fingerprint

package
v0.0.0-...-1fdc273 Latest Latest
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 Go to latest Published: Jun 24, 2019 License: MPL-2.0 Imports: 29 Imported by: 0

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Index

Constants

View Source 
const (
	// This is where the AWS metadata server normally resides. We hardcode the
	// "instance" path as well since it's the only one we access here.
	DEFAULT_AWS_URL = "http://169.254.169.254/latest/meta-data/"

	// AwsMetadataTimeout is the timeout used when contacting the AWS metadata
	// service
	AwsMetadataTimeout = 2 * time.Second
)
View Source 
const (
	// This is where the GCE metadata server normally resides. We hardcode the
	// "instance" path as well since it's the only one we access here.
	DEFAULT_GCE_URL = "http://169.254.169.254/computeMetadata/v1/instance/"

	// GceMetadataTimeout is the timeout used when contacting the GCE metadata
	// service
	GceMetadataTimeout = 2 * time.Second
)
View Source 
const (
	EmptyDuration = time.Duration(0)

	// TightenNetworkTimeoutsConfig is a config key that can be used during
	// tests to tighten the timeouts for fingerprinters that make network calls.
	TightenNetworkTimeoutsConfig = "test.tighten_network_timeouts"
)

EmptyDuration is to be used by fingerprinters that are not periodic.

Variables

This section is empty.

Functions

func BuiltinFingerprints 

func BuiltinFingerprints() []string

BuiltinFingerprints is a slice containing the key names of all registered fingerprints available. The order of this slice should be preserved when fingerprinting.

func FindCgroupMountpointDir 

func FindCgroupMountpointDir() (string, error)

FindCgroupMountpointDir is used to find the cgroup mount point on a Linux system.

Types

type ArchFingerprint 

type ArchFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

ArchFingerprint is used to fingerprint the architecture

func (*ArchFingerprint) Fingerprint 

func (f *ArchFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

type CGroupFingerprint 

type CGroupFingerprint struct {
	// contains filtered or unexported fields
}

func (*CGroupFingerprint) Fingerprint 

func (f *CGroupFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

Fingerprint tries to find a valid cgroup mount point

func (*CGroupFingerprint) Periodic 

func (f *CGroupFingerprint) Periodic() (bool, time.Duration)

Periodic determines the interval at which the periodic fingerprinter will run.

type CPUFingerprint 

type CPUFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

CPUFingerprint is used to fingerprint the CPU

func (*CPUFingerprint) Fingerprint 

func (f *CPUFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

type ConsulFingerprint 

type ConsulFingerprint struct {
	// contains filtered or unexported fields
}

ConsulFingerprint is used to fingerprint for Consul

func (*ConsulFingerprint) Fingerprint 

func (f *ConsulFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

func (*ConsulFingerprint) Periodic 

func (f *ConsulFingerprint) Periodic() (bool, time.Duration)

type DefaultMountPointDetector 

type DefaultMountPointDetector struct {
}

Implements the interface detector which calls the cgroups library directly

func (*DefaultMountPointDetector) MountPoint 

func (b *DefaultMountPointDetector) MountPoint() (string, error)

Call out to the default cgroup library

type DefaultNetworkInterfaceDetector 

type DefaultNetworkInterfaceDetector struct {
}

Implements the interface detector which calls net directly

func (*DefaultNetworkInterfaceDetector) Addrs 

func (b *DefaultNetworkInterfaceDetector) Addrs(intf *net.Interface) ([]net.Addr, error)

func (*DefaultNetworkInterfaceDetector) InterfaceByName 

func (b *DefaultNetworkInterfaceDetector) InterfaceByName(name string) (*net.Interface, error)

func (*DefaultNetworkInterfaceDetector) Interfaces 

func (b *DefaultNetworkInterfaceDetector) Interfaces() ([]net.Interface, error)

type EnvAWSFingerprint 

type EnvAWSFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

EnvAWSFingerprint is used to fingerprint AWS metadata

func (*EnvAWSFingerprint) Fingerprint 

func (f *EnvAWSFingerprint) Fingerprint(request *FingerprintRequest, response *FingerprintResponse) error

