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// Copyright 2015 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"
"sync"
"unsafe"
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
)
// #cgo LDFLAGS: -ldevstat -lkvm -lelf
// #include "devstat_freebsd.h"
import "C"
const (
devstatSubsystem = "devstat"
)
type devstatCollector struct {
mu sync.Mutex
devinfo *C.struct_devinfo
bytes typedDesc
transfers typedDesc
duration typedDesc
busyTime typedDesc
blocks typedDesc
logger log.Logger
}
func init() {
registerCollector("devstat", defaultDisabled, NewDevstatCollector)
}
// NewDevstatCollector returns a new Collector exposing Device stats.
func NewDevstatCollector(logger log.Logger) (Collector, error) {
return &devstatCollector{
devinfo: &C.struct_devinfo{},
bytes: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, devstatSubsystem, "bytes_total"),
"The total number of bytes in transactions.",
[]string{"device", "type"}, nil,
), prometheus.CounterValue},
transfers: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, devstatSubsystem, "transfers_total"),
"The total number of transactions.",
[]string{"device", "type"}, nil,
), prometheus.CounterValue},
duration: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, devstatSubsystem, "duration_seconds_total"),
"The total duration of transactions in seconds.",
[]string{"device", "type"}, nil,
), prometheus.CounterValue},
busyTime: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, devstatSubsystem, "busy_time_seconds_total"),
"Total time the device had one or more transactions outstanding in seconds.",
[]string{"device"}, nil,
), prometheus.CounterValue},
blocks: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, devstatSubsystem, "blocks_transferred_total"),
"The total number of blocks transferred.",
[]string{"device"}, nil,
), prometheus.CounterValue},
logger: logger,
}, nil
}
func (c *devstatCollector) Update(ch chan<- prometheus.Metric) error {
c.mu.Lock()
defer c.mu.Unlock()
var stats *C.Stats
n := C._get_stats(c.devinfo, &stats)
if n == -1 {
return errors.New("devstat_getdevs failed")
}
base := unsafe.Pointer(stats)
for i := C.int(0); i < n; i++ {
offset := i * C.int(C.sizeof_Stats)
stat := (*C.Stats)(unsafe.Pointer(uintptr(base) + uintptr(offset)))
device := fmt.Sprintf("%s%d", C.GoString(&stat.device[0]), stat.unit)
ch <- c.bytes.mustNewConstMetric(float64(stat.bytes.read), device, "read")
ch <- c.bytes.mustNewConstMetric(float64(stat.bytes.write), device, "write")
ch <- c.transfers.mustNewConstMetric(float64(stat.transfers.other), device, "other")
ch <- c.transfers.mustNewConstMetric(float64(stat.transfers.read), device, "read")
ch <- c.transfers.mustNewConstMetric(float64(stat.transfers.write), device, "write")
ch <- c.duration.mustNewConstMetric(float64(stat.duration.other), device, "other")
ch <- c.duration.mustNewConstMetric(float64(stat.duration.read), device, "read")
ch <- c.duration.mustNewConstMetric(float64(stat.duration.write), device, "write")
ch <- c.busyTime.mustNewConstMetric(float64(stat.busyTime), device)
ch <- c.blocks.mustNewConstMetric(float64(stat.blocks), device)
}
C.free(unsafe.Pointer(stats))
return nil
}
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