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Merge #15508: Refactor analyzepsbt for use outside RPC code

Browse Source 
892eff05f1 Add documentation of struct PSBTAnalysis et al (Glenn Willen)
ef22fe8c1f Refactor analyzepsbt for use outside RPC code (Glenn Willen)
afd20a25f2 Move PSBT decoding functions from core_io to psbt.cpp (Glenn Willen)

Pull request description:

  Refactor the analyzepsbt RPC into (1) an AnalyzePSBT function, which returns
  its output as a new strongly-typed PSBTAnalysis struct, and (2) a thin wrapper
  which converts the struct into a UniValue for RPC use.

  ----

  As with my previous refactoring PR, I need this because I am creating a dependency on this code from the GUI. Per discussion in #bitcoin-core-dev on IRC, since we don't want to create a dependency on UniValue in anything outside RPC, I introduced some new structs to hold the info we get when analyzing a PSBT. For the field types, I used whatever types are already used internally for this data (e.g. CAmount, CFeeRate, CKeyID), and only convert to int/string etc. in the wrapper.

  @achow101, maybe take the first look? :-)

ACKs for commit 892eff:
  sipa:
    utACK 892eff05f1
  achow101:
    utACK 892eff05f1
  ryanofsky:
    utACK 892eff05f1. Just small cleanups since the last review: removing unneeded include, forward decl, adding const ref

Tree-SHA512: eb278b0a82717ebc3eb0c08dc5bb4eefb996a317a6a3a8ecf51cd88110ddbb188ad3482cdd9563e557995e73aca5a282c1f6e352bc598155f1203b7b46fe5dee
This commit is contained in:
Pieter Wuille
2019-04-06 08:51:41 -07:00
parent 35991b162f 892eff05f1
commit e439aeb30c
6 changed files with 252 additions and 165 deletions
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164
src/rpc/rawtransaction.cpp
View File

