wallet: Add AddWallet, RemoveWallet, GetWallet and GetWallets

With these new functions all vpwallets usage are removed
and vpwallets is now a static variable (no external linkage).

6 files changed, 67 insertions, 33 deletions

diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
index 860e1cfac3..8b834e4626 100644
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -315,7 +315,7 @@ bool WalletInit::Open() const
         if (!pwallet) {
             return false;
         }
-        vpwallets.push_back(pwallet);
+        AddWallet(pwallet);
     }
 
     return true;
@@ -323,29 +323,29 @@ bool WalletInit::Open() const
 
 void WalletInit::Start(CScheduler& scheduler) const
 {
-    for (CWallet* pwallet : vpwallets) {
+    for (CWallet* pwallet : GetWallets()) {
         pwallet->postInitProcess(scheduler);
     }
 }
 
 void WalletInit::Flush() const
 {
-    for (CWallet* pwallet : vpwallets) {
+    for (CWallet* pwallet : GetWallets()) {
         pwallet->Flush(false);
     }
 }
 
 void WalletInit::Stop() const
 {
-    for (CWallet* pwallet : vpwallets) {
+    for (CWallet* pwallet : GetWallets()) {
         pwallet->Flush(true);
     }
 }
 
 void WalletInit::Close() const
 {
-    for (CWallet* pwallet : vpwallets) {
+    for (CWallet* pwallet : GetWallets()) {
+        RemoveWallet(pwallet);
         delete pwallet;
     }
-    vpwallets.clear();
 }
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 5298283b4b..9875a2697d 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -46,14 +46,13 @@ CWallet *GetWalletForJSONRPCRequest(const JSONRPCRequest& request)
     if (request.URI.substr(0, WALLET_ENDPOINT_BASE.size()) == WALLET_ENDPOINT_BASE) {
         // wallet endpoint was used
         std::string requestedWallet = urlDecode(request.URI.substr(WALLET_ENDPOINT_BASE.size()));
-        for (CWallet* pwallet : ::vpwallets) {
-            if (pwallet->GetName() == requestedWallet) {
-                return pwallet;
-            }
-        }
-        throw JSONRPCError(RPC_WALLET_NOT_FOUND, "Requested wallet does not exist or is not loaded");
+        CWallet* pwallet = GetWallet(requestedWallet);
+        if (!pwallet) throw JSONRPCError(RPC_WALLET_NOT_FOUND, "Requested wallet does not exist or is not loaded");
+        return pwallet;
     }
-    return ::vpwallets.size() == 1 || (request.fHelp && ::vpwallets.size() > 0) ? ::vpwallets[0] : nullptr;
+
+    std::vector<CWallet*> wallets = GetWallets();
+    return wallets.size() == 1 || (request.fHelp && wallets.size() > 0) ? wallets[0] : nullptr;
 }
 
 std::string HelpRequiringPassphrase(CWallet * const pwallet)
@@ -67,7 +66,7 @@ bool EnsureWalletIsAvailable(CWallet * const pwallet, bool avoidException)
 {
     if (pwallet) return true;
     if (avoidException) return false;
-    if (::vpwallets.empty()) {
+    if (GetWallets().empty()) {
         // Note: It isn't currently possible to trigger this error because
         // wallet RPC methods aren't registered unless a wallet is loaded. But
         // this error is being kept as a precaution, because it's possible in
@@ -2862,8 +2861,7 @@ UniValue listwallets(const JSONRPCRequest& request)
 
     UniValue obj(UniValue::VARR);
 
-    for (CWallet* pwallet : vpwallets) {
-
+    for (CWallet* pwallet : GetWallets()) {
         if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
             return NullUniValue;
         }
diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
index 57705926a3..99c963a348 100644
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -74,7 +74,7 @@ BOOST_FIXTURE_TEST_CASE(rescan, TestChain100Setup)
     // after.
     {
         CWallet wallet("dummy", WalletDatabase::CreateDummy());
-        vpwallets.insert(vpwallets.begin(), &wallet);
+        AddWallet(&wallet);
         UniValue keys;
         keys.setArray();
         UniValue key;
@@ -105,7 +105,7 @@ BOOST_FIXTURE_TEST_CASE(rescan, TestChain100Setup)
                       "downloading and rescanning the relevant blocks (see -reindex and -rescan "
                       "options).\"}},{\"success\":true}]",
                               0, oldTip->GetBlockTimeMax(), TIMESTAMP_WINDOW));
-        vpwallets.erase(vpwallets.begin());
+        RemoveWallet(&wallet);
     }
 }
 
@@ -140,9 +140,9 @@ BOOST_FIXTURE_TEST_CASE(importwallet_rescan, TestChain100Setup)
         JSONRPCRequest request;
         request.params.setArray();
         request.params.push_back((pathTemp / "wallet.backup").string());
-        vpwallets.insert(vpwallets.begin(), &wallet);
+        AddWallet(&wallet);
         ::dumpwallet(request);
-        vpwallets.erase(vpwallets.begin());
+        RemoveWallet(&wallet);
     }
 
