Module executor 

Lambda function execution engine.

Converts the stubbed Invoke echo path into real execution by routing every request through an Executor trait. Backends include:

• NoopExecutor — preserves the legacy “echo back the payload” behavior; used in unit tests and when LAMBDA_EXECUTOR=disabled.
• AutoExecutor — defaults macOS Zip Lambdas to Squib and otherwise uses native execution.
• NativeExecutor (Phase 3) — spawns provided.* bootstraps directly on the host.
• DockerExecutor (Phase 4) — runs any supported runtime in an AWS Lambda base image.
• SquibExecutor — runs arm64 Zip functions through a Squib microVM guest agent.

All backends share a single in-process Lambda Runtime API server (Phase 2) so the bootstrap-side protocol is identical to AWS.

async-trait is required because RustackLambda stores the executor as Arc<dyn Executor> for backend swapping at startup; the trait must be object-safe.

Modules

runtime_api

In-process Lambda Runtime API server.

Structs

AutoExecutor

Executor that chooses the concrete backend for each invocation.

InvokeRequest

Everything an executor needs to run one invocation.

InvokeResponse

Outcome of a successful round-trip with the user code (which may itself have reported a function error).

NativeExecutor

Native process executor.

NoopExecutor

Echoes the request payload back wrapped in a fake API Gateway response shape — identical to the old hard-coded stub.

SquibExecutor

Lambda executor that delegates invocation to a Squib microVM guest agent.

SquibExecutorConfig

Configuration for SquibExecutor.

Enums

ExecutorBackend

Selects which execution backend the provider should construct at startup.

ExecutorError

Failure modes for an execution backend.

PackageType

Deployment package kind, mirroring the Lambda API.

Traits

Executor

Backend that turns an InvokeRequest into an InvokeResponse.