Adrian Catangiu
81a02cb7c4
`futures_util::pending!()` macro only yields to the event loop once, resulting in many calls to the `OnDemandJustificationsEngine::next()` made by the tokio reactor even though the on-demand-engine is idle. Replace it with the correct `futures::future::pending::<()>()` function which forever yields to the event loop, which is what we want when the engine is idle. Signed-off-by: Adrian Catangiu <adrian@parity.io>
Substrate · 
Substrate is a next-generation framework for blockchain innovation 🚀.
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The reason for the split-licensing is to ensure that for the vast majority of teams using Substrate to create feature-chains, then all changes can be made entirely in Apache2-licensed code, allowing teams full freedom over what and how they release and giving licensing clarity to commercial teams.
In the interests of the community, we require any deeper improvements made to Substrate's core logic (e.g. Substrate's internal consensus, crypto or database code) to be contributed back so everyone can benefit.