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chainntnfs: allow clients to pass in best block

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Clients can optionally pass their best block known into RegisterBlockEpochNtfn. This enables the notifiers to catch up clients on blocks they may have missed.
This commit is contained in:
Valentine Wallace
2018-08-09 00:05:27 -07:00
parent 6989316b11
commit 71a81f59a9
4 changed files with 41 additions and 10 deletions
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7
chainntnfs/interface.go
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@@ -59,7 +59,12 @@ type ChainNotifier interface {
// new block connected to the tip of the main chain. The returned
// BlockEpochEvent struct contains a channel which will be sent upon
// for each new block discovered.
RegisterBlockEpochNtfn() (*BlockEpochEvent, error)
//
// Clients have the option of passing in their best known block.
// If they specify a block, the ChainNotifier checks whether the client
// is behind on blocks. If they are, the ChainNotifier sends a backlog
// of block notifications for the missed blocks.
RegisterBlockEpochNtfn(*BlockEpoch) (*BlockEpochEvent, error)
// Start the ChainNotifier. Once started, the implementation should be
// ready, and able to receive notification registrations from clients.