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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
Boris Feld - - Load All Authors

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test-rebase-named-branches.t
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/ tests / test-rebase-named-branches.t
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$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
>
> [phases]
> publish=False
>
> [alias]
> tglog = log -G --template "{rev}: {node|short} '{desc}' {branches}\n"
> EOF
$ hg init a
$ cd a
$ hg unbundle "$TESTDIR/bundles/rebase.hg"
adding changesets
adding manifests
adding file changes
added 8 changesets with 7 changes to 7 files (+2 heads)
new changesets cd010b8cd998:02de42196ebe (8 drafts)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg up tip
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd ..
$ hg clone -q -u . a a1
$ cd a1
$ hg update 3
3 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ hg branch dev-one
marked working directory as branch dev-one
(branches are permanent and global, did you want a bookmark?)
$ hg ci -m 'dev-one named branch'
$ hg update 7
2 files updated, 0 files merged, 3 files removed, 0 files unresolved
$ hg branch dev-two
marked working directory as branch dev-two
$ echo x > x
$ hg add x
$ hg ci -m 'dev-two named branch'
$ hg tglog
@ 9: cb039b7cae8e 'dev-two named branch' dev-two
|
| o 8: 643fc9128048 'dev-one named branch' dev-one
| |
o | 7: 02de42196ebe 'H'
| |
+---o 6: eea13746799a 'G'
| | |
o | | 5: 24b6387c8c8c 'F'
| | |
+---o 4: 9520eea781bc 'E'
| |
| o 3: 32af7686d403 'D'
| |
| o 2: 5fddd98957c8 'C'
| |
| o 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
Branch name containing a dash (issue3181)
$ hg rebase -b dev-two -d dev-one --keepbranches
rebasing 5:24b6387c8c8c "F"
rebasing 6:eea13746799a "G"
rebasing 7:02de42196ebe "H"
rebasing 9:cb039b7cae8e "dev-two named branch" (tip)
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/24b6387c8c8c-24cb8001-rebase.hg
$ hg tglog
@ 9: 9e70cd31750f 'dev-two named branch' dev-two
|
o 8: 31d0e4ba75e6 'H'
|
| o 7: 4b988a958030 'G'
|/|
o | 6: 24de4aff8e28 'F'
| |
o | 5: 643fc9128048 'dev-one named branch' dev-one
| |
| o 4: 9520eea781bc 'E'
| |
o | 3: 32af7686d403 'D'
| |
o | 2: 5fddd98957c8 'C'
| |
o | 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ hg rebase -s dev-one -d 0 --keepbranches
rebasing 5:643fc9128048 "dev-one named branch"
rebasing 6:24de4aff8e28 "F"
rebasing 7:4b988a958030 "G"
rebasing 8:31d0e4ba75e6 "H"
rebasing 9:9e70cd31750f "dev-two named branch" (tip)
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/643fc9128048-c4ee9ef5-rebase.hg
$ hg tglog
@ 9: 59c2e59309fe 'dev-two named branch' dev-two
|
o 8: 904590360559 'H'
|
| o 7: 1a1e6f72ec38 'G'
|/|
o | 6: 42aa3cf0fa7a 'F'
| |
o | 5: bc8139ee757c 'dev-one named branch' dev-one
| |
| o 4: 9520eea781bc 'E'
|/
| o 3: 32af7686d403 'D'
| |
| o 2: 5fddd98957c8 'C'
| |
| o 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ hg update 3
3 files updated, 0 files merged, 3 files removed, 0 files unresolved
$ hg branch -f dev-one
marked working directory as branch dev-one
$ hg ci -m 'dev-one named branch'
created new head
$ hg tglog
@ 10: 643fc9128048 'dev-one named branch' dev-one
|
| o 9: 59c2e59309fe 'dev-two named branch' dev-two
