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[GossipSub 1.2] IDONTWANT control message (#548)

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* Add draft DONTSEND Gossip control message spec

* Rename DONTSEND to IDONTWANT

* Use the proper SHOULD and MAY wordings

* gossipsub v1.2 scaffolding

* Add authors and interest group members

* Remove potential use cases which may potentially lead to amplification

* Minor rephrasing with MAY/SHOULD

* Change SHOULD to MUST according to discussion in comments

* Make the ControlIDontWant.messageIDs plural to be consistent with IHAVE and IWANT messages

Co-authored-by: Pop Chunhapanya <haxx.pop@gmail.com>

* Change filed name to lower case for consistency with original spec

Co-authored-by: João Oliveira <hello@jxs.pt>

---------

Co-authored-by: vyzo <vyzo@hackzen.org>
Co-authored-by: Pop Chunhapanya <haxx.pop@gmail.com>
Co-authored-by: João Oliveira <hello@jxs.pt>
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Anton Nashatyrev
2024-05-15 18:25:18 +03:00
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# gossipsub v1.2: TODO
| Lifecycle Stage | Maturity | Status | Latest Revision |
|-----------------|---------------------------|--------|-----------------|
| 1A | Working Draft | Active | r1, 2023-07-14 |
Authors: [@Nashatyrev], [@Menduist]
Interest Group: [@vyzo], [@Nashatyrev], [@Menduist]
[@vyzo]: https://github.com/vyzo
[@Nashatyrev]: https://github.com/Nashatyrev
[@Menduist]: https://github.com/Menduist
See the [lifecycle document][lifecycle-spec] for context about maturity level and spec status.
[lifecycle-spec]: https://github.com/libp2p/specs/blob/master/00-framework-01-spec-lifecycle.md
# Overview
This document aims to provide a minimal extension to the [gossipsub
v1.1](https://github.com/libp2p/specs/blob/master/pubsub/gossipsub/gossipsub-v1.1.md)
protocol.
The proposed extensions are backwards-compatible and aim to enhance the
efficiency (minimize amplification/duplicates and decrease message latency) of
the gossip mesh networks for larger messages.
In more specific terms, a new control message is introduced: `IDONTWANT`. It's primarily
intended to notify mesh peers that the node already received a message and there is no
need to send its duplicate.
# Specification
## Protocol Id
Nodes that support this Gossipsub extension should additionally advertise the
version number `1.2.0`. Gossipsub nodes can advertise their own protocol-id
prefix, by default this is `meshsub` giving the default protocol id:
- `/meshsub/1.2.0`
## Parameters
This section lists the configuration parameters that needs to agreed on across clients to avoid
peer penalizations
| Parameter | Description | Reasonable Default |
|--------------------------|------------------------------------------------------------------|--------------|
| `max_idontwant_messages` | The maximum number of `IDONTWANT` messages per heartbeat per peer | ??? |
## IDONTWANT Message
### Basic scenario
When the peer receives the first message instance it immediately broadcasts
(not queue for later piggybacking) `IDONTWANT` with the `messageId` to all its mesh peers.
This could be performed prior to the message validation to further increase the effectiveness of the approach.
On the other side a node maintains per-peer `dont_send_message_ids` set. Upon receiving `IDONTWANT` from
a peer the `messageId` is added to the `dont_send_message_ids` set.
When later relaying the `messageId` message to the mesh the peers found in `dont_send_message_ids` MUST be skipped.
Old entries from `dont_send_message_ids` SHOULD be pruned during heartbeat processing.
The prune strategy is outside of the spec scope and can be decided by implementations.
`IDONTWANT` message is supposed to be _optional_ for both receiver and sender. I.e. the sender MAY NOT utilize
this message. The receiver in turn MAY ignore `IDONTWANT`: sending a message after the corresponding `IDONTWANT`
should not be penalized.
The `IDONTWANT` may have negative effect on small messages as it may increase the overall traffic and CPU load.
Thus it is better to utilize `IDONTWANT` for messages of a larger size.
The exact policy of `IDONTWANT` appliance is outside of the spec scope. Every implementation MAY choose whatever
is more appropriate for it. Possible options are either choose a message size threshold and broadcast `IDONTWANT`
on per message basis when the size is exceeded or just use `IDONTWANT` for all messages on selected topics.
To prevent DoS the number of `IDONTWANT` control messages is limited to `max_idontwant_messages` per heartbeat
### Cancelling `IWANT`
If a node requested a message via `IWANT` and then occasionally receives the message from other peer it MAY
try to cancel its `IWANT` requests with the corresponding `IDONTWANT` message. It may work in cases when a
peer delays/queues `IWANT` requests and the `IWANT` request SHOULD be removed from the queue if not processed yet
## Protobuf Extension
The protobuf messages are identical to those specified in the [gossipsub v1.0.0
specification](https://github.com/libp2p/specs/blob/master/pubsub/gossipsub/gossipsub-v1.0.md)
with the following control message modifications:
```protobuf
message RPC {
// ... see definition in the gossipsub specification
}
message ControlMessage {
// messages from v1.0
repeated ControlIDontWant idontwant = 5;
}
message ControlIDontWant {
repeated bytes messageIDs = 1;
}
```