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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
Meirambek Omyrzak - - Load All Authors

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test-narrow-pull.t
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$ . "$TESTDIR/narrow-library.sh"
$ hg init master
$ cd master
$ cat >> .hg/hgrc <<EOF
> [narrow]
> serveellipses=True
> EOF
$ for x in `$TESTDIR/seq.py 10`
> do
> echo $x > "f$x"
> hg add "f$x"
> hg commit -m "Commit f$x"
> done
$ cd ..
narrow clone a couple files, f2 and f8
$ hg clone --narrow ssh://user@dummy/master narrow --include "f2" --include "f8"
requesting all changes
adding changesets
adding manifests
adding file changes
added 5 changesets with 2 changes to 2 files
new changesets *:* (glob)
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd narrow
$ ls
f2
f8
$ cat f2 f8
2
8
$ cd ..
change every upstream file twice
$ cd master
$ for x in `$TESTDIR/seq.py 10`
> do
> echo "update#1 $x" >> "f$x"
> hg commit -m "Update#1 to f$x" "f$x"
> done
$ for x in `$TESTDIR/seq.py 10`
> do
> echo "update#2 $x" >> "f$x"
> hg commit -m "Update#2 to f$x" "f$x"
> done
$ cd ..
look for incoming changes
$ cd narrow
$ hg incoming --limit 3
comparing with ssh://user@dummy/master
searching for changes
changeset: 5:ddc055582556
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Update#1 to f1
changeset: 6:f66eb5ad621d
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Update#1 to f2
changeset: 7:c42ecff04e99
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Update#1 to f3
Interrupting the pull is safe
$ hg --config hooks.pretxnchangegroup.bad=false pull -q
transaction abort!
rollback completed
abort: pretxnchangegroup.bad hook exited with status 1
[255]
$ hg id
223311e70a6f tip
pull new changes down to the narrow clone. Should get 8 new changesets: 4
relevant to the narrow spec, and 4 ellipsis nodes gluing them all together.
$ hg pull
pulling from ssh://user@dummy/master
searching for changes
adding changesets
adding manifests
adding file changes
added 9 changesets with 4 changes to 2 files
new changesets *:* (glob)
(run 'hg update' to get a working copy)
$ hg log -T '{rev}: {desc}\n'
13: Update#2 to f10
12: Update#2 to f8
11: Update#2 to f7
10: Update#2 to f2
9: Update#2 to f1
8: Update#1 to f8
7: Update#1 to f7
6: Update#1 to f2
5: Update#1 to f1
4: Commit f10
3: Commit f8
2: Commit f7
1: Commit f2
0: Commit f1
$ hg update tip
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
add a change and push it
$ echo "update#3 2" >> f2
$ hg commit -m "Update#3 to f2" f2
$ hg log f2 -T '{rev}: {desc}\n'
14: Update#3 to f2
10: Update#2 to f2
6: Update#1 to f2
1: Commit f2
$ hg push
pushing to ssh://user@dummy/master
searching for changes
remote: adding changesets
remote: adding manifests
remote: adding file changes
remote: added 1 changesets with 1 changes to 1 files
$ cd ..
$ cd master
$ hg log f2 -T '{rev}: {desc}\n'
30: Update#3 to f2
21: Update#2 to f2
11: Update#1 to f2
1: Commit f2
$ hg log -l 3 -T '{rev}: {desc}\n'
30: Update#3 to f2
29: Update#2 to f10
28: Update#2 to f9
Can pull into repo with a single commit
$ cd ..
$ hg clone -q --narrow ssh://user@dummy/master narrow2 --include "f1" -r 0
$ cd narrow2
$ hg pull -q -r 1
transaction abort!
rollback completed
abort: pull failed on remote
[255]
Can use 'hg share':
$ cat >> $HGRCPATH <<EOF
> [extensions]
> share=
> EOF
$ cd ..
$ hg share narrow2 narrow2-share
updating working directory
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd narrow2-share
$ hg status
We should also be able to unshare without breaking everything:
$ hg unshare
$ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 1 changesets with 1 changes to 1 files