// ... or I'm gonna fade away
func (t *TxStore) GimmeFilter() (*bloom.Filter, error) {
if len(t.Adrs) == 0 {
return nil, fmt.Errorf("no address to filter for")
}
// get all utxos to add outpoints to filter
allUtxos, err := t.GetAllUtxos()
if err != nil {
return nil, err
}
elem := uint32(len(t.Adrs) + len(allUtxos))
f := bloom.NewFilter(elem, 0, 0.000001, wire.BloomUpdateAll)
// note there could be false positives since we're just looking
// for the 20 byte PKH without the opcodes.
for _, a := range t.Adrs { // add 20-byte pubkeyhash
f.Add(a.PkhAdr.ScriptAddress())
}
for _, u := range allUtxos {
f.AddOutPoint(&u.Op)
}
return f, nil
}
func (ts *TxStore) Refilter() error {
allUtxos, err := ts.GetAllUtxos()
if err != nil {
return err
}
filterElements := uint32(len(allUtxos) + len(ts.Adrs))
ts.localFilter = bloom.NewFilter(filterElements, 0, 0, wire.BloomUpdateAll)
for _, u := range allUtxos {
ts.localFilter.AddOutPoint(&u.Op)
}
for _, a := range ts.Adrs {
ts.localFilter.Add(a.PkhAdr.ScriptAddress())
}
msg := ts.localFilter.MsgFilterLoad()
fmt.Printf("made %d element filter: %x\n", filterElements, msg.Filter)
return nil
}