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frame/authority-discovery: Have authorities() return both current and next (#6788)

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* frame/authority-discovery: Have authorities() return both current and next

Authority address lookups on the DHT happen periodically (every 10
mintues) and are rather slow (~10 seconds).

In order to smooth the transition period between two sessions, have the
runtime module return both the current as well as the next authority
set. Thereby the client authority module will:

1. Publish its addresses one session in advance.

2. Prefetch the addresses of authorities of the next session in advance.

* frame/authority-discovery: Deduplicate authority ids

* frame/authority-discovery: Don't dedup on_genesis authorities

* frame/authority-discovery: Remove mut and sort on comparison in tests

* frame/authority-discovery: Use BTreeSet for deduplication
This commit is contained in:
Max Inden
2020-09-02 17:20:51 +02:00
committed by GitHub
parent 2f9e2577c1
commit 1d10db3184
3 changed files with 71 additions and 29 deletions
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substrate/primitives/authority-discovery/src/lib.rs
+2 -2
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@@ -45,9 +45,9 @@ sp_api::decl_runtime_apis! {
/// The authority discovery api.
///
/// This api is used by the `client/authority-discovery` module to retrieve identifiers
/// of the current authority set.
/// of the current and next authority set.
pub trait AuthorityDiscoveryApi {
/// Retrieve authority identifiers of the current authority set.
/// Retrieve authority identifiers of the current and next authority set.
fn authorities() -> Vec<AuthorityId>;
}
}