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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.
package collector
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
)
// Numerical metric provided by /proc/drbd.
type drbdNumericalMetric struct {
desc *prometheus.Desc
valueType prometheus.ValueType
multiplier float64
}
func newDRBDNumericalMetric(name string, desc string, valueType prometheus.ValueType, multiplier float64) drbdNumericalMetric {
return drbdNumericalMetric{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "drbd", name),
desc,
[]string{"device"}, nil),
valueType: valueType,
multiplier: multiplier,
}
}
// String pair metric provided by /proc/drbd.
type drbdStringPairMetric struct {
desc *prometheus.Desc
valueOkay string
}
func (metric *drbdStringPairMetric) isOkay(value string) float64 {
if value == metric.valueOkay {
return 1
}
return 0
}
func newDRBDStringPairMetric(name string, desc string, valueOkay string) drbdStringPairMetric {
return drbdStringPairMetric{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "drbd", name),
desc,
[]string{"device", "node"}, nil),
valueOkay: valueOkay,
}
}
var (
drbdNumericalMetrics = map[string]drbdNumericalMetric{
"ns": newDRBDNumericalMetric(
"network_sent_bytes_total",
"Total number of bytes sent via the network.",
prometheus.CounterValue,
1024),
"nr": newDRBDNumericalMetric(
"network_received_bytes_total",
"Total number of bytes received via the network.",
prometheus.CounterValue,
1),
"dw": newDRBDNumericalMetric(
"disk_written_bytes_total",
"Net data written on local hard disk; in bytes.",
prometheus.CounterValue,
1024),
"dr": newDRBDNumericalMetric(
"disk_read_bytes_total",
"Net data read from local hard disk; in bytes.",
prometheus.CounterValue,
1024),
"al": newDRBDNumericalMetric(
"activitylog_writes_total",
"Number of updates of the activity log area of the meta data.",
prometheus.CounterValue,
1),
"bm": newDRBDNumericalMetric(
"bitmap_writes_total",
"Number of updates of the bitmap area of the meta data.",
prometheus.CounterValue,
1),
"lo": newDRBDNumericalMetric(
"local_pending",
"Number of open requests to the local I/O sub-system.",
prometheus.GaugeValue,
1),
"pe": newDRBDNumericalMetric(
"remote_pending",
"Number of requests sent to the peer, but that have not yet been answered by the latter.",
prometheus.GaugeValue,
1),
"ua": newDRBDNumericalMetric(
"remote_unacknowledged",
"Number of requests received by the peer via the network connection, but that have not yet been answered.",
prometheus.GaugeValue,
1),
"ap": newDRBDNumericalMetric(
"application_pending",
"Number of block I/O requests forwarded to DRBD, but not yet answered by DRBD.",
prometheus.GaugeValue,
1),
"ep": newDRBDNumericalMetric(
"epochs",
"Number of Epochs currently on the fly.",
prometheus.GaugeValue,
1),
"oos": newDRBDNumericalMetric(
"out_of_sync_bytes",
"Amount of data known to be out of sync; in bytes.",
prometheus.GaugeValue,
1024),
}
drbdStringPairMetrics = map[string]drbdStringPairMetric{
"ro": newDRBDStringPairMetric(
"node_role_is_primary",
"Whether the role of the node is in the primary state.",
"Primary"),
"ds": newDRBDStringPairMetric(
"disk_state_is_up_to_date",
"Whether the disk of the node is up to date.",
"UpToDate"),
}
drbdConnected = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "drbd", "connected"),
"Whether DRBD is connected to the peer.",
[]string{"device"}, nil)
)
type drbdCollector struct{}
func init() {
registerCollector("drbd", defaultDisabled, newDRBDCollector)
}
func newDRBDCollector() (Collector, error) {
return &drbdCollector{}, nil
}
func (c *drbdCollector) Update(ch chan<- prometheus.Metric) error {
statsFile := procFilePath("drbd")
file, err := os.Open(statsFile)
if err != nil {
if os.IsNotExist(err) {
log.Debugf("Not collecting DRBD statistics, as %s does not exist: %s", statsFile, err)
return nil
}
return err
}
defer file.Close()
scanner := bufio.NewScanner(file)
scanner.Split(bufio.ScanWords)
device := "unknown"
for scanner.Scan() {
field := scanner.Text()
if kv := strings.Split(field, ":"); len(kv) == 2 {
if id, err := strconv.ParseUint(kv[0], 10, 64); err == nil && kv[1] == "" {
device = fmt.Sprintf("drbd%d", id)
} else if metric, ok := drbdNumericalMetrics[kv[0]]; ok {
// Numerical value.
value, err := strconv.ParseFloat(kv[1], 64)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(
metric.desc, metric.valueType,
value*metric.multiplier, device)
} else if metric, ok := drbdStringPairMetrics[kv[0]]; ok {
// String pair value.
values := strings.Split(kv[1], "/")
ch <- prometheus.MustNewConstMetric(
metric.desc, prometheus.GaugeValue,
metric.isOkay(values[0]), device, "local")
ch <- prometheus.MustNewConstMetric(
metric.desc, prometheus.GaugeValue,
metric.isOkay(values[1]), device, "remote")
} else if kv[0] == "cs" {
// Connection state.
var connected float64
if kv[1] == "Connected" {
connected = 1
}
ch <- prometheus.MustNewConstMetric(
drbdConnected, prometheus.GaugeValue,
connected, device)
} else {
log.Debugf("Don't know how to process key-value pair [%s: %q]", kv[0], kv[1])
}
} else {
log.Debugf("Don't know how to process string %q", field)
}
}
return scanner.Err()
}
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