def delete(key=None):
# TODO(choudhury): shut down a vtkweb process by key after a given timeout.
processes = tangelo.plugin_store()["processes"]
if key is None:
tangelo.http_status(400, "Required Argument Missing")
return {"error": "'key' argument is required"}
# Check for the key in the process table.
if key not in processes:
tangelo.http_status(400, "Key Not Found")
return {"error": "Key %s not in process table" % (key)}
# Terminate the process.
tangelo.log_info("VTKWEB", "Shutting down process %s" % (key))
proc = processes[key]
proc["process"].terminate()
proc["process"].wait()
tangelo.log_success("VTKWEB", "Process terminated")
# Remove the process entry from the table.
del processes[key]
return {"key": key}
def delete(key=None):
# TODO(choudhury): shut down a vtkweb process by key after a given timeout.
processes = tangelo.plugin_store()["processes"]
if key is None:
tangelo.http_status(400, "Required Argument Missing")
return {"error": "'key' argument is required"}
# Check for the key in the process table.
if key not in processes:
tangelo.http_status(400, "Key Not Found")
return {"error": "Key %s not in process table" % (key)}
# Terminate the process.
tangelo.log_info("VTKWEB", "Shutting down process %s" % (key))
proc = processes[key]
proc["process"].terminate()
proc["process"].wait()
tangelo.log_success("VTKWEB", "Process terminated")
# Remove the process entry from the table.
del processes[key]
return {"key": key}
def __init__(self, base_package, config, plugin_dir):
self.base_package = base_package
self.plugin_dir = plugin_dir
self.errors = []
self.plugins = {}
self.modules = tangelo.util.ModuleCache(config=False)
# Create a virtual module to hold all plugin python modules.
exec("%s = sys.modules[self.base_package] = types.ModuleType(self.base_package)" % (self.base_package))
# A null config should be treated as an empty list.
if config is None:
config = []
# Read through the list of plugin configs, extracting the info and
# validating as we go.
for i, entry in enumerate(config):
if not isinstance(entry, dict):
self.errors.append("Configuration for plugin %d is not an associative array" % (i + 1))
return
name = entry.get("name")
if name is None:
self.errors.append("Configuration for plugin %d is missing required 'name' property" % (i + 1))
return
if name in self.plugins:
self.errors.append("Configuration for plugin %d uses duplicate plugin name '%s'" % (i + 1, name))
return
self.plugins[name] = entry
del self.plugins[name]["name"]
# Load all the plugins one by one, bailing out if there are any errors.
for plugin, conf in self.plugins.iteritems():
if "path" in conf:
# Extract the plugin path.
path = os.path.abspath(conf["path"])
else:
# Construct the plugin path, given the name of the plugin,
# and the base path of Tangelo.
path = os.path.join(self.plugin_dir, plugin)
if not self.load(plugin, path):
self.errors.append("Plugin %s failed to load" % (plugin))
return
tangelo.log_success("Plugin %s loaded" % (plugin))
def shutdown(signum, frame):
tangelo.log_info("TANGELO", "Received interrupt signal, performing graceful shutdown")
# Disbale the shutdown handler (i.e., for repeated Ctrl-C etc.) for the
# "polite" shutdown signals.
for sig in [signal.SIGINT, signal.SIGTERM]:
signal.signal(sig, polite)
# Perform plugin shutdown operations.
tangelo.log_info("TANGELO", "Shutting down plugins...")
plugins = cherrypy.config.get("plugins")
if plugins:
plugins.unload_all()
# Perform CherryPy shutdown and exit.
tangelo.log_info("TANGELO", "Stopping web server")
cherrypy.engine.stop()
cherrypy.engine.exit()
tangelo.log_success("TANGELO", "Be seeing you.")
def shutdown(signum, frame):
tangelo.log_info(
"TANGELO", "Received interrupt signal, performing graceful shutdown")
# Disbale the shutdown handler (i.e., for repeated Ctrl-C etc.) for the
# "polite" shutdown signals.
for sig in [signal.SIGINT, signal.SIGTERM]:
signal.signal(sig, polite)
# Perform plugin shutdown operations.
tangelo.log_info("TANGELO", "Shutting down plugins...")
