Namespace google::cloud (2.16.0)

Contains all the Google Cloud C++ Library APIs.

Classes

AsyncOperation

Represents a pending asynchronous operation.

AsyncStreamingReadWriteRpc<Request, Response>

A streaming read-write RPC.

BackgroundThreads

A object representing the background threads available to a Client.

CompletionQueue

Call the functor associated with asynchronous operations when they complete.

ConnectionOptions<ConnectionTraits>

The configuration parameters for client connections.

Credentials

An opaque representation of the authentication configuration.

ErrorInfo

Describes the cause of the error with structured details.

future<T>

Implement ISO/IEC TS 19571:2016 future<T>.

future< void >

Specialize ISO/IEC TS 19571:2016 future for void.

GenericPollingPolicy<Retry, Backoff>

Construct a polling policy from existing Retry and Backoff policies.

KmsKeyName

This class identifies a Google Cloud KMS Key.

Location

A representation of a Cloud Location.

LogBackend

The logging backend interface.

Logger<bool>

Define the class to capture a log message.

Logger< false >

Define the logger for a disabled log level.

LogSink

A sink to receive log records.

Options

A class that holds option structs indexed by their type.

PollingPolicy

Control the Cloud C++ client library behavior with respect to polling on long running operations.

Project

This class identifies a Cloud Project.

promise<T>

Implement ISO/IEC TS 19571:2016 promise<T>.

promise< void >

Specialize ISO/IEC TS 19571:2016 promise for void.

ProxyConfig

The configuration for a HTTP Proxy.

RetryPolicy

Define the interface for retry policies.

RuntimeStatusError

A runtime error that wraps a google::cloud::Status.

Status

Represents success or an error with info about the error.

StatusOr<T>

Holds a value or a Status indicating why there is no value.

StreamRange<T>

A StreamRange<T> is a range of StatusOr<T> where the end-of-stream is indicated by a non-OK Status.

TracingOptions

The configuration parameters for RPC/protobuf tracing.

Structs

AccessToken

Represents an access token with a known expiration time.

AccessTokenLifetimeOption

Configure the access token lifetime.

AsyncTimerResult

The result of an async timer operation.

AuthorityOption

Configure the "authority" attribute.

CARootsFilePathOption

Configures a custom CA (Certificates Authority) certificates file.

DelegatesOption

Configure the delegates for MakeImpersonateServiceAccountCredentials()

EndpointOption

Change the endpoint.

ExperimentalTag

An argument type to indicate experimental functions.

GrpcBackgroundThreadPoolSizeOption

The size of the background thread pool.

GrpcBackgroundThreadsFactoryOption

Changes the BackgroundThreadsFactory.

GrpcChannelArgumentsNativeOption

The native grpc::ChannelArguments object.

GrpcChannelArgumentsOption

A string-string map of arguments for grpc::ChannelArguments::SetString.

GrpcCompletionQueueOption

The CompletionQueue to use for background gRPC work.

GrpcCredentialOption

The gRPC credentials used by clients configured with this object.

GrpcNumChannelsOption

The number of transport channels to create.

GrpcTracingOptionsOption

The TracingOptions to use when printing grpc protocol buffer messages.

LogRecord

Represents a single log message.

NullStream

Implements operator<< for all types, without any effect.

OpenTelemetryTracingOption

Enables tracing with OpenTelemetry

ProxyOption

Configure the HTTP Proxy.

QuotaUserOption

Configure the QuotaUser system parameter.

RestTracingOptionsOption

The TracingOptions to use when printing REST transport http messages.

ScopesOption

Configure the scopes for MakeImpersonateServiceAccountCredentials()

ServerTimeoutOption

Timeout for the server to finish processing the request.

TracingComponentsOption

Return whether tracing is enabled for the given component.

UnifiedCredentialsOption

A wrapper to store credentials into an options.

UserAgentProductsOption

User-agent products to include with each request.

UserIpOption

Configure the UserIp query parameter.

UserProjectOption

Specifies a project for quota and billing purposes.

Enums

Idempotency

Whether a request is idempotent.

