commit fa26e4aad86b5d52a0cb4002afd302cfccebf768 Author: Damian Johnson atagar@torproject.org Date: Fri May 4 12:48:35 2018 -0700

Replace get_authorities() with DirectoryAuthority.from_cache()

Replacing our function for vending directory authority data. Simplifies our API by making us more consistant across our Directory subclasses. --- docs/change_log.rst | 1 + stem/descriptor/remote.py | 143 +++++++++++++++++++++++----------------------- 2 files changed, 71 insertions(+), 73 deletions(-)

diff --git a/docs/change_log.rst b/docs/change_log.rst index d10597ea..d5505821 100644 --- a/docs/change_log.rst +++ b/docs/change_log.rst @@ -57,6 +57,7 @@ The following are only available within Stem's `git repository

* `stem.descriptor.remote <api/descriptor/remote.html>`_ can now download from relay ORPorts * Zstd and lzma compression support (:spec:`1cb56af`) + * Added :func:`~stem.descriptor.remote.Directory.from_cache` and :func:`~stem.descriptor.remote.Directory.from_remote` to the :class:`~stem.descriptor.remote.DirectoryAuthority` subclass. * `Fallback directory v2 support https://lists.torproject.org/pipermail/tor-dev/2017-December/012721.html`_, which adds *nickname* and *extrainfo* * Added server descriptor's new is_hidden_service_dir attribute * Don't retry downloading descriptors when we've timed out diff --git a/stem/descriptor/remote.py b/stem/descriptor/remote.py index a656e354..e0b4c21d 100644 --- a/stem/descriptor/remote.py +++ b/stem/descriptor/remote.py @@ -50,13 +50,12 @@ content. For example... |- get_extrainfo_descriptors - provides present extrainfo descriptors +- get_consensus - provides the present consensus or router status entries

- get_authorities - Provides tor directory information. - Directory - Relay we can retrieve directory information from + | |- from_cache - Provides fallback directories cached with Stem. + | +- from_remote - Retrieves fallback directories remotely from tor's latest commit. + | |- DirectoryAuthority - Information about a tor directory authority +- FallbackDirectory - Directory mirror tor uses when authories are unavailable - |- from_cache - Provides fallback directories cached with Stem. - +- from_remote - Retrieves fallback directories remotely from tor's latest commit.

Query - Asynchronous request to download tor descriptors |- start - issues the query if it isn't already running @@ -1022,9 +1021,18 @@ class DescriptorDownloader(object):

class Directory(object): """ - Relay we can contact for directory information + Relay we can contact for directory information.

- .. versionadded:: 1.5.0 + Our :func:`~stem.descriptor.remote.Directory.from_cache` and + :func:`~stem.descriptor.remote.Directory.from_remote` functions key off a + different identifier based on our subclass... + + * **DirectoryAuthority** keys off the nickname. + * **FallbackDirectory** keys off fingerprints. + + This is because authorities are highly static and canonically known by their + names, whereas fallbacks vary more and don't necessarily have a nickname to + key off of.

.. versionchanged:: 1.3.0 Moved nickname from subclasses to this base class. @@ -1043,6 +1051,53 @@ class Directory(object): self.fingerprint = fingerprint self.nickname = nickname

+ @staticmethod + def from_cache(): + """ + Provides cached Tor directory information. This information is hardcoded + into Tor and occasionally changes, so the information this provides might + not necessarily match your version of tor. + + .. versionadded:: 1.5.0 + + .. versionchanged:: 1.7.0 + Support added to the :class:`~stem.descriptor.remote.DirectoryAuthority` class. + + :returns: **dict** of **str** identifiers to + :class:`~stem.descriptor.remote.Directory` instances + """ + + raise NotImplementedError('Unsupported Operation: this should be implemented by the Directory subclass') + + @staticmethod + def from_remote(timeout = 60): + """ + Reads and parses tor's directory data `from gitweb.torproject.org https://gitweb.torproject.org/`_. + Note that while convenient, this reliance on GitWeb means you should alway + call with a fallback, such as... + + :: + + try: + authorities = DirectoryAuthority.from_remote() + except IOError: + authorities = DirectoryAuthority.from_cache() + + .. versionadded:: 1.5.0 + + .. versionchanged:: 1.7.0 + Support added to the :class:`~stem.descriptor.remote.DirectoryAuthority` class. + + :param int timeout: seconds to wait before timing out the request + + :returns: **dict** of **str** identifiers to their + :class:`~stem.descriptor.remote.Directory` + + :raises: **IOError** if unable to retrieve the fallback directories + """ + + raise NotImplementedError('Unsupported Operation: this should be implemented by the Directory subclass') + def __hash__(self): return _hash_attr(self, 'address', 'or_port', 'dir_port', 'fingerprint')