plugins = cherrypy.config.get("plugins")
if plugins:
plugins.unload_all()
# Perform CherryPy shutdown and exit.
tangelo.log_info("TANGELO", "Stopping web server")
cherrypy.engine.stop()
cherrypy.engine.exit()
tangelo.log_success("TANGELO", "Be seeing you.")
def unload(self, plugin_name):
tangelo.log_info("PLUGIN", "Unloading plugin '%s'" % (plugin_name))
plugin = self.plugins[plugin_name]
if plugin.module is not None:
tangelo.log_info("PLUGIN", "\t...removing module %s" % (plugin.module))
del sys.modules[plugin.module]
exec("del %s" % (plugin.module))
for app_path in plugin.apps:
tangelo.log_info("PLUGIN", "\t...unmounting app at %s" % (app_path))
del cherrypy.tree.apps[app_path]
if "teardown" in dir(plugin.control):
tangelo.log_info("PLUGIN", "\t...running teardown")
try:
plugin.control.teardown(cherrypy.config["plugin-config"][plugin.path], cherrypy.config["plugin-store"][plugin.path])
except:
tangelo.log_warning("PLUGIN", "Could not run teardown:\n%s", (traceback.format_exc()))
del self.plugins[plugin_name]
tangelo.log_success("plugin %s unloaded" % (plugin_name))
def main():
p = argparse.ArgumentParser(description="Start a Tangelo server.")
p.add_argument("-c",
"--config",
type=str,
default=None,
metavar="FILE",
help="specifies configuration file to use")
p.add_argument(
"-a",
"--access-auth",
action="store_const",
const=True,
default=None,
help=
"enable HTTP authentication (i.e. processing of .htaccess files) (default)"
)
p.add_argument(
"-na",
"--no-access-auth",
action="store_const",
const=True,
default=None,
help="disable HTTP authentication (i.e. processing of .htaccess files)"
)
p.add_argument(
"-p",
"--drop-privileges",
action="store_const",
const=True,
default=None,
help="enable privilege drop when started as superuser (default)")
p.add_argument("-np",
"--no-drop-privileges",
action="store_const",
const=True,
default=None,
help="disable privilege drop when started as superuser")
p.add_argument("-s",
"--sessions",
action="store_const",
const=True,
default=None,
help="enable session tracking (default)")
p.add_argument("-ns",
"--no-sessions",
action="store_const",
const=True,
default=None,
help="disable session tracking")
p.add_argument("--list-dir",
action="store_true",
default=None,
help="enable directory content serving")
p.add_argument("--no-list-dir",
action="store_true",
default=None,
help="disable directory content serving (default)")
p.add_argument("--show-py",
action="store_true",
default=None,
help="enable Python service source code serving")
p.add_argument("--no-show-py",
action="store_true",
default=None,
help="disable Python service source code serving (default)")
p.add_argument(
"--hostname",
type=str,
default=None,
metavar="HOSTNAME",
help="overrides configured hostname on which to run Tangelo")
p.add_argument(
"--port",
type=int,
default=None,
metavar="PORT",
help="overrides configured port number on which to run Tangelo")
p.add_argument(
"-u",
"--user",
type=str,
default=None,
metavar="USERNAME",
help="specifies the user to run as when root privileges are dropped")
p.add_argument(
"-g",
"--group",
type=str,
default=None,
metavar="GROUPNAME",
help="specifies the group to run as when root privileges are dropped")
p.add_argument("-r",
"--root",
type=str,
default=None,
metavar="DIR",
help="the directory from which Tangelo will serve content")
p.add_argument("--verbose",
"-v",
action="store_true",
help="display extra information as Tangelo starts up")
p.add_argument("--version",
action="store_true",
help="display Tangelo version number")
p.add_argument(
"--key",
type=str,
default=None,
metavar="FILE",
help=
"the path to the SSL key. You must also specify --cert to serve content over https."
)
p.add_argument(
"--cert",
type=str,
default=None,
metavar="FILE",
help=
"the path to the SSL certificate. You must also specify --key to serve content over https."
