/usr/lib/python2.7/dist-packages/graphite/render/datalib.py is in graphite-web 0.9.12+debian-6.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 | """Copyright 2008 Orbitz WorldWide
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License."""
import socket
import struct
import time
from django.conf import settings
from graphite.logger import log
from graphite.storage import STORE, LOCAL_STORE
from graphite.render.hashing import ConsistentHashRing
from graphite.util import unpickle
try:
import cPickle as pickle
except ImportError:
import pickle
class TimeSeries(list):
def __init__(self, name, start, end, step, values, consolidate='average'):
self.name = name
self.start = start
self.end = end
self.step = step
list.__init__(self,values)
self.consolidationFunc = consolidate
self.valuesPerPoint = 1
self.options = {}
def __iter__(self):
if self.valuesPerPoint > 1:
return self.__consolidatingGenerator( list.__iter__(self) )
else:
return list.__iter__(self)
def consolidate(self, valuesPerPoint):
self.valuesPerPoint = int(valuesPerPoint)
def __consolidatingGenerator(self, gen):
buf = []
for x in gen:
buf.append(x)
if len(buf) == self.valuesPerPoint:
while None in buf: buf.remove(None)
if buf:
yield self.__consolidate(buf)
buf = []
else:
yield None
while None in buf: buf.remove(None)
if buf: yield self.__consolidate(buf)
else: yield None
raise StopIteration
def __consolidate(self, values):
usable = [v for v in values if v is not None]
if not usable: return None
if self.consolidationFunc == 'sum':
return sum(usable)
if self.consolidationFunc == 'average':
return float(sum(usable)) / len(usable)
if self.consolidationFunc == 'max':
return max(usable)
if self.consolidationFunc == 'min':
return min(usable)
raise Exception, "Invalid consolidation function!"
def __repr__(self):
return 'TimeSeries(name=%s, start=%s, end=%s, step=%s)' % (self.name, self.start, self.end, self.step)
def getInfo(self):
"""Pickle-friendly representation of the series"""
return {
'name' : self.name,
'start' : self.start,
'end' : self.end,
'step' : self.step,
'values' : list(self),
}
class CarbonLinkPool:
def __init__(self, hosts, timeout):
self.hosts = [ (server, instance) for (server, port, instance) in hosts ]
self.ports = dict( ((server, instance), port) for (server, port, instance) in hosts )
self.timeout = float(timeout)
self.hash_ring = ConsistentHashRing(self.hosts)
self.connections = {}
self.last_failure = {}
# Create a connection pool for each host
for host in self.hosts:
self.connections[host] = set()
def select_host(self, metric):
"Returns the carbon host that has data for the given metric"
return self.hash_ring.get_node(metric)
def get_connection(self, host):
# First try to take one out of the pool for this host
(server, instance) = host
port = self.ports[host]
connectionPool = self.connections[host]
try:
return connectionPool.pop()
except KeyError:
pass #nothing left in the pool, gotta make a new connection
log.cache("CarbonLink creating a new socket for %s" % str(host))
connection = socket.socket()
connection.settimeout(self.timeout)
try:
connection.connect( (server, port) )
except:
self.last_failure[host] = time.time()
raise
else:
connection.setsockopt( socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1 )
return connection
def query(self, metric):
request = dict(type='cache-query', metric=metric)
results = self.send_request(request)
log.cache("CarbonLink cache-query request for %s returned %d datapoints" % (metric, len(results)))
return results['datapoints']
def get_metadata(self, metric, key):
request = dict(type='get-metadata', metric=metric, key=key)
results = self.send_request(request)
log.cache("CarbonLink get-metadata request received for %s:%s" % (metric, key))
return results['value']
def set_metadata(self, metric, key, value):
request = dict(type='set-metadata', metric=metric, key=key, value=value)
results = self.send_request(request)
log.cache("CarbonLink set-metadata request received for %s:%s" % (metric, key))
return results
def send_request(self, request):
metric = request['metric']
serialized_request = pickle.dumps(request, protocol=-1)
len_prefix = struct.pack("!L", len(serialized_request))
request_packet = len_prefix + serialized_request
host = self.select_host(metric)
conn = self.get_connection(host)
try:
conn.sendall(request_packet)
result = self.recv_response(conn)
except:
self.last_failure[host] = time.time()
raise
else:
self.connections[host].add(conn)
if 'error' in result:
raise CarbonLinkRequestError(result['error'])
else:
return result
def recv_response(self, conn):
len_prefix = recv_exactly(conn, 4)
body_size = struct.unpack("!L", len_prefix)[0]
body = recv_exactly(conn, body_size)
return unpickle.loads(body)
# Utilities
class CarbonLinkRequestError(Exception):
pass
def recv_exactly(conn, num_bytes):
buf = ''
while len(buf) < num_bytes:
data = conn.recv( num_bytes - len(buf) )
if not data:
raise Exception("Connection lost")
buf += data
return buf
#parse hosts from local_settings.py
hosts = []
for host in settings.CARBONLINK_HOSTS:
parts = host.split(':')
server = parts[0]
port = int( parts[1] )
if len(parts) > 2:
instance = parts[2]
else:
instance = None
hosts.append( (server, int(port), instance) )
#A shared importable singleton
CarbonLink = CarbonLinkPool(hosts, settings.CARBONLINK_TIMEOUT)
# Data retrieval API
def fetchData(requestContext, pathExpr):
seriesList = []
startTime = requestContext['startTime']
endTime = requestContext['endTime']
if requestContext['localOnly']:
store = LOCAL_STORE
else:
store = STORE
for dbFile in store.find(pathExpr):
log.metric_access(dbFile.metric_path)
dbResults = dbFile.fetch( timestamp(startTime), timestamp(endTime) )
try:
cachedResults = CarbonLink.query(dbFile.real_metric)
results = mergeResults(dbResults, cachedResults)
except:
log.exception()
results = dbResults
if not results:
continue
(timeInfo,values) = results
(start,end,step) = timeInfo
series = TimeSeries(dbFile.metric_path, start, end, step, values)
series.pathExpression = pathExpr #hack to pass expressions through to render functions
seriesList.append(series)
return seriesList
def mergeResults(dbResults, cacheResults):
cacheResults = list(cacheResults)
if not dbResults:
return cacheResults
elif not cacheResults:
return dbResults
(timeInfo,values) = dbResults
(start,end,step) = timeInfo
for (timestamp, value) in cacheResults:
interval = timestamp - (timestamp % step)
try:
i = int(interval - start) / step
values[i] = value
except:
pass
return (timeInfo,values)
def timestamp(datetime):
"Convert a datetime object into epoch time"
return time.mktime( datetime.timetuple() )
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