| import os,sys,logging |
| import signal, time |
| from xmlrpc.server import SimpleXMLRPCServer, SimpleXMLRPCRequestHandler |
| import threading |
| import queue |
| import socket |
| import io |
| |
| try: |
| import sqlite3 |
| except ImportError: |
| from pysqlite2 import dbapi2 as sqlite3 |
| |
| import bb.server.xmlrpc |
| import prserv |
| import prserv.db |
| import errno |
| |
| logger = logging.getLogger("BitBake.PRserv") |
| |
| if sys.hexversion < 0x020600F0: |
| print("Sorry, python 2.6 or later is required.") |
| sys.exit(1) |
| |
| class Handler(SimpleXMLRPCRequestHandler): |
| def _dispatch(self,method,params): |
| try: |
| value=self.server.funcs[method](*params) |
| except: |
| import traceback |
| traceback.print_exc() |
| raise |
| return value |
| |
| PIDPREFIX = "/tmp/PRServer_%s_%s.pid" |
| singleton = None |
| |
| |
| class PRServer(SimpleXMLRPCServer): |
| def __init__(self, dbfile, logfile, interface, daemon=True): |
| ''' constructor ''' |
| try: |
| SimpleXMLRPCServer.__init__(self, interface, |
| logRequests=False, allow_none=True) |
| except socket.error: |
| ip=socket.gethostbyname(interface[0]) |
| port=interface[1] |
| msg="PR Server unable to bind to %s:%s\n" % (ip, port) |
| sys.stderr.write(msg) |
| raise PRServiceConfigError |
| |
| self.dbfile=dbfile |
| self.daemon=daemon |
| self.logfile=logfile |
| self.working_thread=None |
| self.host, self.port = self.socket.getsockname() |
| self.pidfile=PIDPREFIX % (self.host, self.port) |
| |
| self.register_function(self.getPR, "getPR") |
| self.register_function(self.quit, "quit") |
| self.register_function(self.ping, "ping") |
| self.register_function(self.export, "export") |
| self.register_function(self.dump_db, "dump_db") |
| self.register_function(self.importone, "importone") |
| self.register_introspection_functions() |
| |
| self.requestqueue = queue.Queue() |
| self.handlerthread = threading.Thread(target = self.process_request_thread) |
| self.handlerthread.daemon = False |
| |
| def process_request_thread(self): |
| """Same as in BaseServer but as a thread. |
| |
| In addition, exception handling is done here. |
| |
| """ |
| iter_count = 1 |
| # 60 iterations between syncs or sync if dirty every ~30 seconds |
| iterations_between_sync = 60 |
| |
| bb.utils.set_process_name("PRServ Handler") |
| |
| while not self.quit: |
| try: |
| (request, client_address) = self.requestqueue.get(True, 30) |
| except queue.Empty: |
| self.table.sync_if_dirty() |
| continue |
| try: |
| self.finish_request(request, client_address) |
| self.shutdown_request(request) |
| iter_count = (iter_count + 1) % iterations_between_sync |
| if iter_count == 0: |
| self.table.sync_if_dirty() |
| except: |
| self.handle_error(request, client_address) |
| self.shutdown_request(request) |
| self.table.sync() |
| self.table.sync_if_dirty() |
| |
| def sigint_handler(self, signum, stack): |
| if self.table: |
| self.table.sync() |
| |
| def sigterm_handler(self, signum, stack): |
| if self.table: |
| self.table.sync() |
| self.quit=True |
| |
| def process_request(self, request, client_address): |
| self.requestqueue.put((request, client_address)) |
| |
| def export(self, version=None, pkgarch=None, checksum=None, colinfo=True): |
| try: |
| return self.table.export(version, pkgarch, checksum, colinfo) |
| except sqlite3.Error as exc: |
| logger.error(str(exc)) |
| return None |
| |
| def dump_db(self): |
| """ |
| Returns a script (string) that reconstructs the state of the |
| entire database at the time this function is called. The script |
| language is defined by the backing database engine, which is a |
| function of server configuration. |
| Returns None if the database engine does not support dumping to |
