feat: add a simple TaskRunner system

1. solve multiple threads problem.

1 files changed, 88 insertions, 0 deletions

diff --git a/src/core/thread/FileReadTask.cpp b/src/core/thread/FileReadTask.cpp
new file mode 100644
index 00000000..3a235390
--- /dev/null
+++ b/src/core/thread/FileReadTask.cpp
@@ -0,0 +1,88 @@
+/**
+ * Copyright (C) 2021 Saturneric
+ *
+ * This file is part of GpgFrontend.
+ *
+ * GpgFrontend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GpgFrontend 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 General Public License
+ * along with GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from
+ * the gpg4usb project, which is under GPL-3.0-or-later.
+ *
+ * The source code version of this software was modified and released
+ * by Saturneric<[email protected]><[email protected]> starting on May 12, 2021.
+ *
+ */
+
+#include "core/thread/FileReadTask.h"
+
+#include <utility>
+
+namespace GpgFrontend::UI {
+
+FileReadTask::FileReadTask(std::string path) {
+  connect(this, &FileReadTask::SignalFileBytesReadNext, this,
+          &FileReadTask::read_bytes);
+
+#ifdef WINDOWS
+  std::filesystem::path read_file_path(
+      QString::fromStdString(path).toStdU16String());
+#else
+  std::filesystem::path read_file_path(
+      QString::fromStdString(path).toStdString());
+#endif
+  read_file_path_ = read_file_path;
+}
+
+void FileReadTask::Run() {
+  SetFinishAfterRun(false);
+
+  if (is_regular_file(read_file_path_)) {
+    LOG(INFO) << "read open file" << read_file_path_;
+
+    target_file_.setFileName(
+        QString::fromStdString(read_file_path_.u8string()));
+    target_file_.open(QIODevice::ReadOnly);
+
+    if (!(target_file_.isOpen() && target_file_.isReadable())) {
+      LOG(ERROR) << "file not open or not readable";
+      if (target_file_.isOpen()) target_file_.close();
+      return;
+    }
+    LOG(INFO) << "started reading" << read_file_path_;
+    read_bytes();
+  } else {
+    emit SignalFileBytesReadEnd();
+  }
+}
+
+void FileReadTask::read_bytes() {
+  QByteArray read_buffer;
+  if (!target_file_.atEnd() &&
+      (read_buffer = target_file_.read(buffer_size_)).size() > 0) {
+    LOG(INFO) << "read bytes" << read_buffer.size();
+    emit SignalFileBytesRead(std::move(read_buffer));
+  } else {
+    LOG(INFO) << "read bytes end";
+    emit SignalFileBytesReadEnd();
+    // finish task
+    emit SignalTaskFinished();
+  }
+}
+
+FileReadTask::~FileReadTask() {
+  LOG(INFO) << "close file" << read_file_path_;
+  if (target_file_.isOpen()) target_file_.close();
+}
+
+}  // namespace GpgFrontend::UI