Initial commit

rattail_tempmon/__init__.py

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+# -*- coding: utf-8 -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2016 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail 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.
+#
+#  Rattail 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 Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Rattail Temperature Monitoring
+"""
+
+from ._version import __version__

rattail_tempmon/_version.py

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+# -*- coding: utf-8 -*-
+
+__version__ = u'0.1.0'

rattail_tempmon/client.py

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+# -*- coding: utf-8 -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2016 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail 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.
+#
+#  Rattail 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 Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+TempMon client daemon
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+import time
+import datetime
+import socket
+import logging
+
+from rattail.daemon import Daemon
+from rattail_tempmon.db import Session, model as tempmon
+
+
+log = logging.getLogger(__name__)
+
+
+class TempmonClient(Daemon):
+    """
+    Linux daemon implementation of Tempmon client
+    """
+
+    def run(self):
+        """
+        This method is invoked upon daemon startup.  It is meant to run/loop
+        "forever" or until daemon stop.
+        """
+        # figure out which client we are
+        session = Session()
+        client = session.query(tempmon.Client)\
+                        .filter_by(hostname=socket.gethostname())\
+                        .one()
+        client_uuid = client.uuid
+        session.close()
+
+        # main loop: take readings, pause, repeat
+        while True:
+            session = Session()
+            client = session.query(tempmon.Client).get(client_uuid)
+            if client.enabled:
+
+                try:
+                    for probe in client.enabled_probes():
+                        self.take_reading(session, probe)
+
+                except:
+                    log.exception("Failed to read/record temperature data")
+                    session.rollback()
+                    raise
+
+                else:
+                    # make sure we show as being online
+                    if not client.online:
+                        client.online = True
+                    session.commit()
+
+                finally:
+                    session.close()
+
+            else:
+                session.close()
+
+            # TODO: make this configurable
+            time.sleep(60)
+
+    def take_reading(self, session, probe):
+        """
+        Take a single reading and add to Rattail database.
+        """
+        reading = tempmon.Reading()
+        reading.client = probe.client
+        reading.probe = probe
+        reading.degrees_f = self.read_temp(probe)
+        reading.taken = datetime.datetime.utcnow()
+        session.add(reading)
+        return reading
+
+    def read_temp(self, probe):
+        """
+        Check for good reading, then format temperature to our liking
+        """
+        lines = self.read_temp_raw(probe)
+        while lines[0].strip()[-3:] != 'YES':
+            time.sleep(0.2)
+            lines = self.read_temp_raw(probe)
+        equals_pos = lines[1].find('t=')
+        if equals_pos != -1:
+            temp_string = lines[1][equals_pos+2:]
+            temp_c = float(temp_string) / 1000.0
+            temp_f = temp_c * 9.0 / 5.0 + 32.0
+            return round(temp_f,4)
+
+    def read_temp_raw(self, probe):
+        """
+        Function that gets the raw temp data
+        """
+        with open(probe.device_path, 'rt') as therm_file:
+            return therm_file.readlines()
+
+
+def make_daemon(config, pidfile=None):
+    """
+    Returns a tempmon client daemon instance.
+    """
+    if not pidfile:
+        pidfile = config.get('rattail.tempmon', 'client.pid_path',
+                             default='/var/run/rattail/tempmon-client.pid')
+    return TempmonClient(pidfile, config=config)

