Mercurial > templog
annotate web/log.py @ 387:1ee4485b59a2
try and be a bit more frugal with stack
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 11 Jul 2012 00:22:31 +0800 |
| parents | abe8c530812e |
| children | 6f4497a448e8 |
| rev | line source |
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| 384 | 1 # -*- coding: utf-8 -*- |
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2 #:vim:et:ts=4:sts=4:sw=4: |
| 333 | 3 import rrdtool |
| 4 import os | |
| 335 | 5 import os.path |
| 333 | 6 import sys |
| 335 | 7 import glob |
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8 import hashlib |
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9 import tempfile |
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10 import time |
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11 import syslog |
| 349 | 12 import sqlite3 |
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13 import traceback |
| 373 | 14 import datetime |
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15 import struct |
| 383 | 16 import binascii |
| 335 | 17 from colorsys import hls_to_rgb |
| 333 | 18 |
| 334 | 19 import config |
| 333 | 20 |
| 21 def sensor_rrd_path(s): | |
| 334 | 22 return '%s/sensor_%s.rrd' % (config.DATA_PATH, s) |
| 333 | 23 |
| 335 | 24 # returns (path, sensor_name) tuples |
| 25 def all_sensors(): | |
| 26 return [(r, os.path.basename(r[:-4])) | |
| 27 for r in glob.glob('%s/*.rrd' % config.DATA_PATH)] | |
| 28 | |
| 333 | 29 def create_rrd(sensor_id): |
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30 # start date of 10 seconds into 1970 is used so that we can |
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31 # update with prior values straight away. |
| 367 | 32 if 'voltage' in sensor_id: |
| 369 | 33 args = [ |
| 34 '--step', '3600', | |
| 35 'DS:temp:GAUGE:7200:1:10', | |
| 36 'RRA:AVERAGE:0.5:1:87600'] | |
| 367 | 37 else: |
| 369 | 38 args = [ |
| 39 '--step', '300', | |
| 40 'DS:temp:GAUGE:600:-10:100', | |
| 367 | 41 'RRA:AVERAGE:0.5:1:1051200'] |
| 333 | 42 |
| 367 | 43 rrdtool.create(sensor_rrd_path(sensor_id), |
| 369 | 44 '--start', 'now-60d', |
| 367 | 45 *args) |
| 335 | 46 |
| 47 # stolen from viewmtn, stolen from monotone-viz | |
| 48 def colour_from_string(str): | |
| 49 def f(off): | |
| 50 return ord(hashval[off]) / 256.0 | |
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51 hashval = hashlib.sha1(str).digest() |
| 335 | 52 hue = f(5) |
| 53 li = f(1) * 0.15 + 0.55 | |
| 54 sat = f(2) * 0.5 + .5 | |
| 55 return ''.join(["%.2x" % int(x * 256) for x in hls_to_rgb(hue, li, sat)]) | |
| 56 | |
| 57 def graph_png(start, length): | |
| 58 rrds = all_sensors() | |
| 59 | |
| 60 graph_args = [] | |
| 367 | 61 have_volts = False |
| 335 | 62 for n, (rrdfile, sensor) in enumerate(rrds): |
| 367 | 63 if 'avrtemp' in sensor: |
| 64 continue | |
| 65 if 'voltage' in sensor: | |
| 66 have_volts = True | |
| 67 vname = 'scalevolts' | |
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68 graph_args.append('DEF:%(vname)s=%(rrdfile)s:temp:AVERAGE:step=3600' % locals()) |
| 384 | 69 unit = 'V' |
| 367 | 70 else: |
| 71 vname = 'temp%d' % n | |
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72 graph_args.append('DEF:raw%(vname)s=%(rrdfile)s:temp:AVERAGE' % locals()) |
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73 graph_args.append('CDEF:%(vname)s=raw%(vname)s,0.1,*,2,+' % locals()) |
| 384 | 74 unit = '<span face="Liberation Serif">ยบ</span>C' |
| 75 | |
| 76 last_value = float(rrdtool.info(rrdfile)['ds[temp].last_ds']) | |
| 335 | 77 width = config.LINE_WIDTH |
| 78 legend = config.SENSOR_NAMES.get(sensor, sensor) | |
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79 colour = config.SENSOR_COLOURS.get(legend, colour_from_string(sensor)) |
| 384 | 80 format_last_value = ('%f' % last_value).rstrip('0') + unit |
| 81 print_legend = '%s (%s)' % (legend, format_last_value) | |
| 82 graph_args.append('LINE%(width)f:%(vname)s#%(colour)s:%(print_legend)s' % locals()) | |
| 335 | 83 |
| 373 | 84 end = int(start+length) |
| 85 start = int(start) | |
| 86 | |
| 335 | 87 tempf = tempfile.NamedTemporaryFile() |
| 373 | 88 dateformat = '%H:%M:%S %Y-%m-%d' |
| 89 watermark = ("Now %s\t" | |
| 90 "Start %s\t" | |
| 91 "End %s" % ( | |
| 92 datetime.datetime.now().strftime(dateformat), | |
| 93 datetime.datetime.fromtimestamp(start).strftime(dateformat), | |
| 94 datetime.datetime.fromtimestamp(end).strftime(dateformat) )) | |
| 95 | |
| 96 args = [tempf.name, '-s', str(start), | |
| 97 '-e', str(end), | |
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98 '-w', str(config.GRAPH_WIDTH), |
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99 '-h', str(config.GRAPH_HEIGHT), |
| 335 | 100 '--slope-mode', |
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101 '--border', '0', |
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102 # '--vertical-label', 'Voltage', |
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103 '--y-grid', '0.1:1', |
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104 '--dynamic-labels', |
| 362 | 105 '--grid-dash', '1:0', |
| 383 | 106 '--zoom', str(config.ZOOM), |
| 362 | 107 '--color', 'GRID#00000000', |
| 108 '--color', 'MGRID#aaaaaa', | |
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109 '--color', 'BACK#ffffff', |
| 373 | 110 '--disable-rrdtool-tag', |
| 384 | 111 '--pango-markup', |
| 373 | 112 '--watermark', watermark, |
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113 '--imgformat', 'PNG'] \ |
