* client/network-gossip: Merge GossipEngine and GossipEngineInner
Given that GossipEngine and GossipEngineInner are not shared between
threads anyone (public interface + background tasks), neither depends on
being Send or Sync. Thus one can merge the two as done in this patch.
One only needs to wrap an `Arc<Mutex<>>` around the whole structure when
the owner (e.g. finality-grandpa) needs to share the gossip engine
between threads.
* client/finality-grandpa: Wrap GossipEngine in Arc Mutex & lock it on use
GossipEngine in itself has no need to be Send and Sync, given that it
does not rely on separately spawned background tasks anymore. Given that
finality-grandpa shares the `NetworkBridge` potentially between threads
its components need to be clonable, thus this patch wraps `GossipEngine`
in an `Arc<Mutex<>>`.
* Open one substream for each notifications protocol
* Fix WASM build
* Apply suggestions from code review
Co-Authored-By: Toralf Wittner <tw@dtex.org>
* Address concerns
* Use unsigned-varint to read the varint
* Use unsigned-varint
* Forgot Cargo.lock
Co-authored-by: Toralf Wittner <tw@dtex.org>
`GossipEngine` spawns two tasks, one for a periodic tick, one to forward
messages from the network to subscribers. These tasks hold an `Arc` to a
`GossipEngineInner`.
To reduce the amount of shared ownership (locking) this patch integrates
the two tasks into a `Future` implementation on the `GossipEngine`
struct. This `Future` implementation can now be called from a single
owner, e.g. the `finality-grandpa` `NetworkBridge`.
As a side effect this removes the requirement on the `network-gossip`
crate to spawn tasks and thereby removes the requirement on the
`finality-grandpa` crate to spawn any tasks.
This is part of a greater effort to reduce the number of owners of
components within `finality-grandpa`, `network` and `network-gossip` as
well as to reduce the amount of unbounded channels. For details see
d9837d7dd, 5f80929dc and 597c0a6c4.
* Remove usage of sc_network::Context trait
* Remove Context::send_consensus
* Pass &mut dyn Network instead of &dyn Network
* Move Validator traits and related to separate module
The finality-grandpa module needs two sets of functionalities from the
network:
1. Everything gossip related, e.g. event_stream, write_notification, ...
2. The ability to set a fork sync request for a specific block hash.
Instead of embedding (2) inside of (1) this patch extracts (2) from (1)
having finality-grandpa depend on a `Network` that fulfills the
`network_gossip::Network` trait and that can set block sync requests.
On the one hand this improves the overall structure splitting things
that don't logically belong together. On the other hand it does
reintroduce a lot of trait bounds within finality-grandpa.
Max Inden