From b06aa1672a34746063319655136a343956d30ce9 Mon Sep 17 00:00:00 2001 From: Dave Collins Date: Mon, 23 Sep 2013 08:20:54 -0500 Subject: [PATCH] Initial implementation of IsCurrent func. This commit adds a new function, IsCurrent, which can be used to determine whether or not the chain believes it is current. Update. --- chain.go | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/chain.go b/chain.go index 157f02a2..9441b1fc 100644 --- a/chain.go +++ b/chain.go @@ -959,6 +959,38 @@ func (b *BlockChain) connectBestChain(node *blockNode, block *btcutil.Block) err return nil } +// IsCurrent returns whether or not the chain believes it is current. Several +// factors are used to guess, but the key factors that allow the chain to +// believe it is current are: +// - Latest block height is after the latest checkpoint (if enabled) +// - Latest block has a timestamp newer than 24 hours ago +// +// This function is NOT safe for concurrent access. +func (b *BlockChain) IsCurrent() bool { + // Not current if there isn't a main (best) chain yet. + if b.bestChain == nil { + return false + } + + // Not current if the latest main (best) chain height is before the + // latest known good checkpoint (when checkpoints are enabled). + checkpoint := b.LatestCheckpoint() + if checkpoint != nil && b.bestChain.height < checkpoint.Height { + return false + } + + // Not current if the latest best block has a timestamp before 24 hours + // ago. + now := time.Now() + if b.bestChain.timestamp.Before(now.Add(-24 * time.Hour)) { + return false + } + + // The chain appears to be current if the above checks did not report + // otherwise. + return true +} + // New returns a BlockChain instance for the passed bitcoin network using the // provided backing database. It accepts a callback on which notifications // will be sent when various events take place. See the documentation for