158 lines
5.0 KiB
Python
158 lines
5.0 KiB
Python
import os
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import types
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from sanic.exceptions import PyFileError
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from sanic.helpers import import_string
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SANIC_PREFIX = "SANIC_"
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BASE_LOGO = """
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Sanic
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Build Fast. Run Fast.
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"""
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DEFAULT_CONFIG = {
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"REQUEST_MAX_SIZE": 100000000, # 100 megabytes
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"REQUEST_BUFFER_QUEUE_SIZE": 100,
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"REQUEST_TIMEOUT": 60, # 60 seconds
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"RESPONSE_TIMEOUT": 60, # 60 seconds
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"KEEP_ALIVE": True,
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"KEEP_ALIVE_TIMEOUT": 5, # 5 seconds
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"WEBSOCKET_MAX_SIZE": 2 ** 20, # 1 megabyte
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"WEBSOCKET_MAX_QUEUE": 32,
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"WEBSOCKET_READ_LIMIT": 2 ** 16,
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"WEBSOCKET_WRITE_LIMIT": 2 ** 16,
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"GRACEFUL_SHUTDOWN_TIMEOUT": 15.0, # 15 sec
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"ACCESS_LOG": True,
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"FORWARDED_SECRET": None,
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"REAL_IP_HEADER": None,
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"PROXIES_COUNT": None,
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"FORWARDED_FOR_HEADER": "X-Forwarded-For",
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}
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class Config(dict):
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def __init__(self, defaults=None, load_env=True, keep_alive=None):
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defaults = defaults or {}
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super().__init__({**DEFAULT_CONFIG, **defaults})
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self.LOGO = BASE_LOGO
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if keep_alive is not None:
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self.KEEP_ALIVE = keep_alive
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if load_env:
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prefix = SANIC_PREFIX if load_env is True else load_env
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self.load_environment_vars(prefix=prefix)
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def __getattr__(self, attr):
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try:
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return self[attr]
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except KeyError as ke:
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raise AttributeError(f"Config has no '{ke.args[0]}'")
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def __setattr__(self, attr, value):
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self[attr] = value
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def from_envvar(self, variable_name):
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"""Load a configuration from an environment variable pointing to
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a configuration file.
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:param variable_name: name of the environment variable
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:return: bool. ``True`` if able to load config, ``False`` otherwise.
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"""
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config_file = os.environ.get(variable_name)
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if not config_file:
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raise RuntimeError(
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"The environment variable %r is not set and "
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"thus configuration could not be loaded." % variable_name
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)
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return self.from_pyfile(config_file)
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def from_pyfile(self, filename):
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"""Update the values in the config from a Python file.
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Only the uppercase variables in that module are stored in the config.
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:param filename: an absolute path to the config file
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"""
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module = types.ModuleType("config")
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module.__file__ = filename
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try:
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with open(filename) as config_file:
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exec( # nosec
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compile(config_file.read(), filename, "exec"),
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module.__dict__,
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)
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except IOError as e:
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e.strerror = "Unable to load configuration file (%s)" % e.strerror
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raise
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except Exception as e:
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raise PyFileError(filename) from e
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self.from_object(module)
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return True
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def from_object(self, obj):
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"""Update the values from the given object.
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Objects are usually either modules or classes.
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Just the uppercase variables in that object are stored in the config.
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Example usage::
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from yourapplication import default_config
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app.config.from_object(default_config)
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or also:
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app.config.from_object('myproject.config.MyConfigClass')
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You should not use this function to load the actual configuration but
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rather configuration defaults. The actual config should be loaded
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with :meth:`from_pyfile` and ideally from a location not within the
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package because the package might be installed system wide.
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:param obj: an object holding the configuration
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"""
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if isinstance(obj, str):
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obj = import_string(obj)
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for key in dir(obj):
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if key.isupper():
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self[key] = getattr(obj, key)
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def load_environment_vars(self, prefix=SANIC_PREFIX):
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"""
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Looks for prefixed environment variables and applies
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them to the configuration if present.
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"""
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for k, v in os.environ.items():
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if k.startswith(prefix):
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_, config_key = k.split(prefix, 1)
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try:
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self[config_key] = int(v)
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except ValueError:
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try:
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self[config_key] = float(v)
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except ValueError:
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try:
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self[config_key] = strtobool(v)
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except ValueError:
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self[config_key] = v
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def strtobool(val):
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"""
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This function was borrowed from distutils.utils. While distutils
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is part of stdlib, it feels odd to use distutils in main application code.
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The function was modified to walk its talk and actually return bool
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and not int.
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"""
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val = val.lower()
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if val in ("y", "yes", "t", "true", "on", "1"):
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return True
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elif val in ("n", "no", "f", "false", "off", "0"):
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return False
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else:
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raise ValueError("invalid truth value %r" % (val,))
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