283 lines
8.4 KiB
Python
283 lines
8.4 KiB
Python
# Copyright 2016 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import abc
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class Driver(object, metaclass=abc.ABCMeta):
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"""A Driver is an extension component of Zuul that supports
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interfacing with a remote system. It can support any of the following
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interfaces (but must support at least one to be useful):
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* ConnectionInterface
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* SourceInterface
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* TriggerInterface
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* ReporterInterface
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Zuul will create a single instance of each Driver (which will be
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shared by all tenants), and this instance will persist for the life of
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the process. The Driver class may therefore manage any global state
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used by all connections.
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The class or instance attribute **name** must be provided as a string.
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"""
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name = None # type: str
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def reconfigure(self, tenant):
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"""Called when a tenant is reconfigured.
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This method is optional; the base implementation does nothing.
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When Zuul performs a reconfiguration for a tenant, this method
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is called with the tenant (including the new layout
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configuration) as an argument. The driver may establish any
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global resources needed by the tenant at this point.
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:arg Tenant tenant: The :py:class:`zuul.model.Tenant` which has been
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reconfigured.
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"""
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pass
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def registerScheduler(self, scheduler):
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"""Register the scheduler with the driver.
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This method is optional; the base implementation does nothing.
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This method is called once during initialization to allow the
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driver to store a handle to the running scheduler.
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:arg Scheduler scheduler: The current running
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:py:class:`zuul.scheduler.Scheduler`.
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"""
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pass
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def stop(self):
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"""Stop the driver from running.
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This method is optional; the base implementation does nothing.
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This method is called when the connection registry is stopped
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allowing you additionally stop any running Driver computation
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not specific to a connection.
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"""
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pass
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class ConnectionInterface(object, metaclass=abc.ABCMeta):
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"""The Connection interface.
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A driver which is able to supply a Connection should implement
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this interface.
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"""
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@abc.abstractmethod
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def getConnection(self, name, config):
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"""Create and return a new Connection object.
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This method is required by the interface.
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This method will be called once for each connection specified
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in zuul.conf. The resultant object should be responsible for
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establishing any long-lived connections to remote systems. If
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Zuul is reconfigured, all existing connections will be stopped
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and this method will be called again for any new connections
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which should be created.
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When a connection is specified in zuul.conf with a name, that
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name is used here when creating the connection, and it is also
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used in the layout to attach triggers and reporters to the
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named connection. If the Driver does not utilize a connection
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(because it does not interact with a remote system), do not
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implement this method and Zuul will automatically associate
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triggers and reporters with the name of the Driver itself
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where it would normally expect the name of a connection.
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:arg str name: The name of the connection. This is the name
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supplied in the zuul.conf file where the connection is
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configured.
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:arg dict config: The configuration information supplied along
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with the connection in zuul.conf.
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:returns: A new Connection object.
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:rtype: Connection
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"""
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pass
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class TriggerInterface(object, metaclass=abc.ABCMeta):
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"""The trigger interface.
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A driver which is able to supply a trigger should implement this
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interface.
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"""
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@abc.abstractmethod
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def getTrigger(self, connection, config=None):
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"""Create and return a new trigger object.
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This method is required by the interface.
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The trigger object returned should inherit from the
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:py:class:`~zuul.trigger.BaseTrigger` class.
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:arg Connection connection: The Connection object associated
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with the trigger (as previously returned by getConnection)
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or None.
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:arg dict config: The configuration information supplied along
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with the trigger in the layout.
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:returns: A new trigger object.
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:rtype: :py:class:`~zuul.trigger.BaseTrigger`
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"""
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pass
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@abc.abstractmethod
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def getTriggerSchema(self):
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"""Get the schema for this driver's trigger.
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This method is required by the interface.
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:returns: A voluptuous schema.
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:rtype: dict or Schema
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"""
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pass
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class SourceInterface(object, metaclass=abc.ABCMeta):
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"""The source interface to be implemented by a driver.
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A driver which is able to supply a Source should implement this
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interface.
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"""
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@abc.abstractmethod
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def getSource(self, connection):
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"""Create and return a new Source object.
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This method is required by the interface.
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:arg Connection connection: The Connection object associated
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with the source (as previously returned by getConnection).
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:returns: A new Source object.
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:rtype: Source
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"""
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pass
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@abc.abstractmethod
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def getRequireSchema(self):
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"""Get the schema for this driver's pipeline requirement filter.
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This method is required by the interface.
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:returns: A voluptuous schema.
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:rtype: dict or Schema
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"""
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pass
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@abc.abstractmethod
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def getRejectSchema(self):
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"""Get the schema for this driver's pipeline reject filter.
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This method is required by the interface.
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:returns: A voluptuous schema.
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:rtype: dict or Schema
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"""
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pass
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class ReporterInterface(object, metaclass=abc.ABCMeta):
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"""The reporter interface to be implemented by a driver.
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A driver which is able to supply a Reporter should implement this
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interface.
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"""
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@abc.abstractmethod
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def getReporter(self, connection, config=None):
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"""Create and return a new Reporter object.
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This method is required by the interface.
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:arg Connection connection: The Connection object associated
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with the reporter (as previously returned by getConnection)
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or None.
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:arg dict config: The configuration information supplied along
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with the reporter in the layout.
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:returns: A new Reporter object.
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:rtype: Reporter
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"""
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pass
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@abc.abstractmethod
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def getReporterSchema(self):
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"""Get the schema for this driver's reporter.
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This method is required by the interface.
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:returns: A voluptuous schema.
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:rtype: dict or Schema
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"""
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pass
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class WrapperInterface(object, metaclass=abc.ABCMeta):
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"""The wrapper interface to be implmeneted by a driver.
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A driver which wraps execution of commands executed by Zuul should
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implement this interface.
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"""
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@abc.abstractmethod
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def getPopen(self, **kwargs):
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"""Create and return a subprocess.Popen factory wrapped however the
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driver sees fit.
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This method is required by the interface
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:arg dict kwargs: key/values for use by driver as needed
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:returns: a callable that takes the same args as subprocess.Popen
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:rtype: Callable
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"""
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pass
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@abc.abstractmethod
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def setMountsMap(self, state_dir, ro_dirs=[], rw_dirs=[]):
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"""Add additional mount point to the execution environment.
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:arg str state_dir: the state directory to be read write
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:arg list ro_dirs: read only directories paths
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:arg list rw_dirs: read write directories paths
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"""
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pass
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