// Copyright 2016-2017, Pulumi Corporation
//
// 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";

import "google/protobuf/empty.proto";
import "google/protobuf/struct.proto";

package lumirpc;

// Engine is an interface into the core engine responsible for orchestrating resource operations.
service Engine {
    // Log logs a global message in the engine, including errors and warnings.
    rpc Log(LogRequest) returns (google.protobuf.Empty) {}
    // ReadLocation reads the value from a location identified by a token in the current program.
    rpc ReadLocation(ReadLocationRequest) returns (google.protobuf.Value) {}
}

// LogSeverity is the severity level of a log message.  Errors are fatal; all others are informational.
enum LogSeverity {
    DEBUG = 0;   // a debug-level message not displayed to end-users (the default).
    INFO = 1;    // an informational message printed to output during resource operations.
    WARNING = 2; // a warning to indicate that something went wrong.
    ERROR = 3;   // a fatal error indicating that the tool should stop processing subsequent resource operations.
}

message LogRequest {
    LogSeverity severity = 1; // the logging level of this message.
    string message = 2;       // the contents of the logged message.
}

message ReadLocationRequest {
    string token = 1; // the static or module variable whose value to read.
}