No longer shutdown after encrypting the wallet

Since the database environment is flushed, closed, and reopened during
EncryptWallet, there is no need to shut down the software anymore.

Github-Pull: #12493
Rebased-From: c1dde3a

src/qt/askpassphrasedialog.cpp

@@ -123,16 +123,15 @@ void AskPassphraseDialog::accept()
                 {
                     QMessageBox::warning(this, tr("Wallet encrypted"),
                                          "<qt>" +
-                                         tr("%1 will close now to finish the encryption process. "
+                                         tr("Your wallet is now encrypted. "
                                          "Remember that encrypting your wallet cannot fully protect "
-                                         "your bitcoins from being stolen by malware infecting your computer.").arg(tr(PACKAGE_NAME)) +
+                                         "your bitcoins from being stolen by malware infecting your computer.") +
                                          "<br><br><b>" +
                                          tr("IMPORTANT: Any previous backups you have made of your wallet file "
                                          "should be replaced with the newly generated, encrypted wallet file. "
                                          "For security reasons, previous backups of the unencrypted wallet file "
                                          "will become useless as soon as you start using the new, encrypted wallet.") +
                                          "</b></qt>");
-                    QApplication::quit();
                 }
                 else
                 {

src/wallet/rpcwallet.cpp

@@ -2740,7 +2740,6 @@ static UniValue encryptwallet(const JSONRPCRequest& request)
             "will require the passphrase to be set prior the making these calls.\n"
             "Use the walletpassphrase call for this, and then walletlock call.\n"
             "If the wallet is already encrypted, use the walletpassphrasechange call.\n"
-            "Note that this will shutdown the server.\n"
             "\nArguments:\n"
             "1. \"passphrase\"    (string) The pass phrase to encrypt the wallet with. It must be at least 1 character, but should be long.\n"
             "\nExamples:\n"
@@ -2778,11 +2777,7 @@ static UniValue encryptwallet(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_WALLET_ENCRYPTION_FAILED, "Error: Failed to encrypt the wallet.");
     }
 
-    // BDB seems to have a bad habit of writing old data into
-    // slack space in .dat files; that is bad if the old data is
-    // unencrypted private keys. So:
-    StartShutdown();
-    return "wallet encrypted; Bitcoin server stopping, restart to run with encrypted wallet. The keypool has been flushed and a new HD seed was generated (if you are using HD). You need to make a new backup.";
+    return "wallet encrypted; The keypool has been flushed and a new HD seed was generated (if you are using HD). You need to make a new backup.";
 }
 
 static UniValue lockunspent(const JSONRPCRequest& request)

test/functional/rpc_fundrawtransaction.py

@@ -478,10 +478,8 @@ class RawTransactionsTest(BitcoinTestFramework):
 
         ############################################################
         # locked wallet test
-        self.stop_node(0)
-        self.nodes[1].node_encrypt_wallet("test")
-        self.stop_node(2)
-        self.stop_node(3)
+        self.nodes[1].encryptwallet("test")
+        self.stop_nodes()
 
         self.start_nodes()
         # This test is not meant to test fee estimation and we'd like

test/functional/test_framework/test_node.py

@@ -305,14 +305,6 @@ class TestNode():
                     assert_msg = "bitcoind should have exited with expected error " + expected_msg
                 self._raise_assertion_error(assert_msg)
 
-    def node_encrypt_wallet(self, passphrase):
-        """"Encrypts the wallet.
-
-        This causes bitcoind to shutdown, so this method takes
-        care of cleaning up resources."""
-        self.encryptwallet(passphrase)
-        self.wait_until_stopped()
-
     def add_p2p_connection(self, p2p_conn, *, wait_for_verack=True, **kwargs):
         """Add a p2p connection to the node.
 

test/functional/wallet_bumpfee.py

@@ -41,8 +41,7 @@ class BumpFeeTest(BitcoinTestFramework):
 
     def run_test(self):
         # Encrypt wallet for test_locked_wallet_fails test
-        self.nodes[1].node_encrypt_wallet(WALLET_PASSPHRASE)
-        self.start_node(1)
+        self.nodes[1].encryptwallet(WALLET_PASSPHRASE)
         self.nodes[1].walletpassphrase(WALLET_PASSPHRASE, WALLET_PASSPHRASE_TIMEOUT)
 
         connect_nodes_bi(self.nodes, 0, 1)

test/functional/wallet_dump.py

@@ -128,8 +128,7 @@ class WalletDumpTest(BitcoinTestFramework):
         assert_equal(witness_addr_ret, witness_addr)  # p2sh-p2wsh address added to the first key
 
         #encrypt wallet, restart, unlock and dump
-        self.nodes[0].node_encrypt_wallet('test')
-        self.start_node(0)
+        self.nodes[0].encryptwallet('test')
         self.nodes[0].walletpassphrase('test', 10)
         # Should be a no-op:
         self.nodes[0].keypoolrefill()

test/functional/wallet_encryption.py

@@ -33,8 +33,7 @@ class WalletEncryptionTest(BitcoinTestFramework):
         assert_equal(len(privkey), 52)
 
         # Encrypt the wallet
-        self.nodes[0].node_encrypt_wallet(passphrase)
-        self.start_node(0)
+        self.nodes[0].encryptwallet(passphrase)
 
         # Test that the wallet is encrypted
         assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].dumpprivkey, address)

test/functional/wallet_keypool.py

@@ -25,9 +25,7 @@ class KeyPoolTest(BitcoinTestFramework):
         assert(addr_before_encrypting_data['hdseedid'] == wallet_info_old['hdseedid'])
 
         # Encrypt wallet and wait to terminate
-        nodes[0].node_encrypt_wallet('test')
-        # Restart node 0
-        self.start_node(0)
+        nodes[0].encryptwallet('test')
         # Keep creating keys
         addr = nodes[0].getnewaddress()
         addr_data = nodes[0].getaddressinfo(addr)