// Copyright 2019 Cargill Incorporated
//
// 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.
// -----------------------------------------------------------------------------

syntax = "proto3";

// A transaction payload for the Command Family
message CommandPayload {
    // The list of commands to execute
    repeated Command commands = 1;
}

// A key-value pair where the value is a bytes field.
message BytesEntry {
    // The key, for instance a state address or a string value, depending on
    // the target of the entry.
    string key = 1;
    // The byte value to be stored
    bytes value = 2;
}

// The list of state keys to be retrieved via a GET_STATE command.
message GetState {
    // a non-empty list of valid state keys
    repeated string state_keys = 1;
}

// The list of state entries to be set via a SET_STATE command.
message SetState {
    // a non-empty list of BytesEntry instances, where the key field is a
    // valid state key.
    repeated BytesEntry state_writes = 1;
}

// The list of state keys to be deleted via a DELETE_STATE command.
message DeleteState {
    // a non-empty list of valid state keys
    repeated string state_keys = 1;
}

// Describes an event to add to the receipt via an ADD_EVENT command.
message AddEvent {
    // The event type
    string event_type = 1;
    // The attribute entries
    repeated BytesEntry attributes = 2;
    // Arbitrary opaque event data
    bytes data = 3;
}

// The opaque byte data to add to the receipt via an ADD_RECEIPT_DATA
// command.
message AddReceiptData {
    // a non-empty byte array
    bytes receipt_data = 1;
}

// The duration and method of sleep to apply during a SLEEP command.
message Sleep {
    enum SleepType {
        // This will wait, releasing cpu utilization to other processes
        WAIT = 0;
        // This will consume a cpu core for the specified time
        BUSY_WAIT = 1;
    }

    // The duration to sleep, in milliseconds
    uint32 duration_millis = 1;
    SleepType sleep_type = 2;
}

// The details to return on an RETURN_INVALID command.
message ReturnInvalid {
    // An optional error message
    string error_message = 1;
}

// The details to return on an RETURN_INTERNAL_ERROR command.
message ReturnInternalError {
    // An optional error message
    string error_message = 1;
}

// A command to be executed
message Command {
    enum CommandType {
        UNSET_COMMAND_TYPE = 0;
        GET_STATE = 1;
        SET_STATE = 2;
        DELETE_STATE = 3;
        ADD_EVENT = 4;
        ADD_RECEIPT_DATA = 5;
        SLEEP = 6;
        RETURN_INVALID = 7;
        RETURN_INTERNAL_ERROR = 8;
    }

    // The type of the command, which indicates which of the following
    // fields will be set.
    CommandType command_type = 1;

    GetState get_state = 2;
    SetState set_state = 3;
    DeleteState delete_state = 4;
    AddEvent add_event = 5;
    AddReceiptData add_receipt_data = 6;
    Sleep sleep = 7;
    ReturnInvalid return_invalid = 8;
    ReturnInternalError return_internal_error = 9;
}