type EnvGCEFingerprint 

type EnvGCEFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

EnvGCEFingerprint is used to fingerprint GCE metadata

func (*EnvGCEFingerprint) Fingerprint 

func (f *EnvGCEFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

func (*EnvGCEFingerprint) Get 

func (f *EnvGCEFingerprint) Get(attribute string, recursive bool) (string, error)

type Factory 

type Factory func(log.Logger) Fingerprint

Factory is used to instantiate a new Fingerprint

type Fingerprint 

type Fingerprint interface {
	// Fingerprint is used to update properties of the Node,
	// and returns a diff of updated node attributes and a potential error.
	Fingerprint(*FingerprintRequest, *FingerprintResponse) error

	// Periodic is a mechanism for the fingerprinter to indicate that it should
	// be run periodically. The return value is a boolean indicating if it
	// should be periodic, and if true, a duration.
	Periodic() (bool, time.Duration)
}

Fingerprint is used for doing "fingerprinting" of the host to automatically determine attributes, resources, and metadata about it. Each of these is a heuristic, and many of them can be applied on a particular host.

func NewArchFingerprint 

func NewArchFingerprint(logger log.Logger) Fingerprint

NewArchFingerprint is used to create an OS fingerprint

func NewCGroupFingerprint 

func NewCGroupFingerprint(logger log.Logger) Fingerprint

NewCGroupFingerprint returns a new cgroup fingerprinter

func NewCPUFingerprint 

func NewCPUFingerprint(logger log.Logger) Fingerprint

NewCPUFingerprint is used to create a CPU fingerprint

func NewConsulFingerprint 

func NewConsulFingerprint(logger log.Logger) Fingerprint

NewConsulFingerprint is used to create a Consul fingerprint

func NewEnvAWSFingerprint 

func NewEnvAWSFingerprint(logger log.Logger) Fingerprint

NewEnvAWSFingerprint is used to create a fingerprint from AWS metadata

func NewEnvGCEFingerprint 

func NewEnvGCEFingerprint(logger log.Logger) Fingerprint

NewEnvGCEFingerprint is used to create a fingerprint from GCE metadata

func NewFingerprint 

func NewFingerprint(name string, logger log.Logger) (Fingerprint, error)

NewFingerprint is used to instantiate and return a new fingerprint given the name and a logger

func NewHostFingerprint 

func NewHostFingerprint(logger log.Logger) Fingerprint

NewHostFingerprint is used to create a Host fingerprint

func NewMemoryFingerprint 

func NewMemoryFingerprint(logger log.Logger) Fingerprint

NewMemoryFingerprint is used to create a Memory fingerprint

func NewNetworkFingerprint 

func NewNetworkFingerprint(logger log.Logger) Fingerprint

NewNetworkFingerprint returns a new NetworkFingerprinter with the given logger

func NewNomadFingerprint 

func NewNomadFingerprint(logger log.Logger) Fingerprint

NewNomadFingerprint is used to create a Nomad fingerprint

func NewSignalFingerprint 

func NewSignalFingerprint(logger log.Logger) Fingerprint

NewSignalFingerprint is used to create a Signal fingerprint

func NewStorageFingerprint 

func NewStorageFingerprint(logger log.Logger) Fingerprint

func NewVaultFingerprint 

func NewVaultFingerprint(logger log.Logger) Fingerprint

NewVaultFingerprint is used to create a Vault fingerprint

type FingerprintRequest 

type FingerprintRequest struct {
	Config *config.Config
	Node   *structs.Node
}

FingerprintRequest is a request which a fingerprinter accepts to fingerprint the node

type FingerprintResponse 

type FingerprintResponse struct {
	Attributes    map[string]string
	Links         map[string]string
	Resources     *structs.Resources // COMPAT(0.10): Remove in 0.10
	NodeResources *structs.NodeResources

	// Detected is a boolean indicating whether the fingerprinter detected
	// if the resource was available
	Detected bool
}

FingerprintResponse is the response which a fingerprinter annotates with the results of the fingerprint method

func (*FingerprintResponse) AddAttribute 

func (f *FingerprintResponse) AddAttribute(name, value string)

