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main.go
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main.go
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"github.com/sensu-community/sensu-plugin-sdk/sensu"
"github.com/sensu/sensu-go/types"
)
// Config represents the mutator plugin config.
type Config struct {
sensu.PluginConfig
ApiUrl string
ApiKey string
Labels map[string]string
Annotations map[string]string
AddLabels bool
AddAnnotations bool
AddAll bool
}
var (
plugin = Config{
PluginConfig: sensu.PluginConfig{
Name: "sensu-dynamic-event-mutator",
Short: "mutator for dynamically updating sensu event labels and annotations based on sensu entity",
Keyspace: "sensu.io/plugins/sensu-dynamic-event-mutator/config",
},
}
options = []*sensu.PluginConfigOption{
{
Path: "api-url",
Env: "SENSU_API_URL",
Argument: "api-url",
Shorthand: "a",
Default: "http://127.0.0.1:8080",
Usage: "Sensu API URL",
Value: &plugin.ApiUrl,
},
{
Path: "api-key",
Env: "SENSU_API_KEY",
Argument: "api-key",
Shorthand: "k",
Default: "",
Secret: true,
Usage: "Sensu API Key",
Value: &plugin.ApiKey,
},
{
Path: "",
Env: "",
Argument: "add-labels",
Shorthand: "",
Default: false,
Usage: "Mutates event.Entity.Labels based on entity.Labels",
Value: &plugin.AddLabels,
},
{
Path: "",
Env: "",
Argument: "add-annotations",
Shorthand: "",
Default: false,
Usage: "Mutates event.Entity.Annotations based on entity.Annotations",
Value: &plugin.AddAnnotations,
},
{
Path: "",
Env: "",
Argument: "add-all",
Shorthand: "",
Default: false,
Usage: "Mutates event.Entity.Labels based on entity.Labels and event.Entity.Annotations based on entity.Annotations",
Value: &plugin.AddAll,
},
}
)
func main() {
mutator := sensu.NewGoMutator(&plugin.PluginConfig, options, checkArgs, executeMutator)
mutator.Execute()
}
func checkArgs(event *types.Event) error {
if len(os.Getenv("SENSU_API_URL")) > 0 {
plugin.ApiUrl = os.Getenv("SENSU_API_URL")
}
if len(os.Getenv("SENSU_API_KEY")) > 0 {
plugin.ApiKey = os.Getenv("SENSU_API_KEY")
}
if len(plugin.ApiKey) == 0 || len(plugin.ApiUrl) == 0 {
return fmt.Errorf("--api-url and --api-key or enviornment variables $SENSU_API_URL and $SENSU_API_KEY are required!")
}
entityMetadata := getEntityMetadata(event)
if plugin.AddLabels {
fmt.Printf("Adding labels from \"entity.Labels\"\n")
plugin.Labels = addLabels(entityMetadata)
}
if plugin.AddAnnotations {
fmt.Printf("Adding annotations from \"entity.Annotations\"\n")
plugin.Annotations = addAnnotations(entityMetadata)
}
if plugin.AddAll {
fmt.Printf("Adding labels from \"entity.Labels\" and Adding annotations from \"entity.Annotations\"\n")
plugin.Labels = addLabels(entityMetadata)
plugin.Annotations = addAnnotations(entityMetadata)
}
return nil
}
func handleError(message string, err error) {
fmt.Printf("%s: %s\n", message, err)
os.Exit(1)
}
func getEntityMetadata(event *types.Event) map[string]interface{} {
namespace, entityName := "default", event.Entity.Name
url := fmt.Sprintf("%s/api/core/v2/namespaces/%s/entities/%s", os.Getenv("SENSU_API_URL"), namespace, entityName)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
handleError("Error creating request", err)
}
req.Header.Add("Authorization", "Key "+os.Getenv("SENSU_API_KEY"))
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
handleError("Error making request", err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
handleError("Error reading response body", err)
}
var entityInfo map[string]json.RawMessage
err = json.Unmarshal(body, &entityInfo)
if err != nil {
handleError("Error parsing JSON response", err)
}
var entityMetadata map[string]interface{}
err = json.Unmarshal(entityInfo["metadata"], &entityMetadata)
if err != nil {
handleError("Error extracting metadata from response", err)
}
return entityMetadata
}
func addLabels(entityMetadata map[string]interface{}) map[string]string {
labels, ok := entityMetadata["labels"].(map[string]interface{})
if !ok {
handleError("Error extracting labels from metadata", fmt.Errorf("labels field not found"))
}
jsonLabels, err := json.Marshal(labels)
if err != nil {
handleError("Error encoding labels to JSON", err)
}
var entityLabels map[string]string
err = json.Unmarshal([]byte(jsonLabels), &entityLabels)
if err != nil {
handleError("Error decoding labels from JSON", err)
}
return entityLabels
}
func addAnnotations(entityMetadata map[string]interface{}) map[string]string {
annotations, ok := entityMetadata["annotations"].(map[string]interface{})
if !ok {
handleError("Error extracting Annotations from metadata", fmt.Errorf("labels field not found"))
}
jsonAnnotations, err := json.Marshal(annotations)
if err != nil {
handleError("Error encoding Annotations to JSON", err)
}
var entityAnnotations map[string]string
err = json.Unmarshal([]byte(jsonAnnotations), &entityAnnotations)
if err != nil {
handleError("Error decoding Annotations from JSON", err)
}
return entityAnnotations
}
func executeMutator(event *types.Event) (*types.Event, error) {
if plugin.AddLabels {
event.Entity.Labels = plugin.Labels
}
if plugin.AddAnnotations {
event.Entity.Annotations = plugin.Annotations
}
if plugin.AddAll {
event.Entity.Labels = plugin.Labels
event.Entity.Annotations = plugin.Annotations
}
return event, nil
}