Use initCause when throw exceptions in Init process to pass the real reason for failure when loading TdLib

Fix https://github.com/ErnyTech/JTDLib/issues/2

Signed-off-by: Ernesto Castellotti <erny.castell@gmail.com>

src/main/java/it/ernytech/tdlib/Client.java

@@ -44,10 +44,10 @@ public class Client {
     public Client() {
         try {
             Init.start();
-        } catch (CantLoadLibrary cantLoadLibrary) {
+        } catch (Throwable throwable) {
-            throw new MissingTdlibLibrary();
+            throwable.printStackTrace();
+            System.exit(1);
         }
-
         this.clientId = createNativeClient();
     }
 

src/main/java/it/ernytech/tdlib/Log.java

@@ -30,8 +30,9 @@ public class Log {
     static {
         try {
             Init.start();
-        } catch (CantLoadLibrary cantLoadLibrary) {
+        } catch (Throwable throwable) {
-            throw new MissingTdlibLibrary();
+            throwable.printStackTrace();
+            System.exit(0);
         }
     }
 

src/main/java/it/ernytech/tdlib/utils/CantLoadLibrary.java

@@ -20,7 +20,7 @@ package it.ernytech.tdlib.utils;
 /**
  * An exception that is thrown when the LoadLibrary class fails to load the library.
  */
-public class CantLoadLibrary extends Exception {
+public class CantLoadLibrary extends RuntimeException {
     /**
      * Creates a new CantLoadLibrary exception.
      */

src/main/java/it/ernytech/tdlib/utils/Init.java

@@ -27,7 +27,7 @@ public class Init {
      * Initialize Tdlib
      * @throws CantLoadLibrary An exception that is thrown when the LoadLibrary class fails to load the library.
      */
-    public static void start() throws CantLoadLibrary {
+    public static void start() throws Throwable {
         var os = LoadLibrary.getOs();
 
         if (os == Os.win) {

src/main/java/it/ernytech/tdlib/utils/LoadLibrary.java

@@ -32,9 +32,9 @@ public class LoadLibrary {
      * @param libname The name of the library.
      * @throws CantLoadLibrary An exception that is thrown when the LoadLibrary class fails to load the library.
      */
-    public static void load(String libname) throws CantLoadLibrary {
+    public static void load(String libname) throws Throwable {
         if (libname == null || libname.trim().isEmpty()) {
-            throw new CantLoadLibrary();
+            throw new IllegalArgumentException();
         }
 
         if (libraryLoaded.containsKey(libname)) {
@@ -47,8 +47,8 @@ public class LoadLibrary {
         libraryLoaded.put(libname, true);
     }
 
-    private static void loadLibrary(String libname) throws CantLoadLibrary {
+    private static void loadLibrary(String libname) throws Throwable {
-        if (loadSysLibrary(libname) == 0) {
+        if (loadSysLibrary(libname)) {
             return;
         }
 
@@ -56,66 +56,40 @@ public class LoadLibrary {
         var os = getOs();
 
         if (arch == Arch.unknown) {
-            throw new CantLoadLibrary();
+            throw new CantLoadLibrary().initCause(new IllegalStateException("Arch: \"" + System.getProperty("os.arch") + "\" is unknown"));
         }
 
         if (os == Os.unknown) {
-            throw new CantLoadLibrary();
+            throw new CantLoadLibrary().initCause(new IllegalStateException("Os: \"" + System.getProperty("os.name") + "\" is unknown"));
         }
 
-        if (loadJarLibrary(libname, arch, os) == 0) {
+        try {
-            return;
+            loadJarLibrary(libname, arch, os);
+        } catch (IOException | CantLoadLibrary | UnsatisfiedLinkError e) {
+            throw new CantLoadLibrary().initCause(e);
         }
-
-        throw new CantLoadLibrary();
     }
 
-    private static int loadSysLibrary(String libname) {
+    private static boolean loadSysLibrary(String libname) {
         try {
             System.loadLibrary(libname);
         } catch (UnsatisfiedLinkError e) {
-            return 1;
+            return false;
         }
 
-        return 0;
+        return true;
     }
 
-    private static int loadJarLibrary(String libname, Arch arch, Os os) {
+    private static void loadJarLibrary(String libname, Arch arch, Os os) throws IOException, CantLoadLibrary {
-        Path tempPath;
+        Path tempPath = Files.createTempDirectory(libname);
-
-        try {
-            tempPath = Files.createTempDirectory(libname);
-        } catch (IOException e) {
-            return 1;
-        }
-
         deleteOnExit(tempPath);
         Path tempFile = Paths.get(tempPath.toString(), libname + getExt(os));
         deleteOnExit(tempPath);
         var libInputStream = LoadLibrary.class.getResourceAsStream(createPath("libs", os.name(), arch.name(), libname) + getExt(os));
-
+        Files.copy(libInputStream, tempFile, StandardCopyOption.REPLACE_EXISTING);
-        try {
+        System.load(tempFile.toFile().getAbsolutePath());
-            Files.copy(libInputStream, tempFile, StandardCopyOption.REPLACE_EXISTING);
-        } catch (IOException e) {
-            return 1;
-        }
-
-        try {
-            loadLibraryPath(tempFile);
-        } catch (CantLoadLibrary cantLoadLibrary) {
-            return 1;
-        }
-
-        return 0;
     }
 
-    private static void loadLibraryPath(Path path) throws CantLoadLibrary {
-        try {
-            System.load(path.toFile().getAbsolutePath());
-        } catch (UnsatisfiedLinkError e) {
-            throw new CantLoadLibrary();
-        }
-    }
 
     private static Arch getCpuArch() {
         var arch = System.getProperty("os.arch").trim();

src/main/java/it/ernytech/tdlib/utils/MissingTdlibLibrary.java

@@ -1,30 +0,0 @@
-/*
- * Copyright (c) 2018. Ernesto Castellotti <erny.castell@gmail.com>
- * This file is part of JTdlib.
- *
- *     JTdlib is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU Lesser General Public License as published by
- *     the Free Software Foundation, either version 3 of the License.
- *
- *     JTdlib is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU Lesser General Public License
- *     along with JTdlib.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package it.ernytech.tdlib.utils;
-
-/**
- * An runtime exception that is thrown when the libraries needed for Tdlib have not been loaded.
- */
-public class MissingTdlibLibrary extends RuntimeException {
-    /**
-     * Creates a new MissingTdlibLibrary runtime exception.
-     */
-    public MissingTdlibLibrary() {
-        super("Tdlib library has not been loaded, so execution can't continue");
-    }
-}