)
p.add_argument("--examples",
action="store_true",
default=None,
help="Serve the Tangelo example applications")
args = p.parse_args()
# If version flag is present, print the version number and exit.
if args.version:
print tangelo_version
return 0
# Make sure user didn't specify conflicting flags.
if args.access_auth and args.no_access_auth:
tangelo.log_error(
"ERROR",
"can't specify both --access-auth (-a) and --no-access-auth (-na) together"
)
return 1
if args.drop_privileges and args.no_drop_privileges:
tangelo.log_error(
"ERROR",
"can't specify both --drop-privileges (-p) and --no-drop-privileges (-np) together"
)
return 1
if args.no_sessions and args.sessions:
tangelo.log_error(
"ERROR",
"can't specify both --sessions (-s) and --no-sessions (-ns) together"
)
return 1
if args.examples and args.root:
tangelo.log_error(
"ERROR", "can't specify both --examples and --root (-r) together")
return 1
if args.examples and args.config:
tangelo.log_error(
"ERROR",
"can't specify both --examples and --config (-c) together")
return 1
if args.no_list_dir and args.list_dir:
tangelo.log_error(
"ERROR",
"can't specify both --list-dir and --no-list-dir together")
sys.exit(1)
if args.no_show_py and args.show_py:
tangelo.log_error(
"ERROR", "can't specify both --show-py and --no-show-py together")
sys.exit(1)
# Decide if we have a configuration file or not.
cfg_file = args.config
if cfg_file is None:
tangelo.log(
"TANGELO",
"No configuration file specified - using command line args and defaults"
)
else:
cfg_file = tangelo.util.expandpath(cfg_file)
tangelo.log("TANGELO", "Using configuration file %s" % (cfg_file))
# Parse the config file; report errors if any.
try:
config = Config(cfg_file)
except (IOError, ValueError) as e:
tangelo.log_error("ERROR", e)
return 1
# Type check the config entries.
if not config.type_check():
for message in config.errors:
tangelo.log_error("TANGELO", message)
return 1
# Determine whether to use access auth.
access_auth = True
if args.access_auth is None and args.no_access_auth is None:
if config.access_auth is not None:
access_auth = config.access_auth
else:
access_auth = (args.access_auth
is not None) or (not args.no_access_auth)
tangelo.log(
"TANGELO", "Access authentication %s" %
("enabled" if access_auth else "disabled"))
# Determine whether to perform privilege drop.
drop_privileges = True
if args.drop_privileges is None and args.no_drop_privileges is None:
if config.drop_privileges is not None:
drop_privileges = config.drop_privileges
else:
drop_privileges = (args.drop_privileges
is not None) or (not args.no_drop_privileges)
# Determine whether to enable sessions.
sessions = True
if args.sessions is None and args.no_sessions is None:
if config.sessions is not None:
sessions = config.sessions
else:
sessions = (args.sessions is not None) or (not args.no_sessions)
tangelo.log("TANGELO",
"Sessions %s" % ("enabled" if sessions else "disabled"))
# Determine whether to serve directory listings by default.
listdir = False
if args.list_dir is None and args.no_list_dir is None:
if config.list_dir is not None:
listdir = config.list_dir
else:
listdir = (args.list_dir is not None) or (not args.no_list_dir)
cherrypy.config["listdir"] = listdir
tangelo.log(
"TANGELO", "Directory content serving %s" %
("enabled" if listdir else "disabled"))
# Determine whether to serve web service Python source code by default.
showpy = False
if args.show_py is None and args.no_show_py is None:
if config.show_py is not None:
showpy = config.show_py
else:
showpy = (args.show_py is not None) or (not args.no_show_py)
cherrypy.config["showpy"] = showpy
tangelo.log(
"TANGELO", "Web service source code serving %s" %
("enabled" if showpy else "disabled"))
# Extract the rest of the arguments, giving priority first to command line
# arguments, then to the configuration file (if any), and finally to a
# hard-coded default value.
hostname = args.hostname or config.hostname or "localhost"
port = args.port or config.port or 8080
user = args.user or config.user or "nobody"
group = args.group or config.group or "nobody"
tangelo.log("TANGELO", "Hostname: %s" % (hostname))
tangelo.log("TANGELO", "Port: %d" % (port))
tangelo.log(
"TANGELO", "Privilege drop %s" %
("enabled (if necessary)" if drop_privileges else "disabled"))
if drop_privileges:
tangelo.log("TANGELO", "\tUser: %s" % (user))
tangelo.log("TANGELO", "\tGroup: %s" % (group))
