API.proto

// Instruction transfer API description
// Used to generate python gRPC classes

syntax = "proto3";

import "google/protobuf/timestamp.proto";

// Important line for Java compatibility
// Will get "Not implemented" without it
package virtual_assistant;

// Empty message as rpc requires to have input
message AllInstructioinsRequest {}

message Timestamp
{
    google.protobuf.Timestamp timestamp = 1;
}

// Instruction Thumbnail metadata and image as byte array
message InstructionThumbnail
{
    string id = 1;
    string name = 2;
    int32 size = 3;
    string description = 4;
    bytes image = 5;
    Timestamp last_modified = 6;
    int32 step_count = 7;
    /* more metadata */
}

// Array of instruction thumbnails
message AllInstructioinsResponse
{
    repeated InstructionThumbnail thumbnails = 1;
}

message InstructionRequest
{
    string id = 1;
}

// Array of Steps
message InstructionResponse
{
    int32 status = 1;
    repeated Step steps = 2;
}

// 3D Pose and scale
message Transform
{
    message Vector3
    {
        float x = 1;
        float y = 2;
        float z = 3;
    }

    Vector3 position = 1;
    Vector3 orientation = 2;
    float scale = 3;
}

message Media
{
    enum MediaType
    {
        IMAGE = 0; //default not default? no default?
        AUDIO = 1;
        VIDEO = 2;
        MODEL = 3;
        TEXT = 4;
    }

    MediaType type = 1;
    string url = 2;
    string description = 3;
}

// Kind of object is determined by enum MediaType
message Asset
{
    Media media = 1;
    Transform transform = 2;
    bool hidden = 3;
}

// One step might containt multiple Assets
message Step
{
    string name = 1;
    string description = 2;
    string preview_url = 3;
    repeated Asset assets = 4;
}

// Chunks for big files requests
message Chunk
{
    bytes buffer = 1;
}

// Status to indicate if data was received or not
message Status
{
    int32 status = 1;
}

message MediaRequest
{
    string id = 1;
}

service VirtualAssistant
{
    // Request thumbnails to all available instructions
    rpc GetAllInstructions(AllInstructioinsRequest) returns (AllInstructioinsResponse) {}
    // Request instruction by id
    rpc GetInstruction(InstructionRequest) returns (InstructionResponse) {}
    // Request media folder in zip format
    rpc DownloadMedia(MediaRequest) returns (stream Chunk) {}
    // Upload instruction(s) from web-editor
    rpc UploadInstructions(stream Chunk) returns (Status) {}
    // Check when the object was modified last time
    rpc LastModified(InstructionRequest) returns (Timestamp) {}
}