dev.mini.Core.cli_reload() - Code Metrics - isomeric/isomer - Measure and Improve Code Quality continuously with Scrutinizer

dev.mini.Core.cli_reload() A
last analyzed 2021-02-24 12:38 UTC

↳ Parent: dev.mini
Complexity

Conditions
Size

Total Lines	12
Code Lines	7
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
cc	1
eloc	7
nop	2
dl	0
loc	12
rs	10
c	0
b	0
f	0
#!/usr/bin/env python
# -*- coding: UTF-8 -*-

# Isomer - The distributed application framework
# ==============================================
# Copyright (C) 2011-2019 Heiko 'riot' Weinen <[email protected]> and others.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
Isomer - Backend

Application
===========

See README.rst for Build/Installation and setup details.

URLs & Contact
==============

Mail: [email protected]
IRC: #[email protected]

Project repository: http://github.com/isomeric/isomer
Frontend repository: http://github.com/isomeric/isomer-frontend


"""

import grp
import pwd
import sys
import pyinotify

import click
import os
from circuits import Event
from circuits.web import Server, Static
from circuits.web.websockets.dispatcher import WebSocketsDispatcher

# from circuits.web.errors import redirect
# from circuits.app.daemon import Daemon

from isomer.misc.path import set_instance, get_path
from isomer.component import handler, ConfigurableComponent

# from isomer.schemata.component import ComponentBaseConfigSchema
from isomer.database import initialize  # , schemastore
from isomer.events.system import populate_user_events, frontendbuildrequest
from isomer.logger import (
    isolog,
    verbose,
    debug,
    warn,
    error,
    critical,
    setup_root,
    verbosity,
    set_logfile,
)
from isomer.debugger import cli_register_event
from isomer.ui.builder import install_frontend
from isomer.error import abort, EXIT_NO_CERTIFICATE
from isomer.tool.etc import load_instance


# from pprint import pprint


class ready(Event):
    """Event fired to signal completeness of the local node's setup"""

    pass


class cli_components(Event):
    """List registered and running components"""

    pass


class cli_reload_db(Event):
    """Reload database and schemata (Dangerous!) WiP - does nothing right now"""

    pass


class cli_reload(Event):
    """Reload all components and data models"""

    pass


class cli_info(Event):
    """Provide information about the running instance"""

    pass


class cli_quit(Event):
    """Stop this instance

    Uses sys.exit() to quit.
    """

    pass


class cli_drop_privileges(Event):
    """Try to drop possible root privileges"""

    pass


class FrontendHandler(pyinotify.ProcessEvent):
    def __init__(self, launcher, *args, **kwargs):
        super(FrontendHandler, self).__init__(*args, **kwargs)
        self.launcher = launcher

    def process_IN_CLOSE_WRITE(self, event):
        print("CHANGE EVENT:", event)
        install_frontend(self.launcher.instance, install=False, development=True)


def drop_privileges(uid_name="isomer", gid_name="isomer"):

    """Attempt to drop privileges and change user to 'isomer' user/group"""

    if os.getuid() != 0:
        isolog("Not root, cannot drop privileges", lvl=warn, emitter="CORE")
        return

    try:
        # Get the uid/gid from the name
        running_uid = pwd.getpwnam(uid_name).pw_uid
        running_gid = grp.getgrnam(gid_name).gr_gid

        # Remove group privileges
        os.setgroups([])

        # Try setting the new uid/gid
        os.setgid(running_gid)
        os.setuid(running_uid)

        # Ensure a very conservative umask
        # old_umask = os.umask(22)
        isolog("Privileges dropped", emitter="CORE")
    except Exception as e:
        isolog(
            "Could not drop privileges:",
            e,
            type(e),
            exc=True,
            lvl=error,
            emitter="CORE",
        )


class Core(ConfigurableComponent):
    """Isomer Core Backend Application"""

