Batch click stats updates through a Redis stream cron

apps/web/app/(ee)/api/cron/streams/update-click-stats/route.ts

@@ -0,0 +1,389 @@
+import { qstash } from "@/lib/cron";
+import { withCron } from "@/lib/cron/with-cron";
+import { conn } from "@/lib/planetscale";
+import { redis } from "@/lib/upstash/redis";
+import {
+  ClickStatsEvent,
+  clickStatsStream,
+} from "@/lib/upstash/redis-streams/click-stats";
+import { RedisStreamEntry } from "@/lib/upstash/redis-streams/client";
+import { APP_DOMAIN_WITH_NGROK, log } from "@dub/utils";
+import { format } from "date-fns";
+import { NextResponse } from "next/server";
+import { logAndRespond } from "../../utils";
+
+export const dynamic = "force-dynamic";
+
+const BATCH_SIZE = 10_000; // Max stream entries to consume per cron run
+const SUB_BATCH_SIZE = 50; // DB updates to run in parallel within each batch
+const BACKLOG_ALERT_THRESHOLD = 50_000; // Alert when stream length exceeds this
+const BACKLOG_AGE_ALERT_MS = 5 * 60 * 1000; // Alert when oldest pending entry is older than 5 minutes
+const LOCK_KEY = "lock:update-click-stats"; // Prevents concurrent GET/POST from double-counting
+const LOCK_TTL_SECONDS = 600; // ≥ cron maxDuration (600s) so lock outlives a running invocation
+
+type LinkAggregate = {
+  linkId: string;
+  clicks: number;
+  lastClicked: number;
+  entryIds: string[];
+};
+
+type WorkspaceAggregate = {
+  workspaceId: string;
+  clicks: number;
+};
+
+type EnrollmentAggregate = {
+  programId: string;
+  partnerId: string;
+  clicks: number;
+};
+
+const aggregateClickStats = (
+  entries: RedisStreamEntry<ClickStatsEvent>[],
+): {
+  linkUpdates: LinkAggregate[];
+  workspaceUpdates: WorkspaceAggregate[];
+  enrollmentUpdates: EnrollmentAggregate[];
+} => {
+  const links = new Map<string, LinkAggregate>();
+  const workspaces = new Map<string, WorkspaceAggregate>();
+  const enrollments = new Map<string, EnrollmentAggregate>();
+
+  for (const entry of entries) {
+    const { linkId, workspaceId, programId, partnerId, timestamp } = entry.data;
+
+    if (!linkId) {
+      continue;
+    }
+
+    const parsedTimestamp = Date.parse(timestamp);
+    const lastClicked = Number.isFinite(parsedTimestamp)
+      ? parsedTimestamp
+      : Date.now();
+
+    const existingLink = links.get(linkId);
+    if (existingLink) {
+      existingLink.clicks += 1;
+      existingLink.lastClicked = Math.max(
+        existingLink.lastClicked,
+        lastClicked,
+      );
+      existingLink.entryIds.push(entry.id);
+    } else {
+      links.set(linkId, {
+        linkId,
+        clicks: 1,
+        lastClicked,
+        entryIds: [entry.id],
+      });
+    }
+
+    if (workspaceId) {
+      const existingWorkspace = workspaces.get(workspaceId);
+      if (existingWorkspace) {
+        existingWorkspace.clicks += 1;
+      } else {
+        workspaces.set(workspaceId, {
+          workspaceId,
+          clicks: 1,
+        });
+      }
+    }
+
+    if (programId && partnerId) {
+      const key = `${programId}:${partnerId}`;
+      const existingEnrollment = enrollments.get(key);
+      if (existingEnrollment) {
+        existingEnrollment.clicks += 1;
+      } else {
+        enrollments.set(key, {
+          programId,
+          partnerId,
+          clicks: 1,
+        });
+      }
+    }
+  }
+
+  return {
+    linkUpdates: Array.from(links.values()),
+    workspaceUpdates: Array.from(workspaces.values()),
+    enrollmentUpdates: Array.from(enrollments.values()),
+  };
+};
+
+const processInSubBatches = async <T>(
+  items: T[],
+  handler: (item: T) => Promise<{ success: boolean; error?: unknown }>,
+) => {
+  const errors: unknown[] = [];
+  let totalProcessed = 0;
+
+  for (let i = 0; i < items.length; i += SUB_BATCH_SIZE) {
+    const batch = items.slice(i, i + SUB_BATCH_SIZE);
+    const results = await Promise.allSettled(batch.map(handler));
+
+    for (const result of results) {
+      if (result.status === "fulfilled" && result.value.success) {
+        totalProcessed++;
+      } else if (result.status === "fulfilled" && result.value.error) {
+        errors.push(result.value.error);
+      } else if (result.status === "rejected") {
+        errors.push(result.reason);
+      }
+    }
+  }
+
+  return { totalProcessed, errors };
+};
+
+const getStreamEntryAgeMs = (entryId: string | null) => {
+  if (!entryId) {
+    return null;
+  }
+
+  const timestampMs = Number(entryId.split("-")[0]);
+  if (!Number.isFinite(timestampMs)) {
+    return null;
+  }
+
+  return Date.now() - timestampMs;
+};
+
+const processClickStatsStreamBatch = () =>
+  clickStatsStream.processBatch<ClickStatsEvent>(
+    async (entries) => {
+      if (!entries || entries.length === 0) {
+        return {
+          success: true,
+          linkUpdates: [],
+          workspaceUpdates: [],
+          enrollmentUpdates: [],
+          processedEntryIds: [],
+          totalProcessed: 0,
+          errors: [],
+        };
+      }
+
+      console.log(`Aggregating ${entries.length} click stats events`);
+
+      const { linkUpdates, workspaceUpdates, enrollmentUpdates } =
+        aggregateClickStats(entries);
+
+      if (linkUpdates.length === 0) {
+        console.log("No click stats updates to process");
+        return {
+          success: true,
+          linkUpdates: [],
+          workspaceUpdates: [],
+          enrollmentUpdates: [],
+          processedEntryIds: entries.map((entry) => entry.id),
+          totalProcessed: 0,
+          errors: [],
+        };
+      }
+
+      console.log(
+        `Processing ${linkUpdates.length} link, ${workspaceUpdates.length} workspace, ${enrollmentUpdates.length} enrollment click stats updates...`,
+      );
+
+      const processedEntryIds: string[] = [];
+      const errors: unknown[] = [];
+
+      const linkResult = await processInSubBatches(
+        linkUpdates,
+        async (update) => {
+          try {
+            await conn.execute(
+              "UPDATE Link SET clicks = clicks + ?, lastClicked = ? WHERE id = ?",
+              [
+                update.clicks,
+                format(new Date(update.lastClicked), "yyyy-MM-dd HH:mm:ss"),
+                update.linkId,
+              ],
+            );
+            processedEntryIds.push(...update.entryIds);
+            return { success: true };
+          } catch (error) {
+            console.error(`Failed to update link ${update.linkId}:`, error);
+            return {
+              success: false,
+              error: { linkId: update.linkId, error },
+            };
+          }
+        },
+      );
+      errors.push(...linkResult.errors);
+
+      const workspaceResult = await processInSubBatches(
+        workspaceUpdates,
+        async (update) => {
+          try {
+            await conn.execute(
+              "UPDATE Project SET usage = usage + ?, totalClicks = totalClicks + ? WHERE id = ?",
+              [update.clicks, update.clicks, update.workspaceId],
+            );
+            return { success: true };
+          } catch (error) {
+            console.error(
+              `Failed to update workspace ${update.workspaceId}:`,
+              error,
+            );
+            return {
+              success: false,
+              error: { workspaceId: update.workspaceId, error },
+            };
+          }
+        },
+      );
+      errors.push(...workspaceResult.errors);
+
+      const enrollmentResult = await processInSubBatches(
+        enrollmentUpdates,
+        async (update) => {
+          try {
+            await conn.execute(
+              "UPDATE ProgramEnrollment SET totalClicks = totalClicks + ? WHERE programId = ? AND partnerId = ?",
