logging: cli options to filter for modules using -v

old style "-v" still works

filtering examples:
-v=debug,network=error,interface=error      // effectively blacklists network and interface
-v=warning,network=debug,interface=debug    // effectively whitelists network and interface

electrum/__init__.py

@@ -1,5 +1,5 @@
 from .version import ELECTRUM_VERSION
-from .util import format_satoshis, set_verbosity
+from .util import format_satoshis
 from .wallet import Wallet
 from .storage import WalletStorage
 from .coinchooser import COIN_CHOOSERS

electrum/commands.py

@@ -927,9 +927,7 @@ def add_network_options(parser):
 
 def add_global_options(parser):
     group = parser.add_argument_group('global options')
-    # const is for when no argument is given to verbosity
-    # default is for when the flag is missing
-    group.add_argument("-v", dest="verbosity", help="Set verbosity filter", default='', const='*', nargs='?')
+    group.add_argument("-v", dest="verbosity", help="Set verbosity filter", default='')
     group.add_argument("-D", "--dir", dest="electrum_path", help="electrum directory")
     group.add_argument("-P", "--portable", action="store_true", dest="portable", default=False, help="Use local 'electrum_data' directory")
     group.add_argument("-w", "--wallet", dest="wallet_path", help="wallet path")

electrum/gui/stdio.py

@@ -1,12 +1,14 @@
 from decimal import Decimal
 import getpass
 import datetime
+import logging
 
 from electrum import WalletStorage, Wallet
-from electrum.util import format_satoshis, set_verbosity
+from electrum.util import format_satoshis
 from electrum.bitcoin import is_address, COIN, TYPE_ADDRESS
 from electrum.transaction import TxOutput
 from electrum.network import TxBroadcastError, BestEffortRequestFailed
+from electrum.logging import console_stderr_handler
 
 _ = lambda x:x  # i18n
 
@@ -30,7 +32,7 @@ def __init__(self, config, daemon, plugins):
         self.done = 0
         self.last_balance = ""
 
-        set_verbosity(False)
+        console_stderr_handler.setLevel(logging.CRITICAL)
 
         self.str_recipient = ""
         self.str_description = ""

electrum/gui/text.py

@@ -5,15 +5,17 @@
 import locale
 from decimal import Decimal
 import getpass
+import logging
 
 import electrum
-from electrum.util import format_satoshis, set_verbosity
+from electrum.util import format_satoshis
 from electrum.bitcoin import is_address, COIN, TYPE_ADDRESS
 from electrum.transaction import TxOutput
 from electrum.wallet import Wallet
 from electrum.storage import WalletStorage
 from electrum.network import NetworkParameters, TxBroadcastError, BestEffortRequestFailed
 from electrum.interface import deserialize_server
+from electrum.logging import console_stderr_handler
 
 _ = lambda x:x  # i18n
 
@@ -52,7 +54,7 @@ def __init__(self, config, daemon, plugins):
         self.set_cursor(0)
         self.w = curses.newwin(10, 50, 5, 5)
 
-        set_verbosity(False)
+        console_stderr_handler.setLevel(logging.CRITICAL)
         self.tab = 0
         self.pos = 0
         self.popup_pos = 0

electrum/interface.py

@@ -182,7 +182,6 @@ def serialize_server(host: str, port: Union[str, int], protocol: str) -> str:
 
 
 class Interface(Logger):
-    verbosity_filter = 'i'
 
     def __init__(self, network: 'Network', server: str, proxy: Optional[dict]):
         self.ready = asyncio.Future()

electrum/logging.py

@@ -64,6 +64,31 @@ def _configure_file_logging(log_directory: pathlib.Path):
     root_logger.addHandler(file_handler)
 
 
+def _configure_verbosity(config):
+    verbosity = config.get('verbosity')
+    if not verbosity:
+        return
+    console_stderr_handler.setLevel(logging.DEBUG)
+    if verbosity == '*' or not isinstance(verbosity, str):
+        return
+    # example verbosity:
+    #   debug,network=error,interface=error      // effectively blacklists network and interface
+    #   warning,network=debug,interface=debug    // effectively whitelists network and interface
+    filters = verbosity.split(',')
+    for filt in filters:
+        if not filt: continue
+        items = filt.split('=')
+        if len(items) == 1:
+            level = items[0]
+            electrum_logger.setLevel(level.upper())
+        elif len(items) == 2:
+            logger_name, level = items
+            logger = get_logger(logger_name)
+            logger.setLevel(level.upper())
+        else:
+            raise Exception(f"invalid log filter: {filt}")
+
+
 # --- External API
 
 def get_logger(name: str) -> logging.Logger:
@@ -73,6 +98,7 @@ def get_logger(name: str) -> logging.Logger:
 
