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#
# SPDX-License-Identifier: GPL-2.0-only
#
import os,sys,logging
import signal, time
import socket
import io
import sqlite3
import prserv
import prserv.db
import errno
import bb.asyncrpc
logger = logging.getLogger("BitBake.PRserv")
PIDPREFIX = "/tmp/PRServer_%s_%s.pid"
singleton = None
class PRServerClient(bb.asyncrpc.AsyncServerConnection):
def __init__(self, reader, writer, table, read_only):
super().__init__(reader, writer, 'PRSERVICE', logger)
self.handlers.update({
'get-pr': self.handle_get_pr,
'import-one': self.handle_import_one,
'export': self.handle_export,
'is-readonly': self.handle_is_readonly,
})
self.table = table
self.read_only = read_only
def validate_proto_version(self):
return (self.proto_version == (1, 0))
async def dispatch_message(self, msg):
try:
await super().dispatch_message(msg)
except:
self.table.sync()
raise
self.table.sync_if_dirty()
async def handle_get_pr(self, request):
version = request['version']
pkgarch = request['pkgarch']
checksum = request['checksum']
response = None
try:
value = self.table.getValue(version, pkgarch, checksum)
response = {'value': value}
except prserv.NotFoundError:
logger.error("can not find value for (%s, %s)",version, checksum)
except sqlite3.Error as exc:
logger.error(str(exc))
self.write_message(response)
async def handle_import_one(self, request):
response = None
if not self.read_only:
version = request['version']
pkgarch = request['pkgarch']
checksum = request['checksum']
value = request['value']
value = self.table.importone(version, pkgarch, checksum, value)
if value is not None:
response = {'value': value}
self.write_message(response)
async def handle_export(self, request):
version = request['version']
pkgarch = request['pkgarch']
checksum = request['checksum']
colinfo = request['colinfo']
try:
(metainfo, datainfo) = self.table.export(version, pkgarch, checksum, colinfo)
except sqlite3.Error as exc:
logger.error(str(exc))
metainfo = datainfo = None
response = {'metainfo': metainfo, 'datainfo': datainfo}
self.write_message(response)
async def handle_is_readonly(self, request):
response = {'readonly': self.read_only}
self.write_message(response)
class PRServer(bb.asyncrpc.AsyncServer):
def __init__(self, dbfile, read_only=False):
super().__init__(logger)
self.dbfile = dbfile
self.table = None
self.read_only = read_only
def accept_client(self, reader, writer):
return PRServerClient(reader, writer, self.table, self.read_only)
def _serve_forever(self):
self.db = prserv.db.PRData(self.dbfile, read_only=self.read_only)
self.table = self.db["PRMAIN"]
logger.info("Started PRServer with DBfile: %s, Address: %s, PID: %s" %
(self.dbfile, self.address, str(os.getpid())))
super()._serve_forever()
self.table.sync_if_dirty()
self.db.disconnect()
def signal_handler(self):
super().signal_handler()
if self.table:
self.table.sync()
class PRServSingleton(object):
def __init__(self, dbfile, logfile, host, port):
self.dbfile = dbfile
self.logfile = logfile
self.host = host
self.port = port
def start(self):
self.prserv = PRServer(self.dbfile)
self.prserv.start_tcp_server(socket.gethostbyname(self.host), self.port)
self.process = self.prserv.serve_as_process()
if not self.prserv.address:
raise PRServiceConfigError
if not self.port:
self.port = int(self.prserv.address.rsplit(':', 1)[1])
def run_as_daemon(func, pidfile, logfile):
"""
See Advanced Programming in the UNIX, Sec 13.3
"""
try:
pid = os.fork()
if pid > 0:
os.waitpid(pid, 0)
#parent return instead of exit to give control
return pid
except OSError as e:
raise Exception("%s [%d]" % (e.strerror, e.errno))
os.setsid()
"""
fork again to make sure the daemon is not session leader,
which prevents it from acquiring controlling terminal
"""
try:
pid = os.fork()
if pid > 0: #parent
os._exit(0)
except OSError as e:
raise Exception("%s [%d]" % (e.strerror, e.errno))
os.chdir("/")
sys.stdout.flush()
sys.stderr.flush()
