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lightwalletd
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parser: cache block heights from coinbase

This commit is contained in:
George Tankersley 2018-12-14 21:54:59 -05:00
parent 71c0624abe
commit a8e099d0fa
1 changed files with 6 additions and 1 deletions
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7
parser/block.go
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@ -11,10 +11,11 @@ import (
type block struct { type block struct {
hdr *blockHeader hdr *blockHeader
vtx []*Transaction vtx []*Transaction
height int
} }
func NewBlock() *block { func NewBlock() *block {
return &block{} return &block{height: -1}
} }
func (b *block) GetVersion() int { func (b *block) GetVersion() int {
@ -54,6 +55,9 @@ func (b *block) HasSaplingTransactions() bool {
// GetHeight() extracts the block height from the coinbase transaction. See // GetHeight() extracts the block height from the coinbase transaction. See
// BIP34. Returns block height on success, or -1 on error. // BIP34. Returns block height on success, or -1 on error.
func (b *block) GetHeight() int { func (b *block) GetHeight() int {
if b.height != -1 {
return b.height
}
coinbaseScript := bytestring.String(b.vtx[0].transparentInputs[0].ScriptSig) coinbaseScript := bytestring.String(b.vtx[0].transparentInputs[0].ScriptSig)
var heightByte byte var heightByte byte
if ok := coinbaseScript.ReadByte(&heightByte); !ok { if ok := coinbaseScript.ReadByte(&heightByte); !ok {
@ -70,6 +74,7 @@ func (b *block) GetHeight() int {
blockHeight <<= 8 blockHeight <<= 8
blockHeight = blockHeight | uint32(heightBytes[i]) blockHeight = blockHeight | uint32(heightBytes[i])
} }
b.height = int(blockHeight)
return int(blockHeight) return int(blockHeight)
} }