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wireprotov2: implement commands as a generator of objects...
wireprotov2: implement commands as a generator of objects Previously, wire protocol version 2 inherited version 1's model of having separate types to represent the results of different wire protocol commands. As I implemented more powerful commands in future commits, I found I was using a common pattern of returning a special type to hold a generator. This meant the command function required a closure to do most of the work. That made logic flow more difficult to follow. I also noticed that many commands were effectively a sequence of objects to be CBOR encoded. I think it makes sense to define version 2 commands as generators. This way, commands can simply emit the data structures they wish to send to the client. This eliminates the need for a closure in command functions and removes encoding from the bodies of commands. As part of this commit, the handling of response objects has been moved into the serverreactor class. This puts the reactor in the driver's seat with regards to CBOR encoding and error handling. Having error handling in the function that emits frames is particularly important because exceptions in that function can lead to things getting in a bad state: I'm fairly certain that uncaught exceptions in the frame generator were causing deadlocks. I also introduced a dedicated error type for explicit error reporting in command handlers. This will be used in subsequent commits. There's still a bit of work to be done here, especially around formalizing the error handling "protocol." I've added yet another TODO to track this so we don't forget. Test output changed because we're using generators and no longer know we are at the end of the data until we hit the end of the generator. This means we can't emit the end-of-stream flag until we've exhausted the generator. Hence the introduction of 0-sized end-of-stream frames. Differential Revision: https://phab.mercurial-scm.org/D4472
Matt Harbison - - Load All Authors

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test-rebase-interruptions.t
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/ tests / test-rebase-interruptions.t
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$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
>
> [phases]
> publish=False
>
> [alias]
> tglog = log -G --template "{rev}: {node|short} '{desc}' {branches}\n"
> tglogp = log -G --template "{rev}: {node|short} {phase} '{desc}' {branches}\n"
> EOF
$ hg init a
$ cd a
$ echo A > A
$ hg ci -Am A
adding A
$ echo B > B
$ hg ci -Am B
adding B
$ echo C >> A
$ hg ci -m C
$ hg up -q -C 0
$ echo D >> A
$ hg ci -m D
created new head
$ echo E > E
$ hg ci -Am E
adding E
$ cd ..
Changes during an interruption - continue:
$ hg clone -q -u . a a1
$ cd a1
$ hg tglog
@ 4: ae36e8e3dfd7 'E'
|
o 3: 46b37eabc604 'D'
|
| o 2: 965c486023db 'C'
| |
| o 1: 27547f69f254 'B'
|/
o 0: 4a2df7238c3b 'A'
Rebasing B onto E:
$ hg rebase -s 1 -d 4
rebasing 1:27547f69f254 "B"
rebasing 2:965c486023db "C"
merging A
warning: conflicts while merging A! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
Force a commit on C during the interruption:
$ hg up -q -C 2 --config 'extensions.rebase=!'
$ echo 'Extra' > Extra
$ hg add Extra
$ hg ci -m 'Extra' --config 'extensions.rebase=!'
Force this commit onto secret phase
$ hg phase --force --secret 6
$ hg tglogp
@ 6: deb5d2f93d8b secret 'Extra'
|
| o 5: 45396c49d53b draft 'B'
| |
| o 4: ae36e8e3dfd7 draft 'E'
| |
| o 3: 46b37eabc604 draft 'D'
| |
o | 2: 965c486023db draft 'C'
| |
o | 1: 27547f69f254 draft 'B'
|/
o 0: 4a2df7238c3b draft 'A'
Resume the rebasing:
$ hg rebase --continue
already rebased 1:27547f69f254 "B" as 45396c49d53b
rebasing 2:965c486023db "C"
merging A
warning: conflicts while merging A! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
Solve the conflict and go on:
$ echo 'conflict solved' > A
$ rm A.orig
$ hg resolve -m A
(no more unresolved files)
continue: hg rebase --continue
$ hg rebase --continue
already rebased 1:27547f69f254 "B" as 45396c49d53b
rebasing 2:965c486023db "C"
warning: orphaned descendants detected, not stripping 27547f69f254, 965c486023db
$ hg tglogp
o 7: d2d25e26288e draft 'C'
|
| o 6: deb5d2f93d8b secret 'Extra'
| |
o | 5: 45396c49d53b draft 'B'
| |
@ | 4: ae36e8e3dfd7 draft 'E'
| |
o | 3: 46b37eabc604 draft 'D'
| |
| o 2: 965c486023db draft 'C'
| |
| o 1: 27547f69f254 draft 'B'
|/
o 0: 4a2df7238c3b draft 'A'
$ cd ..