@@ -1943,148 +1943,56 @@ UniValue analyzepsbt(const JSONRPCRequest& request)
throw JSONRPCError(RPC_DESERIALIZATION_ERROR, strprintf("TX decode failed %s", error));
}
// Go through each input and build status
PSBTAnalysis psbta = AnalyzePSBT(psbtx);
UniValue result(UniValue::VOBJ);
UniValue inputs_result(UniValue::VARR);
bool calc_fee = true;
bool all_final = true;
bool only_missing_sigs = true;
bool only_missing_final = false;
CAmount in_amt = 0;
for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
PSBTInput& input = psbtx.inputs[i];
for (const auto& input : psbta.inputs) {
UniValue input_univ(UniValue::VOBJ);
UniValue missing(UniValue::VOBJ);
// Check for a UTXO
CTxOut utxo;
if (psbtx.GetInputUTXO(utxo, i)) {
in_amt += utxo.nValue;
input_univ.pushKV("has_utxo", true);
} else {
input_univ.pushKV("has_utxo", false);
input_univ.pushKV("is_final", false);
input_univ.pushKV("next", "updater");
calc_fee = false;
}
input_univ.pushKV("has_utxo", input.has_utxo);
input_univ.pushKV("is_final", input.is_final);
input_univ.pushKV("next", PSBTRoleName(input.next));
// Check if it is final
if (!utxo.IsNull() && !PSBTInputSigned(input)) {
input_univ.pushKV("is_final", false);
all_final = false;
// Figure out what is missing
SignatureData outdata;
bool complete = SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, 1, &outdata);
// Things are missing
if (!complete) {
if (!outdata.missing_pubkeys.empty()) {
// Missing pubkeys
UniValue missing_pubkeys_univ(UniValue::VARR);
for (const CKeyID& pubkey : outdata.missing_pubkeys) {
missing_pubkeys_univ.push_back(HexStr(pubkey));
}
missing.pushKV("pubkeys", missing_pubkeys_univ);
}
if (!outdata.missing_redeem_script.IsNull()) {
// Missing redeemScript
missing.pushKV("redeemscript", HexStr(outdata.missing_redeem_script));
}
if (!outdata.missing_witness_script.IsNull()) {
// Missing witnessScript
missing.pushKV("witnessscript", HexStr(outdata.missing_witness_script));
}
if (!outdata.missing_sigs.empty()) {
// Missing sigs
UniValue missing_sigs_univ(UniValue::VARR);
for (const CKeyID& pubkey : outdata.missing_sigs) {
missing_sigs_univ.push_back(HexStr(pubkey));
}
missing.pushKV("signatures", missing_sigs_univ);
}
input_univ.pushKV("missing", missing);
// If we are only missing signatures and nothing else, then next is signer
if (outdata.missing_pubkeys.empty() && outdata.missing_redeem_script.IsNull() && outdata.missing_witness_script.IsNull() && !outdata.missing_sigs.empty()) {
input_univ.pushKV("next", "signer");
} else {
only_missing_sigs = false;
input_univ.pushKV("next", "updater");
}
} else {
only_missing_final = true;
input_univ.pushKV("next", "finalizer");
if (!input.missing_pubkeys.empty()) {
UniValue missing_pubkeys_univ(UniValue::VARR);
for (const CKeyID& pubkey : input.missing_pubkeys) {
missing_pubkeys_univ.push_back(HexStr(pubkey));
}
} else if (!utxo.IsNull()){
input_univ.pushKV("is_final", true);
missing.pushKV("pubkeys", missing_pubkeys_univ);
}
if (!input.missing_redeem_script.IsNull()) {
missing.pushKV("redeemscript", HexStr(input.missing_redeem_script));
}
if (!input.missing_witness_script.IsNull()) {
missing.pushKV("witnessscript", HexStr(input.missing_witness_script));
}
if (!input.missing_sigs.empty()) {
UniValue missing_sigs_univ(UniValue::VARR);
for (const CKeyID& pubkey : input.missing_sigs) {
missing_sigs_univ.push_back(HexStr(pubkey));
}
missing.pushKV("signatures", missing_sigs_univ);
}
if (!missing.getKeys().empty()) {
input_univ.pushKV("missing", missing);
}
inputs_result.push_back(input_univ);
}
result.pushKV("inputs", inputs_result);
if (all_final) {
only_missing_sigs = false;
result.pushKV("next", "extractor");
if (psbta.estimated_vsize != nullopt) {
result.pushKV("estimated_vsize", (int)*psbta.estimated_vsize);
}
if (calc_fee) {
// Get the output amount
CAmount out_amt = std::accumulate(psbtx.tx->vout.begin(), psbtx.tx->vout.end(), CAmount(0),
[](CAmount a, const CTxOut& b) {
return a += b.nValue;
}
);
// Get the fee
CAmount fee = in_amt - out_amt;
// Estimate the size
CMutableTransaction mtx(*psbtx.tx);
CCoinsView view_dummy;
CCoinsViewCache view(&view_dummy);
bool success = true;
for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
PSBTInput& input = psbtx.inputs[i];
if (SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, 1, nullptr, true)) {
mtx.vin[i].scriptSig = input.final_script_sig;
mtx.vin[i].scriptWitness = input.final_script_witness;
Coin newcoin;
if (!psbtx.GetInputUTXO(newcoin.out, i)) {
success = false;
break;
}
newcoin.nHeight = 1;
view.AddCoin(psbtx.tx->vin[i].prevout, std::move(newcoin), true);
} else {
success = false;
break;
}
}
if (success) {
CTransaction ctx = CTransaction(mtx);
size_t size = GetVirtualTransactionSize(ctx, GetTransactionSigOpCost(ctx, view, STANDARD_SCRIPT_VERIFY_FLAGS));
result.pushKV("estimated_vsize", (int)size);
// Estimate fee rate
CFeeRate feerate(fee, size);
result.pushKV("estimated_feerate", ValueFromAmount(feerate.GetFeePerK()));
}
result.pushKV("fee", ValueFromAmount(fee));
if (only_missing_sigs) {
result.pushKV("next", "signer");
} else if (only_missing_final) {
result.pushKV("next", "finalizer");
} else if (all_final) {
result.pushKV("next", "extractor");
} else {
result.pushKV("next", "updater");
}
} else {
result.pushKV("next", "updater");
if (psbta.estimated_feerate != nullopt) {
result.pushKV("estimated_feerate", ValueFromAmount(psbta.estimated_feerate->GetFeePerK()));
}
if (psbta.fee != nullopt) {
result.pushKV("fee", ValueFromAmount(*psbta.fee));
}
result.pushKV("next", PSBTRoleName(psbta.next));
return result;
}