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relabel.go
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relabel.go
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package relabel
import (
"context"
"sync"
"github.com/grafana/agent/component"
flow_relabel "github.com/grafana/agent/component/common/relabel"
"github.com/grafana/agent/component/discovery"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/model/relabel"
)
func init() {
component.Register(component.Registration{
Name: "discovery.relabel",
Args: Arguments{},
Exports: Exports{},
Build: func(opts component.Options, args component.Arguments) (component.Component, error) {
return New(opts, args.(Arguments))
},
})
}
// Arguments holds values which are used to configure the discovery.relabel component.
type Arguments struct {
// Targets contains the input 'targets' passed by a service discovery component.
Targets []discovery.Target `river:"targets,attr"`
// The relabelling rules to apply to each target's label set.
RelabelConfigs []*flow_relabel.Config `river:"rule,block,optional"`
}
// Exports holds values which are exported by the discovery.relabel component.
type Exports struct {
Output []discovery.Target `river:"output,attr"`
Rules flow_relabel.Rules `river:"rules,attr"`
}
// Component implements the discovery.relabel component.
type Component struct {
opts component.Options
mut sync.RWMutex
rcs []*relabel.Config
}
var _ component.Component = (*Component)(nil)
// New creates a new discovery.relabel component.
func New(o component.Options, args Arguments) (*Component, error) {
c := &Component{opts: o}
// Call to Update() to set the output once at the start
if err := c.Update(args); err != nil {
return nil, err
}
return c, nil
}
// Run implements component.Component.
func (c *Component) Run(ctx context.Context) error {
<-ctx.Done()
return nil
}
// Update implements component.Component.
func (c *Component) Update(args component.Arguments) error {
c.mut.Lock()
defer c.mut.Unlock()
newArgs := args.(Arguments)
targets := make([]discovery.Target, 0, len(newArgs.Targets))
relabelConfigs := flow_relabel.ComponentToPromRelabelConfigs(newArgs.RelabelConfigs)
c.rcs = relabelConfigs
for _, t := range newArgs.Targets {
lset := componentMapToPromLabels(t)
lset, keep := relabel.Process(lset, relabelConfigs...)
if keep {
targets = append(targets, promLabelsToComponent(lset))
}
}
c.opts.OnStateChange(Exports{
Output: targets,
Rules: newArgs.RelabelConfigs,
})
return nil
}
func componentMapToPromLabels(ls discovery.Target) labels.Labels {
res := make([]labels.Label, 0, len(ls))
for k, v := range ls {
res = append(res, labels.Label{Name: k, Value: v})
}
return res
}
func promLabelsToComponent(ls labels.Labels) discovery.Target {
res := make(map[string]string, len(ls))
for _, l := range ls {
res[l.Name] = l.Value
}
return res
}