mirror of
https://github.com/prometheus/node_exporter.git
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ea55d0f5cb
Querying the number of devices separately from the device list itself is racy. Devices may be added or removed between the two calls; and removed devices would lead to a segfault.
106 lines
3.6 KiB
Go
106 lines
3.6 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nodevstat
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package collector
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import (
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"errors"
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"fmt"
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"unsafe"
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"github.com/prometheus/client_golang/prometheus"
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)
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// #cgo LDFLAGS: -ldevstat -lkvm
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// #include "devstat_freebsd.h"
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import "C"
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const (
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devstatSubsystem = "devstat"
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)
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type devstatCollector struct {
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bytes typedDesc
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bytes_total typedDesc
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transfers typedDesc
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duration typedDesc
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busyTime typedDesc
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blocks typedDesc
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}
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func init() {
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Factories["devstat"] = NewDevstatCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// Device stats.
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func NewDevstatCollector() (Collector, error) {
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return &devstatCollector{
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bytes: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, devstatSubsystem, "bytes_total"),
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"The total number of bytes in transactions.",
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[]string{"device", "type"}, nil,
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), prometheus.CounterValue},
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transfers: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, devstatSubsystem, "transfers_total"),
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"The total number of transactions.",
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[]string{"device", "type"}, nil,
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), prometheus.CounterValue},
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duration: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, devstatSubsystem, "duration_seconds_total"),
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"The total duration of transactions in seconds.",
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[]string{"device", "type"}, nil,
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), prometheus.CounterValue},
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busyTime: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, devstatSubsystem, "busy_time_seconds_total"),
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"Total time the device had one or more transactions outstanding in seconds.",
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[]string{"device"}, nil,
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), prometheus.CounterValue},
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blocks: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, devstatSubsystem, "blocks_transferred_total"),
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"The total number of blocks transferred.",
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[]string{"device"}, nil,
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), prometheus.CounterValue},
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}, nil
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}
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func (c *devstatCollector) Update(ch chan<- prometheus.Metric) error {
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var stats *C.Stats
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n := C._get_stats(&stats)
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if n == -1 {
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return errors.New("devstat_getdevs failed")
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}
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base := unsafe.Pointer(stats)
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for i := C.int(0); i < n; i++ {
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offset := i * C.int(C.sizeof_Stats)
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stat := (*C.Stats)(unsafe.Pointer(uintptr(base) + uintptr(offset)))
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device := fmt.Sprintf("%s%d", C.GoString(&stat.device[0]), stat.unit)
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ch <- c.bytes.mustNewConstMetric(float64(stat.bytes.read), device, "read")
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ch <- c.bytes.mustNewConstMetric(float64(stat.bytes.write), device, "write")
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ch <- c.transfers.mustNewConstMetric(float64(stat.transfers.other), device, "other")
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ch <- c.transfers.mustNewConstMetric(float64(stat.transfers.read), device, "read")
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ch <- c.transfers.mustNewConstMetric(float64(stat.transfers.write), device, "write")
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ch <- c.duration.mustNewConstMetric(float64(stat.duration.other), device, "other")
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ch <- c.duration.mustNewConstMetric(float64(stat.duration.read), device, "read")
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ch <- c.duration.mustNewConstMetric(float64(stat.duration.write), device, "write")
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ch <- c.busyTime.mustNewConstMetric(float64(stat.busyTime), device)
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ch <- c.blocks.mustNewConstMetric(float64(stat.blocks), device)
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}
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C.free(unsafe.Pointer(stats))
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return nil
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}
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