[AIRFLOW-1275] Put 'airflow pool' into API

Closes #2346 from skudriashev/airflow-1275

airflow/api/client/api_client.py

@@ -14,17 +14,47 @@
 #
 
 
-class Client:
+class Client(object):
+    """Base API client for all API clients."""
+
     def __init__(self, api_base_url, auth):
         self._api_base_url = api_base_url
         self._auth = auth
 
     def trigger_dag(self, dag_id, run_id=None, conf=None, execution_date=None):
-        """
-        Creates a dag run for the specified dag
+        """Create a dag run for the specified dag.
+
         :param dag_id:
         :param run_id:
         :param conf:
+        :param execution_date:
         :return:
         """
         raise NotImplementedError()
+
+    def get_pool(self, name):
+        """Get pool.
+
+        :param name: pool name
+        """
+        raise NotImplementedError()
+
+    def get_pools(self):
+        """Get all pools."""
+        raise NotImplementedError()
+
+    def create_pool(self, name, slots, description):
+        """Create a pool.
+
+        :param name: pool name
+        :param slots: pool slots amount
+        :param description: pool description
+        """
+        raise NotImplementedError()
+
+    def delete_pool(self, name):
+        """Delete pool.
+
+        :param name: pool name
+        """
+        raise NotImplementedError()

airflow/api/client/json_client.py

@@ -11,30 +11,70 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-#
+
 from future.moves.urllib.parse import urljoin
+import requests
 
 from airflow.api.client import api_client
 
-import requests
-
 
 class Client(api_client.Client):
+    """Json API client implementation."""
+
+    def _request(self, url, method='GET', json=None):
+        params = {
+            'url': url,
+            'auth': self._auth,
+        }
+        if json is not None:
+            params['json'] = json
+
+        resp = getattr(requests, method.lower())(**params)
+        if not resp.ok:
+            try:
+                data = resp.json()
+            except Exception:
+                data = {}
+            raise IOError(data.get('error', 'Server error'))
+
+        return resp.json()
+
     def trigger_dag(self, dag_id, run_id=None, conf=None, execution_date=None):
         endpoint = '/api/experimental/dags/{}/dag_runs'.format(dag_id)
         url = urljoin(self._api_base_url, endpoint)
-
-        resp = requests.post(url,
-                             auth=self._auth,
+        data = self._request(url, method='POST',
                              json={
                                  "run_id": run_id,
                                  "conf": conf,
                                  "execution_date": execution_date,
                              })
-
-        if not resp.ok:
-            raise IOError()
-
-        data = resp.json()
-
         return data['message']
+
+    def get_pool(self, name):
+        endpoint = '/api/experimental/pools/{}'.format(name)
+        url = urljoin(self._api_base_url, endpoint)
+        pool = self._request(url)
+        return pool['pool'], pool['slots'], pool['description']
+
+    def get_pools(self):
+        endpoint = '/api/experimental/pools'
+        url = urljoin(self._api_base_url, endpoint)
+        pools = self._request(url)
+        return [(p['pool'], p['slots'], p['description']) for p in pools]
+
+    def create_pool(self, name, slots, description):
+        endpoint = '/api/experimental/pools'
+        url = urljoin(self._api_base_url, endpoint)
+        pool = self._request(url, method='POST',
+                             json={
+                                 'name': name,
+                                 'slots': slots,
+                                 'description': description,
+                             })
+        return pool['pool'], pool['slots'], pool['description']
+
+    def delete_pool(self, name):
+        endpoint = '/api/experimental/pools/{}'.format(name)
+        url = urljoin(self._api_base_url, endpoint)
+        pool = self._request(url, method='DELETE')
+        return pool['pool'], pool['slots'], pool['description']

airflow/api/client/local_client.py

@@ -11,15 +11,33 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-#
+
 from airflow.api.client import api_client
+from airflow.api.common.experimental import pool
 from airflow.api.common.experimental import trigger_dag
 