# HTTPS support
#
# Grab the ssl key file.
ssl_key = args.key or config.key
if ssl_key is not None:
ssl_key = tangelo.util.expandpath(ssl_key)
# Grab the cert file.
ssl_cert = args.cert or config.cert
if ssl_cert is not None:
ssl_cert = tangelo.util.expandpath(ssl_cert)
# In order to enable HTTPS, *both* the key and cert must be specified. If
# only one or the other is specified, this is considered an error, because
# we don't want to serve what the user is considering sensitive content over
# HTTP by default.
if ssl_key is not None and ssl_cert is not None:
cherrypy.config.update({
"server.ssl_module": "pyopenssl",
"server.ssl_certificate": ssl_cert,
"server.ssl_private_key": ssl_key
})
tangelo.log("TANGELO", "HTTPS enabled")
tangelo.log("TANGELO", "\tSSL Cert file: %s" % (ssl_cert))
tangelo.log("TANGELO", "\tSSL Key file: %s" % (ssl_key))
elif not (ssl_key is None and ssl_cert is None):
tangelo.log_error("TANGELO", "error: SSL key or SSL cert missing")
return 1
else:
tangelo.log("TANGELO", "HTTPS disabled")
# We need a web root - use the installed example web directory as a
# fallback. This might be found in a few different places, so try them one
# by one until we find one that exists.
root = args.root or config.root
if root:
root = tangelo.util.expandpath(root)
elif args.examples:
# Set the examples web root.
root = get_web_directory()
tangelo.log_info("TANGELO",
"Looking for example web content path in %s" % (root))
if not os.path.exists(root):
tangelo.log_error("ERROR", "could not find examples package")
return 1
# Set the examples plugins.
config.plugins = [{
"name": "config"
}, {
"name": "data"
}, {
"name": "docs"
}, {
"name": "mapping"
}, {
"name": "mongo"
}, {
"name": "stream"
}, {
"name": "tangelo"
}, {
"name": "ui"
}, {
"name": "vis"
}]
else:
root = tangelo.util.expandpath(".")
tangelo.log("TANGELO", "Serving content from %s" % (root))
# Set the web root directory.
cherrypy.config.update({"webroot": root})
# Place an empty dict to hold per-module configuration into the global
# configuration object, and one for persistent per-module storage (the
# latter can be manipulated by the service).
cherrypy.config.update({"module-config": {}})
cherrypy.config.update({"module-store": {}})
# Analogs of the module storage dicts, but for plugins.
cherrypy.config.update({"plugin-config": {}})
cherrypy.config.update({"plugin-store": {}})
# Create a plugin manager.
plugins = tangelo.server.Plugins("tangelo.plugin",
config=config.plugins,
plugin_dir=get_bundled_plugin_directory())
# Check for any errors - if there are, report them and exit.
if not plugins.good():
for message in plugins.errors:
tangelo.log_error("PLUGIN", message)
return 1
# Save the plugin manager for use later (when unloading plugins during
# shutdown).
cherrypy.config.update({"plugins": plugins})
# Create an instance of the main handler object.
module_cache = tangelo.util.ModuleCache()
tangelo_server = tangelo.server.Tangelo(module_cache=module_cache,
plugins=plugins)
rootapp = cherrypy.Application(tangelo_server, "/")
# Place an AuthUpdate handler in the Tangelo object if access authorization
# is on.
tangelo_server.auth_update = tangelo.server.AuthUpdate(app=rootapp)
# Mount the root application object.
cherrypy.tree.mount(rootapp,
config={
"/": {
"tools.sessions.on": sessions
},
"/favicon.ico": {
"tools.staticfile.on": True,
"tools.staticfile.filename": get_tangelo_ico()
}
})
# Set up the global configuration.
cherrypy.config.update({
"environment": "production",
"log.screen": True,
"server.socket_host": hostname,
"server.socket_port": port
})
# Try to drop privileges if requested, since we've bound to whatever port
# superuser privileges were needed for already.
if drop_privileges:
