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# Copyright (c) 2016 Uber Technologies, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import socket
import struct
from logging import Logger
import time
from typing import Any, Optional
class ErrorReporter(object):
"""
Reports errors by emitting metrics, and if logger is provided,
logging the error message once every log_interval_minutes
N.B. metrics will be deprecated in the future
"""
def __init__(
self, metrics: Any, logger: Optional[Logger] = None, log_interval_minutes: int = 15
):
self.logger = logger
self.log_interval_minutes = log_interval_minutes
self._last_error_reported_at = time.time()
def error(self, *args: Any) -> None:
if self.logger is None:
return
next_logging_deadline = \
self._last_error_reported_at + (self.log_interval_minutes * 60)
current_time = time.time()
if next_logging_deadline >= current_time:
# If we aren't yet at the next logging deadline
return
self.logger.error(*args)
self._last_error_reported_at = current_time
def get_boolean(string: str, default: bool) -> bool:
string = str(string).lower()
if string in ['false', '0', 'none']:
return False
elif string in ['true', '1']:
return True
else:
return default
def local_ip() -> Optional[str]:
"""Get the local network IP of this machine"""
ip: Optional[str]
try:
ip = socket.gethostbyname(socket.gethostname())
except IOError:
ip = socket.gethostbyname('localhost')
if ip.startswith('127.'):
ip = get_local_ip_by_interfaces()
if ip is None:
ip = get_local_ip_by_socket()
return ip
def get_local_ip_by_socket() -> Optional[str]:
# Explanation : https://stackoverflow.com/questions/166506
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
# doesn't even have to be reachable
s.connect(('10.255.255.255', 1))
ip = s.getsockname()[0]
except IOError:
ip = None
finally:
s.close()
return ip
def get_local_ip_by_interfaces() -> Optional[str]:
ip = None
# Check eth0, eth1, eth2, en0, ...
interfaces = [
i + bytes(n) for i in (b'eth', b'en', b'wlan') for n in range(3)
] # :(
for interface in interfaces:
try:
ip = interface_ip(interface)
if ip is not None:
break
except IOError:
pass
return ip
def interface_ip(interface: bytes) -> Optional[str]:
try:
import fcntl
"""Determine the IP assigned to us by the given network interface."""
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
return socket.inet_ntoa(
fcntl.ioctl(
sock.fileno(), 0x8915, struct.pack('256s', interface[:15])
)[20:24]
)
except ImportError:
return None
# Explanation:
# http://stackoverflow.com/questions/11735821/python-get-localhost-ip
# http://stackoverflow.com/questions/24196932/how-can-i-get-the-ip-address-of-eth0-in-python
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