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519 Commits

Author SHA1 Message Date
Richard van der Hoff
318711e139 Set Server header in SynapseRequest 
(instead of everywhere that writes a response. Or rather, the subset of places
which write responses where we haven't forgotten it).

This also means that we don't have to have the mysterious version_string
attribute in anything with a request handler.

Unfortunately it does mean that we have to pass the version string wherever we
instantiate a SynapseSite, which has been c&ped 150 times, but that is code
that ought to be cleaned up anyway really.
 2018-05-10 18:50:27 +01:00
Konstantinos Sideris
88868b2839 notifications: Convert next_token to string according to the spec 
Currently the parameter is serialized as an integer.

Signed-off-by: Konstantinos Sideris <sideris.konstantin@gmail.com>
 2018-05-05 12:55:02 +03:00
Adrian Tschira
122593265b Construct HMAC as bytes on py3 
Signed-off-by: Adrian Tschira <nota@notafile.com>
 2018-04-29 00:19:41 +02:00
Richard van der Hoff
a3599dda97
Merge pull request #2996 from krombel/allow_auto_join_rooms 
move handling of auto_join_rooms to RegisterHandler
 2018-04-10 01:11:00 +01:00
Luke Barnard
104c0bc1d5 Use "/settings/" (plural) 2018-04-05 14:07:16 +01:00
Luke Barnard
eb8d8d6f57 Use join_policy API instead of joinable 
The API is now under
 /groups/$group_id/setting/m.join_policy

and expects a JSON blob of the shape

```json
{
  "m.join_policy": {
    "type": "invite"
  }
}
```

where "invite" could alternatively be "open".
 2018-04-03 16:16:40 +01:00
David Baker
c5de6987c2 This should probably be a PUT 2018-03-28 16:44:11 +01:00
David Baker
79452edeee Add joinability for groups 
Adds API to set the 'joinable' flag, and corresponding flag in the
table.
 2018-03-28 14:03:37 +01:00
Krombel
6152e253d8 Merge branch 'develop' of into allow_auto_join_rooms 2018-03-28 14:45:28 +02:00
Erik Johnston
a8ce159be4 Replace some ujson with simplejson to make it work 2018-03-16 00:27:09 +00:00
Krombel
91ea0202e6 move handling of auto_join_rooms to RegisterHandler 
Currently the handling of auto_join_rooms only works when a user
registers itself via public register api. Registrations via
registration_shared_secret and ModuleApi do not work

This auto_joins the users in the registration handler which enables
the auto join feature for all 3 registration paths.

This is related to issue #2725

Signed-Off-by: Matthias Kesler <krombel@krombel.de>
 2018-03-14 16:45:37 +01:00
Erik Johnston
784f036306 Move RoomMemberHandler out of Handlers 2018-03-01 14:36:50 +00:00
Matthew Hodgson
9a72b70630 fix thinko on 3pid whitelisting 2018-01-24 11:07:47 +01:00
Matthew Hodgson
49fce04624 fix typo (thanks sytest) 2018-01-19 19:55:38 +00:00
Matthew Hodgson
62d7d66ae5 oops, check all login types 2018-01-19 18:23:56 +00:00
Matthew Hodgson
293380bef7 trailing commas 2018-01-19 15:38:53 +00:00
Matthew Hodgson
447f4f0d5f rewrite based on PR feedback: 
* [ ] split config options into allowed_local_3pids and registrations_require_3pid
 * [ ] simplify and comment logic for picking registration flows
 * [ ] fix docstring and move check_3pid_allowed into a new util module
 * [ ] use check_3pid_allowed everywhere

