Export devstat for dragonfly

This commit is contained in:
stuart nelson 2016-09-28 21:08:52 +02:00
parent bb2b984030
commit 2b74cf7498

View File

@ -0,0 +1,232 @@
// Copyright 2016 The Prometheus Authors
// 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.
// +build !nodevstat
package collector
import (
"errors"
"fmt"
"github.com/prometheus/client_golang/prometheus"
)
/*
#cgo LDFLAGS: -ldevstat
#include <devstat.h>
#include <stdlib.h>
#include <string.h>
typedef struct {
char device[DEVSTAT_NAME_LEN];
int unit;
uint64_t bytes;
uint64_t transfers;
uint64_t blocks;
double kb_per_transfer;
double transfers_per_second;
double mb_per_second;
double blocks_per_second;
double ms_per_transaction;
} Stats;
int _get_ndevs() {
struct statinfo current;
int num_devices;
current.dinfo = (struct devinfo *)calloc(1, sizeof(struct devinfo));
if (current.dinfo == NULL)
return -2;
checkversion();
if (getdevs(&current) == -1)
return -1;
return current.dinfo->numdevs;
}
Stats _get_stats(int i) {
struct statinfo current;
int num_devices;
current.dinfo = (struct devinfo *)calloc(1, sizeof(struct devinfo));
getdevs(&current);
num_devices = current.dinfo->numdevs;
Stats stats;
uint64_t total_bytes, total_transfers, total_blocks;
long double kb_per_transfer, transfers_per_second, mb_per_second, blocks_per_second, ms_per_transaction;
strcpy(stats.device, current.dinfo->devices[i].device_name);
stats.unit = current.dinfo->devices[i].unit_number;
compute_stats(&current.dinfo->devices[i],
NULL,
1.0,
&total_bytes,
&total_transfers,
&total_blocks,
&kb_per_transfer,
&transfers_per_second,
&mb_per_second,
&blocks_per_second,
&ms_per_transaction);
stats.bytes = total_bytes;
stats.transfers = total_transfers;
stats.blocks = total_blocks;
stats.kb_per_transfer = kb_per_transfer;
stats.transfers_per_second = transfers_per_second;
stats.mb_per_second = mb_per_second;
stats.blocks_per_second = blocks_per_second;
stats.ms_per_transaction = ms_per_transaction;
return stats;
}
*/
import "C"
const (
devstatSubsystem = "devstat"
)
type devstatCollector struct {
bytes_total *prometheus.CounterVec
transfers_total *prometheus.CounterVec
blocks_total *prometheus.CounterVec
bytes_per_transfer *prometheus.GaugeVec
transfers_per_second *prometheus.GaugeVec
bytes_per_second *prometheus.GaugeVec
blocks_per_second *prometheus.GaugeVec
seconds_per_transaction *prometheus.GaugeVec
}
func init() {
Factories["devstat"] = NewDevstatCollector
}
// Takes a prometheus registry and returns a new Collector exposing
// Device stats.
func NewDevstatCollector() (Collector, error) {
return &devstatCollector{
bytes_total: prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: Namespace,
Subsystem: devstatSubsystem,
Name: "bytes_total",
Help: "The total number of bytes transferred for reads and writes on the device.",
},
[]string{"device"},
),
transfers_total: prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: Namespace,
Subsystem: devstatSubsystem,
Name: "transfers_total",
Help: "The total number of transactions completed.",
},
[]string{"device"},
),
blocks_total: prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: Namespace,
Subsystem: devstatSubsystem,
Name: "blocks_total",
Help: "The total number of bytes given in terms of the devices blocksize.",
},
[]string{"device"},
),
bytes_per_transfer: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Subsystem: devstatSubsystem,
Name: "bytes_per_transfer",
Help: "The average number of bytes per transfer.",
},
[]string{"device"},
),
transfers_per_second: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Subsystem: devstatSubsystem,
Name: "transfers_per_second",
Help: "The average number of transfers per second.",
},
[]string{"device"},
),
bytes_per_second: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Subsystem: devstatSubsystem,
Name: "bytes_per_second",
Help: "The average bytes per second.",
},
[]string{"device"},
),
blocks_per_second: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Subsystem: devstatSubsystem,
Name: "blocks_per_second",
Help: "The average blocks per second.",
},
[]string{"device"},
),
seconds_per_transaction: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Subsystem: devstatSubsystem,
Name: "seconds_per_transaction",
Help: "The average number of seconds per transaction.",
},
[]string{"device"},
),
}, nil
}
func (c *devstatCollector) Update(ch chan<- prometheus.Metric) (err error) {
count := C._get_ndevs()
if count == -1 {
return errors.New("getdevs() failed")
}
if count == -2 {
return errors.New("calloc() failed")
}
for i := C.int(0); i < count; i++ {
stats := C._get_stats(i)
device := fmt.Sprintf("%s%d", C.GoString(&stats.device[0]), stats.unit)
c.bytes_total.With(prometheus.Labels{"device": device}).Set(float64(stats.bytes))
c.transfers_total.With(prometheus.Labels{"device": device}).Set(float64(stats.transfers))
c.blocks_total.With(prometheus.Labels{"device": device}).Set(float64(stats.blocks))
c.bytes_per_transfer.With(prometheus.Labels{"device": device}).Set(float64(stats.kb_per_transfer) * 1000)
c.bytes_per_second.With(prometheus.Labels{"device": device}).Set(float64(stats.mb_per_second) * 1000000)
c.transfers_per_second.With(prometheus.Labels{"device": device}).Set(float64(stats.transfers_per_second))
c.blocks_per_second.With(prometheus.Labels{"device": device}).Set(float64(stats.blocks_per_second))
c.seconds_per_transaction.With(prometheus.Labels{"device": device}).Set(float64(stats.ms_per_transaction) / 1000)
}
c.bytes_total.Collect(ch)
c.transfers_total.Collect(ch)
c.blocks_total.Collect(ch)
c.bytes_per_transfer.Collect(ch)
c.bytes_per_second.Collect(ch)
c.transfers_per_second.Collect(ch)
c.blocks_per_second.Collect(ch)
c.seconds_per_transaction.Collect(ch)
return err
}