# If we're on windows, don't supply any username/groupname, and just
# assume we should drop priveleges.
if platform.system() == "Windows":
tangelo.log("TANGELO", "Performing privilege drop")
cherrypy.process.plugins.DropPrivileges(
cherrypy.engine).subscribe()
elif os.getuid() == 0:
tangelo.log("TANGELO", "Performing privilege drop")
# Reaching here means we're on unix, and we are the root user, so go
# ahead and drop privileges to the requested user/group.
import grp
import pwd
# On some systems, negative uids and gids are allowed. These can
# render in Python (in particular, on OS X) as very large unsigned
# values. This function first checks to see if the input value is
# already negative; if so, there's no issue and we return it
# unchanged. Otherwise, we treat the argument as a bit
# representation of a *signed* value, check the sign bit to see if
# it *should* be a negative number, and then perform the proper
# arithmetic to turn it into a signed one.
def to_signed(val):
# If we already see a negative number, just return it.
if val < 0:
return val
# Check sign bit, and subtract the unsigned range from the value
# if it is set.
return val - 0x100000000 if val & 0x80000000 else val
# Find the UID and GID for the requested user and group.
try:
mode = "user"
value = user
uid = to_signed(pwd.getpwnam(user).pw_uid)
mode = "group"
value = group
gid = to_signed(grp.getgrnam(group).gr_gid)
except KeyError:
tangelo.log_error(
"TANGELO",
"no such %s '%s' to drop privileges to" % (mode, value))
return 1
# Set the process home directory to be the dropped-down user's.
os.environ["HOME"] = os.path.expanduser("~%s" % (user))
# Perform the actual UID/GID change.
cherrypy.process.plugins.DropPrivileges(cherrypy.engine,
uid=uid,
gid=gid).subscribe()
else:
tangelo.log(
"TANGELO",
"Not performing privilege drop (because not running as superuser)"
)
# Set up websocket handling. Use the pass-through subclassed version of the
# plugin so we can set a priority on it that doesn't conflict with privilege
# drop.
tangelo.websocket.WebSocketLowPriorityPlugin(cherrypy.engine).subscribe()
cherrypy.tools.websocket = ws4py.server.cherrypyserver.WebSocketTool()
# Replace the stock auth_digest and auth_basic tools with ones that have
# slightly lower priority (so the AuthUpdate tool can run before them).
cherrypy.tools.auth_basic = cherrypy.Tool(
"before_handler", cherrypy.lib.auth_basic.basic_auth, priority=2)
cherrypy.tools.auth_digest = cherrypy.Tool(
"before_handler", cherrypy.lib.auth_digest.digest_auth, priority=2)
# Install signal handlers to allow for proper cleanup/shutdown.
for sig in [signal.SIGINT, signal.SIGTERM]:
signal.signal(sig, shutdown)
# Send SIGQUIT to an immediate, ungraceful shutdown instead.
if platform.system() != "Windows":
signal.signal(signal.SIGQUIT, die)
# Start the CherryPy engine.
cherrypy.engine.start()
tangelo.log_success("TANGELO", "Server is running")
cherrypy.engine.block()
def main():
p = argparse.ArgumentParser(description="Start a Tangelo server.")
p.add_argument("-c", "--config", type=str, default=None, metavar="FILE", help="specifies configuration file to use")
p.add_argument("-a", "--access-auth", action="store_const", const=True, default=None, help="enable HTTP authentication (i.e. processing of .htaccess files) (default)")
p.add_argument("-na", "--no-access-auth", action="store_const", const=True, default=None, help="disable HTTP authentication (i.e. processing of .htaccess files)")
p.add_argument("-p", "--drop-privileges", action="store_const", const=True, default=None, help="enable privilege drop when started as superuser (default)")
p.add_argument("-np", "--no-drop-privileges", action="store_const", const=True, default=None, help="disable privilege drop when started as superuser")
p.add_argument("-s", "--sessions", action="store_const", const=True, default=None, help="enable session tracking (default)")
p.add_argument("-ns", "--no-sessions", action="store_const", const=True, default=None, help="edisable session tracking")
p.add_argument("--hostname", type=str, default=None, metavar="HOSTNAME", help="overrides configured hostname on which to run Tangelo")
p.add_argument("--port", type=int, default=None, metavar="PORT", help="overrides configured port number on which to run Tangelo")
p.add_argument("-u", "--user", type=str, default=None, metavar="USERNAME", help="specifies the user to run as when root privileges are dropped")
p.add_argument("-g", "--group", type=str, default=None, metavar="GROUPNAME", help="specifies the group to run as when root privileges are dropped")
p.add_argument("-r", "--root", type=str, default=None, metavar="DIR", help="the directory from which Tangelo will serve content")
p.add_argument("--verbose", "-v", action="store_true", help="display extra information as Tangelo starts up")
p.add_argument("--version", action="store_true", help="display Tangelo version number")
p.add_argument("--key", type=str, default=None, metavar="FILE", help="the path to the SSL key. You must also specify --cert to serve content over https.")
