support binding the http server to a unix socket file instead of TCP socket

cps.py

@@ -28,8 +28,8 @@ sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), 'vendor
 
 
 from cps import create_app
+from cps import web_server
 from cps.opds import opds
-from cps import Server
 from cps.web import web
 from cps.jinjia import jinjia
 from cps.about import about
@@ -56,7 +56,8 @@ def main():
     app.register_blueprint(editbook)
     if oauth_available:
         app.register_blueprint(oauth)
-    Server.startServer()
+    success = web_server.start()
+    sys.exit(0 if success else 1)
 
 
 if __name__ == '__main__':

cps/__init__.py

@@ -84,8 +84,8 @@ searched_ids = {}
 from .worker import WorkerThread
 global_WorkerThread = WorkerThread()
 
-from .server import server
-Server = server()
+from .server import WebServer
+web_server = WebServer()
 
 from .ldap import Ldap
 ldap = Ldap()
@@ -103,7 +103,7 @@ def create_app():
     Principal(app)
     lm.init_app(app)
     app.secret_key = os.getenv('SECRET_KEY', 'A0Zr98j/3yX R~XHH!jmN]LWX/,?RT')
-    Server.init_app(app)
+    web_server.init_app(app, config)
     db.setup_db()
     babel.init_app(app)
     ldap.init_app(app)

cps/about.py

@@ -41,8 +41,9 @@ from jinja2 import __version__  as jinja2Version
 from pytz import __version__ as pytzVersion
 from sqlalchemy import __version__ as sqlalchemyVersion
 
-from . import db, converter, Server, uploader
+from . import db, converter, uploader
 from .isoLanguages import __version__ as iso639Version
+from .server import VERSION as serverVersion
 from .web import render_title_template
 
 
@@ -71,7 +72,7 @@ def stats():
     versions['pySqlite'] = 'v' + db.engine.dialect.dbapi.version
     versions['Sqlite'] = 'v' + db.engine.dialect.dbapi.sqlite_version
     versions.update(converter.versioncheck())
-    versions.update(Server.getNameVersion())
+    versions.update(serverVersion)
     versions['Python'] = sys.version
     return render_title_template('stats.html', bookcounter=counter, authorcounter=authors, versions=versions,
                                  categorycounter=categorys, seriecounter=series, title=_(u"Statistics"), page="stat")

cps/admin.py

@@ -41,7 +41,7 @@ from sqlalchemy.exc import IntegrityError
 from werkzeug.security import generate_password_hash
 
 from . import constants, logger, ldap
-from . import db, ub, Server, get_locale, config, updater_thread, babel, gdriveutils
+from . import db, ub, web_server, get_locale, config, updater_thread, babel, gdriveutils
 from .helper import speaking_language, check_valid_domain, check_unrar, send_test_mail, generate_random_password, \
                     send_registration_mail
 from .gdriveutils import is_gdrive_ready, gdrive_support, downloadFile, deleteDatabaseOnChange, listRootFolders
@@ -102,12 +102,10 @@ def shutdown():
         showtext = {}
         if task == 0:
             showtext['text'] = _(u'Server restarted, please reload page')
-            Server.setRestartTyp(True)
         else:
             showtext['text'] = _(u'Performing shutdown of server, please close window')
-            Server.setRestartTyp(False)
         # stop gevent/tornado server
-        Server.stopServer()
+        web_server.stop(task == 0)
         return json.dumps(showtext)
     else:
         if task == 2:
@@ -220,8 +218,7 @@ def view_configuration():
             # ub.session.close()
             # ub.engine.dispose()
             # stop Server
-            Server.setRestartTyp(True)
-            Server.stopServer()
+            web_server.stop(True)
             log.info('Reboot required, restarting')
     readColumn = db.session.query(db.Custom_Columns)\
             .filter(and_(db.Custom_Columns.datatype == 'bool',db.Custom_Columns.mark_for_delete == 0)).all()
@@ -554,8 +551,7 @@ def configuration_helper(origin):
                                              title=_(u"Basic Configuration"), page="config")
         if reboot_required:
             # stop Server
-            Server.setRestartTyp(True)
-            Server.stopServer()
+            web_server.stop(True)
             log.info('Reboot required, restarting')
         if origin:
             success = True

cps/logger.py

@@ -25,6 +25,7 @@ from logging.handlers import RotatingFileHandler
 
 from .constants import BASE_DIR as _BASE_DIR
 
+
 ACCESS_FORMATTER_GEVENT  = Formatter("%(message)s")
 ACCESS_FORMATTER_TORNADO = Formatter("[%(asctime)s] %(message)s")
 
