rpc: Add level 3 verbosity to getblock RPC call.

Display the prevout in transaction inputs when calling getblock level 3
verbosity.

Co-authored-by: Luke Dashjr <luke_github1@dashjr.org>
Co-authored-by: 0xB10C <19157360+0xB10C@users.noreply.github.com>

src/bench/rpc_blockchain.cpp

@@ -40,7 +40,7 @@ static void BlockToJsonVerbose(benchmark::Bench& bench)
 {
     TestBlockAndIndex data;
     bench.run([&] {
-        auto univalue = blockToJSON(data.block, &data.blockindex, &data.blockindex, TxVerbosity::SHOW_DETAILS);
+        auto univalue = blockToJSON(data.block, &data.blockindex, &data.blockindex, TxVerbosity::SHOW_DETAILS_AND_PREVOUT);
         ankerl::nanobench::doNotOptimizeAway(univalue);
     });
 }
@@ -50,7 +50,7 @@ BENCHMARK(BlockToJsonVerbose);
 static void BlockToJsonVerboseWrite(benchmark::Bench& bench)
 {
     TestBlockAndIndex data;
-    auto univalue = blockToJSON(data.block, &data.blockindex, &data.blockindex, TxVerbosity::SHOW_DETAILS);
+    auto univalue = blockToJSON(data.block, &data.blockindex, &data.blockindex, TxVerbosity::SHOW_DETAILS_AND_PREVOUT);
     bench.run([&] {
         auto str = univalue.write();
         ankerl::nanobench::doNotOptimizeAway(str);

src/core_io.h

@@ -25,7 +25,8 @@ class CTxUndo;
  */
 enum class TxVerbosity {
     SHOW_TXID,                //!< Only TXID for each block's transaction
-    SHOW_DETAILS             //!< Include TXID, inputs, outputs, and other common block's transaction information
+    SHOW_DETAILS,             //!< Include TXID, inputs, outputs, and other common block's transaction information
+    SHOW_DETAILS_AND_PREVOUT  //!< The same as previous option with information about prevouts if available
 };
 
 // core_read.cpp
@@ -54,6 +55,6 @@ std::string EncodeHexTx(const CTransaction& tx, const int serializeFlags = 0);
 std::string SighashToStr(unsigned char sighash_type);
 void ScriptPubKeyToUniv(const CScript& scriptPubKey, UniValue& out, bool include_hex, bool include_address = true);
 void ScriptToUniv(const CScript& script, UniValue& out);
-void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex = true, int serialize_flags = 0, const CTxUndo* txundo = nullptr);
+void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex = true, int serialize_flags = 0, const CTxUndo* txundo = nullptr, TxVerbosity verbosity = TxVerbosity::SHOW_DETAILS);
 
 #endif // BITCOIN_CORE_IO_H

src/core_write.cpp

@@ -163,7 +163,7 @@ void ScriptPubKeyToUniv(const CScript& scriptPubKey, UniValue& out, bool include
     out.pushKV("type", GetTxnOutputType(type));
 }
 
-void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex, int serialize_flags, const CTxUndo* txundo)
+void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry, bool include_hex, int serialize_flags, const CTxUndo* txundo, TxVerbosity verbosity)
 {
     entry.pushKV("txid", tx.GetHash().GetHex());
     entry.pushKV("hash", tx.GetWitnessHash().GetHex());
@@ -204,8 +204,27 @@ void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry,
             in.pushKV("txinwitness", txinwitness);
         }
         if (calculate_fee) {
-            const CTxOut& prev_txout = txundo->vprevout[i].out;
+            const Coin& prev_coin = txundo->vprevout[i];
+            const CTxOut& prev_txout = prev_coin.out;
+
             amt_total_in += prev_txout.nValue;
+            switch (verbosity) {
+                case TxVerbosity::SHOW_TXID:
+                case TxVerbosity::SHOW_DETAILS:
+                    break;
+
+                case TxVerbosity::SHOW_DETAILS_AND_PREVOUT:
+                    UniValue o_script_pub_key(UniValue::VOBJ);
+                    ScriptPubKeyToUniv(prev_txout.scriptPubKey, o_script_pub_key, /* includeHex */ true);
+
+                    UniValue p(UniValue::VOBJ);
+                    p.pushKV("generated", bool(prev_coin.fCoinBase));
+                    p.pushKV("height", uint64_t(prev_coin.nHeight));
+                    p.pushKV("value", ValueFromAmount(prev_txout.nValue));
+                    p.pushKV("scriptPubKey", o_script_pub_key);
+                    in.pushKV("prevout", p);
+                    break;
+            }
         }
         in.pushKV("sequence", (int64_t)txin.nSequence);
         vin.push_back(in);

