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netdata/python.d/redis.chart.py at master · bosencoding/netdata · GitHub
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redis.chart.py
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redis.chart.py
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# -*- coding: utf-8 -*-
# Description: redis netdata python.d module
# Author: Pawel Krupa (paulfantom)
from
base
import
SocketService
# default module values (can be overridden per job in `config`)
#update_every = 2
priority
=
60000
retries
=
60
# default job configuration (overridden by python.d.plugin)
# config = {'local': {
# 'update_every': update_every,
# 'retries': retries,
# 'priority': priority,
# 'host': 'localhost',
# 'port': 6379,
# 'unix_socket': None
# }}
ORDER
=
[
'operations'
,
'hit_rate'
,
'memory'
,
'keys'
,
'clients'
,
'slaves'
]
CHARTS
=
{
'operations'
: {
'options'
: [
None
,
'Operations'
,
'operations/s'
,
'Statistics'
,
'redis.statistics'
,
'line'
],
'lines'
: [
[
'instantaneous_ops_per_sec'
,
'operations'
,
'absolute'
]
]},
'hit_rate'
: {
'options'
: [
None
,
'Hit rate'
,
'percent'
,
'Statistics'
,
'redis.statistics'
,
'line'
],
'lines'
: [
[
'hit_rate'
,
'rate'
,
'absolute'
]
]},
'memory'
: {
'options'
: [
None
,
'Memory utilization'
,
'kilobytes'
,
'Memory'
,
'redis.memory'
,
'line'
],
'lines'
: [
[
'used_memory'
,
'total'
,
'absolute'
,
1
,
1024
],
[
'used_memory_lua'
,
'lua'
,
'absolute'
,
1
,
1024
]
]},
'keys'
: {
'options'
: [
None
,
'Database keys'
,
'keys'
,
'Keys'
,
'redis.keys'
,
'line'
],
'lines'
: [
# lines are created dynamically in `check()` method
]},
'clients'
: {
'options'
: [
None
,
'Clients'
,
'clients'
,
'Clients'
,
'redis.clients'
,
'line'
],
'lines'
: [
[
'connected_clients'
,
'connected'
,
'absolute'
],
[
'blocked_clients'
,
'blocked'
,
'absolute'
]
]},
'slaves'
: {
'options'
: [
None
,
'Slaves'
,
'slaves'
,
'Replication'
,
'redis.replication'
,
'line'
],
'lines'
: [
[
'connected_slaves'
,
'connected'
,
'absolute'
]
]}
}
class
Service
(
SocketService
):
def
__init__
(
self
,
configuration
=
None
,
name
=
None
):
SocketService
.
__init__
(
self
,
configuration
=
configuration
,
name
=
name
)
self
.
request
=
"INFO
\r
\n
"
self
.
host
=
"localhost"
self
.
port
=
6379
self
.
unix_socket
=
None
self
.
order
=
ORDER
self
.
definitions
=
CHARTS
self
.
_keep_alive
=
True
self
.
chart_name
=
""
def
_get_data
(
self
):
"""
Get data from socket
:return: dict
"""
try
:
raw
=
self
.
_get_raw_data
().
split
(
"
\n
"
)
except
AttributeError
:
self
.
error
(
"no data received"
)
return
None
data
=
{}
for
line
in
raw
:
if
line
.
startswith
((
'instantaneous'
,
'keyspace'
,
'used_memory'
,
'connected'
,
'blocked'
)):
try
:
t
=
line
.
split
(
':'
)
data
[
t
[
0
]]
=
int
(
t
[
1
])
except
(
IndexError
,
ValueError
):
pass
elif
line
.
startswith
(
'db'
):
tmp
=
line
.
split
(
','
)[
0
].
replace
(
'keys='
,
''
)
record
=
tmp
.
split
(
':'
)
data
[
record
[
0
]]
=
int
(
record
[
1
])
try
:
data
[
'hit_rate'
]
=
int
((
data
[
'keyspace_hits'
]
/
float
(
data
[
'keyspace_hits'
]
+
data
[
'keyspace_misses'
]))
*
100
)
except
:
data
[
'hit_rate'
]
=
0
if
len
(
data
)
==
0
:
self
.
error
(
"received data doesn't have needed records"
)
return
None
else
:
return
data
def
_check_raw_data
(
self
,
data
):
"""
Check if all data has been gathered from socket.
Parse first line containing message length and check against received message
:param data: str
:return: boolean
"""
length
=
len
(
data
)
supposed
=
data
.
split
(
'
\n
'
)[
0
][
1
:]
offset
=
len
(
supposed
)
+
4
# 1 dollar sing, 1 new line character + 1 ending sequence '\r\n'
supposed
=
int
(
supposed
)
if
length
-
offset
>=
supposed
:
return
True
else
:
return
False
return
False
def
check
(
self
):
"""
Parse configuration, check if redis is available, and dynamically create chart lines data
:return: boolean
"""
self
.
_parse_config
()
if
self
.
name
==
""
:
self
.
name
=
"local"
self
.
chart_name
+=
"_"
+
self
.
name
data
=
self
.
_get_data
()
if
data
is
None
:
return
False
for
name
in
data
:
if
name
.
startswith
(
'db'
):
self
.
definitions
[
'keys'
][
'lines'
].
append
([
name
,
None
,
'absolute'
])
return
True
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