p.add_argument("--cert", type=str, default=None, metavar="FILE", help="the path to the SSL certificate. You must also specify --key to serve content over https.")
p.add_argument("--plugin-config", type=str, default=None, metavar="PATH", help="path to plugin configuration file")
args = p.parse_args()
# If version flag is present, print the version number and exit.
if args.version:
print tangelo_version
return 0
# Make sure user didn't specify conflicting flags.
if args.access_auth and args.no_access_auth:
tangelo.log_error("ERROR", "can't specify both --access-auth (-a) and --no-access-auth (-na) together")
return 1
if args.drop_privileges and args.no_drop_privileges:
tangelo.log_error("ERROR", "can't specify both --drop-privileges (-p) and --no-drop-privileges (-np) together")
return 1
if args.no_sessions and args.sessions:
tangelo.log_error("ERROR", "can't specify both --sessions (-s) and --no-sessions (-ns) together")
sys.exit(1)
# Figure out where this is being called from - that will be useful for a
# couple of purposes.
invocation_dir = os.path.abspath(os.path.dirname(os.path.abspath(__file__)) + "/..")
# Before extracting the other arguments, compute a configuration dictionary.
# If --no-config was specified, this will be the empty dictionary;
# otherwise, check the command line arguments for a config file first, then
# look for one in a sequence of other places.
config = {}
cfg_file = args.config
if cfg_file is None:
tangelo.log("TANGELO", "No configuration file specified - using command line args and defaults")
else:
cfg_file = tangelo.util.expandpath(cfg_file)
tangelo.log("TANGELO", "Using configuration file %s" % (cfg_file))
# Get a dict representing the contents of the config file.
try:
ok = False
config = Config(cfg_file)
ok = True
except (IOError, TypeError) as e:
tangelo.log_error("TANGELO", "error: %s" % (e))
except yaml.YAMLError as e:
tangelo.log_error("TANGELO", "error while parsing config file: %s" % (e))
finally:
if not ok:
return 1
# Determine whether to use access auth.
access_auth = True
if args.access_auth is None and args.no_access_auth is None:
if config.access_auth is not None:
access_auth = config.access_auth
else:
access_auth = (args.access_auth is not None) or (not args.no_access_auth)
tangelo.log("TANGELO", "Access authentication %s" % ("enabled" if access_auth else "disabled"))
# Determine whether to perform privilege drop.
drop_privileges = True
if args.drop_privileges is None and args.no_drop_privileges is None:
if config.drop_privileges is not None:
drop_privileges = config.drop_privileges
else:
drop_privileges = (args.drop_privileges is not None) or (not args.no_drop_privileges)
# Determine whether to enable sessions.
sessions = True
if args.sessions is None and args.no_sessions is None:
if config.sessions is not None:
sessions = config.sessions
else:
sessions = (args.sessions is not None) or (not args.no_sessions)
tangelo.log("TANGELO", "Sessions %s" % ("enabled" if sessions else "disabled"))
# Extract the rest of the arguments, giving priority first to command line
# arguments, then to the configuration file (if any), and finally to a
# hard-coded default value.
hostname = args.hostname or config.hostname or "localhost"
port = args.port or config.port or 8080
user = args.user or config.user or "nobody"
group = args.group or config.group or "nobody"
tangelo.log("TANGELO", "Hostname: %s" % (hostname))
tangelo.log("TANGELO", "Port: %d" % (port))
tangelo.log("TANGELO", "Privilege drop %s" % ("enabled (if necessary)" if drop_privileges else "disabled"))
if drop_privileges:
tangelo.log("TANGELO", "\tUser: %s" % (user))
tangelo.log("TANGELO", "\tGroup: %s" % (group))
