Rust 初识及Rust的ESApi

Rust

Rust是一门系统编程语言 ，专注于安全 ，尤其是并发安全，支持函数式和命令式以及泛型等编程范式的多范式语言。Rust在语法上和C++类似 ，但是设计者想要在保证性能的同时提供更好的内存安全。

Rust致力于成为优雅解决高并发和高安全性系统问题的编程语言 [10] ，适用于大型场景，即创造维护能够保持大型系统完整的边界。这就导致了它强调安全，内存布局控制和并发的特点。

安装

curl https://sh.rustup.rs -sSf | sh

安装完成后，开始在idea 中配置rust 环境（后来发现cLion 编译器对 rust 支持更好，支持api智能提示）


然后新建rust 项目

概念特性

关于rust 的特性和概念，我也是初始。其中“所有权”概念和“生命周期”概念比较独特，可以多关心一下。
下面是一些我觉得比较好的文档 记录一下：
通过例子学 Rust
官方文档
github 指南
官网入口
仓库，类似maven的 mvnrepository 里面各种包的文档很详细

以及我自己的一些些小小笔记

Es

最后贴上用rust 操作es的小 demo

use elasticsearch::{auth::Credentials, Elasticsearch, Error, SearchParts, CreateParts};
use url::Url;
use serde_json::{json, Value};

use elasticsearch::http::Method;
use elasticsearch::http::headers::HeaderMap;

///！默认链接
pub async fn get_client() -> Result<(), Box> {
    let client = Elasticsearch::default();
    let body = b"{\"query\":{\"match_all\":{}}}";
    let response = client
        .send(
            Method::Post,
            SearchParts::IndexType(&["user_index"], &["user"]).url().as_ref(),
            HeaderMap::new(),
            Option::<&Value>::None,
            Some(body.as_ref()),
        )
        .await?;
    let response_body = response.json::().await?;
    let took = response_body["took"].as_i64().unwrap();
    for hit in response_body["hits"]["hits"].as_array().unwrap() {
        println!("{:?}", hit["_source"]);
    }
    Ok(())
}


use elasticsearch::http::transport::{SingleNodeConnectionPool, TransportBuilder};

///！包含验证信息的客户端链接
pub async fn get_client_credentials() -> Result<(), Box> {
    let url = Url::parse("http://localhost:9200")?;
    let conn_pool = SingleNodeConnectionPool::new(url);
    let credentials = Credentials::Basic("".into(), "".into());
    let transport = TransportBuilder::new(conn_pool).auth(credentials).build()?;
    let client = Elasticsearch::new(transport);

    let response = client
        .search(SearchParts::IndexType(&["user_index"], &["user"]))
        .from(0)
        .size(10)
        .body(json!({
         "query": {
             "match_all": {
             }
         }
     }))
        .send()
        .await?;

    let response_body = response.json::().await?;
    let took = response_body["took"].as_i64().unwrap();
    for hit in response_body["hits"]["hits"].as_array().unwrap() {
        // print the source document
        println!("{:?}", hit["_source"]);
    }
    Ok(())
}


///!保存数据
pub async fn put_data() -> Result<(), Box> {
    let url = Url::parse("http://localhost:9200")?;
    let conn_pool = SingleNodeConnectionPool::new(url);
    let credentials = Credentials::Basic("".into(), "".into());
    let transport = TransportBuilder::new(conn_pool).auth(credentials).build()?;
    let client = Elasticsearch::new(transport);
    let response = client.create(CreateParts::IndexTypeId("user_index", "user", "100001"))
        .body(json!(
    {
	"id": "100001",
	"user_name": "yang",
	"mobile": "15683799234",
	"birth": "1999-06-15",
	"gender": "1",
	"age": "26",
	"height": "175",
	"weight": "65",
	"update_time": "2020-02-02 20:20:20"

}
    )).send().await?;
    let successful = response.status_code().is_success();
    Ok(())
}

///!批量保存
pub async fn batch_save_portrait(maps: Vec>) -> Result<(), Box> {
    println!("{},{}", "批量保存画像", maps.len());
    let mut bodys: Vec> = Vec::with_capacity(11000);
    for map in maps {
    	//保存到es 的 id，必须得传
        bodys.push(json!({"index": {"_id": map.get("user_id")}}).into());
        //map 为键值对 转化为 jsonBody
        bodys.push(JsonBody::from(Value::Object(map)).into());
    }
    let client = establish_connection();
    let response = client.client
        .bulk(BulkParts::IndexType("user_index_v1", "user"))
        .body(bodys)
        .send().await?;
    let successful = response.status_code().is_success();
    println!("successful----->{}", successful);
    Ok(())
}

所有调用 async 方法的方法 都要用 async 修饰

启动类 main.rs

mod es_client_test;
mod fusion_portrait;
mod es_client;

#[tokio::main]
async fn main() -> Result<(), Box> {
    println!("Hello, world!");
    fusion_portrait::get_all_key().await;
    Ok(())
}

Cargo.toml 文件

[package]
name = "rust-one"
version = "0.1.0"
authors = ["[email protected]>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
#引用包
[dependencies]
elasticsearch = "7.7.0-alpha.1"
serde = "~1"
serde_json = "~1"
url = "2.1.1"
tokio = "0.2.20"
dgraph-tonic = "0.5.0"
threadpool = "1.8.0"
rayon = "1.3.0"