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Add proposal spec for PollRange API endpoint

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Alex Auvolat 2023-01-10 14:56:57 +01:00
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doc/drafts/k2v-spec.md
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@ -706,6 +706,63 @@ HTTP/1.1 200 OK
]
```
**PollRange: `POST /<bucket>/<partition key>?poll_range`**, or alternatively<br/>
**PollRange: `SEARCH /<bucket>/<partition key>?poll_range`**
Polls a range of items for changes.
The query body is a JSON object consisting of the following fields:
| name | default value | meaning |
|-----------------|---------------|----------------------------------------------------------------------------------------|
| `prefix` | `null` | Restrict items to poll to those whose sort keys start with this prefix |
| `start` | `null` | The sort key of the first item to poll |
| `end` | `null` | The sort key of the last item to poll (excluded) |
| `timeout` | 300 | The timeout before 304 NOT MODIFIED is returned if no value in the range is updated |
| `seenMarker` | `null` | An opaque string returned by a previous PollRange call, that represents items already seen |
The timeout can be set to any number of seconds, with a maximum of 600 seconds (10 minutes).
The response is either:
- A HTTP 304 NOT MODIFIED response with an empty body, if the timeout expired and no changes occurred
- A HTTP 200 response, indicating that some changes have occurred since the last PollRange call, in which case a JSON object is returned in the body with the following fields:
| name | meaning |
|-----------------|----------------------------------------------------------------------------------------|
| `seenMarker` | An opaque string that represents items already seen for future PollRange calls |
| `items` | The list of items that have changed since last PollRange call, in the same format as ReadBatch |
Example query:
```json
SEARCH /my_bucket?poll_range HTTP/1.1
{
"prefix": "0391.",
"start": "0391.000001973107",
"seenMarker": "opaquestring123",
}
```
Example response:
```json
HTTP/1.1 200 OK
Content-Type: application/json
{
"seenMarker": "opaquestring456",
"items": [
{ sk: "0391.000001973221", ct: "opaquetoken123", v: ["b64cryptoblob123", "b64cryptoblob'123"] },
{ sk: "0391.000001974191", ct: "opaquetoken456", v: ["b64cryptoblob456", "b64cryptoblob'456"] },
]
}
```
## Internals: causality tokens