Add notification dispatchers (P3 Slack/Email/Webhook, P5 Slack), full YAML parser for P6

- P3 alert: NotificationDispatcher with Slack Block Kit, Resend email, generic webhook; severity-gated dispatch - P5 cost: CostSlackNotifier with anomaly Block Kit (score, deviation, snooze/expected buttons) - P6 run: Full YAML runbook parser with serde_yaml, variable substitution ({{var}}), failure actions, 7 tests - P6 parser: validates non-empty steps, default timeout (300s), default abort on failure
2026-03-01 03:13:06 +00:00
parent f2e0a32cc7
commit 829e408e1e
3 changed files with 484 additions and 14 deletions
--- a/products/05-aws-cost-anomaly/src/notifications/slack.ts
+++ b/products/05-aws-cost-anomaly/src/notifications/slack.ts
@@ -0,0 +1,89 @@
+import pino from 'pino';
+
+const logger = pino({ name: 'cost-notifications' });
+
+export interface CostAnomalyNotification {
+  anomalyId: string;
+  accountId: string;
+  resourceType: string;
+  region: string;
+  hourlyCost: number;
+  score: number;
+  baselineMean: number;
+  baselineStddev: number;
+  dashboardUrl: string;
+}
+
+// --- Slack Block Kit for Cost Anomalies ---
+
+export class CostSlackNotifier {
+  private webhookUrl: string;
+
+  constructor(webhookUrl: string) {
+    this.webhookUrl = webhookUrl;
+  }
+
+  async send(anomaly: CostAnomalyNotification): Promise<boolean> {
+    const scoreEmoji = anomaly.score >= 75 ? '🔴' : anomaly.score >= 50 ? '🟠' : '🟡';
+    const deviation = anomaly.baselineStddev > 0
+      ? ((anomaly.hourlyCost - anomaly.baselineMean) / anomaly.baselineStddev).toFixed(1)
+      : '∞';
+
+    const blocks = [
+      {
+        type: 'header',
+        text: { type: 'plain_text', text: `${scoreEmoji} Cost Anomaly Detected`, emoji: true },
+      },
+      {
+        type: 'section',
+        fields: [
+          { type: 'mrkdwn', text: `*Resource:*\n\`${anomaly.resourceType}\`` },
+          { type: 'mrkdwn', text: `*Account:*\n${anomaly.accountId}` },
+          { type: 'mrkdwn', text: `*Region:*\n${anomaly.region}` },
+          { type: 'mrkdwn', text: `*Score:*\n${anomaly.score}/100` },
+          { type: 'mrkdwn', text: `*Hourly Cost:*\n$${anomaly.hourlyCost.toFixed(4)}` },
+          { type: 'mrkdwn', text: `*Baseline:*\n$${anomaly.baselineMean.toFixed(4)} ± ${anomaly.baselineStddev.toFixed(4)}` },
+          { type: 'mrkdwn', text: `*Deviation:*\n${deviation}σ` },
+        ],
+      },
+      {
+        type: 'actions',
+        elements: [
+          {
+            type: 'button',
+            text: { type: 'plain_text', text: '📊 View Details' },
+            url: anomaly.dashboardUrl,
+            action_id: `view_anomaly:${anomaly.anomalyId}`,
+          },
+          {
+            type: 'button',
+            text: { type: 'plain_text', text: '✅ Expected' },
+            action_id: `mark_expected:${anomaly.anomalyId}`,
+          },
+          {
+            type: 'button',
+            text: { type: 'plain_text', text: '😴 Snooze 24h' },
+            action_id: `snooze_anomaly:${anomaly.anomalyId}`,
+          },
+        ],
+      },
+    ];
+
+    try {
+      const res = await fetch(this.webhookUrl, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ blocks }),
+      });
+
+      if (!res.ok) {
+        logger.warn({ status: res.status, anomalyId: anomaly.anomalyId }, 'Slack cost notification failed');
+        return false;
+      }
+      return true;
+    } catch (err) {
+      logger.error({ error: (err as Error).message }, 'Slack cost send error');
+      return false;
+    }
+  }
+}