[tor-commits] [stem/master] Revising error handling for get_conf()
atagar at torproject.org
atagar at torproject.org
Mon Dec 17 04:25:01 UTC 2012
commit 5b45d3125c811067d7c3ba0a11e324423c88d925
Author: Damian Johnson <atagar at torproject.org>
Date: Sun Dec 16 11:03:07 2012 -0800
Revising error handling for get_conf()
The Controller's get_conf() function was buggy if the configuration value was
unset. It's documented as returning the default, but instead it returned None
or [None] depending on if 'multiple' was set.
On reflection the pydocs for these functions were pretty unfriendly, so giving
them an overhaul. Functionally this changes two things...
1. When you query for an unset value it will...
* provide the default value if you gave it one
* provide None if multiple was False, and [] if it was True
2. The get_conf_map()'s 'default' argument is now the defaultly *mapped value*
rather than the default *response*. For instance...
# old behavior
get_conf_map('NoOption', 'Blarg') => 'Blarg'
# new behavior
get_conf_map('NoOption', 'Blarg') => {'NoOption': 'Blarg'}
This means that the get_conf_map() pydocs can now assure the caller that
they'll always get a dict, and it also better matches the get_conf()
handling for default.
---
stem/control.py | 117 ++++++++++++++++++++++----------------
stem/response/getconf.py | 6 ++-
test/integ/control/controller.py | 10 +++-
test/unit/response/getconf.py | 2 +-
4 files changed, 81 insertions(+), 54 deletions(-)
diff --git a/stem/control.py b/stem/control.py
index b8bbf15..a12609f 100644
--- a/stem/control.py
+++ b/stem/control.py
@@ -978,24 +978,32 @@ class Controller(BaseController):
def get_conf(self, param, default = UNDEFINED, multiple = False):
"""
- Queries the control socket for the value of a given configuration option. If
- provided a default then that's returned as if the GETCONF option is undefined
- or if the call fails for any reason (invalid configuration option, error
- response, control port closed, initiated, etc). If the configuration key
- consists of whitespace only, **None** is returned unless a default value is
- given.
+ Queries the current value for a configuration option. Some configuration
+ options (like the ExitPolicy) can have multiple values. This provides a
+ **list** with all of the values if **multiple** is **True**. Otherwise this
+ will be a **str** with the first value.
+
+ If provided with a **default** then that is provided if the configuration
+ option was unset or the query fails (invalid configuration option, error
+ response, control port closed, initiated, etc).
+
+ If the configuration value is unset and no **default** was given then this
+ provides **None** if **multiple** was **False** and an empty list if it was
+ **True**.
:param str param: configuration option to be queried
- :param object default: response if the query fails
- :param bool multiple: if **True**, the value(s) provided are lists of all
- returned values, otherwise this just provides the first value
+ :param object default: response if the option is unset or the query fails
+ :param bool multiple: if **True** then provides a list with all of the
+ present values (this is an empty list if the config option is unset)
:returns:
Response depends upon how we were called as follows...
- * **str** with the response if multiple was **False**
+ * **str** with the configuration value if **multiple** was **False**,
+ **None** if it was unset
* **list** with the response strings if multiple was **True**
- * default if one was provided and our call failed
+ * default if one was provided and the configuration option was either
+ unset or our call failed
:raises:
* :class:`stem.ControllerError` if the call fails and we weren't
@@ -1017,49 +1025,45 @@ class Controller(BaseController):
def get_conf_map(self, params, default = UNDEFINED, multiple = True):
"""
- Queries the control socket for the values of given configuration options
- and provides a mapping of the keys to the values. If provided a default
- then that's returned if the GETCONF option is undefined or if the call
- fails for any reason (invalid configuration option, error response, control
- port closed, initiated, etc). Configuration keys that are empty or contain
- only whitespace are ignored.
+ Similar to :func:`~stem.control.Controller.get_conf` but queries multiple
+ configuration options, providing back a mapping of those options to their
+ values.
- There's three use cases for GETCONF:
+ There are three use cases for GETCONF:
- 1. a single value is provided
- 2. multiple values are provided for the option queried
+ 1. a single value is provided (ex. **ControlPort**)
+ 2. multiple values are provided for the option (ex. **ExitPolicy**)
3. a set of options that weren't necessarily requested are returned (for
- instance querying HiddenServiceOptions gives HiddenServiceDir,
- HiddenServicePort, etc)
+ instance querying **HiddenServiceOptions** gives **HiddenServiceDir**,
+ **HiddenServicePort**, etc)
The vast majority of the options fall into the first two categories, in
which case calling :func:`~stem.control.Controller.get_conf` is sufficient.
However, for batch queries or the special options that give a set of values
this provides back the full response. As of tor version 0.2.1.25
- HiddenServiceOptions was the only option like this.
-
- The :func:`~stem.control.Controller.get_conf` and
- :func:`~stem.control.Controller.get_conf_map` functions both try to account
- for these special mappings, so queried like get_conf("HiddenServicePort")
- should behave as you'd expect. This method, however, simply returns
- whatever Tor provides so get_conf_map("HiddenServicePort") will give the
- same response as get_conf_map("HiddenServiceOptions").
+ **HiddenServiceOptions** was the only option that falls into the third
+ category.
:param str,list params: configuration option(s) to be queried
- :param object default: response if the query fails
- :param bool multiple: if **True**, the value(s) provided are lists of all
- returned values,otherwise this just provides the first value
+ :param object default: value for the mappings if the configuration option
+ is either undefined or the query fails
+ :param bool multiple: if **True** then the provided are lists with all of
+ the present values
:returns:
- Response depends upon how we were called as follows...
