Merge pull request #335 from r0fls/remove-loop

remove loop as argument and update examples

examples/aiohttp_example.py

@@ -1,12 +1,8 @@
 from sanic import Sanic
 from sanic.response import json
 
-import uvloop
 import aiohttp
 
-#Create an event loop manually so that we can use it for both sanic & aiohttp
-loop = uvloop.new_event_loop()
-
 app = Sanic(__name__)
 
 async def fetch(session, url):
@@ -24,10 +20,9 @@ async def test(request):
     """
     url = "https://api.github.com/repos/channelcat/sanic"
 
-    async with aiohttp.ClientSession(loop=loop) as session:
+    async with aiohttp.ClientSession() as session:
         response = await fetch(session, url)
         return json(response)
 
 
-app.run(host="0.0.0.0", port=8000, loop=loop)
-
+app.run(host="0.0.0.0", port=8000, workers=2)

examples/limit_concurrency.py

@@ -0,0 +1,36 @@
+from sanic import Sanic
+from sanic.response import json
+
+import asyncio
+import aiohttp
+
+app = Sanic(__name__)
+
+sem = None
+
+def init(sanic, loop):
+    global sem
+    CONCURRENCY_PER_WORKER = 4
+    sem = asyncio.Semaphore(CONCURRENCY_PER_WORKER, loop=loop)
+
+async def bounded_fetch(session, url):
+    """
+    Use session object to perform 'get' request on url
+    """
+    async with sem, session.get(url) as response:
+        return await response.json()
+
+
+@app.route("/")
+async def test(request):
+    """
+    Download and serve example JSON
+    """
+    url = "https://api.github.com/repos/channelcat/sanic"
+
+    async with aiohttp.ClientSession() as session:
+        response = await bounded_fetch(session, url)
+        return json(response)
+
+
+app.run(host="0.0.0.0", port=8000, workers=2, before_start=init)

examples/sanic_aiopg_example.py

@@ -10,8 +10,6 @@ import aiopg
 from sanic import Sanic
 from sanic.response import json
 
-asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
-
 database_name = os.environ['DATABASE_NAME']
 database_host = os.environ['DATABASE_HOST']
 database_user = os.environ['DATABASE_USER']
@@ -21,45 +19,47 @@ connection = 'postgres://{0}:{1}@{2}/{3}'.format(database_user,
                                                  database_password,
                                                  database_host,
                                                  database_name)
-loop = asyncio.get_event_loop()
 
 
 async def get_pool():
     return await aiopg.create_pool(connection)
 
 app = Sanic(name=__name__)
-pool = loop.run_until_complete(get_pool())
-
-
-async def prepare_db():
-    """ Let's create some table and add some data
 
+async def prepare_db(app, loop):
     """
-    async with pool.acquire() as conn:
-        async with conn.cursor() as cur:
-            await cur.execute('DROP TABLE IF EXISTS sanic_polls')
-            await cur.execute("""CREATE TABLE sanic_polls (
-                                    id serial primary key,
-                                    question varchar(50),
-                                    pub_date timestamp
-                                );""")
-            for i in range(0, 100):
-                await cur.execute("""INSERT INTO sanic_polls
-                                (id, question, pub_date) VALUES ({}, {}, now())
-                """.format(i, i))
+    Let's create some table and add some data
+    """
+    async with aiopg.create_pool(connection) as pool:
+        async with pool.acquire() as conn:
+            async with conn.cursor() as cur:
+                await cur.execute('DROP TABLE IF EXISTS sanic_polls')
+                await cur.execute("""CREATE TABLE sanic_polls (
+                                        id serial primary key,
+                                        question varchar(50),
+                                        pub_date timestamp
+                                    );""")
+                for i in range(0, 100):
+                    await cur.execute("""INSERT INTO sanic_polls
+                                    (id, question, pub_date) VALUES ({}, {}, now())
+                    """.format(i, i))
 
 
 @app.route("/")
 async def handle(request):
-    async with pool.acquire() as conn:
-        async with conn.cursor() as cur:
-            result = []
-            await cur.execute("SELECT question, pub_date FROM sanic_polls")
-            async for row in cur:
-                result.append({"question": row[0], "pub_date": row[1]})
-            return json({"polls": result})
-
+    result = []
+    async def test_select():
+        async with aiopg.create_pool(connection) as pool:
+            async with pool.acquire() as conn:
+                async with conn.cursor() as cur:
+                    await cur.execute("SELECT question, pub_date FROM sanic_polls")
+                    async for row in cur:
+                        result.append({"question": row[0], "pub_date": row[1]})
+    res = await test_select()
+    return json({'polls': result})
 
 if __name__ == '__main__':
-    loop.run_until_complete(prepare_db())
-    app.run(host='0.0.0.0', port=8000, loop=loop)
+    app.run(host='0.0.0.0',
+            port=8000,
+            debug=True,
+            before_start=prepare_db)

examples/sanic_aiopg_sqlalchemy_example.py

@@ -12,8 +12,6 @@ import sqlalchemy as sa
 from sanic import Sanic
 from sanic.response import json
 
-asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
-
 database_name = os.environ['DATABASE_NAME']
 database_host = os.environ['DATABASE_HOST']
 database_user = os.environ['DATABASE_USER']
@@ -23,8 +21,6 @@ connection = 'postgres://{0}:{1}@{2}/{3}'.format(database_user,
                                                  database_password,
                                                  database_host,
                                                  database_name)
-loop = asyncio.get_event_loop()
-
 
 metadata = sa.MetaData()
 
@@ -34,40 +30,37 @@ polls = sa.Table('sanic_polls', metadata,
                  sa.Column("pub_date", sa.DateTime))
 
