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GuyG's avatar
GuyG
Icon for Altocumulus rankAltocumulus
Dec 06, 2023

Reading chunked data in iRule

Hey, I have an iRule in which I read all the payloads in each request and response. When there iRule receives chunked data, because there is no content-length I just use some big number as a limit...
devops
GuyG's avatar
GuyG
Icon for Altocumulus rankAltocumulus
Splitting my reply to a few messages, because it didn't let me reply saying I was "Post Flooding".
Thanks for the reply.
This is sort of what I'm trying to do.
I have a simple iRule to start with where I'm trying to log the whole payload (all chunks combined) at the end of the response, while allowing the VS to send each chunk back to the client instead of buffering it.
GuyG's avatar
GuyG
Icon for Altocumulus rankAltocumulus
Dec 13, 2023
when HTTP_RESPONSE {
    log local0.debug "Start of HTTP_RESPONSE"
    set readSoFar 0
    catch { HTTP::collect 1 }
}

when HTTP_RESPONSE_DATA {
    log local0.debug "Start of HTTP_RESPONSE_DATA"

    set prev_readSoFar $readSoFar
    set readSoFar [HTTP::payload length]
    log local0.debug "readSoFar: |$readSoFar|, prev_readSoFar: |$prev_readSoFar|"
    
    if { $readSoFar == $prev_readSoFar } {
        log local0.debug "Whole body: |[HTTP::payload]|"
    } else {
        HTTP::release

        catch { HTTP::collect [expr {$readSoFar + 1}] }
    }
}

when HTTP_RESPONSE_RELEASE {
    log local0.debug "Start of HTTP_RESPONSE_RELEASE"
}
  • GuyG's avatar
    GuyG
    Icon for Altocumulus rankAltocumulus
    Dec 13, 2023
    I tried using HTTP::release to allow the VS to send each chunk to the client, then called HTTP::collect again to collect the next chunk, the iRule will stop calling collect when it stopped receiving chunks (that's the job of the if).
    But when I do this, HTTP_RESPONSE_RELEASE is only triggered once at the very end of the iRule, and it seems like it isn't triggered when I call HTTP::release.
    • GuyG's avatar
      GuyG
      Icon for Altocumulus rankAltocumulus
      Dec 13, 2023
      Logs:
Rule /Common/xxxxx <HTTP_RESPONSE>: Start of HTTP_RESPONSE
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |6|, prev_readSoFar: |0|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |17|, prev_readSoFar: |6|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |43|, prev_readSoFar: |17|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |74|, prev_readSoFar: |43|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |116|, prev_readSoFar: |74|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |167|, prev_readSoFar: |116|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |183|, prev_readSoFar: |167|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |207|, prev_readSoFar: |183|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |686|, prev_readSoFar: |207|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |701|, prev_readSoFar: |686|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |712|, prev_readSoFar: |701|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |722|, prev_readSoFar: |712|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |727|, prev_readSoFar: |722|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Start of HTTP_RESPONSE_DATA
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: readSoFar: |727|, prev_readSoFar: |727|
Rule /Common/xxxxx <HTTP_RESPONSE_DATA>: Whole body: |1     6      {   14          "Status": {   19              "Code": "0",   24              "Desc": "交易成功",   2d              "TrxTime": "2023-12-05 03:04:01"   b          },   12          "Body": {   1d8              "key": "sajlfjsadfljsaflkajnvakvlsdkafnslkfnsdknfsalknvaslknfsajlfjsadfljsaflkajnvakvlsdkafnslkfnsdknfsalknvaslknfsajlfjsadfljsaflkajnvakvlsdkafnslkfnsdknfsalknvaslknfsajlfjsadfljsaflkajnvakvlsdkafnslkfnsdknfsalknvaslknfsajlfjsadfljsaflkajnvakvlsdkafnslkfnsdknfsalknvaslknfsajlfjsadfljsaflkajnvakvlsdkafnslkfnsdknfsalknvaslknfsajlfjsadfljsaflkajnvakvlsdkafnslkfnsdknfsalknvaslknfsajlfjsadfljsaflkajnvakvlsdkafnslkfnsdknfsalknvaslknfsajlfjsadfljsaflkajnvakvls"   a          }   6      }   5         0    |
Rule /Common/xxxxx <HTTP_RESPONSE_RELEASE>: Start of HTTP_RESPONSE_RELEASE
      • GuyG's avatar
        GuyG
        Icon for Altocumulus rankAltocumulus
        Dec 13, 2023
        Any idea why it seems like HTTP::release is not working? Did I misunderstand how to use it?