic routing with parameters and method checks
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Usage:
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.. code-block:: python
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@sanic.route('/my/url/<my_param>', methods=['GET', 'POST', ...])
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def my_route(request, my_param):
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do stuff...
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or
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.. code-block:: python
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@sanic.route('/my/url/<my_param:my_type>', methods['GET', 'POST', ...])
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def my_route_with_type(request, my_param: my_type):
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do stuff...
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Parameters will be passed as keyword arguments to the request handling
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function. Provided parameters can also have a type by appending :type to
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the <parameter>. Given parameter must be able to be type-casted to this.
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If no type is provided, a string is expected. A regular expression can
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also be passed in as the type. The argument given to the function will
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always be a string, independent of the type.
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"""
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routes_static = None
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routes_dynamic = None
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routes_always_check = None
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parameter_pattern = re.compile(r'<(.+?)>')
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def __init__(self):
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self.routes_all = {}
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self.routes_static = {}
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self.routes_dynamic = defaultdict(list)
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self.routes_always_check = []
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self.hosts = set()
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def parse_parameter_string(self, parameter_string):
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"""Parse a parameter string into its constituent name, type, and
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pattern
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For example:
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`parse_parameter_string('<param_one:[A-z]>')` ->
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('param_one', str, '[A-z]')
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:param parameter_string: String to parse
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:return: tuple containing
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(parameter_name, parameter_type, parameter_pattern)
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"""
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# We could receive NAME or NAME:PATTERN
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name = parameter_string
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pattern = 'string'
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if ':' in parameter_string:
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name, pattern = parameter_string.split(':', 1)
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default = (str, pattern)
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# Pull from pre-configured types
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_type, pattern = REGEX_TYPES.get(pattern, default)
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return name, _type, pattern
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def add(self, uri, methods, handler, host=None):
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# add regular version
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self._add(uri, methods, handler, host)
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slash_is_missing = (not uri[-1].endswith('/')
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and not self.routes_all.get(uri + '/', False))
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without_slash_is_missing = (not self.routes_all.get(uri[:-1], False)
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and uri is not '/')
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# add version with trailing slash
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if slash_is_missing:
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self._add(uri + '/', methods, handler, host)
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# add version without trailing slash
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elif without_slash_is_missing:
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self._add(uri[:-1], methods, handler, host)
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def _add(self, uri, methods, handler, host=None):
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"""Add a handler to the route list
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:param uri: path to match
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:param methods: sequence of accepted method names. If none are
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provided, any method is allowed
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:param handler: request handler function.
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When executed, it should provide a response object.
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:return: Nothing
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"""
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if host is not None:
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if isinstance(host, str):
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uri = host + uri
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self.hosts.add(host)
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else:
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if not isinstance(host, Iterable):
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raise ValueError("Expected either string or Iterable of "
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"host strings, not {!r}".format(host))
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for host_ in host:
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self.add(uri, methods, handler, host_)
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return
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else:
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# default host
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self.hosts.add('*')
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# Dict for faster lookups of if method allowed
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if methods:
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methods = frozenset(methods)
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parameters = []
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properties = {"unhashable": None}
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def add_parameter(match):
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name = match.group(1)
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name, _type, pattern = self.parse_parameter_string(name)
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parameter = Parameter(
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name=name, cast=_type)
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parameters.append(parameter)
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# Mark the whole route as unhashable if it has the hash key in it
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if re.search('(^|[^^]){1}/', pattern):
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properties['unhashable'] = True
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# Mark the route as unhashable if it matches the hash key
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elif re.search(pattern, '/'):
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properties['unhashable'] = True
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return '({})'.format(pattern)
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pattern_string = re.sub(self.parameter_pattern, add_parameter, uri)
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pattern = re.compile(r'^{}$'.format(pattern_string))
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def merge_route(route, methods, handler):
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# merge to the existing route when possible.
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if not route.methods or not methods:
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# method-unspecified routes are not mergeable.
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raise RouteExists(
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"Route already registered: {}".format(uri))
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elif route.methods.intersection(methods):
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# already existing method is not overloadable.
