import lombok.Data;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@ConfigurationProperties(prefix = "elasticsearch")
@Configuration
@Data
public class ElasticsearchConfig {

    private String host;

    private Integer port;

    private String username;

    private String password;

    /**
     * 建立连接的最长等待时间
     */
    private Integer connectTimeout;

    /**
     * 从服务器读取数据的最长等待时间
     */
    private Integer socketTimeout;

    /**
     * 从连接池获取连接的超时时间
     */
    private Integer connectionRequestTimeout;

    @Bean(destroyMethod = "close")
    public RestHighLevelClient restHighLevelClient() {

        RestClientBuilder builder = RestClient.builder(new HttpHost(host, port));
        // 配置一些请求配置的参数
        builder.setRequestConfigCallback(requestConfigBuilder -> {
            requestConfigBuilder.setConnectTimeout(connectTimeout);
            requestConfigBuilder.setSocketTimeout(socketTimeout);
            requestConfigBuilder.setConnectionRequestTimeout(connectionRequestTimeout);
            return requestConfigBuilder;
        });

        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));

        // 配置一些httpClient的参数
        builder.setHttpClientConfigCallback(httpClientBuilder -> {
            // 设置keep-alive时间为3分钟
            httpClientBuilder.setKeepAliveStrategy((response, context) -> 3 * 60 * 1000);
            httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
            httpClientBuilder.setDefaultRequestConfig(RequestConfig.DEFAULT);
            // 对于同一个目标主机，最多可以同时建立100个连接，默认是10
            httpClientBuilder.setMaxConnPerRoute(100);
            // 无论有多少个目标主机，整个HTTP客户端实例最多只能同时建立100个连接，默认是30
            httpClientBuilder.setMaxConnTotal(100);
            return httpClientBuilder;
        });
        return new RestHighLevelClient(builder);
    }

}