@erikjohnston PTAL
 2018-01-19 15:33:55 +00:00
Matthew Hodgson
9d332e0f79 fix up v1, and improve errors 2018-01-19 00:53:58 +00:00
Matthew Hodgson
0af58f14ee fix pep8 2018-01-19 00:33:51 +00:00
Matthew Hodgson
28a6ccb49c add registrations_require_3pid 
lets homeservers specify a whitelist for 3PIDs that users are allowed to associate with.
Typically useful for stopping people from registering with non-work emails
 2018-01-19 00:19:58 +00:00
Richard van der Hoff
16ec3805e5 Fix error when deleting devices 
This was introduced in d7ea8c4 / PR #2728
 2017-12-05 09:49:22 +00:00
Richard van der Hoff
d7ea8c4800 Factor out a validate_user_via_ui_auth method 
Collect together all the places that validate a logged-in user via UI auth.
 2017-12-05 09:42:30 +00:00
Richard van der Hoff
d5f9fb06b0 Refactor UI auth implementation 
Instead of returning False when auth is incomplete, throw an exception which
can be caught with a wrapper.
 2017-12-05 09:40:05 +00:00
Richard van der Hoff
ae31f8ce45 Move set_password into its own handler 
Non-functional refactoring to move set_password. This means that we'll be able
to properly deactivate devices and access tokens without introducing a
dependency loop.
 2017-11-29 16:44:35 +00:00
Richard van der Hoff
7ca5c68233 Move deactivate_account into its own handler 
Non-functional refactoring to move deactivate_account. This means that we'll be
able to properly deactivate devices and access tokens without introducing a
dependency loop.
 2017-11-29 16:44:35 +00:00
Luke Barnard
ab1b2d0ff2 Allow guest access to group APIs for reading 2017-11-28 11:23:00 +00:00
Travis Ralston
812c191939 Remove redundent call 
Signed-off-by: Travis Ralston <travpc@gmail.com>
 2017-11-13 12:44:21 -07:00
Travis Ralston
2d314b771f Add a route for determining who you are 
Useful for applications which may have an access token, but no idea as to who owns it.

Signed-off-by: Travis Ralston <travpc@gmail.com>
 2017-11-12 23:39:38 -07:00
Richard van der Hoff
e508145c9b Add some more comments appservice user registration 
Explain why we don't validate userids registered via app services
 2017-11-10 12:39:45 +00:00
Richard van der Hoff
e0ebd1e4bd Downcase userids for shared-secret registration 2017-11-10 12:39:05 +00:00
Richard van der Hoff
9b599bc18d Downcase userid on registration 
Force username to lowercase before attempting to register

https://github.com/matrix-org/synapse/issues/2660
 2017-11-09 22:20:01 +00:00
Erik Johnston
4e2b2508af Register group servlet 2017-11-09 15:49:42 +00:00
Erik Johnston
e8814410ef Have an explicit API to update room config 2017-11-08 16:13:27 +00:00
Erik Johnston
94ff2cda73
Revert "Modify group room association API to allow modification of is_public" 2017-11-08 15:43:34 +00:00
Richard van der Hoff
6c3a02072b support inhibit_login in /register 
Allow things to pass inhibit_login when registering to ... inhibit logins.
 2017-11-02 16:31:07 +00:00
David Baker
4f0488b307 Merge remote-tracking branch 'origin/develop' into rav/refactor_accesstoken_delete 2017-11-01 16:20:19 +00:00
David Baker
e5e930aec3
Merge pull request #2615 from matrix-org/rav/break_auth_device_dep 
Break dependency of auth_handler on device_handler
 2017-11-01 16:06:31 +00:00
Richard van der Hoff
dd13310fb8 Move access token deletion into auth handler 
Also move duplicated deactivation code into the auth handler.

I want to add some hooks when we deactivate an access token, so let's bring it
all in here so that there's somewhere to put it.
 2017-11-01 15:46:22 +00:00
Richard van der Hoff
74c56f794c Break dependency of auth_handler on device_handler 
I'm going to need to make the device_handler depend on the auth_handler, so I
need to break this dependency to avoid a cycle.

It turns out that the auth_handler was only using the device_handler in one
place which was an edge case which we can more elegantly handle by throwing an
error rather than fixing it up.
 2017-11-01 10:27:06 +00:00
Luke Barnard
20fe347906 Modify group room association API to allow modification of is_public 
also includes renamings to make things more consistent.
 2017-10-31 17:04:28 +00:00
Richard van der Hoff
4d83632009 Merge pull request #2591 from matrix-org/rav/device_delete_auth 
Device deletion: check UI auth matches access token
 2017-10-27 12:30:10 +01:00
Richard van der Hoff
110b373e9c Merge pull request #2589 from matrix-org/rav/as_deactivate_account 
Allow ASes to deactivate their own users
 2017-10-27 12:29:32 +01:00
Luke Barnard
d8c26162a1 Merge pull request #2582 from matrix-org/luke/group-is-public 
Add is_public to groups table to allow for private groups
 2017-10-27 11:41:13 +01:00
Richard van der Hoff
7a6546228b Device deletion: check UI auth matches access token 
(otherwise there's no point in the UI auth)
 2017-10-27 00:04:31 +01:00
Richard van der Hoff
785bd7fd75 Allow ASes to deactivate their own users 2017-10-27 00:01:00 +01:00
Luke Barnard
595fe67f01 delint 2017-10-26 17:20:24 +01:00
Luke Barnard
9b2feef9eb Add is_public to groups table to allow for private groups 
Prevent group API access to non-members for private groups

