(feature): API - Implement receiver/channel test functionality (#993)

* (feature): Added test receiver/channel functionality

pkg/query-service/app/http_handler.go

@@ -39,6 +39,7 @@ type APIHandler struct {
 	basePath     string
 	apiPrefix    string
 	reader       *Reader
+	alertManager am.Manager
 	relationalDB *interfaces.ModelDao
 	ready        func(http.HandlerFunc) http.HandlerFunc
 }
@@ -46,9 +47,11 @@ type APIHandler struct {
 // NewAPIHandler returns an APIHandler
 func NewAPIHandler(reader *Reader, relationalDB *interfaces.ModelDao) (*APIHandler, error) {
 
+	alertManager := am.New("")
 	aH := &APIHandler{
 		reader:       reader,
 		relationalDB: relationalDB,
+		alertManager: alertManager,
 	}
 	aH.ready = aH.testReady
 
@@ -172,6 +175,7 @@ func (aH *APIHandler) RegisterRoutes(router *mux.Router) {
 	router.HandleFunc("/api/v1/channels/{id}", aH.editChannel).Methods(http.MethodPut)
 	router.HandleFunc("/api/v1/channels/{id}", aH.deleteChannel).Methods(http.MethodDelete)
 	router.HandleFunc("/api/v1/channels", aH.createChannel).Methods(http.MethodPost)
+	router.HandleFunc("/api/v1/testChannel", aH.testChannel).Methods(http.MethodPost)
 	router.HandleFunc("/api/v1/rules", aH.listRulesFromProm).Methods(http.MethodGet)
 	router.HandleFunc("/api/v1/rules/{id}", aH.getRule).Methods(http.MethodGet)
 	router.HandleFunc("/api/v1/rules", aH.createRule).Methods(http.MethodPost)
@@ -451,6 +455,33 @@ func (aH *APIHandler) listChannels(w http.ResponseWriter, r *http.Request) {
 	aH.respond(w, channels)
 }
 
+// testChannels sends test alert to all registered channels
+func (aH *APIHandler) testChannel(w http.ResponseWriter, r *http.Request) {
+
+	defer r.Body.Close()
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		zap.S().Errorf("Error in getting req body of testChannel API\n", err)
+		aH.respondError(w, &model.ApiError{Typ: model.ErrorBadData, Err: err}, nil)
+		return
+	}
+
+	receiver := &am.Receiver{}
+	if err := json.Unmarshal(body, receiver); err != nil { // Parse []byte to go struct pointer
+		zap.S().Errorf("Error in parsing req body of testChannel API\n", err)
+		aH.respondError(w, &model.ApiError{Typ: model.ErrorBadData, Err: err}, nil)
+		return
+	}
+
+	// send alert
+	apiErrorObj := aH.alertManager.TestReceiver(receiver)
+	if apiErrorObj != nil {
+		aH.respondError(w, apiErrorObj, nil)
+		return
+	}
+	aH.respond(w, "test alert sent")
+}
+
 func (aH *APIHandler) editChannel(w http.ResponseWriter, r *http.Request) {
 
 	id := mux.Vars(r)["id"]

pkg/query-service/integrations/alertManager/manager.go

@@ -2,13 +2,14 @@ package alertManager
 
 // Wrapper to connect and process alert manager functions
 import (
-	"fmt" 
-	"encoding/json"
 	"bytes"
+	"encoding/json"
+	"fmt"
 	"net/http"
-	"go.uber.org/zap"
+
 	"go.signoz.io/query-service/constants"
 	"go.signoz.io/query-service/model"
+	"go.uber.org/zap"
 )
 
 const contentType = "application/json"
@@ -17,15 +18,16 @@ type Manager interface {
 	AddRoute(receiver *Receiver) *model.ApiError
 	EditRoute(receiver *Receiver) *model.ApiError
 	DeleteRoute(name string) *model.ApiError
+	TestReceiver(receiver *Receiver) *model.ApiError
 }
 
-func New(url string) Manager{
+func New(url string) Manager {
 
-	if url == ""{
+	if url == "" {
 		url = constants.GetAlertManagerApiPrefix()
 	}
 
-	return &manager {
+	return &manager{
 		url: url,
 	}
 }
@@ -34,7 +36,6 @@ type manager struct {
 	url string
 }
 
-
 func prepareAmChannelApiURL() string {
 	basePath := constants.GetAlertManagerApiPrefix()
 	AmChannelApiPath := constants.AmChannelApiPath
@@ -46,7 +47,12 @@ func prepareAmChannelApiURL() string {
 	return fmt.Sprintf("%s%s", basePath, AmChannelApiPath)
 }
 
-func (m *manager) AddRoute(receiver *Receiver) (*model.ApiError) {
+func prepareTestApiURL() string {
+	basePath := constants.GetAlertManagerApiPrefix()
+	return fmt.Sprintf("%s%s", basePath, "v1/testReceiver")
+}
+
+func (m *manager) AddRoute(receiver *Receiver) *model.ApiError {
 
 	receiverString, _ := json.Marshal(receiver)
 
@@ -125,5 +131,29 @@ func (m *manager) DeleteRoute(name string) *model.ApiError {
 	return nil
 }
 
+func (m *manager) TestReceiver(receiver *Receiver) *model.ApiError {
 
+	receiverBytes, _ := json.Marshal(receiver)
 
+	amTestURL := prepareTestApiURL()
+	response, err := http.Post(amTestURL, contentType, bytes.NewBuffer(receiverBytes))
+
+	if err != nil {
+		zap.S().Errorf(fmt.Sprintf("Error in getting response of API call to alertmanager(POST %s)\n", amTestURL), err)
+		return &model.ApiError{Typ: model.ErrorInternal, Err: err}
+	}
+
+	if response.StatusCode > 201 && response.StatusCode < 400 {
+		err := fmt.Errorf(fmt.Sprintf("Invalid parameters in test alert api for alertmanager(POST %s)\n", amTestURL), response.Status)
+		zap.S().Error(err)
+		return &model.ApiError{Typ: model.ErrorInternal, Err: err}
+	}
+
+	if response.StatusCode > 400 {
+		err := fmt.Errorf(fmt.Sprintf("Received Server Error response for API call to alertmanager(POST %s)\n", amTestURL), response.Status)
+		zap.S().Error(err)
+		return &model.ApiError{Typ: model.ErrorInternal, Err: err}
+	}
+
+	return nil
+}