Add spec for getting events by timestamp (#1366)

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Hubert Chathi 2 years ago committed by GitHub
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@ -0,0 +1 @@
Add `/rooms/<roomID>/timestamp_to_event` endpoint, as per [MSC3030](https://github.com/matrix-org/matrix-spec-proposals/pull/3030).

@ -0,0 +1 @@
Add `/timestamp_to_event/<roomID>` endpoint, as per [MSC3030](https://github.com/matrix-org/matrix-spec-proposals/pull/3030).

@ -1818,6 +1818,8 @@ There are several APIs provided to `GET` events for a room:
{{% http-api spec="client-server" api="message_pagination" %}}
{{% http-api spec="client-server" api="room_event_by_timestamp" %}}
{{% http-api spec="client-server" api="room_initial_sync" %}}
### Sending events to a room

@ -0,0 +1,123 @@
# Copyright 2022 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
swagger: '2.0'
info:
title: "Matrix Client-Server events in room by date API"
version: "1.0.0"
host: localhost:8008
schemes:
- https
- http
basePath: /_matrix/client/v1
consumes:
- application/json
produces:
- application/json
securityDefinitions:
$ref: definitions/security.yaml
paths:
"/rooms/{roomId}/timestamp_to_event":
get:
x-addedInMatrixVersion: "1.6"
summary: Get the closest event ID to the given timestamp
description: |-
Get the ID of the event closest to the given timestamp, in the
direction specified by the `dir` parameter.
If the server does not have all of the room history and does not have
an event suitably close to the requested timestamp, it can use the
corresponding [federation endpoint](/server-server-api/#get_matrixfederationv1timestamp_to_eventroomid)
to ask other servers for a suitable event.
After calling this endpoint, clients can call
[`/rooms/{roomId}/context/{eventId}`](#get_matrixclientv3roomsroomidcontexteventid)
to obtain a pagination token to retrieve the events around the returned event.
The event returned by this endpoint could be an event that the client
cannot render, and so may need to paginate in order to locate an event
that it can display, which may end up being outside of the client's
suitable range. Clients can employ different strategies to display
something reasonable to the user. For example, the client could try
paginating in one direction for a while, while looking at the
timestamps of the events that it is paginating through, and if it
exceeds a certain difference from the target timestamp, it can try
paginating in the opposite direction. The client could also simply
paginate in one direction and inform the user that the closest event
found in that direction is outside of the expected range.
operationId: getEventByTimestamp
security:
- accessToken: []
parameters:
- in: path
type: string
name: roomId
description: The ID of the room to search
required: true
x-example: "!636q39766251:matrix.org"
- in: query
type: integer
name: ts
description: |-
The timestamp to search from, as given in milliseconds
since the Unix epoch.
required: true
x-example: 1432684800000
- in: query
type: string
enum: [f, b]
name: dir
description: |-
The direction in which to search. `f` for forwards, `b` for backwards.
required: true
x-example: f
responses:
200:
description: |-
An event was found matching the search parameters.
schema:
type: object
properties:
event_id:
type: string
description: |-
The ID of the event found
origin_server_ts:
type: integer
description: |-
The event's timestamp, in milliseconds since the Unix epoch.
This makes it easy to do a quick comparison to see if the
`event_id` fetched is too far out of range to be useful for your
use case.
required: ['event_id', 'origin_server_ts']
examples:
application/json: {
"event_id": "$143273582443PhrSn:example.org",
"origin_server_ts": 1432735824653
}
404:
description: |-
No event was found.
examples:
application/json: {
"errcode": "M_NOT_FOUND",
"error": "Unable to find event from 1432684800000 in forward direction"
}
schema:
"$ref": "definitions/errors/error.yaml"
429:
description: This request was rate-limited.
schema:
"$ref": "definitions/errors/rate_limited.yaml"
tags:
- Room participation

@ -1,4 +1,4 @@
# Copyright 2018 New Vector Ltd
# Copyright 2018-2020 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -157,3 +157,89 @@ paths:
description: A transaction containing a single PDU which is the event requested.
schema:
$ref: "definitions/single_pdu_transaction.yaml"
"/timestamp_to_event/{roomId}":
get:
summary: Get the closest event ID to the given timestamp
x-addedInMatrixVersion: "1.6"
description: |-
Get the ID of the event closest to the given timestamp, in the
direction specified by the `dir` parameter.
This is primarily used when handling the corresponding
[client-server endpoint](/client-server-api/#get_matrixclientv1roomsroomidtimestamp_to_event)
when the server does not have all of the room history, and does not
have an event suitably close to the requested timestamp.
The heuristics for deciding when to ask another homeserver for a closer
event if your homeserver doesn't have something close, are left up to
the homeserver implementation, although the heuristics will probably be
based on whether the closest event is a forward/backward extremity
indicating it's next to a gap of events which are potentially closer.
A good heuristic for which servers to try first is to sort by servers
that have been in the room the longest because they're most likely to
have anything we ask about.
After the local homeserver receives the response, it should determine,
using the `origin_server_ts` property, whether the returned event is
closer to the requested timestamp than the closest event that it could
find locally. If so, it should try to backfill this event via the
[`/event/{event_id}`](#get_matrixfederationv1eventeventid) endpoint so
that it is available to for a client to query.
operationId: getEventByTimestamp
security:
- accessToken: []
parameters:
- in: path
type: string
name: roomId
description: The ID of the room to search
required: true
x-example: "!636q39766251:matrix.org"
- in: query
type: integer
name: ts
description: |-
The timestamp to search from, as given in milliseconds
since the Unix epoch.
required: true
x-example: 1432684800000
- in: query
type: string
enum: [f, b]
name: dir
description: |-
The direction in which to search. `f` for forwards, `b` for backwards.
required: true
x-example: f
responses:
200:
description: |-
An event was found matching the search parameters.
schema:
type: object
properties:
event_id:
type: string
description: |-
The ID of the event found
origin_server_ts:
type: integer
description: |-
The event's timestamp, in milliseconds since the Unix epoch.
required: ['event_id', 'origin_server_ts']
examples:
application/json: {
"event_id": "$143273582443PhrSn:example.org",
"origin_server_ts": 1432735824653
}
404:
description: |-
No event was found.
examples:
application/json: {
"errcode": "M_NOT_FOUND",
"error": "Unable to find event from 1432684800000 in forward direction"
}
schema:
"$ref": "../client-server/definitions/errors/error.yaml"

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