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// Copyright 2019 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 !nodiskstats
package collector
import (
"unsafe"
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
/*
#include <sys/types.h>
#include <sys/disk.h>
*/
import "C"
type diskstatsCollector struct {
rxfer typedDesc
rbytes typedDesc
wxfer typedDesc
wbytes typedDesc
time typedDesc
logger log.Logger
}
func init() {
registerCollector("diskstats", defaultEnabled, NewDiskstatsCollector)
}
// NewDiskstatsCollector returns a new Collector exposing disk device stats.
func NewDiskstatsCollector(logger log.Logger) (Collector, error) {
return &diskstatsCollector{
rxfer: typedDesc{readsCompletedDesc, prometheus.CounterValue},
rbytes: typedDesc{readBytesDesc, prometheus.CounterValue},
wxfer: typedDesc{writesCompletedDesc, prometheus.CounterValue},
wbytes: typedDesc{writtenBytesDesc, prometheus.CounterValue},
time: typedDesc{ioTimeSecondsDesc, prometheus.CounterValue},
logger: logger,
}, nil
}
func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) (err error) {
diskstatsb, err := unix.SysctlRaw("hw.diskstats")
if err != nil {
return err
}
ndisks := len(diskstatsb) / C.sizeof_struct_diskstats
diskstats := *(*[]C.struct_diskstats)(unsafe.Pointer(&diskstatsb))
for i := 0; i < ndisks; i++ {
diskname := C.GoString(&diskstats[i].ds_name[0])
ch <- c.rxfer.mustNewConstMetric(float64(diskstats[i].ds_rxfer), diskname)
ch <- c.rbytes.mustNewConstMetric(float64(diskstats[i].ds_rbytes), diskname)
ch <- c.wxfer.mustNewConstMetric(float64(diskstats[i].ds_wxfer), diskname)
ch <- c.wbytes.mustNewConstMetric(float64(diskstats[i].ds_wbytes), diskname)
time := float64(diskstats[i].ds_time.tv_sec) + float64(diskstats[i].ds_time.tv_usec)/1000000
ch <- c.time.mustNewConstMetric(time, diskname)
}
return nil
}
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