Implementation of the API queue

Makefile

@@ -14,7 +14,8 @@ mypy: ## Run static type checker
 		securedrop_client/gui/__init__.py \
 		securedrop_client/resources/__init__.py \
 		securedrop_client/storage.py \
-		securedrop_client/message_sync.py
+		securedrop_client/message_sync.py \
+		securedrop_client/queue.py
 
 .PHONY: clean
 clean:  ## Clean the workspace of generated resources

create_dev_data.py

@@ -3,10 +3,11 @@
 import os
 import sys
 from securedrop_client.config import Config
-from securedrop_client.db import Base, make_engine
+from securedrop_client.db import Base, make_session_maker
 
 sdc_home = sys.argv[1]
-Base.metadata.create_all(make_engine(sdc_home))
+session = make_session_maker(sdc_home)()
+Base.metadata.create_all(bind=session.get_bind())
 
 with open(os.path.join(sdc_home, Config.CONFIG_NAME), 'w') as f:
     f.write(json.dumps({

securedrop_client/app.py

@@ -25,15 +25,14 @@
 import sys
 import socket
 from argparse import ArgumentParser
-from sqlalchemy.orm import sessionmaker
 from PyQt5.QtWidgets import QApplication, QMessageBox
 from PyQt5.QtCore import Qt, QTimer
 from logging.handlers import TimedRotatingFileHandler
 from securedrop_client import __version__
 from securedrop_client.logic import Controller
 from securedrop_client.gui.main import Window
 from securedrop_client.resources import load_icon, load_css
-from securedrop_client.db import make_engine
+from securedrop_client.db import make_session_maker
 from securedrop_client.utils import safe_mkdir
 
 DEFAULT_SDC_HOME = '~/.securedrop_client'
@@ -185,15 +184,14 @@ def start_app(args, qt_args) -> None:
 
     prevent_second_instance(app, args.sdc_home)
 
+    session_maker = make_session_maker(args.sdc_home)
+
     gui = Window()
+
     app.setWindowIcon(load_icon(gui.icon))
     app.setStyleSheet(load_css('sdclient.css'))
 
-    engine = make_engine(args.sdc_home)
-    Session = sessionmaker(bind=engine)
-    session = Session()
-
-    controller = Controller("http://localhost:8081/", gui, session,
+    controller = Controller("http://localhost:8081/", gui, session_maker,
                             args.sdc_home, not args.no_proxy)
     controller.setup()
 

securedrop_client/crypto.py

@@ -22,11 +22,11 @@
 import subprocess
 import tempfile
 
-from sqlalchemy.orm import sessionmaker
+from sqlalchemy.orm import scoped_session
 from uuid import UUID
 
 from securedrop_client.config import Config
-from securedrop_client.db import make_engine, Source
+from securedrop_client.db import Source
 from securedrop_client.utils import safe_mkdir
 
 logger = logging.getLogger(__name__)
@@ -39,17 +39,15 @@ class CryptoError(Exception):
 
 class GpgHelper:
 
-    def __init__(self, sdc_home: str, is_qubes: bool) -> None:
+    def __init__(self, sdc_home: str, session_maker: scoped_session, is_qubes: bool) -> None:
         '''
         :param sdc_home: Home directory for the SecureDrop client
         :param is_qubes: Whether the client is running in Qubes or not
         '''
         safe_mkdir(os.path.join(sdc_home), "gpg")
         self.sdc_home = sdc_home
         self.is_qubes = is_qubes
-        engine = make_engine(sdc_home)
-        Session = sessionmaker(bind=engine)
-        self.session = Session()
+        self.session_maker = session_maker
 
         config = Config.from_home_dir(self.sdc_home)
         self.journalist_key_fingerprint = config.journalist_key_fingerprint
@@ -110,13 +108,14 @@ def _gpg_cmd_base(self) -> list:
         return cmd
 
     def import_key(self, source_uuid: UUID, key_data: str, fingerprint: str) -> None:
-        local_source = self.session.query(Source).filter_by(uuid=source_uuid).one()
+        session = self.session_maker()
+        local_source = session.query(Source).filter_by(uuid=source_uuid).one()
 