 
-async def get_engine():
-    return await create_engine(connection)
-
 app = Sanic(name=__name__)
-engine = loop.run_until_complete(get_engine())
 
 
-async def prepare_db():
+async def prepare_db(app, loop):
     """ Let's add some data
 
     """
-    async with engine.acquire() as conn:
-        await conn.execute('DROP TABLE IF EXISTS sanic_polls')
-        await conn.execute("""CREATE TABLE sanic_polls (
-                                    id serial primary key,
-                                    question varchar(50),
-                                    pub_date timestamp
-                                );""")
-        for i in range(0, 100):
-            await conn.execute(
-                polls.insert().values(question=i,
-                                      pub_date=datetime.datetime.now())
-                )
+    async with create_engine(connection) as engine:
+        async with engine.acquire() as conn:
+            await conn.execute('DROP TABLE IF EXISTS sanic_polls')
+            await conn.execute("""CREATE TABLE sanic_polls (
+                                        id serial primary key,
+                                        question varchar(50),
+                                        pub_date timestamp
+                                    );""")
+            for i in range(0, 100):
+                await conn.execute(
+                    polls.insert().values(question=i,
+                                          pub_date=datetime.datetime.now())
+                    )
 
 
 @app.route("/")
 async def handle(request):
-    async with engine.acquire() as conn:
-        result = []
-        async for row in conn.execute(polls.select()):
-            result.append({"question": row.question, "pub_date": row.pub_date})
-        return json({"polls": result})
+    async with create_engine(connection) as engine:
+        async with engine.acquire() as conn:
+            result = []
+            async for row in conn.execute(polls.select()):
+                result.append({"question": row.question, "pub_date": row.pub_date})
+            return json({"polls": result})
 
 
 if __name__ == '__main__':
-    loop.run_until_complete(prepare_db())
-    app.run(host='0.0.0.0', port=8000, loop=loop)
+    app.run(host='0.0.0.0', port=8000, before_start=prepare_db)

examples/sanic_asyncpg_example.py

@@ -10,8 +10,6 @@ from asyncpg import create_pool
 from sanic import Sanic
 from sanic.response import json
 
-asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
-
 DB_CONFIG = {
     'host': '<host>',
     'user': '<username>',
@@ -21,45 +19,40 @@ DB_CONFIG = {
 }
 
 def jsonify(records):
-    """ Parse asyncpg record response into JSON format
-
+    """
+    Parse asyncpg record response into JSON format
     """
     return [{key: value for key, value in
              zip(r.keys(), r.values())} for r in records]
 
-loop = asyncio.get_event_loop()
-
-async def make_pool():
-    return await create_pool(**DB_CONFIG)
-
 app = Sanic(__name__)
-pool = loop.run_until_complete(make_pool())
-
-async def create_db():
-    """ Create some table and add some data
 
+async def create_db(app, loop):
     """
-    async with pool.acquire() as connection:
-        async with connection.transaction():
-            await connection.execute('DROP TABLE IF EXISTS sanic_post')
-            await connection.execute("""CREATE TABLE sanic_post (
-                                    id serial primary key,
-                                    content varchar(50),
-                                    post_date timestamp
-                                );""")
-            for i in range(0, 100):
-                await connection.execute(f"""INSERT INTO sanic_post
-                    (id, content, post_date) VALUES ({i}, {i}, now())""")
+    Create some table and add some data
+    """
+    async with create_pool(**DB_CONFIG) as pool:
+        async with pool.acquire() as connection:
+            async with connection.transaction():
+                await connection.execute('DROP TABLE IF EXISTS sanic_post')
+                await connection.execute("""CREATE TABLE sanic_post (
+                                        id serial primary key,
+                                        content varchar(50),
+                                        post_date timestamp
+                                    );""")
+                for i in range(0, 100):
+                    await connection.execute(f"""INSERT INTO sanic_post
+                        (id, content, post_date) VALUES ({i}, {i}, now())""")
 
 
 @app.route("/")
 async def handler(request):
-    async with pool.acquire() as connection:
-        async with connection.transaction():
-            results = await connection.fetch('SELECT * FROM sanic_post')
-            return json({'posts': jsonify(results)})
+    async with create_pool(**DB_CONFIG) as pool:
+        async with pool.acquire() as connection:
+            async with connection.transaction():
+                results = await connection.fetch('SELECT * FROM sanic_post')
+                return json({'posts': jsonify(results)})
 
 
 if __name__ == '__main__':
-    loop.run_until_complete(create_db())
-    app.run(host='0.0.0.0', port=8000, loop=loop)
+    app.run(host='0.0.0.0', port=8000, before_start=create_db)

examples/sanic_peewee.py

@@ -9,19 +9,18 @@ from sanic import Sanic
 from sanic.response import json
 
 ## peewee_async related imports
-import uvloop
 import peewee
 from peewee_async import Manager, PostgresqlDatabase
 
  # we instantiate a custom loop so we can pass it to our db manager
-loop = uvloop.new_event_loop()
 
-database = PostgresqlDatabase(database='test',
-                              host='127.0.0.1',
-                              user='postgres',
-                              password='mysecretpassword')
+def setup(app, loop):
+    database = PostgresqlDatabase(database='test',
+                                  host='127.0.0.1',
+                                  user='postgres',
+                                  password='mysecretpassword')
 
-objects = Manager(database, loop=loop)
+    objects = Manager(database, loop=loop)
 
 ## from peewee_async docs:
 # Also there’s no need to connect and re-connect before executing async queries
@@ -76,5 +75,4 @@ async def get(request):
 
 
 if __name__ == "__main__":
-    app.run(host='0.0.0.0', port=8000, loop=loop)
-
+    app.run(host='0.0.0.0', port=8000, before_start=setup)