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