 
 class Client(api_client.Client):
+    """Local API client implementation."""
+
     def trigger_dag(self, dag_id, run_id=None, conf=None, execution_date=None):
         dr = trigger_dag.trigger_dag(dag_id=dag_id,
                                      run_id=run_id,
                                      conf=conf,
                                      execution_date=execution_date)
         return "Created {}".format(dr)
+
+    def get_pool(self, name):
+        p = pool.get_pool(name=name)
+        return p.pool, p.slots, p.description
+
+    def get_pools(self):
+        return [(p.pool, p.slots, p.description) for p in pool.get_pools()]
+
+    def create_pool(self, name, slots, description):
+        p = pool.create_pool(name=name, slots=slots, description=description)
+        return p.pool, p.slots, p.description
+
+    def delete_pool(self, name):
+        p = pool.delete_pool(name=name)
+        return p.pool, p.slots, p.description

airflow/api/common/experimental/pool.py

@@ -0,0 +1,85 @@
+# -*- coding: utf-8 -*-
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from airflow.exceptions import AirflowException
+from airflow.models import Pool
+from airflow.utils.db import provide_session
+
+
+class PoolBadRequest(AirflowException):
+    status = 400
+
+
+class PoolNotFound(AirflowException):
+    status = 404
+
+
+@provide_session
+def get_pool(name, session=None):
+    """Get pool by a given name."""
+    if not (name and name.strip()):
+        raise PoolBadRequest("Pool name shouldn't be empty")
+
+    pool = session.query(Pool).filter_by(pool=name).first()
+    if pool is None:
+        raise PoolNotFound("Pool '%s' doesn't exist" % name)
+
+    return pool
+
+
+@provide_session
+def get_pools(session=None):
+    """Get all pools."""
+    return session.query(Pool).all()
+
+
+@provide_session
+def create_pool(name, slots, description, session=None):
+    """Create a pool with a given parameters."""
+    if not (name and name.strip()):
+        raise PoolBadRequest("Pool name shouldn't be empty")
+
+    try:
+        slots = int(slots)
+    except ValueError:
+        raise PoolBadRequest("Bad value for `slots`: %s" % slots)
+
+    session.expire_on_commit = False
+    pool = session.query(Pool).filter_by(pool=name).first()
+    if pool is None:
+        pool = Pool(pool=name, slots=slots, description=description)
+        session.add(pool)
+    else:
+        pool.slots = slots
+        pool.description = description
+
+    session.commit()
+
+    return pool
+
+
+@provide_session
+def delete_pool(name, session=None):
+    """Delete pool by a given name."""
+    if not (name and name.strip()):
+        raise PoolBadRequest("Pool name shouldn't be empty")
+
+    pool = session.query(Pool).filter_by(pool=name).first()
+    if pool is None:
+        raise PoolNotFound("Pool '%s' doesn't exist" % name)
+
+    session.delete(pool)
+    session.commit()
+
+    return pool

airflow/bin/cli.py

@@ -49,7 +49,7 @@ from airflow.exceptions import AirflowException
 from airflow.executors import GetDefaultExecutor
 from airflow.models import (DagModel, DagBag, TaskInstance,
                             DagPickle, DagRun, Variable, DagStat,
-                            Pool, Connection)
+                            Connection)
 from airflow.ti_deps.dep_context import (DepContext, SCHEDULER_DEPS)
 from airflow.utils import db as db_utils
 from airflow.utils import logging as logging_utils
@@ -187,40 +187,28 @@ def trigger_dag(args):
 
 
 def pool(args):
-    session = settings.Session()
-    if args.get or (args.set and args.set[0]) or args.delete:
-        name = args.get or args.delete or args.set[0]
-    pool = (
-        session.query(Pool)
-        .filter(Pool.pool == name)
-        .first())
-    if pool and args.get:
-        print("{} ".format(pool))
-        return
-    elif not pool and (args.get or args.delete):
-        print("No pool named {} found".format(name))
-    elif not pool and args.set:
-        pool = Pool(
-            pool=name,
-            slots=args.set[1],
-            description=args.set[2])
-        session.add(pool)
-        session.commit()
-        print("{} ".format(pool))
-    elif pool and args.set:
-        pool.slots = args.set[1]
-        pool.description = args.set[2]
-        session.commit()
-        print("{} ".format(pool))
-        return
-    elif pool and args.delete:
-        session.query(Pool).filter_by(pool=args.delete).delete()
-        session.commit()
-        print("Pool {} deleted".format(name))
+    def _tabulate(pools):
+        return "\n%s" % tabulate(pools, ['Pool', 'Slots', 'Description'],
+                                 tablefmt="fancy_grid")
+
+    try:
+        if args.get is not None:
+            pools = [api_client.get_pool(name=args.get)]
+        elif args.set:
+            pools = [api_client.create_pool(name=args.set[0],
+                                            slots=args.set[1],
+                                            description=args.set[2])]
+        elif args.delete:
+            pools = [api_client.delete_pool(name=args.delete)]
+        else:
+            pools = api_client.get_pools()
+    except (AirflowException, IOError) as err:
+        logging.error(err)
+    else:
+        logging.info(_tabulate(pools=pools))
 
 
 def variables(args):
-
     if args.get:
         try:
             var = Variable.get(args.get,

airflow/models.py

@@ -4395,6 +4395,14 @@ class Pool(Base):
     def __repr__(self):
         return self.pool
 
+    def to_json(self):
+        return {
+            'id': self.id,
+            'pool': self.pool,
+            'slots': self.slots,
+            'description': self.description,
+        }
+
     @provide_session
     def used_slots(self, session):
         """

airflow/www/api/experimental/endpoints.py

@@ -11,10 +11,12 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 import logging
 
 import airflow.api
 
+from airflow.api.common.experimental import pool as pool_api
 from airflow.api.common.experimental import trigger_dag as trigger
 from airflow.api.common.experimental.get_task import get_task
 from airflow.api.common.experimental.get_task_instance import get_task_instance
@@ -96,7 +98,6 @@ def test():
 @requires_authentication
 def task_info(dag_id, task_id):
     """Returns a JSON with a task's public instance variables. """
-
     try:
         info = get_task(dag_id, task_id)
     except AirflowException as err:
@@ -169,4 +170,67 @@ def latest_dag_runs():
                 'dag_run_url': url_for('airflow.graph', dag_id=dagrun.dag_id,
                                        execution_date=dagrun.execution_date)
             })
-    return jsonify(items=payload) # old flask versions dont support jsonifying arrays
+    return jsonify(items=payload)  # old flask versions dont support jsonifying arrays
+
+
+@api_experimental.route('/pools/<string:name>', methods=['GET'])
+@requires_authentication
+def get_pool(name):
+    """Get pool by a given name."""
+    try:
+        pool = pool_api.get_pool(name=name)
+    except AirflowException as e:
+        _log.error(e)
+        response = jsonify(error="{}".format(e))
+        response.status_code = getattr(e, 'status', 500)
+        return response
+    else:
+        return jsonify(pool.to_json())
+
+
+@api_experimental.route('/pools', methods=['GET'])
+@requires_authentication
+def get_pools():
+    """Get all pools."""
+    try:
+        pools = pool_api.get_pools()
+    except AirflowException as e:
+        _log.error(e)
+        response = jsonify(error="{}".format(e))
+        response.status_code = getattr(e, 'status', 500)
+        return response
+    else:
+        return jsonify([p.to_json() for p in pools])
+
+
+@csrf.exempt
+@api_experimental.route('/pools', methods=['POST'])
+@requires_authentication
+def create_pool():
+    """Create a pool."""
+    params = request.get_json(force=True)
+    try:
+        pool = pool_api.create_pool(**params)
+    except AirflowException as e:
+        _log.error(e)
+        response = jsonify(error="{}".format(e))
+        response.status_code = getattr(e, 'status', 500)
+        return response
+    else:
+        return jsonify(pool.to_json())
+
+
+@csrf.exempt
+@api_experimental.route('/pools/<string:name>', methods=['DELETE'])
+@requires_authentication
+def delete_pool(name):
+    """Delete pool."""
+    try:
+        pool = pool_api.delete_pool(name=name)
+    except AirflowException as e:
+        _log.error(e)
+        response = jsonify(error="{}".format(e))
+        response.status_code = getattr(e, 'status', 500)
+        return response
+    else:
+        return jsonify(pool.to_json())

tests/api/__init__.py

@@ -11,9 +11,3 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
-from __future__ import absolute_import
-
-from .client import *
-from .common import *
-

tests/api/client/test_local_client.py

@@ -12,16 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import datetime
 import json
 import unittest
-import datetime
 
 from mock import patch
 
 from airflow import AirflowException
-from airflow import models
-
 from airflow.api.client.local_client import Client
+from airflow import models
+from airflow import settings
 from airflow.utils.state import State
 
 EXECDATE = datetime.datetime.now()
@@ -53,8 +53,25 @@ def mock_datetime_now(target, dt):
 
 
 class TestLocalClient(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestLocalClient, cls).setUpClass()
+        session = settings.Session()
+        session.query(models.Pool).delete()
+        session.commit()
+        session.close()
+
     def setUp(self):
+        super(TestLocalClient, self).setUp()
         self.client = Client(api_base_url=None, auth=None)
+        self.session = settings.Session()
+
+    def tearDown(self):
+        self.session.query(models.Pool).delete()
+        self.session.commit()
+        self.session.close()
+        super(TestLocalClient, self).tearDown()
 
     @patch.object(models.DAG, 'create_dagrun')
     def test_trigger_dag(self, mock):
@@ -104,4 +121,24 @@ class TestLocalClient(unittest.TestCase):
                                          external_trigger=True)
             mock.reset_mock()
 
-            # this is a unit test only, cannot verify existing dag run
+    def test_get_pool(self):
+        self.client.create_pool(name='foo', slots=1, description='')
+        pool = self.client.get_pool(name='foo')
+        self.assertEqual(pool, ('foo', 1, ''))
+
+    def test_get_pools(self):
+        self.client.create_pool(name='foo1', slots=1, description='')
+        self.client.create_pool(name='foo2', slots=2, description='')
+        pools = sorted(self.client.get_pools(), key=lambda p: p[0])
+        self.assertEqual(pools, [('foo1', 1, ''), ('foo2', 2, '')])
+
+    def test_create_pool(self):
+        pool = self.client.create_pool(name='foo', slots=1, description='')
+        self.assertEqual(pool, ('foo', 1, ''))
+        self.assertEqual(self.session.query(models.Pool).count(), 1)
+
+    def test_delete_pool(self):
+        self.client.create_pool(name='foo', slots=1, description='')
+        self.assertEqual(self.session.query(models.Pool).count(), 1)
+        self.client.delete_pool(name='foo')
+        self.assertEqual(self.session.query(models.Pool).count(), 0)

tests/api/common/experimental/__init__.py

@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

tests/api/common/experimental/mark_tasks.py

@@ -11,7 +11,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-#
 
 import unittest
 
@@ -27,6 +26,7 @@ DEV_NULL = "/dev/null"
 
 
 class TestMarkTasks(unittest.TestCase):
+
     def setUp(self):
         self.dagbag = models.DagBag(include_examples=True)
         self.dag1 = self.dagbag.dags['test_example_bash_operator']
@@ -52,6 +52,16 @@ class TestMarkTasks(unittest.TestCase):
 
         self.session = Session()
 
+    def tearDown(self):
+        self.dag1.clear()
+        self.dag2.clear()
+
+        # just to make sure we are fully cleaned up
+        self.session.query(models.DagRun).delete()
+        self.session.query(models.TaskInstance).delete()
+        self.session.commit()
+        self.session.close()
+
     def snapshot_state(self, dag, execution_dates):
         TI = models.TaskInstance
         tis = self.session.query(TI).filter(
@@ -197,16 +207,6 @@ class TestMarkTasks(unittest.TestCase):
         self.verify_state(self.dag2, task_ids, [self.execution_dates[0]],
                           State.SUCCESS, [])
 
