adds CockroachDB as an option to the Piccolo playground

docs/src/piccolo/getting_started/playground.rst

@@ -37,8 +37,8 @@ A ``piccolo.sqlite`` file will get created in the current directory.
 Advanced usage
 ---------------
 
-To see how to use the playground with Postgres, and other advanced usage, see
-:ref:`PlaygroundAdvanced`.
+To see how to use the playground with Postgres or Cockroach, and other
+advanced usage, see :ref:`PlaygroundAdvanced`.
 
 -------------------------------------------------------------------------------
 

docs/src/piccolo/playground/advanced.rst

@@ -44,6 +44,56 @@ When you have the database setup, you can connect to it as follows:
 
     piccolo playground run --engine=postgres
 
+CockroachDB
+-----------
+
+If you want to use CockroachDB instead of SQLite, you need to create a database
+first.
+
+
+Install CockroachDB
+~~~~~~~~~~~~~~~~~~~
+
+See the `installation guide for your OS <https://www.cockroachlabs.com/docs/v25.2/install-cockroachdb-linux/>`_.
+
+Create database
+~~~~~~~~~~~~~~~
+The playground is for testing and learning purposes only, so you can start a CockroachDB
+`single node with the insecure flag <https://www.cockroachlabs.com/docs/v25.2/cockroach-start-single-node.html/>`_
+(for non-production testing only) like this:
+
+.. code-block:: bash
+
+    cockroach start-single-node --insecure
+
+After that, in a new terminal window, you can create a database like this:
+
+.. code-block:: bash
+
+    cockroach sql --insecure --execute="DROP DATABASE IF EXISTS piccolo_playground CASCADE;CREATE DATABASE piccolo_playground;"
+
+By default the playground expects a local database to exist with the following
+credentials:
+
+
+.. code-block:: bash
+
+    user: "root"
+    password: ""
+    host: "localhost"  # or 127.0.0.1
+    database: "piccolo_playground"
+    port: 26257
+
+
+Connecting
+~~~~~~~~~~
+
+When you have the database setup, you can connect to it as follows:
+
+.. code-block:: bash
+
+    piccolo playground run --engine=cockroach
+
 iPython
 -------
 

piccolo/apps/playground/commands/run.py

@@ -8,6 +8,7 @@
 import uuid
 from decimal import Decimal
 from enum import Enum
+from typing import Optional
 
 from piccolo.columns import (
     JSON,
@@ -25,7 +26,7 @@
     Varchar,
 )
 from piccolo.columns.readable import Readable
-from piccolo.engine import PostgresEngine, SQLiteEngine
+from piccolo.engine import CockroachEngine, PostgresEngine, SQLiteEngine
 from piccolo.engine.base import Engine
 from piccolo.table import Table
 from piccolo.utils.warnings import colored_string
@@ -284,28 +285,29 @@ def populate():
 
 def run(
     engine: str = "sqlite",
-    user: str = "piccolo",
-    password: str = "piccolo",
+    user: Optional[str] = None,
+    password: Optional[str] = None,
     database: str = "piccolo_playground",
     host: str = "localhost",
-    port: int = 5432,
+    port: Optional[int] = None,
     ipython_profile: bool = False,
 ):
     """
     Creates a test database to play with.
 
     :param engine:
-        Which database engine to use - options are sqlite or postgres
+        Which database engine to use - options are sqlite, postgres or
+        cockroach
     :param user:
-        Postgres user
+        Database user (ignored for SQLite)
     :param password:
-        Postgres password
+        Database password (ignored for SQLite)
     :param database:
-        Postgres database
+        Database name (ignored for SQLite)
     :param host:
-        Postgres host
+        Database host (ignored for SQLite)
     :param port:
-        Postgres port
+        Database port (ignored for SQLite)
     :param ipython_profile:
         Set to true to use your own IPython profile. Located at ~/.ipython/.
         For more info see the IPython docs
@@ -324,9 +326,19 @@ def run(
             {
                 "host": host,
                 "database": database,
-                "user": user,
-                "password": password,
-                "port": port,
+                "user": user or "piccolo",
+                "password": password or "piccolo",
+                "port": port or 5432,
+            }
+        )
+    elif engine.upper() == "COCKROACH":
+        db = CockroachEngine(
+            {
+                "host": host,
+                "database": database,
+                "user": user or "root",
+                "password": password or "",
+                "port": port or 26257,
             }
         )
     else: