TD-1174: jdbc without host ip

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConnection.java

@@ -14,6 +14,7 @@
  *****************************************************************************/
 package com.taosdata.jdbc;
 
+import java.io.*;
 import java.sql.Array;
 import java.sql.Blob;
 import java.sql.CallableStatement;
@@ -30,11 +31,11 @@ import java.sql.SQLXML;
 import java.sql.Savepoint;
 import java.sql.Statement;
 import java.sql.Struct;
-import java.util.Enumeration;
-import java.util.Map;
-import java.util.Properties;
+import java.util.*;
 import java.util.concurrent.Executor;
 
+import static com.sun.deploy.cache.Cache.exists;
+
 public class TSDBConnection implements Connection {
 
     private TSDBJNIConnector connector = null;
@@ -53,12 +54,67 @@ public class TSDBConnection implements Connection {
 
     public TSDBConnection(Properties info, TSDBDatabaseMetaData meta) throws SQLException {
         this.dbMetaData = meta;
+
+        //load taos.cfg start
+        File cfgDir = loadConfigDir(info.getProperty(TSDBDriver.PROPERTY_KEY_CONFIG_DIR));
+        File cfgFile = cfgDir.listFiles((dir, name) -> "taos.cfg".equalsIgnoreCase(name))[0];
+        List<String> endpoints = loadConfigEndpoints(cfgFile);
+        if (!endpoints.isEmpty()){
+            info.setProperty(TSDBDriver.PROPERTY_KEY_HOST,endpoints.get(0).split(":")[0]);
+            info.setProperty(TSDBDriver.PROPERTY_KEY_PORT,endpoints.get(0).split(":")[1]);
+        }
+        //load taos.cfg end
+
         connect(info.getProperty(TSDBDriver.PROPERTY_KEY_HOST),
                 Integer.parseInt(info.getProperty(TSDBDriver.PROPERTY_KEY_PORT, "0")),
                 info.getProperty(TSDBDriver.PROPERTY_KEY_DBNAME), info.getProperty(TSDBDriver.PROPERTY_KEY_USER),
                 info.getProperty(TSDBDriver.PROPERTY_KEY_PASSWORD));
     }
 
+    private List<String> loadConfigEndpoints(File cfgFile){
+        List<String> endpoints = new ArrayList<>();
+        try(BufferedReader reader = new BufferedReader(new FileReader(cfgFile))) {
+            String line = null;
+            while ((line = reader.readLine())!=null){
+                if (line.trim().startsWith("firstEp") || line.trim().startsWith("secondEp")){
+                    endpoints.add(line.substring(line.indexOf('p')+1).trim());
+                }
+                if (endpoints.size()>1)
+                    break;
+            }
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return endpoints;
+    }
+
+    /**
+     * @param cfgDirPath
+     * @return return the config dir
+     * **/
+    private File loadConfigDir(String cfgDirPath) {
+        if (cfgDirPath == null)
+            return loadDefaultConfigDir();
+        File cfgDir = new File(cfgDirPath);
+        if (!cfgDir.exists())
+            return loadDefaultConfigDir();
+        return cfgDir;
+    }
+
+    /**
+     * @return search the default config dir, if the config dir is not exist will return null
+     * */
+    private File loadDefaultConfigDir(){
+        File cfgDir;
+        File cfgDir_linux = new File("/etc/taos");
+        cfgDir = cfgDir_linux.exists() ? cfgDir_linux : null;
+        File cfgDir_windows = new File("C:\\TDengine\\cfg");
+        cfgDir = (cfgDir == null && cfgDir_windows.exists()) ? cfgDir_windows : cfgDir;
+        return cfgDir;
+    }
+
     private void connect(String host, int port, String dbName, String user, String password) throws SQLException {
         this.connector = new TSDBJNIConnector();
         this.connector.connect(host, port, dbName, user, password);
@@ -146,8 +202,7 @@ public class TSDBConnection implements Connection {
      * DatabaseMetaData object.
      *
      * @return a DatabaseMetaData object for this connection
-	 * @exception SQLException
-	 *                if a database access error occurs
+     * @throws SQLException if a database access error occurs
      */
     public DatabaseMetaData getMetaData() throws SQLException {
         return this.dbMetaData;
@@ -156,6 +211,7 @@ public class TSDBConnection implements Connection {
     /**
      * This readOnly option is not supported by TDengine. However, the method is intentionally left blank here to
      * support HikariCP connection.
+     *
      * @param readOnly
      * @throws SQLException
      */
@@ -177,6 +233,7 @@ public class TSDBConnection implements Connection {
     /**
      * The transaction isolation level option is not supported by TDengine.
      * This method is intentionally left empty to support HikariCP connection.
+     *
      * @param level
      * @throws SQLException
      */
@@ -185,6 +242,7 @@ public class TSDBConnection implements Connection {
 
     /**
      * The transaction isolation level option is not supported by TDengine.
+     *
      * @return
      * @throws SQLException
      */
@@ -237,6 +295,7 @@ public class TSDBConnection implements Connection {
 
     /**
      * the transaction is not supported by TDengine, so the opened ResultSet Objects will remain open
+     *
      * @return
      * @throws SQLException
      */
@@ -313,7 +372,7 @@ public class TSDBConnection implements Connection {
     }
 
     public void setClientInfo(Properties properties) throws SQLClientInfoException {
-		for (Enumeration<Object> enumer = properties.keys(); enumer.hasMoreElements();) {
+        for (Enumeration<Object> enumer = properties.keys(); enumer.hasMoreElements(); ) {
             String name = (String) enumer.nextElement();
             clientInfoProps.put(name, properties.getProperty(name));
         }