Severity

Define the severity levels for Google Cloud Platform C++ Libraries logging.

StatusCode

Well-known status codes with grpc::StatusCode-compatible values.

Functions

MakeInsecureCredentials(Options)

Create insecure (aka anonymous, aka unauthenticated) credentials.

These credentials are mostly intended for testing. Integration tests running against an emulator do not need to authenticate. In fact, it may be impossible to connect to an emulator using SSL/TLS because the emulators typically run without secure communication.

In addition, unit tests may benefit from using these credentials: loading the default credentials unnecessarily slows down the unit tests, and in some CI environments the credentials may fail to load, creating confusing warnings and sometimes even errors.

Parameter
Name Description
opts

optional configuration values. Note that the effect of these parameters depends on the underlying transport. For example, TracingComponentsOption is ignored by gRPC-based services.

Returns
Type Description
std::shared_ptr< Credentials >

MakeGoogleDefaultCredentials(Options)

Creates the default credentials.

These are the most commonly used credentials, and are expected to meet the needs of most applications. The Google Default Credentials conform to aip/4110. Consider using these credentials when:

  • Your application is deployed to a GCP environment such as GCE, GKE, or Cloud Run. Each of these deployment environments provides a default service account to the application, and offers mechanisms to change the default credentials without any code changes to your application.
  • You are testing or developing the application on a workstation (physical or virtual). These credentials will use your preferences as set with gcloud auth application-default. These preferences can be your own GCP user credentials, or some service account.
  • Regardless of where your application is running, you can use the GOOGLE_APPLICATION_CREDENTIALS environment variable to override the defaults. This environment variable should point to a file containing a service account key file, or a JSON object describing your user credentials.
See Also

https://cloud.google.com/docs/authentication for more information on authentication in GCP.

Parameter
Name Description
opts

optional configuration values. Note that the effect of these parameters depends on the underlying transport. For example, TracingComponentsOption is ignored by gRPC-based services.

Returns
Type Description
std::shared_ptr< Credentials >

MakeAccessTokenCredentials(std::string const &, std::chrono::system_clock::time_point, Options)

Creates credentials with a fixed access token.

These credentials are useful when using an out-of-band mechanism to fetch access tokens. Note that access tokens are time limited, you will need to manually refresh the tokens created by the

See Also

https://cloud.google.com/docs/authentication for more information on authentication in GCP.

Parameters
Name Description
access_token

the access token to be used by the client library.

expiration

the expiration time for the token.

opts

optional configuration values. Note that the effect of these parameters depends on the underlying transport. For example, TracingComponentsOption is ignored by gRPC-based services.

Returns
Type Description
std::shared_ptr< Credentials >

MakeImpersonateServiceAccountCredentials(std::shared_ptr< Credentials >, std::string, Options)

Creates credentials for service account impersonation.

Service account impersonation allows one account (user or service account) to act as a second account. This can be useful in multi-tenant services, where the service may perform some actions with an specific account associated with a tenant. The tenant can grant or restrict permissions to this tenant account.

When using service account impersonation is important to distinguish between the credentials used to obtain the target account credentials (the base_credentials) parameter, and the credentials representing the target_service_account.

Use AccessTokenLifetimeOption to configure the maximum lifetime of the obtained credentials. The default is 1h (3600s), see IAM quotas for the limits set by the platform and how to override them.

Use DelegatesOption to configure a sequence of intermediate service account, each of which has permissions to impersonate the next and the last one has permissions to impersonate target_service_account.

Use ScopesOption to restrict the authentication scope for the obtained credentials. See below for possible values.

See Also

https://cloud.google.com/docs/authentication for more information on authentication in GCP.

See Also

https://cloud.google.com/iam/docs/impersonating-service-accounts for information on managing service account impersonation.

See Also

https://developers.google.com/identity/protocols/oauth2/scopes for authentication scopes in Google Cloud Platform.

Parameters
Name Description
base_credentials

the credentials used to contact the IAM Credentials services.

target_service_account

the email address of the service account to impersonate.

opts

optional configuration values. Note that the effect of these parameters depends on the underlying transport. For example, TracingComponentsOption is ignored by gRPC-based services.

