annotate web/log.py @ 45:425af63d584d

merge
author Matt Johnston <matt@ucc.asn.au>
date Sat, 23 Jun 2012 23:37:36 +0800
parents 96c336896201 ea99aae87884
children 206294a354a7
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1 #:vim:et:ts=4:sts=4:sw=4:
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2 import rrdtool
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3 import os
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4 import os.path
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5 import sys
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6 import glob
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7 import hashlib
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8 import tempfile
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9 import time
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10 import syslog
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11 import sqlite3
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12 from colorsys import hls_to_rgb
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13
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14 import config
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15
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16 def sensor_rrd_path(s):
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17 return '%s/sensor_%s.rrd' % (config.DATA_PATH, s)
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18
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19 # returns (path, sensor_name) tuples
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20 def all_sensors():
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21 return [(r, os.path.basename(r[:-4]))
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22 for r in glob.glob('%s/*.rrd' % config.DATA_PATH)]
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23
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24 def create_rrd(sensor_id):
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25 # start date of 10 seconds into 1970 is used so that we can
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26 # update with prior values straight away.
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27 args = [sensor_rrd_path(sensor_id),
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28 '--start', '10',
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29 '--step', '300',
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30 'DS:temp:GAUGE:600:-10:100',
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31 'RRA:AVERAGE:0.5:1:1051200']
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32
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33 rrdtool.create(*args)
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34
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35 # stolen from viewmtn, stolen from monotone-viz
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36 def colour_from_string(str):
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37 def f(off):
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38 return ord(hashval[off]) / 256.0
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39 hashval = hashlib.sha1(str).digest()
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40 hue = f(5)
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41 li = f(1) * 0.15 + 0.55
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42 sat = f(2) * 0.5 + .5
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43 return ''.join(["%.2x" % int(x * 256) for x in hls_to_rgb(hue, li, sat)])
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45 def graph_png(start, length):
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46 rrds = all_sensors()
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47
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48 graph_args = []
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49 for n, (rrdfile, sensor) in enumerate(rrds):
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50 vname = 'temp%d' % n
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51 graph_args.append('DEF:%(vname)s=%(rrdfile)s:temp:AVERAGE' % locals())
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52 width = config.LINE_WIDTH
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53 legend = config.SENSOR_NAMES.get(sensor, sensor)
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54 colour = config.SENSOR_COLOURS.get(legend, colour_from_string(sensor))
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55 graph_args.append('LINE%(width)f:%(vname)s#%(colour)s:%(legend)s' % locals())
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56
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57 tempf = tempfile.NamedTemporaryFile()
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58 args = [tempf.name, '-s', str(int(start)),
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59 '-e', str(int(start+length)),
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60 '-w', str(config.GRAPH_WIDTH),
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61 '-h', str(config.GRAPH_HEIGHT),
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62 '--slope-mode',
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63 '--border', '0',
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64 '--color', 'BACK#ffffff',
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65 '--alt-y-grid',
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66 '--imgformat', 'PNG'] \
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67 + graph_args
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68 if config.GRAPH_FONT:
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69 args += ['--font', 'DEFAULT:0:%s' % config.GRAPH_FONT]
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70 print>>sys.stderr, args
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71 rrdtool.graph(*args)
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72 return tempf.read()
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73
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74 def sensor_update(sensor_id, measurements, first_real_time, time_step):
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75 try:
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76 open(sensor_rrd_path(sensor_id))
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77 except IOError, e:
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78 create_rrd(sensor_id)
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79
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80 print>>sys.stderr, sensor_id, measurements, first_real_time, time_step
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81
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82 if measurements:
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83 values = ['%d:%f' % p for p in
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84 zip((first_real_time + time_step*t for t in xrange(len(measurements))),
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85 measurements)]
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86
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87 rrdfile = sensor_rrd_path(sensor_id)
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88 print>>sys.stderr, values
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89 # XXX what to do here when it fails...
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90 rrdtool.update(rrdfile, *values)
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91
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92 # be paranoid
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93 f = file(rrdfile)
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94 os.fsync(f.fileno())
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95
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96 def record_debug(lines):
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97 f = open('%s/debug.log' % config.DATA_PATH, 'a+')
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98 f.write('===== %s =====\n' % time.strftime('%a, %d %b %Y %H:%M:%S'))
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99 f.writelines(('%s\n' % s for s in lines))
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100 f.flush()
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101 return f
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102
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103 def parse(lines):
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104
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105 debugf = record_debug(lines)
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106
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107 entries = dict(l.split('=', 1) for l in lines)
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108 if len(entries) != len(lines):
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109 raise Exception("Keys are not unique")
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110
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111 num_sensors = int(entries['sensors'])
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112 num_measurements = int(entries['measurements'])
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113
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114 sensors = [entries['sensor_id%d' % n] for n in xrange(num_sensors)]
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115
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116 meas = []
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117 for s in sensors:
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118 meas.append([])
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119
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120 def val_scale(v):
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121 # convert decidegrees to degrees
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122 return 0.1 * v
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123
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124 for n in xrange(num_measurements):
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125 vals = [val_scale(int(x)) for x in entries["meas%d" % n].strip().split()]
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126 if len(vals) != num_sensors:
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127 raise Exception("Wrong number of sensors for measurement %d" % n)
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128 # we make an array of values for each sensor
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129 for s in xrange(num_sensors):
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130 meas[s].append(vals[s])
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131
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132 avr_now = float(entries['now'])
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133 avr_first_time = float(entries['first_time'])
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134 time_step = float(entries['time_step'])
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135
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136 #sqlite
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137 # - time
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138 # - voltage
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139 # - boot time
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140
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141 first_real_time = time.time() - (avr_now - avr_first_time)
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142
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143 for sensor_id, measurements in zip(sensors, meas):
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144 # XXX sqlite add
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145 sensor_update(sensor_id, measurements, first_real_time, time_step)
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146
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147 debugf.write("Updated %d sensors\n" % len(sensors))
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148 debugf.flush()