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Item7715: viewfile not to read the entire file content into memory when rev is not specified

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AppliesTo: Component: Priority: CurrentState: WaitingFor: TargetRelease ReleasedIn
Engine   Normal Closed   patch 6.1.0

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Applies To:
Current State:
Waiting For:
Target Release:
Released In:


When the latest revision of an attachment is retrieved, if TWiki::Store::getAttachmentStream() is used in TWiki::UI::View::viewfile(), we can avoid reading the entire file content into memory. TWiki::Engine::finalizeBody() is basically fine but the buffer size should be 8k reather than 4k. TWiki::Response::body() doesn't assume a file handle as its argument, hence needs a slight enhancement. Overall, 20 lines or so of code change achive the goal.

This is really helpful when viewfile needs to handle a file of the gigabyte range. You probably don't allow such a large file to be attached, but it can be generated by TWiki:Plugins/PublishContrib (if it's configured to put published files in an attachment area) or other plugins.

-- TWiki:Main/HideyoImazu - 2016-01-17

Summary viewfile not to read the entire file content into memory when rev is not specified
ReportedBy TWiki:Main.HideyoImazu
Codebase ~twiki4, 6.0.2
SVN Range TWiki-6.0.2-trunk, Sun, 10 Jan 2016, build 29797
AppliesTo Engine

Priority Normal
CurrentState Closed

Checkins TWikirev:29907 TWikirev:29908
TargetRelease patch
ReleasedIn 6.1.0
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Topic revision: r7 - 2018-07-17 - PeterThoeny
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