| |
| o 8: 904590360559 'H'
| |
| | o 7: 1a1e6f72ec38 'G'
| |/|
| o | 6: 42aa3cf0fa7a 'F'
| | |
| o | 5: bc8139ee757c 'dev-one named branch' dev-one
| | |
| | o 4: 9520eea781bc 'E'
| |/
o | 3: 32af7686d403 'D'
| |
o | 2: 5fddd98957c8 'C'
| |
o | 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ hg rebase -b 'max(branch("dev-two"))' -d dev-one --keepbranches
rebasing 5:bc8139ee757c "dev-one named branch"
note: rebase of 5:bc8139ee757c created no changes to commit
rebasing 6:42aa3cf0fa7a "F"
rebasing 7:1a1e6f72ec38 "G"
rebasing 8:904590360559 "H"
rebasing 9:59c2e59309fe "dev-two named branch"
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/bc8139ee757c-f11c1080-rebase.hg
$ hg tglog
o 9: 71325f8bc082 'dev-two named branch' dev-two
|
o 8: 12b2bc666e20 'H'
|
| o 7: 549f007a9f5f 'G'
|/|
o | 6: 679f28760620 'F'
| |
@ | 5: 643fc9128048 'dev-one named branch' dev-one
| |
| o 4: 9520eea781bc 'E'
| |
o | 3: 32af7686d403 'D'
| |
o | 2: 5fddd98957c8 'C'
| |
o | 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ hg rebase -s 'max(branch("dev-one"))' -d 0 --keepbranches
rebasing 5:643fc9128048 "dev-one named branch"
rebasing 6:679f28760620 "F"
rebasing 7:549f007a9f5f "G"
rebasing 8:12b2bc666e20 "H"
rebasing 9:71325f8bc082 "dev-two named branch" (tip)
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/643fc9128048-6cdd1a52-rebase.hg
$ hg tglog
o 9: 3944801ae4ea 'dev-two named branch' dev-two
|
o 8: 8e279d293175 'H'
|
| o 7: aeefee77ab01 'G'
|/|
o | 6: e908b85f3729 'F'
| |
@ | 5: bc8139ee757c 'dev-one named branch' dev-one
| |
| o 4: 9520eea781bc 'E'
|/
| o 3: 32af7686d403 'D'
| |
| o 2: 5fddd98957c8 'C'
| |
| o 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ hg up -r 0 > /dev/null
Rebasing descendant onto ancestor across different named branches
$ hg rebase -s 1 -d 9 --keepbranches
rebasing 1:42ccdea3bb16 "B"
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/42ccdea3bb16-3cb021d3-rebase.hg
$ hg tglog
o 9: e9f862ce8bad 'D'
|
o 8: a0d543090fa4 'C'
|
o 7: 3bdb949809d9 'B'
|
o 6: 3944801ae4ea 'dev-two named branch' dev-two
|
o 5: 8e279d293175 'H'
|
| o 4: aeefee77ab01 'G'
|/|
o | 3: e908b85f3729 'F'
| |
o | 2: bc8139ee757c 'dev-one named branch' dev-one
| |
| o 1: 9520eea781bc 'E'
|/
@ 0: cd010b8cd998 'A'
$ hg rebase -s 5 -d 6
abort: source and destination form a cycle
[255]
$ hg rebase -s 6 -d 5
rebasing 6:3944801ae4ea "dev-two named branch"
rebasing 7:3bdb949809d9 "B"
rebasing 8:a0d543090fa4 "C"
rebasing 9:e9f862ce8bad "D" (tip)
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/3944801ae4ea-fb46ed74-rebase.hg
$ hg tglog
o 9: e522577ccdbd 'D'
|
o 8: 810110211f50 'C'
|
o 7: 160b0930ccc6 'B'
|
o 6: c57724c84928 'dev-two named branch'
|
o 5: 8e279d293175 'H'
|
| o 4: aeefee77ab01 'G'
|/|
o | 3: e908b85f3729 'F'
| |
o | 2: bc8139ee757c 'dev-one named branch' dev-one
| |
| o 1: 9520eea781bc 'E'
|/
@ 0: cd010b8cd998 'A'
Reopen branch by rebase
$ hg up -qr3
$ hg branch -q b
$ hg ci -m 'create b'
$ hg ci -m 'close b' --close
$ hg rebase -b 8 -d b
reopening closed branch head 2b586e70108d
rebasing 5:8e279d293175 "H"
rebasing 6:c57724c84928 "dev-two named branch"
rebasing 7:160b0930ccc6 "B"
rebasing 8:810110211f50 "C"
rebasing 9:e522577ccdbd "D"
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/8e279d293175-b023e27c-rebase.hg
$ cd ..