     // Call importwallet RPC and verify all blocks with timestamps >= BLOCK_TIME
@@ -153,9 +153,9 @@ BOOST_FIXTURE_TEST_CASE(importwallet_rescan, TestChain100Setup)
         JSONRPCRequest request;
         request.params.setArray();
         request.params.push_back((pathTemp / "wallet.backup").string());
-        vpwallets.insert(vpwallets.begin(), &wallet);
+        AddWallet(&wallet);
         ::importwallet(request);
-        vpwallets.erase(vpwallets.begin());
+        RemoveWallet(&wallet);
 
         LOCK(wallet.cs_wallet);
         BOOST_CHECK_EQUAL(wallet.mapWallet.size(), 3U);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index dcf566c1e2..fcc4cfb1fa 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -28,12 +28,45 @@
 #include <utilmoneystr.h>
 #include <wallet/fees.h>
 
+#include <algorithm>
 #include <assert.h>
 #include <future>
 
 #include <boost/algorithm/string/replace.hpp>
 
-std::vector<CWallet*> vpwallets;
+static std::vector<CWallet*> vpwallets;
+
+bool AddWallet(CWallet* wallet)
+{
+    assert(wallet);
+    std::vector<CWallet*>::const_iterator i = std::find(vpwallets.begin(), vpwallets.end(), wallet);
+    if (i != vpwallets.end()) return false;
+    vpwallets.push_back(wallet);
+    return true;
+}
+
+bool RemoveWallet(CWallet* wallet)
+{
+    assert(wallet);
+    std::vector<CWallet*>::iterator i = std::find(vpwallets.begin(), vpwallets.end(), wallet);
+    if (i == vpwallets.end()) return false;
+    vpwallets.erase(i);
+    return true;
+}
+
+std::vector<CWallet*> GetWallets()
+{
+    return vpwallets;
+}
+
+CWallet* GetWallet(const std::string& name)
+{
+    for (CWallet* wallet : vpwallets) {
+        if (wallet->GetName() == name) return wallet;
+    }
+    return nullptr;
+}
+
 /** Transaction fee set by the user */
 CFeeRate payTxFee(DEFAULT_TRANSACTION_FEE);
 unsigned int nTxConfirmTarget = DEFAULT_TX_CONFIRM_TARGET;
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index ceac4ac58c..67f0b3adb7 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -32,7 +32,10 @@
 #include <utility>
 #include <vector>
 
-extern std::vector<CWallet*> vpwallets;
+bool AddWallet(CWallet* wallet);
+bool RemoveWallet(CWallet* wallet);
+std::vector<CWallet*> GetWallets();
+CWallet* GetWallet(const std::string& name);
 
 /**
  * Settings
@@ -267,7 +270,7 @@ public:
 //Get the marginal bytes of spending the specified output
 int CalculateMaximumSignedInputSize(const CTxOut& txout, const CWallet* pwallet);
 
-/** 
+/**
  * A transaction with a bunch of additional info that only the owner cares about.
  * It includes any unrecorded transactions needed to link it back to the block chain.
  */
@@ -652,7 +655,7 @@ struct CoinEligibilityFilter
 };
 
 class WalletRescanReserver; //forward declarations for ScanForWalletTransactions/RescanFromTime
-/** 
+/**
  * A CWallet is an extension of a keystore, which also maintains a set of transactions and balances,
  * and provides the ability to create new transactions.
  */
@@ -902,7 +905,7 @@ public:
     void GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) const;
     unsigned int ComputeTimeSmart(const CWalletTx& wtx) const;
 
-    /** 
+    /**
      * Increment the next transaction order id
      * @return next transaction order id
      */
@@ -1031,7 +1034,7 @@ public:
     }
 
     void GetScriptForMining(std::shared_ptr<CReserveScript> &script);
-    
+
     unsigned int GetKeyPoolSize()
     {
         AssertLockHeld(cs_wallet); // set{Ex,In}ternalKeyPool
@@ -1056,7 +1059,7 @@ public:
     //! Flush wallet (bitdb flush)
     void Flush(bool shutdown=false);
 
-    /** 
+    /**
      * Address book entry changed.
      * @note called with lock cs_wallet held.
      */
@@ -1065,7 +1068,7 @@ public:
             const std::string &purpose,
             ChangeType status)> NotifyAddressBookChanged;
 
-    /** 
+    /**
      * Wallet transaction added, removed or updated.
      * @note called with lock cs_wallet held.
      */
@@ -1112,7 +1115,7 @@ public:
 
     /* Generates a new HD master key (will not be activated) */
     CPubKey GenerateNewHDMasterKey();
-    
+
     /* Set the current HD master key (will reset the chain child index counters)
        Sets the master key's version based on the current wallet version (so the
        caller must ensure the current wallet version is correct before calling
@@ -1183,7 +1186,7 @@ public:
 };
 
 
-/** 
+/**
  * DEPRECATED Account information.
  * Stored in wallet with key "acc"+string account name.
  */
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 0e8a12ee97..5b275131af 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -756,7 +756,7 @@ void MaybeCompactWalletDB()
         return;
     }
 
-    for (CWallet* pwallet : vpwallets) {
+    for (CWallet* pwallet : GetWallets()) {
         WalletDatabase& dbh = pwallet->GetDBHandle();
 
         unsigned int nUpdateCounter = dbh.nUpdateCounter;