create client gateway in python

client-gateway/client_gateway.py

+import grpc
+import generated.calculator_pb2 as calculator_pb2
+import generated.calculator_pb2_grpc as calculator_pb2_grpc
+import threading
+
+class ClientGateway:
+    def __init__(self):
+        self.addition_channel = grpc.insecure_channel('localhost:50052')
+        self.multiplication_channel = grpc.insecure_channel('localhost:50053')
+        self.addition_stub = calculator_pb2_grpc.CalculatorStub(self.addition_channel)
+        self.multiplication_stub = calculator_pb2_grpc.CalculatorStub(self.multiplication_channel)
+    
+    def perform_operations(self, a, b):
+        """Send numbers to both addition and multiplication services"""
+        try:
+            addition_thread = threading.Thread(target=self._call_addition, args=(a, b))
+            multiplication_thread = threading.Thread(target=self._call_multiplication, args=(a, b))
+            
+            addition_thread.start()
+            multiplication_thread.start()
+            
+            addition_thread.join()
+            multiplication_thread.join()
+            
+        except grpc.RpcError as e:
+            print(f"Error: {e.code()} - {e.details()}")
+    
+    def _call_addition(self, a, b):
+        """Call addition service"""
+        try:
+            numbers = calculator_pb2.Numbers(a=a, b=b)
+            response = self.addition_stub.Add(numbers)
+            print(f" Addition: {a} + {b} = {response.value}")
+        except grpc.RpcError as e:
+            print(f"Addition Service Error: {e.details()}")
+    
+    def _call_multiplication(self, a, b):
+        """Call multiplication service"""
+        try:
+            numbers = calculator_pb2.Numbers(a=a, b=b)
+            response = self.multiplication_stub.Multiply(numbers)
+            print(f"  Multiplication: {a} × {b} = {response.value}")
+        except grpc.RpcError as e:
+            print(f"Multiplication Service Error: {e.details()}")
+    
+    def get_history(self):
+        """Request operation history from both services"""
+        print("\n Fetching operation history...")
+        self._get_addition_history()
+        self._get_multiplication_history()
+    
+    def _get_addition_history(self):
+        """Get addition operation history"""
+        try:
+            response_stream = self.addition_stub.GetOperationHistory(calculator_pb2.Empty())
+            print("\nAddition Operation History:")
+            for history in response_stream:
+                for op in history.operations:
+                    print(f"  {op.timestamp}: {op.a} + {op.b} = {op.result}")
+        except grpc.RpcError as e:
+            print(f"Error getting addition history: {e.details()}")
+    
+    def _get_multiplication_history(self):
+        """Get multiplication operation history"""
+        try:
+            response_stream = self.multiplication_stub.GetOperationHistory(calculator_pb2.Empty())
+            print("\nMultiplication Operation History:")
+            for history in response_stream:
+                for op in history.operations:
+                    print(f"  {op.timestamp}: {op.a} × {op.b} = {op.result}")
+        except grpc.RpcError as e:
+            print(f"Error getting multiplication history: {e.details()}")
+
+def main():
+    client = ClientGateway()
+    
+    while True:
+        print("\n" + "="*50)
+        print(" Distributed Calculator System")
+        print("1. Perform calculations")
+        print("2. Show operation history")
+        print("3. Exit")
+        
+        choice = input("Choose option: ")
+        
+        if choice == "1":
+            try:
+                a = int(input("Enter first number: "))
+                b = int(input("Enter second number: "))
+                client.perform_operations(a, b)
+            except ValueError:
+                print(" Please enter valid integers only!")
+        
+        elif choice == "2":
+            client.get_history()
+        
+        elif choice == "3":
+            print("👋 Goodbye!")
+            break
+        
+        else:
+            print(" Invalid choice!")
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file

