Add type annotations and comments

pull/22460/head
Richard Belleville 5 years ago
parent 0c28a9beaf
commit 571a564f51
  1. 2
      examples/python/xds/README.md
  2. 24
      examples/python/xds/server.py

@ -22,7 +22,7 @@ cd grpc/examples/python/xds
```sh
virtualenv venv -p python3
source venv/bin/activate
pip install grpcio protobuf
pip install grpcio protobuf grpcio-reflection grpcio-health-checking
python server.py
```

@ -16,6 +16,7 @@
from concurrent import futures
import argparse
import logging
import multiprocessing
import socket
import grpc
@ -33,31 +34,46 @@ _DESCRIPTION = "A general purpose dummy server."
class Greeter(helloworld_pb2_grpc.GreeterServicer):
def __init__(self, hostname):
def __init__(self, hostname: str):
self._hostname = hostname if hostname else socket.gethostname()
def SayHello(self, request, context):
def SayHello(self, request: helloworld_pb2.HelloRequest,
context: grpc.ServicerContext) -> helloworld_pb2.HelloReply:
return helloworld_pb2.HelloReply(
message=f"Hello {request.name} from {self._hostname}!")
def serve(port, hostname):
server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
server = grpc.server(
futures.ThreadPoolExecutor(max_workers=multiprocessing.cpu_count()))
# Add the application servicer to the server.
helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(hostname), server)
# Create a health check servicer. We use the non-blocking implementation
# to avoid thread starvation.
health_servicer = health.HealthServicer(
experimental_non_blocking=True,
experimental_thread_pool=futures.ThreadPoolExecutor(max_workers=4))
experimental_thread_pool=futures.ThreadPoolExecutor(max_workers=1))
health_pb2_grpc.add_HealthServicer_to_server(health_servicer, server)
# Create a tuple of all of the services we want to export via reflection.
services = tuple(
service.full_name
for service in helloworld_pb2.DESCRIPTOR.services_by_name.values()) + (
reflection.SERVICE_NAME, health.SERVICE_NAME)
# Add the reflection service to the server.
reflection.enable_server_reflection(services, server)
server.add_insecure_port(f"[::]:{port}")
server.start()
# Mark all services as healthy.
overall_server_health = ""
for service in services + (overall_server_health,):
health_servicer.set(service, health_pb2.HealthCheckResponse.SERVING)
# Park the main application thread.
server.wait_for_termination()

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