Rename account to label where appropriate

This change only updates strings and adds RPC aliases, but should simplify the
implementation of address labels in
bitcoin#7729, by getting renaming out of the
way and letting it focus on semantics.

The difference between accounts and labels is that labels apply only to
addresses, while accounts apply to both addresses and transactions
(transactions have "from" and "to" accounts). The code associating accounts
with transactions is clumsy and unreliable so we would like get rid of it.

doc/release-notes.md

@@ -63,6 +63,16 @@ RPC changes
 
 - The `createrawtransaction` RPC will now accept an array or dictionary (kept for compatibility) for the `outputs` parameter. This means the order of transaction outputs can be specified by the client.
 - The `fundrawtransaction` RPC will reject the previously deprecated `reserveChangeKey` option.
+- Wallet `getnewaddress` and `addmultisigaddress` RPC `account` named
+  parameters have been renamed to `label` with no change in behavior.
+- Wallet `getlabeladdress`, `getreceivedbylabel`, `listreceivedbylabel`, and
+  `setlabel` RPCs have been added to replace `getaccountaddress`,
+  `getreceivedbyaccount`, `listreceivedbyaccount`, and `setaccount` RPCs,
+  which are now deprecated. There is no change in behavior between the
+  new RPCs and deprecated RPCs.
+- Wallet `listreceivedbylabel`, `listreceivedbyaccount` and `listunspent` RPCs
+  add `label` fields to returned JSON objects that previously only had
+  `account` fields.
 
 External wallet files
 ---------------------

src/qt/paymentserver.cpp

@@ -634,8 +634,6 @@ void PaymentServer::fetchPaymentACK(CWallet* wallet, const SendCoinsRecipient& r
     payment.add_transactions(transaction.data(), transaction.size());
 
     // Create a new refund address, or re-use:
-    QString account = tr("Refund from %1").arg(recipient.authenticatedMerchant);
-    std::string strAccount = account.toStdString();
     CPubKey newKey;
     if (wallet->GetKeyFromPool(newKey)) {
         // BIP70 requests encode the scriptPubKey directly, so we are not restricted to address
@@ -646,7 +644,8 @@ void PaymentServer::fetchPaymentACK(CWallet* wallet, const SendCoinsRecipient& r
         const OutputType change_type = wallet->m_default_change_type != OutputType::NONE ? wallet->m_default_change_type : wallet->m_default_address_type;
         wallet->LearnRelatedScripts(newKey, change_type);
         CTxDestination dest = GetDestinationForKey(newKey, change_type);
-        wallet->SetAddressBook(dest, strAccount, "refund");
+        std::string label = tr("Refund from %1").arg(recipient.authenticatedMerchant).toStdString();
+        wallet->SetAddressBook(dest, label, "refund");
 
         CScript s = GetScriptForDestination(dest);
         payments::Output* refund_to = payment.add_refund_to();

src/rpc/client.cpp

@@ -40,13 +40,17 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "settxfee", 0, "amount" },
     { "getreceivedbyaddress", 1, "minconf" },
     { "getreceivedbyaccount", 1, "minconf" },
+    { "getreceivedbylabel", 1, "minconf" },
     { "listreceivedbyaddress", 0, "minconf" },
     { "listreceivedbyaddress", 1, "include_empty" },
     { "listreceivedbyaddress", 2, "include_watchonly" },
     { "listreceivedbyaddress", 3, "address_filter" },
     { "listreceivedbyaccount", 0, "minconf" },
     { "listreceivedbyaccount", 1, "include_empty" },
     { "listreceivedbyaccount", 2, "include_watchonly" },
+    { "listreceivedbylabel", 0, "minconf" },
+    { "listreceivedbylabel", 1, "include_empty" },
+    { "listreceivedbylabel", 2, "include_watchonly" },
     { "getbalance", 1, "minconf" },
     { "getbalance", 2, "include_watchonly" },
     { "getblockhash", 0, "height" },

src/rpc/protocol.h

@@ -76,7 +76,7 @@ enum RPCErrorCode
     //! Wallet errors
     RPC_WALLET_ERROR                = -4,  //!< Unspecified problem with wallet (key not found etc.)
     RPC_WALLET_INSUFFICIENT_FUNDS   = -6,  //!< Not enough funds in wallet or account
-    RPC_WALLET_INVALID_ACCOUNT_NAME = -11, //!< Invalid account name
+    RPC_WALLET_INVALID_LABEL_NAME   = -11, //!< Invalid label name
     RPC_WALLET_KEYPOOL_RAN_OUT      = -12, //!< Keypool ran out, call keypoolrefill first
     RPC_WALLET_UNLOCK_NEEDED        = -13, //!< Enter the wallet passphrase with walletpassphrase first
     RPC_WALLET_PASSPHRASE_INCORRECT = -14, //!< The wallet passphrase entered was incorrect
@@ -85,6 +85,9 @@ enum RPCErrorCode
     RPC_WALLET_ALREADY_UNLOCKED     = -17, //!< Wallet is already unlocked
     RPC_WALLET_NOT_FOUND            = -18, //!< Invalid wallet specified
     RPC_WALLET_NOT_SPECIFIED        = -19, //!< No wallet specified (error when there are multiple wallets loaded)
+
+    //! Backwards compatible aliases
+    RPC_WALLET_INVALID_ACCOUNT_NAME = RPC_WALLET_INVALID_LABEL_NAME,
 };
 