-    def tearDown(self):
-        self.dag1.clear()
-        self.dag2.clear()
-
-        # just to make sure we are fully cleaned up
-        self.session.query(models.DagRun).delete()
-        self.session.query(models.TaskInstance).delete()
-        self.session.commit()
-
-        self.session.close()
 
 class TestMarkDAGRun(unittest.TestCase):
     def setUp(self):

tests/api/common/experimental/test_pool.py

@@ -0,0 +1,132 @@
+# -*- coding: utf-8 -*-
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+
+from airflow.api.common.experimental import pool as pool_api
+from airflow import models
+from airflow import settings
+
+
+class TestPool(unittest.TestCase):
+
+    def setUp(self):
+        super(TestPool, self).setUp()
+        self.session = settings.Session()
+        self.pools = []
+        for i in range(2):
+            name = 'experimental_%s' % (i + 1)
+            pool = models.Pool(
+                pool=name,
+                slots=i,
+                description=name,
+            )
+            self.session.add(pool)
+            self.pools.append(pool)
+        self.session.commit()
+
+    def tearDown(self):
+        self.session.query(models.Pool).delete()
+        self.session.commit()
+        self.session.close()
+        super(TestPool, self).tearDown()
+
+    def test_get_pool(self):
+        pool = pool_api.get_pool(name=self.pools[0].pool, session=self.session)
+        self.assertEqual(pool.pool, self.pools[0].pool)
+
+    def test_get_pool_non_existing(self):
+        self.assertRaisesRegexp(pool_api.PoolNotFound,
+                                "^Pool 'test' doesn't exist$",
+                                pool_api.get_pool,
+                                name='test',
+                                session=self.session)
+
+    def test_get_pool_bad_name(self):
+        for name in ('', '    '):
+            self.assertRaisesRegexp(pool_api.PoolBadRequest,
+                                    "^Pool name shouldn't be empty$",
+                                    pool_api.get_pool,
+                                    name=name,
+                                    session=self.session)
+
+    def test_get_pools(self):
+        pools = sorted(pool_api.get_pools(session=self.session),
+                       key=lambda p: p.pool)
+        self.assertEqual(pools[0].pool, self.pools[0].pool)
+        self.assertEqual(pools[1].pool, self.pools[1].pool)
+
+    def test_create_pool(self):
+        pool = pool_api.create_pool(name='foo',
+                                    slots=5,
+                                    description='',
+                                    session=self.session)
+        self.assertEqual(pool.pool, 'foo')
+        self.assertEqual(pool.slots, 5)
+        self.assertEqual(pool.description, '')
+        self.assertEqual(self.session.query(models.Pool).count(), 3)
+
+    def test_create_pool_existing(self):
+        pool = pool_api.create_pool(name=self.pools[0].pool,
+                                    slots=5,
+                                    description='',
+                                    session=self.session)
+        self.assertEqual(pool.pool, self.pools[0].pool)
+        self.assertEqual(pool.slots, 5)
+        self.assertEqual(pool.description, '')
+        self.assertEqual(self.session.query(models.Pool).count(), 2)
+
+    def test_create_pool_bad_name(self):
+        for name in ('', '    '):
+            self.assertRaisesRegexp(pool_api.PoolBadRequest,
+                                    "^Pool name shouldn't be empty$",
+                                    pool_api.create_pool,
+                                    name=name,
+                                    slots=5,
+                                    description='',
+                                    session=self.session)
+
+    def test_create_pool_bad_slots(self):
+        self.assertRaisesRegexp(pool_api.PoolBadRequest,
+                                "^Bad value for `slots`: foo$",
+                                pool_api.create_pool,
+                                name='foo',
+                                slots='foo',
+                                description='',
+                                session=self.session)
+
+    def test_delete_pool(self):
+        pool = pool_api.delete_pool(name=self.pools[0].pool,
+                                    session=self.session)
+        self.assertEqual(pool.pool, self.pools[0].pool)
+        self.assertEqual(self.session.query(models.Pool).count(), 1)
+
+    def test_delete_pool_non_existing(self):
+        self.assertRaisesRegexp(pool_api.PoolNotFound,
+                                "^Pool 'test' doesn't exist$",
+                                pool_api.delete_pool,
+                                name='test',
+                                session=self.session)
+
+    def test_delete_pool_bad_name(self):
+        for name in ('', '    '):
+            self.assertRaisesRegexp(pool_api.PoolBadRequest,
+                                    "^Pool name shouldn't be empty$",
+                                    pool_api.delete_pool,
+                                    name=name,
+                                    session=self.session)
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/core.py

