Terminal uses Qt

.pylintrc

@@ -1,4 +1,5 @@
 [MASTER]
+extension-pkg-whitelist = PySide
 init-hook = import sys; sys.path.append('./selenium.egg')
 
 [MESSAGES CONTROL]

client.py

@@ -19,31 +19,77 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-import sys
-from threading import Thread
 import configparser
+import errno
+import os
+from PySide.QtCore import QObject, Qt, Signal
+from PySide.QtGui import QApplication
+from PySide.QtWebKit import QWebView
+from threading import current_thread, main_thread, Thread
+from time import sleep
 
-sys.path.append("./selenium.egg")
 
-from selenium.webdriver import Firefox
+def current_thread_is_main():
+    return current_thread() is main_thread()
 
 
-def load_config():
-    config = configparser.ConfigParser()
-    config.read('config')
-    return config['Terminal']
+class Browser(QObject):
+    # pylint: disable=too-many-public-methods
 
+    __execute_script_called = Signal(str)
 
-def user_scanner(driver, package):
-    config = load_config()
-    scanner = open(config["user_scanner"])
+    def __init__(self):
+        super().__init__()
+
+        self.app = QApplication([])
+
+        self.webview = QWebView()
+        self.webview.setAttribute(Qt.WA_DeleteOnClose)
+        self.webview.destroyed.connect(self.app.quit)
+
+        self.__execute_script_called.connect(self.__execute_script)
+
+    def __execute_script(self, javascript_code: str):
+        assert current_thread_is_main()
+        self.webview.page().mainFrame().evaluateJavaScript(javascript_code)
+
+    def execute_script(self, javascript_code: str):
+        if current_thread_is_main():
+            self.__execute_script(javascript_code)
+        else:
+            self.__execute_script_called.emit(javascript_code)
+
+    def run(self, url):
+        assert current_thread_is_main()
+        self.webview.show()
+        self.webview.load(url)
+        self.app.exec_()
+
+
+def opener_nonblock(path, mode):
+    return os.open(path, mode | os.O_NONBLOCK)
+
+
+def readline_nonblock(fileobject) -> 'Optional[str]':
+    try:
+        return fileobject.readline() or None
+    except OSError as err:
+        if err.errno == errno.EAGAIN or err.errno == errno.EWOULDBLOCK:
+            return None
+
+
+def user_scanner(config, browser):
+    scanner = open(config["user_scanner"], opener=opener_nonblock)
     while True:
-        new_user = scanner.read().strip("\2\3\r\n")
-        driver.execute_script("user(" + new_user + ")")
+        data = readline_nonblock(scanner)
+        if data is not None:
+            new_user = data.strip("\2\3\r\n")
+            browser.execute_script("user(" + new_user + ")")
+        else:
+            sleep(0.1)
 
 
-def book_scanner(driver, package):
-    config = load_config()
+def book_scanner(config, browser):
     while True:
         scanner = open(config["book_scanner"], "rb")
         i = 0
@@ -61,21 +107,26 @@ def book_scanner(driver, package):
                 break
             print(number % 10)
             barcode += str(number % 10)
-        driver.execute_script("barcode(" + barcode + ")")
+        browser.execute_script("barcode(" + barcode + ")")
 
 
 def main():
-    driver = Firefox()
-    driver.get("http://yandex.ru/")
-    package = {
-        "user": "",
-        "book": "",
-    }
-    user = Thread(target=user_scanner, args=(driver, package))
-    book = Thread(target=book_scanner, args=(driver, package))
+    def load_config():
+        config = configparser.ConfigParser()
+        config.read('config')
+        return config['Terminal']
+
+    config = load_config()
+
+    browser = Browser()
+
+    user = Thread(target=user_scanner, args=(config, browser), daemon=True)
+    book = Thread(target=book_scanner, args=(config, browser), daemon=True)
     user.start()
     book.start()
 
+    browser.run(config['operations_url'])
+
 
 if __name__ == '__main__':
     main()

config

@@ -6,6 +6,6 @@ librarian_pages = ["handed", "journal", "add", "operations", "users", "books"]
 student_pages = ["handed", "books"]
 
 [Terminal]
-user_scanner = ""
-book_scanner = "/dev/input/by-id/usb-WIT_Electron_Company_WIT_122-UFS_V2.03-event-kbd"
-operations_url = "http://localhost"
+user_scanner = user_scanner
+book_scanner = /dev/input/by-id/usb-WIT_Electron_Company_WIT_122-UFS_V2.03-event-kbd
+operations_url = http://localhost:1303

test.py

@@ -28,8 +28,6 @@
     "--show-source",
     "--ignore=" + ','.join([
         'E251',   # unexpected spaces around keyword / parameter equals
-        'E402',   # module level import not at top of file
-                  # for import selenium.egg
         'W503',   # line break before binary operator
     ]),
 ]