yanic/output/prometheus-sd/output.go

94 lines
1.8 KiB
Go

package prometheus_sd
import (
"errors"
"github.com/FreifunkBremen/yanic/output"
"github.com/FreifunkBremen/yanic/runtime"
)
type Output struct {
output.Output
path string
targetType TargetAddressType
labels map[string]interface{}
}
type Config map[string]interface{}
func (c Config) Path() string {
if path, ok := c["path"]; ok {
return path.(string)
}
return ""
}
type TargetAddressType string
const (
TargetAddressIP TargetAddressType = "ip"
TargetAddressNodeID TargetAddressType = "node_id"
)
func (c Config) TargetAddress() TargetAddressType {
if v, ok := c["target_address"]; ok {
return TargetAddressType(v.(string))
}
return TargetAddressIP
}
func (c Config) Labels() map[string]interface{} {
if v, ok := c["labels"]; ok {
return v.(map[string]interface{})
}
return nil
}
func init() {
output.RegisterAdapter("prometheus-sd", Register)
}
func Register(configuration map[string]interface{}) (output.Output, error) {
config := Config(configuration)
if path := config.Path(); path != "" {
return &Output{
path: path,
targetType: config.TargetAddress(),
labels: config.Labels(),
}, nil
}
return nil, errors.New("no path given")
}
type Targets struct {
Targets []string `json:"targets"`
Labels map[string]interface{} `json:"labels,omitempty"`
}
func (o *Output) Save(nodes *runtime.Nodes) {
nodes.RLock()
defer nodes.RUnlock()
targets := &Targets{
Targets: []string{},
Labels: o.labels,
}
if o.targetType == TargetAddressNodeID {
for _, n := range nodes.List {
if ni := n.Nodeinfo; ni != nil {
targets.Targets = append(targets.Targets, ni.NodeID)
}
}
} else {
for _, n := range nodes.List {
if addr := n.Address; addr != nil {
targets.Targets = append(targets.Targets, addr.IP.String())
}
}
}
runtime.SaveJSON([]interface{}{targets}, o.path)
}