Returns
Type Description
std::shared_ptr< Credentials >

MakeServiceAccountCredentials(std::string, Options)

Creates service account credentials from a service account key.

A service account is an account for an application or compute workload instead of an individual end user. The recommended practice is to use Google Default Credentials, which relies on the configuration of the Google Cloud system hosting your application (GCE, GKE, Cloud Run) to authenticate your workload or application. But sometimes you may need to create and download a service account key, for example, to use a service account when running your application on a system that is not part of Google Cloud.

Service account credentials are used in this latter case.

You can create multiple service account keys for a single service account. When you create a service account key, the key is returned as string, in the format described by aip/4112. This string contains an id for the service account, as well as the cryptographical materials (a RSA private key) required to authenticate the caller.

Therefore, services account keys should be treated as any other secret with security implications. Think of them as unencrypted passwords. Do not store them where unauthorized persons or programs may read them.

As stated above, most applications should probably use default credentials, maybe pointing them to a file with these contents. Using this function may be useful when the service account key is obtained from Cloud Secret Manager or a similar service.

Parameters
Name Description
json_object

the service account configuration as a JSON string. Typically applications read this from a file, or download the contents from something like Google's secret manager service.

opts

optional configuration values. Note that the effect of these parameters depends on the underlying transport. For example, TracingComponentsOption is ignored by gRPC-based services.

Returns
Type Description
std::shared_ptr< Credentials >

MakeExternalAccountCredentials(std::string, Options)

Creates credentials based on external accounts.

Workload Identity Federation can grant on-premises or multi-cloud workloads access to Google Cloud resources, without using a service account key. You can use identity federation with Amazon Web Services (AWS), or with any identity provider that supports OpenID Connect (OIDC), such as Microsoft Azure, or SAML 2.0.

See Also

https://cloud.google.com/docs/authentication for more information on authentication in GCP.

Parameters
Name Description
json_object

the external account configuration as a JSON string. Typically applications read this from a file, or download the contents from something like Google's secret manager service. The configuration file can be created using the create-cred-configgcloud subcommand.

opts

optional configuration values. Note that the effect of these parameters depends on the underlying transport. For example, TracingComponentsOption is ignored by gRPC-based services.

Returns
Type Description
std::shared_ptr< Credentials >

make_ready_future(T &&)

Create a future that is immediately ready.

Parameters
Name Description
t
typename T
Returns
Type Description
future< typename internal::make_ready_return< T >::type >

make_ready_future()

Create a future that is immediately ready.

Returns
Type Description
future< void >

MakeStatusFromRpcError(grpc::Status const &)

Creates a google::cloud::Status from a grpc::Status.

Parameter
Name Description
status
Returns
Type Description
google::cloud::Status

MakeStatusFromRpcError(grpc::StatusCode, std::string)

Creates a google::cloud::Status from a grpc::StatusCode and description.

Parameters
Name Description
code
what
Returns
Type Description
google::cloud::Status

MakeStatusFromRpcError(google::rpc::Status const &)

Creates a google::cloud::Status from a google:rpc::Status proto.

Some gRPC services return the google::rpc::Status proto for errors. The libraries in google-cloud-cpp represent these errors using a google::cloud::Status.

Parameter
Name Description
proto
Returns
Type Description
google::cloud::Status

MakeKmsKeyName(std::string const &)

Constructs a KmsKeyName from the given full_name.

Returns a non-OK Status if full_name is improperly formed.

Parameter
Name Description
full_name
Returns
Type Description
StatusOr< KmsKeyName >

MakeLocation(std::string const &)

Constructs a Location from the given full_name.

Returns a non-OK Status if full_name is improperly formed.

Parameter
Name Description
full_name
Returns
Type Description
StatusOr< Location >

ParseSeverity(std::string const &)

Convert a human-readable representation to a Severity.

Parameter
Name Description
name
Returns
Type Description
absl::optional< Severity >

MakeProject(std::string const &)

Constructs a Project from the given full_name.

Returns a non-OK Status if full_name is improperly formed.

