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import os, sh, sys, re
import random, socket, netifaces
from pathlib import Path
from itertools import islice
from loguru import logger
from harness.io import IOParser
gkfs_daemon_cmd = 'gkfs_daemon'
gkfs_client_cmd = 'gkfs.io'
gkfs_client_lib_file = 'libgkfs_intercept.so'
gkfs_hosts_file = 'gkfs_hosts.txt'
gkfs_daemon_log_file = 'gkfs_daemon.log'
gkfs_daemon_log_level = '100'
gkfs_client_log_file = 'gkfs_client.log'
gkfs_client_log_level = 'all'
def get_ip_addr(iface):
return netifaces.ifaddresses(iface)[netifaces.AF_INET][0]['addr']
def get_ephemeral_host():
"""
Returns a random IP in the 127.0.0.0/24. This decreases the likelihood of
races for ports by 255^3.
"""
res = '127.{}.{}.{}'.format(random.randrange(1, 255),
random.randrange(1, 255),
random.randrange(2, 255),)
return res
def get_ephemeral_port(port=0, host=None):
"""
Get an ephemeral socket at random from the kernel.
Parameters
----------
port: `str`
If specified, use this port as a base and the next free port after that
base will be returned.
host: `str`
If specified, use this host. Otherwise it will use a temporary IP in
the 127.0.0.0/24 range
Returns
-------
Available port to use
"""
if host is None:
host = get_ephemeral_host()
# Dynamic port-range:
# * cat /proc/sys/net/ipv4/ip_local_port_range
# 32768 61000
if port == 0:
port = random.randrange(1024, 32768)
while True:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((host, port))
port = s.getsockname()[1]
s.close()
return port
except socket.error:
port = random.randrange(1024, 32768)
def get_ephemeral_address(iface):
"""
Get an ephemeral network address (IPv4:port) from an interface
and a random port.
Parameters
----------
iface: `str`
The interface that will be used to find out the IPv4 address
for the ephemeral address.
Returns
-------
A network address formed by iface's IPv4 address and an available
randomly selected port.
"""
return f"{iface}:{get_ephemeral_port(host=get_ip_addr(iface))}"
class Daemon:
def __init__(self, interface, workspace):
self._address = get_ephemeral_address(interface)
self._workspace = workspace
self._cmd = sh.Command(gkfs_daemon_cmd, self._workspace.bindirs)
self._env = os.environ.copy()
self._patched_env = {
'LD_LIBRARY_PATH' : ':'.join([os.environ.get('LD_LIBRARY_PATH', '')] + [str(p) for p in self._workspace.libdirs]),
'GKFS_HOSTS_FILE' : self.cwd / gkfs_hosts_file,
'GKFS_DAEMON_LOG_PATH' : self.logdir / gkfs_daemon_log_file,
'GKFS_LOG_LEVEL' : gkfs_daemon_log_level,
}
self._env.update(self._patched_env)
def run(self):
args = [ '--mountdir', self.mountdir,
'--rootdir', self.rootdir,
'-l', self._address ]
logger.info(f"spawning daemon")
logger.info(f"cmdline: {self._cmd} " + " ".join(map(str, args)))
logger.info(f"env: {self._patched_env}")
self._proc = self._cmd(
args,
_env=self._env,
# _out=sys.stdout,
# _err=sys.stderr,
_bg=True,
)
logger.info(f"daemon process spawned (PID={self._proc.pid})")
# make sure daemon is ready to accept requests
if not self.wait_until_active(self._proc.pid):
raise RuntimeError("GKFS daemon doesn't seem to be active")
return self
def wait_until_active(self, pid, retries=500, max_lines=50):
"""
Waits until a GKFS daemon is active or until a certain number of retries
has been exhausted. Checks if the daemon is running by searching its
log for a pre-defined readiness message.
Parameters
----------
pid: `int`
The PID of the daemon process to wait for.
retries: `int`
The number of retries before giving up.
max_lines: `int`
The maximum number of log lines to check for a match.
Returns
-------
True if the message is found, False if the log file doesn't exist
or the message can't be found.
"""
pattern = r'Startup successful. Daemon is ready.'
is_active = False
# wait a bit for the daemon to initialize
sh.sleep(0.1)
r = 0
while not is_active and r < retries:
r += 1
try:
#logger.debug(f"checking log file")
with open(self.logdir / gkfs_daemon_log_file) as log:
for line in islice(log, max_lines):
if re.search(pattern, line) is not None:
return True
except FileNotFoundError:
# Log is missing, the daemon might have crashed...
logger.info(f"daemon log file missing, checking if daemon is alive")
pid=self._proc.pid
try:
sh.ps(['-h', '-p', pid])
except Exception:
logger.error(f"daemon process {pid} is not running")
raise
# ... or it might just be lazy. let's give it some more time
sh.sleep(0.05)
pass
return False
def shutdown(self):
logger.info(f"terminating daemon")
try:
self._proc.terminate()
err = self._proc.wait()
except sh.SignalException_SIGTERM:
pass
@property
def cwd(self):
return self._workspace.twd
@property
def rootdir(self):
return self._workspace.rootdir
@property
def mountdir(self):
return self._workspace.mountdir
@property
def logdir(self):
return self._workspace.logdir
@property
def interface(self):
return self._interface
class _proxy_exec():
def __init__(self, client, name):
self._client = client
self._name = name
def __call__(self, *args):
return self._client.run(self._name, *args)
class Client:
def __init__(self, workspace):
self._parser = IOParser()
self._workspace = workspace
self._cmd = sh.Command(gkfs_client_cmd, self._workspace.bindirs)
self._env = os.environ.copy()
self._patched_env = {
'LD_LIBRARY_PATH' : ':'.join([os.environ.get('LD_LIBRARY_PATH', '')] + [str(p) for p in self._workspace.libdirs]),
'LD_PRELOAD' : Path(gkfs_client_lib_file),
'LIBGKFS_HOSTS_FILE' : self.cwd / gkfs_hosts_file,
'LIBGKFS_LOG' : gkfs_client_log_level,
'LIBGKFS_LOG_OUTPUT' : self._workspace.logdir / gkfs_client_log_file
}
self._env.update(self._patched_env)
def run(self, cmd, *args):
logger.info(f"running client")
logger.info(f"cmdline: {self._cmd} " + " ".join(map(str, list(args))))
logger.info(f"env: {self._patched_env}")
out = self._cmd(
[ cmd ] + list(args),
_env = self._env,
# _out=sys.stdout,
# _err=sys.stderr,
)
logger.debug(f"command output: {out.stdout}")
return self._parser.parse(cmd, out.stdout)
def __getattr__(self, name):
return _proxy_exec(self, name)
@property
def cwd(self):
return self._workspace.twd