Merge #10604: [wallet] [tests] Add listwallets RPC, include wallet name in `getwalletinfo` and add multiwallet test

3707fcd [wallet] [tests] Add listwallets to multiwallet test (John Newbery)
9508761 [wallet] [rpc] Add listwallets RPC (John Newbery)
4a05715 [wallet] [rpc] print wallet name in getwalletinfo (John Newbery)
09eacee [wallet] fix comment for CWallet::Verify() (John Newbery)

Pull request description:

  - fix comment for CWallet::Verify (cleanup after #8694)
  - expose the wallet name in `getwalletinfo` rpc
  - add `listwallets` rpc - returns array of wallet names
  - add functional test for multiwallet using new rpc functionality

Tree-SHA512: 52f864726bf8a28421d4f3604a6cb95fffb3f4e19edbce18efaef06142c48dd4adb9e7a65a10de2955c80f13c00803ce27c78ccbc8434d92ef12cd36c4ccb4aa

src/wallet/rpcwallet.cpp

@@ -2447,6 +2447,7 @@ UniValue getwalletinfo(const JSONRPCRequest& request)
             "Returns an object containing various wallet state info.\n"
             "\nResult:\n"
             "{\n"
+            "  \"walletname\": xxxxx,             (string) the wallet name\n"
             "  \"walletversion\": xxxxx,          (numeric) the wallet version\n"
             "  \"balance\": xxxxxxx,              (numeric) the total confirmed balance of the wallet in " + CURRENCY_UNIT + "\n"
             "  \"unconfirmed_balance\": xxx,      (numeric) the total unconfirmed balance of the wallet in " + CURRENCY_UNIT + "\n"
@@ -2469,6 +2470,7 @@ UniValue getwalletinfo(const JSONRPCRequest& request)
     UniValue obj(UniValue::VOBJ);
 
     size_t kpExternalSize = pwallet->KeypoolCountExternalKeys();
+    obj.push_back(Pair("walletname", pwallet->GetName()));
     obj.push_back(Pair("walletversion", pwallet->GetVersion()));
     obj.push_back(Pair("balance",       ValueFromAmount(pwallet->GetBalance())));
     obj.push_back(Pair("unconfirmed_balance", ValueFromAmount(pwallet->GetUnconfirmedBalance())));
@@ -2489,6 +2491,39 @@ UniValue getwalletinfo(const JSONRPCRequest& request)
     return obj;
 }
 
+UniValue listwallets(const JSONRPCRequest& request)
+{
+    if (request.fHelp || request.params.size() != 0)
+        throw std::runtime_error(
+            "listwallets\n"
+            "Returns a list of currently loaded wallets.\n"
+            "For full information on the wallet, use \"getwalletinfo\"\n"
+            "\nResult:\n"
+            "[                         (json array of strings)\n"
+            "  \"walletname\"            (string) the wallet name\n"
+            "   ...\n"
+            "]\n"
+            "\nExamples:\n"
+            + HelpExampleCli("listwallets", "")
+            + HelpExampleRpc("listwallets", "")
+        );
+
+    UniValue obj(UniValue::VARR);
+
+    for (CWalletRef pwallet : vpwallets) {
+
+        if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
+            return NullUniValue;
+        }
+
+        LOCK(pwallet->cs_wallet);
+
+        obj.push_back(pwallet->GetName());
+    }
+
+    return obj;
+}
+
 UniValue resendwallettransactions(const JSONRPCRequest& request)
 {
     CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
@@ -3085,6 +3120,7 @@ static const CRPCCommand commands[] =
     { "wallet",             "listsinceblock",           &listsinceblock,           false,  {"blockhash","target_confirmations","include_watchonly"} },
     { "wallet",             "listtransactions",         &listtransactions,         false,  {"account","count","skip","include_watchonly"} },
     { "wallet",             "listunspent",              &listunspent,              false,  {"minconf","maxconf","addresses","include_unsafe","query_options"} },
+    { "wallet",             "listwallets",              &listwallets,              true,   {} },
     { "wallet",             "lockunspent",              &lockunspent,              true,   {"unlock","transactions"} },
     { "wallet",             "move",                     &movecmd,                  false,  {"fromaccount","toaccount","amount","minconf","comment"} },
     { "wallet",             "sendfrom",                 &sendfrom,                 false,  {"fromaccount","toaddress","amount","minconf","comment","comment_to"} },

src/wallet/wallet.h

@@ -1066,7 +1066,9 @@ public:
     //! Flush wallet (bitdb flush)
     void Flush(bool shutdown=false);
 
-    //! Verify the wallet database and perform salvage if required
+    //! Responsible for reading and validating the -wallet arguments and verifying the wallet database.
+    //  This function will perform salvage on the wallet if requested, as long as only one wallet is
+    //  being loaded (CWallet::ParameterInteraction forbids -salvagewallet, -zapwallettxes or -upgradewallet with multiwallet).
     static bool Verify();
     
     /** 

test/functional/multiwallet.py

@@ -2,9 +2,12 @@
 # Copyright (c) 2017 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-"""Test multiwallet."""
+"""Test multiwallet.
+
+Verify that a bitcoind node can load multiple wallet files
+"""
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import assert_equal, assert_raises_jsonrpc
 
 class MultiWalletTest(BitcoinTestFramework):
 
@@ -18,20 +21,28 @@ class MultiWalletTest(BitcoinTestFramework):
         w1 = self.nodes[0] / "wallet/w1"
         w1.generate(1)
 
-        #accessing wallet RPC without using wallet endpoint fails
+        # accessing wallet RPC without using wallet endpoint fails
         assert_raises_jsonrpc(-32601, "Method not found", self.nodes[0].getwalletinfo)
 
-        #check w1 wallet balance
-        walletinfo = w1.getwalletinfo()
-        assert_equal(walletinfo['immature_balance'], 50)
+        # check w1 wallet balance
+        w1_info = w1.getwalletinfo()
+        assert_equal(w1_info['immature_balance'], 50)
+        w1_name = w1_info['walletname']
+        assert_equal(w1_name, "w1")
 
-        #check w1 wallet balance
+        # check w1 wallet balance
         w2 = self.nodes[0] / "wallet/w2"
-        walletinfo = w2.getwalletinfo()
-        assert_equal(walletinfo['immature_balance'], 0)
+        w2_info = w2.getwalletinfo()
+        assert_equal(w2_info['immature_balance'], 0)
+        w2_name = w2_info['walletname']
+        assert_equal(w2_name, "w2")
 
         w3 = self.nodes[0] / "wallet/w3"
-        
+        w3_name = w3.getwalletinfo()['walletname']
+        assert_equal(w3_name, "w3")
+
+        assert_equal({"w1", "w2", "w3"}, {w1_name, w2_name, w3_name})
+
         w1.generate(101)
         assert_equal(w1.getbalance(), 100)
         assert_equal(w2.getbalance(), 0)

test/functional/test_runner.py

@@ -89,6 +89,7 @@ BASE_SCRIPTS= [
     'mempool_spendcoinbase.py',
     'mempool_reorg.py',
     'mempool_persist.py',
+    'multiwallet.py',
     'httpbasics.py',
     'multi_rpc.py',
     'proxy_test.py',