rattail_tempmon/commands.py

@@ -0,0 +1,89 @@
+# -*- coding: utf-8 -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2016 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail 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.
+#
+#  Rattail 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 Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Tempmon commands
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+from rattail.commands import Subcommand
+
+
+class TempmonClient(Subcommand):
+    """
+    Manage the tempmon-client daemon
+    """
+    name = 'tempmon-client'
+    description = __doc__.strip()
+
+    def add_parser_args(self, parser):
+        subparsers = parser.add_subparsers(title='subcommands')
+
+        start = subparsers.add_parser('start', help="Start daemon")
+        start.set_defaults(subcommand='start')
+        stop = subparsers.add_parser('stop', help="Stop daemon")
+        stop.set_defaults(subcommand='stop')
+
+        parser.add_argument('-p', '--pidfile',
+                            help="Path to PID file.", metavar='PATH')
+        parser.add_argument('-D', '--daemonize', action='store_true',
+                            help="Daemonize when starting.")
+
+    def run(self, args):
+        from rattail_tempmon.client import make_daemon
+
+        daemon = make_daemon(self.config, args.pidfile)
+        if args.subcommand == 'start':
+            daemon.start(args.daemonize)
+        elif args.subcommand == 'stop':
+            daemon.stop()
+
+
+class TempmonServer(Subcommand):
+    """
+    Manage the tempmon-server daemon
+    """
+    name = 'tempmon-server'
+    description = __doc__.strip()
+
+    def add_parser_args(self, parser):
+        subparsers = parser.add_subparsers(title='subcommands')
+
+        start = subparsers.add_parser('start', help="Start daemon")
+        start.set_defaults(subcommand='start')
+        stop = subparsers.add_parser('stop', help="Stop daemon")
+        stop.set_defaults(subcommand='stop')
+
+        parser.add_argument('-p', '--pidfile',
+                            help="Path to PID file.", metavar='PATH')
+        parser.add_argument('-D', '--daemonize', action='store_true',
+                            help="Daemonize when starting.")
+
+    def run(self, args):
+        from rattail_tempmon.server import make_daemon
+
+        daemon = make_daemon(self.config, args.pidfile)
+        if args.subcommand == 'start':
+            daemon.start(args.daemonize)
+        elif args.subcommand == 'stop':
+            daemon.stop()

rattail_tempmon/config.py

@@ -0,0 +1,56 @@
+# -*- coding: utf-8 -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2016 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail 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.
+#
+#  Rattail 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 Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Tempmon config extension
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+from rattail.config import ConfigExtension
+from rattail.db.config import get_engines
+from rattail_tempmon.db import Session
+
+
+class TempmonConfigExtension(ConfigExtension):
+    """
+    Config extension for tempmon; adds tempmon DB engine/Session etc.  Expects
+    something like this in your config:
+
+    .. code-block:: ini
+
+       [rattail_tempmon.db]
+       default.url = postgresql://localhost/tempmon
+
+    Config object will get two new attributes:
+
+     * ``tempmon_engines``
+     * ``tempmon_engine``
+
+    Additionally, :class:`Session` will be configured with the default engine.
+    """
+    key = 'tempmon'
+
+    def configure(self, config):
+        config.tempmon_engines = get_engines(config, section='rattail_tempmon.db')
+        config.tempmon_engine = config.tempmon_engines.get('default')
+        Session.configure(bind=config.tempmon_engine)

rattail_tempmon/db/__init__.py

@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2016 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail 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.
+#
+#  Rattail 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 Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Tempmon database stuff
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+from sqlalchemy import orm
+
+
+Session = orm.sessionmaker()

rattail_tempmon/db/alembic/README

@@ -0,0 +1 @@
+Generic single-database configuration.

rattail_tempmon/db/alembic/env.py

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+# -*- coding: utf-8 -*-
+"""
+Alembic Environment Script
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+from alembic import context
+
+from rattail.config import make_config
+from rattail_tempmon.db import model as tempmon
+
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use
+alembic_config = context.config
+
+# Use same config file for Rattail, as we are for Alembic.
+rattail_config = make_config(alembic_config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = tempmon.Base.metadata
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    engine = rattail_config.tempmon_engine
+    context.configure(
+        url=engine.url,
+        target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    engine = rattail_config.tempmon_engine
+    connection = engine.connect()
+    context.configure(
+        connection=connection,
+        target_metadata=target_metadata)
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

rattail_tempmon/db/alembic/script.py.mako

@@ -0,0 +1,30 @@
+# -*- coding: utf-8; mode: python -*-
+# -*- coding: utf-8 -*-
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+from alembic import op
+import sqlalchemy as sa
+import rattail.db.types
+${imports if imports else ""}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

