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Using invocation context

Context is metadata associated with each invocation. If the handler function accepts a context argument then it will automatically receive at runtime a named list consisting of these values along with the arguments in the body (if any). For example, a function such as my_func(x, context) will receive the context argument automatically. The context argument must be named (... will not work).

The following context is made available as a named list:

aws_request_id - The identifier of the invocation request
invoked_function_arn – The Amazon Resource Name (ARN) that’s used to invoke the function. Indicates if the invoker specified a version number or alias.
function_name
function_version
memory_limit_in_mb
log_group_name
log_stream_name

Event class-specific context

This section concerns future functionality for the lambdr package. It is not yet implemented.

A particular event class (determined by invocation method) can implement an extract_context method. This could be used to say, include details about the HTTP request if an invocation is coming via an API Gateway.

In all cases the context should be a named list. The new context is appended to the default values listed above.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.