         self._import(key_data)
 
         local_source.fingerprint = fingerprint
-        self.session.add(local_source)
-        self.session.commit()
+        session.add(local_source)
+        session.commit()
 
     def _import(self, key_data: str) -> None:
         '''Wrapper for `gpg --import-keys`'''
@@ -145,7 +144,8 @@ def encrypt_to_source(self, source_uuid: str, data: str) -> str:
         '''
         :param data: A string of data to encrypt to a source.
         '''
-        source = self.session.query(Source).filter_by(uuid=source_uuid).one()
+        session = self.session_maker()
+        source = session.query(Source).filter_by(uuid=source_uuid).one()
         cmd = self._gpg_cmd_base()
 
         with tempfile.NamedTemporaryFile('w+') as content, \

securedrop_client/db.py

@@ -4,9 +4,8 @@
 
 from sqlalchemy import Boolean, Column, create_engine, DateTime, ForeignKey, Integer, String, \
     Text, MetaData, CheckConstraint, text, UniqueConstraint
-from sqlalchemy.engine import Engine
 from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import relationship, backref
+from sqlalchemy.orm import relationship, backref, scoped_session, sessionmaker
 
 
 convention = {
@@ -22,9 +21,11 @@
 Base = declarative_base(metadata=metadata)  # type: Any
 
 
-def make_engine(home: str) -> Engine:
+def make_session_maker(home: str) -> scoped_session:
     db_path = os.path.join(home, 'svs.sqlite')
-    return create_engine('sqlite:///{}'.format(db_path))
+    engine = create_engine('sqlite:///{}'.format(db_path))
+    maker = sessionmaker(bind=engine)
+    return scoped_session(maker)
 
 
 class Source(Base):
@@ -215,8 +216,5 @@ class User(Base):
     uuid = Column(String(36), unique=True, nullable=False)
     username = Column(String(255), nullable=False)
 
-    def __init__(self, username: str) -> None:
-        self.username = username
-
     def __repr__(self) -> str:
         return "<Journalist: {}>".format(self.username)

securedrop_client/gui/main.py

@@ -20,9 +20,9 @@
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 import logging
+
 from gettext import gettext as _
 from typing import Dict, List, Optional  # noqa: F401
-
 from PyQt5.QtWidgets import QMainWindow, QWidget, QHBoxLayout, QVBoxLayout, QDesktopWidget, \
     QApplication
 
@@ -43,7 +43,7 @@ class Window(QMainWindow):
 
     icon = 'icon.png'
 
-    def __init__(self):
+    def __init__(self) -> None:
         """
         Create the default start state. The window contains a root widget into
         which is placed:

securedrop_client/gui/widgets.py

@@ -18,13 +18,13 @@
 """
 import logging
 import arrow
-from gettext import gettext as _
 import html
 import sys
+
+from gettext import gettext as _
 from typing import List
 from uuid import uuid4
-
-from PyQt5.QtCore import Qt, pyqtSlot, pyqtSignal, QTimer, QSize
+from PyQt5.QtCore import Qt, pyqtSlot, pyqtSignal, QTimer, QSize, pyqtBoundSignal, QObject
 from PyQt5.QtGui import QIcon, QPalette, QBrush, QColor, QFont, QLinearGradient
 from PyQt5.QtWidgets import QListWidget, QLabel, QWidget, QListWidgetItem, QHBoxLayout, \
     QPushButton, QVBoxLayout, QLineEdit, QScrollArea, QDialog, QAction, QMenu, QMessageBox, \
@@ -587,7 +587,7 @@ class MainView(QWidget):
     }
     '''
 
-    def __init__(self, parent):
+    def __init__(self, parent: QObject):
         super().__init__(parent)
 
         self.setStyleSheet(self.CSS)
@@ -1274,58 +1274,52 @@ class FileWidget(QWidget):
     Represents a file.
     """
 
