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epriestley 13c8963dab Fix a Mercurial wire protocol parser issue when we receive a length frame before any data
Summary:
Depends on D18856. Ref T13036. See PHI275. When we receive a length frame but the buffer doesn't have any data yet, we currently emit a pointless 0-length data frame on the channel.

For normal chatter this is harmless/valid, but it causes problems when a channel has transitioned into bundle2 mode (probably it indicates "end of stream")?

In any case, it's never helpful, so if we're about to read a data block and don't have any data, just bail out until we see some more data.

Note that we can't end up here //expecting// a 0-length data block: both the `data-length` and `data-bytes` states already handle that properly.

Test Plan: Pushed 4MB changes to a Mercurial repository with Mercurial 4.1.1, was no longer able to hit channel errors.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13036

Differential Revision: https://secure.phabricator.com/D18857
2018-01-04 14:06:52 -08:00
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resources Allow Herald rules to add comments 2017-12-18 09:10:57 -08:00
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src Fix a Mercurial wire protocol parser issue when we receive a length frame before any data 2018-01-04 14:06:52 -08:00
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webroot Allow Herald rules to add comments 2017-12-18 09:10:57 -08:00
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.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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