Allow accessing basic wallet info without blockchain source

jmclient/jmclient/wallet.py

@@ -71,6 +71,9 @@ def estimate_tx_fee(ins, outs, txtype='p2pkh'):
     for a transaction with the given number of inputs and outputs,
     based on information from the blockchain interface.
     '''
+    if jm_single().bc_interface is None:
+        raise RuntimeError("Cannot estimate transaction fee " +
+            "without blockchain source.")
     fee_per_kb = jm_single().bc_interface.estimate_fee_per_kb(
                 jm_single().config.getint("POLICY","tx_fees"))
     absurd_fee = jm_single().config.getint("POLICY", "absurd_fee_per_kb")

jmclient/jmclient/wallet_service.py

@@ -39,7 +39,11 @@ class WalletService(Service):
         self.bci = jm_single().bc_interface
         # keep track of the quasi-real-time blockheight
         # (updated in main monitor loop)
-        self.update_blockheight()
+        if self.bci is not None:
+            self.update_blockheight()
+        else:
+            jlog.warning("No blockchain source available, " +
+                "wallet tools will not show correct balances.")
         self.wallet = wallet
         self.synced = False
 
@@ -108,8 +112,9 @@ class WalletService(Service):
         """ Ensures wallet sync is complete
         before the main event loop starts.
         """
-        d = task.deferLater(reactor, 0.0, self.sync_wallet)
-        d.addCallback(self.start_wallet_monitoring)
+        if self.bci is not None:
+            d = task.deferLater(reactor, 0.0, self.sync_wallet)
+            d.addCallback(self.start_wallet_monitoring)
 
     def register_callbacks(self, callbacks, txinfo, cb_type="all"):
         """ Register callbacks that will be called by the

jmclient/jmclient/wallet_utils.py

@@ -1232,7 +1232,7 @@ def wallet_tool_main(wallet_root_path):
         # the service will not be started since this is a synchronous script:
         wallet_service = WalletService(wallet)
 
-        if method not in noscan_methods:
+        if method not in noscan_methods and jm_single().bc_interface is not None:
             # if nothing was configured, we override bitcoind's options so that
             # unconfirmed balance is included in the wallet display by default
             if 'listunspent_args' not in jm_single().config.options('POLICY'):

jmclient/jmclient/yieldgenerator.py

@@ -12,7 +12,7 @@ from jmclient import Maker, jm_single, load_program_config, \
     JMClientProtocolFactory, start_reactor, calc_cj_fee, \
     WalletService, add_base_options
 from .wallet_utils import open_test_wallet_maybe, get_wallet_path
-from jmbase.support import EXIT_ARGERROR
+from jmbase.support import EXIT_ARGERROR, EXIT_FAILURE
 
 jlog = get_log()
 
@@ -239,6 +239,11 @@ def ygmain(ygclass, txfee=1000, cjfee_a=200, cjfee_r=0.002, ordertype='swreloffe
 
     load_program_config(config_path=options.datadir)
 
+    if jm_single().bc_interface is None:
+        jlog.error("Running yield generator requires configured " +
+            "blockchain source.")
+        sys.exit(EXIT_FAILURE)
+
     wallet_path = get_wallet_path(wallet_name, None)
     wallet = open_test_wallet_maybe(
         wallet_path, wallet_name, options.mixdepth,

scripts/joinmarket-qt.py

@@ -572,6 +572,9 @@ class SpendTab(QWidget):
             self.startJoin()
 
     def startMultiple(self):
+        if jm_single().bc_interface is None:
+            log.info("Cannot start join, blockchain source not available.")
+            return
         if not self.spendstate.runstate == 'ready':
             log.info("Cannot start join, already running.")
             return
@@ -651,7 +654,7 @@ class SpendTab(QWidget):
         try:
             amount = btc.amount_to_sat(self.amountInput.text())
         except ValueError as e:
-            JMQtMessageBox(parent, e.args[0], title="Error", mbtype="warn")
+            JMQtMessageBox(self, e.args[0], title="Error", mbtype="warn")
             return
         makercount = int(self.numCPInput.text())
         mixdepth = int(self.mixdepthInput.text())
@@ -987,6 +990,12 @@ class SpendTab(QWidget):
         self.tumbler_destaddrs = None
 
     def validateSettings(self):
+        if jm_single().bc_interface is None:
+            JMQtMessageBox(
+                self,
+                "Sending coins not possible without blockchain source.",
+                mbtype='warn', title="Error")
+            return False
         valid, errmsg = validate_address(
             str(self.addressInput.text().strip()))
         if not valid:
@@ -1310,11 +1319,17 @@ class JMWalletTab(QWidget):
                 self.wallet_name = os.path.basename(
                     mainWindow.wallet_service.get_storage_location())
             if total_bal is None:
-                total_bal = " (syncing..)"
+                if jm_single().bc_interface is not None:
+                    total_bal = " (syncing..)"
+                else:
+                    total_bal = " (unknown, no blockchain source available)"
             self.label1.setText("CURRENT WALLET: " + self.wallet_name +
                                 ', total balance: ' + total_bal)
             l.show()
 
+        if jm_single().bc_interface is None and self.wallet_name != 'NONE':
+            return
+
         for i in range(nm):
             if walletinfo:
                 mdbalance = mbalances[i]
@@ -1718,6 +1733,12 @@ class JMMainWindow(QMainWindow):
             self.walletRefresh.stop()
 
         self.wallet_service = WalletService(wallet)
+
+        if jm_single().bc_interface is None:
+            self.centralWidget().widget(0).updateWalletInfo(
+                get_wallet_printout(self.wallet_service))
+            return True
+
         # add information callbacks:
         self.wallet_service.add_restart_callback(self.restartWithMsg)
         self.wallet_service.autofreeze_warning_cb = self.autofreeze_warning_cb
@@ -1925,15 +1946,16 @@ except Exception as e:
              ])
     JMQtMessageBox(None, config_load_error, mbtype='crit', title='failed to load')
     sys.exit(EXIT_FAILURE)
-# Qt does not currently support any functioning without a Core interface:
+# Only partial functionality (see wallet info, change config) is possible
+# without a blockchain interface.
 if jm_single().bc_interface is None:
-    blockchain_error = ''.join(["Joinmarket-Qt requires Bitcoin Core as a blockchain ",
-                                "interface; change the setting of 'blockchain_source' ",
-                                "in the joinmarket.cfg file to a value not equal to ",
-                                "'no-blockchain'; see comments for details."])
-    JMQtMessageBox(None, blockchain_error, mbtype='crit',
-                   title='Invalid blockchain source')
-    sys.exit(EXIT_FAILURE)
+    blockchain_warning = ''.join([
+        "No blockchain source currently configured. ",
+        "You will be able to see wallet information and change configuration ",
+        "but other functionality will be limited. ",
+        "Go to the 'Settings' tab and configure blockchain settings there."])
+    JMQtMessageBox(None, blockchain_warning, mbtype='warn',
+        title='No blockchain source')
 #refuse to load non-segwit wallet (needs extra work in wallet-utils).
 if not jm_single().config.get("POLICY", "segwit") == "true":
     wallet_load_error = ''.join(["Joinmarket-Qt only supports segwit based wallets, ",

scripts/tumbler.py

@@ -31,6 +31,10 @@ def main():
         sys.exit(EXIT_ARGERROR)
     load_program_config(config_path=options['datadir'])
 
+    if jm_single().bc_interface is None:
+        jmprint('Error: Needs a blockchain source', "error")
+        sys.exit(EXIT_FAILURE)
+
     check_regtest()
 
     #Load the wallet