aboutsummaryrefslogtreecommitdiffstats
path: root/lib/prserv/serv.py
blob: 316512d7ac72b0e74a25209000f784085214c113 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
import os,sys,logging
import signal, time, atexit, threading
from SimpleXMLRPCServer import SimpleXMLRPCServer, SimpleXMLRPCRequestHandler
import xmlrpclib

try:
    import sqlite3
except ImportError:
    from pysqlite2 import dbapi2 as sqlite3

import bb.server.xmlrpc
import prserv
import prserv.db

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 '''
        SimpleXMLRPCServer.__init__(self, interface,
                                    requestHandler=SimpleXMLRPCRequestHandler,
                                    logRequests=False, allow_none=True)
        self.dbfile=dbfile
        self.daemon=daemon
        self.logfile=logfile
        self.working_thread=None
        self.host, self.port = self.socket.getsockname()
        self.db=prserv.db.PRData(dbfile)
        self.table=self.db["PRMAIN"]
        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.importone, "importone")
        self.register_introspection_functions()

    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 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
        logger.info("PRServer: started! DBfile: %s, IP: %s, PORT: %s, PID: %s" %
                     (self.dbfile, self.host, self.port, str(os.getpid())))

        while not self.quit:
            self.handle_request()

        logger.info("PRServer: stopping...")
        self.server_close()
        return

    def start(self):
        if self.daemon is True:
            logger.info("PRServer: try to start daemon...")
            self.daemonize()
        else:
            atexit.register(self.delpid)
            pid = str(os.getpid()) 
            pf = file(self.pidfile, 'w+')
            pf.write("%s\n" % pid)
            pf.close()
            self.work_forever()

    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:
                #parent return instead of exit to give control 
                return
        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
                sys.exit(0)
        except OSError as e:
            raise Exception("%s [%d]" % (e.strerror, e.errno))

        os.umask(0)
        os.chdir("/")

        sys.stdout.flush()
        sys.stderr.flush()
        si = file('/dev/null', 'r')
        so = file(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())

        # write pidfile
        atexit.register(self.delpid)
        pid = str(os.getpid()) 
        pf = file(self.pidfile, 'w')
        pf.write("%s\n" % pid)
        pf.close()

        self.work_forever()
        sys.exit(0)

class PRServSingleton():
    def __init__(self, dbfile, logfile, interface):
        self.dbfile = dbfile
        self.logfile = logfile
        self.interface = interface
        self.host = None
        self.port = None
        self.event = threading.Event()

    def _work(self):
        self.prserv = PRServer(self.dbfile, self.logfile, self.interface, False)
        self.host, self.port = self.prserv.getinfo()
        self.event.set()
        self.prserv.work_forever()
        del self.prserv.db

    def start(self):
        self.working_thread = threading.Thread(target=self._work)
        self.working_thread.start()

    def getinfo(self):
        self.event.wait()
        return (self.host, self.port)

class PRServerConnection():
    def __init__(self, host, port):
        if is_local_special(host, port):
            host, port = singleton.getinfo()
        self.host = host
        self.port = port
        self.connection = bb.server.xmlrpc._create_server(self.host, self.port)

    def terminate(self):
        # Don't wait for server indefinitely
        import socket
        socket.setdefaulttimeout(2)
        try:
            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 importone(self, version, pkgarch, checksum, value):
        return self.connection.importone(version, pkgarch, checksum, value)

def start_daemon(dbfile, host, port, logfile):
    pidfile = PIDPREFIX % (host, port)
    try:
        pf = file(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), (host,port))
    server.start()
    return 0

def stop_daemon(host, port):
    pidfile = PIDPREFIX % (host, port)
    try:
        pf = file(pidfile,'r')
        pid = int(pf.readline().strip())
        pf.close()
    except IOError:
        pid = None

    if not pid:
        sys.stderr.write("pidfile %s does not exist. Daemon not running?\n"
                        % pidfile)

    try:
        PRServerConnection(host, port).terminate()
    except:
        logger.critical("Stop PRService %s:%d failed" % (host,port))
    time.sleep(0.5)

    try:
        if pid:
            if os.path.exists(pidfile):
                os.remove(pidfile)
            os.kill(pid,signal.SIGTERM)
            time.sleep(0.1)
    except OSError as e:
        err = str(e)
        if err.find("No such process") <= 0:
            raise e

    return 0

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
    if (not d.getVar('PRSERV_HOST', True)) or (not d.getVar('PRSERV_PORT', True)):
        return

    if is_local_special(d.getVar('PRSERV_HOST', True), int(d.getVar('PRSERV_PORT', True))) 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 = d.getVar('PRSERV_HOST', True)
        port = int(d.getVar('PRSERV_PORT', True))

    try:
        return PRServerConnection(host,port).ping()
    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()