在代码中配置适用于 C++ 的 AWS SDK 服务客户端

当直接在代码中处理配置时，配置范围仅限于使用该代码的应用程序。在该应用程序中，您可选择以下配置方式：对所有服务客户端的全局配置、对某一特定 AWS 服务类型所有客户端的配置，或对某个具体服务客户端实例的配置。

适用于 C++ 的 AWS SDK 包含 AWS 服务客户端类，这些类提供了与您应用程序中使用的 AWS 服务进行交互的功能。在适用于 C++ 的 SDK 中，您可以更改默认客户端配置，这在您想要执行以下操作时非常有用：

ClientConfiguration 是适用于 C++ 的 SDK 中的一个结构，您可以在代码中将其实例化并加以使用。以下代码段说明了如何使用该类通过代理访问 Amazon S3。

Aws::Client::ClientConfiguration clientConfig;
clientConfig.proxyHost = "localhost";
clientConfig.proxyPort = 1234;
clientConfig.proxyScheme = Aws::Http::Scheme::HTTPS;
Aws::S3::S3Client(clientConfig);

配置变量声明

ClientConfiguration 结构声明了以下成员变量：

Aws::String accountId;
Aws::String accountIdEndpointMode = "preferred";
bool allowSystemProxy = false;
Aws::String appId;
Aws::String caPath;
Aws::String caFile;

struct {
  RequestChecksumCalculation requestChecksumCalculation = RequestChecksumCalculation::WHEN_SUPPORTED;
  ResponseChecksumValidation responseChecksumValidation = ResponseChecksumValidation::WHEN_SUPPORTED;
} checksumConfig;

ProviderFactories configFactories = ProviderFactories::defaultFactories;
long connectTimeoutMs = 1000;

struct CredentialProviderConfiguration {
    Aws::String profile;
    Aws::String region;
    struct {
        long metadataServiceNumAttempts = 1;
        long metadataServiceTimeout = 1;
        std::shared_ptr<RetryStrategy> imdsRetryStrategy;
        bool disableImdsV1;
        bool disableImds;
    } imdsConfig;
    struct STSCredentialsCredentialProviderConfiguration {
        Aws::String roleArn;
        Aws::String sessionName;
        Aws::String tokenFilePath;
        std::chrono::milliseconds retrieveCredentialsFutureTimeout = std::chrono::seconds(10);
    } stsCredentialsProviderConfig;
} credentialProviderConfig;

bool disableExpectHeader = false;
bool disableIMDS = false;
bool disableImdsV1 = false;
bool enableClockSkewAdjustment = true;
Aws::Crt::Optional<bool> enableEndpointDiscovery;
bool enableHostPrefixInjection = true;
bool enableHttpClientTrace = false;
bool enableTcpKeepAlive = true;
Aws::String endpointOverride;
std::shared_ptr<Aws::Utils::Threading::Executor> executor = nullptr;
FollowRedirectsPolicy followRedirects;
Aws::Http::TransferLibType httpLibOverride;
Aws::Http::TransferLibPerformanceMode httpLibPerfMode = Http::TransferLibPerformanceMode::LOW_LATENCY;
long httpRequestTimeoutMs = 0;
unsigned long lowSpeedLimit = 1;
unsigned maxConnections = 25;
Aws::Utils::Array<Aws::String> nonProxyHosts;
Aws::String profileName;
Aws::String proxyCaFile;
Aws::String proxyCaPath;
Aws::Http::Scheme proxyScheme;
Aws::String proxyHost;
unsigned proxyPort = 0;
Aws::String proxyUserName;
Aws::String proxyPassword;
Aws::String proxySSLCertPath;
Aws::String proxySSLCertType;
Aws::String proxySSLKeyPath;
Aws::String proxySSLKeyType;
Aws::String proxySSLKeyPassword;
std::shared_ptr<Aws::Utils::RateLimits::RateLimiterInterface> readRateLimiter = nullptr;
Aws::String region;
Aws::Client::RequestCompressionConfig requestCompressionConfig;
long requestTimeoutMs = 0;
std::shared_ptr<RetryStrategy> retryStrategy = nullptr;
Aws::Http::Scheme scheme;
unsigned long tcpKeepAliveIntervalMs = 30000;
std::shared_ptr<smithy::components::tracing::TelemetryProvider> telemetryProvider;
Aws::String userAgent;
bool useDualStack = false;
bool useFIPS = false;
bool verifySSL = true;
Aws::Http::Version version = Http::Version::HTTP_VERSION_2TLS;

struct WinHTTPOptions {
  bool useAnonymousAuth = false;
} winHTTPOptions;

std::shared_ptr<Aws::Utils::RateLimits::RateLimiterInterface> writeRateLimiter = nullptr;

static Aws::String LoadConfigFromEnvOrProfile(const Aws::String& envKey, const Aws::String& profile,
                                              const Aws::String& profileProperty, const Aws::Vector<Aws::String>& allowedValues,
                                              const Aws::String& defaultValue);

配置变量描述

以下列表介绍了可用于自定义客户端行为的 ClientConfiguration 成员变量。