 UniValue JSONRPCRequestObj(const std::string& strMethod, const UniValue& params, const UniValue& id);

src/wallet/wallet.cpp

@@ -809,12 +809,12 @@ bool CWallet::AccountMove(std::string strFrom, std::string strTo, CAmount nAmoun
     return true;
 }
 
-bool CWallet::GetAccountDestination(CTxDestination &dest, std::string strAccount, bool bForceNew)
+bool CWallet::GetLabelDestination(CTxDestination &dest, const std::string& label, bool bForceNew)
 {
     CWalletDB walletdb(*dbw);
 
     CAccount account;
-    walletdb.ReadAccount(strAccount, account);
+    walletdb.ReadAccount(label, account);
 
     if (!bForceNew) {
         if (!account.vchPubKey.IsValid())
@@ -840,8 +840,8 @@ bool CWallet::GetAccountDestination(CTxDestination &dest, std::string strAccount
 
         LearnRelatedScripts(account.vchPubKey, m_default_address_type);
         dest = GetDestinationForKey(account.vchPubKey, m_default_address_type);
-        SetAddressBook(dest, strAccount, "receive");
-        walletdb.WriteAccount(strAccount, account);
+        SetAddressBook(dest, label, "receive");
+        walletdb.WriteAccount(label, account);
     } else {
         dest = GetDestinationForKey(account.vchPubKey, m_default_address_type);
     }
@@ -2220,7 +2220,7 @@ CAmount CWallet::GetLegacyBalance(const isminefilter& filter, int minDepth, cons
         for (const CTxOut& out : wtx.tx->vout) {
             if (outgoing && IsChange(out)) {
                 debit -= out.nValue;
-            } else if (IsMine(out) & filter && depth >= minDepth && (!account || *account == GetAccountName(out.scriptPubKey))) {
+            } else if (IsMine(out) & filter && depth >= minDepth && (!account || *account == GetLabelName(out.scriptPubKey))) {
                 balance += out.nValue;
             }
         }
@@ -3251,7 +3251,7 @@ bool CWallet::DelAddressBook(const CTxDestination& address)
     return CWalletDB(*dbw).EraseName(EncodeDestination(address));
 }
 
-const std::string& CWallet::GetAccountName(const CScript& scriptPubKey) const
+const std::string& CWallet::GetLabelName(const CScript& scriptPubKey) const
 {
     CTxDestination address;
     if (ExtractDestination(scriptPubKey, address) && !scriptPubKey.IsUnspendable()) {
@@ -3261,9 +3261,9 @@ const std::string& CWallet::GetAccountName(const CScript& scriptPubKey) const
         }
     }
     // A scriptPubKey that doesn't have an entry in the address book is
-    // associated with the default account ("").
-    const static std::string DEFAULT_ACCOUNT_NAME;
-    return DEFAULT_ACCOUNT_NAME;
+    // associated with the default label ("").
+    const static std::string DEFAULT_LABEL_NAME;
+    return DEFAULT_LABEL_NAME;
 }
 
 /**
@@ -3619,15 +3619,15 @@ std::set< std::set<CTxDestination> > CWallet::GetAddressGroupings()
     return ret;
 }
 
-std::set<CTxDestination> CWallet::GetAccountAddresses(const std::string& strAccount) const
+std::set<CTxDestination> CWallet::GetLabelAddresses(const std::string& label) const
 {
     LOCK(cs_wallet);
     std::set<CTxDestination> result;
     for (const std::pair<CTxDestination, CAddressBookData>& item : mapAddressBook)
     {
         const CTxDestination& address = item.first;
         const std::string& strName = item.second.name;
-        if (strName == strAccount)
+        if (strName == label)
             result.insert(address);
     }
     return result;

src/wallet/wallet.h

@@ -929,7 +929,7 @@ class CWallet final : public CCryptoKeyStore, public CValidationInterface
     int64_t IncOrderPosNext(CWalletDB *pwalletdb = nullptr);
     DBErrors ReorderTransactions();
     bool AccountMove(std::string strFrom, std::string strTo, CAmount nAmount, std::string strComment = "");
-    bool GetAccountDestination(CTxDestination &dest, std::string strAccount, bool bForceNew = false);
+    bool GetLabelDestination(CTxDestination &dest, const std::string& label, bool bForceNew = false);
 
     void MarkDirty();
     bool AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose=true);
@@ -1007,7 +1007,7 @@ class CWallet final : public CCryptoKeyStore, public CValidationInterface
     std::set< std::set<CTxDestination> > GetAddressGroupings();
     std::map<CTxDestination, CAmount> GetAddressBalances();
 
-    std::set<CTxDestination> GetAccountAddresses(const std::string& strAccount) const;
+    std::set<CTxDestination> GetLabelAddresses(const std::string& label) const;
 
     isminetype IsMine(const CTxIn& txin) const;
     /**
@@ -1037,7 +1037,7 @@ class CWallet final : public CCryptoKeyStore, public CValidationInterface
 
     bool DelAddressBook(const CTxDestination& address);
 
-    const std::string& GetAccountName(const CScript& scriptPubKey) const;
+    const std::string& GetLabelName(const CScript& scriptPubKey) const;
 
     void Inventory(const uint256 &hash) override
     {