Added tasks app

TODO.md

@@ -297,13 +297,8 @@ https://code.djangoproject.com/ticket/24576
 # admin edit relevant djanog settings
 # django SITE_NAME vs ORCHESTRA_SITE_NAME ?
 
-# accounts.migrations link to last auth migration instead of first
-
-
-# DNS allow transfer other NS servers instead of masters and slaves!
 
 Replace celery by a custom solution?
-    # TODO create periodic task like settings, but parsing cronfiles!
     # TODO create decorator wrapper that abstract the task away from the backen (cron/celery)
     # TODO crontab model localhost/autoadded attribute
     * No more jumbo dependencies and wierd bugs
@@ -316,15 +311,49 @@ Replace celery by a custom solution?
             *priority: custom Thread backend
             *bulk: wrapper arround django-mailer to avoid loading django system
 
+python3 -mvenv env-django-orchestra
+source env-django-orchestra/bin/activate
+pip3 install django-orchestra==dev --allow-external django-orchestra --allow-unverified django-orchestra
+pip3 install -r https://raw.githubusercontent.com/glic3rinu/django-orchestra/master/requirements.txt
 
+# TODO make them optional
+sudo apt-get install python3.4-dev libxml2-dev libxslt1-dev libcrack2-dev
+wget -O - https://raw.githubusercontent.com/glic3rinu/django-orchestra/master/requirements.txt | xargs pip3 install 
+django-admin.py startproject panel --template="$HOME/django-orchestra/orchestra/conf/project_template"
+python3 panel/manage.py migrate accounts
+python3 panel/manage.py migrate
+python3 panel/manage.py runserver
+
+
+
+
+
+Collecting lxml==3.3.5 (from -r re (line 22))
+  Downloading lxml-3.3.5.tar.gz (3.5MB)
+    100% |################################| 3.5MB 60kB/s 
+    Building lxml version 3.3.5.
+    Building without Cython.
+    ERROR: b'/bin/sh: 1: xslt-config: not found\n'
+    ** make sure the development packages of libxml2 and libxslt are installed **
+    Using build configuration of libxslt
+    /usr/lib/python3.4/distutils/dist.py:260: UserWarning: Unknown distribution option: 'bugtrack_url'
+      warnings.warn(msg)
+
+
+# Setupcron
 # uwsgi enable threads
-# Create superuser on migrate
 # register signals in app ready()
-def ready(self):
-    if self.has_attr('ready_run'): return
-    self.ready_run = True
-
 # database_ready(): connect to the database or inspect django connection
-# beat.sh
 
-# do settings validation on orchestra.apps.ready(), not during startime
+# move Setting to contrib app __init__
+# cracklib vs crack
+# remove system dependencies
+# deprecate install_dependnecies in favour of only requirements.txt
+# import module and sed
+# if setting.value == default. remove
+# cron backend: os.cron or uwsgi.cron
+# reload generic admin view ?redirect=http...
+# inspecting django db connection for asserting db readines?
+# wake up django mailer on send_mail
+
+# project settings modified copy of django's default project settings

orchestra/__init__.py

@@ -1,3 +1,5 @@
+default_app_config = 'orchestra.apps.OrchestraConfig'
+
 VERSION = (0, 0, 1, 'alpha', 1)
 
 

orchestra/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class OrchestraConfig(AppConfig):
+    name = 'orchestra'
+    verbose_name = 'Orchestra'

orchestra/bin/orchestra-admin

@@ -122,6 +122,11 @@ function install_requirements () {
     check_root || true
     ORCHESTRA_PATH=$(get_orchestra_dir) || true
     
+    # TODO reduce this list to 0
+    # include /usr/sbin/named-checkzone
+    # wkhtmltopdf -> reportlab
+    # remove rabbit, postgres
+    # uwsgi –py-autoreload for devel
     APT="python3 \
          python3-pip \
          python3-psycopg2 \
@@ -137,6 +142,7 @@ function install_requirements () {
          ca-certificates \
          gettext"
     
+    # TODO remove celery deps,  django 1.8.1, glic3rinu fork, celery email
     PIP="django==1.8 \
          django-celery-email==1.0.4 \
          https://github.com/glic3rinu/django-fluent-dashboard/archive/master.zip \
@@ -202,12 +208,14 @@ function install_requirements () {
     
     run pip3 install $PIP
     
+    # TODO remove
     # Some versions of rabbitmq-server will not start automatically by default unless ...
     sed -i "s/# Default-Start:.*/# Default-Start:     2 3 4 5/" /etc/init.d/rabbitmq-server
     sed -i "s/# Default-Stop:.*/# Default-Stop:      0 1 6/" /etc/init.d/rabbitmq-server
     run update-rc.d rabbitmq-server defaults
     
