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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-status-rev.t
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Tests of 'hg status --rev <rev>' to make sure status between <rev> and '.' get
combined correctly with the dirstate status.
$ hg init
First commit
$ $PYTHON $TESTDIR/generate-working-copy-states.py state 2 1
$ hg addremove --similarity 0
adding content1_content1_content1-tracked
adding content1_content1_content1-untracked
adding content1_content1_content3-tracked
adding content1_content1_content3-untracked
adding content1_content1_missing-tracked
adding content1_content1_missing-untracked
adding content1_content2_content1-tracked
adding content1_content2_content1-untracked
adding content1_content2_content2-tracked
adding content1_content2_content2-untracked
adding content1_content2_content3-tracked
adding content1_content2_content3-untracked
adding content1_content2_missing-tracked
adding content1_content2_missing-untracked
adding content1_missing_content1-tracked
adding content1_missing_content1-untracked
adding content1_missing_content3-tracked
adding content1_missing_content3-untracked
adding content1_missing_missing-tracked
adding content1_missing_missing-untracked
$ hg commit -m first
Second commit
$ $PYTHON $TESTDIR/generate-working-copy-states.py state 2 2
$ hg addremove --similarity 0
removing content1_missing_content1-tracked
removing content1_missing_content1-untracked
removing content1_missing_content3-tracked
removing content1_missing_content3-untracked
removing content1_missing_missing-tracked
removing content1_missing_missing-untracked
adding missing_content2_content2-tracked
adding missing_content2_content2-untracked
adding missing_content2_content3-tracked
adding missing_content2_content3-untracked
adding missing_content2_missing-tracked
adding missing_content2_missing-untracked
$ hg commit -m second
Working copy
$ $PYTHON $TESTDIR/generate-working-copy-states.py state 2 wc
$ hg addremove --similarity 0
adding content1_missing_content1-tracked
adding content1_missing_content1-untracked
adding content1_missing_content3-tracked
adding content1_missing_content3-untracked
adding content1_missing_missing-tracked
adding content1_missing_missing-untracked
adding missing_missing_content3-tracked
adding missing_missing_content3-untracked
adding missing_missing_missing-tracked
adding missing_missing_missing-untracked
$ hg forget *_*_*-untracked
$ rm *_*_missing-*
Status compared to parent of the working copy, i.e. the dirstate status
$ hg status -A --rev 1 'glob:missing_content2_content3-tracked'
M missing_content2_content3-tracked
$ hg status -A --rev 1 'glob:missing_content2_content2-tracked'
C missing_content2_content2-tracked
$ hg status -A --rev 1 'glob:missing_missing_content3-tracked'
A missing_missing_content3-tracked
$ hg status -A --rev 1 'glob:missing_missing_content3-untracked'
? missing_missing_content3-untracked
$ hg status -A --rev 1 'glob:missing_content2_*-untracked'
R missing_content2_content2-untracked
R missing_content2_content3-untracked
R missing_content2_missing-untracked
$ hg status -A --rev 1 'glob:missing_*_missing-tracked'
! missing_content2_missing-tracked
! missing_missing_missing-tracked
$ hg status -A --rev 1 'glob:missing_missing_missing-untracked'
missing_missing_missing-untracked: $ENOENT$
Status between first and second commit. Should ignore dirstate status.
$ hg status -A --rev 0:1 'glob:content1_content2_*'
M content1_content2_content1-tracked
M content1_content2_content1-untracked
M content1_content2_content2-tracked
M content1_content2_content2-untracked
M content1_content2_content3-tracked
M content1_content2_content3-untracked
M content1_content2_missing-tracked
M content1_content2_missing-untracked
$ hg status -A --rev 0:1 'glob:content1_content1_*'
C content1_content1_content1-tracked
C content1_content1_content1-untracked
C content1_content1_content3-tracked
C content1_content1_content3-untracked
C content1_content1_missing-tracked
C content1_content1_missing-untracked
$ hg status -A --rev 0:1 'glob:missing_content2_*'
A missing_content2_content2-tracked
A missing_content2_content2-untracked
A missing_content2_content3-tracked
A missing_content2_content3-untracked
A missing_content2_missing-tracked
A missing_content2_missing-untracked
$ hg status -A --rev 0:1 'glob:content1_missing_*'
R content1_missing_content1-tracked
R content1_missing_content1-untracked
R content1_missing_content3-tracked
R content1_missing_content3-untracked
R content1_missing_missing-tracked
R content1_missing_missing-untracked
$ hg status -A --rev 0:1 'glob:missing_missing_*'
Status compared to one revision back, checking that the dirstate status
is correctly combined with the inter-revision status
$ hg status -A --rev 0 'glob:content1_*_content[23]-tracked'
M content1_content1_content3-tracked
M content1_content2_content2-tracked
M content1_content2_content3-tracked
M content1_missing_content3-tracked
$ hg status -A --rev 0 'glob:content1_*_content1-tracked'
C content1_content1_content1-tracked
C content1_content2_content1-tracked
C content1_missing_content1-tracked
$ hg status -A --rev 0 'glob:missing_*_content?-tracked'
A missing_content2_content2-tracked
A missing_content2_content3-tracked
A missing_missing_content3-tracked
BROKEN: missing_content2_content[23]-untracked exist, so should be listed
$ hg status -A --rev 0 'glob:missing_*_content?-untracked'
? missing_missing_content3-untracked
$ hg status -A --rev 0 'glob:content1_*_*-untracked'
R content1_content1_content1-untracked
R content1_content1_content3-untracked
R content1_content1_missing-untracked
R content1_content2_content1-untracked
R content1_content2_content2-untracked
R content1_content2_content3-untracked
R content1_content2_missing-untracked
R content1_missing_content1-untracked
R content1_missing_content3-untracked
R content1_missing_missing-untracked
$ hg status -A --rev 0 'glob:*_*_missing-tracked'
! content1_content1_missing-tracked
! content1_content2_missing-tracked
! content1_missing_missing-tracked
! missing_content2_missing-tracked
! missing_missing_missing-tracked
$ hg status -A --rev 0 'glob:missing_*_missing-untracked'