+ **dict** of the 'config key => value' mappings. The value is a...
- * **dict** of 'config key => value' mappings, the value is a list if
- 'multiple' is **True** and a **str** of just the first value otherwise
- * default if one was provided and our call failed
+ * **str** if **multiple** is **False**, **None** if the configuration
+ option is unset
+ * **list** if **multiple** is **True**
+ * the **default** if it was set and the value was either undefined or our
+ lookup failed
:raises:
- * :class:`stem.ControllerError` if the call fails and we weren't provided a default response
- * :class:`stem.InvalidArguments` if the configuration option requested was invalid
+ * :class:`stem.ControllerError` if the call fails and we weren't provided
+ a default response
+ * :class:`stem.InvalidArguments` if the configuration option requested
+ was invalid
"""
start_time = time.time()
@@ -1086,11 +1090,7 @@ class Controller(BaseController):
# if everything was cached then short circuit making the query
if not lookup_params:
log.trace("GETCONF %s (cache fetch)" % " ".join(reply.keys()))
-
- if multiple:
- return reply
- else:
- return dict([(entry[0], entry[1][0]) for entry in reply.items()])
+ return self._get_conf_dict_to_response(reply, default, multiple)
try:
response = self.msg("GETCONF %s" % ' '.join(lookup_params))
@@ -1120,17 +1120,34 @@ class Controller(BaseController):
del reply[key]
log.debug("GETCONF %s (runtime: %0.4f)" % (" ".join(lookup_params), time.time() - start_time))
-
- if multiple:
- return reply
- else:
- return dict([(entry[0], entry[1][0]) for entry in reply.items()])
+ return self._get_conf_dict_to_response(reply, default, multiple)
except stem.ControllerError, exc:
log.debug("GETCONF %s (failed: %s)" % (" ".join(lookup_params), exc))
- if default != UNDEFINED: return default
+ if default != UNDEFINED: return dict((param, default) for param in params)
else: raise exc
+ def _get_conf_dict_to_response(self, config_dict, default, multiple):
+ """
+ Translates a dictionary of 'config key => [value1, value2...]' into the
+ return value of :func:`~stem.control.Controller.get_conf_map`, taking into
+ account what the caller requested.
+ """
+
+ return_dict = {}
+
+ for key, values in config_dict.items():
+ if values == []:
+ # config option was unset
+ if default != UNDEFINED:
+ return_dict[key] = default
+ else:
+ return_dict[key] = [] if multiple else None
+ else:
+ return_dict[key] = values if multiple else values[0]
+
+ return return_dict
+
def set_conf(self, param, value):
"""
Changes the value of a tor configuration option. Our value can be any of
diff --git a/stem/response/getconf.py b/stem/response/getconf.py
index df1a71f..879c5c0 100644
--- a/stem/response/getconf.py
+++ b/stem/response/getconf.py
@@ -49,5 +49,9 @@ class GetConfResponse(stem.response.ControlMessage):
else:
key, value = (line.pop(), None)
- self.entries.setdefault(key, []).append(value)
+ if not key in self.entries:
+ self.entries[key] = []
+
+ if value is not None:
+ self.entries[key].append(value)
diff --git a/test/integ/control/controller.py b/test/integ/control/controller.py
index 9af3cae..9efeb00 100644
--- a/test/integ/control/controller.py
+++ b/test/integ/control/controller.py
@@ -263,14 +263,20 @@ class TestController(unittest.TestCase):
reply_params = controller.get_conf_map(request_params, multiple=False).keys()
self.assertEqual(set(request_params), set(reply_params))
+ # queries an option that is unset
+
+ self.assertEqual(None, controller.get_conf("HTTPSProxy"))
+ self.assertEqual("la-di-dah", controller.get_conf("HTTPSProxy", "la-di-dah"))
+ self.assertEqual([], controller.get_conf("HTTPSProxy", [], multiple = True))
+
# non-existant option(s)
self.assertRaises(stem.InvalidArguments, controller.get_conf, "blarg")
self.assertEqual("la-di-dah", controller.get_conf("blarg", "la-di-dah"))
self.assertRaises(stem.InvalidArguments, controller.get_conf_map, "blarg")
- self.assertEqual("la-di-dah", controller.get_conf_map("blarg", "la-di-dah"))
+ self.assertEqual({"blarg": "la-di-dah"}, controller.get_conf_map("blarg", "la-di-dah"))
self.assertRaises(stem.InvalidRequest, controller.get_conf_map, ["blarg", "huadf"], multiple = True)
- self.assertEqual("la-di-dah", controller.get_conf_map(["erfusdj", "afiafj"], "la-di-dah", multiple = True))
+ self.assertEqual({"erfusdj": "la-di-dah", "afiafj": "la-di-dah"}, controller.get_conf_map(["erfusdj", "afiafj"], "la-di-dah", multiple = True))
# multivalue configuration keys
nodefamilies = [("abc", "xyz", "pqrs"), ("mno", "tuv", "wxyz")]
diff --git a/test/unit/response/getconf.py b/test/unit/response/getconf.py
index 14ef974..8a3aedb 100644
--- a/test/unit/response/getconf.py
+++ b/test/unit/response/getconf.py
@@ -71,7 +71,7 @@ class TestGetConfResponse(unittest.TestCase):
"CookieAuthentication": ["0"],
"ControlPort": ["9100"],
"DataDirectory": ["/tmp/fake dir"],
- "DirPort": [None],
+ "DirPort": [],
}
self.assertEqual(expected, control_message.entries)
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