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webgui.py
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webgui.py
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#!/usr/bin/env python
import sqlite3
import sys
import cgi
import cgitb
# global variables
speriod=(15*60)-1
dbname='/var/www/templog.db'
# print the HTTP header
def printHTTPheader():
print "Content-type: text/html\n\n"
# print the HTML head section
# arguments are the page title and the table for the chart
def printHTMLHead(title, table):
print "<head>"
print " <title>"
print title
print " </title>"
print_graph_script(table)
print "</head>"
# get data from the database
# if an interval is passed,
# return a list of records from the database
def get_data(interval):
conn=sqlite3.connect(dbname)
curs=conn.cursor()
if interval == None:
curs.execute("SELECT * FROM temps")
else:
curs.execute("SELECT * FROM temps WHERE timestamp>datetime('now','-%s hours')" % interval)
rows=curs.fetchall()
conn.close()
return rows
# convert rows from database into a javascript table
def create_table(rows):
chart_table=""
for row in rows[:-1]:
rowstr="['{0}', {1}],\n".format(str(row[0]),str(row[1]))
chart_table+=rowstr
row=rows[-1]
rowstr="['{0}', {1}]\n".format(str(row[0]),str(row[1]))
chart_table+=rowstr
return chart_table
# print the javascript to generate the chart
# pass the table generated from the database info
def print_graph_script(table):
# google chart snippet
chart_code="""
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("visualization", "1", {packages:["corechart"]});
google.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable([
['Time', 'Temperature'],
%s
]);
var options = {
title: 'Temperature'
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>"""
print chart_code % (table)
# print the div that contains the graph
def show_graph():
print "<h2>Temperature Chart</h2>"
print '<div id="chart_div" style="width: 900px; height: 500px;"></div>'
# connect to the db and show some stats
# argument option is the number of hours
def show_stats(option):
conn=sqlite3.connect(dbname)
curs=conn.cursor()
if option is None:
option = str(730)
curs.execute("SELECT timestamp,max(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
rowmax=curs.fetchone()
rowstrmax="{0}   {1}C".format(str(rowmax[0]),str(rowmax[1]))
curs.execute("SELECT timestamp,min(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
rowmin=curs.fetchone()
rowstrmin="{0}   {1}C".format(str(rowmin[0]),str(rowmin[1]))
curs.execute("SELECT avg(temp) FROM temps WHERE timestamp>datetime('now','-%s hour') AND timestamp<=datetime('now')" % option)
rowavg=curs.fetchone()
print "<hr>"
print "<h2>Miniumum temperature</h2>"
print rowstrmin
print "<h2>Maximum temperature</h2>"
print rowstrmax
print "<h2>Average temperature</h2>"
print "%.3f" % rowavg+"C"
print "<hr>"
# print "<h2>In the last hour:</h2>"
# print "<table>"
# print "<tr><td><strong>Date/Time</strong></td><td><strong>Temperature</strong></td></tr>"
# rows=curs.execute("SELECT * FROM temps WHERE timestamp>datetime('new','-1 hour') AND timestamp<=datetime('new')")
# rows=curs.execute("SELECT * FROM temps WHERE timestamp>datetime('2013-09-19 21:30:02','-1 hour') AND timestamp<=datetime('2013-09-19 21:31:02')")
# for row in rows:
# rowstr="<tr><td>{0}  </td><td>{1}C</td></tr>".format(str(row[0]),str(row[1]))
# print rowstr
# print "</table>"
# print "<hr>"
conn.close()
def print_time_selector(option):
print """<form action="/cgi-bin/webgui.py" method="POST">
Show the temperature logs for
<select name="timeinterval">"""
if option is not None:
if option == "730":
print "<option value=\"730\" selected=\"selected\">the last month</option>"
else:
print "<option value=\"730\">the last month</option>"
if option == "168":
print "<option value=\"168\" selected=\"selected\">the last week</option>"
else:
print "<option value=\"168\">the last week</option>"
if option == "24":
print "<option value=\"24\" selected=\"selected\">the last day</option>"
else:
print "<option value=\"24\">the last day</option>"
else:
print """<option value="168">the last week</option>
<option value="730">the last month</option>
<option value="24" selected="selected">the last day</option>"""
print """ </select>
<input type="submit" value="Display">
</form>"""
# check that the option is valid
# and not an SQL injection
def validate_input(option_str):
# check that the option string represents a number
if option_str.isalnum():
# check that the option is within a specific range
if int(option_str) > 0 and int(option_str) <= 730:
return option_str
else:
return None
else:
return None
#return the option passed to the script
def get_option():
form=cgi.FieldStorage()
if "timeinterval" in form:
option = form["timeinterval"].value
return validate_input (option)
else:
return None
# main function
# This is where the program starts
def main():
cgitb.enable()
# get options that may have been passed to this script
option=get_option()
if option is None:
option = str(24)
# get data from the database
records=get_data(option)
# print the HTTP header
printHTTPheader()
if len(records) != 0:
# convert the data into a table
table=create_table(records)
else:
print "No data found"
return
# start printing the page
print "<html>"
# print the head section including the table
# used by the javascript for the chart
printHTMLHead("Raspberry Pi Temperature Logger", table)
# print the page body
print "<body>"
print "<h1>Raspberry Pi Temperature Logger</h1>"
print "<hr>"
print_time_selector(option)
show_graph()
show_stats(option)
print "<link rel=\"stylesheet\" href=\"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css\" integrity=\"sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u\" crossorigin=\"anonymous\">"
print "<script src=\"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js\" integrity=\"sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa\" crossorigin=\"anonymous\"></script>"
print "<link rel=\"stylesheet\" href=\"https://maxcdn.bootstrapcdn.com/bootswatch/3.3.7/flatly/bootstrap.min.css\">"
print "</body>"
print "</html>"
sys.stdout.flush()
if __name__=="__main__":
main()