     # Patch passlib
+    # TODO discover locaion by importing it
     IMPORT="from django.contrib.auth.hashers import mask_hash, _"
     COLLECTIONS="from collections import OrderedDict"
     ls /usr/local/lib/python*/dist-packages/passlib/ext/django/utils.py \

orchestra/contrib/domains/settings.py

@@ -89,7 +89,7 @@ DOMAINS_DEFAULT_MX = Setting('DOMAINS_DEFAULT_MX',
         '10 mail.{}.'.format(ORCHESTRA_BASE_DOMAIN),
         '10 mail2.{}.'.format(ORCHESTRA_BASE_DOMAIN),
     ),
-    validators=[lambda mxs: map(validate_mx_record, mxs)],
+    validators=[lambda mxs: list(map(validate_mx_record, mxs))],
     help_text="Uses <tt>ORCHESTRA_BASE_DOMAIN</tt> by default."
 )
 
@@ -99,7 +99,7 @@ DOMAINS_DEFAULT_NS = Setting('DOMAINS_DEFAULT_NS',
         'ns1.{}.'.format(ORCHESTRA_BASE_DOMAIN),
         'ns2.{}.'.format(ORCHESTRA_BASE_DOMAIN),
     ),
-    validators=[lambda nss: map(validate_domain_name, nss)],
+    validators=[lambda nss: list(map(validate_domain_name, nss))],
     help_text="Uses <tt>ORCHESTRA_BASE_DOMAIN</tt> by default."
 )
 
@@ -118,6 +118,6 @@ DOMAINS_FORBIDDEN = Setting('DOMAINS_FORBIDDEN',
 
 DOMAINS_MASTERS = Setting('DOMAINS_MASTERS',
     (),
-    validators=[lambda masters: map(validate_ip_address, masters)],
+    validators=[lambda masters: list(map(validate_ip_address, masters))],
     help_text="Additional master server ip addresses other than autodiscovered by router.get_servers()."
 )

orchestra/contrib/orchestration/tasks.py

@@ -1,9 +1,10 @@
 from datetime import timedelta
 
 from celery.task.schedules import crontab
-from celery.decorators import periodic_task
 from django.utils import timezone
 
+from orchestra.contrib.tasks import periodic_task
+
 from .models import BackendLog
 
 

orchestra/contrib/resources/models.py

@@ -5,7 +5,6 @@ from django.db import models
 from django.utils import timezone
 from django.utils.functional import cached_property
 from django.utils.translation import ugettext_lazy as _
-from djcelery.models import CrontabSchedule
 
 from orchestra.core import validators
 from orchestra.models import queryset, fields
@@ -64,7 +63,7 @@ class Resource(models.Model):
                     "be prorcessed to match with unit. e.g. <tt>10**9</tt>"))
     disable_trigger = models.BooleanField(_("disable trigger"), default=False,
         help_text=_("Disables monitors exeeded and recovery triggers"))
-    crontab = models.ForeignKey(CrontabSchedule, verbose_name=_("crontab"),
+    crontab = models.ForeignKey('djcelery.CrontabSchedule', verbose_name=_("crontab"),
         null=True, blank=True,
         help_text=_("Crontab for periodic execution. "
                     "Leave it empty to disable periodic monitoring"))

orchestra/contrib/resources/tasks.py

@@ -1,12 +1,11 @@
-from celery import shared_task
-
 from orchestra.contrib.orchestration import Operation
+from orchestra.contrib.tasks import task
 from orchestra.models.utils import get_model_field_path
 
 from .backends import ServiceMonitor
 
 
-@shared_task(name='resources.Monitor')
+@task(name='resources.Monitor')
 def monitor(resource_id, ids=None, async=True):
     from .models import ResourceData, Resource
     

orchestra/contrib/settings/admin.py

@@ -86,6 +86,17 @@ class SettingView(generic.edit.FormView):
             messages.success(self.request, _("No changes have been detected."))
         return super(SettingView, self).form_valid(form)
 
+from orchestra.contrib.tasks import task
+import time, sys
+@task(name='rata')
+def counter(num, log):
+    for i in range(1, num):
+        with open(log, 'a') as handler:
+            handler.write(str(i))
+#        sys.stderr.write('hola\n')
+        time.sleep(1)
+#counter.apply_async(10, '/tmp/kakas')
+
 
 class SettingFileView(generic.TemplateView):
     template_name = 'admin/settings/view.html'

orchestra/contrib/tasks/__init__.py

@@ -0,0 +1,103 @@
+import traceback
+from functools import partial, wraps, update_wrapper
+from multiprocessing import Process
+from uuid import uuid4
+from threading import Thread
+
+from celery import shared_task as celery_shared_task
+from celery import states
+from celery.decorators import periodic_task as celery_periodic_task
+from django.utils import timezone
+
+from orchestra.utils.db import close_connection
+from orchestra.utils.python import AttrDict, OrderedSet
+
+
+def get_id():
+    return str(uuid4())
+
+
+def get_name(fn):
+    return '.'.join((fn.__module__, fn.__name__))
+
+
+def keep_state(fn):
+    """ logs task on djcelery's TaskState model """
+    @wraps(fn)
+    def wrapper(task_id, name, *args, **kwargs):
+        from djcelery.models import TaskState
+        now = timezone.now()
+        state = TaskState.objects.create(state=states.STARTED, task_id=task_id, name=name, args=str(args),
+            kwargs=str(kwargs), tstamp=now)
+        try:
+            result = fn(*args, **kwargs)
+        except Exception as exc:
+            state.state = states.FAILURE
+            state.traceback = traceback.format_exc()
+            state.runtime = (timezone.now()-now).total_seconds()
+            state.save()
+            return
+            # TODO send email
+        else:
+            state.state = states.SUCCESS
+            state.result = str(result)
+            state.runtime = (timezone.now()-now).total_seconds()
+            state.save()
+        return result
+    return wrapper
+
+
+def apply_async(fn, name=None, method='thread'):
+    """ replaces celery apply_async """
+    def inner(fn, name, method, *args, **kwargs):
+        task_id = get_id()
+        args = (task_id, name) + args
+        thread = Process(target=fn, args=args, kwargs=kwargs)
+        thread.start()
+        # Celery API compat
+        thread.request = AttrDict(id=task_id)
+        return thread
+    if name is None:
+        name = get_name(fn)
+    if method == 'thread':
+        method = Thread
+    elif method == 'process':
+        method = Process
+    else:
+        raise NotImplementedError("Support for %s concurrency method is not supported." % method)
+    fn.apply_async = partial(inner, close_connection(keep_state(fn)), name, method)
+    return fn
+
+
+def apply_async_override(fn, name):
+    if fn is None:
+        def decorator(fn):
+            return update_wrapper(apply_async(fn), fn)
+        return decorator
+    return update_wrapper(apply_async(fn, name), fn)
+
+
+def task(fn=None, **kwargs):
+    from . import settings
+    # register task
+    if fn is None:
+        fn = celery_shared_task(**kwargs)
+    else:
+        fn = celery_shared_task(fn)
+    if settings.TASKS_BACKEND in ('thread', 'process'):
+        name = kwargs.pop('name', None)
+        apply_async_override(fn, name)
+    return fn
+
+
+def periodic_task(fn=None, **kwargs):
+    from . import settings
+    # register task
+    if fn is None:
+        fn = celery_periodic_task(**kwargs)
+    else:
+        fn = celery_periodic_task(fn)
+    if settings.TASKS_BACKEND in ('thread', 'process'):
+        name = kwargs.pop('name', None)
+        apply_async_override(fn, name)
+    return fn

orchestra/contrib/tasks/admin.py

@@ -0,0 +1,9 @@
+from django.utils.translation import ugettext_lazy as _
+from djcelery.admin import PeriodicTaskAdmin
+
+from orchestra.admin.utils import admin_date
+
+
+display_last_run_at = admin_date('last_run_at', short_description=_("Last run"))
+
+PeriodicTaskAdmin.list_display = ('__unicode__', display_last_run_at, 'total_run_count', 'enabled')

orchestra/contrib/tasks/beat.py

@@ -0,0 +1,43 @@
+import json
+
+from celery import current_app
+from celery.schedules import crontab_parser as CrontabParser
+from django.utils import timezone
+from djcelery.models import PeriodicTask
+
+from . import apply_async
+
+
+def is_due(task, time=None):
+    if time is None:
+        time = timezone.now()
+    crontab = task.crontab
+    parts = map(int, time.strftime("%M %H %w %d %m").split())
+    n_minute, n_hour, n_day_of_week, n_day_of_month, n_month_of_year = parts
+    return bool(
+        n_minute in CrontabParser(60).parse(crontab.minute) and
+        n_hour in CrontabParser(24).parse(crontab.hour) and
+        n_day_of_week in CrontabParser(7).parse(crontab.day_of_week) and
+        n_day_of_month in CrontabParser(31, 1).parse(crontab.day_of_month) and
+        n_month_of_year in CrontabParser(12, 1).parse(crontab.month_of_year)
+    )
+
+
+def run_task(task, thread=True, process=False, async=False):
+    args = json.loads(task.args)
+    kwargs = json.loads(task.kwargs)
+    task_fn = current_app.tasks.get(task.task)
+    if async:
+        method = 'process' if process else 'thread'
+        return apply_async(task_fn, method=method).apply_async(*args, **kwargs)
+    return task_fn(*args, **kwargs)
+
+
+def run():
+    now = timezone.now()
+    procs = []
+    for task in PeriodicTask.objects.enabled().select_related('crontab'):
+        if is_due(task, now):
+            proc = run_task(task, process=True, async=True)
+            procs.append(proc)
+    [proc.join() for proc in procs]

orchestra/contrib/tasks/bin/orchestra-beat

@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+
+# High performance alternative to beat management command
+#
+# USAGE: beat /path/to/project/manage.py
+
+
+import json
+import os
+import re
+import sys
+from datetime import datetime
+
+from orchestra.utils import db
+from orchestra.utils.python import import_class
+from orchestra.utils.sys import run, join
+
+from celery.schedules import crontab_parser as CrontabParser
+
+
+def get_settings_file(manage):
+    with open(manage, 'r') as handler:
+        regex = re.compile(r'"DJANGO_SETTINGS_MODULE"\s*,\s*"([^"]+)"')
+        for line in handler.readlines():
+            match = regex.search(line)
+            if match:
+                settings_module = match.groups()[0]
+                settings_file = os.path.join(*settings_module.split('.')) + '.py'
+                settings_file = os.path.join(os.path.dirname(manage), settings_file)
+                return settings_file
+    raise ValueError("settings module not found in %s" % manage)
+
+
+def get_tasks(manage):
+    settings_file = get_settings_file(manage)
+    settings = db.get_settings(settings_file)
+    try:
+        conn = db.get_connection(settings)
+    except:
+        sys.stdout.write("ERROR")
+        sys.stderr.write("I am unable to connect to the database\n")
+        sys.exit(1)
+    script, settings_file = sys.argv[:2]
+    query = (
+        "SELECT c.minute, c.hour, c.day_of_week, c.day_of_month, c.month_of_year, p.id "
+        "FROM djcelery_periodictask as p, djcelery_crontabschedule as c "
+        "WHERE p.crontab_id = c.id AND p.enabled = True"
+    )
+    tasks = db.run_query(conn, query)
+    conn.close()
+    return tasks
+
+
+def is_due(now, minute, hour, day_of_week, day_of_month, month_of_year):
+    n_minute, n_hour, n_day_of_week, n_day_of_month, n_month_of_year = now
+    return (
+        n_minute in CrontabParser(60).parse(minute) and
+        n_hour in CrontabParser(24).parse(hour) and
+        n_day_of_week in CrontabParser(7).parse(day_of_week) and
+        n_day_of_month in CrontabParser(31, 1).parse(day_of_month) and
+        n_month_of_year in CrontabParser(12, 1).parse(month_of_year)
+    )
+
+
+if __name__ == "__main__":
+    manage = sys.argv[1]
+    now = datetime.utcnow()
+    now = tuple(map(int, now.strftime("%M %H %w %d %m").split()))
+    procs = []
+    for minute, hour, day_of_week, day_of_month, month_of_year, task_id in get_tasks(manage):
+        if is_due(now, minute, hour, day_of_week, day_of_month, month_of_year):
+            command = 'python3 -W ignore::DeprecationWarning {manage} runtask {task_id}'.format(
+                manage=manage, task_id=task_id)
+            proc = run(command, async=True)
+            procs.append(proc)
+    code = 0
+    for proc in procs:
+        result = join(proc)
+        sys.stdout.write(result.stdout.decode('utf8'))
+        sys.stderr.write(result.stderr.decode('utf8'))
+        if result.return_code != 0:
+            code = result.return_code
+    sys.exit(code)

orchestra/contrib/tasks/management/commands/beat.py

@@ -0,0 +1,10 @@
+from django.core.management.base import BaseCommand, CommandError
+
+from ... import beat
+
+
+class Command(BaseCommand):
+    help = 'Runs periodic tasks.'
+    
+    def handle(self, *args, **options):
+        beat.run()