@@ -1056,7 +1111,7 @@ class Directory(object): class DirectoryAuthority(Directory): """ Tor directory authority, a special type of relay `hardcoded into tor - https://gitweb.torproject.org/tor.git/tree/src/or/config.c#n819`_ + https://gitweb.torproject.org/tor.git/plain/src/or/auth_dirs.inc`_ that enumerates the other relays within the network.

At a very high level tor works as follows... @@ -1095,34 +1150,11 @@ class DirectoryAuthority(Directory): self.is_bandwidth_authority = is_bandwidth_authority

@staticmethod - def from_remote(timeout = 60): - """ - Reads and parses tor's latest directory authority data `from - gitweb.torproject.org - https://gitweb.torproject.org/tor.git/plain/src/or/auth_dirs.inc`_. - Note that while convenient, this reliance on GitWeb means you should alway - call with a fallback, such as... - - :: - - try: - fallback_directories = DirectoryAuthority.from_remote() - except IOError: - fallback_directories = get_authorities() - - Authorities provided through this method will not have a - **is_bandwidth_authority** value set. - - .. versionadded:: 1.7.0 - - :param int timeout: seconds to wait before timing out the request - - :returns: **dict** of **str** nicknames to their - :class:`~stem.descriptor.remote.DirectoryAuthority` - - :raises: **IOError** if unable to retrieve the directory authorities - """ + def from_cache(): + return dict(DIRECTORY_AUTHORITIES)

+ @staticmethod + def from_remote(timeout = 60): try: lines = str_tools._to_unicode(urllib.urlopen(GITWEB_AUTHORITY_URL, timeout = timeout).read()).splitlines() except: @@ -1341,10 +1373,13 @@ def get_authorities(): information hardcoded into Tor and occasionally changes, so the information this provides might not necessarily match your version of tor.

+ .. deprecated:: 1.7.0 + Use stem.descriptor.remote.DirectoryAuthority.from_cache() instead. + :returns: **dict** of **str** nicknames to :class:`~stem.descriptor.remote.DirectoryAuthority` instances """

- return dict(DIRECTORY_AUTHORITIES) + return DirectoryAuthority.from_cache()

class FallbackDirectory(Directory): @@ -1398,22 +1433,6 @@ class FallbackDirectory(Directory):

@staticmethod def from_cache(path = CACHE_PATH): - """ - Provides fallback directory information cached with Stem. Unlike - :func:`~stem.descriptor.remote.FallbackDirectory.from_remote` this doesn't - have any system requirements, and is faster too. Only drawback is that - these fallback directories are only as up to date as the Stem release we're - using. - - .. versionchanged:: 1.7.0 - Added the path argument. - - :param str path: cache file to load from - - :returns: **dict** of **str** fingerprints to their - :class:`~stem.descriptor.remote.FallbackDirectory` - """ - conf = stem.util.conf.Config() conf.load(path) headers = OrderedDict([(k.split('.', 1)[1], conf.get(k)) for k in conf.keys() if k.startswith('header.')]) @@ -1466,28 +1485,6 @@ class FallbackDirectory(Directory):

@staticmethod def from_remote(timeout = 60): - """ - Reads and parses tor's latest fallback directories `from - gitweb.torproject.org - https://gitweb.torproject.org/tor.git/plain/src/or/fallback_dirs.inc`_. - Note that while convenient, this reliance on GitWeb means you should alway - call with a fallback, such as... - - :: - - try: - fallback_directories = FallbackDirectory.from_remote() - except IOError: - fallback_directories = FallbackDirectory.from_cache() - - :param int timeout: seconds to wait before timing out the request - - :returns: **dict** of **str** fingerprints to their - :class:`~stem.descriptor.remote.FallbackDirectory` - - :raises: **IOError** if unable to retrieve the fallback directories - """ - try: lines = str_tools._to_unicode(urllib.urlopen(GITWEB_FALLBACK_URL, timeout = timeout).read()).splitlines() except: