feat(api): Add healthz endpoint

indexer/api/api.go

@@ -70,6 +70,10 @@ func (a *Api) WithdrawalsHandler(w http.ResponseWriter, r *http.Request) {
 	jsonResponse(w, response, http.StatusOK)
 }
 
+func (a *Api) HealthzHandler(w http.ResponseWriter, r *http.Request) {
+	jsonResponse(w, "ok", http.StatusOK)
+}
+
 func jsonResponse(w http.ResponseWriter, data interface{}, statusCode int) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(statusCode)
@@ -95,6 +99,7 @@ func NewApi(bv database.BridgeView) *Api {
 	// with go-ethereum and throw a friendly error message
 	r.Get("/api/v0/deposits/{address:.+}", api.DepositsHandler)
 	r.Get("/api/v0/withdrawals/{address:.+}", api.WithdrawalsHandler)
+	r.Get("/healthz", api.HealthzHandler)
 
 	return api
 

indexer/api/api_test.go

@@ -44,6 +44,17 @@ func (mbv *MockBridgeView) WithdrawalsByAddress(address common.Address) ([]*data
 	}, nil
 }
 
+func TestHealthz(t *testing.T) {
+	api := NewApi(&MockBridgeView{})
+	request, err := http.NewRequest("GET", "/healthz", nil)
+	assert.Nil(t, err)
+
+	responseRecorder := httptest.NewRecorder()
+	api.Router.ServeHTTP(responseRecorder, request)
+
+	assert.Equal(t, http.StatusOK, responseRecorder.Code)
+}
+
 func TestDepositsHandler(t *testing.T) {
 	api := NewApi(&MockBridgeView{})
 	request, err := http.NewRequest("GET", "/api/v0/deposits/0x123", nil)