wireproto: implement basic frame reading and processing
We just implemented support for writing frames. Now let's implement
support for reading them.
The bulk of the new code is for a class that maintains the state of
a server. Essentially, you construct an instance, feed frames to it,
and it tells you what you should do next. The design is inspired by
the "sans I/O" movement and the reactor pattern. We don't want to
perform I/O or any major blocking event during frame ingestion because
this arbitrarily limits ways that server pieces can be implemented.
For example, it makes it much harder to swap in an alternate
implementation based on asyncio or do crazy things like have requests
dispatch to other processes.
We do still implement readframe() which does I/O. But it is decoupled
from the server reactor. And important parsing of frame headers is
a standalone function. So I/O is only needed to obtain frame data.
Because testing server-side ingest is useful and difficult on running
servers, we create a new "debugreflect" endpoint that will echo back
to the client what was received and how it was interpreted. This could
be useful for a server admin, someone implementing a client. But
immediately, it is useful for testing: we're able to demonstrate that
frames are parsed correctly and turned into requests to run commands
without having to implement command dispatch on the server!
In addition, we implement Python level unit tests for the reactor.
This is vastly more efficient than sending requests to the
"debugreflect" endpoint and vastly more powerful for advanced
testing.
Differential Revision: https://phab.mercurial-scm.org/D2852
$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
> drawdag=$TESTDIR/drawdag.py
>
> [phases]
> publish=False
>
> [alias]
> tglog = log -G --template "{rev}: {node|short} '{desc}' bookmarks: {bookmarks}\n"
> EOF
Create a repo with several bookmarks
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Am A
adding a
$ echo b > b
$ hg ci -Am B
adding b
$ hg book 'X'
$ hg book 'Y'
$ echo c > c
$ hg ci -Am C
adding c
$ hg book 'Z'
$ hg up -q 0
$ echo d > d
$ hg ci -Am D
adding d
created new head
$ hg book W
$ hg tglog
@ 3: 41acb9dca9eb 'D' bookmarks: W
|
| o 2: 49cb3485fa0c 'C' bookmarks: Y Z
| |
| o 1: 6c81ed0049f8 'B' bookmarks: X
|/
o 0: 1994f17a630e 'A' bookmarks:
Move only rebased bookmarks
$ cd ..
$ hg clone -q a a1
$ cd a1
$ hg up -q Z
Test deleting divergent bookmarks from dest (issue3685)
$ hg book -r 3 Z@diverge
... and also test that bookmarks not on dest or not being moved aren't deleted
$ hg book -r 3 X@diverge
$ hg book -r 0 Y@diverge
$ hg tglog
o 3: 41acb9dca9eb 'D' bookmarks: W X@diverge Z@diverge
|
| @ 2: 49cb3485fa0c 'C' bookmarks: Y Z
| |
| o 1: 6c81ed0049f8 'B' bookmarks: X
|/
o 0: 1994f17a630e 'A' bookmarks: Y@diverge
$ hg rebase -s Y -d 3
rebasing 2:49cb3485fa0c "C" (Y Z)
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/49cb3485fa0c-126f3e97-rebase.hg
$ hg tglog
@ 3: 17fb3faba63c 'C' bookmarks: Y Z
|
o 2: 41acb9dca9eb 'D' bookmarks: W X@diverge
|
| o 1: 6c81ed0049f8 'B' bookmarks: X
|/
o 0: 1994f17a630e 'A' bookmarks: Y@diverge
Do not try to keep active but deleted divergent bookmark
$ cd ..
$ hg clone -q a a4
$ cd a4
$ hg up -q 2
$ hg book W@diverge
$ hg rebase -s W -d .
rebasing 3:41acb9dca9eb "D" (W tip)
saved backup bundle to $TESTTMP/a4/.hg/strip-backup/41acb9dca9eb-b35a6a63-rebase.hg
$ hg bookmarks
W 3:0d3554f74897
X 1:6c81ed0049f8
Y 2:49cb3485fa0c
Z 2:49cb3485fa0c
Keep bookmarks to the correct rebased changeset
$ cd ..
