+"""
+This example:
+
+1. Connects to the current model
+2. Resets it
+3. Deploys a charm and prints its config and constraints
+
+"""
+import asyncio
+import logging
+
+from juju.model import Model
+from juju import loop
+
+log = logging.getLogger(__name__)
+
+MB = 1
+
+
+async def main():
+ model = Model()
+ await model.connect_current()
+ await model.reset(force=True)
+
+ ubuntu_app = await model.deploy(
+ 'mysql',
+ application_name='mysql',
+ series='trusty',
+ channel='stable',
+ config={
+ 'tuning-level': 'safest',
+ },
+ constraints={
+ 'mem': 256 * MB,
+ },
+ )
+
+ # update and check app config
+ await ubuntu_app.set_config({'tuning-level': 'fast'})
+ config = await ubuntu_app.get_config()
+ assert(config['tuning-level']['value'] == 'fast')
+
+ # update and check app constraints
+ await ubuntu_app.set_constraints({'mem': 512 * MB})
+ constraints = await ubuntu_app.get_constraints()
+ assert(constraints['mem'] == 512 * MB)
+
+ await model.disconnect()
+
+
+if __name__ == '__main__':
+ logging.basicConfig(level=logging.DEBUG)
+ ws_logger = logging.getLogger('websockets.protocol')
+ ws_logger.setLevel(logging.INFO)
+ loop.run(main())