107 lines
3.2 KiB
Go
107 lines
3.2 KiB
Go
package fingerprint
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import (
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"fmt"
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"log"
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"sort"
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"time"
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"github.com/hashicorp/nomad/client/config"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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// EmptyDuration is to be used by fingerprinters that are not periodic.
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const (
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EmptyDuration = time.Duration(0)
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)
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func init() {
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// Initialize the list of available fingerprinters per platform. Each
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// platform defines its own list of available fingerprinters.
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initPlatformFingerprints(hostFingerprinters)
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}
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var (
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// hostFingerprinters contains the host fingerprints which are available for a
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// given platform.
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hostFingerprinters = map[string]Factory{
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"arch": NewArchFingerprint,
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"consul": NewConsulFingerprint,
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"cpu": NewCPUFingerprint,
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"host": NewHostFingerprint,
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"memory": NewMemoryFingerprint,
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"network": NewNetworkFingerprint,
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"nomad": NewNomadFingerprint,
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"signal": NewSignalFingerprint,
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"storage": NewStorageFingerprint,
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"vault": NewVaultFingerprint,
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}
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// envFingerprinters contains the fingerprints that are environment specific.
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// This should run after the host fingerprinters as they may override specific
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// node resources with more detailed information.
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envFingerprinters = map[string]Factory{
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"env_aws": NewEnvAWSFingerprint,
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"env_gce": NewEnvGCEFingerprint,
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}
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)
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// BuiltinFingerprints is a slice containing the key names of all registered
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// fingerprints available. The order of this slice should be preserved when
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// fingerprinting.
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func BuiltinFingerprints() []string {
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fingerprints := make([]string, 0, len(hostFingerprinters))
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for k := range hostFingerprinters {
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fingerprints = append(fingerprints, k)
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}
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sort.Strings(fingerprints)
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for k := range envFingerprinters {
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fingerprints = append(fingerprints, k)
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}
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return fingerprints
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}
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// NewFingerprint is used to instantiate and return a new fingerprint
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// given the name and a logger
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func NewFingerprint(name string, logger *log.Logger) (Fingerprint, error) {
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// Lookup the factory function
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factory, ok := hostFingerprinters[name]
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if !ok {
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factory, ok = envFingerprinters[name]
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if !ok {
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return nil, fmt.Errorf("unknown fingerprint '%s'", name)
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}
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}
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// Instantiate the fingerprint
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f := factory(logger)
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return f, nil
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}
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// Factory is used to instantiate a new Fingerprint
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type Factory func(*log.Logger) Fingerprint
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// Fingerprint is used for doing "fingerprinting" of the
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// host to automatically determine attributes, resources,
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// and metadata about it. Each of these is a heuristic, and
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// many of them can be applied on a particular host.
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type Fingerprint interface {
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// Fingerprint is used to update properties of the Node,
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// and returns if the fingerprint was applicable and a potential error.
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Fingerprint(*config.Config, *structs.Node) (bool, error)
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// Periodic is a mechanism for the fingerprinter to indicate that it should
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// be run periodically. The return value is a boolean indicating if it
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// should be periodic, and if true, a duration.
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Periodic() (bool, time.Duration)
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}
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// StaticFingerprinter can be embedded in a struct that has a Fingerprint method
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// to make it non-periodic.
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type StaticFingerprinter struct{}
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func (s *StaticFingerprinter) Periodic() (bool, time.Duration) {
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return false, EmptyDuration
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}
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