Also make all the group code paths consistent with `requester_user_id` always being the User ID of the requesting user.
 2017-10-26 16:51:32 +01:00
Krombel
8299b323ee add release endpoints for /thirdparty 2017-10-26 16:58:20 +02:00
Krombel
9b436c8b4c register some /unstable endpoints in /r0 as well 2017-10-26 15:22:50 +02:00
Richard van der Hoff
eaaabc6c4f replace 'except:' with 'except Exception:' 
what could possibly go wrong
 2017-10-23 15:52:32 +01:00
Richard van der Hoff
631d7b87b5 Remove pointless create() method 
It just calls the constructor, so we may as well kill it rather than having
random codepaths.
 2017-10-20 22:14:55 +01:00
David Baker
4e242b3e20 Merge pull request #2545 from matrix-org/dbkr/auto_join_rooms 
Add config option to auto-join new users to rooms
 2017-10-17 11:45:49 +01:00
David Baker
c05e6015cc Add config option to auto-join new users to rooms 
New users who register on the server will be dumped into all rooms in
auto_join_rooms in the config.
 2017-10-16 17:57:27 +01:00
Luke Barnard
85f5674e44 Delint 2017-10-16 15:52:17 +01:00
Luke Barnard
2c5972f87f Implement GET /groups/$groupId/invited_users 2017-10-16 15:31:11 +01:00
Erik Johnston
17b8e2bd02 Add remove room API 2017-09-26 15:52:41 +01:00
Erik Johnston
b5feaa5a49 Merge branch 'develop' of github.com:matrix-org/synapse into erikj/groups_merged 2017-09-19 11:07:45 +01:00
Erik Johnston
69ef4987a6 Add left section to /keys/changes 2017-09-08 14:44:36 +01:00
Erik Johnston
53cc8ad35a Send down device list change notif when member leaves/rejoins room 2017-09-07 15:08:39 +01:00
Erik Johnston
ba3ff7918b Fixup 2017-08-11 13:42:42 +01:00
Erik Johnston
ef8e578677 Add bulk group publicised lookup API 2017-08-09 13:36:22 +01:00
Erik Johnston
b880ff190a Allow update group publicity 2017-08-08 14:19:41 +01:00
Erik Johnston
09552f9d9c Reduce spammy log line in synchrotrons 2017-08-02 17:29:51 +01:00
Erik Johnston
96917d5552 Merge pull request #2378 from matrix-org/erikj/group_sync_support 
Add groups to sync stream
 2017-07-21 11:05:39 +01:00
Erik Johnston
b238cf7f6b Remove spurious content param 2017-07-20 17:49:55 +01:00
Erik Johnston
c544188ee3 Add groups to sync stream 2017-07-20 16:36:42 +01:00
Erik Johnston
6f443a74cf Add update group profile API 2017-07-20 09:46:33 +01:00
Erik Johnston
14a34f12d7 Comments 2017-07-18 17:28:42 +01:00
Erik Johnston
3431ec55dc Comments 2017-07-18 17:23:50 +01:00
Erik Johnston
2f9eafdd36 Add local group server support 2017-07-17 12:03:49 +01:00
Krombel
85b9f76f1d split out reducing stuff; just make encode_* static 2017-07-11 13:14:35 +02:00
Krombel
2f82de18ee fix test 2017-07-10 17:34:58 +02:00
Krombel
6e16aca8b0 encode sync-response statically; omit empty objects from sync-response 2017-07-10 16:42:17 +02:00
Erik Johnston
a9d6fa8b2b Include users who share room with requester in user directory 2017-06-15 10:17:21 +01:00
Erik Johnston
63fda37e20 Add comments 2017-05-31 15:00:29 +01:00
Erik Johnston
535c99f157 Use POST 2017-05-31 14:15:45 +01:00
Erik Johnston
45a5df5914 Add REST API 2017-05-31 14:11:55 +01:00
Erik Johnston
b4f59c7e27 Add count of one time keys to sync stream 2017-05-19 15:47:55 +01:00
Pablo Saavedra
224137fcf9 Fixed syntax nits 2017-05-15 16:21:02 +02:00
Pablo Saavedra
627e6ea2b0 Fixed implementation errors 
* Added HS as property in SyncRestServlet
* Fixed set_timeline_upper_limit function implementat¡ion
 2017-05-15 14:51:43 +02:00
Pablo Saavedra
9da4316ca5 Configurable maximum number of events requested by /sync and /messages (#2220) 
Set the limit on the returned events in the timeline in the get and sync
operations. The default value is -1, means no upper limit.