Changes during an interruption - abort:
$ hg clone -q -u . a a2
$ cd a2
$ hg tglog
@ 4: ae36e8e3dfd7 'E'
|
o 3: 46b37eabc604 'D'
|
| o 2: 965c486023db 'C'
| |
| o 1: 27547f69f254 'B'
|/
o 0: 4a2df7238c3b 'A'
Rebasing B onto E:
$ hg rebase -s 1 -d 4
rebasing 1:27547f69f254 "B"
rebasing 2:965c486023db "C"
merging A
warning: conflicts while merging A! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
Force a commit on B' during the interruption:
$ hg up -q -C 5 --config 'extensions.rebase=!'
$ echo 'Extra' > Extra
$ hg add Extra
$ hg ci -m 'Extra' --config 'extensions.rebase=!'
$ hg tglog
@ 6: 402ee3642b59 'Extra'
|
o 5: 45396c49d53b 'B'
|
o 4: ae36e8e3dfd7 'E'
|
o 3: 46b37eabc604 'D'
|
| o 2: 965c486023db 'C'
| |
| o 1: 27547f69f254 'B'
|/
o 0: 4a2df7238c3b 'A'
Abort the rebasing:
$ hg rebase --abort
warning: new changesets detected on destination branch, can't strip
rebase aborted
$ hg tglog
@ 6: 402ee3642b59 'Extra'
|
o 5: 45396c49d53b 'B'
|
o 4: ae36e8e3dfd7 'E'
|
o 3: 46b37eabc604 'D'
|
| o 2: 965c486023db 'C'
| |
| o 1: 27547f69f254 'B'
|/
o 0: 4a2df7238c3b 'A'
$ cd ..
Changes during an interruption - abort (again):
$ hg clone -q -u . a a3
$ cd a3
$ hg tglogp
@ 4: ae36e8e3dfd7 draft 'E'
|
o 3: 46b37eabc604 draft 'D'
|
| o 2: 965c486023db draft 'C'
| |
| o 1: 27547f69f254 draft 'B'
|/
o 0: 4a2df7238c3b draft 'A'
Rebasing B onto E:
$ hg rebase -s 1 -d 4
rebasing 1:27547f69f254 "B"
rebasing 2:965c486023db "C"
merging A
warning: conflicts while merging A! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
Change phase on B and B'
$ hg up -q -C 5 --config 'extensions.rebase=!'
$ hg phase --public 1
$ hg phase --public 5
$ hg phase --secret -f 2
$ hg tglogp
@ 5: 45396c49d53b public 'B'
|
o 4: ae36e8e3dfd7 public 'E'
|
o 3: 46b37eabc604 public 'D'
|
| o 2: 965c486023db secret 'C'
| |
| o 1: 27547f69f254 public 'B'
|/
o 0: 4a2df7238c3b public 'A'
Abort the rebasing:
$ hg rebase --abort
warning: can't clean up public changesets 45396c49d53b
rebase aborted
$ hg tglogp
@ 5: 45396c49d53b public 'B'
|
o 4: ae36e8e3dfd7 public 'E'
|
o 3: 46b37eabc604 public 'D'
|
| o 2: 965c486023db secret 'C'
| |
| o 1: 27547f69f254 public 'B'
|/
o 0: 4a2df7238c3b public 'A'
Test rebase interrupted by hooks
$ hg up 2
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo F > F
$ hg add F
$ hg ci -m F
$ cd ..
(precommit version)
$ cp -R a3 hook-precommit
$ cd hook-precommit
$ hg rebase --source 2 --dest 5 --tool internal:other --config 'hooks.precommit=hg status | grep "M A"'
rebasing 2:965c486023db "C"
M A
rebasing 6:a0b2430ebfb8 "F" (tip)
abort: precommit hook exited with status 1
[255]
$ hg tglogp
@ 7: 401ccec5e39f secret 'C'
|
| @ 6: a0b2430ebfb8 secret 'F'
| |
o | 5: 45396c49d53b public 'B'
| |
o | 4: ae36e8e3dfd7 public 'E'
| |
o | 3: 46b37eabc604 public 'D'
| |
| o 2: 965c486023db secret 'C'
| |
| o 1: 27547f69f254 public 'B'
|/
o 0: 4a2df7238c3b public 'A'
$ hg rebase --continue
already rebased 2:965c486023db "C" as 401ccec5e39f
rebasing 6:a0b2430ebfb8 "F"
saved backup bundle to $TESTTMP/hook-precommit/.hg/strip-backup/965c486023db-aa6250e7-rebase.hg
$ hg tglogp
@ 6: 6e92a149ac6b secret 'F'
|
o 5: 401ccec5e39f secret 'C'
|
o 4: 45396c49d53b public 'B'
|
o 3: ae36e8e3dfd7 public 'E'
|
o 2: 46b37eabc604 public 'D'
|
| o 1: 27547f69f254 public 'B'
|/
o 0: 4a2df7238c3b public 'A'
$ cd ..