@@ -1062,12 +1062,34 @@ class CoreTest(unittest.TestCase):
 
 
 class CliTests(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super(CliTests, cls).setUpClass()
+        cls._cleanup()
+
     def setUp(self):
+        super(CliTests, self).setUp()
         configuration.load_test_config()
         app = application.create_app()
         app.config['TESTING'] = True
         self.parser = cli.CLIFactory.get_parser()
         self.dagbag = models.DagBag(dag_folder=DEV_NULL, include_examples=True)
+        self.session = Session()
+
+    def tearDown(self):
+        self._cleanup(session=self.session)
+        super(CliTests, self).tearDown()
+
+    @staticmethod
+    def _cleanup(session=None):
+        if session is None:
+            session = Session()
+
+        session.query(models.Pool).delete()
+        session.query(models.Variable).delete()
+        session.commit()
+        session.close()
 
     def test_cli_list_dags(self):
         args = self.parser.parse_args(['list_dags', '--report'])
@@ -1100,8 +1122,8 @@ class CliTests(unittest.TestCase):
             cli.connections(self.parser.parse_args(['connections', '--list']))
             stdout = mock_stdout.getvalue()
         conns = [[x.strip("'") for x in re.findall("'\w+'", line)[:2]]
-                  for ii, line in enumerate(stdout.split('\n'))
-                  if ii % 2 == 1]
+                 for ii, line in enumerate(stdout.split('\n'))
+                 if ii % 2 == 1]
         conns = [conn for conn in conns if len(conn) > 0]
 
         # Assert that some of the connections are present in the output as
@@ -1365,14 +1387,27 @@ class CliTests(unittest.TestCase):
                 '-c', 'NOT JSON'])
         )
 
-    def test_pool(self):
-        # Checks if all subcommands are properly received
-        cli.pool(self.parser.parse_args([
-            'pool', '-s', 'foo', '1', '"my foo pool"']))
-        cli.pool(self.parser.parse_args([
-            'pool', '-g', 'foo']))
-        cli.pool(self.parser.parse_args([
-            'pool', '-x', 'foo']))
+    def test_pool_create(self):
+        cli.pool(self.parser.parse_args(['pool', '-s', 'foo', '1', 'test']))
+        self.assertEqual(self.session.query(models.Pool).count(), 1)
+
+    def test_pool_get(self):
+        cli.pool(self.parser.parse_args(['pool', '-s', 'foo', '1', 'test']))
+        try:
+            cli.pool(self.parser.parse_args(['pool', '-g', 'foo']))
+        except Exception as e:
+            self.fail("The 'pool -g foo' command raised unexpectedly: %s" % e)
+
+    def test_pool_delete(self):
+        cli.pool(self.parser.parse_args(['pool', '-s', 'foo', '1', 'test']))
+        cli.pool(self.parser.parse_args(['pool', '-x', 'foo']))
+        self.assertEqual(self.session.query(models.Pool).count(), 0)
+
+    def test_pool_no_args(self):
+        try:
+            cli.pool(self.parser.parse_args(['pool']))
+        except Exception as e:
+            self.fail("The 'pool' command raised unexpectedly: %s" % e)
 
     def test_variables(self):
         # Checks if all subcommands are properly received
@@ -1426,10 +1461,6 @@ class CliTests(unittest.TestCase):
         self.assertEqual('original', models.Variable.get('bar'))
         self.assertEqual('{"foo": "bar"}', models.Variable.get('foo'))
 
-        session = settings.Session()
-        session.query(Variable).delete()
-        session.commit()
-        session.close()
         os.remove('variables1.json')
         os.remove('variables2.json')
 

tests/www/api/experimental/test_endpoints.py

@@ -19,23 +19,36 @@ from urllib.parse import quote_plus
 
 from airflow import configuration
 from airflow.api.common.experimental.trigger_dag import trigger_dag
-from airflow.models import DagBag, DagRun, TaskInstance
+from airflow.models import DagBag, DagRun, Pool, TaskInstance
 from airflow.settings import Session
 from airflow.www import app as application
 
