syntax = "proto3";

package codemp.buffer;

// handle buffer changes, keep in sync users
service Buffer {
	// attach to a buffer and receive operations
	rpc Attach (BufferPayload)    returns (stream RawOp);
	// send an operation for a specific buffer
	rpc Edit   (OperationRequest) returns (BufferEditResponse);
	// create a new buffer
	rpc Create (BufferPayload)    returns (BufferCreateResponse);
	// get contents of buffer
	rpc Sync   (BufferPayload)    returns (BufferResponse);
}

// empty request
message BufferCreateResponse {}

// empty request
message BufferEditResponse {}

// raw wire operation sequence event
message RawOp {
	// operation seq serialized to json
	string opseq = 1;

	// user id that has executed the operation
	string user = 2;
}

// client buffer operation request
message OperationRequest {
	// buffer path to operate onto
	string path  = 1;

	// buffer hash of source state
	string hash  = 2;

	// raw operation sequence
	RawOp op = 3;
}

// generic buffer operation request
message BufferPayload {
	// buffer path to operate onto
	string path = 1;

	// user id that is requesting the operation
	string user = 2;

	// optional buffer full content for replacing
	optional string content = 3;
}

// response from server with buffer content
message BufferResponse {
	// current buffer content
	string content = 1;
}