| 335 | 114 + graph_args |
| 373 | 115 args += ['--font', 'DEFAULT:12:%s' % config.GRAPH_FONT] |
| 116 args += ['--font', 'WATERMARK:10:%s' % config.GRAPH_FONT] | |
| 367 | 117 if have_volts: |
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118 args += ['--right-axis', '10:-20', # matches the scalevolts CDEF above |
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119 '--right-axis-format', '%.0lf', |
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120 # '--right-axis-label', 'Temperature' |
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121 ] |
| 367 | 122 |
| 335 | 123 rrdtool.graph(*args) |
| 124 return tempf.read() | |
| 125 | |
| 333 | 126 def sensor_update(sensor_id, measurements, first_real_time, time_step): |
| 127 try: | |
| 128 open(sensor_rrd_path(sensor_id)) | |
| 129 except IOError, e: | |
| 130 create_rrd(sensor_id) | |
| 131 | |
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132 if measurements: |
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133 values = ['%d:%f' % p for p in |
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134 zip((first_real_time + time_step*t for t in xrange(len(measurements))), |
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135 measurements)] |
| 333 | 136 |
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137 rrdfile = sensor_rrd_path(sensor_id) |
| 346 | 138 # XXX what to do here when it fails... |
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139 for v in values: |
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140 try: |
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141 rrdtool.update(rrdfile, v) |
| 369 | 142 except rrdtool.error, e: |
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143 print>>sys.stderr, "Bad rrdtool update '%s'" % v |
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144 traceback.print_exc(file=sys.stderr) |
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145 |
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146 # be paranoid |
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147 f = file(rrdfile) |
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148 os.fsync(f.fileno()) |
| 333 | 149 |
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150 def record_debug(lines): |
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151 f = open('%s/debug.log' % config.DATA_PATH, 'a+') |
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152 f.write('===== %s =====\n' % time.strftime('%a, %d %b %Y %H:%M:%S')) |
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153 f.writelines(('%s\n' % s for s in lines)) |
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154 f.flush() |
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155 return f |
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156 |
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157 def convert_ds18b20_12bit(reading): |
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158 value = struct.unpack('>h', binascii.unhexlify(reading))[0] |
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159 return value * 0.0625 |
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160 |
| 333 | 161 def parse(lines): |
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162 |
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163 debugf = record_debug(lines) |
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164 |
| 333 | 165 entries = dict(l.split('=', 1) for l in lines) |
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166 if len(entries) != len(lines): |
| 333 | 167 raise Exception("Keys are not unique") |
| 168 | |
| 169 num_sensors = int(entries['sensors']) | |
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170 num_measurements = int(entries['measurements']) |
| 333 | 171 |
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172 sensors = [entries['sensor_id%d' % n] for n in xrange(num_sensors)] |
| 333 | 173 |
| 174 meas = [] | |
| 175 for s in sensors: | |
| 176 meas.append([]) | |
| 177 | |
| 178 for n in xrange(num_measurements): | |
| 383 | 179 vals = [convert_ds18b20_12bit(x) for x in entries["meas%d" % n].strip().split()] |
| 333 | 180 if len(vals) != num_sensors: |
| 181 raise Exception("Wrong number of sensors for measurement %d" % n) | |
| 182 # we make an array of values for each sensor | |
| 183 for s in xrange(num_sensors): | |
| 184 meas[s].append(vals[s]) | |
| 185 | |
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186 avr_now = float(entries['now']) |
| 333 | 187 avr_first_time = float(entries['first_time']) |
| 188 time_step = float(entries['time_step']) | |
| 189 | |
| 367 | 190 if 'avrtemp' in entries: |
| 191 avrtemp = val_scale(int(entries['avrtemp'])) | |
| 192 sensor_update('avrtemp', [avrtemp], time.time(), 1) | |
| 193 | |
| 194 if 'voltage' in entries: | |
| 195 voltage = 0.001 * int(entries['voltage']) | |
| 196 sensor_update('voltage', [voltage], time.time(), 1) | |
| 197 | |
| 346 | 198 #sqlite |
| 199 # - time | |
| 200 # - voltage | |
| 201 # - boot time | |
| 202 | |
| 333 | 203 first_real_time = time.time() - (avr_now - avr_first_time) |
| 204 | |
| 205 for sensor_id, measurements in zip(sensors, meas): | |
| 346 | 206 # XXX sqlite add |
| 333 | 207 sensor_update(sensor_id, measurements, first_real_time, time_step) |
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208 |
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209 debugf.write("Updated %d sensors\n" % len(sensors)) |
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210 debugf.flush() |