Programmatic equivalent to AWS_REQUEST_CHECKSUM_CALCULATION=WHEN_REQUIRED

[hniksic]

We need to configure AWS to use AWS_REQUEST_CHECKSUM_CALCULATION=WHEN_REQUIRED. AWS storage is (optionally) used by a library, which is an implementation detail, so we'd like to avoid requiring everyone who run binaries that use the library to change their environment. For that reason we currently use:

std::env::set_var("AWS_REQUEST_CHECKSUM_CALCULATION", "WHEN_REQUIRED");
std::env::set_var("AWS_RESPONSE_CHECKSUM_CALCULATION", "WHEN_REQUIRED");

but that is error-prone, affects the whole process, and will become unsafe in the next Rust edition.

Is there a way to do it programmatically? For example, something like request_checksum_calculation in Python's botocore.config.Config.

[landonxjames]

This is available on the SdkConfig via the request_checksum_calculation and the response_checksum_validation settings.

[hniksic]

How do I affect these settings, though? The functions you linked only appear to query them, not modify them.

[landonxjames]

Ah sorry, linked to the wrong ones, you do it with the same methods on the Builder for the SdkConfig: https://docs.rs/aws-types/1.3.5/aws_types/sdk_config/struct.Builder.html#method.request_checksum_calculation

[hniksic]

Thanks. I think I missed these because I was looing at aws_config::ConfigLoader, which we are currently using. Is it possible to configure these settings using the ConfigLoader? The docs for aws_types::sdk_config::Builder say:

Important: Using the aws-config crate to configure the SDK is preferred to invoking this builder directly. Using this builder directly won’t pull in any AWS recommended default configuration values.