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https://issues.apache.org/jira/browse/TS-4523?focusedWorklogId=26526&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-26526
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ASF GitHub Bot logged work on TS-4523:
--------------------------------------
Author: ASF GitHub Bot
Created on: 16/Aug/16 22:02
Start Date: 16/Aug/16 22:02
Worklog Time Spent: 10m
Work Description: Github user ushachar commented on the issue:
https://github.com/apache/trafficserver/pull/712
The reason for wanting this feature is to support prolonged content related
actions -- in @davidbz case out-of-process content malware analysis.
When acting as a forward proxy and handling a request for a very large
file, he needs to support an initial analysis on the first N MBs of the file in
order to decide if he must analyze the full file or can release it to the
client.
This analysis can take a significant amount of time and continuing to
buffer the contents can lead to resource exhaustion.
(When combined with turning on flow control to make sure that we throttle
the proxy<->upstream tcp connection)
@bgaff - I know you had some concerns regarding this - does this use case
seem reasonable to you?
Issue Time Tracking
-------------------
Worklog Id: (was: 26526)
Time Spent: 0.5h (was: 20m)
> Add the ability to pause/resume data consumption in the CPP API
> ---------------------------------------------------------------
>
> Key: TS-4523
> URL: https://issues.apache.org/jira/browse/TS-4523
> Project: Traffic Server
> Issue Type: Improvement
> Components: Plugins
> Reporter: David Ben Zakai
> Assignee: Uri Shachar
> Fix For: 7.0.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> I'd like to suggest an API change in the CPP API Transformation interface.
> My own use case is that I'd like to be able to pause the transformation,
> handle what I can from the file and release the buffered content before
> resuming and releasing the rest of the data.
> Basically what I'm trying to achieve:
> Write data to file (up to a certain amount)
> File analysis
> Produce file data (and any leftovers) downstream
> When the file size reaches a certain size limit I'd like to be able to pause
> the transformation and produce all of its content downstream and then resume
> the transformation.
> API Changes:
> TransformationPlugin.h:
> /**
> * Call this method if you wish to pause the transformation.
> * Schedule the return value continuation to resume the transforamtion.
> * If the continuation is scheduled and called after the transform is
> destroyed it will
> * won't do anything beyond cleanups.
> * Note: You must schedule the continuation or destroy it (using
> TSContDestroy) yourself,
> * otherwise it will leak.
> */
> TSCont pause();
> Internally, the continuation wraps the "resumeCallback" static function:
> static int resumeCallback(TSCont cont, TSEvent event, void *edata); /**
> Resume callback*/
> Thank you!
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