    # TODO: Move most of this stuff over to a new FrontendBuilder

    configprops = {
        "enabled": {
            "type": "array",
            "title": "Available modules",
            "description": "Modules found and activatable by the system.",
            "default": [],
            "items": {"type": "string"},
        },
        "components": {
            "type": "object",
            "title": "Components",
            "description": "Component metadata",
            "default": {},
        },
        "frontendenabled": {
            "type": "boolean",
            "title": "Frontend enabled",
            "description": "Option to toggle frontend activation",
            "default": True,
        },
    }

    def __init__(self, name, instance, **kwargs):
        super(Core, self).__init__("CORE", **kwargs)
        self.log("Starting system (channel ", self.channel, ")")

        self.insecure = kwargs["insecure"]
        self.development = kwargs["dev"]

        self.instance = name

        host = kwargs.get("web_address", None)
        port = kwargs.get("web_port", None)

        # self.log(instance, pretty=True, lvl=verbose)

        self.host = instance["web_address"] if host is None else host
        self.port = instance["web_port"] if port is None else port

        self.log("Web configuration: %s:%i" % (self.host, int(self.port)), lvl=debug)

        self.certificate = certificate = (
            instance["web_certificate"] if instance["web_certificate"] != "" else None
        )

        if certificate:
            if not os.path.exists(certificate):
                self.log(
                    "SSL certificate usage requested but certificate "
                    "cannot be found!",
                    lvl=error,
                )
                abort(EXIT_NO_CERTIFICATE)

        # TODO: Find a way to synchronize this with the paths in i.u.builder
        if self.development:

            self.frontend_root = os.path.abspath(
                os.path.dirname(os.path.realpath(__file__)) + "/../frontend"
            )
            self.frontend_target = get_path("lib", "frontend-dev")
            self.module_root = os.path.abspath(
                os.path.dirname(os.path.realpath(__file__)) + "/../modules"
            )
        else:
            self.frontend_root = get_path("lib", "repository/frontend")
            self.frontend_target = get_path("lib", "frontend")
            self.module_root = ""

        self.log(
            "Frontend & module paths:",
            self.frontend_root,
            self.frontend_target,
            self.module_root,
            lvl=verbose,
        )

        self.loadable_components = {}
        self.running_components = {}

        self.frontend_running = False
        self.frontend_watcher = None
        self.frontend_watch_manager = None

        self.static = None
        self.websocket = None

        # TODO: Cleanup
        self.component_blacklist = [
            # 'camera',
            # 'logger',
            # 'debugger',
            "recorder",
            "playback",
            # 'sensors',
            # 'navdatasim'
            # 'ldap',
            # 'navdata',
            # 'nmeaparser',
            # 'objectmanager',
            # 'wiki',
            # 'clientmanager',
            # 'library',
            # 'nmeaplayback',
            # 'alert',
            # 'tilecache',
            # 'schemamanager',
            # 'chat',
            # 'debugger',
            # 'rcmanager',
            # 'auth',
            # 'machineroom'
        ]

        self.component_blacklist += kwargs["blacklist"]

        self.update_components()
        self._write_config()

        self.server = None

        if self.insecure:
            self.log("Not dropping privileges - this may be insecure!", lvl=warn)

    @handler("started", channel="*")
    def ready(self, source):
        """All components have initialized, set up the component
        configuration schema-store, run the local server and drop privileges"""

        from isomer.schemastore import configschemastore

        configschemastore[self.name] = self.configschema

        self._start_server()

        if not self.insecure:
            self._drop_privileges()

        self.fireEvent(cli_register_event("components", cli_components))
        self.fireEvent(cli_register_event("drop_privileges", cli_drop_privileges))
        self.fireEvent(cli_register_event("reload_db", cli_reload_db))
        self.fireEvent(cli_register_event("reload", cli_reload))
        self.fireEvent(cli_register_event("quit", cli_quit))
        self.fireEvent(cli_register_event("info", cli_info))

    @handler("frontendbuildrequest", channel="setup")
    def trigger_frontend_build(self, event):
        """Event hook to trigger a new frontend build"""

        from isomer.database import instance

        install_frontend(
            instance=instance,
            forcerebuild=event.force,
            install=event.install,
            development=self.development,
        )

    @handler("cli_drop_privileges")
    def cli_drop_privileges(self, event):
        """Drop possible user privileges"""

        self.log("Trying to drop privileges", lvl=debug)
        self._drop_privileges()

    @handler("cli_components")
    def cli_components(self, event):
        """List all running components"""

        self.log("Running components: ", sorted(self.running_components.keys()))

    @handler("cli_reload_db")
    def cli_reload_db(self, event):
        """Experimental call to reload the database"""

        self.log("This command is WiP.")

        initialize()

    @handler("cli_reload")
    def cli_reload(self, event):
        """Experimental call to reload the component tree"""

        self.log("Reloading all components.")

        self.update_components(forcereload=True)
        initialize()

        from isomer.debugger import cli_compgraph

        self.fireEvent(cli_compgraph())

    @handler("cli_quit")
    def cli_quit(self, event):
        """Stop the instance immediately"""

        self.log("Quitting on CLI request.")
        if self.frontend_watcher is not None:
            self.frontend_watcher.stop()
        sys.exit()

    @handler("cli_info")
    def cli_info(self, event):
        """Provides information about the running instance"""

        self.log(
            "Instance:",
            self.instance,
            "Dev:",
            self.development,
            "Host:",
            self.host,
            "Port:",
            self.port,
            "Insecure:",
            self.insecure,
            "Frontend:",
            self.frontend_target,
        )

    def _start_server(self, *args):

        """Run the node local server"""

        self.log("Starting server", args)
        secure = self.certificate is not None
        if secure:
            self.log("Running SSL server with cert:", self.certificate)
        else:
            self.log(
                "Running insecure server without SSL. Do not use without SSL proxy in production!",
                lvl=warn,
            )

        try:
            self.server = Server(
                (self.host, self.port),
                display_banner=False,
                secure=secure,
                certfile=self.certificate  # ,
                # inherit=True
            ).register(self)
        except PermissionError as e:
            if self.port <= 1024:
                self.log(
                    "Could not open privileged port (%i), check permissions!"
                    % self.port,
                    e,
                    lvl=critical,
                )
            else:
                self.log("Could not open port (%i):" % self.port, e, lvl=critical)
        except OSError as e:
            if e.errno == 98:
                self.log("Port (%i) is already opened!" % self.port, lvl=critical)
            else:
                self.log("Could not open port (%i):" % self.port, e, lvl=critical)

    def _drop_privileges(self, *args):
        self.log("Dropping privileges", lvl=debug)
        drop_privileges()

    # Moved to manage tool, maybe of interest later, though:
    #
    # @handler("componentupdaterequest", channel="setup")
    # def trigger_component_update(self, event):
    #     self.update_components(forcereload=event.force)

    def update_components(
        self, forcereload=False, forcerebuild=False, forcecopy=True, install=False
    ):
        """Check all known entry points for components. If necessary,
        manage configuration updates"""

        # TODO: See if we can pull out major parts of the component handling.
        # They are also used in the manage tool to instantiate the
        # component frontend bits.

        self.log("Updating components")
        components = {}

        try:

            from pkg_resources import iter_entry_points

            entry_point_tuple = (
                iter_entry_points(group="isomer.base", name=None),
                iter_entry_points(group="isomer.sails", name=None),
                iter_entry_points(group="isomer.components", name=None),
            )
            self.log("Entrypoints:", entry_point_tuple, pretty=True, lvl=verbose)
            for iterator in entry_point_tuple:
                for entry_point in iterator:
                    self.log("Entrypoint:", entry_point, pretty=True, lvl=verbose)
                    try:
                        name = entry_point.name
                        location = entry_point.dist.location
                        loaded = entry_point.load()

                        self.log(
                            "Entry point: ",
                            entry_point,
                            name,
                            entry_point.resolve(),
                            lvl=verbose,
                        )

                        self.log("Loaded: ", loaded, lvl=verbose)
                        comp = {
                            "package": entry_point.dist.project_name,
                            "location": location,
                            "version": str(entry_point.dist.parsed_version),
                            "description": loaded.__doc__,
                        }

                        components[name] = comp
                        self.loadable_components[name] = loaded

                        self.log("Loaded component:", comp, lvl=verbose)

                    except Exception as e:
                        self.log(
                            "Could not inspect entrypoint: ",
                            e,
                            type(e),
                            entry_point,
                            iterator,
                            lvl=error,
                            exc=True,
                        )

                        # for name in components.keys():
                        #     try:
                        #         self.log(self.loadable_components[name])
                        #         configobject = {
                        #             'type': 'object',
                        #             'properties':
                        # self.loadable_components[name].configprops
                        #         }
                        #         ComponentBaseConfigSchema['schema'][
                        # 'properties'][
                        #             'settings'][
                        #             'oneOf'].append(configobject)
                        #     except (KeyError, AttributeError) as e:
                        #         self.log('Problematic configuration
                        # properties in '
                        #                  'component ', name, exc=True)
                        #
                        # schemastore['component'] = ComponentBaseConfigSchema

        except Exception as e:
            self.log("Component update error: ", e, type(e), lvl=error, exc=True)
            return

        self.log(
            "Checking component frontend bits in ", self.frontend_root, lvl=verbose
        )

        # pprint(self.config._fields)
        diff = set(components) ^ set(self.config.components)
        if diff or forcecopy and self.config.frontendenabled:
            self.log("Old component configuration differs:", diff, lvl=debug)
            self.log(self.config.components, components, lvl=verbose)
            self.config.components = components
        else:
            self.log("No component configuration change. Proceeding.")

        if forcereload:
            self.log("Restarting all components.", lvl=warn)
            self._instantiate_components(clear=True)

    def _start_frontend(self, restart=False):

        """Check if it is enabled and start the frontend http & websocket"""

        self.log(self.config, self.config.frontendenabled, lvl=verbose)
        if self.config.frontendenabled and not self.frontend_running or restart:
            self.log("Restarting webfrontend services on", self.frontend_target)

            self.static = Static("/", docroot=self.frontend_target).register(self)
            self.websocket = WebSocketsDispatcher("/websocket").register(self)
            self.frontend_running = True

            if self.development:
                self.frontend_watch_manager = pyinotify.WatchManager()
                self.frontend_watcher = pyinotify.ThreadedNotifier(
                    self.frontend_watch_manager, FrontendHandler(self)
                )
                self.frontend_watcher.start()
                mask = (
                    pyinotify.IN_DELETE | pyinotify.IN_CREATE | pyinotify.IN_CLOSE_WRITE
                )
                self.log("Frontend root:", self.frontend_root, lvl=debug)
                self.frontend_watch_manager.add_watch(self.module_root, mask, rec=True)

    def _instantiate_components(self, clear=True):

        """Inspect all loadable components and run them"""

        if clear:
            # import objgraph
            # from copy import deepcopy
            from circuits.tools import kill
            from circuits import Component

            for comp in self.running_components.values():
                self.log(comp, type(comp), isinstance(comp, Component), pretty=True)
                kill(comp)
            # removables = deepcopy(list(self.runningcomponents.keys()))
            #
            # for key in removables:
            #     comp = self.runningcomponents[key]
            #     self.log(comp)
            #     comp.unregister()
            #     comp.stop()
            #     self.runningcomponents.pop(key)
            #
            #     objgraph.show_backrefs([comp],
            #                            max_depth=5,
            #                            filter=lambda x: type(x) not in [list, tuple, set],
            #                            highlight=lambda x: type(x) in [ConfigurableComponent],
            #                            filename='backref-graph_%s.png' % comp.uniquename)
            #     del comp
            # del removables
            self.running_components = {}

        self.log(
            "Not running blacklisted components: ", self.component_blacklist, lvl=debug
        )

        running = set(self.loadable_components.keys()).difference(
            self.component_blacklist
        )
        self.log("Starting components: ", sorted(running))
        for name, componentdata in self.loadable_components.items():
            if name in self.component_blacklist:
                continue
            self.log("Running component: ", name, lvl=verbose)
            try:
                if name in self.running_components:
                    self.log("Component already running: ", name, lvl=warn)
                else:
                    runningcomponent = componentdata()
                    runningcomponent.register(self)
                    self.running_components[name] = runningcomponent
            except Exception as e:
                self.log(
                    "Could not register component: ",
                    name,
                    e,
                    type(e),
                    lvl=error,
                    exc=True,
                )

    def started(self, component):

