Invocation context

Invocation context is an object that is optionally accepted by the request handler. The object type is context.Context. It provides an interface for getting more information about function version properties:

• lambdaRuntimeFunctionName: The function ID (string).
• lambdaRuntimeFunctionVersion: The function version ID (string).
• lambdaRuntimeMemoryLimit: The amount of memory specified when creating the function version, MB (int).
• lambdaRuntimeRequestID: The ID of the request being handled (string).

To extract information from the invocation context, use its Value(key) method and pass it in the key parameter as a string with one of the keys described above.

Authentication in the Yandex.Cloud API

If a function has a specified service account, you can use the SDK to obtain information that is necessary for authentication on behalf of this service account. To get this information, use the following methods:

creds := ycsdk.InstanceServiceAccount()
token, err := creds.IAMToken(ctx)

The token.IamToken field contains the required IAM token.
The code above works via the metadata service that is available in the function environment with the specified service account.