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91 lines
4.6 KiB
Markdown
91 lines
4.6 KiB
Markdown
# Registry tool
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The registry tool is a command-line registry administration tool that is invoked
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using the `registry_tool` command. It has the ability to view and change a large
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number of things in a running domain registry environment, including creating
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registrars, updating premium and reserved lists, running an EPP command from a
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given XML file, and performing various backend tasks like re-running RDE if the
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most recent export failed. Its code lives inside the tools package
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(`java/google/registry/tools`), and is compiled by building the `registry_tool`
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target in the Bazel BUILD file in that package.
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To build the tool and display its command-line help, execute this command:
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$ bazel run //java/google/registry/tool:registry_tool -- --help
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For future invocations you should alias the compiled binary in the
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`bazel-genfiles/java/google/registry` directory or add it to your path so that
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you can run it more easily. The rest of this guide assumes that it has been
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aliased to `registry_tool`.
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The registry tool is always called with a specific environment to run in using
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the -e parameter. This looks like:
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$ registry_tool -e production {command name} {command parameters}
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To see a list of all available commands along with usage information, run
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registry_tool without specifying a command name, e.g.:
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$ registry_tool -e alpha
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Note that the documentation for the commands comes from JCommander, which parses
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metadata contained within the code to yield documentation.
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## Tech support commands
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There are actually two separate tools, `gtech_tool`, which is a collection of
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lower impact commands intended to be used by tech support personnel, and
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`registry_tool`, which is a superset of `gtech_tool` that contains additional
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commands that are potentially more destructive and can change more aspects of
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the system. A full list of `gtech_tool` commands can be found in
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`GtechTool.java`, and the additional commands that only `registry_tool` has
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access to are in `RegistryTool.java`.
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## Local and server-side commands
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There are two broad ways that commands are implemented: some that send requests
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to `ToolsServlet` to execute the action on the server (these commands implement
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`ServerSideCommand`), and others that execute the command locally using the
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[Remote API](https://cloud.google.com/appengine/docs/java/tools/remoteapi)
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(these commands implement `RemoteApiCommand`). Server-side commands take more
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work to implement because they require both a client and a server-side
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component, e.g. `CreatePremiumListCommand.java` and
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`CreatePremiumListAction.java` respectively for creating a premium list.
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However, they are fully capable of doing anything that is possible with App
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Engine, including running a large MapReduce, because they execute on the tools
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service in the App Engine cloud.
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Local commands, by contrast, are easier to implement, because there is only a
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local component to write, but they aren't as powerful. A general rule of thumb
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for making this determination is to use a local command if possible, or a
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server-side command otherwise.
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## Common tool patterns
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All tools ultimately implement the `Command` interface located in the `tools`
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package. If you use an IDE such as Eclipse to view the type hierarchy of that
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interface, you'll see all of the commands that exist, as well as how a lot of
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them are grouped using sub-interfaces or abstract classes that provide
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additional functionality. The most common patterns that are used by a large
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number of other tools are:
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* **`BigqueryCommand`** -- Provides a connection to BigQuery for tools that
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need it.
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* **`ConfirmingCommand`** -- Provides the methods `prompt()` and `execute()`
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to override. `prompt()` outputs a message (usually what the command is going
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to do) and prompts the user to confirm execution of the command, and then
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`execute()` actually does it.
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* **`EppToolCommand`** -- Commands that work by executing EPP commands against
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the server, usually by filling in a template with parameters that were
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passed on the command-line.
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* **`MutatingEppToolCommand`** -- A sub-class of `EppToolCommand` that
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provides a `--dry_run` flag, that, if passed, will display the output from
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the server of what the command would've done without actually committing
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those changes.
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* **`GetEppResourceCommand`** -- Gets individual EPP resources from the server
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and outputs them.
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* **`ListObjectsCommand`** -- Lists all objects of a specific type from the
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server and outputs them.
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* **`MutatingCommand`** -- Provides a facility to create or update entities in
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Datastore, and uses a diff algorithm to display the changes that will be
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made before committing them.
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