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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-infinitepush.t
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#require no-reposimplestore
Testing infinipush extension and the confi options provided by it
Setup
$ . "$TESTDIR/library-infinitepush.sh"
$ cp $HGRCPATH $TESTTMP/defaulthgrc
$ setupcommon
$ hg init repo
$ cd repo
$ setupserver
$ echo initialcommit > initialcommit
$ hg ci -Aqm "initialcommit"
$ hg phase --public .
$ cd ..
$ hg clone ssh://user@dummy/repo client -q
Create two heads. Push first head alone, then two heads together. Make sure that
multihead push works.
$ cd client
$ echo multihead1 > multihead1
$ hg add multihead1
$ hg ci -m "multihead1"
$ hg up null
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo multihead2 > multihead2
$ hg ci -Am "multihead2"
adding multihead2
created new head
$ hg push -r . --bundle-store
pushing to ssh://user@dummy/repo
searching for changes
remote: pushing 1 commit:
remote: ee4802bf6864 multihead2
$ hg push -r '1:2' --bundle-store
pushing to ssh://user@dummy/repo
searching for changes
remote: pushing 2 commits:
remote: bc22f9a30a82 multihead1
remote: ee4802bf6864 multihead2
$ scratchnodes
bc22f9a30a821118244deacbd732e394ed0b686c ab1bc557aa090a9e4145512c734b6e8a828393a5
ee4802bf6864326a6b3dcfff5a03abc2a0a69b8f ab1bc557aa090a9e4145512c734b6e8a828393a5
Create two new scratch bookmarks
$ hg up 0
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo scratchfirstpart > scratchfirstpart
$ hg ci -Am "scratchfirstpart"
adding scratchfirstpart
created new head
$ hg push -r . -B scratch/firstpart
pushing to ssh://user@dummy/repo
searching for changes
remote: pushing 1 commit:
remote: 176993b87e39 scratchfirstpart
$ hg up 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo scratchsecondpart > scratchsecondpart
$ hg ci -Am "scratchsecondpart"
adding scratchsecondpart
created new head
$ hg push -r . -B scratch/secondpart
pushing to ssh://user@dummy/repo
searching for changes
remote: pushing 1 commit:
remote: 8db3891c220e scratchsecondpart
Pull two bookmarks from the second client
$ cd ..
$ hg clone ssh://user@dummy/repo client2 -q
$ cd client2
$ hg pull -B scratch/firstpart -B scratch/secondpart
pulling from ssh://user@dummy/repo
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
new changesets * (glob)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg log -r scratch/secondpart -T '{node}'
8db3891c220e216f6da214e8254bd4371f55efca (no-eol)
$ hg log -r scratch/firstpart -T '{node}'
176993b87e39bd88d66a2cccadabe33f0b346339 (no-eol)
Make two commits to the scratch branch
$ echo testpullbycommithash1 > testpullbycommithash1
$ hg ci -Am "testpullbycommithash1"
adding testpullbycommithash1
created new head
$ hg log -r '.' -T '{node}\n' > ../testpullbycommithash1
$ echo testpullbycommithash2 > testpullbycommithash2
$ hg ci -Aqm "testpullbycommithash2"
$ hg push -r . -B scratch/mybranch -q
Create third client and pull by commit hash.
Make sure testpullbycommithash2 has not fetched
$ cd ..
$ hg clone ssh://user@dummy/repo client3 -q
$ cd client3
$ hg pull -r `cat ../testpullbycommithash1`
pulling from ssh://user@dummy/repo
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets 33910bfe6ffe (1 drafts)
(run 'hg update' to get a working copy)
$ hg log -G -T '{desc} {phase} {bookmarks}'
o testpullbycommithash1 draft
|
@ initialcommit public
Make public commit in the repo and pull it.
Make sure phase on the client is public.
$ cd ../repo
$ echo publiccommit > publiccommit
$ hg ci -Aqm "publiccommit"
$ hg phase --public .
$ cd ../client3
$ hg pull
pulling from ssh://user@dummy/repo
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
new changesets a79b6597f322
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg log -G -T '{desc} {phase} {bookmarks} {node|short}'
o publiccommit public a79b6597f322
|
| o testpullbycommithash1 draft 33910bfe6ffe
|/
@ initialcommit public 67145f466344
$ hg up a79b6597f322
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo scratchontopofpublic > scratchontopofpublic
$ hg ci -Aqm "scratchontopofpublic"
$ hg push -r . -B scratch/scratchontopofpublic
pushing to ssh://user@dummy/repo
searching for changes
remote: pushing 1 commit:
remote: c70aee6da07d scratchontopofpublic
$ cd ../client2
$ hg pull -B scratch/scratchontopofpublic
pulling from ssh://user@dummy/repo
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets a79b6597f322:c70aee6da07d (1 drafts)
(run 'hg heads .' to see heads, 'hg merge' to merge)
$ hg log -r scratch/scratchontopofpublic -T '{phase}'
draft (no-eol)