rattail_tempmon/db/alembic/versions/7c7d205787b0_initial_tables.py

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+# -*- coding: utf-8 -*-
+"""initial tables
+
+Revision ID: 7c7d205787b0
+Revises: 
+Create Date: 2016-12-05 15:14:09.387668
+
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+# revision identifiers, used by Alembic.
+revision = '7c7d205787b0'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+import rattail.db.types
+
+
+
+def upgrade():
+
+    # client
+    op.create_table('client',
+                    sa.Column('uuid', sa.String(length=32), nullable=False),
+                    sa.Column('config_key', sa.String(length=50), nullable=False),
+                    sa.Column('hostname', sa.String(length=255), nullable=False),
+                    sa.Column('location', sa.String(length=255), nullable=True),
+                    sa.Column('enabled', sa.Boolean(), nullable=False),
+                    sa.Column('online', sa.Boolean(), nullable=False),
+                    sa.PrimaryKeyConstraint('uuid'),
+                    sa.UniqueConstraint('config_key', name=u'client_uq_config_key')
+    )
+
+    # probe
+    op.create_table('probe',
+                    sa.Column('uuid', sa.String(length=32), nullable=False),
+                    sa.Column('client_uuid', sa.String(length=32), nullable=False),
+                    sa.Column('config_key', sa.String(length=50), nullable=False),
+                    sa.Column('appliance_type', sa.Integer(), nullable=False),
+                    sa.Column('description', sa.String(length=255), nullable=False),
+                    sa.Column('device_path', sa.String(length=255), nullable=True),
+                    sa.Column('enabled', sa.Boolean(), nullable=False),
+                    sa.Column('good_temp_min', sa.Integer(), nullable=False),
+                    sa.Column('good_temp_max', sa.Integer(), nullable=False),
+                    sa.Column('critical_temp_min', sa.Integer(), nullable=False),
+                    sa.Column('critical_temp_max', sa.Integer(), nullable=False),
+                    sa.Column('therm_status_timeout', sa.Integer(), nullable=False),
+                    sa.Column('status_alert_timeout', sa.Integer(), nullable=False),
+                    sa.Column('status', sa.Integer(), nullable=True),
+                    sa.Column('status_changed', sa.DateTime(), nullable=True),
+                    sa.Column('status_alert_sent', sa.DateTime(), nullable=True),
+                    sa.ForeignKeyConstraint(['client_uuid'], [u'client.uuid'], name=u'probe_fk_client'),
+                    sa.PrimaryKeyConstraint('uuid'),
+                    sa.UniqueConstraint('config_key', name=u'probe_uq_config_key')
+    )
+
+    # tempmon reading
+    op.create_table('reading',
+                    sa.Column('uuid', sa.String(length=32), nullable=False),
+                    sa.Column('client_uuid', sa.String(length=32), nullable=False),
+                    sa.Column('probe_uuid', sa.String(length=32), nullable=False),
+                    sa.Column('taken', sa.DateTime(), nullable=False),
+                    sa.Column('degrees_f', sa.Numeric(precision=7, scale=4), nullable=False),
+                    sa.ForeignKeyConstraint(['client_uuid'], [u'client.uuid'], name=u'reading_fk_client'),
+                    sa.ForeignKeyConstraint(['probe_uuid'], [u'probe.uuid'], name=u'reading_fk_probe'),
+                    sa.PrimaryKeyConstraint('uuid')
+    )
+
+
+def downgrade():
+    op.drop_table('reading')
+    op.drop_table('probe')
+    op.drop_table('client')

