Databases
StackOverflow2013
Postsdbo
POUnable to do client-server communication via sockets in Python
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POUnable to do client-server communication via sockets in Python
    primarykey
    data
    text
    <p>I have been banging my head against a socket issue for the last two weeks to no avail. I have a setup of 12 'client' machines and one server machine. The server is given a large task, splits it into 12 smaller tasks and then distributes them to the 12 clients. The clients churn away and once they finish their task, they are supposed to let the server know that they have finished via socket communication. For some reason, this has only been working spottily or not at all (both, the server and the clients, just sit in the while loop). </p> <p>Here is the code on the server:</p> <pre><code>socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) socket.bind(('localhost', RandomPort)) socket.listen(0) socket.settimeout(0.9) [Give all the clients their tasks, then do the following:] while 1: data = 'None' IP = [0,0] try: Client, IP = socket.accept() data = Client.recv(1024) if data == 'Done': Client.send('Thanks') for ClientIP in ClientIPList(): if ClientIP == IP[0] and data == 'Done': FinishedCount += 1 if FinishedCount == 12: break except: pass </code></pre> <p>Here is the code on all the clients: </p> <pre><code>[Receive task from server and execute. Once finished, do the following:] while 1: try: f = socket.socket(socket.AF_INET, socket.SOCK_STREAM) f.connect((IPofServer, RandomPort)) f.settimeout(0.5) f.send('Done') data = f.recv(1024) if data == 'Thanks': f.shutdown(socket.SHUT_RDWR) f.close() break except: f.close() time.sleep(2+random.random()*5) </code></pre> <p>I have used Wireshark and found that the packets are flying around. Yet, the "FinishedCount" never seems to increase... Is there anything glaringly wrong that I have missed in setting this up? This is my first exposure to sockets....</p> <p>Thank you all for your help in advance!</p> <p>EDIT: I've made the following changes to the code:</p> <p>On the server: socket.listen is now socket.listen(5)</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USnodapic
    1. USnodapic
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POUnable to do client-server communication via sockets in Python
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POUnable to do client-server communication via sockets in Python
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POUnable to do client-server communication via sockets in Python
      1. This table or related slice is empty.
      1. VTUpMod
    1. COTip: you should never use uppercase as the first letter of a variable. That syntax should always be left for class names. Question: why is the client in a while 1 loop? Why not just send once to say "Im done" then move on? Is the data not sending the first time?
      singulars
      1. POUnable to do client-server communication via sockets in Python
      1. USchown
    2. COAh - good to know. Thanks.
      singulars
      1. POUnable to do client-server communication via sockets in Python
      1. USnodapic
    3. COI put it in a while loop because I'm worried about the connection being refused by the server because he's already handling other clients. It's my attempt at making sure we have a positive handshake...
      singulars
      1. POUnable to do client-server communication via sockets in Python
      1. USnodapic
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload