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temp_log.py
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temp_log.py
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import config
from flask import Flask
import flask_sqlalchemy
sa = flask_sqlalchemy.sqlalchemy
db = flask_sqlalchemy.SQLAlchemy()
import string
from itertools import islice
from datetime import datetime
class SensTable(object):
def __init__(self):
pass
def __len__(self):
cnt = self.fridge_table().count()
return db.session.execute(cnt).first()[0]
def __getitem__(self, key):
if isinstance(key, slice):
if (key.start is not None and not isinstance(key.start, int)) \
or (key.stop is not None and not isinstance(key.stop, int)):
raise TypeError('Start and end indices must be numeric')
start = key.start
stop = key.stop
step = key.step if key.step else 1
if step < 0:
raise ValueError("Negative step sizes are not supported")
limit = None
reverse = False
if start is None:
if stop is None:
return self[0::step]
if stop < 0:
count = len(self)
stop = count+stop-1
return self[0:stop:step]
elif start < 0:
if stop is not None:
count = len(self)
start = count+start
if stop < 0:
stop = count+stop-1
return self[start:stop:step]
# Otherwise select in reverse order and swap order in python
res = self.fridge_table().select(limit=abs(start))
res = res.order_by(self.fridge_table().c.Time.desc())
reverse = True
else: # start > 0
if stop is None:
pass # This is the same as limit=None
elif stop < 0:
count = len(self)
stop = count+stop-1
return self[start:stop:step]
else:
limit = stop-start
if limit < 0:
return iter(())
res = self.fridge_table().select(offset=start, limit=limit)
res = res.order_by(self.fridge_table().c.Time.asc())
res = db.session.execute(res)
if reverse:
res = reversed(tuple(res))
return islice(res, None, None, step)
elif isinstance(key, int):
if key < 0:
offset = abs(key) - 1
else:
offset = key
res = self.fridge_table().select(offset=offset, limit=1)
if key >= 0:
res = res.order_by(self.fridge_table().c.Time.asc())
else:
res = res.order_by(self.fridge_table().c.Time.desc())
res = db.session.execute(res)
res = res.first()
if res is None:
raise KeyError("Index out of range")
return res
else:
raise TypeError('List indices must be int')
def __setitem__(self, key, value):
if not isinstance(key, int):
raise TypeError('List index must be int')
if key < 0:
key = len(self)+key
if key >= len(self):
raise IndexError('List index out of range')
res = self[key]
stmt = self.fridge_table().update().where(self.fridge_table().c.Time==res['Time']).values(**value)
db.session.execute(stmt)
db.session.commit()
def __delitem__(self, key):
items = self[key]
if isinstance(key, int):
items = [items]
items = list(items)
for i in items:
stmt = self.fridge_table().delete().where(self.fridge_table().c.Time==i['Time'])
db.session.execute(stmt)
db.session.commit()
def __iter__(self):
return iter(self[:])
def __reversed__(self):
return iter(self[::-1])
def append(self, **values):
if "Time" in values:
time = values["Time"]
del values["Time"]
else:
time = datetime.now()
try:
ins = self.fridge_table().insert().values(Time=time, **values)
db.session.execute(ins)
db.session.commit()
except sa.exc.CompileError:
raise KeyError("Invalid column name")
except sa.exc.IntegrityError:
# This occurs if we try and add a duplicate timestamp
# We can fail quietly here
return False
def remove(self):
stmt = self.fridge_table().delete().where(fridge.table().c.Time == i['Time'])
db.session.execute(stmt)
db.session.commit()
def hourly_avg(self, sensor):
columns = self.fridge_table().columns
dategroup = sa.func.date_trunc('hour', sa.func.timezone('UTC', columns.Time)).label("Time")
dategroup.type = sa.DateTime()
if sensor not in columns:
raise KeyError("Sensor not found")
sensor_c = sa.func.avg(columns[sensor]).label(sensor)
query = sa.select((dategroup, sensor_c)).group_by(dategroup).order_by(dategroup.asc())
return db.session.execute(query)
def range(self, start, stop):
query = self.fridge_table().select().where(self.fridge_table().columns.Time.between(start, stop)).order_by(self.fridge_table().columns.Time.asc())
return db.session.execute(query)
class SensorMeta(flask_sqlalchemy.DefaultMeta, sa.sql.visitors.VisitableType):
pass
class Sensors(db.Model, db.Column, metaclass=SensorMeta):
id = db.Column(db.Integer(), primary_key=True)
fridge_id = db.Column(db.Integer(), db.ForeignKey('Fridges.id'))
column_name = db.Column(db.String(1024))
display_name = db.Column("name", db.String(1024))
view_order = db.Column(db.Integer())
visible = db.Column(db.Integer())
__tablename__ = "Sensors"
def __init__(self, display_name, column_name, fridge, view_order=1, visible=1):
if isinstance(fridge, Fridges):
self.fridge_id = fridge.id
else:
self.fridge_id = int(fridge)
self.display_name = display_name
self.column_name = column_name
self.view_order = view_order
self.visible = visible
db.Column.__init__(self, column_name, db.Float)
def __repr__(self):
return "<Sensor %r>" % (self.display_name)
@classmethod
def get_sensor(cls, name, fridge, add=False):
if isinstance(fridge, Fridges):
fridge_id = fridge.id
else:
fridge_id = int(fridge)