rattail_tempmon/db/model.py

@@ -0,0 +1,140 @@
+# -*- coding: utf-8 -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2016 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail 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.
+#
+#  Rattail 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 Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Data models for tempmon
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+import datetime
+
+import sqlalchemy as sa
+from sqlalchemy import orm
+from sqlalchemy.ext.declarative import declarative_base
+
+from rattail.db.model import uuid_column
+from rattail.db.model.core import ModelBase
+
+
+Base = declarative_base(cls=ModelBase)
+
+
+class Client(Base):
+    """
+    Represents a tempmon client.
+    """
+    __tablename__ = 'client'
+    __table_args__ = (
+        sa.UniqueConstraint('config_key', name='client_uq_config_key'),
+    )
+
+    uuid = uuid_column()
+    config_key = sa.Column(sa.String(length=50), nullable=False)
+    hostname = sa.Column(sa.String(length=255), nullable=False)
+    location = sa.Column(sa.String(length=255), nullable=True)
+    enabled = sa.Column(sa.Boolean(), nullable=False, default=False)
+    online = sa.Column(sa.Boolean(), nullable=False, default=False)
+
+    def __unicode__(self):
+        return '{} ({})'.format(self.config_key, self.hostname)
+
+    def enabled_probes(self):
+        return [probe for probe in self.probes if probe.enabled]
+
+
+class Probe(Base):
+    """
+    Represents a probe connected to a tempmon client.
+    """
+    __tablename__ = 'probe'
+    __table_args__ = (
+        sa.ForeignKeyConstraint(['client_uuid'], ['client.uuid'], name='probe_fk_client'),
+        sa.UniqueConstraint('config_key', name='probe_uq_config_key'),
+    )
+
+    uuid = uuid_column()
+    client_uuid = sa.Column(sa.String(length=32), nullable=False)
+
+    client = orm.relationship(
+        Client,
+        doc="""
+        Reference to the tempmon client to which this probe is connected.
+        """,
+        backref=orm.backref(
+            'probes',
+            doc="""
+            List of probes connected to this client.
+            """))
+
+    config_key = sa.Column(sa.String(length=50), nullable=False)
+    appliance_type = sa.Column(sa.Integer(), nullable=False)
+    description = sa.Column(sa.String(length=255), nullable=False)
+    device_path = sa.Column(sa.String(length=255), nullable=True)
+    enabled = sa.Column(sa.Boolean(), nullable=False, default=True)
+
+    good_temp_min = sa.Column(sa.Integer(), nullable=False)
+    good_temp_max = sa.Column(sa.Integer(), nullable=False)
+    critical_temp_min = sa.Column(sa.Integer(), nullable=False)
+    critical_temp_max = sa.Column(sa.Integer(), nullable=False)
+    therm_status_timeout = sa.Column(sa.Integer(), nullable=False)
+    status_alert_timeout = sa.Column(sa.Integer(), nullable=False)
+
+    status = sa.Column(sa.Integer(), nullable=True)
+    status_changed = sa.Column(sa.DateTime(), nullable=True)
+    status_alert_sent = sa.Column(sa.DateTime(), nullable=True)
+
+    def __unicode__(self):
+        return unicode(self.description or '')
+
+
+class Reading(Base):
+    """
+    Represents a single tempurate reading from a tempmon probe.
+    """
+    __tablename__ = 'reading'
+    __table_args__ = (
+        sa.ForeignKeyConstraint(['client_uuid'], ['client.uuid'], name='reading_fk_client'),
+        sa.ForeignKeyConstraint(['probe_uuid'], ['probe.uuid'], name='reading_fk_probe'),
+    )
+
+    uuid = uuid_column()
+
+    client_uuid = sa.Column(sa.String(length=32), nullable=False)
+    client = orm.relationship(
+        Client,
+        doc="""
+        Reference to the tempmon client which took this reading.
+        """)
+
+    probe_uuid = sa.Column(sa.String(length=32), nullable=False)
+    probe = orm.relationship(
+        Probe,
+        doc="""
+        Reference to the tempmon probe which took this reading.
+        """)
+
+    taken = sa.Column(sa.DateTime(), nullable=False, default=datetime.datetime.utcnow)
+    degrees_f = sa.Column(sa.Numeric(precision=7, scale=4), nullable=False)
+
+    def __unicode__(self):
+        return unicode(self.degrees_f)

