added exercises

grpc/compare.py

+import requests, time, os
+from statistics import median
+
+import grpc
+import helloworld_pb2
+import helloworld_pb2_grpc
+
+
+grpc_svc = os.environ.get("GRPC_SVC", "localhost")
+grpc_port = os.environ.get("GRPC_PORT", "5555")
+rest_svc = os.environ.get("REST_SVC", "localhost")
+rest_port = os.environ.get("REST_PORT", "5000")
+
+channel = grpc.insecure_channel(f"{ grpc_svc }:{ grpc_port }")
+stub = helloworld_pb2_grpc.GreeterStub(channel)
+
+grpc_s = []
+rest_s = []
+
+while True:
+    for i in range(0, 100):
+        start = time.time()
+        response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'))
+        grpc_s.append(time.time() - start)
+
+        start = time.time()
+        x = requests.get(f"http://{ rest_svc }:{ rest_port }/hello/you")
+        rest_s.append(time.time() - start)
+
+    print(f"gRPC: { median(grpc_s) * 1000 :05.2f}ms REST: { median(rest_s) * 1000 :05.2f}ms")

rest/greeter_rest.py

+import flask
+
+app = flask.Flask(__name__)
+
+@app.route('/', methods=['GET'])
+def home():
+    return f"Hello!"
+
+@app.route('/hello/<name>', methods=['GET'])
+def hello(name):
+    return f"Hello, { name.strip() }!"
+
+app.run(host="0.0.0.0")