[英]In C#, How can I reuse an HttpClient for multiple services?
I've created a C# microservice which offers several different (but related) functions.我创建了一个 C# 微服务,它提供了几个不同(但相关)的功能。
I am now creating a C# Nuget package for a client which will help other C# microservices to leverage this microservice.我现在正在为一个客户端创建一个 C# Nuget package,这将帮助其他 ZD7EFA19FBE24D3972FDD2D8Z 微服务利用这个微服务。 This will include a Service Collection Extension class to facilitate adding the client to those microservices.这将包括一个服务集合扩展 class,以方便将客户端添加到这些微服务。
In the interest of separating concerns, within the client, I've separated the functionality into three classes:为了分离关注点,在客户端中,我将功能分为三类:
Each of these need to call out to the same server.这些中的每一个都需要调用同一台服务器。
As a niave first implementation, I've composed this method:作为一个幼稚的第一个实现,我编写了这个方法:
public static IServiceCollection AddSalesforceClients(this IServiceCollection services)
{
services.AddTransient<SalesforceCacheAuthenticationHandler>();
ConfigureClient(services.AddHttpClient<ISalesforceCacheQuerier, SalesforceCacheQuerier>());
ConfigureClient(services.AddHttpClient<ISalesforceCacheSyncDataManipulator, SalesforceCacheSyncDataManipulator>());
ConfigureClient(services.AddHttpClient<ISalesforceCacheAsyncDataManipulator, SalesforceCacheAsyncDataManipulator>());
return services;
}
private static IHttpClientBuilder? ConfigureClient(IHttpClientBuilder? clientBuilder)
=> clientBuilder.ConfigureHttpClient(ConfigureClient)
.ConfigurePrimaryHttpMessageHandler(() => new SocketsHttpHandler())
.AddHttpMessageHandler<SalesforceCacheAuthenticationHandler>();
private static void ConfigureClient(IServiceProvider provider, HttpClient client)
{
SalesforceCacheSettings? settings = provider.GetRequiredService<SalesforceCacheSettings>();
client.BaseAddress = new Uri(settings.BaseUrl, settings.ApiEndpoint);
client.DefaultRequestHeaders.ExpectContinue = true;
}
However, this generates three separate HttpClients and triples the traffic for the "Identity Server" used to provide Jwt tokens.但是,这会生成三个单独的 HttpClient,并将用于提供 Jwt 令牌的“身份服务器”的流量增加三倍。
How can I refactor this to create and reuse only a single HttpClient?如何重构它以仅创建和重用一个 HttpClient?
You can use HttpClientFactory and inject it in ConfigureServices
something like services.AddHttpClient();
您可以使用 HttpClientFactory 并将其注入到ConfigureServices
中,例如services.AddHttpClient();
Later wherever you need client object just give IHttpClientFactory httpClientFactory
in the constructor and you can have access to client object by just asking the factory to create a client.稍后,无论您需要客户端 object,只需在构造函数中提供IHttpClientFactory httpClientFactory
,您就可以通过要求工厂创建客户端来访问客户端 object。
HttpClient = HttpClientFactory.CreateClient();
in this fashion.以这种方式。
In case if you want to hold the authentication for the clients and reuse it.如果您想为客户端保留身份验证并重用它。 I would suggest to maintain a dictionary for each request type.我建议为每种请求类型维护一个字典。
var HttpClients = new Dictionary<string, HttpClient>();
HttpClients.Add(SalesforceCacheQuerierKey, SalesforceCacheQuerierClient);
//assuming all the auth related headers are added to this client object //SalesforceCacheQuerierClient //假设所有与身份验证相关的标头都添加到此客户端 object //SalesforceCacheQuerierClient
and pass these from startup level.并从启动级别传递这些。
What I needed was something like this:我需要的是这样的:
services.AddHttpClient(SALESFORCE_CACHE_CLIENT, (provider, client) =>
{
SalesforceCacheClientSettings? settings = provider.GetRequiredService<SalesforceCacheClientSettings>();
client.BaseAddress = new Uri(settings.BaseUrl, settings.ApiEndpoint);
client.DefaultRequestHeaders.ExpectContinue = true;
})
.AddHttpMessageHandler<SalesforceCacheAuthenticationHandler>();
services.AddHttpClient<ISalesforceCacheQuerier, SalesforceCacheQuerier>(SALESFORCE_CACHE_CLIENT);
services.AddHttpClient<ISalesforceCacheSyncDataManipulator, SalesforceCacheSyncDataManipulator>(SALESFORCE_CACHE_CLIENT);
services.AddHttpClient<ISalesforceCacheAsyncDataManipulator, SalesforceCacheAsyncDataManipulator>(SALESFORCE_CACHE_CLIENT);
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