rattail_tempmon/server.py

@@ -0,0 +1,161 @@
+# -*- coding: utf-8 -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2016 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail 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.
+#
+#  Rattail 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 Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Tempmon server daemon
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+import time
+import datetime
+import logging
+
+from rattail.db import Session, api
+from rattail_tempmon import Session as TempmonSession
+from rattail.daemon import Daemon
+from rattail.time import localtime, make_utc
+from rattail.mail import send_email
+
+
+log = logging.getLogger(__name__)
+
+
+class TempmonServerDaemon(Daemon):
+    """
+    Linux daemon implementation of tempmon server.
+    """
+    timefmt = '%Y-%m-%d %H:%M:%S'
+
+    def run(self):
+        """
+        Keeps an eye on tempmon readings and sends alerts as needed.
+        """
+        self.extra_emails = self.config.getlist('rattail.tempmon', 'extra_emails', default=[])
+        while True:
+            self.check_readings()
+            time.sleep(5)
+
+    def check_readings(self):
+        self.now = make_utc()
+        session = TempmonSession()
+        probes = session.query(tempmon.Probe)\
+                        .join(tempmon.Client)\
+                        .filter(tempmon.Client.enabled == True)\
+                        .filter(tempmon.Probe.enabled == True)\
+                        .all()
+
+        if probes:
+            cutoff = self.now - datetime.timedelta(seconds=120)
+            uuids = [probe.uuid for probe in probes]
+            readings = session.query(tempmon.Reading)\
+                              .filter(tempmon.Reading.probe_uuid.in_(uuids))\
+                              .filter(tempmon.Reading.taken >= cutoff)\
+                              .all()
+            self.process_readings(probes, readings)
+
+        else:
+            log.warning("found no enabled probes!")
+
+        session.commit()
+        session.close()
+
+        # TODO: not sure this is really necessary?
+        self.set_last_checked()
+
+    def process_readings(self, probes, readings):
+        for probe in probes:
+            probe_readings = [r for r in readings if r.probe is probe]
+            if probe_readings:
+                reading = sorted(probe_readings, key=lambda r: r.taken)[-1]
+
+                if (reading.degrees_f <= probe.critical_temp_min or
+                      reading.degrees_f >= probe.critical_temp_max):
+                    self.update_status(probe, self.enum.TEMPMON_PROBE_STATUS_CRITICAL_TEMP, reading)
+
+                elif reading.degrees_f < probe.good_temp_min:
+                    self.update_status(probe, self.enum.TEMPMON_PROBE_STATUS_LOW_TEMP, reading)
+
+                elif reading.degrees_f > probe.good_temp_max:
+                    self.update_status(probe, self.enum.TEMPMON_PROBE_STATUS_HIGH_TEMP, reading)
+
+                else: # temp is good
+                    self.update_status(probe, self.enum.TEMPMON_PROBE_STATUS_GOOD_TEMP, reading)
+                
+            else: # no readings for probe
+                self.update_status(probe, self.enum.TEMPMON_PROBE_STATUS_ERROR)
+
+    def update_status(self, probe, status, reading=None):
+        prev_status = probe.status
+        if probe.status != status:
+            probe.status = status
+            probe.status_changed = self.now
+            probe.status_alert_sent = None
+
+        # no email if status is good
+        if status == self.enum.TEMPMON_PROBE_STATUS_GOOD_TEMP:
+            return
+
+        # no email if we already sent one...until timeout is reached
+        if probe.status_alert_sent:
+            timeout = datetime.timedelta(minutes=probe.status_alert_timeout)
+            if (self.now - probe.status_alert_sent) <= timeout:
+                return
+
+        msgtypes = {
+            self.enum.TEMPMON_PROBE_STATUS_LOW_TEMP             : 'tempmon_low_temp',
+            self.enum.TEMPMON_PROBE_STATUS_HIGH_TEMP            : 'tempmon_high_temp',
+            self.enum.TEMPMON_PROBE_STATUS_CRITICAL_TEMP        : 'tempmon_critical_temp',
+            self.enum.TEMPMON_PROBE_STATUS_ERROR                : 'tempmon_error',
+        }
+
+        data = {
+            'probe': probe,
+            'status': self.enum.TEMPMON_PROBE_STATUS[status],
+            'reading': reading,
+            'taken': localtime(self.config, make_utc(reading.taken, tzinfo=True)) if reading else None,
+            'now': localtime(self.config),
+        }
+
+        send_email(self.config, msgtypes[status], data)
+
+        # maybe send more emails if config said so
+        for msgtype in self.extra_emails:
+            send_email(self.config, msgtype, data)
+
+        probe.status_alert_sent = self.now
+
+    def set_last_checked(self):
+        session = Session()
+        api.save_setting(session, 'tempmon.server.last_checked', self.now.strftime(self.timefmt))
+        session.commit()
+        session.close()
+
+
+def make_daemon(config, pidfile=None):
+    """
+    Returns a tempmon server daemon instance.
+    """
+    if not pidfile:
+        pidfile = config.get('rattail.tempmon', 'server.pid_path',
+                             default='/var/run/rattail/tempmon-server.pid')
+    return TempmonServerDaemon(pidfile, config=config)