60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
// +build linux
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package fingerprint
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import (
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"log"
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"time"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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const (
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cgroupAvailable = "available"
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cgroupUnavailable = "unavailable"
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interval = 15
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)
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type CGroupFingerprint struct {
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logger *log.Logger
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lastState string
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mountPointDetector MountPointDetector
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}
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// An interface to isolate calls to the cgroup library
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// This facilitates testing where we can implement
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// fake mount points to test various code paths
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type MountPointDetector interface {
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MountPoint() (string, error)
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}
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// Implements the interface detector which calls the cgroups library directly
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type DefaultMountPointDetector struct {
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}
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// Call out to the default cgroup library
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func (b *DefaultMountPointDetector) MountPoint() (string, error) {
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return FindCgroupMountpointDir()
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}
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// NewCGroupFingerprint returns a new cgroup fingerprinter
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func NewCGroupFingerprint(logger *log.Logger) Fingerprint {
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f := &CGroupFingerprint{
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logger: logger,
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lastState: cgroupUnavailable,
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mountPointDetector: &DefaultMountPointDetector{},
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}
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return f
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}
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// clearCGroupAttributes clears any node attributes related to cgroups that might
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// have been set in a previous fingerprint run.
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func (f *CGroupFingerprint) clearCGroupAttributes(n *structs.Node) {
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delete(n.Attributes, "unique.cgroup.mountpoint")
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}
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// Periodic determines the interval at which the periodic fingerprinter will run.
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func (f *CGroupFingerprint) Periodic() (bool, time.Duration) {
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return true, interval * time.Second
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}
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