parse transaction data using nlohmann-json library

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "iostream": "cpp"
+    }
+}

.vscode/tasks.json

@@ -0,0 +1,28 @@
+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: g++ build active file",
+            "command": "/usr/bin/g++",
+            "args": [
+                "-fdiagnostics-color=always",
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}/${fileBasenameNoExtension}"
+            ],
+            "options": {
+                "cwd": "${fileDirname}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "Task generated by Debugger."
+        }
+    ],
+    "version": "2.0.0"
+}

mine.cpp

@@ -2,66 +2,93 @@
 #include <fstream>
 #include <string>
 #include <vector>
-using namespace std;
+#include <json.hpp>
 
+using json = nlohmann::json;
 
 struct Output {
-  int Amount;
-  string ScriptPubKey;
-}
+  int amount;
+  std::string scriptPubKey;
+  std::string scriptPubKeyAsm;
+  std::string scriptPubKeyType;
+  std::string scriptPubKeyAddress;
+};
 
 struct Input {
-  string txId;
+  std::string txId;
   int vOut;
-  string scriptSig;
-  string sequence;
-  vector<string> witness;
-  vector<Output> prevout;
-  string scriptSigAsm;
+  std::string scriptSig;
+  int sequence;
+  std::vector<std::string> witness;
+  Output prevout;
+  std::string scriptSigAsm;
   bool isCoinbase;
-}
+};
 
 struct Txn {
   int version;
   int locktime;
-  vector<Input> vin;
-  vector<Output> vout;
+  std::vector<Input> vin;
+  std::vector<Output> vout;
+
+};
+
+void from_json(const json& j, Output& p) {
+  j.at("scriptpubkey").get_to(p.scriptPubKey);
+  j.at("scriptpubkey_asm").get_to(p.scriptPubKeyAsm);
+  j.at("scriptpubkey_type").get_to(p.scriptPubKeyType);
+  j.at("scriptpubkey_address").get_to(p.scriptPubKeyAddress);
+  j.at("value").get_to(p.amount);
+}
 
+void from_json(const json& j, Input& p) {
+  j.at("txid").get_to(p.txId);
+  j.at("vout").get_to(p.vOut);
+  j.at("prevout").get_to(p.prevout);
+  j.at("scriptsig").get_to(p.scriptSig);
+  j.at("scriptsig_asm").get_to(p.scriptSigAsm);
+  j.at("witness").get_to(p.witness);
+  j.at("is_coinbase").get_to(p.isCoinbase);
+  j.at("sequence").get_to(p.sequence);
 }
 
-string serialise(string content) {
-    string serialised;
-    int sz = content.size();
-    return serialised;
+void from_json(const json& j, Txn& p) {
+  j.at("version").get_to(p.version);
+  j.at("locktime").get_to(p.locktime);
+  j.at("vin").get_to(p.vin);
+  j.at("vout").get_to(p.vout);
+}
+
+std::string serialise(Txn t) {
+    std::string serialised;
+    return t.vin[0].scriptSig;
 }
 
 int main() {
 
-    freopen("output.txt","w",stdout);
+  freopen("output.txt","w",stdout);
+  std::ifstream myfile("txns.txt");
+  std::string filename;
+  std::vector<std::string> txns;
 
-    ifstream myfile;
-    myfile.open("txns.txt");
-    string filename;
-    vector<string> txns;
+  while (myfile.good()) {
+      getline(myfile,filename);
+      txns.push_back(filename);
+  }
 
-    while (myfile.good()) {
-        getline(myfile,filename);
-        txns.push_back(filename);
-    }
+  myfile.close();
+
+  for (std::string txn: txns) {//man this outer loop is running approx 8000 times!
+    std::string path = "mempool/" + txn;
+    myfile.open(path);
+    json data = json::parse(myfile);
+    Txn t;
+    from_json(data , t);
+    std::cout<<serialise(t)<<std::endl;
+
     myfile.close();
+  }
+
 
-    for (string txn: txns) {//man this outer loop is running approx 8000 times!
-      string path = "mempool/" + txn;
-      myfile.open(path);
-      string content;
-      while (myfile.good()) {
-        string line;
-        getline(myfile,line);
-        content+=line;
-      }
-      serialise(content);
-
-      myfile.close();
-    }
-    return 0;
+  return 0;
 }

