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# vim:fileencoding=utf-8:noet
from __future__ import (unicode_literals, division, absolute_import, print_function)
from threading import Thread, Lock, Event
from types import MethodType
from powerline.lib.monotonic import monotonic
from powerline.segments import Segment
class MultiRunnedThread(object):
daemon = True
def __init__(self):
self.thread = None
def is_alive(self):
return self.thread and self.thread.is_alive()
def start(self):
self.shutdown_event.clear()
self.thread = Thread(target=self.run)
self.thread.daemon = self.daemon
self.thread.start()
def join(self, *args, **kwargs):
if self.thread:
return self.thread.join(*args, **kwargs)
return None
class ThreadedSegment(Segment, MultiRunnedThread):
min_sleep_time = 0.1
update_first = True
interval = 1
daemon = False
argmethods = ('render', 'set_state')
def __init__(self):
super(ThreadedSegment, self).__init__()
self.run_once = True
self.crashed = False
self.crashed_value = None
self.update_value = None
self.updated = False
def __call__(self, pl, update_first=True, **kwargs):
if self.run_once:
self.pl = pl
self.set_state(**kwargs)
update_value = self.get_update_value(True)
elif not self.is_alive():
# Without this we will not have to wait long until receiving bug “I
# opened vim, but branch information is only shown after I move
# cursor”.
#
# If running once .update() is called in __call__.
self.start()
update_value = self.get_update_value(self.do_update_first)
else:
update_value = self.get_update_value(not self.updated)
if self.crashed:
return self.crashed_value
return self.render(update_value, update_first=update_first, pl=pl, **kwargs)
def set_update_value(self):
try:
self.update_value = self.update(self.update_value)
except Exception as e:
self.exception('Exception while updating: {0}', str(e))
self.crashed = True
except KeyboardInterrupt:
self.warn('Caught keyboard interrupt while updating')
self.crashed = True
else:
self.crashed = False
self.updated = True
def get_update_value(self, update=False):
if update:
self.set_update_value()
return self.update_value
def run(self):
if self.do_update_first:
start_time = monotonic()
while True:
self.shutdown_event.wait(max(self.interval - (monotonic() - start_time), self.min_sleep_time))
if self.shutdown_event.is_set():
break
start_time = monotonic()
self.set_update_value()
else:
while not self.shutdown_event.is_set():
start_time = monotonic()
self.set_update_value()
self.shutdown_event.wait(max(self.interval - (monotonic() - start_time), self.min_sleep_time))
def shutdown(self):
self.shutdown_event.set()
if self.daemon and self.is_alive():
# Give the worker thread a chance to shutdown, but don’t block for
# too long
self.join(0.01)
def set_interval(self, interval=None):
# Allowing “interval” keyword in configuration.
# Note: Here **kwargs is needed to support foreign data, in subclasses
# it can be seen in a number of places in order to support
# .set_interval().
interval = interval or getattr(self, 'interval')
self.interval = interval
def set_state(self, interval=None, update_first=True, shutdown_event=None, **kwargs):
self.set_interval(interval)
self.shutdown_event = shutdown_event or Event()
self.do_update_first = update_first and self.update_first
self.updated = self.updated or (not self.do_update_first)
def startup(self, pl, **kwargs):
self.run_once = False
self.pl = pl
self.daemon = pl.use_daemon_threads
self.set_state(**kwargs)
if not self.is_alive():
self.start()
def critical(self, *args, **kwargs):
self.pl.critical(prefix=self.__class__.__name__, *args, **kwargs)
def exception(self, *args, **kwargs):
self.pl.exception(prefix=self.__class__.__name__, *args, **kwargs)
def info(self, *args, **kwargs):
self.pl.info(prefix=self.__class__.__name__, *args, **kwargs)
def error(self, *args, **kwargs):
self.pl.error(prefix=self.__class__.__name__, *args, **kwargs)
def warn(self, *args, **kwargs):
self.pl.warn(prefix=self.__class__.__name__, *args, **kwargs)
def debug(self, *args, **kwargs):
self.pl.debug(prefix=self.__class__.__name__, *args, **kwargs)
def argspecobjs(self):
for name in self.argmethods:
try:
yield name, getattr(self, name)
except AttributeError:
pass
def additional_args(self):
return (('interval', self.interval),)
_omitted_args = {
'render': (0,),
'set_state': ('shutdown_event',),
}
def omitted_args(self, name, method):
ret = self._omitted_args.get(name, ())
if isinstance(getattr(self, name, None), MethodType):
ret = tuple((i + 1 if isinstance(i, int) else i for i in ret))
return ret
class KwThreadedSegment(ThreadedSegment):
update_first = True
argmethods = ('render', 'set_state', 'key', 'render_one')
def __init__(self):
super(KwThreadedSegment, self).__init__()
self.updated = True
self.update_value = ({}, set())
self.write_lock = Lock()
self.new_queries = []
@staticmethod
def key(**kwargs):
return frozenset(kwargs.items())
def render(self, update_value, update_first, key=None, after_update=False, **kwargs):
queries, crashed = update_value
if key is None:
key = self.key(**kwargs)
if key in crashed:
return self.crashed_value
try:
update_state = queries[key][1]
except KeyError:
with self.write_lock:
self.new_queries.append(key)
if self.do_update_first or self.run_once:
if after_update:
self.error('internal error: value was not computed even though update_first was set')
update_state = None
else:
return self.render(
update_value=self.get_update_value(True),
update_first=False,
key=key,
after_update=True,
**kwargs
)
else:
update_state = None
return self.render_one(update_state, **kwargs)
def update_one(self, crashed, updates, key):
try:
updates[key] = (monotonic(), self.compute_state(key))
except Exception as e:
self.exception('Exception while computing state for {0!r}: {1}', key, str(e))
crashed.add(key)
except KeyboardInterrupt:
self.warn('Interrupt while computing state for {0!r}', key)
crashed.add(key)
def update(self, old_update_value):
updates = {}
crashed = set()
update_value = (updates, crashed)
queries = old_update_value[0]
new_queries = self.new_queries
with self.write_lock:
self.new_queries = []
for key, (last_query_time, state) in queries.items():
if last_query_time < monotonic() < last_query_time + self.interval:
updates[key] = (last_query_time, state)
else:
self.update_one(crashed, updates, key)
for key in new_queries:
self.update_one(crashed, updates, key)
return update_value
def set_state(self, interval=None, update_first=True, shutdown_event=None, **kwargs):
self.set_interval(interval)
self.do_update_first = update_first and self.update_first
self.shutdown_event = shutdown_event or Event()
@staticmethod
def render_one(update_state, **kwargs):
return update_state
_omitted_args = {
'render': ('update_value', 'key', 'after_update'),
'set_state': ('shutdown_event',),
'render_one': (0,),
}
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