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Merge #15463: rpc: Speedup getaddressesbylabel

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710a7136f9 rpc: Speedup getaddressesbylabel (João Barbosa)

Pull request description:

  Fixes #15447. Same approach of #14984, this change avoids duplicate key check when building the JSON response in memory.

ACKs for commit 710a71:
  MarcoFalke:
    utACK 710a7136f9
  ryanofsky:
    utACK 710a7136f9. Just new comments and assert since last review.

Tree-SHA512: 77c95df9ff3793e348619aa070e6fd36df9da1b461d708ab146652cb3699f1a472ef6eb38dafdb8374375cbc97daef07635fcb0501961f167a023309513742e2
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MarcoFalke 2019-04-23 10:59:39 -04:00
commit cd14d210c4
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1 changed files with 12 additions and 1 deletions
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13
src/wallet/rpcwallet.cpp
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@ -3683,9 +3683,20 @@ static UniValue getaddressesbylabel(const JSONRPCRequest& request)
// Find all addresses that have the given label
UniValue ret(UniValue::VOBJ);
std::set<std::string> addresses;
for (const std::pair<const CTxDestination, CAddressBookData>& item : pwallet->mapAddressBook) {
if (item.second.name == label) {
ret.pushKV(EncodeDestination(item.first), AddressBookDataToJSON(item.second, false));
std::string address = EncodeDestination(item.first);
// CWallet::mapAddressBook is not expected to contain duplicate
// address strings, but build a separate set as a precaution just in
// case it does.
bool unique = addresses.emplace(address).second;
assert(unique);
// UniValue::pushKV checks if the key exists in O(N)
// and since duplicate addresses are unexpected (checked with
// std::set in O(log(N))), UniValue::__pushKV is used instead,
// which currently is O(1).
ret.__pushKV(address, AddressBookDataToJSON(item.second, false));
}
}