# HTTPS support
#
# Grab the ssl key file.
ssl_key = args.key or config.key
if ssl_key is not None:
ssl_key = tangelo.util.expandpath(ssl_key)
# Grab the cert file.
ssl_cert = args.cert or config.cert
if ssl_cert is not None:
ssl_cert = tangelo.util.expandpath(ssl_cert)
# In order to enable HTTPS, *both* the key and cert must be specified. If
# only one or the other is specified, this is considered an error, because
# we don't want to serve what the user is considering sensitive content over
# HTTP by default.
if ssl_key is not None and ssl_cert is not None:
cherrypy.config.update({"server.ssl_module": "pyopenssl",
"server.ssl_certificate": ssl_cert,
"server.ssl_private_key": ssl_key})
tangelo.log("TANGELO", "HTTPS enabled")
tangelo.log("TANGELO", "\tSSL Cert file: %s" % (ssl_cert))
tangelo.log("TANGELO", "\tSSL Key file: %s" % (ssl_key))
elif not (ssl_key is None and ssl_cert is None):
tangelo.log_error("TANGELO", "error: SSL key or SSL cert missing")
return 1
else:
tangelo.log("TANGELO", "HTTPS disabled")
# We need a web root - use the installed example web directory as a
# fallback. This might be found in a few different places, so try them one
# by one until we find one that exists.
#
# TODO(choudhury): shouldn't we *only* check the invocation_dir option? We
# shouldn't pick up a stray web directory that happens to be found in /usr
# if we're invoking tangelo from a totally different location.
root = args.root or config.root
if root:
root = tangelo.util.expandpath(root)
else:
default_paths = map(tangelo.util.expandpath, [sys.prefix + "/share/tangelo/web",
invocation_dir + "/share/tangelo/web",
"/usr/local/share/tangelo/web"])
tangelo.log_info("TANGELO", "Looking for default web content path")
for path in default_paths:
tangelo.log_info("TANGELO", "Trying %s" % (path))
if os.path.exists(path):
root = path
break
# TODO(choudhury): by default, should we simply serve from the current
# directory? This is how SimpleHTTPServer works, for example.
if not root:
tangelo.log_error("TANGELO", "could not find default web root directory")
return 1
tangelo.log("TANGELO", "Serving content from %s" % (root))
# Compute a default plugin configuration if it was not supplied.
if args.plugin_config is None:
plugin_cfg_file = None
default_paths = map(tangelo.util.expandpath, [sys.prefix + "/share/tangelo/plugin/plugin.conf",
invocation_dir + "/share/tangelo/plugin/plugin.conf",
"/usr/local/share/tangelo/plugin/plugin.conf"])
tangelo.log_info("TANGELO", "Looking for default plugin configuration file")
for path in default_paths:
tangelo.log_info("TANGELO", "Trying %s" % (path))
if os.path.exists(path):
plugin_cfg_file = path
break
else:
plugin_cfg_file = tangelo.util.expandpath(args.plugin_config)
# Warn if plugin file doesn't exist.
if plugin_cfg_file is None:
tangelo.log_warning("TANGELO", "Could not find a default plugin configuration file")
elif not os.path.exists(plugin_cfg_file):
tangelo.log_warning("TANGELO", "Plugin configuration file %s does not exist - create it to load plugins at runtime" % (plugin_cfg_file))
else:
tangelo.log("TANGELO", "Using plugin configuration file '%s'" % (plugin_cfg_file))
# Set the web root directory.
cherrypy.config.update({"webroot": root})
# Place an empty dict to hold per-module configuration into the global
# configuration object, and one for persistent per-module storage (the
# latter can be manipulated by the service).
cherrypy.config.update({"module-config": {}})
cherrypy.config.update({"module-store": {}})
# Analogs of the module storage dicts, but for plugins.
cherrypy.config.update({"plugin-config": {}})
cherrypy.config.update({"plugin-store": {}})
# Create a plugin manager. It is marked global so that the plugins can be
# unloaded when Tangelo exits.
plugins = tangelo.server.Plugins("tangelo.plugin", plugin_cfg_file)
cherrypy.config.update({"plugins": plugins})
