# NIP-59: Relay Status

`draft` `optional` `author:dskvr`

This NIP defines `30303`, a parameterized replaceable event [NIP-33], referred to as Relay Statuses. Relay Statuses use tags extensively and **may** have `.content` populated with Stringified JSON.

## Purpose 
To store relay meta-data and the result of subjective checks as queryable [NIP-12] events on nostr. 

## Personas 
- **Publishers** generate and push `30303` events. Events **should** be published at a regular interval. Events **may** be stale.
- **Consumers** aggregate `30303` for insight on relays. Some example consumers are a social client or relay status client. 

## schema

### `event.created_at` 
`created_at` **should** be interpreted by consumers as `updated_at`

### `event.tags`
Relay status events have **two** (1) required tags and **eight** (8) optional tags. 

The tags should be used to represent the Relay's abilities and meta at a point in time. Below the `tags schema` is expressed using pseudo-types for reasons of communication and brevity, for example `tagDescriptor[]`.

1. `"d" == tagId[0]` The relay URL (`#d`). The `#d` tag **must** be included in the `event.tags[]` array. `tagId[1]` **must** be the relay websocket URL. The URL **should** be normalized. 
```json
["d", "wss://history.nostr.watch/"] //tagId[]
```
2. `"o" == tagOnline[0]` Is the relay online (`#o`). `tagOnline[]` **may** be included in the `event.tags[]` array. `tagOnline[1]` **should** be type string as exactly `true` or `false`
```json
["o", "true"] //tagOnline[]
```
3. `"r" == tagRead[0]` Was able to read from the relay. `tagRead[]` **may** be included in the `event.tags[]` array. `tagRead[1]` **should** be type string as exactly `true` or `false`
```json
["r", "true"] //tagRead[]
```
4. `"w" == tagWrite[0]` Was able to write to the relay. `tagWrite[]` **may** be included in the `event.tags[]` array. `tagWrite[1]` **should** be type string as exactly `true` or `false`
```json
["w", "false"] //tagWrite[]
```
5. `"s" == tagSsl[0]` Is the relay's SSL valid (`#s`). `tagSsl[]` **may** be included in the `event.tags[]` array. `tagSsl[1]` **should** be type string as exactly `true` or `false`
```json
["s", "true"] //tagSSL[]
```
6. `"t" == tagTopic[0]` Topics relavant to the relay. `tagTopic[]` **may** be included in the `event.tags[]` array. `tagTopic[1]` **should** be string
```json
["t", "bitcoin"] //tagTopic[]
```
7. `"g" == tagGeo[0]` Relay Geo Data. `tagGeo[]` **may** be included in the `event.tags[]` array. `tagGeo[1]` **must** be string. There **may** be strings defined in the key range `2-6` (`tagGeo[2-6]`) and they **must** be strings if set.
```json
["g", "Europe", "NE", "Amsterdam", "52.377956", "4.897070"] //tagGeo[]
```
8. `"x" == tagIPv4[0]` Relay IPv4. `tagIPv4[]` **may** be included in the `event.tags[]` array. `tagIPv4[1]` **must** be string.
```json
["x", "1.1.1.1"] //tagIPv4[]
```
9. `"y" == tagIPv6[0]` Relay IPv6. `tagIPv6[]` **may** be included in the `event.tags[]` array. `tagIPv6[1]` **must** be string.
```json
["y", "2001:db8:3333:4444:5555:6666:7777:8888"] //tagIPv6[]
```

Example Event: 
```json
{
  "id": "<eventid>",
  "pubkey": "",
  "created_at": "<created_at>",
  "signature": "<signature>",
  "content": "{}",
  "tags": [  
    ["d","wss://relay.snort.social/"],
    ["o","true"],
    ["r","true"],
    ["w","false"],
    ["s","true"],
    ["t","bitcoin"],
    ["t","nostrica"],
    ["g","Europe","NE","Amsterdam","52.377956","4.897070"],
    ["x", "1.1.1.1"],
    ["y", "2001:db8:3333:4444:5555:6666:7777:8888"]
  ]
}
```

### `event.content` _optional_
The `.content` of these events **may** be empty. `.content` **may** contain stringified JSON. The parsed JSON has a flexible schema, all members are optional. The parsed `.content` JSON **should** be extended by NIPs. 

## Testing Criteria
The testing criteria to determine conditions defined in event's tags **may** be subjective and **may** vary between publishers.

## Consumption
The data in `30303` **may** be erroneous, intentionally or otherwise. When accuracy is required, the data in `30303` events **should** be subscribed to by populating tthe `authors` filter array with the pubkeys of trusted **publishers**

## Use Cases 
- A lite social client identifies relays that were recently reported to be online without client-side tests
- A social client may find relays where a particular topic is popular.
- A social client may find relays based on their geographic proximity
- A status client shows relay statuses
- Identify macro-patterns amongst relays. 
- Relays self-report statuses and/or metadata in `.content` signed by their NIP-11 `pubkey`.
- Could be used to store user checks for a relay to express personalized policies. For example, a user's pubkey was blacklisted on a relay, so they were unable to write: `..., tags: { [ ["d","wss://relay.damus.io"], ["o","true"], ["w","false"] ] }, ...`.