Crate switchback_protocols 

Built-in protocol implementations and registry for switchback attachments.

Transport semantics are orthogonal to contract family. Parsers attach ProtocolAttachment envelopes on contract and entity nodes; this crate provides HttpProtocol, GrpcProtocol, and ProtocolRegistry to encode and decode built-in payload schemas.

Entity attachment matrix

IR node	http payload arm	grpc payload arm
Contract	HttpContractMeta	GrpcContractMeta
Operation	HttpOperationMeta	GrpcOperationMeta
Response ref/body	HttpResponseMeta / HttpErrorMeta	GrpcStatusMeta / GrpcErrorMeta
Parameter ref/body	HttpParameterMeta	GrpcMetadataMeta

Decode: read protocol_id, deserialize payload as HttpPayload or GrpcPayload, inspect the oneof kind. See ADR 0011 and ADR 0012.

Structs

AmqpProtocol

Built-in AMQP protocol ("amqp").

GrpcProtocol

Built-in gRPC protocol ("grpc").

HttpProtocol

Built-in HTTP protocol ("http").

KafkaProtocol

Built-in Kafka protocol ("kafka").

MqttProtocol

Built-in MQTT protocol ("mqtt").

ProtocolRegistry

Registry of built-in protocol decoders.

Enums

AmqpPayloadKind

Decoded AMQP payload oneof arm.

DecodedAttachment

Result of decoding a ProtocolAttachment.

GrpcPayloadKind

Decoded gRPC payload oneof arm.

HttpPayloadKind

Decoded HTTP payload oneof arm.

KafkaPayloadKind

Decoded Kafka payload oneof arm.

MqttPayloadKind

Decoded MQTT payload oneof arm.

Traits

ErrorProtocol

Error / fault documentation aspects.

FieldCarrierProtocol

Named fields carried outside the message body.

OperationProtocol

Operation documentation aspects.

Protocol

Stable protocol slug plus metadata.

ProtocolWire

Encode/decode the typed payload inside ProtocolAttachment.

ResponseProtocol

Response outcome mapping.

Functions

grpc_status_name_severity

Classify a gRPC status name (OK, INVALID_ARGUMENT, …).

grpc_status_severity

Classify a gRPC status code (numeric google.rpc.Code).

http_status_code_severity

Classify a numeric HTTP status code.

http_status_severity

Classify an OpenAPI / HTTP status key (200, 4XX, default, …).