Mercurial > hg
annotate mercurial/bdiff.h @ 37052:8c3c47362934
wireproto: implement basic frame reading and processing
We just implemented support for writing frames. Now let's implement
support for reading them.
The bulk of the new code is for a class that maintains the state of
a server. Essentially, you construct an instance, feed frames to it,
and it tells you what you should do next. The design is inspired by
the "sans I/O" movement and the reactor pattern. We don't want to
perform I/O or any major blocking event during frame ingestion because
this arbitrarily limits ways that server pieces can be implemented.
For example, it makes it much harder to swap in an alternate
implementation based on asyncio or do crazy things like have requests
dispatch to other processes.
We do still implement readframe() which does I/O. But it is decoupled
from the server reactor. And important parsing of frame headers is
a standalone function. So I/O is only needed to obtain frame data.
Because testing server-side ingest is useful and difficult on running
servers, we create a new "debugreflect" endpoint that will echo back
to the client what was received and how it was interpreted. This could
be useful for a server admin, someone implementing a client. But
immediately, it is useful for testing: we're able to demonstrate that
frames are parsed correctly and turned into requests to run commands
without having to implement command dispatch on the server!
In addition, we implement Python level unit tests for the reactor.
This is vastly more efficient than sending requests to the
"debugreflect" endpoint and vastly more powerful for advanced
testing.
Differential Revision: https://phab.mercurial-scm.org/D2852
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Wed, 14 Mar 2018 15:25:06 -0700 |
parents | 174d115d8104 |
children | d86908050375 |
rev | line source |
---|---|
29541
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
1 #ifndef _HG_BDIFF_H_ |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
2 #define _HG_BDIFF_H_ |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
3 |
34652
174d115d8104
bdiff: include compat.h in header to define ssize_t
Yuya Nishihara <yuya@tcha.org>
parents:
34627
diff
changeset
|
4 #include "compat.h" |
174d115d8104
bdiff: include compat.h in header to define ssize_t
Yuya Nishihara <yuya@tcha.org>
parents:
34627
diff
changeset
|
5 |
29541
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
6 struct bdiff_line { |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
7 int hash, n, e; |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
8 ssize_t len; |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
9 const char *l; |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
10 }; |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
11 |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
12 struct bdiff_hunk; |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
13 struct bdiff_hunk { |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
14 int a1, a2, b1, b2; |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
15 struct bdiff_hunk *next; |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
16 }; |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
17 |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
18 int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr); |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
19 int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn, |
34627
72985b390d7c
bdiff: format header file with clang-format
Augie Fackler <augie@google.com>
parents:
29541
diff
changeset
|
20 struct bdiff_hunk *base); |
29541
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
21 void bdiff_freehunks(struct bdiff_hunk *l); |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
22 |
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents:
diff
changeset
|
23 #endif |