Add appliance table, and probe "location" in that context

rattail_tempmon/db/alembic/versions/796084026e5b_add_appliance.py

@@ -0,0 +1,49 @@
+# -*- coding: utf-8; -*-
+"""add appliance
+
+Revision ID: 796084026e5b
+Revises: b02c531caca5
+Create Date: 2018-10-19 17:28:34.146307
+
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+# revision identifiers, used by Alembic.
+revision = '796084026e5b'
+down_revision = u'b02c531caca5'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+import rattail.db.types
+
+
+
+def upgrade():
+
+    # appliance
+    op.create_table('appliance',
+                    sa.Column('uuid', sa.String(length=32), nullable=False),
+                    sa.Column('name', sa.String(length=255), nullable=False),
+                    sa.Column('location', sa.String(length=255), nullable=True),
+                    sa.PrimaryKeyConstraint('uuid'),
+                    sa.UniqueConstraint('name', name=u'appliance_uq_name')
+    )
+
+    # probe
+    op.add_column(u'probe', sa.Column('appliance_uuid', sa.String(length=32), nullable=True))
+    op.add_column(u'probe', sa.Column('location', sa.String(length=255), nullable=True))
+    op.create_foreign_key(u'probe_fk_appliance', 'probe', 'appliance', ['appliance_uuid'], ['uuid'])
+
+
+def downgrade():
+
+    # probe
+    op.drop_constraint(u'probe_fk_appliance', 'probe', type_='foreignkey')
+    op.drop_column(u'probe', 'location')
+    op.drop_column(u'probe', 'appliance_uuid')
+
+    # appliance
+    op.drop_table('appliance')

rattail_tempmon/db/model.py

@@ -41,6 +41,30 @@ from rattail.db.model.core import ModelBase
 Base = declarative_base(cls=ModelBase)
 
 
+@six.python_2_unicode_compatible
+class Appliance(Base):
+    """
+    Represents an appliance which is monitored by tempmon.
+    """
+    __tablename__ = 'appliance'
+    __table_args__ = (
+        sa.UniqueConstraint('name', name='appliance_uq_name'),
+    )
+
+    uuid = uuid_column()
+
+    name = sa.Column(sa.String(length=255), nullable=False, doc="""
+    Human-friendly (and unique) name for the appliance.
+    """)
+
+    location = sa.Column(sa.String(length=255), nullable=True, doc="""
+    Description of the appliance's physical location.
+    """)
+
+    def __str__(self):
+        return self.name
+
+
 @six.python_2_unicode_compatible
 class Client(Base):
     """
@@ -107,6 +131,7 @@ class Probe(Base):
     __tablename__ = 'probe'
     __table_args__ = (
         sa.ForeignKeyConstraint(['client_uuid'], ['client.uuid'], name='probe_fk_client'),
+        sa.ForeignKeyConstraint(['appliance_uuid'], ['appliance.uuid'], name='probe_fk_appliance'),
         sa.UniqueConstraint('config_key', name='probe_uq_config_key'),
     )
 
@@ -126,8 +151,29 @@ class Probe(Base):
             """))
 
     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)
+
+    appliance_uuid = sa.Column(sa.String(length=32), nullable=True)
+    appliance = orm.relationship(
+        Appliance,
+        doc="""
+        Reference to the appliance which this probe monitors.
+        """,
+        backref=orm.backref(
+            'probes',
+            doc="""
+            List of probes which monitor this appliance.
+            """))
+
+    description = sa.Column(sa.String(length=255), nullable=False, doc="""
+    General human-friendly description for the probe.
+    """)
+
+    location = sa.Column(sa.String(length=255), nullable=True, doc="""
+    Description of the probe's physical location, relative to the appliance.
+    """)
+
     device_path = sa.Column(sa.String(length=255), nullable=True)
     enabled = sa.Column(sa.Boolean(), nullable=False, default=True)