// SPDX-License-Identifier: Apache-2.0

syntax = "proto3";

package process;

service Process {
    rpc List(ListRequest) returns (ListResponse);

    rpc Connect(ConnectRequest) returns (stream ConnectResponse);
    rpc Start(StartRequest) returns (stream StartResponse);

    rpc Update(UpdateRequest) returns (UpdateResponse);

    // Client input stream ensures ordering of messages
    rpc StreamInput(stream StreamInputRequest) returns (StreamInputResponse);
    rpc SendInput(SendInputRequest) returns (SendInputResponse);
    rpc SendSignal(SendSignalRequest) returns (SendSignalResponse);

    // Close stdin to signal EOF to the process.
    // Only works for non-PTY processes. For PTY, send Ctrl+D (0x04) instead.
    rpc CloseStdin(CloseStdinRequest) returns (CloseStdinResponse);
}

message PTY {
    Size size = 1;

    message Size {
        uint32 cols = 1;
        uint32 rows = 2;
    }
}

message ProcessConfig {
    string cmd = 1;
    repeated string args = 2;

    map<string, string> envs = 3;
    optional string cwd = 4;
}

message ListRequest {}

message ProcessInfo {
    ProcessConfig config = 1;
    uint32 pid = 2;
    optional string tag = 3;
}

message ListResponse {
    repeated ProcessInfo processes = 1;
}

message StartRequest {
    ProcessConfig process = 1;
    optional PTY pty = 2;
    optional string tag = 3;
    // This is optional for backwards compatibility.
    // We default to true. New SDK versions will set this to false by default.
    optional bool stdin = 4;
}

message UpdateRequest {
    ProcessSelector process = 1;

    optional PTY pty = 2;
}

message UpdateResponse {}

message ProcessEvent {
    oneof event {
        StartEvent start = 1;
        DataEvent data = 2;
        EndEvent end = 3;
        KeepAlive keepalive = 4;
    }

    message StartEvent {
        uint32 pid = 1;
    }

    message DataEvent {
        oneof output {
            bytes stdout = 1;
            bytes stderr = 2;
            bytes pty = 3;
        }
    }

    message EndEvent {
        sint32 exit_code = 1;
        bool exited = 2;
        string status = 3;
        optional string error = 4;
    }

    message KeepAlive {}
}

message StartResponse {
    ProcessEvent event = 1;
}

message ConnectResponse {
    ProcessEvent event = 1;
}

message SendInputRequest {
    ProcessSelector process = 1;

    ProcessInput input = 2;
}

message SendInputResponse {}

message ProcessInput {
    oneof input {
        bytes stdin = 1;
        bytes pty = 2;
    }
}

message StreamInputRequest {
    oneof event {
        StartEvent start = 1;
        DataEvent data = 2;
        KeepAlive keepalive = 3;
    }

    message StartEvent {
        ProcessSelector process = 1;
    }

    message DataEvent {
        ProcessInput input = 2;
    }

    message KeepAlive {}
}

message StreamInputResponse {}

enum Signal {
    SIGNAL_UNSPECIFIED = 0;
    SIGNAL_SIGTERM = 15;
    SIGNAL_SIGKILL = 9;
}

message SendSignalRequest {
    ProcessSelector process = 1;

    Signal signal = 2;
}

message SendSignalResponse {}

message CloseStdinRequest {
    ProcessSelector process = 1;
}

message CloseStdinResponse {}

message ConnectRequest {
    ProcessSelector process = 1;
}

message ProcessSelector {
    oneof selector {
        uint32 pid = 1;
        string tag = 2;
    }
}