client-gateway/generated/calculator_pb2.py

+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# NO CHECKED-IN PROTOBUF GENCODE
+# source: calculator.proto
+# Protobuf Python Version: 6.31.1
+"""Generated protocol buffer code."""
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import runtime_version as _runtime_version
+from google.protobuf import symbol_database as _symbol_database
+from google.protobuf.internal import builder as _builder
+_runtime_version.ValidateProtobufRuntimeVersion(
+    _runtime_version.Domain.PUBLIC,
+    6,
+    31,
+    1,
+    '',
+    'calculator.proto'
+)
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x10\x63\x61lculator.proto\x12\ncalculator\"\x1f\n\x07Numbers\x12\t\n\x01\x61\x18\x01 \x01(\x05\x12\t\n\x01\x62\x18\x02 \x01(\x05\"*\n\x06Result\x12\r\n\x05value\x18\x01 \x01(\x05\x12\x11\n\toperation\x18\x02 \x01(\t\"S\n\x10OperationHistory\x12\x14\n\x0cservice_name\x18\x01 \x01(\t\x12)\n\noperations\x18\x02 \x03(\x0b\x32\x15.calculator.Operation\"R\n\tOperation\x12\x0c\n\x04type\x18\x01 \x01(\t\x12\t\n\x01\x61\x18\x02 \x01(\x05\x12\t\n\x01\x62\x18\x03 \x01(\x05\x12\x0e\n\x06result\x18\x04 \x01(\x05\x12\x11\n\ttimestamp\x18\x05 \x01(\t\"\x07\n\x05\x45mpty2\xbb\x01\n\nCalculator\x12.\n\x03\x41\x64\x64\x12\x13.calculator.Numbers\x1a\x12.calculator.Result\x12\x33\n\x08Multiply\x12\x13.calculator.Numbers\x1a\x12.calculator.Result\x12H\n\x13GetOperationHistory\x12\x11.calculator.Empty\x1a\x1c.calculator.OperationHistory0\x01\x42+\n\'com.calculator.multiplication.generatedP\x01\x62\x06proto3')
+
+_globals = globals()
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'calculator_pb2', _globals)
+if not _descriptor._USE_C_DESCRIPTORS:
+  _globals['DESCRIPTOR']._loaded_options = None
+  _globals['DESCRIPTOR']._serialized_options = b'\n\'com.calculator.multiplication.generatedP\001'
+  _globals['_NUMBERS']._serialized_start=32
+  _globals['_NUMBERS']._serialized_end=63
+  _globals['_RESULT']._serialized_start=65
+  _globals['_RESULT']._serialized_end=107
+  _globals['_OPERATIONHISTORY']._serialized_start=109
+  _globals['_OPERATIONHISTORY']._serialized_end=192
+  _globals['_OPERATION']._serialized_start=194
+  _globals['_OPERATION']._serialized_end=276
+  _globals['_EMPTY']._serialized_start=278
+  _globals['_EMPTY']._serialized_end=285
+  _globals['_CALCULATOR']._serialized_start=288
+  _globals['_CALCULATOR']._serialized_end=475
+# @@protoc_insertion_point(module_scope)