Parameter
Name Description
full_name
Returns
Type Description
StatusOr< Project >

StatusCodeToString(StatusCode)

Convert code to a human readable string.

Parameter
Name Description
code
Returns
Type Description
std::string

make_status_or(T)

Parameters
Name Description
rhs
typename T
Returns
Type Description
StatusOr< T >

SetTerminateHandler(TerminateHandler)

Install terminate handler and get the old one atomically.

Parameter
Name Description
f

the handler. It should never return, behaviour is undefined otherwise.

Returns
Type Description
TerminateHandler

Previously set handler.

GetTerminateHandler()

Get the currently installed handler.

Returns
Type Description
TerminateHandler

The currently installed handler.

Terminate(char const *)

Invoke the currently installed handler.

This function should never return.

Parameter
Name Description
msg

Details about the error.

Returns
Type Description
void

version_major()

The Google Cloud C++ Client major version.

Returns
Type Description
int constexpr

version_minor()

The Google Cloud C++ Client minor version.

Returns
Type Description
int constexpr

version_patch()

The Google Cloud C++ Client patch version.

Returns
Type Description
int constexpr

version_pre_release()

The Google Cloud C++ Client pre-release version.

Returns
Type Description
constexpr char const *

version()

A single integer representing the Major/Minor/Patch version.

Returns
Type Description
int constexpr

version_string()

The version as a string, in MAJOR.MINOR.PATCH[-PRE][+gitrev] format.

Returns
Type Description
std::string

Type Aliases

CommonOptionList

Alias Of: OptionList< EndpointOption, UserAgentProductsOption, TracingComponentsOption, UserProjectOption, AuthorityOption >

A list of all the common options.

BackoffPolicy

Alias Of: ::google::cloud::internal::BackoffPolicy

The base class for backoff policies.

ExponentialBackoffPolicy

Alias Of: google::cloud::internal::ExponentialBackoffPolicy

A truncated exponential backoff policy with randomized periods.

UnifiedCredentialsOptionList

Alias Of: OptionList< AccessTokenLifetimeOption, CARootsFilePathOption, DelegatesOption, ScopesOption, TracingComponentsOption, UnifiedCredentialsOption >

A list of options related to authentication.

BackgroundThreadsFactory

Alias Of: std::function< std::unique_ptr< BackgroundThreads >()>

GrpcOptionList

Alias Of: OptionList< GrpcCredentialOption, GrpcNumChannelsOption, GrpcChannelArgumentsOption, GrpcChannelArgumentsNativeOption, GrpcTracingOptionsOption, GrpcBackgroundThreadPoolSizeOption, GrpcCompletionQueueOption, GrpcBackgroundThreadsFactoryOption >

A list of all the gRPC options.

IamUpdater

Alias Of: std::function< absl::optional< google::iam::v1::Policy >(google::iam::v1::Policy)>

Used in the SetIamPolicy() read-modify-write cycles where an etag helps prevent simultaneous updates of a policy from overwriting each other.

The updater is called with a recently fetched policy, and should either return an empty optional if no changes are required, or return a new policy to be set. In the latter case the updater should either (1) set the etag of the returned policy to that of the recently fetched policy (strongly suggested), or (2) not set the etag at all.

In case (1) if the etag does not match the existing policy (i.e., there has been an intermediate update), this update is dropped and a new cycle is initiated. In case (2) the existing policy is overwritten blindly.

optional

Alias Of: absl::optional< T >

Alias template for google::cloud::optional.

OptionList

Alias Of: internal::TypeList< T... >

A template to hold a list of "option" types.

This can be a useful way to create meaningful lists of options. For example, there could be a list containing all the gRPC options. Or a list of all ProductX options. This gives us a way to link to lists of options with doxygen, and to do some checking about what options a function may expect.

RestOptionList

Alias Of: ::google::cloud::OptionList< QuotaUserOption, RestTracingOptionsOption, ServerTimeoutOption, UserIpOption >

The complete list of options accepted by CurlRestClient

TerminateHandler

Alias Of: std::function< void(char const *msg)>

Terminate handler.

It should handle the error, whose description are given in msg and should never return.