Detecting/limiting connections in the developer edition ...
This WebDNA talk-list message is from 2004
It keeps the original formatting.
numero = 59917
interpreted = N
texte = I'm using webdna developer edition on a WinXP computer on my LAN, and I need a way to determine how many connections are currently open at any moment in time. Once I have this information I can use it in my webdna script to prevent webdna from opening any new connections if the engine has already reached its connection limit. No one is browsing manually so I do not have to deal with incoming connections. I am in fact using this computer to run a webdna script that performs a series of OUTGOING tcpconnects -- and these are the connections I need to limit. I need to insure that the number of these connections does not go beyond webdna's built-in connection limit, because every time this happens it 'freezes' webdna and prevents any more connections until I restart the entire server. Yes, that's right, I must restart the entire server in order to make webdna useful again after it reaches its connection limit and stops responding to new requests. Not only that, but when webdna stops serving when it reaches its connection limit, I have to manually quit one or more processes before I can get it working again. I cannot simply go to the START menu and ask the computer to restart because it never works unless I also click a button in a dialog box that pops up and waits for me to confirm that I want to force quit some other process that apparently conflicts with webdna when it stops serving new connections. It would be really nice if webdna did not throw the OS into a condition that forces me to manually quit a process on the server before the server will restart and become functional again. But I can avoid this problem *if* webdna itself would report the current number of connections. Because if it can do this, I can use the connection number it reports to prevent any new connections when webdna's limit has already been reached. So tell me, is there any way to determine the current number of connections? Perhaps something like a [connections] tag that is undocumented but that actually exists and can be used to tell me how many connections are actually open at any given moment? Or does this capability simply not exist in the current version of webdna? I have already tried using [waitforfile] to slow down the number of connections webdna will open, and it actually slows down the rate at which new connections are opened to one every 15 seconds -- not the default 30 seconds that is claimed in the docs, so the docs should be changed to reflect this fact. Nevertheless this does NOT prevent too many new connections from being opened, because previously opened connections can still remain open ... so it does not resolve the problem I described here. What would be really nice, and extremely useful in this situation, would be for webdna's tcpconnect context to have a tag that reports whether or not each connection has actually been closed. This would allow us to track each connection and determine whether or not it is still open at any instant in time. By counting the number of connections that have been opened and also closed, we could prevent too many new connections from being opened ... Or even better would be a way to force-close a connection after a pre-determined amount of time, or before the next tcpconnect is opened. This would allow us to control the flow of our webdna scripts so that they would not try to open new connections unless webdna had not already reached its connection limit. Any thoughts or comments on this topic are very much appreciated, especially of you are offering a possible solution to the problem -- other than a suggestion to "buy an upgrade" -- which is an obvious solution that is unacceptable in this situation. Thanks. -- Sincerely, Kenneth Grome www.kengrome.com ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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I'm using webdna developer edition on a WinXP computer on my LAN, and I need a way to determine how many connections are currently open at any moment in time. Once I have this information I can use it in my webdna script to prevent webdna from opening any new connections if the engine has already reached its connection limit. No one is browsing manually so I do not have to deal with incoming connections. I am in fact using this computer to run a webdna script that performs a series of OUTGOING tcpconnects -- and these are the connections I need to limit. I need to insure that the number of these connections does not go beyond webdna's built-in connection limit, because every time this happens it 'freezes' webdna and prevents any more connections until I restart the entire server. Yes, that's right, I must restart the entire server in order to make webdna useful again after it reaches its connection limit and stops responding to new requests. Not only that, but when webdna stops serving when it reaches its connection limit, I have to manually quit one or more processes before I can get it working again. I cannot simply go to the START menu and ask the computer to restart because it never works unless I also click a button in a dialog box that pops up and waits for me to confirm that I want to force quit some other process that apparently conflicts with webdna when it stops serving new connections. It would be really nice if webdna did not throw the OS into a condition that forces me to manually quit a process on the server before the server will restart and become functional again. But I can avoid this problem *if* webdna itself would report the current number of connections. Because if it can do this, I can use the connection number it reports to prevent any new connections when webdna's limit has already been reached. So tell me, is there any way to determine the current number of connections? Perhaps something like a [connections] tag that is undocumented but that actually exists and can be used to tell me how many connections are actually open at any given moment? Or does this capability simply not exist in the current version of webdna? I have already tried using [waitforfile] to slow down the number of connections webdna will open, and it actually slows down the rate at which new connections are opened to one every 15 seconds -- not the default 30 seconds that is claimed in the docs, so the docs should be changed to reflect this fact. Nevertheless this does NOT prevent too many new connections from being opened, because previously opened connections can still remain open ... so it does not resolve the problem I described here. What would be really nice, and extremely useful in this situation, would be for webdna's tcpconnect context to have a tag that reports whether or not each connection has actually been closed. This would allow us to track each connection and determine whether or not it is still open at any instant in time. By counting the number of connections that have been opened and also closed, we could prevent too many new connections from being opened ... Or even better would be a way to force-close a connection after a pre-determined amount of time, or before the next tcpconnect is opened. This would allow us to control the flow of our webdna scripts so that they would not try to open new connections unless webdna had not already reached its connection limit. Any thoughts or comments on this topic are very much appreciated, especially of you are offering a possible solution to the problem -- other than a suggestion to "buy an upgrade" -- which is an obvious solution that is unacceptable in this situation. Thanks. -- Sincerely, Kenneth Grome www.kengrome.com ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Kenneth Grome
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