+              [update.clicks, update.programId, update.partnerId],
+            );
+            return { success: true };
+          } catch (error) {
+            console.error(
+              `Failed to update program enrollment ${update.programId}:${update.partnerId}:`,
+              error,
+            );
+            return {
+              success: false,
+              error: {
+                programId: update.programId,
+                partnerId: update.partnerId,
+                error,
+              },
+            };
+          }
+        },
+      );
+      errors.push(...enrollmentResult.errors);
+
+      const totalProcessed =
+        linkResult.totalProcessed +
+        workspaceResult.totalProcessed +
+        enrollmentResult.totalProcessed;
+
+      console.log(
+        `Processed ${linkResult.totalProcessed}/${linkUpdates.length} links, ${workspaceResult.totalProcessed}/${workspaceUpdates.length} workspaces, ${enrollmentResult.totalProcessed}/${enrollmentUpdates.length} enrollments`,
+      );
+
+      if (errors.length > 0) {
+        console.error(
+          `Encountered ${errors.length} errors while processing click stats:`,
+          errors.slice(0, 5),
+        );
+      }
+
+      return {
+        linkUpdates,
+        workspaceUpdates,
+        enrollmentUpdates,
+        errors,
+        totalProcessed,
+        processedEntryIds,
+        entriesProcessed: entries.length,
+      };
+    },
+    {
+      count: BATCH_SIZE,
+      deleteAfterRead: true,
+    },
+  );
+
+const maybeAlertOnBacklog = async (streamInfo: {
+  length: number;
+  firstEntryId: string | null;
+}) => {
+  const ageMs = getStreamEntryAgeMs(streamInfo.firstEntryId);
+  const isBackloggedByLength = streamInfo.length > BACKLOG_ALERT_THRESHOLD;
+  const isBackloggedByAge =
+    ageMs !== null && ageMs > BACKLOG_AGE_ALERT_MS && streamInfo.length > 0;
+
+  if (!isBackloggedByLength && !isBackloggedByAge) {
+    return;
+  }
+
+  await log({
+    message: `Click stats stream backlog alert: length=${streamInfo.length}, oldestAgeMs=${ageMs ?? "unknown"}, firstEntryId=${streamInfo.firstEntryId ?? "none"}`,
+    type: "alerts",
+  });
+};
+
+const executeClickStatsCron = async () => {
+  const {
+    linkUpdates,
+    errors,
+    totalProcessed,
+    entriesProcessed = 0,
+  } = await processClickStatsStreamBatch();
+
+  const streamInfo = await clickStatsStream.getStreamInfo();
+  await maybeAlertOnBacklog(streamInfo);
+
+  const hasMore =
+    streamInfo.length > 0 || (entriesProcessed ?? 0) >= BATCH_SIZE;
+
+  if (hasMore) {
+    await qstash.publishJSON({
+      url: `${APP_DOMAIN_WITH_NGROK}/api/cron/streams/update-click-stats`,
+      method: "POST",
+      body: {},
+    });
+  }
+
+  if (!linkUpdates.length) {
+    return NextResponse.json({
+      success: true,
+      message: "No updates to process",
+      processed: 0,
+      streamInfo,
+      hasMore,
+    });
+  }
+
+  const response = {
+    success: true,
+    processed: totalProcessed,
+    errors: errors?.length || 0,
+    streamInfo,
+    hasMore,
+    message: `Successfully processed ${totalProcessed} click stats updates`,
+  };
+
+  console.log(response);
+
+  return NextResponse.json(response);
+};
+
+const runWithLock = async () => {
+  const acquired = await redis.set(LOCK_KEY, "1", {
+    nx: true,
+    ex: LOCK_TTL_SECONDS,
+  });
+
+  if (!acquired) {
+    return logAndRespond(
+      "[update-click-stats] Another run is in progress. Skipping...",
+    );
+  }
+
+  try {
+    return await executeClickStatsCron();
+  } finally {
+    await redis.del(LOCK_KEY);
+  }
+};
+
+// GET /api/cron/streams/update-click-stats
+export const GET = withCron(async () => runWithLock());
+
+// POST /api/cron/streams/update-click-stats (recursively called by QStash)
+export const POST = withCron(async () => runWithLock());