output.txt

@@ -1 +1,28 @@
-{  "version": 2,  "locktime": 0,  "vin": [    {      "txid": "79593e210f4e7c61be57dfb6c33541ab39513a3bb964737c8e8c988bd395986e",      "vout": 1,      "prevout": {        "scriptpubkey": "5120f6dcb2b44ee298462ffc8dd9d7b969d660ddedd98ff31dd3be803b699aea9416",        "scriptpubkey_asm": "OP_PUSHNUM_1 OP_PUSHBYTES_32 f6dcb2b44ee298462ffc8dd9d7b969d660ddedd98ff31dd3be803b699aea9416",        "scriptpubkey_type": "v1_p2tr",        "scriptpubkey_address": "bc1p7mwt9dzwu2vyvtlu3hva0wtf6esdmmwe3le3m5a7sqaknxh2jstq3vztqn",        "value": 593313      },      "scriptsig": "",      "scriptsig_asm": "",      "witness": [        "7c6982626a43525e568d328824702b3743b112e40e75293b3162b182c41e7754d481e911839b211cb7547f266814afa911eea85676f69722c1f268410a75f864"      ],      "is_coinbase": false,      "sequence": 4294967295    },    {      "txid": "dd006a4a306b45dab04fb249be9449caae04df24269b60afd443238729260d56",      "vout": 1,      "prevout": {        "scriptpubkey": "5120f6dcb2b44ee298462ffc8dd9d7b969d660ddedd98ff31dd3be803b699aea9416",        "scriptpubkey_asm": "OP_PUSHNUM_1 OP_PUSHBYTES_32 f6dcb2b44ee298462ffc8dd9d7b969d660ddedd98ff31dd3be803b699aea9416",        "scriptpubkey_type": "v1_p2tr",        "scriptpubkey_address": "bc1p7mwt9dzwu2vyvtlu3hva0wtf6esdmmwe3le3m5a7sqaknxh2jstq3vztqn",        "value": 10704      },      "scriptsig": "",      "scriptsig_asm": "",      "witness": [        "c2ed1bd63aa5e6e7d094210615d01cfcd74d87ffeb2232fb909f34dc661300e1ada70e6deda0cf3a05d390820a89b247d2115a59502eb82f1ed619ec929a2acd"      ],      "is_coinbase": false,      "sequence": 4294967295    }  ],  "vout": [    {      "scriptpubkey": "a914bf98ba19c45f75bb76b50afce91fb5bb7276bd7787",      "scriptpubkey_asm": "OP_HASH160 OP_PUSHBYTES_20 bf98ba19c45f75bb76b50afce91fb5bb7276bd77 OP_EQUAL",      "scriptpubkey_type": "p2sh",      "scriptpubkey_address": "3KA5wqaDxNSkEWKdmsnx6jxJBKtQXuhM7u",      "value": 600107    }  ]}
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test.json

@@ -1,10 +1,41 @@
-[
+{
+  "version": 1,
+  "locktime": 0,
+  "vin": [
     {
-      "Name": "Test",
-      "Val": "TestVal"
+      "txid": "3b7dc918e5671037effad7848727da3d3bf302b05f5ded9bec89449460473bbb",
+      "vout": 16,
+      "prevout": {
+        "scriptpubkey": "0014f8d9f2203c6f0773983392a487d45c0c818f9573",
+        "scriptpubkey_asm": "OP_0 OP_PUSHBYTES_20 f8d9f2203c6f0773983392a487d45c0c818f9573",
+        "scriptpubkey_type": "v0_p2wpkh",
+        "scriptpubkey_address": "bc1qlrvlygpudurh8xpnj2jg04zupjqcl9tnk5np40",
+        "value": 37079526
+      },
+      "scriptsig": "",
+      "scriptsig_asm": "",
+      "witness": [
+        "30440220780ad409b4d13eb1882aaf2e7a53a206734aa302279d6859e254a7f0a7633556022011fd0cbdf5d4374513ef60f850b7059c6a093ab9e46beb002505b7cba0623cf301",
+        "022bf8c45da789f695d59f93983c813ec205203056e19ec5d3fbefa809af67e2ec"
+      ],
+      "is_coinbase": false,
+      "sequence": 4294967295
+    }
+  ],
+  "vout": [
+    {
+      "scriptpubkey": "76a9146085312a9c500ff9cc35b571b0a1e5efb7fb9f1688ac",
+      "scriptpubkey_asm": "OP_DUP OP_HASH160 OP_PUSHBYTES_20 6085312a9c500ff9cc35b571b0a1e5efb7fb9f16 OP_EQUALVERIFY OP_CHECKSIG",
+      "scriptpubkey_type": "p2pkh",
+      "scriptpubkey_address": "19oMRmCWMYuhnP5W61ABrjjxHc6RphZh11",
+      "value": 100000
     },
     {
-      "Name": "Test2",
-      "Val": "TestVal2"
+      "scriptpubkey": "0014ad4cc1cc859c57477bf90d0f944360d90a3998bf",
+      "scriptpubkey_asm": "OP_0 OP_PUSHBYTES_20 ad4cc1cc859c57477bf90d0f944360d90a3998bf",
+      "scriptpubkey_type": "v0_p2wpkh",
+      "scriptpubkey_address": "bc1q44xvrny9n3t5w7lep58egsmqmy9rnx9lt6u0tc",
+      "value": 36977942
     }
-]
+  ]
+}

trying_nlohman_json.cpp

@@ -16,21 +16,32 @@ struct Test {
     j.at("Val").get_to(p.Val);
 }
 
-template <typename T, size_t N>
-void from_json(const json& j, T  (&t)[N]) {
-    if (j.size()!=N) {
-        throw std::runtime_error("size!");
-    }
-    size_t index=0;
-    for (auto& item : j) {
-        from_json(item, t[index++]);
-    }
-}
+// template <typename T, size_t N>
+// void from_json(const json& j, T  (&t)[N]) {
+//     if (j.size()!=N) {
+//         throw std::runtime_error("size!");
+//     }
+//     size_t index=0;
+//     for (auto& item : j) {
+//         from_json(item, t[index++]);
+//     }
+// }
 int main() {
     std::ifstream f("test.json");
     json data = json::parse(f);
     Test my_array[2];
     from_json(data, my_array);
     std::cout<<my_array[0].Name<<std::endl;
     return 0;
-}
+}
+
+// [
+//     {
+//       "Name": "Test",
+//       "Val": "TestVal"
+//     },
+//     {
+//       "Name": "Test2",
+//       "Val": "TestVal2"
+//     }
+// ]