wasi-module-sdk-go/api/README.md

WASI host - module data exchange

The module SDK re-uses a subset of protobuf messages also used in the remote protocol except for the TaskOutput message because WASI handles STDOUT/STDERR already.

The protobuf messages are not used with gRPC but only as binary encoded messages shared via pointers in the WASI modules memory.

The following 'RPC' calls are supported:

• log_msg accepting a pointer and an offset to a TaskLog message - won't return anything
• get_state accepting a pointer and an offset to a GetStateRequest message, returning a 64-bit integer (32-bit pointer, 32-bit size) to a GetStateResponse message
• set_state accepting a pointer and an offset to a SetState message, returning a 64-bit integer (32-bit pointer, 32-bit size) to a Result message optionally containing error details