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mysql_aggregate_: allow graphing only max/min value

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In some cases it can be useful to know the maximum value of any row of an
aggregate (for example, the maximum number of logins by a single user), without
graphing each row separately (because there are too many or the rows change).
This change allows that by setting the "only" parameter to "max" or "min".
This commit is contained in:
Alex Dehnert 2013-06-16 15:24:44 -04:00
parent 4a7a0de134
commit ce558089c4
1 changed files with 32 additions and 8 deletions
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40
plugins/mysql/mysql_aggregate_
View file

@ -17,6 +17,7 @@
# table: Mysql table name (no default, raises exception)
# field: field name, used in GROUP BY statement (default - empty, no group by)
# where: optional where condition (without "where", default - empty)
# only: optional; "max" or "min" to indicate that only the largest or smallest value should be graphed
#
# This plugin shows graphs of Mysql COUNT(*) results.
#
@ -96,6 +97,20 @@ else:
groupBy = ""
field = ""
if "only" in os.environ and os.environ["only"] != None:
if not field:
raise Exception("You should provide 'env.field' in configuration file")
only = os.environ["only"]
if only == "max":
dir = "DESC"
elif only == "min":
dir = "ASC"
else:
raise Exception("env.only should be 'max' or 'min'; found %s") % (only, )
order_by = "ORDER BY COUNT(*) %s LIMIT 1" % (dir, )
else:
order_by = ""
# Mysql where condition
if "where" in os.environ and os.environ["where"] != None:
where = "WHERE %s" % os.environ["where"]
@ -105,10 +120,10 @@ else:
# Mysql connection handler
conn = None
# Query to get field values
# Query to get field values (used only when graphing several values)
valuesQuery = "SELECT DISTINCT %s 1 FROM %s %s" % (field, table, where)
# Query to get graph data
aggregateQuery = "SELECT %sCOUNT(*) FROM %s %s %s" % (field, table, where, groupBy)
aggregateQuery = "SELECT %sCOUNT(*) FROM %s %s %s %s" % (field, table, where, groupBy, order_by)
# Connect to mysql
try:
@ -118,8 +133,10 @@ except MySQLdb.Error, e:
print "Error %d: %s" % (e.args[0], e.args[1])
sys.exit(1)
single_value = field == "" or order_by != ""
# init values tuple
if field != "":
if not single_value:
values = {}
cursor.execute(valuesQuery)
results = cursor.fetchall()
@ -140,13 +157,16 @@ elif len(sys.argv) == 2 and sys.argv[1] == "config":
else:
vlabel = "count(*)"
if field == "":
if single_value:
print "graph mysql_aggregate_%s" % table
print "graph_title %s" % label
print "graph_vlabel %s" % vlabel
print "graph_category mysql"
print ""
print "values_count.label count"
if "only" in os.environ:
print "values_count.label %s" % (os.environ["only"], )
else:
print "values_count.label count"
else:
print "multigraph mysql_aggregate_%s" % table
print "graph_title %s" % label
@ -171,11 +191,15 @@ else:
try:
cursor.execute(aggregateQuery)
if field == "":
if single_value:
result = cursor.fetchone()
count = 0
if result[0]:
count = count + result[0]
if field:
ind = 1
else:
ind = 0
if result[ind]:
count = count + result[ind]
print "values_count.value %s" % count
else:
results = cursor.fetchall()