@@ -33,7 +34,6 @@ DEFAULT_LOG_LEVEL   = logging.INFO
 DEFAULT_LOG_FILE    = os.path.join(_BASE_DIR, "calibre-web.log")
 DEFAULT_ACCESS_LOG  = os.path.join(_BASE_DIR, "access.log")
 LOG_TO_STDERR       = '/dev/stderr'
-DEFAULT_ACCESS_LEVEL= logging.INFO
 
 logging.addLevelName(logging.WARNING, "WARN")
 logging.addLevelName(logging.CRITICAL, "CRIT")
@@ -73,35 +73,26 @@ def is_valid_logfile(file_path):
     return (not log_dir) or os.path.isdir(log_dir)
 
 
-def setup(log_file, log_level=None, logger=None):
-    if logger != "access" and logger != "tornado.access":
-        formatter = FORMATTER
-        default_file = DEFAULT_LOG_FILE
-    else:
-        if logger == "tornado.access":
-            formatter = ACCESS_FORMATTER_TORNADO
-        else:
-            formatter = ACCESS_FORMATTER_GEVENT
-        default_file = DEFAULT_ACCESS_LOG
+def _absolute_log_file(log_file, default_log_file):
     if log_file:
         if not os.path.dirname(log_file):
             log_file = os.path.join(_BASE_DIR, log_file)
-        log_file = os.path.abspath(log_file)
-    else:
-        log_file = LOG_TO_STDERR
-        # log_file = default_file
+        return os.path.abspath(log_file)
+
+    return default_log_file
+
+
+def setup(log_file, log_level=None):
+    '''
+    Configure the logging output.
+    May be called multiple times.
+    '''
+    log_file = _absolute_log_file(log_file, DEFAULT_LOG_FILE)
 
-    # print ('%r -- %r' % (log_level, log_file))
-    if logger != "access" and logger != "tornado.access":
     r = logging.root
-    else:
-        r = logging.getLogger(logger)
-        r.propagate = False
     r.setLevel(log_level or DEFAULT_LOG_LEVEL)
 
     previous_handler = r.handlers[0] if r.handlers else None
-    # print ('previous %r' % previous_handler)
-
     if previous_handler:
         # if the log_file has not changed, don't create a new handler
         if getattr(previous_handler, 'baseFilename', None) == log_file:
@@ -115,16 +106,32 @@ def setup(log_file, log_level=None, logger=None):
         try:
             file_handler = RotatingFileHandler(log_file, maxBytes=50000, backupCount=2)
         except IOError:
-            if log_file == default_file:
+            if log_file == DEFAULT_LOG_FILE:
                 raise
-            file_handler = RotatingFileHandler(default_file, maxBytes=50000, backupCount=2)
-    file_handler.setFormatter(formatter)
+            file_handler = RotatingFileHandler(DEFAULT_LOG_FILE, maxBytes=50000, backupCount=2)
+    file_handler.setFormatter(FORMATTER)
 
     for h in r.handlers:
         r.removeHandler(h)
         h.close()
     r.addHandler(file_handler)
-    # print ('new handler %r' % file_handler)
+
+
+def create_access_log(log_file, log_name, formatter):
+    '''
+    One-time configuration for the web server's access log.
+    '''
+    log_file = _absolute_log_file(log_file, DEFAULT_ACCESS_LOG)
+    logging.debug("access log: %s", log_file)
+
+    access_log = logging.getLogger(log_name)
+    access_log.propagate = False
+    access_log.setLevel(logging.INFO)
+
+    file_handler = RotatingFileHandler(log_file, maxBytes=50000, backupCount=2)
+    file_handler.setFormatter(formatter)
+    access_log.addHandler(file_handler)
+    return access_log
 
 
 # Enable logging of smtp lib debug output

cps/server.py

@@ -20,54 +20,55 @@
 from __future__ import division, print_function, unicode_literals
 import sys
 import os
+import errno
 import signal
 import socket
-import logging
 
 try:
     from gevent.pywsgi import WSGIServer
     from gevent.pool import Pool
-    from gevent import __version__ as geventVersion
-    gevent_present = True
+    from gevent import __version__ as _version
+    VERSION = {'Gevent': 'v' + _version}
+    _GEVENT = True
 except ImportError:
     from tornado.wsgi import WSGIContainer
     from tornado.httpserver import HTTPServer
     from tornado.ioloop import IOLoop
-    from tornado import version as tornadoVersion
-    from tornado import log as tornadoLog
-    from tornado import options as tornadoOptions
-    gevent_present = False
+    from tornado import version as _version
+    VERSION = {'Tornado': 'v' + _version}
+    _GEVENT = False
 
-from . import logger, config, global_WorkerThread
+from . import logger, global_WorkerThread
 
 
 log = logger.create()
 
