Ruko

A dead-simple in-memory database

Ruko is a dead simple in memory database where json is a first class citezen.

The Python client library has more background and details on the protocol.

Usage

#include <Ruko.hpp>

RukoDb db;

void getNotes() {
    return db.get({"notes"}).toString();
}

void addNote(const std::string &title, const std::string &content) {
    static int noteId = 0;
    db.lput({"notes"}, Object::parse::(R"({"id": ")" + std::to_string(++nodeId) + R"(", "title": ")" + title + R"(", "content": ")", + content + R"("})"));
}

void getNote(const std::string &id) {
    return db.get({"notes", "id:" + id});
}

Compiling

To compile, you need a c++14 compiler and cmake:

mkdir build && cd build
cmake ..
make -j4  # Use number of cores
sudo make install  # Installs ruko-server binary into /usr/local/bin

Development

Warning: Here be dragons. Thou hast been warned.

The project is layed out roughly as follows:

• RukoServer listens on a websocket for clients
• It also contains a RukoDb object that represents the database
• Messages get serialized into Commands and handled by RukoDb methods
• RukoDb has two main objects: a db: Object object and an indices: IndexManager object
  • IndexManager maintains a subtree of the db data structure whose leaves/nodes contain precalculated indices for any dictionary/list whose values have been queried by an attribute lookup operation (ie. GET users.email:abc@d.com creates an index for users.* that tracks the email key).
  • Object is just a JSON class that represents data and can be serialized/parsed both in binary form (ie. for parsing from commands / disk) or in JSON form (ie. for exporting data or creating from a string for tests)