Rebase to other head on branch
Set up a case:
$ hg init case1
$ cd case1
$ touch f
$ hg ci -qAm0
$ hg branch -q b
$ echo >> f
$ hg ci -qAm 'b1'
$ hg up -qr -2
$ hg branch -qf b
$ hg ci -qm 'b2'
$ hg up -qr -3
$ hg branch -q c
$ hg ci -m 'c1'
$ hg tglog
@ 3: c062e3ecd6c6 'c1' c
|
| o 2: 792845bb77ee 'b2' b
|/
| o 1: 40039acb7ca5 'b1' b
|/
o 0: d681519c3ea7 '0'
$ hg clone -q . ../case2
rebase 'b2' to another lower branch head
$ hg up -qr 2
$ hg rebase
rebasing 2:792845bb77ee "b2"
note: rebase of 2:792845bb77ee created no changes to commit
saved backup bundle to $TESTTMP/case1/.hg/strip-backup/792845bb77ee-627120ee-rebase.hg
$ hg tglog
o 2: c062e3ecd6c6 'c1' c
|
| @ 1: 40039acb7ca5 'b1' b
|/
o 0: d681519c3ea7 '0'
rebase 'b1' on top of the tip of the branch ('b2') - ignoring the tip branch ('c1')
$ cd ../case2
$ hg up -qr 1
$ hg rebase
rebasing 1:40039acb7ca5 "b1"
saved backup bundle to $TESTTMP/case2/.hg/strip-backup/40039acb7ca5-342b72d1-rebase.hg
$ hg tglog
@ 3: 76abc1c6f8c7 'b1' b
|
| o 2: c062e3ecd6c6 'c1' c
| |
o | 1: 792845bb77ee 'b2' b
|/
o 0: d681519c3ea7 '0'
rebase 'c1' to the branch head 'c2' that is closed
$ hg branch -qf c
$ hg ci -qm 'c2 closed' --close
$ hg up -qr 2
$ hg tglog
_ 4: 8427af5d86f2 'c2 closed' c
|
o 3: 76abc1c6f8c7 'b1' b
|
| @ 2: c062e3ecd6c6 'c1' c
| |
o | 1: 792845bb77ee 'b2' b
|/
o 0: d681519c3ea7 '0'
$ hg rebase
abort: branch 'c' has one head - please rebase to an explicit rev
(run 'hg heads' to see all heads)
[255]
$ hg tglog
_ 4: 8427af5d86f2 'c2 closed' c
|
o 3: 76abc1c6f8c7 'b1' b
|
| @ 2: c062e3ecd6c6 'c1' c
| |
o | 1: 792845bb77ee 'b2' b
|/
o 0: d681519c3ea7 '0'
$ hg up -cr 1
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg branch x
marked working directory as branch x
$ hg rebase -r 3:: -d .
rebasing 3:76abc1c6f8c7 "b1"
rebasing 4:8427af5d86f2 "c2 closed" (tip)
note: rebase of 4:8427af5d86f2 created no changes to commit
saved backup bundle to $TESTTMP/case2/.hg/strip-backup/76abc1c6f8c7-cd698d13-rebase.hg
$ hg tglog
o 3: 117b0ed08075 'b1' x
|
| o 2: c062e3ecd6c6 'c1' c
| |
@ | 1: 792845bb77ee 'b2' b
|/
o 0: d681519c3ea7 '0'
$ cd ..