interfaces: Stop exposing wallet destdata to gui

Stop giving GUI access to destdata rows in database. Replace with narrow
API just for saving and reading receive request information.

This simplifies code and should prevent the GUI from interfering with
other destdata like address-used status.

Note: No user-visible behavior is changing in this commit. New
CWallet::SetAddressReceiveRequest() implementation avoids a bug in
CWallet::AddDestData() where a modification would leave the previous
value in memory while writing the new value to disk. But it doesn't
matter because the GUI doesn't currently expose the ability to modify
receive requests, only to add and erase them.

4 files changed, 26 insertions, 18 deletions

diff --git a/src/wallet/interfaces.cpp b/src/wallet/interfaces.cpp
index 1fb789b128..9a4b077b5a 100644
--- a/src/wallet/interfaces.cpp
+++ b/src/wallet/interfaces.cpp
@@ -199,22 +199,14 @@ public:
         }
         return result;
     }
-    bool addDestData(const CTxDestination& dest, const std::string& key, const std::string& value) override
-    {
+    std::vector<std::string> getAddressReceiveRequests() override {
         LOCK(m_wallet->cs_wallet);
-        WalletBatch batch{m_wallet->GetDatabase()};
-        return m_wallet->AddDestData(batch, dest, key, value);
+        return m_wallet->GetAddressReceiveRequests();
     }
-    bool eraseDestData(const CTxDestination& dest, const std::string& key) override
-    {
+    bool setAddressReceiveRequest(const CTxDestination& dest, const std::string& id, const std::string& value) override {
         LOCK(m_wallet->cs_wallet);
         WalletBatch batch{m_wallet->GetDatabase()};
-        return m_wallet->EraseDestData(batch, dest, key);
-    }
-    std::vector<std::string> getDestValues(const std::string& prefix) override
-    {
-        LOCK(m_wallet->cs_wallet);
-        return m_wallet->GetDestValues(prefix);
+        return m_wallet->SetAddressReceiveRequest(batch, dest, id, value);
     }
     void lockCoin(const COutPoint& output) override
     {
diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
index 5480f3ab22..932a0c2eca 100644
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -391,10 +391,10 @@ BOOST_AUTO_TEST_CASE(LoadReceiveRequests)
     LOCK(m_wallet.cs_wallet);
     WalletBatch batch{m_wallet.GetDatabase()};
     m_wallet.AddDestData(batch, dest, "misc", "val_misc");
-    m_wallet.AddDestData(batch, dest, "rr0", "val_rr0");
-    m_wallet.AddDestData(batch, dest, "rr1", "val_rr1");
+    m_wallet.SetAddressReceiveRequest(batch, dest, "0", "val_rr0");
+    m_wallet.SetAddressReceiveRequest(batch, dest, "1", "val_rr1");
 
-    auto values = m_wallet.GetDestValues("rr");
+    auto values = m_wallet.GetAddressReceiveRequests();
     BOOST_CHECK_EQUAL(values.size(), 2U);
     BOOST_CHECK_EQUAL(values[0], "val_rr0");
     BOOST_CHECK_EQUAL(values[1], "val_rr1");
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 08e480225d..56c1ea7fa6 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -3798,8 +3798,9 @@ bool CWallet::GetDestData(const CTxDestination &dest, const std::string &key, st
     return false;
 }
 
-std::vector<std::string> CWallet::GetDestValues(const std::string& prefix) const
+std::vector<std::string> CWallet::GetAddressReceiveRequests() const
 {
+    const std::string prefix{"rr"};
     std::vector<std::string> values;
     for (const auto& address : m_address_book) {
         for (const auto& data : address.second.destdata) {
@@ -3811,6 +3812,20 @@ std::vector<std::string> CWallet::GetDestValues(const std::string& prefix) const
     return values;
 }
 
+bool CWallet::SetAddressReceiveRequest(WalletBatch& batch, const CTxDestination& dest, const std::string& id, const std::string& value)
+{
+    const std::string key{"rr" + id}; // "rr" prefix = "receive request" in destdata
+    CAddressBookData& data = m_address_book.at(dest);
+    if (value.empty()) {
+        if (!batch.EraseDestData(EncodeDestination(dest), key)) return false;
+        data.destdata.erase(key);
+    } else {
+        if (!batch.WriteDestData(EncodeDestination(dest), key, value)) return false;
+        data.destdata[key] = value;
+    }
+    return true;
+}
+
 std::unique_ptr<WalletDatabase> MakeWalletDatabase(const std::string& name, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error_string)
 {
     // Do some checking on wallet path. It should be either a:
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index eb797938cd..58538df0af 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -876,8 +876,6 @@ public:
     void LoadDestData(const CTxDestination& dest, const std::string& key, const std::string& value) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
     //! Look up a destination data tuple in the store, return true if found false otherwise
     bool GetDestData(const CTxDestination& dest, const std::string& key, std::string* value) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
-    //! Get all destination values matching a prefix.
-    std::vector<std::string> GetDestValues(const std::string& prefix) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
 
     //! Holds a timestamp at which point the wallet is scheduled (externally) to be relocked. Caller must arrange for actual relocking to occur via Lock().
     int64_t nRelockTime GUARDED_BY(cs_wallet){0};
@@ -1084,6 +1082,9 @@ public:
 
     bool DelAddressBook(const CTxDestination& address);
 
+    std::vector<std::string> GetAddressReceiveRequests() const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
+    bool SetAddressReceiveRequest(WalletBatch& batch, const CTxDestination& dest, const std::string& id, const std::string& value) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
+
     unsigned int GetKeyPoolSize() const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
 
     //! signify that a particular wallet feature is now used.