waSCC图Actor API

此crate为waSCC actors提供API，使它们能够与图数据库交互。使用此API的actor开发者对图数据库的特定实现（Neo4j、RedisGraph等）无关紧要。

以下示例展示了如何消费图客API

// Execute a Cypher query to add data
fn create_data() -> HandlerResult<codec::http::Response> {
    info!("Creating graph data");
    graph::default().graph("MotoGP").mutate("CREATE (:Rider {name: 'Valentino Rossi', birth_year: 1979})-[:rides]->(:Team {name: 'Yamaha'}), \
    (:Rider {name:'Dani Pedrosa', birth_year: 1985, height: 1.58})-[:rides]->(:Team {name: 'Honda'}), \
    (:Rider {name:'Andrea Dovizioso', birth_year: 1986, height: 1.67})-[:rides]->(:Team {name: 'Ducati'})")?;

    Ok(codec::http::Response::ok())
}

// Execute a Cypher query to return data values
fn query_data() -> HandlerResult<codec::http::Response> {
    info!("Querying graph data");
    let (name, birth_year): (String, u32) = graph::default().graph("MotoGP").query(
        "MATCH (r:Rider)-[:rides]->(t:Team) WHERE t.name = 'Yamaha' RETURN r.name, r.birth_year",
    )?;

    let result = json!({
        "name": name,
        "birth_year": birth_year
    });
    Ok(codec::http::Response::json(result, 200, "OK"))
}