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refactor: extract request and notification handling #166

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Merged
merged 1 commit into from
Jan 24, 2025
Merged

refactor: extract request and notification handling #166

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122 changes: 63 additions & 59 deletions src/mcp/server/lowlevel/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -433,73 +433,77 @@ async def run(

match message:
case RequestResponder(request=types.ClientRequest(root=req)):
logger.info(
f"Processing request of type {type(req).__name__}"
await self._handle_request(
message, req, session, raise_exceptions
)
if type(req) in self.request_handlers:
handler = self.request_handlers[type(req)]
logger.debug(
f"Dispatching request of type {type(req).__name__}"
)

token = None
try:
# Set our global state that can be retrieved via
# app.get_request_context()
token = request_ctx.set(
RequestContext(
message.request_id,
message.request_meta,
session,
)
)
response = await handler(req)
except McpError as err:
response = err.error
except Exception as err:
if raise_exceptions:
raise err
response = types.ErrorData(
code=0, message=str(err), data=None
)
finally:
# Reset the global state after we are done
if token is not None:
request_ctx.reset(token)

await message.respond(response)
else:
await message.respond(
types.ErrorData(
code=types.METHOD_NOT_FOUND,
message="Method not found",
)
)

logger.debug("Response sent")
case types.ClientNotification(root=notify):
if type(notify) in self.notification_handlers:
assert type(notify) in self.notification_handlers

handler = self.notification_handlers[type(notify)]
logger.debug(
f"Dispatching notification of type "
f"{type(notify).__name__}"
)

try:
await handler(notify)
except Exception as err:
logger.error(
f"Uncaught exception in notification handler: "
f"{err}"
)
await self._handle_notification(notify)

for warning in w:
logger.info(
f"Warning: {warning.category.__name__}: {warning.message}"
)

async def _handle_request(
self,
message: RequestResponder,
req: Any,
session: ServerSession,
raise_exceptions: bool,
):
logger.info(f"Processing request of type {type(req).__name__}")
if type(req) in self.request_handlers:
handler = self.request_handlers[type(req)]
logger.debug(f"Dispatching request of type {type(req).__name__}")

token = None
try:
# Set our global state that can be retrieved via
# app.get_request_context()
token = request_ctx.set(
RequestContext(
message.request_id,
message.request_meta,
session,
)
)
response = await handler(req)
except McpError as err:
response = err.error
except Exception as err:
if raise_exceptions:
raise err
response = types.ErrorData(code=0, message=str(err), data=None)
finally:
# Reset the global state after we are done
if token is not None:
request_ctx.reset(token)

await message.respond(response)
else:
await message.respond(
types.ErrorData(
code=types.METHOD_NOT_FOUND,
message="Method not found",
)
)

logger.debug("Response sent")

async def _handle_notification(self, notify: Any):
if type(notify) in self.notification_handlers:
assert type(notify) in self.notification_handlers

handler = self.notification_handlers[type(notify)]
logger.debug(
f"Dispatching notification of type " f"{type(notify).__name__}"
)

try:
await handler(notify)
except Exception as err:
logger.error(f"Uncaught exception in notification handler: " f"{err}")


async def _ping_handler(request: types.PingRequest) -> types.ServerResult:
return types.ServerResult(types.EmptyResult())
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