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kubernetes.go
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kubernetes.go
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// Package kubernetes implements a discovery.kubernetes component.
package kubernetes
import (
"github.com/grafana/agent/component"
"github.com/grafana/agent/component/common/config"
"github.com/grafana/agent/component/discovery"
promk8s "github.com/prometheus/prometheus/discovery/kubernetes"
)
func init() {
component.Register(component.Registration{
Name: "discovery.kubernetes",
Args: Arguments{},
Exports: discovery.Exports{},
Build: func(opts component.Options, args component.Arguments) (component.Component, error) {
return New(opts, args.(Arguments))
},
})
}
// Arguments configures the discovery.kubernetes component.
type Arguments struct {
APIServer config.URL `river:"api_server,attr,optional"`
Role string `river:"role,attr"`
KubeConfig string `river:"kubeconfig_file,attr,optional"`
HTTPClientConfig config.HTTPClientConfig `river:",squash"`
NamespaceDiscovery NamespaceDiscovery `river:"namespaces,block,optional"`
Selectors []SelectorConfig `river:"selectors,block,optional"`
AttachMetadata AttachMetadataConfig `river:"attach_metadata,block,optional"`
}
// DefaultConfig holds defaults for SDConfig.
var DefaultConfig = Arguments{
HTTPClientConfig: config.DefaultHTTPClientConfig,
}
// SetToDefault implements river.Defaulter.
func (args *Arguments) SetToDefault() {
*args = DefaultConfig
}
// Validate implements river.Validator.
func (args *Arguments) Validate() error {
// We must explicitly Validate because HTTPClientConfig is squashed and it won't run otherwise
return args.HTTPClientConfig.Validate()
}
// Convert converts Arguments to the Prometheus SD type.
func (args *Arguments) Convert() *promk8s.SDConfig {
selectors := make([]promk8s.SelectorConfig, len(args.Selectors))
for i, s := range args.Selectors {
selectors[i] = *s.convert()
}
return &promk8s.SDConfig{
APIServer: args.APIServer.Convert(),
Role: promk8s.Role(args.Role),
KubeConfig: args.KubeConfig,
HTTPClientConfig: *args.HTTPClientConfig.Convert(),
NamespaceDiscovery: *args.NamespaceDiscovery.convert(),
Selectors: selectors,
AttachMetadata: *args.AttachMetadata.convert(),
}
}
// NamespaceDiscovery configures filtering rules for which namespaces to discover.
type NamespaceDiscovery struct {
IncludeOwnNamespace bool `river:"own_namespace,attr,optional"`
Names []string `river:"names,attr,optional"`
}
func (nd *NamespaceDiscovery) convert() *promk8s.NamespaceDiscovery {
return &promk8s.NamespaceDiscovery{
IncludeOwnNamespace: nd.IncludeOwnNamespace,
Names: nd.Names,
}
}
// SelectorConfig configures selectors to filter resources to discover.
type SelectorConfig struct {
Role string `river:"role,attr"`
Label string `river:"label,attr,optional"`
Field string `river:"field,attr,optional"`
}
func (sc *SelectorConfig) convert() *promk8s.SelectorConfig {
return &promk8s.SelectorConfig{
Role: promk8s.Role(sc.Role),
Label: sc.Label,
Field: sc.Field,
}
}
type AttachMetadataConfig struct {
Node bool `river:"node,attr,optional"`
}
func (am *AttachMetadataConfig) convert() *promk8s.AttachMetadataConfig {
return &promk8s.AttachMetadataConfig{
Node: am.Node,
}
}
// New returns a new instance of a discovery.kubernetes component.
func New(opts component.Options, args Arguments) (*discovery.Component, error) {
return discovery.New(opts, args, func(args component.Arguments) (discovery.Discoverer, error) {
newArgs := args.(Arguments)
return promk8s.New(opts.Logger, newArgs.Convert())
})
}