Mercurial > hg
view tests/test-pathconflicts-basic.t @ 39561:d06834e0f48e
wireprotov2peer: stream decoded responses
Previously, wire protocol version 2 would buffer all response data.
Only once all data was received did we CBOR decode it and resolve
the future associated with the command. This was obviously not
desirable. In future commits that introduce large response payloads,
this caused significant memory bloat and slowed down client
operations due to waiting on the server.
This commit refactors the response handling code so that response
data can be streamed.
Command response objects now contain a buffered CBOR decoder. As
new data arrives, it is fed into the decoder. Decoded objects are
made available to the generator as they are decoded.
Because there is a separate thread processing incoming frames and
feeding data into the response object, there is the potential for
race conditions when mutating response objects. So a lock has been
added to guard access to critical state variables.
Because the generator emitting decoded objects needs to wait on
those objects to become available, we've added an Event for the
generator to wait on so it doesn't busy loop. This does mean
there is the potential for deadlocks. And I'm pretty sure they can
occur in some scenarios. We already have a handful of TODOs around
this. But I've added some more. Fixing this will likely require
moving the background thread receiving frames into clienthandler.
We likely would have done this anyway when implementing the client
bits for the SSH transport.
Test output changes because the initial CBOR map holding the overall
response state is now always handled internally by the response
object.
Differential Revision: https://phab.mercurial-scm.org/D4474
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Wed, 29 Aug 2018 15:17:11 -0700 |
parents | 41ef02ba329b |
children | 0b46e1aa7760 |
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Path conflict checking is currently disabled by default because of issue5716. Turn it on for this test. $ cat >> $HGRCPATH << EOF > [experimental] > merge.checkpathconflicts=True > EOF $ hg init repo $ cd repo $ echo base > base $ hg add base $ hg commit -m "base" $ hg bookmark -i base $ echo 1 > a $ hg add a $ hg commit -m "file" $ hg bookmark -i file $ echo 2 > a $ hg commit -m "file2" $ hg bookmark -i file2 $ hg up -q 0 $ mkdir a $ echo 2 > a/b $ hg add a/b $ hg commit -m "dir" created new head $ hg bookmark -i dir Basic merge - local file conflicts with remote directory $ hg up -q file $ hg bookmark -i $ hg merge --verbose dir resolving manifests a: path conflict - a file or link has the same name as a directory the local file has been renamed to a~853701544ac3 resolve manually then use 'hg resolve --mark a' moving a to a~853701544ac3 getting a/b 1 files updated, 0 files merged, 0 files removed, 1 files unresolved use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon [1] $ hg update --clean . 1 files updated, 0 files merged, 1 files removed, 0 files unresolved $ rm a~853701544ac3 Basic update - local directory conflicts with remote file $ hg up -q 0 $ mkdir a $ echo 3 > a/b $ hg up file a: untracked directory conflicts with file abort: untracked files in working directory differ from files in requested revision [255] $ hg up --clean file 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (activating bookmark file) Repo state is ok $ hg sum parent: 1:853701544ac3 file branch: default bookmarks: *file commit: (clean) update: 2 new changesets (update) phases: 4 draft Basic update - untracked file conflicts with remote directory $ hg up -q 0 $ echo untracked > a $ hg up --config merge.checkunknown=warn dir a: replacing untracked file 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (activating bookmark dir) $ cat a.orig untracked $ rm -f a.orig Basic clean update - local directory conflicts with changed remote file $ hg up -q file $ rm a $ mkdir a $ echo 4 > a/b $ hg up file2 abort: *: '$TESTTMP/repo/a' (glob) [255] $ hg up --clean file2 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (activating bookmark file2) Repo state is ok $ hg sum parent: 2:f64e09fac717 file2 branch: default bookmarks: *file2 commit: (clean) update: 1 new changesets, 2 branch heads (merge) phases: 4 draft