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¶
Overview ¶
Package mb (short for Metricbeat) contains the public interfaces that are used to implement Modules and their associated MetricSets.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
var ( // ErrEmptyConfig indicates that modules configuration list is nil or empty. ErrEmptyConfig = errors.New("one or more modules must be configured") // ErrAllModulesDisabled indicates that all modules are disabled. At least // one module must be enabled. ErrAllModulesDisabled = errors.New("all modules are disabled") )
var DefaultModuleFactory = func(base BaseModule) (Module, error) { return &base, nil }
DefaultModuleFactory returns the given BaseModule and never returns an error. If a MetricSets are registered without an associated ModuleFactory, then the DefaultModuleFactory will be used to instantiate a Module.
var Registry = NewRegister()
Registry is the singleton Register instance where all ModuleFactory's and MetricSetFactory's should be registered.
Functions ¶
func NewModules ¶
NewModules builds new Modules and their associated MetricSets based on the provided configuration data. config is a list module config data (the data will be unpacked into ModuleConfig structs). r is the Register where the ModuleFactory's and MetricSetFactory's will be obtained from. This method returns a mapping of Modules to MetricSets or an error.
Types ¶
type BaseMetricSet ¶
type BaseMetricSet struct {
// contains filtered or unexported fields
}
BaseMetricSet implements the MetricSet interface.
The BaseMetricSet type can be embedded into another struct to satisfy the MetricSet interface requirements, leaving only the Fetch() method to be implemented to have a complete MetricSet implementation.
func (*BaseMetricSet) Host ¶
func (b *BaseMetricSet) Host() string
Host returns the hostname or other module specific value that identifies a specific host or service instance from which to collect metrics.
func (*BaseMetricSet) Module ¶
func (b *BaseMetricSet) Module() Module
Module returns the parent Module for the MetricSet.
func (*BaseMetricSet) Name ¶
func (b *BaseMetricSet) Name() string
Name returns the name of the MetricSet. It should not include the name of the module.
type BaseModule ¶
type BaseModule struct {
// contains filtered or unexported fields
}
BaseModule implements the Module interface.
When a Module needs to store additional data or provide methods to its MetricSets, it can embed this type into another struct to satisfy the Module interface requirements.
func (*BaseModule) Config ¶
func (m *BaseModule) Config() ModuleConfig
Config returns the ModuleConfig used to create the Module.
func (*BaseModule) UnpackConfig ¶
func (m *BaseModule) UnpackConfig(to interface{}) error
UnpackConfig unpacks the raw module config to the given object.
type EventFetcher ¶
EventFetcher is a MetricSet that returns a single event when collecting data.
type EventsFetcher ¶
EventsFetcher is a MetricSet that returns a multiple events when collecting data.
type MetricSet ¶
type MetricSet interface {
Name() string // Name returns the name of the MetricSet.
Module() Module // Module returns the parent Module for the MetricSet.
Host() string // Host returns a hostname or other module specific value
}
MetricSet is the common interface for all MetricSet implementations. In addition to this interface, all MetricSets must implement either EventFetcher or EventsFetcher (but not both).
type MetricSetFactory ¶
type MetricSetFactory func(base BaseMetricSet) (MetricSet, error)
MetricSetFactory accepts a BaseMetricSet and returns a MetricSet. If there was an error creating the MetricSet then an error will be returned. The returned MetricSet must also implement either EventFetcher or EventsFetcher (but not both).
Example ¶
ExampleMetricSetFactory demonstrates how to register a MetricSetFactory and unpack additional configuration data.
package main
import (
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/metricbeat/mb"
)
func init() {
// Register the MetricSetFactory function for the "status" MetricSet.
if err := mb.Registry.AddMetricSet("someapp", "status", NewMetricSet); err != nil {
panic(err)
}
}
type MetricSet struct {
mb.BaseMetricSet
username string
password string
}
func NewMetricSet(base mb.BaseMetricSet) (mb.MetricSet, error) {
// Unpack additional configuration options.
config := struct {
Username string `config:"username"`
Password string `config:"password"`
}{
Username: "",
Password: "",
}
if err := base.Module().UnpackConfig(&config); err != nil {
return nil, err
}
return &MetricSet{
BaseMetricSet: base,
username: config.Username,
password: config.Password,
}, nil
}
func (ms *MetricSet) Fetch() (common.MapStr, error) {
// Fetch data from host and return the data.
return common.MapStr{
"someParam": "value",
"otherParam": 42,
}, nil
}
// ExampleMetricSetFactory demonstrates how to register a MetricSetFactory
// and unpack additional configuration data.
func main() {}
Output:
type Module ¶
type Module interface {
Name() string // Name returns the name of the Module.
Config() ModuleConfig // Config returns the ModuleConfig used to create the Module.
UnpackConfig(to interface{}) error // UnpackConfig unpacks the raw module config to the given object.
}
Module is the common interface for all Module implementations.
type ModuleConfig ¶
type ModuleConfig struct {
Hosts []string `config:"hosts"`
Period time.Duration `config:"period" validate:"positive"`
Timeout time.Duration `config:"timeout" validate:"positive"`
Module string `config:"module" validate:"required"`
MetricSets []string `config:"metricsets" validate:"required"`
Enabled bool `config:"enabled"`
Filters processors.PluginConfig `config:"filters"`
common.EventMetadata `config:",inline"` // Fields and tags to add to events.
}
ModuleConfig is the base configuration data for all Modules.
func DefaultModuleConfig ¶
func DefaultModuleConfig() ModuleConfig
DefaultModuleConfig returns a ModuleConfig with the default values populated.
type ModuleFactory ¶
type ModuleFactory func(base BaseModule) (Module, error)
ModuleFactory accepts a BaseModule and returns a Module. If there was an error creating the Module then an error will be returned.
Example ¶
ExampleModuleFactory demonstrates how to register a custom ModuleFactory and unpack additional configuration data.
package main
import (
"github.com/elastic/beats/metricbeat/mb"
)
func init() {
// Register the ModuleFactory function for the "example" module.
if err := mb.Registry.AddModule("example", NewModule); err != nil {
panic(err)
}
}
type Module struct {
mb.BaseModule
Protocol string
}
func NewModule(base mb.BaseModule) (mb.Module, error) {
// Unpack additional configuration options.
config := struct {
Protocol string `config:"protocol"`
}{
Protocol: "udp",
}
if err := base.UnpackConfig(&config); err != nil {
return nil, err
}
return &Module{BaseModule: base, Protocol: config.Protocol}, nil
}
// ExampleModuleFactory demonstrates how to register a custom ModuleFactory
// and unpack additional configuration data.
func main() {}
Output:
type Register ¶
type Register struct {
// contains filtered or unexported fields
}
Register contains the factory functions for creating new Modules and new MetricSets.
func (*Register) AddMetricSet ¶
func (r *Register) AddMetricSet(module string, name string, factory MetricSetFactory) error
AddMetricSet registers a new MetricSetFactory. An error is returned if any parameter is empty or nil or if a factory has already been registered under the name.
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