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import json
import socket
import time
import subprocess
import traceback
import logging
import string
import random
from collections import namedtuple
from enum import Enum
from datetime import datetime
from typing import Tuple, Optional, List
from zlib import adler32
Addr = namedtuple('Addr', 'host, port')
logger = logging.getLogger(__name__)
# https://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks
def chunks(lst, n):
"""Yield successive n-sized chunks from lst."""
for i in range(0, len(lst), n):
yield lst[i:i + n]
def json_serial(obj):
"""JSON serializer for datetime objects"""
if isinstance(obj, datetime):
return obj.timestamp()
if isinstance(obj, Enum):
return obj.value
raise TypeError("Type %s not serializable" % type(obj))
def stringify(v) -> str:
return json.dumps(v, separators=(',', ':'), default=json_serial)
def ipv4_valid(ip: str) -> bool:
try:
socket.inet_aton(ip)
return True
except socket.error:
return False
def parse_addr(addr: str) -> Addr:
if addr.count(':') != 1:
raise ValueError('invalid host:port format')
host, port = addr.split(':')
if not ipv4_valid(host):
raise ValueError('invalid ipv4 address')
port = int(port)
if not 0 <= port <= 65535:
raise ValueError('invalid port')
return Addr(host, port)
def strgen(n: int):
return ''.join(random.choices(string.ascii_letters + string.digits, k=n))
class MySimpleSocketClient:
host: str
port: int
def __init__(self, host: str, port: int):
self.host = host
self.port = port
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.connect((self.host, self.port))
self.sock.settimeout(5)
def __del__(self):
self.sock.close()
def write(self, line: str) -> None:
self.sock.sendall((line + '\r\n').encode())
def read(self) -> str:
buf = bytearray()
while True:
buf.extend(self.sock.recv(256))
if b'\r\n' in buf:
break
response = buf.decode().strip()
return response
def send_datagram(message: str, addr: Addr) -> None:
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.sendto(message.encode(), addr)
def format_tb(exc) -> Optional[List[str]]:
tb = traceback.format_tb(exc.__traceback__)
if not tb:
return None
tb = list(map(lambda s: s.strip(), tb))
tb.reverse()
if tb[0][-1:] == ':':
tb[0] = tb[0][:-1]
return tb
class ChildProcessInfo:
pid: int
cmd: str
def __init__(self,
pid: int,
cmd: str):
self.pid = pid
self.cmd = cmd
def find_child_processes(ppid: int) -> List[ChildProcessInfo]:
p = subprocess.run(['pgrep', '-P', str(ppid), '--list-full'], capture_output=True)
if p.returncode != 0:
raise OSError(f'pgrep returned {p.returncode}')
children = []
lines = p.stdout.decode().strip().split('\n')
for line in lines:
try:
space_idx = line.index(' ')
except ValueError as exc:
logger.exception(exc)
continue
pid = int(line[0:space_idx])
cmd = line[space_idx+1:]
children.append(ChildProcessInfo(pid, cmd))
return children
class Stopwatch:
elapsed: float
time_started: Optional[float]
def __init__(self):
self.elapsed = 0
self.time_started = None
def go(self):
if self.time_started is not None:
raise StopwatchError('stopwatch was already started')
self.time_started = time.time()
def pause(self):
if self.time_started is None:
raise StopwatchError('stopwatch was paused')
self.elapsed += time.time() - self.time_started
self.time_started = None
def get_elapsed_time(self):
elapsed = self.elapsed
if self.time_started is not None:
elapsed += time.time() - self.time_started
return elapsed
def reset(self):
self.time_started = None
self.elapsed = 0
def is_paused(self):
return self.time_started is None
class StopwatchError(RuntimeError):
pass
def filesize_fmt(num, suffix="B") -> str:
for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]:
if abs(num) < 1024.0:
return f"{num:3.1f} {unit}{suffix}"
num /= 1024.0
return f"{num:.1f} Yi{suffix}"
class HashableEnum(Enum):
def hash(self) -> int:
return adler32(self.name.encode())
def next_tick_gen(freq):
t = time.time()
while True:
t += freq
yield max(t - time.time(), 0)
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