 
-class server:
-
-    wsgiserver = None
-    restart = False
-    app = None
-    access_logger = None
+class WebServer:
 
     def __init__(self):
-        signal.signal(signal.SIGINT, self.killServer)
-        signal.signal(signal.SIGTERM, self.killServer)
+        signal.signal(signal.SIGINT, self._killServer)
+        signal.signal(signal.SIGTERM, self._killServer)
 
-    def init_app(self, application):
-        self.app = application
-        self.port = config.config_port
-        self.listening = config.get_config_ipaddress(readable=True) + ":" + str(self.port)
+        self.wsgiserver = None
         self.access_logger = None
-        if config.config_access_log:
-            if gevent_present:
-                logger.setup(config.config_access_logfile, logger.DEFAULT_ACCESS_LEVEL, "access")
-                self.access_logger = logging.getLogger("access")
-            else:
-                logger.setup(config.config_access_logfile, logger.DEFAULT_ACCESS_LEVEL, "tornado.access")
-
+        self.restart = False
+        self.app = None
+        self.listen_address = None
+        self.listen_port = None
+        self.unix_socket_file = None
         self.ssl_args = None
+
+    def init_app(self, application, config):
+        self.app = application
+        self.listen_address = config.get_config_ipaddress()
+        self.listen_port = config.config_port
+
+        if config.config_access_log:
+            log_name = "gevent.access" if _GEVENT else "tornado.access"
+            formatter = logger.ACCESS_FORMATTER_GEVENT if _GEVENT else logger.ACCESS_FORMATTER_TORNADO
+            self.access_logger = logger.create_access_log(config.config_access_logfile, log_name, formatter)
+
         certfile_path = config.get_config_certfile()
         keyfile_path = config.get_config_keyfile()
         if certfile_path and keyfile_path:
@@ -79,22 +80,46 @@ class server:
                 log.warning('Cert path: %s', certfile_path)
                 log.warning('Key path:  %s', keyfile_path)
 
-    def _make_gevent_socket(self):
-        if config.get_config_ipaddress():
-            return (config.get_config_ipaddress(), self.port)
-        if os.name == 'nt':
-            return ('0.0.0.0', self.port)
+    def _make_gevent_unix_socket(self, socket_file):
+        # the socket file must not exist prior to bind()
+        if os.path.exists(socket_file):
+            # avoid nuking regular files and symbolic links (could be a mistype or security issue)
+            if os.path.isfile(socket_file) or os.path.islink(socket_file):
+                raise OSError(errno.EEXIST, os.strerror(errno.EEXIST), socket_file)
+            os.remove(socket_file)
 
+        unix_sock = WSGIServer.get_listener(socket_file, family=socket.AF_UNIX)
+        self.unix_socket_file = socket_file
+
+        # ensure current user and group have r/w permissions, no permissions for other users
+        # this way the socket can be shared in a semi-secure manner
+        # between the user running calibre-web and the user running the fronting webserver
+        os.chmod(socket_file, 0o660);
+
+        return unix_sock
+
+    def _make_gevent_socket(self):
+        if os.name != 'nt':
+            unix_socket_file = os.environ.get("CALIBRE_UNIX_SOCKET")
+            if unix_socket_file:
+                return self._make_gevent_unix_socket(unix_socket_file)
+
+        if self.listen_address:
+            return (self.listen_address, self.listen_port)
+
+        if os.name == 'nt':
+            return ('0.0.0.0', self.listen_port)
+
+        address = ('', self.listen_port)
         try:
-            s = WSGIServer.get_listener(('', self.port), family=socket.AF_INET6)
+            sock = WSGIServer.get_listener(address, family=socket.AF_INET6)
         except socket.error as ex:
             log.error('%s', ex)
             log.warning('Unable to listen on \'\', trying on IPv4 only...')
-            s = WSGIServer.get_listener(('', self.port), family=socket.AF_INET)
-        log.debug("%r %r", s._sock, s._sock.getsockname())
-        return s
+            sock = WSGIServer.get_listener(address, family=socket.AF_INET)
+        return sock
 
-    def start_gevent(self):
+    def _start_gevent(self):
         ssl_args = self.ssl_args or {}
         log.info('Starting Gevent server')
 
@@ -102,78 +127,58 @@ class server:
             sock = self._make_gevent_socket()
             self.wsgiserver = WSGIServer(sock, self.app, log=self.access_logger, spawn=Pool(), **ssl_args)
             self.wsgiserver.serve_forever()
-        except socket.error:
-            try:
-                log.info('Unable to listen on "", trying on "0.0.0.0" only...')
-                self.wsgiserver = WSGIServer(('0.0.0.0', config.config_port), self.app, spawn=Pool(), **ssl_args)
-                self.wsgiserver.serve_forever()
-            except (OSError, socket.error) as e:
-                log.info("Error starting server: %s", e.strerror)
-                print("Error starting server: %s" % e.strerror)
-                global_WorkerThread.stop()
-                sys.exit(1)
-        except Exception:
-            log.exception("Unknown error while starting gevent")
-            sys.exit(0)
+        finally:
+            if self.unix_socket_file:
+                os.remove(self.unix_socket_file)
+                self.unix_socket_file = None
 