For example, using `filter_timeline_limit: 5000`:

POST /_matrix/client/r0/user/user:id/filter
{
room: {
    timeline: {
      limit: 1000000000000000000
    }
}
}

GET /_matrix/client/r0/user/user:id/filter/filter:id

{
room: {
    timeline: {
      limit: 5000
    }
}
}

The server cuts down the room.timeline.limit.
 2017-05-13 18:17:54 +02:00
Luke Barnard
369195caa5 Modify register/available to be GET with query param 
- GET is now the method for register/available
- a query parameter "username" is now used

Also, empty usernames are now handled with an error message on registration or via register/available: `User ID cannot be empty`
 2017-05-10 17:23:55 +01:00
Luke Barnard
f7278e612e Change register/available to POST (from GET) 2017-05-10 11:40:18 +01:00
Luke Barnard
3669065466 Appease the flake8 gods 2017-05-03 18:05:49 +01:00
Luke Barnard
34ed4f4206 Implement username availability checker 
Outlined here: https://github.com/vector-im/riot-web/issues/3605#issuecomment-298679388

```HTTP
GET /_matrix/.../register/available
{
    "username": "desiredlocalpart123"
}
```

If available, the response looks like
```HTTP
HTTP/1.1 200 OK
{
    "available": true
}
```

Otherwise,
```HTTP
HTTP/1.1 429
{
    "errcode": "M_LIMIT_EXCEEDED",
    "error": "Too Many Requests",
    "retry_after_ms": 2000
}
```
or
```HTTP
HTTP/1.1 400
{
    "errcode": "M_USER_IN_USE",
    "error": "User ID already taken."
}

```
or
```HTTP
HTTP/1.1 400
{
    "errcode": "M_INVALID_USERNAME",
    "error": "Some reason for username being invalid"
}
```
 2017-05-03 12:04:12 +01:00
Erik Johnston
46826bb078 Comment and remove spurious logging 2017-04-27 17:25:44 +01:00
Erik Johnston
34e682d385 Fix invite state to always include all events 2017-04-26 16:18:08 +01:00
Luke Barnard
3fb8784c92 m.read_marker -> m.fully_read (#2128) 
Also:
 - change the REST endpoint to have a "S" on the end (so it's now /read_markers)
 - change the content of the m.read_up_to event to have the key "event_id" instead of "marker".
 2017-04-18 17:46:15 +01:00
Luke Barnard
cf6121e3da More null-guard changes 2017-04-12 14:02:03 +01:00
Luke Barnard
c0aba0a23e Remove Unused ref to hs 2017-04-12 10:52:11 +01:00
Luke Barnard
b9676a75f6 Move a space 2017-04-12 10:51:17 +01:00
Luke Barnard
0127423027 flake8 2017-04-11 17:07:07 +01:00
Luke Barnard
d892079844 Finish implementing RM endpoint 
- This change causes a 405 to be sent if "m.read_marker" is set via /account_data
 - This also fixes-up the RM endpoint so that it actually Works.
 2017-04-11 15:01:39 +01:00
lukebarnard
e263c26690 Initial commit of RM server-side impl 
(See https://docs.google.com/document/d/1UWqdS-e1sdwkLDUY0wA4gZyIkRp-ekjsLZ8k6g_Zvso/edit#heading=h.lndohpg8at5u)
 2017-04-11 11:55:30 +01:00
Erik Johnston
2a06b44be2 Merge pull request #1986 from matrix-org/matthew/enable_guest_3p 
enable guest access for the 3pl/3pid APIs
 2017-03-31 14:36:03 +01:00
Matthew Hodgson
9ee397b440 switch to allow_guest=True for authing 3Ps as per PR feedback 2017-03-31 13:54:26 +01:00
Richard van der Hoff
01fc847f7f Merge pull request #2057 from matrix-org/rav/missing_yield_2 
Add another missing yield on check_device_registered
 2017-03-24 12:46:43 +00:00
Richard van der Hoff
13c8749ac9 Add another missing yield on check_device_registered 2017-03-23 22:18:53 +00:00
David Baker
a2dfab12c5 Fix token request for addition of phone numbers 2017-03-23 18:46:17 +00:00
Erik Johnston
a297155a97 Remove unused import 2017-03-15 14:49:25 +00:00
Erik Johnston
6c82de5100 Format presence events on the edges instead of reformatting them multiple times 2017-03-15 14:27:34 +00:00
Erik Johnston
7827251daf Merge pull request #1994 from matrix-org/dbkr/msisdn_signin_2 
Phone number registration / login support v2
 2017-03-15 09:59:54 +00:00
David Baker
7b6ed9871e Use extend instead of += 2017-03-14 10:49:55 +00:00
David Baker
d79a687d85 Oops, remove print 2017-03-14 10:40:20 +00:00
Luke Barnard
bbeeb97f75 Implement _simple_delete_many_txn, use it to delete devices 
(But this doesn't implement the same for deleting access tokens or e2e keys.

Also respond to code review.
 2017-03-13 17:53:23 +00:00
David Baker
0a9945220e Fix registration for broken clients 
Only offer msisdn flows if the x_show_msisdn option is given.
 2017-03-13 17:29:38 +00:00
David Baker
73a5f06652 Support registration / login with phone number 
Changes from https://github.com/matrix-org/synapse/pull/1971
 2017-03-13 17:27:51 +00:00
Luke Barnard
c077c3277b Flake 2017-03-13 16:45:38 +00:00
Luke Barnard
c81f33f73d Implement delete_devices API 
This implements the proposal here https://docs.google.com/document/d/1C-25Gqz3TXy2jIAoeOKxpNtmme0jI4g3yFGqv5GlAAk for deleting multiple devices at once in a single request.
 2017-03-13 16:33:51 +00:00
Erik Johnston
7eae6eaa2f Revert "Support registration & login with phone number" 2017-03-13 09:59:33 +00:00
Matthew Hodgson
a61dd408ed enable guest access for the 3pl/3pid APIs 2017-03-12 19:30:45 +00:00
David Baker
ece7e00048 Comment when our 3pids would be incomplete 2017-03-08 19:07:18 +00:00
David Baker
d4d3629aaf Better error message 2017-03-08 17:01:26 +00:00
David Baker
1c99934b28 pep8 2017-03-08 11:58:20 +00:00
David Baker
85bb322333 Pull out datastore in initialiser 2017-03-08 11:51:25 +00:00
David Baker
65d43f3ca5 Minor fixes from PR feedback 2017-03-08 11:48:43 +00:00
David Baker
82c5e7de25 Typos 2017-03-08 11:42:44 +00:00
David Baker
2e27339add Refector out assert_params_in_request 
and replace requestEmailToken where we meant requestMsisdnToken
 2017-03-08 11:37:34 +00:00
David Baker
88df6c0c9a Factor out msisdn canonicalisation 
Plus a couple of other minor fixes
 2017-03-08 11:03:39 +00:00
David Baker
402a7bf63d Fix pep8 2017-03-08 09:33:40 +00:00
David Baker
b0effa2160 Add msisdns as 3pids during registration 
and support binding them with the bind_msisdn param
 2017-03-03 18:34:39 +00:00
David Baker
ce3e583d94 WIP support for msisdn 3pid proxy methods 2017-02-14 15:05:55 +00:00
Erik Johnston
6826593b81 sets aren't JSON serializable 2017-02-02 14:55:54 +00:00
Erik Johnston
51adaac953 Fix email push in pusher worker 
This was broken when device list updates were implemented, as Mailer
could no longer instantiate an AuthHandler due to a dependency on
federation sending.
 2017-02-02 10:53:36 +00:00
Erik Johnston
7e919bdbd0 Include newly joined users in /keys/changes API 2017-02-01 17:33:16 +00:00
Erik Johnston
73d676dc8b Comment 2017-02-01 13:17:17 +00:00
Erik Johnston
acb501c46d Comment 2017-02-01 10:32:49 +00:00
Erik Johnston
97479d0c54 Implement /keys/changes 2017-02-01 10:30:03 +00:00
Erik Johnston
2367c5568c Add basic implementation of local device list changes 2017-01-25 14:27:27 +00:00
David Baker
8c5009b628 Lowercase all email addresses before querying db 
Since we store all emails in the DB in lowercase
(https://github.com/matrix-org/synapse/pull/1170)
 2017-01-18 13:25:56 +00:00
David Baker
0c88ab1844 Add /account/3pid/delete endpoint 
Also fix a typo in a comment
 2016-12-20 18:27:30 +00:00
Richard van der Hoff
abed247182 Remove unspecced GET endpoints for e2e keys 
GET /keys/claim is a terrible idea, since it isn't idempotent; also it throws
500 errors if you call it without all the right params.

