Merge #15638: Move-only: Pull wallet code out of libbitcoin_server

4d074e84a2 [build] Move AnalyzePSBT from psbt.cpp to node/psbt.cpp (Russell Yanofsky)
fd509bd1f7 [docs] Document src subdirectories and different libraries (John Newbery)
9eaeb7fb8d [build] Move wallet load functions to wallet/load unit (John Newbery)
91a25d1e71 [build] Add several util units (John Newbery)
99517866b6 [build] Move several units into common libraries (John Newbery)
0509465542 [build] Move rpc rawtransaction util functions to rpc/rawtransaction_util.cpp (John Newbery)
1acc61f874 [build] Move rpc utility methods to rpc/util (John Newbery)
4a75c9d651 [build] Move policy settings to new src/policy/settings unit (John Newbery)
fdf8888b6f [build] Move CheckTransaction from lib_server to lib_consensus (John Newbery)

Pull request description:

  This is a move-only commit. No code is changing and the moves can be easily verified with:

  ```sh
  git log -p -n1 --color-moved=dimmed_zebra
  ```

  This commit moves functions and variables that wallet code depends on out of libbitcoin_server.a, so the bitcoin-wallet tool can be built without libbitcoin_server.a in #15639, and attempting to access server state from wallet code will result in link errors instead of silently broken code.

  List of moves:

  - `CheckTransaction` moves from `consensus/tx_verify.cpp` to `consensus/tx_check.cpp`
  - `urlDecode` moves from `httpserver.cpp` to `util/url.cpp`
  - `TransactionErrorString` moves from `node/transaction.cpp` to `util/error.cpp`
  - `StringForFeeReason` and `FeeModeFromString` move from `policy/fees.cpp` to `util/fees.cpp`
  - `incrementalRelayFee` `dustRelayFee` and `nBytesPerSigOp` move from `policy/policy.cpp` to `policy/settings.cpp`
  - `SignalsOptInRBF` moves from `policy/rbf.cpp` to `util/rbf.cpp`
  - `fIsBareMultisigStd` moves from `validation.cpp` to `policy/settings.cpp`
  - `ConstructTransaction` `TxInErrorToJSON` and `SignTransaction` move from `rpc/rawtransaction.cpp` to `rpc/rawtransaction_util.cpp`
  - `RPCTypeCheck` `RPCTypeCheckArgument` `RPCTypeCheckObj` `AmountFromValue` `ParseHashV``ParseHashO` `ParseHexV` `ParseHexO` `HelpExampleCli` and `HelpExampleRpc` move from `rpc/server.cpp` to `rpc/util.cpp`
  - `AmountHighWarn` and `AmountErrMsg` move from `ui_interface.cpp` to `util/error.cpp`
  - `FormatStateMessage` and `strMessageMagic` move from `validation.cpp` to `util/validation.cpp`
  - `VerifyWallets` `LoadWallets` `StartWallets` `FlushWallets` `StopWallets` and `UnloadWallets` move from `wallet/init.cpp` to `wallet/node.cpp`

ACKs for commit 4d074e:
  jnewbery:
    utACK 4d074e84a2 (checked by doing the rebase myself and verifying no difference between my branch and 4d074e84a2)

Tree-SHA512: 5e1604a9fb06475f2b96da0de0baa8330f4dda834dc20a0183ef11e1e4c27631d1d1bbb9abf0054efc03d56945fdf9920f63366b6a4f200f665b742a479ff75c

src/rpc/util.cpp

@@ -10,6 +10,110 @@
 
 InitInterfaces* g_rpc_interfaces = nullptr;
 
+void RPCTypeCheck(const UniValue& params,
+                  const std::list<UniValueType>& typesExpected,
+                  bool fAllowNull)
+{
+    unsigned int i = 0;
+    for (const UniValueType& t : typesExpected) {
+        if (params.size() <= i)
+            break;
+
+        const UniValue& v = params[i];
+        if (!(fAllowNull && v.isNull())) {
+            RPCTypeCheckArgument(v, t);
+        }
+        i++;
+    }
+}
+
+void RPCTypeCheckArgument(const UniValue& value, const UniValueType& typeExpected)
+{
+    if (!typeExpected.typeAny && value.type() != typeExpected.type) {
+        throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Expected type %s, got %s", uvTypeName(typeExpected.type), uvTypeName(value.type())));
+    }
+}
+
+void RPCTypeCheckObj(const UniValue& o,
+    const std::map<std::string, UniValueType>& typesExpected,
+    bool fAllowNull,
+    bool fStrict)
+{
+    for (const auto& t : typesExpected) {
+        const UniValue& v = find_value(o, t.first);
+        if (!fAllowNull && v.isNull())
+            throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing %s", t.first));
+
+        if (!(t.second.typeAny || v.type() == t.second.type || (fAllowNull && v.isNull()))) {
+            std::string err = strprintf("Expected type %s for %s, got %s",
+                uvTypeName(t.second.type), t.first, uvTypeName(v.type()));
+            throw JSONRPCError(RPC_TYPE_ERROR, err);
+        }
+    }
+
+    if (fStrict)
+    {
+        for (const std::string& k : o.getKeys())
+        {
+            if (typesExpected.count(k) == 0)
+            {
+                std::string err = strprintf("Unexpected key %s", k);
+                throw JSONRPCError(RPC_TYPE_ERROR, err);
+            }
+        }
+    }
+}
+
+CAmount AmountFromValue(const UniValue& value)
+{
+    if (!value.isNum() && !value.isStr())
+        throw JSONRPCError(RPC_TYPE_ERROR, "Amount is not a number or string");
+    CAmount amount;
+    if (!ParseFixedPoint(value.getValStr(), 8, &amount))
+        throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");
+    if (!MoneyRange(amount))
+        throw JSONRPCError(RPC_TYPE_ERROR, "Amount out of range");
+    return amount;
+}
+
+uint256 ParseHashV(const UniValue& v, std::string strName)
+{
+    std::string strHex(v.get_str());
+    if (64 != strHex.length())
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("%s must be of length %d (not %d, for '%s')", strName, 64, strHex.length(), strHex));
+    if (!IsHex(strHex)) // Note: IsHex("") is false
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be hexadecimal string (not '"+strHex+"')");
+    return uint256S(strHex);
+}
+uint256 ParseHashO(const UniValue& o, std::string strKey)
+{
+    return ParseHashV(find_value(o, strKey), strKey);
+}
+std::vector<unsigned char> ParseHexV(const UniValue& v, std::string strName)
+{
+    std::string strHex;
+    if (v.isStr())
+        strHex = v.get_str();
+    if (!IsHex(strHex))
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strName+" must be hexadecimal string (not '"+strHex+"')");
+    return ParseHex(strHex);
+}
+std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey)
+{
+    return ParseHexV(find_value(o, strKey), strKey);
+}
+
+std::string HelpExampleCli(const std::string& methodname, const std::string& args)
+{
+    return "> bitcoin-cli " + methodname + " " + args + "\n";
+}
+
+std::string HelpExampleRpc(const std::string& methodname, const std::string& args)
+{
+    return "> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", \"id\":\"curltest\", "
+        "\"method\": \"" + methodname + "\", \"params\": [" + args + "] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
+}
+
 // Converts a hex string to a public key if possible
 CPubKey HexToPubKey(const std::string& hex_in)
 {