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duplicated = methods.intersection(route.methods)
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raise RouteExists(
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"Route already registered: {} [{}]".format(
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uri, ','.join(list(duplicated))))
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if isinstance(route.handler, CompositionView):
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view = route.handler
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else:
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view = CompositionView()
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view.add(route.methods, route.handler)
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view.add(methods, handler)
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route = route._replace(
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handler=view, methods=methods.union(route.methods))
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return route
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if parameters:
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# TODO: This is too complex, we need to reduce the complexity
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if properties['unhashable']:
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routes_to_check = self.routes_always_check
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ndx, route = self.check_dynamic_route_exists(
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pattern, routes_to_check)
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else:
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routes_to_check = self.routes_dynamic[url_hash(uri)]
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ndx, route = self.check_dynamic_route_exists(
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pattern, routes_to_check)
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if ndx != -1:
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# Pop the ndx of the route, no dups of the same route
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routes_to_check.pop(ndx)
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else:
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route = self.routes_all.get(uri)
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if route:
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route = merge_route(route, methods, handler)
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else:
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# prefix the handler name with the blueprint name
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# if available
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if hasattr(handler, '__blueprintname__'):
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handler_name = '{}.{}'.format(
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handler.__blueprintname__, handler.__name__)
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else:
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handler_name = getattr(handler, '__name__', None)
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route = Route(
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handler=handler, methods=methods, pattern=pattern,
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parameters=parameters, name=handler_name)
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self.routes_all[uri] = route
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if properties['unhashable']:
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self.routes_always_check.append(route)
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elif parameters:
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self.routes_dynamic[url_hash(uri)].append(route)
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else:
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self.routes_static[uri] = route
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@staticmethod
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def check_dynamic_route_exists(pattern, routes_to_check):
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for ndx, route in enumerate(routes_to_check):
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if route.pattern == pattern:
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return ndx, route
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else:
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return -1, None
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def remove(self, uri, clean_cache=True, host=None):
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if host is not None:
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uri = host + uri
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try:
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route = self.routes_all.pop(uri)
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except KeyError:
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raise RouteDoesNotExist("Route was not registered: {}".format(uri))
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if route in self.routes_always_check:
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self.routes_always_check.remove(route)
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elif url_hash(uri) in self.routes_dynamic \
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and route in self.routes_dynamic[url_hash(uri)]:
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self.routes_dynamic[url_hash(uri)].remove(route)
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else:
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self.routes_static.pop(uri)
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if clean_cache:
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self._get.cache_clear()
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@lru_cache(maxsize=ROUTER_CACHE_SIZE)
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def find_route_by_view_name(self, view_name):
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"""Find a route in the router based on the specified view name.
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:param view_name: string of view name to search by
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:return: tuple containing (uri, Route)
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"""
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if not view_name:
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return (None, None)
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for uri, route in self.routes_all.items():
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if route.name == view_name:
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return uri, route
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return (None, None)
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def get(self, request):
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"""Get a request handler based on the URL of the request, or raises an
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error
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:param request: Request object
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:return: handler, arguments, keyword arguments
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"""
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# No virtual hosts specified; default behavior
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if not self.hosts:
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return self._get(request.url, request.method, '')
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# virtual hosts specified; try to match route to the host header
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try:
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return self._get(request.url, request.method,
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request.headers.get("Host", ''))
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# try default hosts
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except NotFound:
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return self._get(request.url, request.method, '')
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@lru_cache(maxsize=ROUTER_CACHE_SIZE)
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def _get(self, url, method, host):
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"""Get a request handler based on the URL of the request, or raises an
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error. Internal method for caching.
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:param url: request URL
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:param method: request method
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:return: handler, arguments, keyword arguments
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"""
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url = host + url
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# Check against known static routes
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route = self.routes_static.get(url)
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method_not_supported = InvalidUsage(
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'Method {} not allowed for URL {}'.format(
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method, url), status_code=405)
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if route:
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if route.methods and method not in route.methods:
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raise method_not_supported
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match = route.pattern.match(url)
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else:
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route_found = False
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# Move on to testing all regex routes
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for route in self.routes_dynamic[url_hash(url)]:
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match = route.pattern.match(url)
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route_found |= match is not None
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# Do early method checking
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if match and method in route.methods:
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break
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else:
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# Lastly, check against all regex routes that cannot be hashed
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for route in self.routes_always_check:
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match = route.pattern.match(url)
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route_found |= match is not None
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# Do early method checking
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if match and method in route.methods:
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break
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else:
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# Route was found but the methods didn't match
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if route_found:
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raise method_not_supported
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raise NotFound('Requested URL {} not found'.format(url))
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kwargs = {p.name: p.cast(value)
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for value, p
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in zip(match.groups(1), route.parameters)}
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route_handler = route.handler
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if hasattr(route_handler, 'handlers'):
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route_handler = route_handler.handlers[method]
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return route_handler, [], kwargs
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