 
-class ApiExperimentalTests(unittest.TestCase):
+class TestApiExperimental(unittest.TestCase):
 
-    def setUp(self):
-        configuration.load_test_config()
-        app = application.create_app(testing=True)
-        self.app = app.test_client()
+    @classmethod
+    def setUpClass(cls):
+        super(TestApiExperimental, cls).setUpClass()
         session = Session()
         session.query(DagRun).delete()
         session.query(TaskInstance).delete()
         session.commit()
         session.close()
 
+    def setUp(self):
+        super(TestApiExperimental, self).setUp()
+        configuration.load_test_config()
+        app = application.create_app(testing=True)
+        self.app = app.test_client()
+
+    def tearDown(self):
+        session = Session()
+        session.query(DagRun).delete()
+        session.query(TaskInstance).delete()
+        session.commit()
+        session.close()
+        super(TestApiExperimental, self).tearDown()
+
     def test_task_info(self):
         url_template = '/api/experimental/dags/{}/tasks/{}'
 
@@ -62,7 +75,7 @@ class ApiExperimentalTests(unittest.TestCase):
         url_template = '/api/experimental/dags/{}/dag_runs'
         response = self.app.post(
             url_template.format('example_bash_operator'),
-            data=json.dumps(dict(run_id='my_run' + datetime.now().isoformat())),
+            data=json.dumps({'run_id': 'my_run' + datetime.now().isoformat()}),
             content_type="application/json"
         )
 
@@ -70,7 +83,7 @@ class ApiExperimentalTests(unittest.TestCase):
 
         response = self.app.post(
             url_template.format('does_not_exist_dag'),
-            data=json.dumps(dict()),
+            data=json.dumps({}),
             content_type="application/json"
         )
         self.assertEqual(404, response.status_code)
@@ -88,7 +101,7 @@ class ApiExperimentalTests(unittest.TestCase):
         # Test Correct execution
         response = self.app.post(
             url_template.format(dag_id),
-            data=json.dumps(dict(execution_date=datetime_string)),
+            data=json.dumps({'execution_date': datetime_string}),
             content_type="application/json"
         )
         self.assertEqual(200, response.status_code)
@@ -103,7 +116,7 @@ class ApiExperimentalTests(unittest.TestCase):
         # Test error for nonexistent dag
         response = self.app.post(
             url_template.format('does_not_exist_dag'),
-            data=json.dumps(dict(execution_date=execution_date.isoformat())),
+            data=json.dumps({'execution_date': execution_date.isoformat()}),
             content_type="application/json"
         )
         self.assertEqual(404, response.status_code)
@@ -111,7 +124,7 @@ class ApiExperimentalTests(unittest.TestCase):
         # Test error for bad datetime format
         response = self.app.post(
             url_template.format(dag_id),
-            data=json.dumps(dict(execution_date='not_a_datetime')),
+            data=json.dumps({'execution_date': 'not_a_datetime'}),
             content_type="application/json"
         )
         self.assertEqual(400, response.status_code)
@@ -122,7 +135,9 @@ class ApiExperimentalTests(unittest.TestCase):
         task_id = 'also_run_this'
         execution_date = datetime.now().replace(microsecond=0)
         datetime_string = quote_plus(execution_date.isoformat())
-        wrong_datetime_string = quote_plus(datetime(1990, 1, 1, 1, 1, 1).isoformat())
+        wrong_datetime_string = quote_plus(
+            datetime(1990, 1, 1, 1, 1, 1).isoformat()
+        )
 