# We could be called from a python thread with io.StringIO as
# stdout/stderr or it could be 'real' unix fd forking where we need
# to physically close the fds to prevent the program launching us from
# potentially hanging on a pipe. Handle both cases.
si = open('/dev/null', 'r')
try:
os.dup2(si.fileno(),sys.stdin.fileno())
except (AttributeError, io.UnsupportedOperation):
sys.stdin = si
so = open(logfile, 'a+')
try:
os.dup2(so.fileno(),sys.stdout.fileno())
except (AttributeError, io.UnsupportedOperation):
sys.stdout = so
try:
os.dup2(so.fileno(),sys.stderr.fileno())
except (AttributeError, io.UnsupportedOperation):
sys.stderr = so
# Clear out all log handlers prior to the fork() to avoid calling
# event handlers not part of the PRserver
for logger_iter in logging.Logger.manager.loggerDict.keys():
logging.getLogger(logger_iter).handlers = []
# Ensure logging makes it to the logfile
streamhandler = logging.StreamHandler()
streamhandler.setLevel(logging.DEBUG)
formatter = bb.msg.BBLogFormatter("%(levelname)s: %(message)s")
streamhandler.setFormatter(formatter)
logger.addHandler(streamhandler)
# write pidfile
pid = str(os.getpid())
with open(pidfile, 'w') as pf:
pf.write("%s\n" % pid)
func()
os.remove(pidfile)
os._exit(0)
def start_daemon(dbfile, host, port, logfile, read_only=False):
ip = socket.gethostbyname(host)
pidfile = PIDPREFIX % (ip, port)
try:
with open(pidfile) as pf:
pid = int(pf.readline().strip())
except IOError:
pid = None
if pid:
sys.stderr.write("pidfile %s already exist. Daemon already running?\n"
% pidfile)
return 1
dbfile = os.path.abspath(dbfile)
def daemon_main():
server = PRServer(dbfile, read_only=read_only)
server.start_tcp_server(ip, port)
server.serve_forever()
run_as_daemon(daemon_main, pidfile, os.path.abspath(logfile))
return 0
def stop_daemon(host, port):
import glob
ip = socket.gethostbyname(host)
pidfile = PIDPREFIX % (ip, port)
try:
with open(pidfile) as pf:
pid = int(pf.readline().strip())
except IOError:
pid = None
if not pid:
# when server starts at port=0 (i.e. localhost:0), server actually takes another port,
# so at least advise the user which ports the corresponding server is listening
ports = []
portstr = ""
for pf in glob.glob(PIDPREFIX % (ip,'*')):
bn = os.path.basename(pf)
root, _ = os.path.splitext(bn)
ports.append(root.split('_')[-1])
if len(ports):
portstr = "Wrong port? Other ports listening at %s: %s" % (host, ' '.join(ports))
sys.stderr.write("pidfile %s does not exist. Daemon not running? %s\n"
% (pidfile,portstr))
return 1
try:
if is_running(pid):
print("Sending SIGTERM to pr-server.")
os.kill(pid, signal.SIGTERM)
time.sleep(0.1)
if os.path.exists(pidfile):
os.remove(pidfile)
except OSError as e:
err = str(e)
if err.find("No such process") <= 0:
raise e
return 0
def is_running(pid):
try:
os.kill(pid, 0)
except OSError as err:
if err.errno == errno.ESRCH:
return False
return True
def is_local_special(host, port):
if (host == 'localhost' or host == '127.0.0.1') and not port:
return True
else:
return False
class PRServiceConfigError(Exception):
pass
def auto_start(d):
global singleton
host_params = list(filter(None, (d.getVar('PRSERV_HOST') or '').split(':')))
if not host_params:
# Shutdown any existing PR Server
auto_shutdown()
return None
if len(host_params) != 2:
# Shutdown any existing PR Server
auto_shutdown()
logger.critical('\n'.join(['PRSERV_HOST: incorrect format',
'Usage: PRSERV_HOST = "<hostname>:<port>"']))
raise PRServiceConfigError
host = host_params[0].strip().lower()
port = int(host_params[1])
if is_local_special(host, port):
import bb.utils
cachedir = (d.getVar("PERSISTENT_DIR") or d.getVar("CACHE"))
if not cachedir:
logger.critical("Please set the 'PERSISTENT_DIR' or 'CACHE' variable")
raise PRServiceConfigError
dbfile = os.path.join(cachedir, "prserv.sqlite3")
logfile = os.path.join(cachedir, "prserv.log")
if singleton:
if singleton.dbfile != dbfile:
# Shutdown any existing PR Server as doesn't match config
auto_shutdown()
if not singleton:
bb.utils.mkdirhier(cachedir)
singleton = PRServSingleton(os.path.abspath(dbfile), os.path.abspath(logfile), host, port)
singleton.start()
if singleton:
host = singleton.host
port = singleton.port
try:
ping(host, port)
return str(host) + ":" + str(port)
except Exception:
logger.critical("PRservice %s:%d not available" % (host, port))
raise PRServiceConfigError
def auto_shutdown():
global singleton
if singleton and singleton.process:
singleton.process.terminate()
singleton.process.join()
singleton = None
def ping(host, port):
from . import client
conn = client.PRClient()
conn.connect_tcp(host, port)
return conn.ping()
def connect(host, port):
from . import client
global singleton
if host.strip().lower() == 'localhost' and not port:
host = 'localhost'
port = singleton.port
conn = client.PRClient()
conn.connect_tcp(host, port)
return conn
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