exchangev2: fetch manifest revisions
Now that the server has support for retrieving manifest data, we can
implement the client bits to call it.
We teach the changeset fetching code to capture the manifest revisions
that are encountered on incoming changesets. We then feed this into a
new function which filters out known manifests and then batches up
manifest data requests to the server.
This is different from the previous wire protocol in a few notable
ways.
First, the client fetches manifest data separately and explicitly.
Before, we'd ask the server for data pertaining to some changesets
(via a "getbundle" command) and manifests (and files) would be sent
automatically. Providing an API for looking up just manifest data
separately gives clients much more flexibility for manifest management.
For example, a client may choose to only fetch manifest data on demand
instead of prefetching it (i.e. partial clone).
Second, we send N commands to the server for manifest retrieval instead
of 1. This property has a few nice side-effects. One is that the
deterministic nature of the requests lends itself to server-side
caching. For example, say the remote has 50,000 manifests. If the
server is configured to cache responses, each time a new commit
arrives, you will have a cache miss and need to regenerate all outgoing
data. But if you makes N requests requesting 10,000 manifests each,
a new commit will still yield cache hits on the initial, unchanged
manifest batches/requests.
A derived benefit from these properties is that resumable clone is
conceptually simpler to implement. When making a monolithic request
for all of the repository data, recovering from an interrupted clone
is hard because the server was in the driver's seat and was maintaining
state about all the data that needed transferred. With the client
driving fetching, the client can persist the set of unfetched entities
and retry/resume a fetch if something goes wrong. Or we can fetch all
data N changesets at a time and slowly build up a repository. This
approach is drastically easier to implement when we have server APIs
exposing low-level repository primitives (such as manifests and files).
We don't yet support tree manifests. But it should be possible to
implement that with the existing wire protocol command.
Differential Revision: https://phab.mercurial-scm.org/D4489
Tests for wire protocol version 2 exchange.
Tests in this file should be folded into existing tests once protocol
v2 has enough features that it can be enabled via #testcase in existing
tests.
$ . $TESTDIR/wireprotohelpers.sh
$ enablehttpv2client
$ hg init server-simple
$ enablehttpv2 server-simple
$ cd server-simple
$ cat >> .hg/hgrc << EOF
> [phases]
> publish = false
> EOF
$ echo a0 > a
$ echo b0 > b
$ hg -q commit -A -m 'commit 0'
$ echo a1 > a
$ hg commit -m 'commit 1'
$ hg phase --public -r .
$ echo a2 > a
$ hg commit -m 'commit 2'
$ hg -q up -r 0
$ echo b1 > b
$ hg -q commit -m 'head 2 commit 1'
$ echo b2 > b
$ hg -q commit -m 'head 2 commit 2'
$ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS
$ cd ..
Test basic clone
$ hg --debug clone -U http://localhost:$HGPORT client-simple
using http://localhost:$HGPORT/
sending capabilities command
query 1; heads
sending 2 commands
sending command heads: {}
sending command known: {
'nodes': []
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=43; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
received frame(size=11; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=1; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=3; stream=2; streamflags=; type=command-response; flags=eos)
sending 1 commands
sending command changesetdata: {
'fields': set([
'bookmarks',
'parents',
'phase',
'revision'
]),
'noderange': [
[],
[
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1',
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f'
]
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=871; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
add changeset 3390ef850073
add changeset 4432d83626e8
add changeset cd2534766bec
add changeset e96ae20f4188
add changeset caa2a465451d
checking for updated bookmarks
sending 1 commands
sending command manifestdata: {
'fields': set([
'parents',
'revision'
]),
'nodes': [
'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
'\xa9\x88\xfbCX>\x87\x1d\x1e\xd5u\x0e\xe0t\xc6\xd8@\xbb\xbf\xc8',
'\xec\x80NH\x8c \x88\xc25\t\x9a\x10 u\x13\xbe\xcd\xc3\xdd\xa5',
'\x04\\\x7f9\'\xda\x13\xe7Z\xf8\xf0\xe4\xf0HI\xe4a\xa9x\x0f',
'7\x9c\xb0\xc2\xe6d\\y\xdd\xc5\x9a\x1dG\'\xa9\xfb\x83\n\xeb&'
],
'tree': ''
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=922; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
updating the branch cache
new changesets 3390ef850073:caa2a465451d (3 drafts)
All changesets should have been transferred
$ hg -R client-simple debugindex -c
rev linkrev nodeid p1 p2
0 0 3390ef850073 000000000000 000000000000
1 1 4432d83626e8 3390ef850073 000000000000
2 2 cd2534766bec 4432d83626e8 000000000000
3 3 e96ae20f4188 3390ef850073 000000000000
4 4 caa2a465451d e96ae20f4188 000000000000
$ hg -R client-simple log -G -T '{rev} {node} {phase}\n'
o 4 caa2a465451dd1facda0f5b12312c355584188a1 draft
|
o 3 e96ae20f4188487b9ae4ef3941c27c81143146e5 draft
|
| o 2 cd2534766bece138c7c1afdc6825302f0f62d81f draft
| |
| o 1 4432d83626e8a98655f062ec1f2a43b07f7fbbb0 public
|/
o 0 3390ef850073fbc2f0dfff2244342c8e9229013a public
All manifests should have been transferred
$ hg -R client-simple debugindex -m
rev linkrev nodeid p1 p2
0 0 992f4779029a 000000000000 000000000000
1 1 a988fb43583e 992f4779029a 000000000000
2 2 ec804e488c20 a988fb43583e 000000000000
3 3 045c7f3927da 992f4779029a 000000000000
4 4 379cb0c2e664 045c7f3927da 000000000000
Cloning only a specific revision works