| script or if some other error is encountered in processing. |
| """ |
| buff = io.StringIO() |
| try: |
| self.table.sync() |
| self.table.dump_db(buff) |
| return buff.getvalue() |
| except Exception as exc: |
| logger.error(str(exc)) |
| return None |
| finally: |
| buff.close() |
| |
| def importone(self, version, pkgarch, checksum, value): |
| return self.table.importone(version, pkgarch, checksum, value) |
| |
| def ping(self): |
| return not self.quit |
| |
| def getinfo(self): |
| return (self.host, self.port) |
| |
| def getPR(self, version, pkgarch, checksum): |
| try: |
| return self.table.getValue(version, pkgarch, checksum) |
| except prserv.NotFoundError: |
| logger.error("can not find value for (%s, %s)",version, checksum) |
| return None |
| except sqlite3.Error as exc: |
| logger.error(str(exc)) |
| return None |
| |
| def quit(self): |
| self.quit=True |
| return |
| |
| def work_forever(self,): |
| self.quit = False |
| self.timeout = 0.5 |
| |
| bb.utils.set_process_name("PRServ") |
| |
| # DB connection must be created after all forks |
| self.db = prserv.db.PRData(self.dbfile) |
| self.table = self.db["PRMAIN"] |
| |
| logger.info("Started PRServer with DBfile: %s, IP: %s, PORT: %s, PID: %s" % |
| (self.dbfile, self.host, self.port, str(os.getpid()))) |
| |
| self.handlerthread.start() |
| while not self.quit: |
| self.handle_request() |
| self.handlerthread.join() |
| self.db.disconnect() |
| logger.info("PRServer: stopping...") |
| self.server_close() |
| return |
| |
| def start(self): |
| if self.daemon: |
| pid = self.daemonize() |
| else: |
| pid = self.fork() |
| |
| # Ensure both the parent sees this and the child from the work_forever log entry above |
| logger.info("Started PRServer with DBfile: %s, IP: %s, PORT: %s, PID: %s" % |
| (self.dbfile, self.host, self.port, str(pid))) |
| |
| def delpid(self): |
| os.remove(self.pidfile) |
| |
| def daemonize(self): |
| """ |
| 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)) |
| |
| self.cleanup_handles() |
| os._exit(0) |
| |
| def fork(self): |
| try: |
| pid = os.fork() |
| if pid > 0: |
| return pid |
| except OSError as e: |
| raise Exception("%s [%d]" % (e.strerror, e.errno)) |
| |
| bb.utils.signal_on_parent_exit("SIGTERM") |
| self.cleanup_handles() |
| os._exit(0) |
| |
| def cleanup_handles(self): |
| signal.signal(signal.SIGINT, self.sigint_handler) |
| signal.signal(signal.SIGTERM, self.sigterm_handler) |
| os.chdir("/") |
| |
| sys.stdout.flush() |
| sys.stderr.flush() |
| si = open('/dev/null', 'r') |
| so = open(self.logfile, 'a+') |
| se = so |
| os.dup2(si.fileno(),sys.stdin.fileno()) |
| os.dup2(so.fileno(),sys.stdout.fileno()) |
| os.dup2(se.fileno(),sys.stderr.fileno()) |
| |
| # 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()) |
| pf = open(self.pidfile, 'w') |
| pf.write("%s\n" % pid) |
| pf.close() |
| |
| self.work_forever() |
| self.delpid() |
| |
| class PRServSingleton(object): |
| def __init__(self, dbfile, logfile, interface): |
| self.dbfile = dbfile |
| self.logfile = logfile |
| self.interface = interface |
| self.host = None |
| self.port = None |
| |
| def start(self): |
| self.prserv = PRServer(self.dbfile, self.logfile, self.interface, daemon=False) |
| self.prserv.start() |
| self.host, self.port = self.prserv.getinfo() |
| |
| def getinfo(self): |
| return (self.host, self.port) |
| |
| class PRServerConnection(object): |
| def __init__(self, host, port): |
| if is_local_special(host, port): |
| host, port = singleton.getinfo() |
| self.host = host |
| self.port = port |
| self.connection, self.transport = bb.server.xmlrpc._create_server(self.host, self.port) |
| |
| def terminate(self): |
| try: |
| logger.info("Terminating PRServer...") |
| self.connection.quit() |
| except Exception as exc: |
