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import sqlite3
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from genshi.template import TemplateLoader
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from genshi.template.base import Context
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DB_PATH = '/home/dsorber/bcfs/beer_temps.db'
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# It accepts two arguments:
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# environ points to a dictionary containing CGI like environment variables
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# which is filled by the server for each received request from the client
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# start_response is a callback function supplied by the server
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# which will be used to send the HTTP status and headers to the server
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def application(environ, start_response):
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loader = TemplateLoader('/home/dsorber/bcfs/templates',
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auto_reload=True)
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# Testing purposes only -- REMOVE BEFORE SHIPPING
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response_body = 'The environ dict: %s' % environ['PATH_INFO']
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if not environ['PATH_INFO']:
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# Load the index template
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template = loader.load('index.html')
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# Create the response args
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response_args = {'title': 'Beer Fermentation Control System'}
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# Open up the connection to the database, execute the query,
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# grab the results, then close the DB connection.
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db_conn = sqlite3.connect(DB_PATH)
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db = db_conn.cursor()
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db.execute("select strftime('%m/%d/%Y', date(ts, 'unixepoch')), "
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" count(ts), avg(temp1), max(temp1), min(temp1),"
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" avg(temp2), max(temp2), min(temp2), avg(temp3),"
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" max(temp3), min(temp3), avg(temp4), max(temp4),"
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" min(temp4)"
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"from temp_data "
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"group by date(ts, 'unixepoch')")
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response_args['results'] = db.fetchall()
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db_conn.close()
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# Generate the stream and then render it to HTML
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stream = template.generate(**response_args)
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response_body = stream.render('html', doctype='html')
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# Set the appropriate response headers
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response_headers = [('Content-Type', 'text/html'),
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('Content-Length', str(len(response_body)))]
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elif environ['PATH_INFO'].startswith('/day/'):
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# Load the day template
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template = loader.load('day.html')
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day = environ['PATH_INFO'][5:7]
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month = environ['PATH_INFO'][7:9]
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year = environ['PATH_INFO'][9:13]
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date = '%s/%s/%s' % (month, day, year)
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# Create the response args
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response_args = {'title': 'Sensor Readings for %s' % date}
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# Open up the connection to the database, execute the query,
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# grab the results, then close the DB connection.
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db_conn = sqlite3.connect(DB_PATH)
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db = db_conn.cursor()
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db.execute("select strftime('%m/%d/%Y %H:%M:%S', ts, 'unixepoch'), "
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" temp1, temp2, temp3, temp4, relay_status "
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"from temp_data "
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"where date(ts, 'unixepoch') is date('2013-04-22')"
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"order by ts desc")
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response_args['results'] = db.fetchall()
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db_conn.close()
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# Generate the stream and then render it to HTML
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stream = template.generate(**response_args)
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response_body = stream.render('html', doctype='html')
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# Set the appropriate response headers
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response_headers = [('Content-Type', 'text/html'),
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('Content-Length', str(len(response_body)))]
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else:
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# User supplied an invalid URL
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response_body = 'Invalid URL "%s"' % environ['PATH_INFO']
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response_headers = [('Content-Type', 'text/plain'),
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('Content-Length', str(len(response_body)))]
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# HTTP response code and message
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status = '200 OK'
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# Send the status and response headers to the server
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start_response(status, response_headers)
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# Return the response body. (Notice it is wrapped in a list although it
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# could be any iterable.)
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return [response_body]
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