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$.post() possible race condition; issues with redirect


$.post() possible race condition; issues with redirect

By : Martin Uran
Date : October 18 2020, 01:08 AM
may help you . Redirect to secondPage.php in the Javascript, not PHP. And do it in the callback function of $.post so it waits for the script to complete.
code :
        var send = function(){
            if(message !== ""){
                $.post("includes/changePage.inc.php", {message: message}, function() {
                    window.location.href = "includes/secondPage.php";
                });
            }
        };
$("#saveForm").submit(function() {
  $("#message").val("You wrote: " + $("#text").val());
}
<textArea id="text"></textArea>
<form id="saveForm" action="includes/changePage.inc.php" method="POST">
  <input type="hidden" name="message" id="message">
  <button type="submit" id="saveButton">Save!</button>    
</form>


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Activerecord transaction concurrency race condition issues

Activerecord transaction concurrency race condition issues


By : sayed mosaad
Date : March 29 2020, 07:55 AM
I wish this help you Sounds like you need idempotent requests so that request replay is ineffective. Where possible implement operations so that repeating them has no effect. Where not possible, give each request a unique request identifier and record whether requests have been satisfied or not. You can keep the request ID information in an UNLOGGED table in PostgreSQL or in redis/memcached since you don't need it to be persistent. This will prevent a whole class of exploits.
To deal with just this one problem create an AFTER INSERT OR DELETE ... FOR EACH ROW EXECUTE PROCEDURE trigger on the user items table. Have this trigger:
code :
BEGIN
    -- Lock the user so only one tx can be inserting/deleting items for this user
    -- at the same time
    SELECT 1 FROM user WHERE user_id = <the-user-id> FOR UPDATE;

    IF TG_OP = 'INSERT' THEN
        IF (SELECT count(user_item_id) FROM user_item WHERE user_item.user_id = <the-user-id>) > 100 THEN
            RAISE EXCEPTION 'Too many items already owned, adding this item would exceed the limit of 100 items';
        END IF;
    ELIF TG_OP = 'DELETE' THEN
       -- No action required, all we needed to do is take the lock
       -- so a concurrent INSERT won't run until this tx finishes
    ELSE 
        RAISE EXCEPTION 'Unhandled trigger case %',TG_OP;
    END IF;
    RETURN NULL;
END;
Can Express.js have a race condition on post

Can Express.js have a race condition on post


By : Michael C Johnson
Date : March 29 2020, 07:55 AM
Does that help If there are two POST /match requests, second request will wait until the first request is completed. However, if your post handler updates any global variables or object (e.g. cache), that change will be visible to other requests.
In your case randomPin.generate() will not have a race condition problem as there is no such thing as simultaneous execution in Node.js.
Simple Race Condition in Go HTTP Handler - Is this really a race condition?

Simple Race Condition in Go HTTP Handler - Is this really a race condition?


By : dna
Date : March 29 2020, 07:55 AM
With these it helps This is a data race, the race detector however does not report races that don't happen. You need to make sure that there are concurrent calls in your test, and ensuring GOMAXPROCS>1 can help flush them out as well.
Page redirect in jQuery fails randomly. Race condition?

Page redirect in jQuery fails randomly. Race condition?


By : user4491978
Date : March 29 2020, 07:55 AM
Hope that helps If your "#submit" element is actually submitting a form (e.g. it is an input of type "submit" within a form), that could cancel the page redirection. E.g. when no action is specified on the form, it just reloads the same page, preventing your modification of window.location.href from having any effect.
See also that post: javascript redirect not working anyway
Calling 'setState' of hook within context sequentially to store data resulting in race condition issues

Calling 'setState' of hook within context sequentially to store data resulting in race condition issues


By : user2997041
Date : March 29 2020, 07:55 AM
hop of those help? You can pass the function to setState callback:
code :
setState((state) => ({...state, [name]: data}))
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