thresholds and value formatters

src/models/options.ts

@@ -1,4 +1,5 @@
-import { PanelOptions, Aggregation } from 'types';
+import _ from 'lodash';
+import { PanelOptions, Aggregation, Threshold } from 'types';
 
 import { filterMetricListByAlias, getAggregatedValueFromSerie } from '../utils';
 
@@ -6,64 +7,82 @@ import { filterMetricListByAlias, getAggregatedValueFromSerie } from '../utils';
 export class Options {
   private minValue: number | undefined;
   private maxValue: number | undefined;
+  private thresholds: { value: number, color: string }[] = [];
 
   constructor(private grafanaSeriesList: any[], private grafanaOptions: PanelOptions) {
     this._setMin();
     this._setMax();
+    this._setThresholds();
   }
 
-  private _setMin(): any {
-    if (!this.grafanaOptions.gauge.min.metricName) {
+  private _setMin(): void {
+    if (!this.grafanaOptions.gauge.min.useMetric) {
       this.minValue = this.grafanaOptions.gauge.min.value;
       return;
     }
-    const filteredSeries = filterMetricListByAlias(
-      this.grafanaSeriesList,
-      this.grafanaOptions.gauge.min.metricName,
-      'Min'
-    );
-    const serie = filteredSeries[0];
-    // Last value for now
-    const aggregatedValue = getAggregatedValueFromSerie(serie, Aggregation.LAST);
+    const aggregatedValue = this.getLastValueFromMetrics(this.grafanaOptions.gauge.min.metricName, 'Min');
     this.minValue = aggregatedValue ? aggregatedValue : undefined;
   }
 
-  private _setMax(): any {
-    if (!this.grafanaOptions.gauge.max.metricName) {
+  private _setMax(): void {
+    if (!this.grafanaOptions.gauge.max.useMetric) {
       this.maxValue = this.grafanaOptions.gauge.max.value;
       return;
     }
-    const filteredSeries = filterMetricListByAlias(
-      this.grafanaSeriesList,
-      this.grafanaOptions.gauge.max.metricName,
-      'Max'
-    );
-    const serie = filteredSeries[0];
-    // Last value for now
-    const aggregatedValue = getAggregatedValueFromSerie(serie, Aggregation.LAST);
+    const aggregatedValue = this.getLastValueFromMetrics(this.grafanaOptions.gauge.max.metricName, 'Max');
     this.maxValue = aggregatedValue ? aggregatedValue : undefined;
   }
 
+  private _setThresholds(): void {
+    if (_.isEmpty(this.grafanaOptions.gauge.thresholds.thresholds)) {
+      return;
+    }
+    for (let [idx, threshold] of this.grafanaOptions.gauge.thresholds.thresholds.entries()) {
+      this._setThreshold(threshold, idx);
+    }
+  }
+
+  private _setThreshold(threshold: Threshold, idx: number): void {
+    const value = threshold.useMetric ? this.getLastValueFromMetrics(threshold.metricName, `Threshold ${idx}`) : threshold.value;
+    if(value === null || value === undefined) {
+      // TODO: may be throw an error
+      return;
+    }
+    this.thresholds.push({
+      value,
+      color: threshold.color
+    });
+  }
+
+  private _valueFormatter(value: number): string {
+    const decimals = this.grafanaOptions.gauge.decimals || 2;
+    return `${value.toFixed(decimals)} ${this.grafanaOptions.gauge.unit}`;
+  }
+
   getChartwerkOptions(): any {
     console.log('opt', this.maxValue, this.minValue);
     return {
       maxValue: this.maxValue,
       minValue: this.minValue,
-      valueFormatter: (val: any) => val.toFixed(2),
-      defaultColor: 'green',
+      valueFormatter: (val: number) => this._valueFormatter(val),
+      defaultColor: this.grafanaOptions.gauge.thresholds.defaultColor,
+      valueArcBackgroundColor: this.grafanaOptions.gauge.thresholds.arcBackground,
       reversed: this.grafanaOptions.gauge.reversed,
-      stops: [
-        {
-          color: 'green',
-          value: 100,
-        },
-        {
-          color: 'orange',
-          value: 140,
-        },
-      ],
+      stops: this.thresholds,
+      valueFontSize: this.grafanaOptions.gauge.valueSize,
       // @ts-ignore
       icons: [{ src: 'https://cityhost.ua/upload_img/blog5ef308ea5529c_trash2-01.jpg', position: 'middle', size: 30 }],
     };
   }
+
+  getLastValueFromMetrics(metricName: string | undefined, optionName: string): number | null {
+    const filteredSeries = filterMetricListByAlias(
+      this.grafanaSeriesList,
+      metricName,
+      optionName
+    );
+    const serie = filteredSeries[0];
+    // Last value for now
+    return getAggregatedValueFromSerie(serie, Aggregation.LAST);
+  }
 }

src/module.ts

@@ -87,7 +87,7 @@ export const plugin = new PanelPlugin<PanelOptions>(Panel).setPanelOptions((buil
       showIf: (config) => config.visualizationType === Pod.GAUGE,
     })
     .addSliderInput({
-      path: 'gauge.size',
+      path: 'gauge.valueSize',
       defaultValue: 20,
       name: 'Size (px)',
       settings: {

src/types.ts

@@ -4,7 +4,15 @@ export interface PanelOptions {
     min: ExtremumOptions;
     max: ExtremumOptions;
     value: ExtremumOptions;
+    valueSize: number;
     reversed: boolean;
+    decimals?: number;
+    unit?: string; 
+    thresholds: {
+      arcBackground: string;
+      defaultColor: string;
+      thresholds: Threshold[];
+    }
   };
 }
 
@@ -35,3 +43,10 @@ export enum Aggregation {
   MAX = 'max',
   LAST = 'last',
 }
+
+export type Threshold = {
+  useMetric: boolean;
+  value: number;
+  metricName: string;
+  color: string;
+}