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syntax = "proto3";

package xyz.block.ftl.v1;

import "xyz/block/ftl/v1/ftl.proto";
import "xyz/block/ftl/v1/schema/schema.proto";

option go_package = "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1;ftlv1";
option java_multiple_files = true;

message CallRequest {
  Metadata metadata = 1;

  schema.Ref verb = 2;
  bytes body = 3;
}

message CallResponse {
  message Error {
    string message = 1;
    optional string stack = 2;
    // TODO: Richer error type.
  }

  oneof response {
    bytes body = 1;
    Error error = 2;
  }
}

// VerbService is a common interface shared by multiple services for calling Verbs.
service VerbService {
  // Ping service for readiness.
  rpc Ping(PingRequest) returns (PingResponse) {
    option idempotency_level = NO_SIDE_EFFECTS;
  }

  // Issue a synchronous call to a Verb.
  rpc Call(CallRequest) returns (CallResponse);
}