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// 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.
//go:build !nodevstat
// +build !nodevstat
package collector
import (
"errors"
"fmt"
"log/slog"
"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;
} 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(¤t) == -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(¤t);
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(¤t.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;
return stats;
}
*/
import "C"
const (
devstatSubsystem = "devstat"
)
type devstatCollector struct {
bytesDesc *prometheus.Desc
transfersDesc *prometheus.Desc
blocksDesc *prometheus.Desc
logger *slog.Logger
}
func init() {
registerCollector("devstat", defaultDisabled, NewDevstatCollector)
}
// NewDevstatCollector returns a new Collector exposing Device stats.
func NewDevstatCollector(logger *slog.Logger) (Collector, error) {
return &devstatCollector{
bytesDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, devstatSubsystem, "bytes_total"),
"The total number of bytes transferred for reads and writes on the device.",
[]string{"device"}, nil,
),
transfersDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, devstatSubsystem, "transfers_total"),
"The total number of transactions completed.",
[]string{"device"}, nil,
),
blocksDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, devstatSubsystem, "blocks_total"),
"The total number of bytes given in terms of the devices blocksize.",
[]string{"device"}, nil,
),
logger: logger,
}, nil
}
func (c *devstatCollector) Update(ch chan<- prometheus.Metric) 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)
ch <- prometheus.MustNewConstMetric(c.bytesDesc, prometheus.CounterValue, float64(stats.bytes), device)
ch <- prometheus.MustNewConstMetric(c.transfersDesc, prometheus.CounterValue, float64(stats.transfers), device)
ch <- prometheus.MustNewConstMetric(c.blocksDesc, prometheus.CounterValue, float64(stats.blocks), device)
}
return nil
}
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