package com.primeton.dsp.datarelease.data.bdata;



import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.apache.hadoop.conf.Configuration;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.List;
import java.util.Properties;




/**
 * <pre>
 *
 * Created by zhaopx.
 * User: zhaopx
 * Date: 2020/4/20
 * Time: 17:56
 *
 * </pre>
 *
 * @author zhaopx merge
 */
@Slf4j
public class HiveHelper {
    private static final String ZOOKEEPER_DEFAULT_LOGIN_CONTEXT_NAME = "Client";
    private static final String ZOOKEEPER_SERVER_PRINCIPAL_KEY = "zookeeper.server.principal";
    private static final String ZOOKEEPER_DEFAULT_SERVER_PRINCIPAL = "zookeeper/hadoop";

    private String hiveclientPropFile = null;
    private String krb5File = null;
    private String userName = null;
    private String userKeytabFile = null;

    private String url = null;

    private String zkQuorum = null;// zookeeper节点ip和端口列表
    private String auth = null;
    private String sasl_qop = null;
    private String zooKeeperNamespace = null;
    private String serviceDiscoveryMode = null;
    private String principal = null;

    private Deque<Connection> pools = new ArrayDeque<Connection>();
    private List<Connection> allConnection = new ArrayList<Connection>();


    private final Configuration conf;

    public HiveHelper(@NonNull Configuration conf,
                      @NonNull String hiveclientPropFile,
                      String userName,
                      String userKeytabFile,
                      String krb5File) throws IOException {
        this.conf = conf;
        this.hiveclientPropFile = hiveclientPropFile;
        this.userName = userName;
        this.userKeytabFile = userKeytabFile;
        this.krb5File = krb5File;

        this.init();
    }

    private void init() throws IOException {
        Properties clientInfo = null;
        InputStream fileInputStream = null;
        try {
            clientInfo = new Properties();
            // "hiveclient.properties"为客户端配置文件，如果使用多实例特性，需要把该文件换成对应实例客户端下的"hiveclient.properties"
            // "hiveclient.properties"文件位置在对应实例客户端安裝包解压目录下的config目录下
            File propertiesFile = new File(this.hiveclientPropFile);
            fileInputStream = new FileInputStream(propertiesFile);
            clientInfo.load(fileInputStream);
        } catch (Exception e) {
            throw new IOException(e);
        } finally {
            if (fileInputStream != null) {
                fileInputStream.close();
                fileInputStream = null;
            }
        }
        // zkQuorum获取后的格式为"xxx.xxx.xxx.xxx:24002,xxx.xxx.xxx.xxx:24002,xxx.xxx.xxx.xxx:24002";
        // "xxx.xxx.xxx.xxx"为集群中ZooKeeper所在节点的业务IP，端口默认是24002
        zkQuorum = clientInfo.getProperty("zk.quorum");
        auth = clientInfo.getProperty("auth");
        sasl_qop = clientInfo.getProperty("sasl.qop");
        zooKeeperNamespace = clientInfo.getProperty("zooKeeperNamespace");
        serviceDiscoveryMode = clientInfo.getProperty("serviceDiscoveryMode");
        principal = clientInfo.getProperty("principal");

        // 拼接JDBC URL
        StringBuilder sBuilder = new StringBuilder("jdbc:hive2://").append(zkQuorum).append("/");
        if ("KERBEROS".equalsIgnoreCase(auth)) {
            // 设置客户端的keytab和krb5文件路径

            LoginUtil.setJaasConf(ZOOKEEPER_DEFAULT_LOGIN_CONTEXT_NAME, this.userName, this.userKeytabFile);
            LoginUtil.setZookeeperServerPrincipal(ZOOKEEPER_SERVER_PRINCIPAL_KEY, ZOOKEEPER_DEFAULT_SERVER_PRINCIPAL);

            // 安全模式
            this.conf.set("hadoop.security.authentication", "kerberos");
            // Zookeeper登录认证
            LoginUtil.login(this.userName, this.userKeytabFile, this.krb5File, this.conf);

            sBuilder.append(";serviceDiscoveryMode=").append(serviceDiscoveryMode).append(";zooKeeperNamespace=")
                    .append(zooKeeperNamespace).append(";sasl.qop=").append(sasl_qop).append(";auth=").append(auth)
                    .append(";principal=").append(principal).append(";");
        } else {
            // 普通模式
            sBuilder.append(";serviceDiscoveryMode=").append(serviceDiscoveryMode).append(";zooKeeperNamespace=")
                    .append(zooKeeperNamespace).append(";auth=none");
        }

        this.url = sBuilder.toString();
    }

    public Connection getConnection() throws SQLException {
        return DriverManager.getConnection(url, "", "");
    }

    public synchronized Connection getPoolConnection() throws SQLException{
        if(!pools.isEmpty()) {
            return pools.removeLast();
        }

        Connection conn = getConnection();
        allConnection.add(conn);

        return conn;
    }

    public synchronized void returnConnection(Connection conn) {
        pools.addFirst(conn);
    }

    public synchronized void closePoolConnection() {
        for(Connection conn : allConnection) {
            close(conn);
        }
    }

    public static void close(Connection conn) {
        if(conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                log.error("关闭Hive连接失败.", e);
            }
        }
    }

    public static void close(Statement statment, ResultSet rs) {
        if(rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {}
        }

        if(statment != null) {
            try {
                statment.close();
            } catch (SQLException e) {}
        }
    }

}