(pretxncommit version)
$ cp -R a3 hook-pretxncommit
$ cd hook-pretxncommit
$ hg rebase --source 2 --dest 5 --tool internal:other \
> --config 'hooks.tonative.pretxncommit=True' --config 'hooks.pretxncommit=hg log -r $HG_NODE | grep "summary: C"'
rebasing 2:965c486023db "C"
summary: C
rebasing 6:a0b2430ebfb8 "F" (tip)
transaction abort!
rollback completed
abort: pretxncommit hook exited with status 1
[255]
$ hg tglogp
@ 7: 401ccec5e39f secret 'C'
|
| @ 6: a0b2430ebfb8 secret 'F'
| |
o | 5: 45396c49d53b public 'B'
| |
o | 4: ae36e8e3dfd7 public 'E'
| |
o | 3: 46b37eabc604 public 'D'
| |
| o 2: 965c486023db secret 'C'
| |
| o 1: 27547f69f254 public 'B'
|/
o 0: 4a2df7238c3b public 'A'
$ hg rebase --continue
already rebased 2:965c486023db "C" as 401ccec5e39f
rebasing 6:a0b2430ebfb8 "F"
saved backup bundle to $TESTTMP/hook-pretxncommit/.hg/strip-backup/965c486023db-aa6250e7-rebase.hg
$ hg tglogp
@ 6: 6e92a149ac6b secret 'F'
|
o 5: 401ccec5e39f secret 'C'
|
o 4: 45396c49d53b public 'B'
|
o 3: ae36e8e3dfd7 public 'E'
|
o 2: 46b37eabc604 public 'D'
|
| o 1: 27547f69f254 public 'B'
|/
o 0: 4a2df7238c3b public 'A'
$ cd ..
(pretxnclose version)
$ cp -R a3 hook-pretxnclose
$ cd hook-pretxnclose
$ hg rebase --source 2 --dest 5 --tool internal:other --config 'hooks.pretxnclose=hg log -r tip | grep "summary: C"'
rebasing 2:965c486023db "C"
summary: C
rebasing 6:a0b2430ebfb8 "F" (tip)
transaction abort!
rollback completed
abort: pretxnclose hook exited with status 1
[255]
$ hg tglogp
@ 7: 401ccec5e39f secret 'C'
|
| @ 6: a0b2430ebfb8 secret 'F'
| |
o | 5: 45396c49d53b public 'B'
| |
o | 4: ae36e8e3dfd7 public 'E'
| |
o | 3: 46b37eabc604 public 'D'
| |
| o 2: 965c486023db secret 'C'
| |
| o 1: 27547f69f254 public 'B'
|/
o 0: 4a2df7238c3b public 'A'
$ hg rebase --continue
already rebased 2:965c486023db "C" as 401ccec5e39f
rebasing 6:a0b2430ebfb8 "F"
saved backup bundle to $TESTTMP/hook-pretxnclose/.hg/strip-backup/965c486023db-aa6250e7-rebase.hg
$ hg tglogp
@ 6: 6e92a149ac6b secret 'F'
|
o 5: 401ccec5e39f secret 'C'
|
o 4: 45396c49d53b public 'B'
|
o 3: ae36e8e3dfd7 public 'E'
|
o 2: 46b37eabc604 public 'D'
|
| o 1: 27547f69f254 public 'B'
|/
o 0: 4a2df7238c3b public 'A'
$ cd ..
Make sure merge state is cleaned up after a no-op rebase merge (issue5494)
$ hg init repo
$ cd repo
$ echo a > a
$ hg commit -qAm base
$ echo b >> a
$ hg commit -qm b
$ hg up '.^'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo c >> a
$ hg commit -qm c
$ hg rebase -s 1 -d 2 --noninteractive
rebasing 1:fdaca8533b86 "b"
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
$ echo a > a
$ echo c >> a
$ hg resolve --mark a
(no more unresolved files)
continue: hg rebase --continue
$ hg rebase --continue
rebasing 1:fdaca8533b86 "b"
note: rebase of 1:fdaca8533b86 created no changes to commit
saved backup bundle to $TESTTMP/repo/.hg/strip-backup/fdaca8533b86-7fd70513-rebase.hg
$ hg resolve --list
$ test -d .hg/merge
[1]
Now try again with --collapse
$ hg unbundle -q .hg/strip-backup/fdaca8533b86-7fd70513-rebase.hg
$ hg rebase -s 2 -d 1 --noninteractive --collapse
rebasing 2:fdaca8533b86 "b" (tip)
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
$ echo a > a
$ echo c >> a
$ hg resolve --mark a
(no more unresolved files)
continue: hg rebase --continue
$ hg rebase --continue
rebasing 2:fdaca8533b86 "b" (tip)
saved backup bundle to $TESTTMP/repo/.hg/strip-backup/fdaca8533b86-7fd70513-rebase.hg
$ hg resolve --list
$ test -d .hg/merge
[1]