Module server 

Structs

CapturingLogSink

Test-only HostLogSink that captures every emitted message in a Mutex<Vec<String>>. Tests inspect the captured messages to verify log bounds, content, and deduplication without touching stderr.

InvokeError

Typed invoke error.

RuntimeEngine

StderrLogSink

Default HostLogSink writing to stderr via eprintln!.

Enums

EngineResponse

Internal response type produced by RuntimeEngine. The IPC layer converts this to a v1 RuntimeResponse or v2 RuntimeResponseV2 based on the request’s api_version.

InvokeErrorKind

Stable categorisation of invoke failures.

Constants

MAX_DETAIL_BYTES

Maximum byte length of the host-only detail string. Guests can fully control this payload via the WIT handler-error variant, so the host truncates it to bound memory and stderr noise. The limit is enforced on a UTF-8 char boundary so the stored string stays valid.

Traits

HostLogSink

Minimal host-side log sink for invoke diagnostics.

InvokeHandler

Consumers can implement this trait to add business-specific invocation logic.