sensor = cls.query.filter_by(column_name=name, fridge_id=fridge_id)
if sensor.count() == 0 and add:
safe_name = name.replace(' ', '_')
sensor = Sensors(name, safe_name, fridge)
db.session.add(sensor)
return sensor
elif sensor.count() == 0 and not add:
raise KeyError("Sensor not found")
return sensor.first()
class Sensors_Supplementary(db.Model):
id = db.Column(db.Integer(), primary_key=True)
fridge_suppl_id = db.Column(db.Integer(), db.ForeignKey('Fridges_Supplementary.id'))
column_name = db.Column(db.String(1024))
display_name = db.Column("name", db.String(1024))
view_order = db.Column(db.Integer())
visible = db.Column(db.Integer())
__tablename__ = "Sensors_Supplementary"
def __init__(self, name, fridge_suppl, column_name=None, view_order=1, visible=1):
if isinstance(fridge_suppl, Fridges_Supplementary):
self.fridge_suppl_id = fridge_suppl.id
else:
self.fridge_suppl_id = int(fridge_suppl)
self.column_name = name
if column_name:
self.column_name = column_name
else:
self.column_name = name
self.view_order = view_order
self.visible = visible
def __repr__(self):
return "<Supplementary_Sensor %r>" % (self.column_name)
@classmethod
def get_sensor(cls, name, fridge, add=False):
if isinstance(fridge, Fridges_Supplementary):
suppl_id = fridge.id
else:
suppl_id = int(fridge)
sensor = cls.query.filter_by(column_name=name, fridge_suppl_id=suppl_id)
if sensor.count() == 0 and add:
sensor = Sensors_Supplementary(name, fridge, name)
db.session.add(sensor)
return sensor
elif sensor.count() == 0 and not add:
raise KeyError("Unknown Sensor")
return sensor.first()
class Fridges_Supplementary(db.Model, SensTable):
id = db.Column(db.Integer(), primary_key=True)
fridge_id = db.Column(db.Integer(), db.ForeignKey('Fridges.id'))
table_name = db.Column(db.String(1024))
name = db.Column(db.String(1024))
label = db.Column(db.String(1024))
comment = db.Column(db.UnicodeText())
sensors = db.relationship('Sensors_Supplementary', backref='fridge_suppl', lazy='dynamic')
__tablename__ = "Fridges_Supplementary"
def __init__(self, name, table_name, label, sensors, comment=None):
self.table_name = table_name
self.name = name
self.label = label
for sensor in sensors:
self.sensors.append(Sensors_Supplementary.get_sensor(sensor, self, True))
self.comment = comment
def get_sensor(self, sensor):
return Sensors_Supplementary.get_sensor(sensor, self, False)
def __repr__(self):
return "<Supplementary for %r: %r>" % (self.fridge, self.table_name)
def fridge_table(self):
# Sanitize name by replacing all spacial characters
if self.table_name in db.metadata.tables:
return db.metadata.tables[self.table_name]
elif not hasattr(self, '_suppl_table') or self._suppl_table is None:
self._suppl_table = db.Table(self.table_name, db.metadata,
db.Column('Time', db.TIMESTAMP, primary_key=True),
*[db.Column(sensor.column_name, db.Float) for sensor in self.sensors])
return self._suppl_table
class Fridges(db.Model, SensTable):
id = db.Column(db.Integer(), primary_key=True)
name = db.Column(db.String(255), unique=True)
comment = db.Column(db.UnicodeText())
sensors = db.relationship('Sensors', backref='fridge', lazy='dynamic')
supplementary = db.relationship('Fridges_Supplementary', backref='fridge', lazy='dynamic')
__tablename__ = "Fridges"
# Cache of existing table definitions
__tables__ = {}
def __init__(self, name, sensors, comment=None):
self.name = name
for sensor in sensors:
self.sensors.append(Sensors.get_sensor(sensor, self, True))
self.comment = comment if comment is not None else ""
self._fridge_table = None
def __repr__(self):
return "<Fridge %r>" % self.name
def get_sensor(self, sensor):
return Sensors.get_sensor(sensor, self, False)
def fridge_table(self):
# Sanitize name by replacing all spacial characters
name = "".join(c if c in string.ascii_letters+string.digits else "_" for c in self.name)
if name in db.metadata.tables:
return db.metadata.tables[name]
elif not hasattr(self, '_fridge_table') or self._fridge_table is None:
self._fridge_table = db.Table(name, db.metadata,
db.Column('Time', db.TIMESTAMP, primary_key=True),
*[db.Column(sensor.column_name, db.Float) for sensor in self.sensors])
return self._fridge_table
@classmethod
def get_fridge(cls, name):
# Sanitize name by replacing all spacial characters
name = "".join(c if c in string.ascii_letters+string.digits else " " for c in name)
res = Fridges.query.filter(Fridges.name==name).first()
if res is None:
raise KeyError("Unable to find fridge")
return res
if __name__ == "__main__":
from app import app
# Bind db
db.app = app
db.init_app(app)
# Bootstrap table and data creation
db.create_all()
# Generate a default list of fridges, and thermometers on those fridges
thermometers = ["MC_PT", "MC_Speer", "50mK_RuO", "Still_RuO", "4K_RuO"]
fridges = ["Big_Fridge"]
fridge_models = []
# Create tables for those fridges
for fridge in fridges:
fridge_model = Fridges(name=fridge, sensors=thermometers)
fridge_table = fridge_model.fridge_table()
fridge_models.append(fridge_model)
# Then, create all the new tables
db.create_all()
# And finally, add all models
for fridge in fridge_models:
db.session.add(fridge)
db.session.commit()