client-gateway/generated/calculator_pb2_grpc.py

+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+"""Client and server classes corresponding to protobuf-defined services."""
+import grpc
+import warnings
+
+import calculator_pb2 as calculator__pb2
+
+GRPC_GENERATED_VERSION = '1.76.0'
+GRPC_VERSION = grpc.__version__
+_version_not_supported = False
+
+try:
+    from grpc._utilities import first_version_is_lower
+    _version_not_supported = first_version_is_lower(GRPC_VERSION, GRPC_GENERATED_VERSION)
+except ImportError:
+    _version_not_supported = True
+
+if _version_not_supported:
+    raise RuntimeError(
+        f'The grpc package installed is at version {GRPC_VERSION},'
+        + ' but the generated code in calculator_pb2_grpc.py depends on'
+        + f' grpcio>={GRPC_GENERATED_VERSION}.'
+        + f' Please upgrade your grpc module to grpcio>={GRPC_GENERATED_VERSION}'
+        + f' or downgrade your generated code using grpcio-tools<={GRPC_VERSION}.'
+    )
+
+
+class CalculatorStub(object):
+    """Missing associated documentation comment in .proto file."""
+
+    def __init__(self, channel):
+        """Constructor.
+
+        Args:
+            channel: A grpc.Channel.
+        """
+        self.Add = channel.unary_unary(
+                '/calculator.Calculator/Add',
+                request_serializer=calculator__pb2.Numbers.SerializeToString,
+                response_deserializer=calculator__pb2.Result.FromString,
+                _registered_method=True)
+        self.Multiply = channel.unary_unary(
+                '/calculator.Calculator/Multiply',
+                request_serializer=calculator__pb2.Numbers.SerializeToString,
+                response_deserializer=calculator__pb2.Result.FromString,
+                _registered_method=True)
+        self.GetOperationHistory = channel.unary_stream(
+                '/calculator.Calculator/GetOperationHistory',
+                request_serializer=calculator__pb2.Empty.SerializeToString,
+                response_deserializer=calculator__pb2.OperationHistory.FromString,
+                _registered_method=True)
+
+
+class CalculatorServicer(object):
+    """Missing associated documentation comment in .proto file."""
+
+    def Add(self, request, context):
+        """Missing associated documentation comment in .proto file."""
+        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+        context.set_details('Method not implemented!')
+        raise NotImplementedError('Method not implemented!')
+
+    def Multiply(self, request, context):
+        """Missing associated documentation comment in .proto file."""
+        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+        context.set_details('Method not implemented!')
+        raise NotImplementedError('Method not implemented!')
+
+    def GetOperationHistory(self, request, context):
+        """Missing associated documentation comment in .proto file."""
+        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+        context.set_details('Method not implemented!')
+        raise NotImplementedError('Method not implemented!')
+
+
+def add_CalculatorServicer_to_server(servicer, server):
+    rpc_method_handlers = {
+            'Add': grpc.unary_unary_rpc_method_handler(
+                    servicer.Add,
+                    request_deserializer=calculator__pb2.Numbers.FromString,
+                    response_serializer=calculator__pb2.Result.SerializeToString,
+            ),
+            'Multiply': grpc.unary_unary_rpc_method_handler(
+                    servicer.Multiply,
+                    request_deserializer=calculator__pb2.Numbers.FromString,
+                    response_serializer=calculator__pb2.Result.SerializeToString,
+            ),
+            'GetOperationHistory': grpc.unary_stream_rpc_method_handler(
+                    servicer.GetOperationHistory,
+                    request_deserializer=calculator__pb2.Empty.FromString,
+                    response_serializer=calculator__pb2.OperationHistory.SerializeToString,
+            ),
+    }
+    generic_handler = grpc.method_handlers_generic_handler(
+            'calculator.Calculator', rpc_method_handlers)
+    server.add_generic_rpc_handlers((generic_handler,))
+    server.add_registered_method_handlers('calculator.Calculator', rpc_method_handlers)
+
+
+ # This class is part of an EXPERIMENTAL API.
+class Calculator(object):
+    """Missing associated documentation comment in .proto file."""
+
+    @staticmethod
+    def Add(request,
+            target,
+            options=(),
+            channel_credentials=None,
+            call_credentials=None,
+            insecure=False,
+            compression=None,
+            wait_for_ready=None,
+            timeout=None,
+            metadata=None):
+        return grpc.experimental.unary_unary(
+            request,
+            target,
+            '/calculator.Calculator/Add',
+            calculator__pb2.Numbers.SerializeToString,
+            calculator__pb2.Result.FromString,
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+            _registered_method=True)
+
+    @staticmethod
+    def Multiply(request,
+            target,
+            options=(),
+            channel_credentials=None,
+            call_credentials=None,
+            insecure=False,
+            compression=None,
+            wait_for_ready=None,
+            timeout=None,
+            metadata=None):
+        return grpc.experimental.unary_unary(
+            request,
+            target,
+            '/calculator.Calculator/Multiply',
+            calculator__pb2.Numbers.SerializeToString,
+            calculator__pb2.Result.FromString,
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+            _registered_method=True)
+
+    @staticmethod
+    def GetOperationHistory(request,
+            target,
+            options=(),
+            channel_credentials=None,
+            call_credentials=None,
+            insecure=False,
+            compression=None,
+            wait_for_ready=None,
+            timeout=None,
+            metadata=None):
+        return grpc.experimental.unary_stream(
+            request,
+            target,
+            '/calculator.Calculator/GetOperationHistory',
+            calculator__pb2.Empty.SerializeToString,
+            calculator__pb2.OperationHistory.FromString,
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+            _registered_method=True)

client-gateway/requirments.txt

+grpcio==1.60.0
+grpcio-tools==1.60.0
\ No newline at end of file