orchestra/contrib/tasks/management/commands/runfunction.py

@@ -0,0 +1,32 @@
+from django.core.management.base import BaseCommand, CommandError
+
+from orchestra.utils.python import import_class
+
+from ... import keep_state, get_id, get_name
+
+
+class Command(BaseCommand):
+    help = 'Runs Orchestra method.'
+    
+    def add_arguments(self, parser):
+        parser.add_argument('method',
+            help='Python path to the method to execute.')
+        parser.add_argument('args', nargs='*',
+            help='Additional arguments passed to the method.')
+    
+    def handle(self, *args, **options):
+        method = import_class(options['method'])
+        kwargs = {}
+        arguments = []
+        for arg in args:
+            if '=' in args:
+                name, value = arg.split('=')
+                if value.isdigit():
+                    value = int(value)
+                kwargs[name] = value
+            else:
+                if arg.isdigit():
+                    arg = int(arg)
+                arguments.append(arg)
+        args = arguments
+        keep_state(method)(get_id(), get_name(method), *args, **kwargs)

orchestra/contrib/tasks/management/commands/runtask.py

@@ -0,0 +1,49 @@
+import json
+
+from celery import current_app
+from django.core.management.base import BaseCommand, CommandError
+from django.utils import timezone
+from djcelery.models import PeriodicTask
+
+from ... import keep_state, get_id, get_name
+
+
+class Command(BaseCommand):
+    help = 'Runs Orchestra method.'
+    
+    def add_arguments(self, parser):
+        parser.add_argument('task',
+            help='Periodic task ID or task name.')
+        parser.add_argument('args', nargs='*',
+            help='Additional arguments passed to the task, when task name is used.')
+    
+    def handle(self, *args, **options):
+
+        task = options.get('task')
+        if task.isdigit():
+            # periodic task
+            ptask = PeriodicTask.objects.get(pk=int(task))
+            task = current_app.tasks[ptask.task]
+            args = json.loads(ptask.args)
+            kwargs = json.loads(ptask.kwargs)
+            ptask.last_run_at = timezone.now()
+            ptask.total_run_count += 1
+            ptask.save()
+        else:
+            # task name
+            task = current_app.tasks[task]
+            kwargs = {}
+            arguments = []
+            for arg in args:
+                if '=' in args:
+                    name, value = arg.split('=')
+                    if value.isdigit():
+                        value = int(value)
+                    kwargs[name] = value
+                else:
+                    if arg.isdigit():
+                        arg = int(arg)
+                    arguments.append(arg)
+            args = arguments
+        # Run task synchronously, but logging TaskState
+        keep_state(task)(get_id(), get_name(task), *args, **kwargs)

orchestra/contrib/tasks/management/commands/syncperiodictasks.py

@@ -0,0 +1,2 @@
+# create crontab entries for defines periodic tasks
+

orchestra/contrib/tasks/parser.py

@@ -0,0 +1,61 @@
+import os
+
+
+# Rename module to handler.py
+class CronHandler(object):
+    def __init__(self, filename):
+        self.content = None
+        self.filename = filename
+    
+    def read(self):
+        comments = []
+        self.content = []
+        with open(self.filename, 'r') as handler:
+            for line in handler.readlines():
+                line = line.strip()
+                if line.startswith('#'):
+                    comments.append(line)
+                else:
+                    schedule = line.split()[:5]
+                    command = ' '.join(line.split()[5:]).strip()
+                    self.content.append((schedule, command, comments))
+                    comments = []
+    
+    def save(self, backup=True):
+        if self.content is None:
+            raise Exception("First read() the cron file!")
+        if backup:
+            os.rename(self.filename, self.filename + '.backup')
+        with open(self.filename, 'w') as handler:
+            handler.write('\n'.join(self.content))
+            handler.truncate()
+        self.reload()
+    
+    def reload(self):
+        pass
+        # TODO
+    
+    def remove(self, command):
+        if self.content is None:
+            raise Exception("First read() the cron file!")
+        new_content = []
+        for c_schedule, c_command, c_comments in self.content:
+            if command != c_command:
+                new_content.append((c_schedule, c_command, c_comments))
+        self.content = new_content
+    
+    def add_or_update(self, schedule, command, comments=None):
+        """ if content contains an equal command, its schedule is updated """
+        if self.content is None:
+            raise Exception("First read() the cron file!")
+        new_content = []
+        replaced = False
+        for c_schedule, c_command, c_comments in self.content:
+            if command == c_command:
+                replaced = True
+                new_content.append((schedule, command, comments or c_comments))
+            else:
+                new_content.append((c_schedule, c_command, c_comments))
+        if not replaced:
+            new_content.append((schedule, command, comments or []))
+        self.content = new_content

orchestra/contrib/tasks/schedules.py

@@ -0,0 +1,119 @@
+#import re
+
+
+#class CronTab(object):
+#    pass
+
+
+#class ParseException(Exception):
+#    """Raised by crontab_parser when the input can't be parsed."""
+
+
+## https://github.com/celery/celery/blob/master/celery/schedules.py
+#class CrontabParser(object):
+#    """Parser for crontab expressions. Any expression of the form 'groups'
+#    (see BNF grammar below) is accepted and expanded to a set of numbers.
+#    These numbers represent the units of time that the crontab needs to
+#    run on::
+#        digit   :: '0'..'9'
+#        dow     :: 'a'..'z'
+#        number  :: digit+ | dow+
+#        steps   :: number
+#        range   :: number ( '-' number ) ?
+#        numspec :: '*' | range
+#        expr    :: numspec ( '/' steps ) ?
+#        groups  :: expr ( ',' expr ) *
+#    The parser is a general purpose one, useful for parsing hours, minutes and
+#    day_of_week expressions.  Example usage::
+#        >>> minutes = crontab_parser(60).parse('*/15')
+#        [0, 15, 30, 45]
+#        >>> hours = crontab_parser(24).parse('*/4')
+#        [0, 4, 8, 12, 16, 20]
+#        >>> day_of_week = crontab_parser(7).parse('*')
+#        [0, 1, 2, 3, 4, 5, 6]
+#    It can also parse day_of_month and month_of_year expressions if initialized
+#    with an minimum of 1.  Example usage::
+#        >>> days_of_month = crontab_parser(31, 1).parse('*/3')
+#        [1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31]
+#        >>> months_of_year = crontab_parser(12, 1).parse('*/2')
+#        [1, 3, 5, 7, 9, 11]
+#        >>> months_of_year = crontab_parser(12, 1).parse('2-12/2')
+#        [2, 4, 6, 8, 10, 12]
+#    The maximum possible expanded value returned is found by the formula::
+#        max_ + min_ - 1
+#    """
+#    ParseException = ParseException
+
+#    _range = r'(\w+?)-(\w+)'
+#    _steps = r'/(\w+)?'
+#    _star = r'\*'
+
+#    def __init__(self, max_=60, min_=0):
+#        self.max_ = max_
+#        self.min_ = min_
+#        self.pats = (
+#            (re.compile(self._range + self._steps), self._range_steps),
+#            (re.compile(self._range), self._expand_range),
+#            (re.compile(self._star + self._steps), self._star_steps),
+#            (re.compile('^' + self._star + '$'), self._expand_star),
+#        )
+
+#    def parse(self, spec):
+#        acc = set()
+#        for part in spec.split(','):
+#            if not part:
+#                raise self.ParseException('empty part')
+#            acc |= set(self._parse_part(part))
+#        return acc
+
+#    def _parse_part(self, part):
+#        for regex, handler in self.pats:
+#            m = regex.match(part)
+#            if m:
+#                return handler(m.groups())
+#        return self._expand_range((part, ))
+
+#    def _expand_range(self, toks):
+#        fr = self._expand_number(toks[0])
+#        if len(toks) > 1:
+#            to = self._expand_number(toks[1])
+#            if to < fr:  # Wrap around max_ if necessary
+#                return (list(range(fr, self.min_ + self.max_)) +
+#                        list(range(self.min_, to + 1)))
+#            return list(range(fr, to + 1))
+#        return [fr]
+
+#    def _range_steps(self, toks):
+#        if len(toks) != 3 or not toks[2]:
+#            raise self.ParseException('empty filter')
+#        return self._expand_range(toks[:2])[::int(toks[2])]
+
+#    def _star_steps(self, toks):
+#        if not toks or not toks[0]:
+#            raise self.ParseException('empty filter')
+#        return self._expand_star()[::int(toks[0])]
+
+#    def _expand_star(self, *args):
+#        return list(range(self.min_, self.max_ + self.min_))
+
+#    def _expand_number(self, s):
+#        if isinstance(s, str) and s[0] == '-':
+#            raise self.ParseException('negative numbers not supported')
+#        try:
+#            i = int(s)
+#        except ValueError:
+#            try:
+#                i = weekday(s)
+#            except KeyError:
+#                raise ValueError('Invalid weekday literal {0!r}.'.format(s))
+
+#        max_val = self.min_ + self.max_ - 1
+#        if i > max_val:
+#            raise ValueError(
+#                'Invalid end range: {0} > {1}.'.format(i, max_val))
+#        if i < self.min_:
+#            raise ValueError(
+#                'Invalid beginning range: {0} < {1}.'.format(i, self.min_))
+
+#        return i
+