$ hg --debug clone -U -r 4432d83626e8 http://localhost:$HGPORT client-singlehead
using http://localhost:$HGPORT/
sending capabilities command
sending 1 commands
sending command lookup: {
'key': '4432d83626e8'
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=21; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
query 1; heads
sending 2 commands
sending command heads: {}
sending command known: {
'nodes': []
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=43; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
received frame(size=11; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=1; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=3; stream=2; streamflags=; type=command-response; flags=eos)
sending 1 commands
sending command changesetdata: {
'fields': set([
'bookmarks',
'parents',
'phase',
'revision'
]),
'noderange': [
[],
[
'D2\xd86&\xe8\xa9\x86U\xf0b\xec\x1f*C\xb0\x7f\x7f\xbb\xb0'
]
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=353; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
add changeset 3390ef850073
add changeset 4432d83626e8
checking for updated bookmarks
sending 1 commands
sending command manifestdata: {
'fields': set([
'parents',
'revision'
]),
'nodes': [
'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
'\xa9\x88\xfbCX>\x87\x1d\x1e\xd5u\x0e\xe0t\xc6\xd8@\xbb\xbf\xc8'
],
'tree': ''
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=376; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
updating the branch cache
new changesets 3390ef850073:4432d83626e8
$ cd client-singlehead
$ hg log -G -T '{rev} {node} {phase}\n'
o 1 4432d83626e8a98655f062ec1f2a43b07f7fbbb0 public
|
o 0 3390ef850073fbc2f0dfff2244342c8e9229013a public
$ hg debugindex -m
rev linkrev nodeid p1 p2
0 0 992f4779029a 000000000000 000000000000
1 1 a988fb43583e 992f4779029a 000000000000
Incremental pull works
$ hg --debug pull
pulling from http://localhost:$HGPORT/
using http://localhost:$HGPORT/
sending capabilities command
query 1; heads
sending 2 commands
sending command heads: {}
sending command known: {
'nodes': [
'D2\xd86&\xe8\xa9\x86U\xf0b\xec\x1f*C\xb0\x7f\x7f\xbb\xb0'
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=43; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
received frame(size=11; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=2; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=3; stream=2; streamflags=; type=command-response; flags=eos)
searching for changes
all local heads known remotely
sending 1 commands
sending command changesetdata: {
'fields': set([
'bookmarks',
'parents',
'phase',
'revision'
]),
'noderange': [
[
'D2\xd86&\xe8\xa9\x86U\xf0b\xec\x1f*C\xb0\x7f\x7f\xbb\xb0'
],
[
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1',
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f'
]
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=571; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
add changeset cd2534766bec
add changeset e96ae20f4188
add changeset caa2a465451d
checking for updated bookmarks
sending 1 commands
sending command manifestdata: {
'fields': set([
'parents',
'revision'
]),
'nodes': [
'\xec\x80NH\x8c \x88\xc25\t\x9a\x10 u\x13\xbe\xcd\xc3\xdd\xa5',
'\x04\\\x7f9\'\xda\x13\xe7Z\xf8\xf0\xe4\xf0HI\xe4a\xa9x\x0f',
'7\x9c\xb0\xc2\xe6d\\y\xdd\xc5\x9a\x1dG\'\xa9\xfb\x83\n\xeb&'
],
'tree': ''
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=559; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
updating the branch cache
new changesets cd2534766bec:caa2a465451d (3 drafts)
(run 'hg update' to get a working copy)
$ hg log -G -T '{rev} {node} {phase}\n'
o 4 caa2a465451dd1facda0f5b12312c355584188a1 draft
|
o 3 e96ae20f4188487b9ae4ef3941c27c81143146e5 draft
|
| o 2 cd2534766bece138c7c1afdc6825302f0f62d81f draft
| |
| o 1 4432d83626e8a98655f062ec1f2a43b07f7fbbb0 public
|/
o 0 3390ef850073fbc2f0dfff2244342c8e9229013a public
$ hg debugindex -m
rev linkrev nodeid p1 p2
0 0 992f4779029a 000000000000 000000000000
1 1 a988fb43583e 992f4779029a 000000000000
2 2 ec804e488c20 a988fb43583e 000000000000
3 3 045c7f3927da 992f4779029a 000000000000
4 4 379cb0c2e664 045c7f3927da 000000000000
Phase-only update works
$ hg -R ../server-simple phase --public -r caa2a465451dd
$ hg --debug pull
pulling from http://localhost:$HGPORT/
using http://localhost:$HGPORT/
sending capabilities command
query 1; heads
sending 2 commands
sending command heads: {}
sending command known: {
'nodes': [
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f',
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1'
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=43; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
received frame(size=11; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=3; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=3; stream=2; streamflags=; type=command-response; flags=eos)
searching for changes
all remote heads known locally
sending 1 commands
sending command changesetdata: {
'fields': set([
'bookmarks',
'parents',
'phase',
'revision'
]),
'noderange': [
[
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1',
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f'
],
[
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1',
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f'
]
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=92; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
checking for updated bookmarks
2 local changesets published
(run 'hg update' to get a working copy)
$ hg log -G -T '{rev} {node} {phase}\n'
o 4 caa2a465451dd1facda0f5b12312c355584188a1 public
|
o 3 e96ae20f4188487b9ae4ef3941c27c81143146e5 public
|
| o 2 cd2534766bece138c7c1afdc6825302f0f62d81f draft
| |
| o 1 4432d83626e8a98655f062ec1f2a43b07f7fbbb0 public
|/
o 0 3390ef850073fbc2f0dfff2244342c8e9229013a public
$ cd ..
