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61 lines
2.0 KiB
Markdown
61 lines
2.0 KiB
Markdown
NIP-45
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======
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Event Counts
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--------------
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`draft` `optional`
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Relays may support the verb `COUNT`, which provides a mechanism for obtaining event counts.
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## Motivation
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Some queries a client may want to execute against connected relays are prohibitively expensive, for example, in order to retrieve follower counts for a given pubkey, a client must query all kind-3 events referring to a given pubkey only to count them. The result may be cached, either by a client or by a separate indexing server as an alternative, but both options erode the decentralization of the network by creating a second-layer protocol on top of Nostr.
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## Filters and return values
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This NIP defines the verb `COUNT`, which accepts a subscription id and filters as specified in [NIP 01](01.md) for the verb `REQ`. Multiple filters are OR'd together and aggregated into a single count result.
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```json
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["COUNT", <subscription_id>, <filters JSON>...]
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```
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Counts are returned using a `COUNT` response in the form `{"count": <integer>}`. Relays may use probabilistic counts to reduce compute requirements.
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In case a relay uses probabilistic counts, it MAY indicate it in the response with `approximate` key i.e. `{"count": <integer>, "approximate": <true|false>}`.
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```json
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["COUNT", <subscription_id>, {"count": <integer>}]
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```
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Whenever the relay decides to refuse to fulfill the `COUNT` request, it MUST return a `CLOSED` message.
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## Examples
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### Followers count
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```json
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["COUNT", <subscription_id>, {"kinds": [3], "#p": [<pubkey>]}]
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["COUNT", <subscription_id>, {"count": 238}]
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```
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### Count posts and reactions
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```json
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["COUNT", <subscription_id>, {"kinds": [1, 7], "authors": [<pubkey>]}]
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["COUNT", <subscription_id>, {"count": 5}]
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```
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### Count posts approximately
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```
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["COUNT", <subscription_id>, {"kinds": [1]}]
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["COUNT", <subscription_id>, {"count": 93412452, "approximate": true}]
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```
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### Relay refuses to count
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```
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["COUNT", <subscription_id>, {"kinds": [4], "authors": [<pubkey>], "#p": [<pubkey>]}]
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["CLOSED", <subscription_id>, "auth-required: cannot count other people's DMs"]
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```
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