La bibliothèque cliente .NET utilise en interne des intercepteurs gRPC à des fins de journalisation, mais elle vous permet également d'ajouter vos propres intercepteurs gRPC personnalisés. Cette fonctionnalité permet de consigner des métriques dans un agrégateur de journaux personnalisé ou de transformer les requêtes de l'API Google Ads.
Pour ajouter un intercepteur gRPC personnalisé, implémentez une classe qui étend la classe Grpc.Core.Interceptors.Interceptor et associez-la à votre GoogleAdsClient avec la méthode AddInterceptor.
Notez que l'interception de requêtes gRPC en streaming et non en streaming nécessite de remplacer deux méthodes différentes de la classe Interceptor : AsyncUnaryCall et AsyncServerStreamingCall, respectivement.
L'espace de noms Google.Ads.Gax.Interceptors fournit des classes utilitaires qui peuvent être utilisées dans les intercepteurs personnalisés pour faciliter le traitement des exceptions.
L'exemple de code suivant met en œuvre un intercepteur d'appels gRPC en streaming et non en streaming:
// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
using CommandLine;
using Google.Api.Gax;
using Google.Ads.Gax.Examples;
using Google.Ads.Gax.Interceptors;
using Google.Ads.GoogleAds.Lib;
using Google.Ads.GoogleAds.V16.Errors;
using Google.Ads.GoogleAds.V16.Services;
using Grpc.Core;
using Grpc.Core.Interceptors;
using System;
using System.Threading.Tasks;
namespace Google.Ads.GoogleAds.Examples.V16
{
/// <summary>
/// This code example shows how to add a custom gRPC interceptor.
/// </summary>
public class AddCustomGrpcInterceptor : ExampleBase
{
/// <summary>
/// Command line options for running the <see cref="AddCustomGrpcInterceptor"/> example.
/// </summary>
public class Options : OptionsBase
{
/// <summary>
/// The Google Ads customer ID for which the call is made.
/// </summary>
[Option("customerId", Required = true, HelpText =
"The Google Ads customer ID for which the call is made.")]
public long CustomerId { get; set; }
}
/// <summary>
/// Main method, to run this code example as a standalone application.
/// </summary>
/// <param name="args">The command line arguments.</param>
public static void Main(string[] args)
{
Options options = ExampleUtilities.ParseCommandLine<Options>(args);
AddCustomGrpcInterceptor codeExample = new AddCustomGrpcInterceptor();
Console.WriteLine(codeExample.Description);
GoogleAdsClient client = new GoogleAdsClient();
// Add a custom interceptor.
client.AddInterceptor(new CustomInterceptor());
codeExample.Run(client,
options.CustomerId);
}
/// <summary>
/// Returns a description about the code example.
/// </summary>
public override string Description =>
"This code example shows how to add a custom gRPC interceptor.";
/// <summary>
/// Runs the code example.
/// </summary>
/// <param name="client">The Google Ads client.</param>
/// <param name="customerId">The Google Ads customer ID for which the call is made.</param>
public void Run(GoogleAdsClient client, long customerId)
{
// Get the GoogleAdsService.
GoogleAdsServiceClient googleAdsService = client.GetService(
Services.V16.GoogleAdsService);
// Create a query that will retrieve all campaigns, just to demonstrate usage of the
// custom interceptor.
string query = @"SELECT
campaign.id,
FROM campaign
ORDER BY campaign.id";
try
{
// Issue a streaming search request; we don't need to do anything with the response
// here, we just want to demonstrate usage of the interceptor.
googleAdsService.SearchStream(customerId.ToString(), query,
delegate (SearchGoogleAdsStreamResponse resp){}
);
}
catch (GoogleAdsException e)
{
Console.WriteLine("Failure:");
Console.WriteLine($"Message: {e.Message}");
Console.WriteLine($"Failure: {e.Failure}");
Console.WriteLine($"Request ID: {e.RequestId}");
throw;
}
try
{
// Issue a non-streaming call.
PagedEnumerable<SearchGoogleAdsResponse, GoogleAdsRow> response =
googleAdsService.Search(customerId.ToString(), query);
foreach (GoogleAdsRow googleAdsRow in response)
{
// The response for Search is lazy, meaning that the actual gRPC call will be
// sent only when the response is actually accessed; to demonstrate usage of
// the interceptor, then, we need to ensure the call is sent by looping
// through the response results.
Console.WriteLine("Campaign with ID {0} was found.",
googleAdsRow.Campaign.Id, googleAdsRow.Campaign.Name);
}
}
catch (GoogleAdsException e)
{
Console.WriteLine("Failure:");
Console.WriteLine($"Message: {e.Message}");
Console.WriteLine($"Failure: {e.Failure}");
Console.WriteLine($"Request ID: {e.RequestId}");
throw;
}
}
}
/// <summary>
/// A custom interceptor for both streaming and non-streaming gRPC calls.
/// </summary>
internal class CustomInterceptor : Interceptor
{
public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(
TRequest request, ClientInterceptorContext<TRequest, TResponse> context,
AsyncUnaryCallContinuation<TRequest, TResponse> continuationCallback)
{
AsyncUnaryCall<TResponse> call = continuationCallback(request, context);
Action<Task<TResponse>> callback = delegate (Task<TResponse> oldTask)
{
Console.WriteLine($"Intercepted a non-streaming call to {context.Method.Name}");
};
return UnaryRpcInterceptor.Intercept(call, callback);
}
public override AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(
TRequest request, ClientInterceptorContext<TRequest, TResponse> context,
AsyncServerStreamingCallContinuation<TRequest, TResponse> continuation)
{
AsyncServerStreamingCall<TResponse> call = continuation(request, context);
StreamingRpcInterceptor<TResponse> responseStream = null;
responseStream = new StreamingRpcInterceptor<TResponse>(call.ResponseStream,
delegate (TResponse response, AggregateException rpcException)
{
Console.WriteLine($"Intercepted a streaming call to {context.Method.Name}");
});
return new AsyncServerStreamingCall<TResponse>(
responseStream,
call.ResponseHeadersAsync,
call.GetStatus,
call.GetTrailers,
call.Dispose
);
}
}
}