         # Create DagRun
         trigger_dag(dag_id=dag_id,
@@ -139,7 +154,8 @@ class ApiExperimentalTests(unittest.TestCase):
 
         # Test error for nonexistent dag
         response = self.app.get(
-            url_template.format('does_not_exist_dag', datetime_string, task_id),
+            url_template.format('does_not_exist_dag', datetime_string,
+                                task_id),
         )
         self.assertEqual(404, response.status_code)
         self.assertIn('error', response.data.decode('utf-8'))
@@ -164,3 +180,122 @@ class ApiExperimentalTests(unittest.TestCase):
         )
         self.assertEqual(400, response.status_code)
         self.assertIn('error', response.data.decode('utf-8'))
+
+
+class TestPoolApiExperimental(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestPoolApiExperimental, cls).setUpClass()
+        session = Session()
+        session.query(Pool).delete()
+        session.commit()
+        session.close()
+
+    def setUp(self):
+        super(TestPoolApiExperimental, self).setUp()
+        configuration.load_test_config()
+        app = application.create_app(testing=True)
+        self.app = app.test_client()
+        self.session = Session()
+        self.pools = []
+        for i in range(2):
+            name = 'experimental_%s' % (i + 1)
+            pool = Pool(
+                pool=name,
+                slots=i,
+                description=name,
+            )
+            self.session.add(pool)
+            self.pools.append(pool)
+        self.session.commit()
+        self.pool = self.pools[0]
+
+    def tearDown(self):
+        self.session.query(Pool).delete()
+        self.session.commit()
+        self.session.close()
+        super(TestPoolApiExperimental, self).tearDown()
+
+    def _get_pool_count(self):
+        response = self.app.get('/api/experimental/pools')
+        self.assertEqual(response.status_code, 200)
+        return len(json.loads(response.data.decode('utf-8')))
+
+    def test_get_pool(self):
+        response = self.app.get(
+            '/api/experimental/pools/{}'.format(self.pool.pool),
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(json.loads(response.data.decode('utf-8')),
+                         self.pool.to_json())
+
+    def test_get_pool_non_existing(self):
+        response = self.app.get('/api/experimental/pools/foo')
+        self.assertEqual(response.status_code, 404)
+        self.assertEqual(json.loads(response.data.decode('utf-8'))['error'],
+                         "Pool 'foo' doesn't exist")
+
+    def test_get_pools(self):
+        response = self.app.get('/api/experimental/pools')
+        self.assertEqual(response.status_code, 200)
+        pools = json.loads(response.data.decode('utf-8'))
+        self.assertEqual(len(pools), 2)
+        for i, pool in enumerate(sorted(pools, key=lambda p: p['pool'])):
+            self.assertDictEqual(pool, self.pools[i].to_json())
+
+    def test_create_pool(self):
+        response = self.app.post(
+            '/api/experimental/pools',
+            data=json.dumps({
+                'name': 'foo',
+                'slots': 1,
+                'description': '',
+            }),
+            content_type='application/json',
+        )
+        self.assertEqual(response.status_code, 200)
+        pool = json.loads(response.data.decode('utf-8'))
+        self.assertEqual(pool['pool'], 'foo')
+        self.assertEqual(pool['slots'], 1)
+        self.assertEqual(pool['description'], '')
+        self.assertEqual(self._get_pool_count(), 3)
+
+    def test_create_pool_with_bad_name(self):
+        for name in ('', '    '):
+            response = self.app.post(
+                '/api/experimental/pools',
+                data=json.dumps({
+                    'name': name,
+                    'slots': 1,
+                    'description': '',
+                }),
+                content_type='application/json',
+            )
+            self.assertEqual(response.status_code, 400)
+            self.assertEqual(
+                json.loads(response.data.decode('utf-8'))['error'],
+                "Pool name shouldn't be empty",
+            )
+        self.assertEqual(self._get_pool_count(), 2)
+
+    def test_delete_pool(self):
+        response = self.app.delete(
+            '/api/experimental/pools/{}'.format(self.pool.pool),
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(json.loads(response.data.decode('utf-8')),
+                         self.pool.to_json())
+        self.assertEqual(self._get_pool_count(), 1)
+
+    def test_delete_pool_non_existing(self):
+        response = self.app.delete(
+            '/api/experimental/pools/foo',
+        )
+        self.assertEqual(response.status_code, 404)
+        self.assertEqual(json.loads(response.data.decode('utf-8'))['error'],
+                         "Pool 'foo' doesn't exist")
+
+
+if __name__ == '__main__':
+    unittest.main()