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rpc: skip rescan if client has no addresses or UTXOs

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In this commit, we implement an optimization that will speed up clients
that attempt to perform a rescan in the past with no addresses. If the
client doesn't have any thing to search for, then we simply exit early
and send them a rescan finished notification with the final block in our
chain.
This commit is contained in:
Olaoluwa Osuntokun 2019-06-28 15:45:20 -07:00
parent 594e2ab48a
commit 18c37d2eb7
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1 changed files with 21 additions and 0 deletions
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21
rpcwebsocket.go
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@ -2588,6 +2588,11 @@ func handleRescan(wsc *wsClient, icmd interface{}) (interface{}, error) {
} }
} }
var (
lastBlock *btcutil.Block
lastBlockHash *chainhash.Hash
)
if len(lookups.addrs) != 0 || len(lookups.unspent) != 0 {
// With all the arguments parsed, we'll execute our chunked rescan // With all the arguments parsed, we'll execute our chunked rescan
// which will notify the clients of any address deposits or output // which will notify the clients of any address deposits or output
// spends. // spends.
@ -2597,6 +2602,22 @@ func handleRescan(wsc *wsClient, icmd interface{}) (interface{}, error) {
if err != nil { if err != nil {
return nil, err return nil, err
} }
} else {
rpcsLog.Infof("Skipping rescan as client has no addrs/utxos")
// If we didn't actually do a rescan, then we'll give the
// client our best known block within the final rescan finished
// notification.
chainTip := chain.BestSnapshot()
lastBlockHash = &chainTip.Hash
lastBlock, err = chain.BlockByHash(lastBlockHash)
if err != nil {
return nil, &btcjson.RPCError{
Code: btcjson.ErrRPCBlockNotFound,
Message: "Error getting block: " + err.Error(),
}
}
}
// Notify websocket client of the finished rescan. Due to how btcd // Notify websocket client of the finished rescan. Due to how btcd
// asynchronously queues notifications to not block calling code, // asynchronously queues notifications to not block calling code,