| sys.stderr.write("%s\n" % str(exc)) |
| |
| def getPR(self, version, pkgarch, checksum): |
| return self.connection.getPR(version, pkgarch, checksum) |
| |
| def ping(self): |
| return self.connection.ping() |
| |
| def export(self,version=None, pkgarch=None, checksum=None, colinfo=True): |
| return self.connection.export(version, pkgarch, checksum, colinfo) |
| |
| def dump_db(self): |
| return self.connection.dump_db() |
| |
| def importone(self, version, pkgarch, checksum, value): |
| return self.connection.importone(version, pkgarch, checksum, value) |
| |
| def getinfo(self): |
| return self.host, self.port |
| |
| def start_daemon(dbfile, host, port, logfile): |
| ip = socket.gethostbyname(host) |
| pidfile = PIDPREFIX % (ip, port) |
| try: |
| pf = open(pidfile,'r') |
| pid = int(pf.readline().strip()) |
| pf.close() |
| except IOError: |
| pid = None |
| |
| if pid: |
| sys.stderr.write("pidfile %s already exist. Daemon already running?\n" |
| % pidfile) |
| return 1 |
| |
| server = PRServer(os.path.abspath(dbfile), os.path.abspath(logfile), (ip,port)) |
| server.start() |
| |
| # Sometimes, the port (i.e. localhost:0) indicated by the user does not match with |
| # the one the server actually is listening, so at least warn the user about it |
| _,rport = server.getinfo() |
| if port != rport: |
| sys.stdout.write("Server is listening at port %s instead of %s\n" |
| % (rport,port)) |
| return 0 |
| |
| def stop_daemon(host, port): |
| import glob |
| ip = socket.gethostbyname(host) |
| pidfile = PIDPREFIX % (ip, port) |
| try: |
| pf = open(pidfile,'r') |
| pid = int(pf.readline().strip()) |
| pf.close() |
| 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: |
| PRServerConnection(ip, port).terminate() |
| except: |
| logger.critical("Stop PRService %s:%d failed" % (host,port)) |
| |
| try: |
| if pid: |
| wait_timeout = 0 |
| print("Waiting for pr-server to exit.") |
| while is_running(pid) and wait_timeout < 50: |
| time.sleep(0.1) |
| wait_timeout += 1 |
| |
| 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.strip().upper() == 'localhost'.upper() 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', True) or '').split(':'))) |
| if not host_params: |
| return None |
| |
| if len(host_params) != 2: |
| logger.critical('\n'.join(['PRSERV_HOST: incorrect format', |
| 'Usage: PRSERV_HOST = "<hostname>:<port>"'])) |
| raise PRServiceConfigError |
| |
| if is_local_special(host_params[0], int(host_params[1])) and not singleton: |
| import bb.utils |
| cachedir = (d.getVar("PERSISTENT_DIR", True) or d.getVar("CACHE", True)) |
| if not cachedir: |
| logger.critical("Please set the 'PERSISTENT_DIR' or 'CACHE' variable") |
| raise PRServiceConfigError |
| bb.utils.mkdirhier(cachedir) |
| dbfile = os.path.join(cachedir, "prserv.sqlite3") |
| logfile = os.path.join(cachedir, "prserv.log") |
| singleton = PRServSingleton(os.path.abspath(dbfile), os.path.abspath(logfile), ("localhost",0)) |
| singleton.start() |
| if singleton: |
| host, port = singleton.getinfo() |
| else: |
| host = host_params[0] |
| port = int(host_params[1]) |
| |
| try: |
| connection = PRServerConnection(host,port) |
| connection.ping() |
| realhost, realport = connection.getinfo() |
| return str(realhost) + ":" + str(realport) |
| |
| except Exception: |
| logger.critical("PRservice %s:%d not available" % (host, port)) |
| raise PRServiceConfigError |
| |
| def auto_shutdown(d=None): |
| global singleton |
| if singleton: |
| host, port = singleton.getinfo() |
| try: |
| PRServerConnection(host, port).terminate() |
| except: |
| logger.critical("Stop PRService %s:%d failed" % (host,port)) |
| singleton = None |
| |
| def ping(host, port): |
| conn=PRServerConnection(host, port) |
| return conn.ping() |