        """Sets up the application after startup."""

        self.log("Running.")
        self.log("Started event origin: ", component, lvl=verbose)
        populate_user_events()

        from isomer.events.system import AuthorizedEvents

        self.log(
            len(AuthorizedEvents),
            "authorized event sources:",
            list(AuthorizedEvents.keys()),
            lvl=debug,
        )

        self._instantiate_components()
        self._start_frontend()
        self.fire(ready(), "isomer-web")


def construct_graph(name, instance, args):

    """Preliminary Isomer application Launcher"""

    app = Core(name, instance, **args)

    setup_root(app)

    if args["debug"]:
        from circuits import Debugger

        isolog("Starting circuits debugger", lvl=warn, emitter="GRAPH")
        dbg = Debugger().register(app)
        # TODO: Make these configurable from modules, navdata is _very_ noisy
        # but should not be listed _here_
        dbg.IgnoreEvents.extend(
            [
                "read",
                "_read",
                "write",
                "_write",
                "stream_success",
                "stream_complete",
                "serial_packet",
                "raw_data",
                "stream",
                "navdatapush",
                "referenceframe",
                "updateposition",
                "updatesubscriptions",
                "generatevesseldata",
                "generatenavdata",
                "sensordata",
                "reset_flood_offenders",
                "reset_flood_counters",  # Flood counters
                "task_success",
                "task_done",  # Thread completion
                "keepalive",  # IRC Gateway
            ]
        )

    isolog("Beginning graph assembly.", emitter="GRAPH")

    if args["draw_graph"]:
        from circuits.tools import graph

        graph(app)

    if args["open_gui"]:
        import webbrowser

        # TODO: Fix up that url:
        webbrowser.open("http://%s:%i/" % (args["host"], args["port"]))

    isolog("Graph assembly done.", emitter="GRAPH")

    return app


@click.command()
@click.option(
    "--web-port", "-p", help="Define port for UI server", type=int, default=None
)
@click.option(
    "--web-address",
    "-a",
    help="Define listening address for UI server",
    type=str,
    default="127.0.0.1",
)
@click.option(
    "--web-certificate", "-c", help="Certificate file path", type=str, default=None
)
@click.option("--profile", help="Enable profiler", is_flag=True)
@click.option(
    "--open-gui",
    help="Launch web browser for GUI inspection after startup",
    is_flag=True,
)
@click.option(
    "--draw-graph",
    help="Draw a snapshot of the component graph after construction",
    is_flag=True,
)
@click.option("--live-log", help="Log to in-memory structure as well", is_flag=True)
@click.option("--debug", help="Run circuits debugger", is_flag=True)
@click.option("--dev", help="Run development server", is_flag=True, default=True)
@click.option("--insecure", help="Keep privileges - INSECURE", is_flag=True)
@click.option("--no-run", "-n", help="Only assemble system, do not run", is_flag=True)
@click.option(
    "--blacklist",
    "-b",
    help="Blacklist a component (can be repeated)",
    multiple=True,
    default=[],
)
@click.pass_context
def launch(ctx, run=True, **args):
    """Assemble and run an Isomer instance"""

    isolog("Launching Mini instance")

    if ctx.params["live_log"] is True:
        from isomer import logger

        logger.live = True

    if args["web_certificate"] is not None:
        isolog(
            "Warning! Using SSL on the backend is currently not recommended!",
            lvl=critical,
            emitter="CORE",
        )

    server = construct_graph('MINI', {}, args)
    if run and not args["no_run"]:
        server.run()

    return server

isomeric / isomer

dev.mini.Core.cli_reload() A last analyzed 2021-02-24 12:38 UTC

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dev.mini.Core.cli_reload() A
last analyzed 2021-02-24 12:38 UTC