-    def __init__(self, source_db_object, submission_db_object,
-                 controller, file_ready_signal, align="left"):
+    def __init__(
+        self,
+        file_uuid: str,
+        controller: Controller,
+        file_ready_signal: pyqtBoundSignal,
+    ) -> None:
         """
-        Given some text, an indication of alignment ('left' or 'right') and
-        a reference to the controller, make something to display a file.
-
-        Align is set to left by default because currently SecureDrop can only
-        accept files from sources to journalists.
+        Given some text and a reference to the controller, make something to display a file.
         """
         super().__init__()
         self.controller = controller
-        self.source = source_db_object
-        self.submission = submission_db_object
-        self.file_uuid = self.submission.uuid
-        self.align = align
+        self.file = self.controller.get_file(file_uuid)
 
         self.layout = QHBoxLayout()
         self.update()
         self.setLayout(self.layout)
 
-        file_ready_signal.connect(self._on_file_download)
+        file_ready_signal.connect(self._on_file_downloaded, type=Qt.QueuedConnection)
 
-    def update(self):
+    def update(self) -> None:
         icon = QLabel()
         icon.setPixmap(load_image('file.png'))
 
-        if self.submission.is_downloaded:
+        if self.file.is_downloaded:
             description = QLabel("Open")
         else:
-            human_filesize = humanize_filesize(self.submission.size)
+            human_filesize = humanize_filesize(self.file.size)
             description = QLabel("Download ({})".format(human_filesize))
 
-        if self.align != "left":
-            # Float right...
-            self.layout.addStretch(5)
-
         self.layout.addWidget(icon)
         self.layout.addWidget(description, 5)
+        self.layout.addStretch(5)
 
-        if self.align == "left":
-            # Add space on right hand side...
-            self.layout.addStretch(5)
-
-    def clear(self):
+    def clear(self) -> None:
         while self.layout.count():
             child = self.layout.takeAt(0)
             if child.widget():
                 child.widget().deleteLater()
 
     @pyqtSlot(str)
-    def _on_file_download(self, file_uuid: str) -> None:
-        if file_uuid == self.file_uuid:
+    def _on_file_downloaded(self, file_uuid: str) -> None:
+        if file_uuid == self.file.uuid:
+            # update state
+            self.file = self.controller.get_file(self.file.uuid)
+
+            # update gui
             self.clear()  # delete existing icon and label
             self.update()  # draw modified widget
 
@@ -1334,12 +1328,15 @@ def mouseReleaseEvent(self, e):
         Handle a completed click via the program logic. The download state
         of the file distinguishes which function in the logic layer to call.
         """
-        if self.submission.is_downloaded:
+        # update state
+        self.file = self.controller.get_file(self.file.uuid)
+
+        if self.file.is_downloaded:
             # Open the already downloaded file.
-            self.controller.on_file_open(self.submission)
+            self.controller.on_file_open(self.file.uuid)
         else:
             # Download the file.
-            self.controller.on_file_download(self.source, self.submission)
+            self.controller.on_submission_download(File, self.file.uuid)
 
 
 class ConversationView(QWidget):
@@ -1351,7 +1348,11 @@ class ConversationView(QWidget):
     https://github.com/freedomofpress/securedrop-client/issues/273
     """
 
-    def __init__(self, source_db_object: Source, controller: Controller):
+    def __init__(
+        self,
+        source_db_object: Source,
+        controller: Controller,
+    ):
         super().__init__()
         self.source = source_db_object
         self.controller = controller
@@ -1403,8 +1404,12 @@ def add_file(self, source_db_object, submission_db_object):
         Add a file from the source.
         """
         self.conversation_layout.addWidget(
-            FileWidget(source_db_object, submission_db_object,
-                       self.controller, self.controller.file_ready))
+            FileWidget(
+                submission_db_object.uuid,
+                self.controller,
+                self.controller.file_ready,
+            ),
+        )
 
     def update_conversation_position(self, min_val, max_val):
         """
@@ -1472,9 +1477,12 @@ class SourceConversationWrapper(QWidget):
     per-source resources.
     """
 
-    def __init__(self, source: Source, controller: Controller) -> None:
+    def __init__(
+        self,
+        source: Source,
+        controller: Controller,
+    ) -> None:
         super().__init__()
-
         layout = QVBoxLayout()
         layout.setContentsMargins(0, 0, 0, 0)
         self.setLayout(layout)