GET /keys/query is arguable, but it's unspecced, so let's get rid of it too to
stop people relying on unspecced APIs.
 2016-12-12 12:31:40 +00:00
Richard van der Hoff
6841d8ff55 Fix doc-string 
Remove refresh_token reference
 2016-12-01 11:42:17 +00:00
Richard van der Hoff
aa09d6b8f0 Rip out more refresh_token code 
We might as well treat all refresh_tokens as invalid. Just return a 403 from
/tokenrefresh, so that we don't have a load of dead, untestable code hanging
around.

Still TODO: removing the table from the schema.
 2016-11-30 17:40:18 +00:00
Richard van der Hoff
dc4b23e1a1 Merge branch 'develop' into rav/no_more_refresh_tokens 2016-11-30 17:10:04 +00:00
Richard van der Hoff
77eca2487c Merge pull request #1653 from matrix-org/rav/guest_e2e 
Implement E2E for guests
 2016-11-29 17:41:35 +00:00
Richard van der Hoff
5c4edc83b5 Stop generating refresh tokens 
Since we're not doing refresh tokens any more, we should start killing off the
dead code paths. /tokenrefresh itself is a bit of a thornier subject, since
there might be apps out there using it, but we can at least not generate
refresh tokens on new logins.
 2016-11-28 10:13:01 +00:00
Richard van der Hoff
f62b69e32a Allow guest access to endpoints for E2E 
Expose /devices, /keys, and /sendToDevice to guest users, so that they can use
E2E.
 2016-11-25 15:26:34 +00:00
Richard van der Hoff
7f02e4d008 Give guest users a device_id 
We need to create devices for guests so that they can use e2e, but we don't
have anywhere to store it, so just use a fixed one.
 2016-11-25 15:25:30 +00:00
Erik Johnston
feec718265 Shuffle receipt handler around so that worker apps don't need to load it 2016-11-23 15:14:24 +00:00
Kegsay
d4a459f7cb Merge pull request #1638 from matrix-org/kegan/sync-event-fields 
Implement "event_fields" in filters
 2016-11-22 14:02:38 +00:00
Kegan Dougal
cea4e4e7b2 Glue only_event_fields into the sync rest servlet 2016-11-22 10:14:05 +00:00
Mark Haines
a289150943 Fix flake8 2016-11-18 17:15:02 +00:00
David Baker
544722bad2 Work around client replacing reg params 
Works around https://github.com/vector-im/vector-android/issues/715
and equivalent for iOS
 2016-11-18 17:07:35 +00:00
Kegan Dougal
3991b4cbdb Clean transactions based on time. Add HttpTransactionCache tests. 2016-11-14 11:19:24 +00:00
Kegan Dougal
af4a1bac50 Move .observe() up to the cache to make things neater 2016-11-14 09:52:41 +00:00
Kegan Dougal
8ecaff51a1 Review comments 2016-11-11 17:47:03 +00:00
Kegan Dougal
c7daf3136c Use observable deferreds because they are sane 2016-11-11 14:13:32 +00:00
Kegan Dougal
8a8ad46f48 Flake8 2016-11-10 15:22:11 +00:00
Kegan Dougal
2771447c29 Store Promise<Response> instead of Response for HTTP API transactions 
This fixes a race whereby:
 - User hits an endpoint.
 - No cached transaction so executes main code.
 - User hits same endpoint.
 - No cache transaction so executes main code.
 - Main code finishes executing and caches response and returns.
 - Main code finishes executing and caches response and returns.

 This race is common in the wild when Synapse is struggling under load.
 This commit fixes the race by:
  - User hits an endpoint.
  - Caches the promise to execute the main code and executes main code.
  - User hits same endpoint.
  - Yields on the same promise as the first request.
  - Main code finishes executing and returns, unblocking both requests.
 2016-11-10 14:49:26 +00:00