feat(db): remove rocksDB compatibility with LevelDB

   for later updating RocksDB

Author: halibobo1205

chainbase/src/main/java/org/tron/common/storage/rocksdb/RocksDbDataSourceImpl.java

@@ -196,7 +196,12 @@ public void setDBName(String name) {
   public boolean checkOrInitEngine() {
     String dir = getDbPath().toString();
     String enginePath = dir + File.separator + "engine.properties";
-
+    File currentFile = new File(dir, "CURRENT");
+    if (currentFile.exists() && !Paths.get(enginePath).toFile().exists()) {
+      // if the CURRENT file exists, but the engine.properties file does not exist, it is LevelDB
+      logger.error(" You are trying to open a LevelDB database with RocksDB engine.");
+      return false;
+    }
     if (FileUtil.createDirIfNotExists(dir)) {
       if (!FileUtil.createFileIfNotExists(enginePath)) {
         return false;

plugins/README.md

@@ -34,15 +34,13 @@ DB convert provides a helper which can convert LevelDB data to RocksDB data, par
 
 - `<src>`: Input path for leveldb, default: output-directory/database.
 - `<dest>`: Output path for rocksdb, default: output-directory-dst/database.
-- `--safe`: In safe mode, read data from leveldb then put into rocksdb, it's a very time-consuming procedure. If not, just change engine.properties from leveldb to rocksdb, rocksdb
-  is compatible with leveldb for the current version. This may not be the case in the future, default: false.
 - `-h | --help`: Provide the help info.
 
 ### Examples:
 
 ```shell script
 # full command
-  java -jar Toolkit.jar db convert [-h] [--safe] <src> <dest>
+  java -jar Toolkit.jar db convert [-h] <src> <dest>
 # examples
   java -jar Toolkit.jar db convert  output-directory/database /tmp/database
 ```

plugins/src/main/java/org/tron/plugins/DbConvert.java

@@ -49,13 +49,7 @@ public class DbConvert implements Callable<Integer> {
       description = "Output path for rocksdb. Default: ${DEFAULT-VALUE}")
   private File dest;
 
-  @CommandLine.Option(names = {"--safe"},
-      description = "In safe mode, read data from leveldb then put rocksdb."
-          + "If not, just change engine.properties from leveldb to rocksdb,"
-          + "rocksdb is compatible with leveldb for current version."
-          + "This may not be the case in the future."
-          + "Default: ${DEFAULT-VALUE}")
-  private boolean safe;
+  private final boolean safe = true;
 
   @CommandLine.Option(names = {"-h", "--help"})
   private boolean help;

plugins/src/test/java/org/tron/plugins/DbConvertTest.java

@@ -15,13 +15,6 @@ public void testRun() throws IOException {
     Assert.assertEquals(0, cli.execute(args));
   }
 
-  @Test
-  public void testRunWithSafe() throws IOException {
-    String[] args = new String[] { "db", "convert",  INPUT_DIRECTORY,
-        temporaryFolder.newFolder().toString(),"--safe" };
-    Assert.assertEquals(0, cli.execute(args));
-  }
-
   @Test
   public void testHelp() {
     String[] args = new String[] {"db", "convert", "-h"};