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osp:project:assignment [2016/10/30 19:37] vlad.traista [Tasks] |
osp:project:assignment [2017/01/10 17:36] (current) vlad.traista [Server revisions] |
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| ====== Assignment ====== | ====== Assignment ====== | ||
| * **Deadline: January 15th, 2017** | * **Deadline: January 15th, 2017** | ||
| - | * Upload the assignment at the following location: TODO. | + | * Upload the assignment at the following [[http://cs.curs.pub.ro/2016/mod/assign/view.php?id=3433|location]]. |
| * You should upload a zip archive containing: | * You should upload a zip archive containing: | ||
| * the sources of the application | * the sources of the application | ||
| Line 10: | Line 10: | ||
| * Make sure that your team is registered [[http://ocw.cs.pub.ro/courses/osp/project/team-choice|here]]. | * Make sure that your team is registered [[http://ocw.cs.pub.ro/courses/osp/project/team-choice|here]]. | ||
| * A single team member must upload the assignment. The team members should be mentioned in the README file. | * A single team member must upload the assignment. The team members should be mentioned in the README file. | ||
| + | * The assignment has to be presented to the OSP team on **January 16th, 2017**, at **19:00**, in **PRECIS 703**. An assignment that is not presented will have a penalty of 1 point (out of 10). | ||
| ==== General description ==== | ==== General description ==== | ||
| Line 22: | Line 23: | ||
| If the Android client application is developed using an Android mobile device, a WiFi connection is required in order for the client to be able to communicate with the server. | If the Android client application is developed using an Android mobile device, a WiFi connection is required in order for the client to be able to communicate with the server. | ||
| - | If the Android client application is developed on an emulator, there is no need for a WiFi connection since the communication will be done using local sockets (localhost/127.0.0.1). | + | If the Android client application is developed on an emulator, there is no need for a WiFi connection since the communication will be done on the local host. For the Android application to be able to access the server on the host machine, you will have to use the following IP address 10.0.2.2 (magic). This IP address is the address of a virtual router that isolates the emulator network interfaces from the host's network interfaces. When accessing this IP from the emulator, it will be translated to the IP of the host. |
| + | |||
| + | ==== Server revisions ==== | ||
| + | |||
| + | This section will contain all the changes and bug fixes applied to the Python server code: | ||
| + | |||
| + | * **07.01.2017** | ||
| + | * changed the address on which the server listens from the localhost address (127.0.0.1) to any address (0.0.0.0 or "") in order to allow a mobile device to connect through WiFi to the server. | ||
| + | <spoiler Diff><code> | ||
| + | 265c265 | ||
| + | < server.bind(("127.0.0.1", 4000)) | ||
| + | --- | ||
| + | > server.bind(("", 4000)) | ||
| + | </code></spoiler> | ||
| + | * **09.01.2017** | ||
| + | * fixed an issue that did not close the sockets when the remote end gracefully or forcefully closes the connection (e.g WiFi interface goes down). These changes are reflected in the server_experimental.py file which was added in the archive with the server code. | ||
| + | <spoiler Diff><code> | ||
| + | @@ -160,12 +160,26 @@ | ||
| + | buf = b'' | ||
| + | running = True | ||
| + | while running: | ||
| + | - aux_buf = self.socket.recv(4096) | ||
| + | + try: | ||
| + | + aux_buf = self.socket.recv(4096) | ||
| + | + except Exception as e: | ||
| + | + running = False | ||
| + | + print("Client disconnected...") | ||
| + | + try: | ||
| + | + clients.remove(self) | ||
| + | + self.socket.close() | ||
| + | + except Exception as e: | ||
| + | + print("Server encountered following error: %s" % str(e)) | ||
| + | |||
| + | if len(aux_buf) == 0: | ||
| + | buf += b'\0' | ||
| + | running = False | ||
| + | print("Client exiting...") | ||
| + | + try: | ||
| + | + clients.remove(self) | ||
| + | + self.socket.close() | ||
| + | + except Exception as e: | ||
| + | + print("Server encountered following error: %s" % str(e)) | ||
| + | else: | ||
| + | buf += aux_buf | ||
| + | </code></spoiler> | ||
| ==== Tasks ==== | ==== Tasks ==== | ||
| Line 122: | Line 167: | ||
| === Task 6: Service reconnect (1p) === | === Task 6: Service reconnect (1p) === | ||
| - | Add a broadcast receiver component which reconnects the service when the internet comes back online (if previous state was logged in). | + | Add a broadcast receiver component which reconnects the service when the internet comes back online (if previous state was logged in). If the user was previously logged in, the reconnect procedure should restart the login procedure (the JSON messages). |
| + | |||
| + | <note warning> | ||
| + | When implementing this receiver, it will most likely listen to events caused by the change of network connectivity state (WiFi interface goes down or up). However, when a WiFi interface goes up it transitions multiple times into the CONNECTED state which means that the receiver will receive that event multiple times. **The reconnect procedure needs to be done only one time once the WiFi interface is up.** | ||
| + | </note> | ||
| + | |||
