Add basic tempmon-client command

hotcooler/tempmon/client.py

@@ -0,0 +1,139 @@
+"""
+Tempmon Client
+
+Responsible for reading temperatures from probes, and recording to database
+"""
+
+import sys
+import argparse
+import time
+import datetime
+import random
+import socket
+import logging
+
+from sqlalchemy.orm.exc import NoResultFound
+
+from websauna.system.devop.cmdline import init_websauna
+
+from hotcooler import models
+
+
+log = logging.getLogger(__name__)
+
+
+class TempmonClient:
+    """
+    Linux daemon implementation of Tempmon client
+    """
+    # must set this to a sessionmaker
+    Session = None
+
+    def run(self):
+        """
+        This method is invoked upon daemon startup.  It is meant to run/loop
+        "forever" or until daemon stop.
+        """
+        # maybe generate random data instead of reading from true probe
+        # self.dummy_probes = self.config.getbool('tempmon.client', 'dummy_probes', default=False)
+        self.dummy_probes = True # TODO
+
+        # figure out which client we are
+        # hostname = self.config.get('tempmon.client', 'hostname', default=socket.gethostname())
+        hostname = 'demo.rattail-tempmon.org' # TODO
+        session = self.Session()
+        try:
+            client = session.query(models.Client)\
+                            .filter_by(hostname=hostname)\
+                            .one()
+        except NoResultFound:
+            session.close()
+            raise RuntimeError("No tempmon client configured for hostname: {}".format(hostname))
+        client_uuid = client.uuid
+        self.delay = client.delay or 60
+        session.close()
+
+        # main loop: take readings, pause, repeat
+        while True:
+
+            session = self.Session()
+
+            try:
+                client = session.query(models.Client).filter_by(uuid=client_uuid).one()
+                self.delay = client.delay or 60
+                if client.enabled:
+                    for probe in client.enabled_probes():
+                        self.take_reading(session, probe)
+
+            except:
+                log.exception("Failed to read/record temperature data (but will keep trying)")
+                session.rollback()
+
+            else:
+                # make sure we show as being online
+                if not client.online:
+                    client.online = True
+                session.commit()
+
+            finally:
+                session.close()
+
+            time.sleep(self.delay)
+
+    def take_reading(self, session, probe):
+        """
+        Take a single reading and add to Rattail database.
+        """
+        reading = models.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
+        """
+        if self.dummy_probes:
+            return self.random_temp(probe)
+        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 random_temp(self, probe):
+        temp = random.uniform(probe.critical_temp_min - 5, probe.critical_temp_max + 5)
+        return round(temp, 4)
+
+
+def tempmon_client_command(*args):
+    """
+    Manage the hotcooler tempmon-client daemon
+    """
+    parser = argparse.ArgumentParser(prog='tempmon-client',
+                                     description=tempmon_client_command.__doc__.strip())
+
+    parser.add_argument('config_uri', help="Path to main config file")
+
+    args = parser.parse_args(args or sys.argv[1:])
+    request = init_websauna(args.config_uri, console_app=True)
+    session = request.dbsession
+
+    client = TempmonClient()
+    client.Session = request.registry.db_session_maker
+    client.run()

setup.py

@@ -18,7 +18,8 @@ if len(sys.argv) >= 2:
         raise RuntimeError("It is not possible to install this package with setup.py. Use pip to install this package as instructed in Websauna tutorial.")
 
 
-setup(name='hotcooler',
+setup(
+    name='hotcooler',
     version='0.0',
     description='hotcooler',
     long_description=README + '\n\n' + CHANGES,
@@ -55,9 +56,12 @@ setup(name='hotcooler',
         'dev': ['websauna[dev]'],
     },
 
-      # Define where this application starts as referred by WSGI web servers
-      entry_points="""\
-      [paste.app_factory]
-      main = hotcooler:main
-      """,
+    entry_points = {
+        'paste.app_factory': [
+            'main = hotcooler:main',
+        ],
+        'console_scripts': [
+            'tempmon-client = hotcooler.tempmon.client:tempmon_client_command',
+        ],
+    },
 )