author | Augie Fackler <augie@google.com> |
Sun, 18 Feb 2018 00:03:27 -0500 | |
changeset 36296 | d18c0cf5f3ab |
parent 33802 | a0aad86b3b6a |
child 37181 | 0dfb5672f015 |
permissions | -rw-r--r-- |
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# repository.py - Interfaces and base classes for repositories and peers. |
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# |
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# Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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import abc |
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from .i18n import _ |
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from . import ( |
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error, |
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) |
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class _basepeer(object): |
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"""Represents a "connection" to a repository. |
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This is the base interface for representing a connection to a repository. |
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It holds basic properties and methods applicable to all peer types. |
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This is not a complete interface definition and should not be used |
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outside of this module. |
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""" |
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__metaclass__ = abc.ABCMeta |
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@abc.abstractproperty |
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def ui(self): |
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"""ui.ui instance.""" |
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@abc.abstractmethod |
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def url(self): |
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"""Returns a URL string representing this peer. |
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Currently, implementations expose the raw URL used to construct the |
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instance. It may contain credentials as part of the URL. The |
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expectations of the value aren't well-defined and this could lead to |
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data leakage. |
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TODO audit/clean consumers and more clearly define the contents of this |
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value. |
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""" |
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@abc.abstractmethod |
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def local(self): |
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"""Returns a local repository instance. |
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If the peer represents a local repository, returns an object that |
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can be used to interface with it. Otherwise returns ``None``. |
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""" |
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@abc.abstractmethod |
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def peer(self): |
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"""Returns an object conforming to this interface. |
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Most implementations will ``return self``. |
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""" |
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@abc.abstractmethod |
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def canpush(self): |
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"""Returns a boolean indicating if this peer can be pushed to.""" |
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@abc.abstractmethod |
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def close(self): |
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"""Close the connection to this peer. |
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This is called when the peer will no longer be used. Resources |
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associated with the peer should be cleaned up. |
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""" |
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class _basewirecommands(object): |
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"""Client-side interface for communicating over the wire protocol. |
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This interface is used as a gateway to the Mercurial wire protocol. |
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methods commonly call wire protocol commands of the same name. |
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""" |
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__metaclass__ = abc.ABCMeta |
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@abc.abstractmethod |
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def branchmap(self): |
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"""Obtain heads in named branches. |
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Returns a dict mapping branch name to an iterable of nodes that are |
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heads on that branch. |
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""" |
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@abc.abstractmethod |
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def capabilities(self): |
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"""Obtain capabilities of the peer. |
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Returns a set of string capabilities. |
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""" |
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@abc.abstractmethod |
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def debugwireargs(self, one, two, three=None, four=None, five=None): |
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"""Used to facilitate debugging of arguments passed over the wire.""" |
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@abc.abstractmethod |
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def getbundle(self, source, **kwargs): |
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"""Obtain remote repository data as a bundle. |
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This command is how the bulk of repository data is transferred from |
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the peer to the local repository |
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Returns a generator of bundle data. |
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""" |
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@abc.abstractmethod |
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def heads(self): |
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"""Determine all known head revisions in the peer. |
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Returns an iterable of binary nodes. |
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""" |
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@abc.abstractmethod |
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def known(self, nodes): |
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"""Determine whether multiple nodes are known. |
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Accepts an iterable of nodes whose presence to check for. |
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Returns an iterable of booleans indicating of the corresponding node |
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at that index is known to the peer. |
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""" |
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@abc.abstractmethod |
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def listkeys(self, namespace): |
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"""Obtain all keys in a pushkey namespace. |
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Returns an iterable of key names. |
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""" |
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@abc.abstractmethod |
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def lookup(self, key): |
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"""Resolve a value to a known revision. |
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Returns a binary node of the resolved revision on success. |
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""" |
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@abc.abstractmethod |
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def pushkey(self, namespace, key, old, new): |
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"""Set a value using the ``pushkey`` protocol. |
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Arguments correspond to the pushkey namespace and key to operate on and |
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the old and new values for that key. |
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Returns a string with the peer result. The value inside varies by the |
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namespace. |
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""" |
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@abc.abstractmethod |
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def stream_out(self): |
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"""Obtain streaming clone data. |
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Successful result should be a generator of data chunks. |
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""" |
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@abc.abstractmethod |
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def unbundle(self, bundle, heads, url): |
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"""Transfer repository data to the peer. |
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This is how the bulk of data during a push is transferred. |
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Returns the integer number of heads added to the peer. |
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""" |
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class _baselegacywirecommands(object): |
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"""Interface for implementing support for legacy wire protocol commands. |
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Wire protocol commands transition to legacy status when they are no longer |
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used by modern clients. To facilitate identifying which commands are |
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legacy, the interfaces are split. |
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""" |
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__metaclass__ = abc.ABCMeta |
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@abc.abstractmethod |
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def between(self, pairs): |
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"""Obtain nodes between pairs of nodes. |
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``pairs`` is an iterable of node pairs. |
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Returns an iterable of iterables of nodes corresponding to each |
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requested pair. |
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""" |
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@abc.abstractmethod |
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def branches(self, nodes): |
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"""Obtain ancestor changesets of specific nodes back to a branch point. |
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|
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For each requested node, the peer finds the first ancestor node that is |
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a DAG root or is a merge. |
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Returns an iterable of iterables with the resolved values for each node. |
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""" |
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@abc.abstractmethod |
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def changegroup(self, nodes, kind): |
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"""Obtain a changegroup with data for descendants of specified nodes.""" |
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|
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@abc.abstractmethod |
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def changegroupsubset(self, bases, heads, kind): |
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pass |
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class peer(_basepeer, _basewirecommands): |
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"""Unified interface and base class for peer repositories. |
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All peer instances must inherit from this class and conform to its |
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interface. |
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""" |
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@abc.abstractmethod |
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def iterbatch(self): |
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"""Obtain an object to be used for multiple method calls. |
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|
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Various operations call several methods on peer instances. If each |
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method call were performed immediately and serially, this would |
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require round trips to remote peers and/or would slow down execution. |
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|
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Some peers have the ability to "batch" method calls to avoid costly |
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round trips or to facilitate concurrent execution. |
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|
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This method returns an object that can be used to indicate intent to |
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perform batched method calls. |
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|
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The returned object is a proxy of this peer. It intercepts calls to |
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batchable methods and queues them instead of performing them |
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immediately. This proxy object has a ``submit`` method that will |
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perform all queued batchable method calls. A ``results()`` method |
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exposes the results of queued/batched method calls. It is a generator |
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of results in the order they were called. |
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|
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Not all peers or wire protocol implementations may actually batch method |
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calls. However, they must all support this API. |
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""" |
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|
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def capable(self, name): |
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"""Determine support for a named capability. |
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Returns ``False`` if capability not supported. |
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Returns ``True`` if boolean capability is supported. Returns a string |
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if capability support is non-boolean. |
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""" |
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caps = self.capabilities() |
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if name in caps: |
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return True |
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|
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name = '%s=' % name |
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for cap in caps: |
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if cap.startswith(name): |
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return cap[len(name):] |
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|
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return False |
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|
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def requirecap(self, name, purpose): |
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"""Require a capability to be present. |
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|
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Raises a ``CapabilityError`` if the capability isn't present. |
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""" |
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if self.capable(name): |
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return |
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|
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raise error.CapabilityError( |
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_('cannot %s; remote repository does not support the %r ' |
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'capability') % (purpose, name)) |
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|
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class legacypeer(peer, _baselegacywirecommands): |
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"""peer but with support for legacy wire protocol commands.""" |