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SionoiS 2025-01-22 10:55:33 -05:00
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standards/core/sync.md
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@ -29,18 +29,18 @@ The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL
The protocol finds differences between two peers by The protocol finds differences between two peers by
comparing _fingerprints_ of _ranges_ of message _IDs_. comparing _fingerprints_ of _ranges_ of message _IDs_.
_Ranges_ are encoded into payloads, exchanged between the peers and when the range _fingerprints_ are different, split into smaller (sub)ranges. _Ranges_ are encoded into payloads, exchanged between the peers and when the range _fingerprints_ are different, split into smaller (sub)ranges.
This process repeats until _ranges_ include a small number of messages This process repeats until _ranges_ include a small number of messages.
at this point _IDs_ are sent for comparison instead of _fingerprints_. At this point lists of message _IDs_ are sent for comparison instead of _fingerprints_ over entire ranges of messages.
#### Overview #### Overview
The `reconciliation` protocol follows the following heuristic: The `reconciliation` protocol follows the following heuristic:
1. The requestor choose a time range to sync. 1. The requestor chooses a time range to sync.
2. The range is encoded into a payload and sent. 2. The range is encoded into a payload and sent.
3. The requestee receives the payload and decodes it. 3. The requestee receives the payload and decodes it.
4. The range is processed and, if a difference with the local range is detected, a set of subranges are produced. 4. The range is processed and, if a difference with the local range is detected, a set of subranges are produced.
5. The new ranges are encoded and sent. 5. The new ranges are encoded and sent.
6. Payloads are repeatedly exchanged and differences between the peers are discovered. 6. This process repeats while differences found are sent to the `transfer` protocol.
7. The synchronization is done when no ranges are left to process. 7. The synchronization ends when all ranges have been processed and no differences are left.
#### Message IDs #### Message IDs
Message _IDs_ MUST be composed of the timestamp and the hash of the [`14/WAKU2-MESSAGE`](https://rfc.vac.dev/waku/standards/core/14/message). Message _IDs_ MUST be composed of the timestamp and the hash of the [`14/WAKU2-MESSAGE`](https://rfc.vac.dev/waku/standards/core/14/message).
@ -75,10 +75,11 @@ recursing further reduce the number of round-trips.
#### Range Processing #### Range Processing
_Ranges_ have to be processed differently according to their types. _Ranges_ have to be processed differently according to their types.
- **Equal** _fingerprint ranges_ MUST become _skip ranges_. - _Fingerprint_ ranges MUST be compared.
- **Unequal** _fingerprint ranges_ MUST be splitted into smaller ranges. The new type MAY be either _fingerprint_ or _item set_. - **Equal** ranges MUST become _skip ranges_.
- **Unresolved** _item set_ ranges MUST be checked for differences and marked resolved. - **Unequal** ranges MUST be split into smaller _fingerprint_ or _item set_ ranges based on a implementation specific threshold.
- **Resolved** _item set_ ranges MUST be checked for differences and become skip ranges. - **Unresolved** _item set_ ranges MUST be compared, differences sent to the `transfer` protocol and marked resolved.
- **Resolved** _item set_ ranges MUST be compared, differences sent to the `transfer` protocol and become skip ranges.
- _Skip_ ranges MUST be merged with other consecutive _skip ranges_. - _Skip_ ranges MUST be merged with other consecutive _skip ranges_.
In the case where only skip ranges remains, the synchronization is done. In the case where only skip ranges remains, the synchronization is done.