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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 !nofilesystem
// +build linux freebsd openbsd darwin,amd64 dragonfly
package collector
import (
"regexp"
"github.com/prometheus/client_golang/prometheus"
"gopkg.in/alecthomas/kingpin.v2"
)
// Arch-dependent implementation must define:
// * defIgnoredMountPoints
// * defIgnoredFSTypes
// * filesystemLabelNames
// * filesystemCollector.GetStats
var (
ignoredMountPoints = kingpin.Flag(
"collector.filesystem.ignored-mount-points",
"Regexp of mount points to ignore for filesystem collector.",
).Default(defIgnoredMountPoints).String()
ignoredFSTypes = kingpin.Flag(
"collector.filesystem.ignored-fs-types",
"Regexp of filesystem types to ignore for filesystem collector.",
).Default(defIgnoredFSTypes).String()
filesystemLabelNames = []string{"device", "mountpoint", "fstype"}
)
type filesystemCollector struct {
ignoredMountPointsPattern *regexp.Regexp
ignoredFSTypesPattern *regexp.Regexp
sizeDesc, freeDesc, availDesc *prometheus.Desc
filesDesc, filesFreeDesc *prometheus.Desc
roDesc, deviceErrorDesc *prometheus.Desc
}
type filesystemLabels struct {
device, mountPoint, fsType, options string
}
type filesystemStats struct {
labels filesystemLabels
size, free, avail float64
files, filesFree float64
ro, deviceError float64
}
func init() {
registerCollector("filesystem", defaultEnabled, NewFilesystemCollector)
}
// NewFilesystemCollector returns a new Collector exposing filesystems stats.
func NewFilesystemCollector() (Collector, error) {
subsystem := "filesystem"
mountPointPattern := regexp.MustCompile(*ignoredMountPoints)
filesystemsTypesPattern := regexp.MustCompile(*ignoredFSTypes)
sizeDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "size_bytes"),
"Filesystem size in bytes.",
filesystemLabelNames, nil,
)
freeDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "free_bytes"),
"Filesystem free space in bytes.",
filesystemLabelNames, nil,
)
availDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "avail_bytes"),
"Filesystem space available to non-root users in bytes.",
filesystemLabelNames, nil,
)
filesDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "files"),
"Filesystem total file nodes.",
filesystemLabelNames, nil,
)
filesFreeDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "files_free"),
"Filesystem total free file nodes.",
filesystemLabelNames, nil,
)
roDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "readonly"),
"Filesystem read-only status.",
filesystemLabelNames, nil,
)
deviceErrorDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "device_error"),
"Whether an error occurred while getting statistics for the given device.",
filesystemLabelNames, nil,
)
return &filesystemCollector{
ignoredMountPointsPattern: mountPointPattern,
ignoredFSTypesPattern: filesystemsTypesPattern,
sizeDesc: sizeDesc,
freeDesc: freeDesc,
availDesc: availDesc,
filesDesc: filesDesc,
filesFreeDesc: filesFreeDesc,
roDesc: roDesc,
deviceErrorDesc: deviceErrorDesc,
}, nil
}
func (c *filesystemCollector) Update(ch chan<- prometheus.Metric) error {
stats, err := c.GetStats()
if err != nil {
return err
}
// Make sure we expose a metric once, even if there are multiple mounts
seen := map[filesystemLabels]bool{}
for _, s := range stats {
if seen[s.labels] {
continue
}
seen[s.labels] = true
ch <- prometheus.MustNewConstMetric(
c.deviceErrorDesc, prometheus.GaugeValue,
s.deviceError, s.labels.device, s.labels.mountPoint, s.labels.fsType,
)
if s.deviceError > 0 {
continue
}
ch <- prometheus.MustNewConstMetric(
c.sizeDesc, prometheus.GaugeValue,
s.size, s.labels.device, s.labels.mountPoint, s.labels.fsType,
)
ch <- prometheus.MustNewConstMetric(
c.freeDesc, prometheus.GaugeValue,
s.free, s.labels.device, s.labels.mountPoint, s.labels.fsType,
)
ch <- prometheus.MustNewConstMetric(
c.availDesc, prometheus.GaugeValue,
s.avail, s.labels.device, s.labels.mountPoint, s.labels.fsType,
)
ch <- prometheus.MustNewConstMetric(
c.filesDesc, prometheus.GaugeValue,
s.files, s.labels.device, s.labels.mountPoint, s.labels.fsType,
)
ch <- prometheus.MustNewConstMetric(
c.filesFreeDesc, prometheus.GaugeValue,
s.filesFree, s.labels.device, s.labels.mountPoint, s.labels.fsType,
)
ch <- prometheus.MustNewConstMetric(
c.roDesc, prometheus.GaugeValue,
s.ro, s.labels.device, s.labels.mountPoint, s.labels.fsType,
)
}
return nil
}
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