wallet: background sync with just the view key

- When background syncing, the wallet wipes the spend key
from memory and processes all new transactions. The wallet saves
all receives, spends, and "plausible" spends of receives the
wallet does not know key images for.
- When background sync disabled, the wallet processes all
background synced txs and then clears the background sync cache.
- Adding "plausible" spends to the background sync cache ensures
that the wallet does not need to query the daemon to see if any
received outputs were spent while background sync was enabled.
This would harm privacy especially for users of 3rd party daemons.
- To enable the feature in the CLI wallet, the user can set
background-sync to reuse-wallet-password or
custom-background-password and the wallet automatically syncs in
the background when the wallet locks, then processes all
background synced txs when the wallet is unlocked.
- The custom-background-password option enables the user to
open a distinct background wallet that only has a view key saved
and can be opened/closed/synced separately from the main wallet.
When the main wallet opens, it processes the background wallet's
cache.
- To enable the feature in the RPC wallet, there is a new
`/setup_background_sync` endpoint.
- HW, multsig and view-only wallets cannot background sync.

tests/functional_tests/wallet.py

@@ -34,8 +34,7 @@
 
 from __future__ import print_function
 import sys
-import os
-import errno
+import util_resources
 
 from framework.wallet import Wallet
 from framework.daemon import Daemon
@@ -54,24 +53,6 @@ class WalletTest():
       self.change_password()
       self.store()
 
-    def remove_file(self, name):
-        WALLET_DIRECTORY = os.environ['WALLET_DIRECTORY']
-        assert WALLET_DIRECTORY != ''
-        try:
-            os.unlink(WALLET_DIRECTORY + '/' + name)
-        except OSError as e:
-            if e.errno != errno.ENOENT:
-                raise
-
-    def remove_wallet_files(self, name):
-        for suffix in ['', '.keys']:
-            self.remove_file(name + suffix)
-
-    def file_exists(self, name):
-        WALLET_DIRECTORY = os.environ['WALLET_DIRECTORY']
-        assert WALLET_DIRECTORY != ''
-        return os.path.isfile(WALLET_DIRECTORY + '/' + name)
-
     def reset(self):
         print('Resetting blockchain')
         daemon = Daemon()
@@ -333,7 +314,7 @@ class WalletTest():
         try: wallet.close_wallet()
         except: pass
 
-        self.remove_wallet_files('test1')
+        util_resources.remove_wallet_files('test1')
 
         seed = 'velvet lymph giddy number token physics poetry unquoted nibs useful sabotage limits benches lifestyle eden nitrogen anvil fewest avoid batch vials washing fences goat unquoted'
         res = wallet.restore_deterministic_wallet(seed = seed, filename = 'test1')
@@ -359,7 +340,7 @@ class WalletTest():
 
         wallet.close_wallet()
 
-        self.remove_wallet_files('test1')
+        util_resources.remove_wallet_files('test1')
 
     def store(self):
         print('Testing store')
@@ -369,22 +350,26 @@ class WalletTest():
         try: wallet.close_wallet()
         except: pass
 
-        self.remove_wallet_files('test1')
+        util_resources.remove_wallet_files('test1')
 
         seed = 'velvet lymph giddy number token physics poetry unquoted nibs useful sabotage limits benches lifestyle eden nitrogen anvil fewest avoid batch vials washing fences goat unquoted'
         res = wallet.restore_deterministic_wallet(seed = seed, filename = 'test1')
         assert res.address == '42ey1afDFnn4886T7196doS9GPMzexD9gXpsZJDwVjeRVdFCSoHnv7KPbBeGpzJBzHRCAs9UxqeoyFQMYbqSWYTfJJQAWDm'
         assert res.seed == seed
 
-        self.remove_file('test1')
-        assert self.file_exists('test1.keys')
-        assert not self.file_exists('test1')
+        util_resources.remove_file('test1')
+        assert util_resources.file_exists('test1.keys')
+        assert not util_resources.file_exists('test1')
         wallet.store()
-        assert self.file_exists('test1.keys')
-        assert self.file_exists('test1')
+        assert util_resources.file_exists('test1.keys')
+        assert util_resources.file_exists('test1')
 
         wallet.close_wallet()
-        self.remove_wallet_files('test1')
+
+        wallet.open_wallet(filename = 'test1', password = '')
+        wallet.close_wallet()
+
+        util_resources.remove_wallet_files('test1')
 
 
 if __name__ == '__main__':