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client/authority-discovery: Limit number of connections to authorities (#4487)

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* client/authority-discovery: Limit number of connections to authorities

Instead of connecting to all sentry nodes of all authorities, with this
patch the authority discovery module does the following:

- Choose one sentry node per authority at random.

- Choose MAX_NUM_AUTHORITY_CONN out of the above at random.

The module uses randomness to prevent hot spots, e.g. all nodes trying
to connect to a single node. If the authority discovery module would
choose the nodes to connect to at random on each new address that it
learns of, the node would go through a lot of connection churn.  Instead
it creates a random seed at start up and uses this seed for its RNG on
each update cycle.

* client/authority-discovery: Extract address cache into own module

* client/authority-discovery/src/addr_cache: Add basic unit tests

* client/authority-discovery: Replace unwrap with expect on [u8] cmp

* .maintain/sentry-node/docker-compose.yml: Prefix endpoint flags

* client/authority-discovery/src/addr_cache: Use sort_unstable and cmp

* client/authority-discovery: Use BTreeMap in addr_cache for sorted iter

To reduce connection churn it is preferrable to have `get_subset` of the
`addr_cache` to return the same result on repeated calls. `get_subset`
iterates a map. To make the process of iteration deterministic, use a
`BTreeMap` instead of a `HashMap`.
This commit is contained in:
Max Inden
2020-01-03 21:40:19 +01:00
committed by Gavin Wood
parent fa1e42a2a1
commit 5cf682cece
7 changed files with 301 additions and 117 deletions
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substrate/Cargo.lock
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@@ -4933,9 +4933,10 @@ dependencies = [
"libp2p 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
"log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
"parity-scale-codec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
"prost 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
"prost-build 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
"quickcheck 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
"rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
"sc-client-api 2.0.0",
"sc-keystore 2.0.0",
"sc-network 0.8.0",