 
 _logger = get_logger(__name__)
+_logger.setLevel(logging.INFO)
 
 
 class Logger:
@@ -98,8 +124,7 @@ def diagnostic_name(self):
 
 
 def configure_logging(config):
-    if config.get('verbosity'):
-        console_stderr_handler.setLevel(logging.DEBUG)
+    _configure_verbosity(config)
 
     is_android = 'ANDROID_DATA' in os.environ
     if is_android or config.get('disablefilelogging'):

electrum/network.py

@@ -223,7 +223,6 @@ class Network(Logger):
     """The Network class manages a set of connections to remote electrum
     servers, each connected socket is handled by an Interface() object.
     """
-    verbosity_filter = 'n'
 
     def __init__(self, config: SimpleConfig=None):
         global INSTANCE

electrum/plugin.py

@@ -47,7 +47,6 @@
 
 
 class Plugins(DaemonThread):
-    verbosity_filter = 'p'
 
     @profiler
     def __init__(self, config: SimpleConfig, gui_name):

electrum/util.py

@@ -218,29 +218,6 @@ def default(self, obj):
             return list(obj)
         return super().default(obj)
 
-class PrintError(object):
-    '''A handy base class'''
-    verbosity_filter = ''
-
-    def diagnostic_name(self):
-        return ''
-
-    def log_name(self):
-        msg = self.verbosity_filter or self.__class__.__name__
-        d = self.diagnostic_name()
-        if d: msg += "][" + d
-        return "[%s]" % msg
-
-    def print_error(self, *msg):
-        if self.verbosity_filter in verbosity or verbosity == '*':
-            print_error(self.log_name(), *msg)
-
-    def print_stderr(self, *msg):
-        print_stderr(self.log_name(), *msg)
-
-    def print_msg(self, *msg):
-        print_msg(self.log_name(), *msg)
-
 
 class ThreadJob(Logger):
     """A job that is run periodically from a thread's main loop.  run() is
@@ -282,7 +259,6 @@ def run(self):
 
 class DaemonThread(threading.Thread, Logger):
     """ daemon thread that terminates cleanly """
-    verbosity_filter = 'd'
 
     def __init__(self):
         threading.Thread.__init__(self)
@@ -334,19 +310,6 @@ def on_stop(self):
         self.logger.info("stopped")
 
 
-verbosity = ''
-def set_verbosity(filters: Union[str, bool]):
-    global verbosity
-    if type(filters) is bool:  # backwards compat
-        verbosity = '*' if filters else ''
-        return
-    verbosity = filters
-
-
-def print_error(*args):
-    if not verbosity: return
-    print_stderr(*args)
-
 def print_stderr(*args):
     args = [str(item) for item in args]
     sys.stderr.write(" ".join(args) + "\n")

electrum/wallet.py

@@ -203,7 +203,6 @@ class Abstract_Wallet(AddressSynchronizer):
 
     max_change_outputs = 3
     gap_limit_for_change = 6
-    verbosity_filter = 'w'
 
     def __init__(self, storage: WalletStorage):
         if storage.requires_upgrade():

electrum/x509.py

@@ -345,6 +345,5 @@ def load_certificates(ca_path):
 if __name__ == "__main__":
     import certifi
 
-    util.set_verbosity(True)
     ca_path = certifi.where()
     ca_list, ca_keyID = load_certificates(ca_path)

run_electrum

@@ -83,7 +83,7 @@ from electrum import SimpleConfig
 from electrum.wallet import Wallet
 from electrum.storage import WalletStorage, get_derivation_used_for_hw_device_encryption
 from electrum.util import print_msg, print_stderr, json_encode, json_decode, UserCancelled
-from electrum.util import set_verbosity, InvalidPassword
+from electrum.util import InvalidPassword
 from electrum.commands import get_parser, known_commands, Commands, config_variables
 from electrum import daemon
 from electrum import keystore
@@ -277,6 +277,9 @@ if __name__ == '__main__':
         sys.argv.append('-h')
 
     # old '-v' syntax
+    # Due to this workaround that keeps old -v working,
+    # more advanced usages of -v need to use '-v='.
+    # e.g. -v=debug,network=warning,interface=error
     try:
         i = sys.argv.index('-v')
     except ValueError:
@@ -324,10 +327,7 @@ if __name__ == '__main__':
     if config_options.get('portable'):
         config_options['electrum_path'] = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'electrum_data')
 
-    # kivy sometimes freezes when we write to sys.stderr
-    log_verbosity = config_options.get('verbosity') if config_options.get('gui') != 'kivy' else ''
-    set_verbosity(log_verbosity)
-    if not log_verbosity:
+    if not config_options.get('verbosity'):
         warnings.simplefilter('ignore', DeprecationWarning)
 
     # check uri