src/rest.cpp

@@ -327,7 +327,7 @@ static bool rest_block(const std::any& context,
 
 static bool rest_block_extended(const std::any& context, HTTPRequest* req, const std::string& strURIPart)
 {
-    return rest_block(context, req, strURIPart, TxVerbosity::SHOW_DETAILS);
+    return rest_block(context, req, strURIPart, TxVerbosity::SHOW_DETAILS_AND_PREVOUT);
 }
 
 static bool rest_block_notxdetails(const std::any& context, HTTPRequest* req, const std::string& strURIPart)

src/rpc/blockchain.cpp

@@ -217,15 +217,16 @@ UniValue blockToJSON(const CBlock& block, const CBlockIndex* tip, const CBlockIn
             break;
 
         case TxVerbosity::SHOW_DETAILS:
+        case TxVerbosity::SHOW_DETAILS_AND_PREVOUT:
             CBlockUndo blockUndo;
             const bool have_undo = !IsBlockPruned(blockindex) && UndoReadFromDisk(blockUndo, blockindex);
 
             for (size_t i = 0; i < block.vtx.size(); ++i) {
                 const CTransactionRef& tx = block.vtx.at(i);
                 // coinbase transaction (i.e. i == 0) doesn't have undo data
-                const CTxUndo* txundo = (have_undo && i) ? &blockUndo.vtxundo.at(i - 1) : nullptr;
+                const CTxUndo* txundo = (have_undo && i > 0) ? &blockUndo.vtxundo.at(i - 1) : nullptr;
                 UniValue objTx(UniValue::VOBJ);
-                TxToUniv(*tx, uint256(), objTx, true, RPCSerializationFlags(), txundo);
+                TxToUniv(*tx, uint256(), objTx, true, RPCSerializationFlags(), txundo, verbosity);
                 txs.push_back(objTx);
             }
     }
@@ -937,7 +938,8 @@ static RPCHelpMan getblock()
     return RPCHelpMan{"getblock",
                 "\nIf verbosity is 0, returns a string that is serialized, hex-encoded data for block 'hash'.\n"
                 "If verbosity is 1, returns an Object with information about block <hash>.\n"
-                "If verbosity is 2, returns an Object with information about block <hash> and information about each transaction.\n",
+                "If verbosity is 2, returns an Object with information about block <hash> and information about each transaction.\n"
+                "If verbosity is 3, returns an Object with information about block <hash> and information about each transaction, including prevout information for inputs (only for unpruned blocks in the current best chain).\n",
                 {
                     {"blockhash", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The block hash"},
                     {"verbosity|verbose", RPCArg::Type::NUM, RPCArg::Default{1}, "0 for hex-encoded data, 1 for a json object, and 2 for json object with transaction data"},
@@ -1027,8 +1029,10 @@ static RPCHelpMan getblock()
     TxVerbosity tx_verbosity;
     if (verbosity == 1) {
         tx_verbosity = TxVerbosity::SHOW_TXID;
-    } else {
+    } else if (verbosity == 2) {
         tx_verbosity = TxVerbosity::SHOW_DETAILS;
+    } else {
+        tx_verbosity = TxVerbosity::SHOW_DETAILS_AND_PREVOUT;
     }
 
     return blockToJSON(block, tip, pblockindex, tx_verbosity);

src/rpc/blockchain.h

@@ -6,6 +6,7 @@
 #define BITCOIN_RPC_BLOCKCHAIN_H
 
 #include <consensus/amount.h>
+#include <core_io.h>
 #include <streams.h>
 #include <sync.h>
 
@@ -38,7 +39,7 @@ double GetDifficulty(const CBlockIndex* blockindex);
 void RPCNotifyBlockChange(const CBlockIndex*);
 
 /** Block description to JSON */
-UniValue blockToJSON(const CBlock& block, const CBlockIndex* tip, const CBlockIndex* blockindex, TxVerbosity verbosity = TxVerbosity::SHOW_TXID) LOCKS_EXCLUDED(cs_main);
+UniValue blockToJSON(const CBlock& block, const CBlockIndex* tip, const CBlockIndex* blockindex, TxVerbosity verbosity) LOCKS_EXCLUDED(cs_main);
 
 /** Mempool information to JSON */
 UniValue MempoolInfoToJSON(const CTxMemPool& pool);