Bookmarks are transferred on clone
$ hg -R server-simple bookmark -r 3390ef850073fbc2f0dfff2244342c8e9229013a book-1
$ hg -R server-simple bookmark -r cd2534766bece138c7c1afdc6825302f0f62d81f book-2
$ hg --debug clone -U http://localhost:$HGPORT/ client-bookmarks
using http://localhost:$HGPORT/
sending capabilities command
query 1; heads
sending 2 commands
sending command heads: {}
sending command known: {
'nodes': []
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=43; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
received frame(size=11; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=1; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=3; stream=2; streamflags=; type=command-response; flags=eos)
sending 1 commands
sending command changesetdata: {
'fields': set([
'bookmarks',
'parents',
'phase',
'revision'
]),
'noderange': [
[],
[
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1',
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f'
]
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=909; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
add changeset 3390ef850073
add changeset 4432d83626e8
add changeset cd2534766bec
add changeset e96ae20f4188
add changeset caa2a465451d
checking for updated bookmarks
adding remote bookmark book-1
adding remote bookmark book-2
sending 1 commands
sending command manifestdata: {
'fields': set([
'parents',
'revision'
]),
'nodes': [
'\x99/Gy\x02\x9a=\xf8\xd0fm\x00\xbb\x92OicN&A',
'\xa9\x88\xfbCX>\x87\x1d\x1e\xd5u\x0e\xe0t\xc6\xd8@\xbb\xbf\xc8',
'\xec\x80NH\x8c \x88\xc25\t\x9a\x10 u\x13\xbe\xcd\xc3\xdd\xa5',
'\x04\\\x7f9\'\xda\x13\xe7Z\xf8\xf0\xe4\xf0HI\xe4a\xa9x\x0f',
'7\x9c\xb0\xc2\xe6d\\y\xdd\xc5\x9a\x1dG\'\xa9\xfb\x83\n\xeb&'
],
'tree': ''
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=922; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
updating the branch cache
new changesets 3390ef850073:caa2a465451d (1 drafts)
$ hg -R client-bookmarks bookmarks
book-1 0:3390ef850073
book-2 2:cd2534766bec
Server-side bookmark moves are reflected during `hg pull`
$ hg -R server-simple bookmark -r cd2534766bece138c7c1afdc6825302f0f62d81f book-1
moving bookmark 'book-1' forward from 3390ef850073
$ hg -R client-bookmarks --debug pull
pulling from http://localhost:$HGPORT/
using http://localhost:$HGPORT/
sending capabilities command
query 1; heads
sending 2 commands
sending command heads: {}
sending command known: {
'nodes': [
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f',
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1'
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=43; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
received frame(size=11; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=3; request=3; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=3; stream=2; streamflags=; type=command-response; flags=eos)
searching for changes
all remote heads known locally
sending 1 commands
sending command changesetdata: {
'fields': set([
'bookmarks',
'parents',
'phase',
'revision'
]),
'noderange': [
[
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1',
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f'
],
[
'\xca\xa2\xa4eE\x1d\xd1\xfa\xcd\xa0\xf5\xb1#\x12\xc3UXA\x88\xa1',
'\xcd%4vk\xec\xe18\xc7\xc1\xaf\xdch%0/\x0fb\xd8\x1f'
]
]
}
received frame(size=11; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=continuation)
received frame(size=144; request=1; stream=2; streamflags=; type=command-response; flags=continuation)
received frame(size=0; request=1; stream=2; streamflags=; type=command-response; flags=eos)
checking for updated bookmarks
updating bookmark book-1
(run 'hg update' to get a working copy)
$ hg -R client-bookmarks bookmarks
book-1 2:cd2534766bec
book-2 2:cd2534766bec