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// Copyright 2019 Lightbend Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// gRPC interface for Event Sourced Entity user functions.

syntax = "proto3";

package cloudstate.function;

// Any is used so that domain events defined according to the functions business domain can be embedded inside
// the protocol.
import "google/protobuf/any.proto";
import "cloudstate/entity.proto";

option java_package = "io.cloudstate.protocol";

message FunctionCommand {
    // The name of the service this function is on.
    string service_name = 2;

    // Command name
    string name = 3;

    // The command payload.
    google.protobuf.Any payload = 4;
}

message FunctionReply {

    oneof response {
        Reply reply = 2;
        Forward forward = 3;
    }

    repeated SideEffect side_effects = 4;
}

service StatelessFunction {

    rpc handleUnary(FunctionCommand) returns (FunctionReply) {}

    rpc handleStreamedIn(stream FunctionCommand) returns (FunctionReply) {}

    rpc handleStreamedOut(FunctionCommand) returns (stream FunctionReply) {}

    rpc handleStreamed(stream FunctionCommand) returns (stream FunctionReply) {}

}