1 files changed, 109 insertions, 0 deletions
diff --git a/app/assets/javascripts/prometheus_metrics/prometheus_metrics.js b/app/assets/javascripts/prometheus_metrics/prometheus_metrics.js
new file mode 100644
index 00000000000..ef4d6df5138
--- /dev/null
+++ b/app/assets/javascripts/prometheus_metrics/prometheus_metrics.js
@@ -0,0 +1,109 @@
+import PANEL_STATE from './constants';
+
+export default class PrometheusMetrics {
+  constructor(wrapperSelector) {
+    this.backOffRequestCounter = 0;
+
+    this.$wrapper = $(wrapperSelector);
+
+    this.$monitoredMetricsPanel = this.$wrapper.find('.js-panel-monitored-metrics');
+    this.$monitoredMetricsCount = this.$monitoredMetricsPanel.find('.js-monitored-count');
+    this.$monitoredMetricsLoading = this.$monitoredMetricsPanel.find('.js-loading-metrics');
+    this.$monitoredMetricsEmpty = this.$monitoredMetricsPanel.find('.js-empty-metrics');
+    this.$monitoredMetricsList = this.$monitoredMetricsPanel.find('.js-metrics-list');
+
+    this.$missingEnvVarPanel = this.$wrapper.find('.js-panel-missing-env-vars');
+    this.$panelToggle = this.$missingEnvVarPanel.find('.js-panel-toggle');
+    this.$missingEnvVarMetricCount = this.$missingEnvVarPanel.find('.js-env-var-count');
+    this.$missingEnvVarMetricsList = this.$missingEnvVarPanel.find('.js-missing-var-metrics-list');
+
+    this.activeMetricsEndpoint = this.$monitoredMetricsPanel.data('active-metrics');
+
+    this.$panelToggle.on('click', e => this.handlePanelToggle(e));
+  }
+
+  /* eslint-disable class-methods-use-this */
+  handlePanelToggle(e) {
+    const $toggleBtn = $(e.currentTarget);
+    const $currentPanelBody = $toggleBtn.closest('.panel').find('.panel-body');
+    $currentPanelBody.toggleClass('hidden');
+    if ($toggleBtn.hasClass('fa-caret-down')) {
+      $toggleBtn.removeClass('fa-caret-down').addClass('fa-caret-right');
+    } else {
+      $toggleBtn.removeClass('fa-caret-right').addClass('fa-caret-down');
+    }
+  }
+
+  showMonitoringMetricsPanelState(stateName) {
+    switch (stateName) {
+      case PANEL_STATE.LOADING:
+        this.$monitoredMetricsLoading.removeClass('hidden');
+        this.$monitoredMetricsEmpty.addClass('hidden');
+        this.$monitoredMetricsList.addClass('hidden');
+        break;
+      case PANEL_STATE.LIST:
+        this.$monitoredMetricsLoading.addClass('hidden');
+        this.$monitoredMetricsEmpty.addClass('hidden');
+        this.$monitoredMetricsList.removeClass('hidden');
+        break;
+      default:
+        this.$monitoredMetricsLoading.addClass('hidden');
+        this.$monitoredMetricsEmpty.removeClass('hidden');
+        this.$monitoredMetricsList.addClass('hidden');
+        break;
+    }
+  }
+
+  populateActiveMetrics(metrics) {
+    let totalMonitoredMetrics = 0;
+    let totalMissingEnvVarMetrics = 0;
+
+    metrics.forEach((metric) => {
+      this.$monitoredMetricsList.append(`<li>${metric.group}<span class="badge">${metric.active_metrics}</span></li>`);
+      totalMonitoredMetrics += metric.active_metrics;
+      if (metric.metrics_missing_requirements > 0) {
+        this.$missingEnvVarMetricsList.append(`<li>${metric.group}</li>`);
+        totalMissingEnvVarMetrics += 1;
+      }
+    });
+
+    this.$monitoredMetricsCount.text(totalMonitoredMetrics);
+    this.showMonitoringMetricsPanelState(PANEL_STATE.LIST);
+
+    if (totalMissingEnvVarMetrics > 0) {
+      this.$missingEnvVarPanel.removeClass('hidden');
+      this.$missingEnvVarPanel.find('.flash-container').off('click');
+      this.$missingEnvVarMetricCount.text(totalMissingEnvVarMetrics);
+    }
+  }
+
+  loadActiveMetrics() {
+    this.showMonitoringMetricsPanelState(PANEL_STATE.LOADING);
+    gl.utils.backOff((next, stop) => {
+      $.getJSON(this.activeMetricsEndpoint)
+        .done((res) => {
+          if (res && res.success) {
+            stop(res);
+          } else {
+            this.backOffRequestCounter = this.backOffRequestCounter += 1;
+            if (this.backOffRequestCounter < 3) {
+              next();
+            } else {
+              stop(res);
+            }
+          }
+        })
+        .fail(stop);
+    })
+    .then((res) => {
+      if (res && res.data && res.data.length) {
+        this.populateActiveMetrics(res.data);
+      } else {
+        this.showMonitoringMetricsPanelState(PANEL_STATE.EMPTY);
+      }
+    })
+    .catch(() => {
+      this.showMonitoringMetricsPanelState(PANEL_STATE.EMPTY);
+    });
+  }
+}