AddAttribute adds the name and value for a node attribute to the fingerprint response 

func (f *FingerprintResponse) AddLink(name, value string)

AddLink adds a link entry to the fingerprint response

func (*FingerprintResponse) RemoveAttribute 

func (f *FingerprintResponse) RemoveAttribute(name string)

RemoveAttribute sets the given attribute to empty, which will later remove it entirely from the node 

func (f *FingerprintResponse) RemoveLink(name string)

RemoveLink removes a link entry from the fingerprint response. This will later remove it entirely from the node

type GCEMetadataNetworkInterface 

type GCEMetadataNetworkInterface struct {
	AccessConfigs []struct {
		ExternalIp string
		Type       string
	}
	ForwardedIps []string
	Ip           string
	Network      string
}

type HealthCheck 

type HealthCheck interface {
	// Check is used to update properties of the node on the status of the health
	// check
	HealthCheck(*cstructs.HealthCheckRequest, *cstructs.HealthCheckResponse) error

	// GetHealthCheckInterval is a mechanism for the health checker to indicate that
	// it should be run periodically. The return value is a boolean indicating
	// whether it should be done periodically, and the time interval at which
	// this check should happen.
	GetHealthCheckInterval(*cstructs.HealthCheckIntervalRequest, *cstructs.HealthCheckIntervalResponse) error
}

HealthCheck is used for doing periodic health checks. On a given time interfal, a health check will be called by the fingerprint manager of the node.

type HostFingerprint 

type HostFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

HostFingerprint is used to fingerprint the host

func (*HostFingerprint) Fingerprint 

func (f *HostFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

type MemoryFingerprint 

type MemoryFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

MemoryFingerprint is used to fingerprint the available memory on the node

func (*MemoryFingerprint) Fingerprint 

func (f *MemoryFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

type MountPointDetector 

type MountPointDetector interface {
	MountPoint() (string, error)
}

An interface to isolate calls to the cgroup library This facilitates testing where we can implement fake mount points to test various code paths

type NetworkFingerprint 

type NetworkFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

NetworkFingerprint is used to fingerprint the Network capabilities of a node

func (*NetworkFingerprint) Fingerprint 

func (f *NetworkFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

type NetworkInterfaceDetector 

type NetworkInterfaceDetector interface {
	Interfaces() ([]net.Interface, error)
	InterfaceByName(name string) (*net.Interface, error)
	Addrs(intf *net.Interface) ([]net.Addr, error)
}

An interface to isolate calls to various api in net package This facilitates testing where we can implement fake interfaces and addresses to test varios code paths

type NomadFingerprint 

type NomadFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

NomadFingerprint is used to fingerprint the Nomad version

func (*NomadFingerprint) Fingerprint 

func (f *NomadFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

type ReqError 

type ReqError struct {
	StatusCode int
}

func (ReqError) Error 

func (e ReqError) Error() string

type SignalFingerprint 

type SignalFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

SignalFingerprint is used to fingerprint the available signals

func (*SignalFingerprint) Fingerprint 

func (f *SignalFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

type StaticFingerprinter 

type StaticFingerprinter struct{}

StaticFingerprinter can be embedded in a struct that has a Fingerprint method to make it non-periodic.

func (*StaticFingerprinter) Periodic 

func (s *StaticFingerprinter) Periodic() (bool, time.Duration)

type StorageFingerprint 

type StorageFingerprint struct {
	StaticFingerprinter
	// contains filtered or unexported fields
}

StorageFingerprint is used to measure the amount of storage free for applications that the Nomad agent will run on this machine.

func (*StorageFingerprint) Fingerprint 

func (f *StorageFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

type VaultFingerprint 

type VaultFingerprint struct {
	// contains filtered or unexported fields
}

VaultFingerprint is used to fingerprint for Vault

func (*VaultFingerprint) Fingerprint 

func (f *VaultFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error

func (*VaultFingerprint) Periodic 

func (f *VaultFingerprint) Periodic() (bool, time.Duration)

Source Files

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