# Create an instance of the main handler object.
module_cache = tangelo.util.ModuleCache()
tangelo_server = tangelo.server.Tangelo(module_cache=module_cache, plugins=plugins)
rootapp = cherrypy.Application(tangelo_server, "/")
# Place an AuthUpdate handler in the Tangelo object if access authorization
# is on.
tangelo_server.auth_update = tangelo.server.AuthUpdate(app=rootapp)
# Mount the root application object.
cherrypy.tree.mount(rootapp, config={"/": {"tools.sessions.on": sessions},
"/favicon.ico": {"tools.staticfile.on": True,
"tools.staticfile.filename": sys.prefix + "/share/tangelo/tangelo.ico"}})
# Set up the global configuration.
try:
cherrypy.config.update({"environment": "production",
"log.screen": True,
"server.socket_host": hostname,
"server.socket_port": port})
except IOError as e:
tangelo.log_error("TANGELO", "problem with config file %s: %s" % (e.filename, e.strerror))
return 1
# Try to drop privileges if requested, since we've bound to whatever port
# superuser privileges were needed for already.
if drop_privileges:
# If we're on windows, don't supply any username/groupname, and just
# assume we should drop priveleges.
if platform.system() == "Windows":
tangelo.log("TANGELO", "Performing privilege drop")
cherrypy.process.plugins.DropPrivileges(cherrypy.engine).subscribe()
elif os.getuid() == 0:
tangelo.log("TANGELO", "Performing privilege drop")
# Reaching here means we're on unix, and we are the root user, so go
# ahead and drop privileges to the requested user/group.
import grp
import pwd
# On some systems, negative uids and gids are allowed. These can
# render in Python (in particular, on OS X) as very large unsigned
# values. This function first checks to see if the input value is
# already negative; if so, there's no issue and we return it
# unchanged. Otherwise, we treat the argument as a bit
# representation of a *signed* value, check the sign bit to see if
# it *should* be a negative number, and then perform the proper
# arithmetic to turn it into a signed one.
def to_signed(val):
# If we already see a negative number, just return it.
if val < 0:
return val
# Check sign bit, and subtract the unsigned range from the value
# if it is set.
return val - 0x100000000 if val & 0x80000000 else val
# Find the UID and GID for the requested user and group.
try:
mode = "user"
value = user
uid = to_signed(pwd.getpwnam(user).pw_uid)
mode = "group"
value = group
gid = to_signed(grp.getgrnam(group).gr_gid)
except KeyError:
tangelo.log_error("TANGELO", "no such %s '%s' to drop privileges to" % (mode, value))
return 1
# Set the process home directory to be the dropped-down user's.
os.environ["HOME"] = os.path.expanduser("~%s" % (user))
# Perform the actual UID/GID change.
cherrypy.process.plugins.DropPrivileges(cherrypy.engine, uid=uid, gid=gid).subscribe()
else:
tangelo.log("TANGELO", "Not performing privilege drop (because not running as superuser)")
# Set up websocket handling. Use the pass-through subclassed version of the
# plugin so we can set a priority on it that doesn't conflict with privilege
# drop.
tangelo.websocket.WebSocketLowPriorityPlugin(cherrypy.engine).subscribe()
cherrypy.tools.websocket = ws4py.server.cherrypyserver.WebSocketTool()
# Replace the stock auth_digest and auth_basic tools with ones that have
# slightly lower priority (so the AuthUpdate tool can run before them).
cherrypy.tools.auth_basic = cherrypy.Tool("before_handler", cherrypy.lib.auth_basic.basic_auth, priority=2)
cherrypy.tools.auth_digest = cherrypy.Tool("before_handler", cherrypy.lib.auth_digest.digest_auth, priority=2)
# Install signal handlers to allow for proper cleanup/shutdown.
for sig in [signal.SIGINT, signal.SIGTERM]:
signal.signal(sig, shutdown)
# Send SIGQUIT to an immediate, ungraceful shutdown instead.
if platform.system() != "Windows":
signal.signal(signal.SIGQUIT, die)
# Start the CherryPy engine.
cherrypy.engine.start()
tangelo.log_success("TANGELO", "Server is running")
cherrypy.engine.block()