orchestra/contrib/tasks/settings.py

@@ -0,0 +1,11 @@
+from orchestra.settings import Setting
+
+
+TASKS_BACKEND = Setting('TASKS_BACKEND',
+    'thread',
+    choices=(
+        ('thread', "threading.Thread (no queue)"),
+        ('process', "multiprocess.Process (no queue)"),
+        ('celery', "Celery (with queue)"),
+    )
+)

orchestra/contrib/tasks/utils.py

@@ -0,0 +1,12 @@
+import threading
+
+from orchestra.utils.db import close_connection
+
+
+# TODO import as_task
+
+def run(method, *args, **kwargs):
+    async = kwargs.pop('async', True)
+    thread = threading.Thread(target=close_connection(method), args=args, kwargs=kwargs)
+    thread = Process(target=close_connection(counter))
+    thread.start()

orchestra/forms/widgets.py

@@ -29,7 +29,7 @@ class SpanWidget(forms.Widget):
             return mark_safe('<img src="%s" alt="%s">' % (icon, str(display)))
         tag = self.tag[:-1]
         endtag = '/'.join((self.tag[0], self.tag[1:]))
-        return mark_safe('%s%s >%s%s' % (tag, forms.util.flatatt(final_attrs), display, endtag))
+        return mark_safe('%s%s >%s%s' % (tag, forms.utils.flatatt(final_attrs), display, endtag))
     
     def value_from_datadict(self, data, files, name):
         return self.original

orchestra/models/utils.py

@@ -1,18 +1,18 @@
 from django.conf import settings
-from django.db.models import loading
+from django.apps import apps
 import importlib
 
 
 def get_model(label, import_module=True):
     app_label, model_name = label.split('.')
-    model = loading.get_model(app_label, model_name)
+    model = apps.get_model(app_label, model_name)
     if model is None:
         # Sometimes the models module is not yet imported
         for app in settings.INSTALLED_APPS:
             if app.endswith(app_label):
                 app_label = app
         importlib.import_module('%s.%s' % (app_label, 'admin'))
-        return loading.get_model(*label.split('.'))
+        return apps.get_model(*label.split('.'))
     return model
 
 

orchestra/settings.py

@@ -3,6 +3,7 @@ import sys
 from collections import OrderedDict
 
 from django.conf import settings
+from django.core.checks import register, Error
 from django.core.exceptions import ValidationError, AppRegistryNotReady
 from django.core.validators import validate_email
 from django.db.models import get_model
@@ -42,16 +43,6 @@ class Setting(object):
         for name, value in kwargs.items():
             setattr(self, name, value)
         self.value = self.get_value(self.name, self.default)
-        try:
-            self.validate_value(self.value)
-        except ValidationError as exc:
-            # Init time warning
-            sys.stderr.write("Error validating setting %s with value %s\n" % (self.name, self.value))
-            sys.stderr.write(format_exception(exc))
-            raise exc
-        except AppRegistryNotReady:
-            # lazy bastards
-            pass
         self.settings[name] = self
     
     @classmethod
@@ -117,6 +108,19 @@ class Setting(object):
         return getattr(cls.conf_settings, name, default)
 
 
+@register()
+def check_settings(app_configs, **kwargs):
+    """ perfroms all the validation """
+    messages = []
+    for name, setting in Setting.settings.items():
+        try:
+            setting.validate_value(setting.value)
+        except ValidationError as exc:
+            msg = "Error validating setting with value %s: %s" % (setting.value, str(exc))
+            messages.append(Error(msg, obj=name, id='settings.E001'))
+    return messages
+
+
 ORCHESTRA_BASE_DOMAIN = Setting('ORCHESTRA_BASE_DOMAIN',
     'orchestra.lan',
     help_text=("Base domain name used for other settings.<br>"

