environment metrics handler (#319)

controller/metrics.go

@@ -71,6 +71,81 @@ func (h *getAccountMetricsHandler) Handle(params metadata.GetAccountMetricsParam
 	return metadata.NewGetAccountMetricsOK().WithPayload(response)
 }
 
+type getEnvironmentMetricsHandler struct {
+	cfg      *metrics.InfluxConfig
+	idb      influxdb2.Client
+	queryApi api.QueryAPI
+}
+
+func newGetEnvironmentMetricsHAndler(cfg *metrics.InfluxConfig) *getEnvironmentMetricsHandler {
+	idb := influxdb2.NewClient(cfg.Url, cfg.Token)
+	queryApi := idb.QueryAPI(cfg.Org)
+	return &getEnvironmentMetricsHandler{
+		cfg:      cfg,
+		idb:      idb,
+		queryApi: queryApi,
+	}
+}
+
+func (h *getEnvironmentMetricsHandler) Handle(params metadata.GetEnvironmentMetricsParams, principal *rest_model_zrok.Principal) middleware.Responder {
+	trx, err := str.Begin()
+	if err != nil {
+		logrus.Errorf("error starting transaction: %v", err)
+		return metadata.NewGetEnvironmentMetricsInternalServerError()
+	}
+	defer func() { _ = trx.Rollback() }()
+	env, err := str.GetEnvironment(int(params.EnvID), trx)
+	if err != nil {
+		logrus.Errorf("error finding environment '%d': %v", int(params.EnvID), err)
+		return metadata.NewGetEnvironmentMetricsUnauthorized()
+	}
+	if int64(env.Id) != principal.ID {
+		logrus.Errorf("unauthorized environemnt '%d' for '%v'", int(params.EnvID), principal.Email)
+		return metadata.NewGetEnvironmentMetricsUnauthorized()
+	}
+
+	duration := 30 * 24 * time.Hour
+	if params.Duration != nil {
+		v, err := time.ParseDuration(*params.Duration)
+		if err != nil {
+			logrus.Errorf("bad duration '%v' for '%v': %v", params.Duration, principal.Email, err)
+			return metadata.NewGetAccountMetricsBadRequest()
+		}
+		duration = v
+	}
+	slice := duration / 200
+
+	query := fmt.Sprintf("from(bucket: \"%v\")\n", h.cfg.Bucket) +
+		fmt.Sprintf("|> range(start: -%v)\n", duration) +
+		"|> filter(fn: (r) => r[\"_measurement\"] == \"xfer\")\n" +
+		"|> filter(fn: (r) => r[\"_field\"] == \"rx\" or r[\"_field\"] == \"tx\")\n" +
+		"|> filter(fn: (r) => r[\"namespace\"] == \"backend\")\n" +
+		fmt.Sprintf("|> filter(fn: (r) => r[\"envId\"] == \"%d\")\n", int64(env.Id)) +
+		"|> drop(columns: [\"share\", \"acctId\"])\n" +
+		fmt.Sprintf("|> aggregateWindow(every: %v, fn: sum, createEmpty: true)", slice)
+
+	rx, tx, timestamps, err := runFluxForRxTxArray(query, h.queryApi)
+	if err != nil {
+		logrus.Errorf("error running account metrics query for '%v': %v", principal.Email, err)
+		return metadata.NewGetAccountMetricsInternalServerError()
+	}
+
+	response := &rest_model_zrok.Metrics{
+		Scope:  "account",
+		ID:     fmt.Sprintf("%d", principal.ID),
+		Period: duration.Seconds(),
+	}
+	for i := 0; i < len(rx) && i < len(tx) && i < len(timestamps); i++ {
+		response.Samples = append(response.Samples, &rest_model_zrok.MetricsSample{
+			Rx:        rx[i],
+			Tx:        tx[i],
+			Timestamp: timestamps[i],
+		})
+	}
+
+	return metadata.NewGetEnvironmentMetricsOK().WithPayload(response)
+}
+
 func runFluxForRxTxArray(query string, queryApi api.QueryAPI) (rx, tx, timestamps []float64, err error) {
 	result, err := queryApi.Query(context.Background(), query)
 	if err != nil {