Remove sync::Context trait. (#3105)

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Instead of passing a context around to each method, thereby introducing
side-effecting I/O actions everywhere, with this PR `sync::ChainSync`
only contains state which is updated by invoking various callback
methods (`on_*`) and actionable items are returned as regular results
from method calls, often iterators yielding requests that should be
issued to peers. It is up to the caller to handle these in an
appropriate way, currently `protocol` will send those as messages.

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Toralf Wittner authored and Gavin Wood committed 2019-07-12 20:37:38 +02:00

1 parent e4d4548121

commit 9ee79d5c5e

4 files changed

+902 -914

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substrate/core/network/src/protocol/sync.rs

+801 -796

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