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Move Config#load out of Server#serve to enable Eager Asynchronous Construction of App #942

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Move Config#load out of Server#serve to enable Eager Asynchronous Construction of App #942

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4 changes: 4 additions & 0 deletions tests/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,10 @@
@asynccontextmanager
async def run_server(config: Config, sockets=None):
server = Server(config=config)

if not config.loaded:
config.load()

cancel_handle = asyncio.ensure_future(server.serve(sockets=sockets))
await asyncio.sleep(0.1)
try:
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9 changes: 6 additions & 3 deletions uvicorn/server.py
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Expand Up @@ -44,16 +44,19 @@ def __init__(self, config):
self.last_notified = 0

def run(self, sockets=None):
self.config.setup_event_loop()
config = self.config
config.setup_event_loop()

if not config.loaded:
config.load()
Comment on lines +47 to +51
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Let's add a comment about why we're doing this here, perhaps?

Suggested change
config = self.config
config.setup_event_loop()
if not config.loaded:
config.load()
# Setup and load app before entering the async environment, so it's possible to
# run any async setup on our side or in the app module.
# See: https://github.com/encode/uvicorn/issues/941
config = self.config
config.setup_event_loop()
if not config.loaded:
config.load()


loop = asyncio.get_event_loop()
loop.run_until_complete(self.serve(sockets=sockets))

async def serve(self, sockets=None):
process_id = os.getpid()

config = self.config
if not config.loaded:
config.load()

self.lifespan = config.lifespan_class(config)

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7 changes: 6 additions & 1 deletion uvicorn/workers.py
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Expand Up @@ -70,7 +70,12 @@ def init_signals(self):
signal.signal(s, signal.SIG_DFL)

def run(self):
self.config.app = self.wsgi
config = self.config
config.app = self.wsgi

if not config.loaded:
config.load()

server = Server(config=self.config)
loop = asyncio.get_event_loop()
loop.run_until_complete(server.serve(sockets=self.sockets))
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