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Add waku2 field definition (#472)

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Hanno Cornelius 2021-11-11 10:04:18 +01:00 committed by GitHub
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@ -51,7 +51,7 @@ Directly storing one or several multiaddresses in the ENR would fix the issues l
# `multiaddrs` ENR key
We propose the definition of the `multiaddrs` key.
We define a `multiaddrs` key.
- The value MUST be a list of binary encoded multiaddr prefixed by their size.
- The size of the multiaddr MUST be encoded in a Big Endian unsigned 16-bit integer.
@ -118,8 +118,42 @@ Supported key type is `secp256k1` only.
In the future, an extension of this RFC could be made to support other elliptic curve cryptography such as `ed25519`.
# `waku2` ENR key
We define a `waku2` field key:
- The value MUST be an 8-bit flag field,
where bits set to `1` indicate `true` and bits set to `0` indicate `false` for the relevant flags.
- The flag values already defined are set out below,
with `bit 7` the most significant bit and `bit 0` the least significant bit.
| bit 7 | bit 6 | bit 5 | bit 4 | bit 3 | bit 2 | bit 1 | bit 0 |
| --- | --- | --- | --- | --- | --- | --- | --- |
| `undef` | `undef` | `undef` | `undef` | `lightpush` | `filter` | `store` | `relay` |
- In the scheme above, the flags `lightpush`, `filter`, `store` and `relay` correlates with support for protocols with the same name.
If a protocol is not supported, the corresponding field MUST be set to `false`.
Indicating positive support for any specific protocol is OPTIONAL,
though it MAY be required by the relevant application or discovery process.
- Flags marked as `undef` is not yet defined.
These SHOULD be set to `false` by default.
## Usage
- A Waku v2 node MAY choose to populate the `waku2` field for enhanced discovery capabilities,
such as indicating supported protocols.
Such a node MAY indicate support for any specific protocol by setting the corresponding flag to `true`.
- Waku v2 nodes that want to participate in [Node Discovery Protocol v5](https://github.com/ethereum/devp2p/blob/master/discv5/discv5.md) [[4]](#references), however,
MUST implement the `waku2` key with at least one flag set to `true`.
- Waku v2 nodes that discovered other participants using Discovery v5,
MUST filter out participant records that do not implement this field or do not have at least one flag set to `true`.
- In addition, such nodes MAY choose to filter participants on specific flags (such as supported protocols),
or further interpret the `waku2` field as required by the application.
# References
- [1] https://github.com/status-im/nim-waku/pull/690
- [2] https://github.com/vacp2p/rfc/issues/462#issuecomment-943869940
- [3] https://eips.ethereum.org/EIPS/eip-778
- [4] https://github.com/ethereum/devp2p/blob/master/discv5/discv5.md