orchestra/utils/db.py

@@ -0,0 +1,49 @@
+import ast
+
+from django import db
+
+
+def close_connection(execute):
+    """ Threads have their own connection pool, closing it when finishing """
+    def wrapper(*args, **kwargs):
+        try:
+            log = execute(*args, **kwargs)
+        except Exception as e:
+            pass
+        else:
+            wrapper.log = log
+        finally:
+            db.connection.close()
+    return wrapper
+
+
+def get_settings(settings_file):
+    """ get db settings from settings.py file without importing """
+    settings = {}
+    with open(settings_file, 'r') as handler:
+        body = ast.parse(handler.read()).body
+        for var in body:
+            targets = getattr(var, 'targets', None)
+            if targets and targets[0].id == 'DATABASES':
+                keys = var.value.values[0].keys
+                values = var.value.values[0].values
+                for key, value in zip(keys, values):
+                    if key.s == 'ENGINE':
+                        if not 'postgresql' in value.s:
+                            raise ValueError("%s engine not supported." % value)
+                    settings[key.s] = getattr(value, 's', None)
+                return settings
+
+
+def get_connection(settings):
+    import psycopg2
+    conn = psycopg2.connect("dbname='{NAME}' user='{USER}' host='{HOST}' password='{PASSWORD}'".format(**settings))
+    return conn
+
+
+def run_query(conn, query):
+    cur = conn.cursor()
+    cur.execute(query)
+    result = cur.fetchall()
+    cur.close()
+    return result

orchestra/utils/sys.py

@@ -45,7 +45,7 @@ def read_async(fd):
             return ''
 
 
-def runiterator(command, display=False, error_codes=[0], silent=False, stdin=b''):
+def runiterator(command, display=False, stdin=b''):
     """ Subprocess wrapper for running commands concurrently """
     if display:
         sys.stderr.write("\n\033[1m $ %s\033[0m\n" % command)
@@ -83,6 +83,7 @@ def runiterator(command, display=False, error_codes=[0], silent=False, stdin=b''
         state = _Attribute(stdout)
         state.stderr = stderr
         state.return_code =  p.poll()
+        state.command = command
         yield state
         
         if state.return_code != None:
@@ -90,13 +91,8 @@ def runiterator(command, display=False, error_codes=[0], silent=False, stdin=b''
             p.stderr.close()
             raise StopIteration
 
-
-def run(command, display=False, error_codes=[0], silent=False, stdin=b'', async=False):
-    iterator = runiterator(command, display, error_codes, silent, stdin)
-    next(iterator)
-    if async:
-        return iterator
-    
+def join(iterator, display=False, silent=False, error_codes=[0]):
+    """ joins the iterator process """
     stdout = b''
     stderr = b''
     for state in iterator:
@@ -114,7 +110,7 @@ def run(command, display=False, error_codes=[0], silent=False, stdin=b'', async=
     if return_code not in error_codes:
         out.failed = True
         msg = "\nrun() encountered an error (return code %s) while executing '%s'\n"
-        msg = msg % (return_code, command)
+        msg = msg % (return_code, state.command)
         if display:
             sys.stderr.write("\n\033[1;31mCommandError: %s %s\033[m\n" % (msg, err))
         if not silent:
@@ -124,6 +120,14 @@ def run(command, display=False, error_codes=[0], silent=False, stdin=b'', async=
     return out
 
 
+def run(command, display=False, error_codes=[0], silent=False, stdin=b'', async=False):
+    iterator = runiterator(command, display, stdin)
+    next(iterator)
+    if async:
+        return iterator
+    return join(iterator, display=display, silent=silent, error_codes=error_codes)
+
+
 def sshrun(addr, command, *args, **kwargs):
     command = command.replace("'", """'"'"'""")
     cmd = "ssh -o stricthostkeychecking=no -C root@%s '%s'" % (addr, command)

requirements.txt

@@ -1,6 +1,6 @@
 cracklib
 psycopg2
-django==1.8 
+django==1.8.1
 django-celery-email==1.0.4 
 https://github.com/glic3rinu/django-fluent-dashboard/archive/master.zip 
 https://bitbucket.org/izi/django-admin-tools/get/a0abfffd76a0.zip 

setup.py

@@ -27,7 +27,10 @@ setup(
         "The goal of this project is to provide the tools for easily build a fully "
         "featured control panel that fits any service architecture."),
     include_package_data = True,
-    scripts=['orchestra/bin/orchestra-admin'],
+    scripts=[
+        'orchestra/bin/orchestra-admin',
+        'orchestra/contrib/tasks/bin/orchestra-beat',
+    ],
     packages = packages,
     classifiers = [
         'Development Status :: 1 - Alpha',