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Igor Matuszewski 028f3d2674 Merge 2.0.1 backport branch into mainline master (#7842 )

* Backport paritytech/substrate#7381

* Bring back genesis storage build in aura/timestamp

To not change spec version, see
https://github.com/paritytech/substrate/pull/7686#discussion_r540032743

* Backport paritytech/substrate#7238

* Backport paritytech/substrate#7395

* Bump impl_version

* Fix UI tests and bump trybuild dep

See https://github.com/rust-lang/rust/pull/73996

Backports:
https://github.com/paritytech/substrate/pull/7764
https://github.com/paritytech/substrate/pull/7656

* Partially backport paritytech/substrate#7838

* Release frame-support with a dep compilation fix

* Bump patch level for remaining crates

This is done because at the time of writing cargo-unleash does not fully
support partial workspace publishing and mixes both local and crates.io
versions of the packages, leading to errors in the release check workflow.

* Backport paritytech/substrate#7854

...to fix compilation error when using futures-* v0.3.9.

* Adding Changelog  entry for patch release

Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Benjamin Kampmann <ben@parity.io>

2021-01-11 11:24:29 +01:00

src

Rework priority groups, take 2 (#7700 )

2021-01-07 13:52:39 +00:00

Cargo.toml

Merge 2.0.1 backport branch into mainline master (#7842 )

2021-01-11 11:24:29 +01:00

README.md

prepping for releasing rc6 (#6922 )

2020-08-20 17:04:42 +02:00

README.md

Polite gossiping.

This crate provides gossiping capabilities on top of a network.

Gossip messages are separated by two categories: "topics" and consensus engine ID. The consensus engine ID is sent over the wire with the message, while the topic is not, with the expectation that the topic can be derived implicitly from the content of the message, assuming it is valid.

Topics are a single 32-byte tag associated with a message, used to group those messages in an opaque way. Consensus code can invoke broadcast_topic to attempt to send all messages under a single topic to all peers who don't have them yet, and send_topic to send all messages under a single topic to a specific peer.

Usage

Implement the Network trait, representing the low-level networking primitives. It is already implemented on sc_network::NetworkService.
Implement the Validator trait. See the section below.
Decide on a ConsensusEngineId. Each gossiping protocol should have a different one.
Build a GossipEngine using these three elements.
Use the methods of the GossipEngine in order to send out messages and receive incoming messages.

What is a validator?

The primary role of a Validator is to process incoming messages from peers, and decide whether to discard them or process them. It also decides whether to re-broadcast the message.

The secondary role of the Validator is to check if a message is allowed to be sent to a given peer. All messages, before being sent, will be checked against this filter. This enables the validator to use information it's aware of about connected peers to decide whether to send messages to them at any given moment in time - In particular, to wait until peers can accept and process the message before sending it.

Lastly, the fact that gossip validators can decide not to rebroadcast messages opens the door for neighbor status packets to be baked into the gossip protocol. These status packets will typically contain light pieces of information used to inform peers of a current view of protocol state.

License: GPL-3.0-or-later WITH Classpath-exception-2.0