$ hg clone -q a a2
$ cd a2
$ hg up -q Z
$ hg rebase -s 1 -d 3
rebasing 1:6c81ed0049f8 "B" (X)
rebasing 2:49cb3485fa0c "C" (Y Z)
saved backup bundle to $TESTTMP/a2/.hg/strip-backup/6c81ed0049f8-a687065f-rebase.hg
$ hg tglog
@ 3: 3d5fa227f4b5 'C' bookmarks: Y Z
|
o 2: e926fccfa8ec 'B' bookmarks: X
|
o 1: 41acb9dca9eb 'D' bookmarks: W
|
o 0: 1994f17a630e 'A' bookmarks:
Keep active bookmark on the correct changeset
$ cd ..
$ hg clone -q a a3
$ cd a3
$ hg up -q X
$ hg rebase -d W
rebasing 1:6c81ed0049f8 "B" (X)
rebasing 2:49cb3485fa0c "C" (Y Z)
saved backup bundle to $TESTTMP/a3/.hg/strip-backup/6c81ed0049f8-a687065f-rebase.hg
$ hg tglog
o 3: 3d5fa227f4b5 'C' bookmarks: Y Z
|
@ 2: e926fccfa8ec 'B' bookmarks: X
|
o 1: 41acb9dca9eb 'D' bookmarks: W
|
o 0: 1994f17a630e 'A' bookmarks:
$ hg bookmarks
W 1:41acb9dca9eb
* X 2:e926fccfa8ec
Y 3:3d5fa227f4b5
Z 3:3d5fa227f4b5
rebase --continue with bookmarks present (issue3802)
$ hg up 2
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(leaving bookmark X)
$ echo 'C' > c
$ hg add c
$ hg ci -m 'other C'
created new head
$ hg up 3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg rebase --dest 4
rebasing 3:3d5fa227f4b5 "C" (Y Z)
merging c
warning: conflicts while merging c! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
$ echo 'c' > c
$ hg resolve --mark c
(no more unresolved files)
continue: hg rebase --continue
$ hg rebase --continue
rebasing 3:3d5fa227f4b5 "C" (Y Z)
saved backup bundle to $TESTTMP/a3/.hg/strip-backup/3d5fa227f4b5-c6ea2371-rebase.hg
$ hg tglog
@ 4: 45c0f0ec1203 'C' bookmarks: Y Z
|
o 3: b0e10b7175fd 'other C' bookmarks:
|
o 2: e926fccfa8ec 'B' bookmarks: X
|
o 1: 41acb9dca9eb 'D' bookmarks: W
|
o 0: 1994f17a630e 'A' bookmarks:
ensure that bookmarks given the names of revset functions can be used
as --rev arguments (issue3950)
$ hg update -q 3
$ echo bimble > bimble
$ hg add bimble
$ hg commit -q -m 'bisect'
$ echo e >> bimble
$ hg ci -m bisect2
$ echo e >> bimble
$ hg ci -m bisect3
$ hg book bisect
$ hg update -q Y
$ hg rebase -r '"bisect"^^::"bisect"^' -r bisect -d Z
rebasing 5:345c90f326a4 "bisect"
rebasing 6:f677a2907404 "bisect2"
rebasing 7:325c16001345 "bisect3" (bisect tip)
saved backup bundle to $TESTTMP/a3/.hg/strip-backup/345c90f326a4-b4840586-rebase.hg
Bookmark and working parent get moved even if --keep is set (issue5682)
$ hg init $TESTTMP/book-keep
$ cd $TESTTMP/book-keep
$ hg debugdrawdag <<'EOS'
> B C
> |/
> A
> EOS
$ eval `hg tags -T 'hg bookmark -ir {node} {tag};\n' | grep -v tip`
$ rm .hg/localtags
$ hg up -q B
$ hg tglog
o 2: dc0947a82db8 'C' bookmarks: C
|
| @ 1: 112478962961 'B' bookmarks: B
|/
o 0: 426bada5c675 'A' bookmarks: A
$ hg rebase -r B -d C --keep
rebasing 1:112478962961 "B" (B)
$ hg tglog
@ 3: 9769fc65c4c5 'B' bookmarks: B
|
o 2: dc0947a82db8 'C' bookmarks: C
|
| o 1: 112478962961 'B' bookmarks:
|/
o 0: 426bada5c675 'A' bookmarks: A