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view tests/test-mailmap.t @ 37631:2f626233859b
wireproto: implement batching on peer executor interface
This is a bit more complicated than non-batch requests because we
need to buffer sends until the last request arrives *and* we need
to support resolving futures as data arrives from the remote.
In a classical concurrent.futures executor model, the future
"starts" as soon as it is submitted. However, we have nothing to
start until the last command is submitted.
If we did nothing, calling result() would deadlock, since the future
hasn't "started." So in the case where we queue the command, we return
a special future type whose result() will trigger sendcommands().
This eliminates the deadlock potential. It also serves as a check
against callers who may be calling result() prematurely, as it will
prevent any subsequent callcommands() from working. This behavior
is slightly annoying and a bit restrictive. But it's the world
that half duplex connections forces on us.
In order to support streaming responses, we were previously using
a generator. But with a futures-based API, we're using futures
and not generators. So in order to get streaming, we need a
background thread to read data from the server.
The approach taken in this patch is to leverage the ThreadPoolExecutor
from concurrent.futures for managing a background thread. We create
an executor and future that resolves when all response data is
processed (or an error occurs). When exiting the context manager,
we wait on that background reading before returning.
I was hoping we could manually spin up a threading.Thread and this
would be simple. But I ran into a few deadlocks when implementing.
After looking at the source code to concurrent.futures, I figured
it would just be easier to use a ThreadPoolExecutor than implement
all the code needed to manually manage a thread.
To prove this works, a use of the batch API in discovery has been
updated.
Differential Revision: https://phab.mercurial-scm.org/D3269
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 13 Apr 2018 11:02:34 -0700 |
parents | 8e57c3b0dce4 |
children |
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Create a repo and add some commits $ hg init mm $ cd mm $ echo "Test content" > testfile1 $ hg add testfile1 $ hg commit -m "First commit" -u "Proper <commit@m.c>" $ echo "Test content 2" > testfile2 $ hg add testfile2 $ hg commit -m "Second commit" -u "Commit Name 2 <commit2@m.c>" $ echo "Test content 3" > testfile3 $ hg add testfile3 $ hg commit -m "Third commit" -u "Commit Name 3 <commit3@m.c>" $ echo "Test content 4" > testfile4 $ hg add testfile4 $ hg commit -m "Fourth commit" -u "Commit Name 4 <commit4@m.c>" Add a .mailmap file with each possible entry type plus comments $ cat > .mailmap << EOF > # Comment shouldn't break anything > <proper@m.c> <commit@m.c> # Should update email only > Proper Name 2 <commit2@m.c> # Should update name only > Proper Name 3 <proper@m.c> <commit3@m.c> # Should update name, email due to email > Proper Name 4 <proper@m.c> Commit Name 4 <commit4@m.c> # Should update name, email due to name, email > EOF $ hg add .mailmap $ hg commit -m "Add mailmap file" -u "Testuser <test123@m.c>" Output of commits should be normal without filter $ hg log -T "{author}\n" -r "all()" Proper <commit@m.c> Commit Name 2 <commit2@m.c> Commit Name 3 <commit3@m.c> Commit Name 4 <commit4@m.c> Testuser <test123@m.c> Output of commits with filter shows their mailmap values $ hg log -T "{mailmap(author)}\n" -r "all()" Proper <proper@m.c> Proper Name 2 <commit2@m.c> Proper Name 3 <proper@m.c> Proper Name 4 <proper@m.c> Testuser <test123@m.c> Add new mailmap entry for testuser $ cat >> .mailmap << EOF > <newmmentry@m.c> <test123@m.c> > EOF Output of commits with filter shows their updated mailmap values $ hg log -T "{mailmap(author)}\n" -r "all()" Proper <proper@m.c> Proper Name 2 <commit2@m.c> Proper Name 3 <proper@m.c> Proper Name 4 <proper@m.c> Testuser <newmmentry@m.c> A commit with improperly formatted user field should not break the filter $ echo "some more test content" > testfile1 $ hg commit -m "Commit with improper user field" -u "Improper user" $ hg log -T "{mailmap(author)}\n" -r "all()" Proper <proper@m.c> Proper Name 2 <commit2@m.c> Proper Name 3 <proper@m.c> Proper Name 4 <proper@m.c> Testuser <newmmentry@m.c> Improper user No TypeError beacause of invalid input $ hg log -T '{mailmap(termwidth)}\n' -r0 80