-    def start_tornado(self):
-        log.info('Starting Tornado server on %s', self.listening)
+    def _start_tornado(self):
+        log.info('Starting Tornado server on %s', self.listen_address)
 
-        try:
         # Max Buffersize set to 200MB            )
         http_server = HTTPServer(WSGIContainer(self.app),
                     max_buffer_size = 209700000,
                     ssl_options=self.ssl_args)
-            address = config.get_config_ipaddress()
-            http_server.listen(self.port, address)
+        http_server.listen(self.listen_port, self.listen_address)
         self.wsgiserver=IOLoop.instance()
         self.wsgiserver.start()
         # wait for stop signal
         self.wsgiserver.close(True)
-        except socket.error as err:
-            log.exception("Error starting tornado server")
-            print("Error starting server: %s" % err.strerror)
-            global_WorkerThread.stop()
-            sys.exit(1)
 
-    def startServer(self):
-        if gevent_present:
+    def start(self):
+        try:
+            if _GEVENT:
                 # leave subprocess out to allow forking for fetchers and processors
-            self.start_gevent()
+                self._start_gevent()
             else:
-            self.start_tornado()
-
-        if self.restart is True:
-            log.info("Performing restart of Calibre-Web")
+                self._start_tornado()
+        except Exception as ex:
+            log.error("Error starting server: %s", ex)
+            print("Error starting server: %s" % ex)
+            return False
+        finally:
+            self.wsgiserver = None
             global_WorkerThread.stop()
-            if os.name == 'nt':
-                arguments = ["\"" + sys.executable + "\""]
-                for e in sys.argv:
-                    arguments.append("\"" + e + "\"")
-                os.execv(sys.executable, arguments)
-            else:
-                os.execl(sys.executable, sys.executable, *sys.argv)
-        else:
+
+        if not self.restart:
             log.info("Performing shutdown of Calibre-Web")
-            global_WorkerThread.stop()
-        sys.exit(0)
+            return True
 
-    def setRestartTyp(self,starttyp):
-        self.restart = starttyp
+        log.info("Performing restart of Calibre-Web")
+        arguments = list(sys.argv)
+        arguments.insert(0, sys.executable)
+        if os.name == 'nt':
+            arguments = ["\"%s\"" % a for a in arguments]
+        os.execv(sys.executable, arguments)
+        return True
 
-    def killServer(self, signum, frame):
-        self.stopServer()
+    def _killServer(self, signum, frame):
+        self.stop()
 
-    def stopServer(self):
+    def stop(self, restart=False):
+        self.restart = restart
         if self.wsgiserver:
-            if gevent_present:
+            if _GEVENT:
                 self.wsgiserver.close()
             else:
                 self.wsgiserver.add_callback(self.wsgiserver.stop)
-
-    @staticmethod
-    def getNameVersion():
-        if gevent_present:
-            return {'Gevent': 'v' + geventVersion}
-        else:
-            return {'Tornado': 'v' + tornadoVersion}

cps/ub.py

@@ -476,28 +476,20 @@ class Config:
     def get_config_certfile(self):
         if cli.certfilepath:
             return cli.certfilepath
-        else:
         if cli.certfilepath is "":
             return None
-            else:
         return self.config_certfile
 
     def get_config_keyfile(self):
         if cli.keyfilepath:
             return cli.keyfilepath
-        else:
         if cli.certfilepath is "":
             return None
-            else:
         return self.config_keyfile
 
     def get_config_ipaddress(self, readable=False):
         if not readable:
-            if cli.ipadress:
-                return cli.ipadress
-            else:
-                return ""
-        else:
+            return cli.ipadress or ""
         answer="0.0.0.0"
         if cli.ipadress:
             if cli.ipv6:

cps/updater.py

@@ -33,7 +33,7 @@ from tempfile import gettempdir
 from babel.dates import format_datetime
 from flask_babel import gettext as _
 
-from . import constants, logger, config, get_locale, Server
+from . import constants, logger, config, get_locale, web_server
 
 
 log = logger.create()
@@ -95,8 +95,7 @@ class Updater(threading.Thread):
             self.status = 6
             log.debug(u'Preparing restart of server')
             time.sleep(2)
-            Server.setRestartTyp(True)
-            Server.stopServer()
+            web_server.stop(True)
             self.status = 7
             time.sleep(2)
         except requests.exceptions.HTTPError as ex: