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"""Configuration system for CherryPy.
Configuration in CherryPy is implemented via dictionaries. Keys are strings
which name the mapped value, which may be of any type.
CherryPy Requests are part of an Application, which runs in a global context,
and configuration data may apply to any of those three scopes:
Global: configuration entries which apply everywhere are stored in
Application: entries which apply to each mounted application are stored
on the Application object itself, as 'app.config'. This is a two-level
dict where each key is a path, or "relative URL" (for example, "/" or
"/path/to/my/page"), and each value is a config dict. Usually, this
data is provided in the call to tree.mount(root(), config=conf),
although you may also use app.merge(conf).
Request: each Request object possesses a single 'Request.config' dict.
Early in the request process, this dict is populated by merging global
config entries, Application entries (whose path equals or is a parent
of Request.path_info), and any config acquired while looking up the
page handler (see next).
Configuration data may be supplied as a Python dictionary, as a filename,
or as an open file object. When you supply a filename or file, CherryPy
uses Python's builtin ConfigParser; you declare Application config by
writing each path as a section header:
[/path/to/my/page] = True
To declare global configuration entries, place them in a [global] section.
You may also declare config entries directly on the classes and methods
(page handlers) that make up your CherryPy application via the '_cp_config'
attribute. For example:
class Demo:
_cp_config = {'tools.gzip.on': True}
def index(self):
return "Hello world" = True
index._cp_config = {'request.show_tracebacks': False}
Note, however, that this behavior is only guaranteed for the default
dispatcher. Other dispatchers may have different restrictions on where
you can attach _cp_config attributes.
Configuration keys are separated into namespaces by the first "." in the key.
Current namespaces:
engine: Controls the 'application engine', including autoreload.
These can only be declared in the global config.
tree: Grafts cherrypy.Application objects onto cherrypy.tree.
These can only be declared in the global config.
hooks: Declares additional request-processing functions.
log: Configures the logging for each application.
These can only be declared in the global or / config.
request: Adds attributes to each Request.
response: Adds attributes to each Response.
server: Controls the default HTTP server via cherrypy.server.
These can only be declared in the global config.
tools: Runs and configures additional request-processing packages.
wsgi: Adds WSGI middleware to an Application's "pipeline".
These can only be declared in the app's root config ("/").
checker: Controls the 'checker', which looks for common errors in
app state (including config) when the engine starts.
Global config only.
The only key that does not exist in a namespace is the "environment" entry.
This special entry 'imports' other config entries from a template stored in
cherrypy._cpconfig.environments[environment]. It only applies to the global
config, and only when you use cherrypy.config.update.
You can define your own namespaces to be called at the Global, Application,
or Request level, by adding a named handler to cherrypy.config.namespaces,
app.namespaces, or app.request_class.namespaces. The name can
be any string, and the handler must be either a callable or a (Python 2.5
style) context manager.
except NameError:
from sets import Set as set
import cherrypy
from cherrypy.lib import reprconf
# Deprecated in CherryPy 3.2--remove in 3.3
NamespaceSet = reprconf.NamespaceSet
def merge(base, other):
"""Merge one app config (from a dict, file, or filename) into another.
If the given config is a filename, it will be appended to
the list of files to monitor for "autoreload" changes.
if isinstance(other, basestring):
# Load other into base
for section, value_map in reprconf.as_dict(other).items():
if not isinstance(value_map, dict):
raise ValueError(
"Application config must include section headers, but the "
"config you tried to merge doesn't have any sections. "
"Wrap your config in another dict with paths as section "
"headers, for example: {'/': config}.")
base.setdefault(section, {}).update(value_map)
class Config(reprconf.Config):
"""The 'global' configuration data for the entire CherryPy process."""
def update(self, config):
"""Update self from a dict, file or filename."""
if isinstance(config, basestring):
# Filename
reprconf.Config.update(self, config)
def _apply(self, config):
"""Update self from a dict."""
if isinstance(config.get("global", None), dict):
if len(config) > 1:
cherrypy.checker.global_config_contained_paths = True
config = config["global"]
if 'tools.staticdir.dir' in config:
config['tools.staticdir.section'] = "global"
reprconf.Config._apply(self, config)
def __call__(self, *args, **kwargs):
"""Decorator for page handlers to set _cp_config."""
if args:
raise TypeError(
"The cherrypy.config decorator does not accept positional "
"arguments; you must use keyword arguments.")
def tool_decorator(f):
if not hasattr(f, "_cp_config"):
f._cp_config = {}
for k, v in kwargs.items():
f._cp_config[k] = v
return f
return tool_decorator
Config.environments = environments = {
"staging": {
'engine.autoreload_on': False,
'checker.on': False,
'tools.log_headers.on': False,
'request.show_tracebacks': False,
'request.show_mismatched_params': False,
"production": {
'engine.autoreload_on': False,
'checker.on': False,
'tools.log_headers.on': False,
'request.show_tracebacks': False,
'request.show_mismatched_params': False,
'log.screen': False,
"embedded": {
# For use with CherryPy embedded in another deployment stack.
'engine.autoreload_on': False,
'checker.on': False,
'tools.log_headers.on': False,
'request.show_tracebacks': False,
'request.show_mismatched_params': False,
'log.screen': False,
'engine.SIGHUP': None,
'engine.SIGTERM': None,
"test_suite": {
'engine.autoreload_on': False,
'checker.on': False,
'tools.log_headers.on': False,
'request.show_tracebacks': True,
'request.show_mismatched_params': True,
'log.screen': False,
def _server_namespace_handler(k, v):
"""Config handler for the "server" namespace."""
atoms = k.split(".", 1)
if len(atoms) > 1:
# Special-case config keys of the form 'server.servername.socket_port'
# to configure additional HTTP servers.
if not hasattr(cherrypy, "servers"):
cherrypy.servers = {}
servername, k = atoms
if servername not in cherrypy.servers:
from cherrypy import _cpserver
cherrypy.servers[servername] = _cpserver.Server()
# On by default, but 'on = False' can unsubscribe it (see below).
if k == 'on':
if v:
setattr(cherrypy.servers[servername], k, v)
setattr(cherrypy.server, k, v)
Config.namespaces["server"] = _server_namespace_handler
def _engine_namespace_handler(k, v):
"""Backward compatibility handler for the "engine" namespace."""
engine = cherrypy.engine
if k == 'autoreload_on':
if v:
elif k == 'autoreload_frequency':
engine.autoreload.frequency = v
elif k == 'autoreload_match':
engine.autoreload.match = v
elif k == 'reload_files':
engine.autoreload.files = set(v)
elif k == 'deadlock_poll_freq':
engine.timeout_monitor.frequency = v
elif k == 'SIGHUP':
engine.listeners['SIGHUP'] = set([v])
elif k == 'SIGTERM':
engine.listeners['SIGTERM'] = set([v])
elif "." in k:
plugin, attrname = k.split(".", 1)
plugin = getattr(engine, plugin)
if attrname == 'on':
if v and hasattr(getattr(plugin, 'subscribe', None), '__call__'):
elif (not v) and hasattr(getattr(plugin, 'unsubscribe', None), '__call__'):
setattr(plugin, attrname, v)
setattr(engine, k, v)
Config.namespaces["engine"] = _engine_namespace_handler
def _tree_namespace_handler(k, v):
"""Namespace handler for the 'tree' config namespace."""
cherrypy.tree.graft(v, v.script_name)
cherrypy.engine.log("Mounted: %s on %s" % (v, v.script_name or "/"))
Config.namespaces["tree"] = _tree_namespace_handler
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