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This patch introduces a new directory layout in doc/source in conformance with the OpenStack manuals project migration spec [1], moves the existing content in manila/doc/source into the new directories, and adjusts index files accordingly. This is the first step in the migration process as outlined in the spec. [1] https://specs.openstack.org/openstack/docs-specs/specs/pike/os-manuals-migration.html Partial-Bug: #1706181 Needed-By: I7924d94b82e7c8d9716bad7a219fc38c57970773 Depends-On: Ifc80fc56648cef74c85464321d1850e8c68449a0 Depends-On: Ia750cb049c0f53a234ea70ce1f2bbbb7a2aa9454 Change-Id: Ieea33262101a1d2459492c1c8aaac5fe042279f6
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Services, Managers and Drivers
The responsibilities of Services, Managers, and Drivers, can be a bit confusing to people that are new to manila. This document attempts to outline the division of responsibilities to make understanding the system a little bit easier.
Currently, Managers and Drivers are specified by flags and loaded using utils.load_object(). This method allows for them to be implemented as singletons, classes, modules or objects. As long as the path specified by the flag leads to an object (or a callable that returns an object) that responds to getattr, it should work as a manager or driver.
The manila.service Module
manila.service
The manila.manager Module
manila.manager
Implementation-Specific Drivers
A manager will generally load a driver for some of its tasks. The driver is responsible for specific implementation details. Anything running shell commands on a host, or dealing with other non-python code should probably be happening in a driver.
Drivers should minimize touching the database, although it is currently acceptable for implementation specific data. This may be reconsidered at some point.
It usually makes sense to define an Abstract Base Class for the specific driver (i.e. VolumeDriver), to define the methods that a different driver would need to implement.