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FeedPulse

CI Smoke CodeQL Kubernetes Node License

FeedPulse is a multi-tenant RSS/Atom monitoring service. You register feeds and keyword rules; it polls each feed on its own schedule, deduplicates entries, matches them against your rules, and delivers one alert per article over webhook, email and Telegram.

Why it exists

It was built for a Hagalink project that had to monitor more than 10,000 RSS sources and alert on keyword matches across all of them.

Hosted readers do not solve that problem. They are priced per seat, they are built for a human reading a timeline, and keyword rules with multi-channel alerting are not what they are for. At that source count the cost stops tracking the value, and you still do not have an API to plug the matches into anything else.

So the requirement was specific: 10,000 feeds, on infrastructure we control, with alerting as a first-class output rather than a browser tab. That number is why the capacity benchmark tops out at exactly 10,000 feeds — it is the acceptance criterion, not a round figure chosen to look good. It is also why the architecture looks the way it does: three runtimes because the API, the scheduler and the fetching have unrelated load profiles, and queues because ten thousand fetches do not fit inside a request cycle.

The service was later folded into a wider platform. This repository is the standalone system.

It is also a portfolio codebase, so it is written to be read: ports and adapters where a seam earns its keep, raw SQL you can review, decisions recorded in ADRs, and every operational claim in this README verified against the code.

The PostgreSQL database is still named rss_monitor and the smoke/benchmark Compose projects are still rss-monitor-*. That is the project's original name, kept because renaming it would orphan existing volumes for zero functional gain.


Contents


Architecture

Three processes run from one image, sharing the same Nest module graph.

flowchart LR
    Client["API client<br/>/ dashboard"] --> API["api<br/>REST · Swagger · dashboard"]

    API --> PG[("PostgreSQL")]
    API --> REDIS[("Redis")]

    SCHED["scheduler<br/>claim · sweep · digests"] --> PG
    SCHED -->|"fetch-feed queue"| REDIS

    REDIS -->|"fetch-feed<br/>alert-delivery"| WORKER["worker<br/>fetch · match · deliver"]
    WORKER --> PG
    WORKER --> ORIGINS[["RSS / Atom origins"]]

    WORKER --> WH["Webhook notifier"]
    WORKER --> EM["Email — Resend"]
    WORKER --> TG["Telegram Bot API"]

    API -.->|"scrapes /metrics"| WORKER
Loading
Process Responsibility
api REST API, Swagger UI, static operator dashboard, health, readiness and merged metrics.
scheduler Timer loop: releases stranded claims, claims due feeds, enqueues fetch jobs, flushes digests.
worker Consumes four BullMQ queues; fetches, parses, matches, persists and delivers.

The layout is hexagonal where a seam buys something — FeedFetcherPort and AlertNotifierPort have real alternate implementations and test doubles — and plain otherwise. Repositories talk raw SQL directly, because PostgreSQL is not being swapped and the schema leans on features an ORM would make you escape-hatch around anyway.

Full detail, including the ingestion sequence and the ten modules: docs/architecture.md.


Quickstart

Requires Docker with docker compose, and Node.js 24 (the version in .nvmrc, and the floor package.json declares in engines) if you want to run the processes on the host.

Option A — the whole stack in Docker

git clone https://github.com/FullFran/feedpulse.git
cd feedpulse
cp .env.example .env
docker compose up -d --build

The api service runs node dist/scripts/migrate.js before starting, so migrations are applied for you and BOOTSTRAP_API_KEY is seeded into the api_keys table. Give it a moment on the first run — the readiness probe has a 90 second start period precisely because a cold start applies every migration first.

curl http://127.0.0.1:3000/health
curl -H "x-api-key: fp_bootstr_change-me-before-you-expose-this" \
     http://127.0.0.1:3000/api/v1/feeds

Change BOOTSTRAP_API_KEY in .env before exposing anything.

Option B — dependencies in Docker, processes on the host

Useful while developing, because you get a fast edit/restart loop.

git clone https://github.com/FullFran/feedpulse.git
cd feedpulse
npm ci
cp .env.example .env

docker compose up -d postgres redis

.env.example points DATABASE_URL at the Compose-internal hostname postgres, which the host cannot resolve. Override the two URLs with the published host ports — 55432 and 56379 by default — before running anything on the host:

export DATABASE_URL=postgres://postgres:postgres@127.0.0.1:55432/rss_monitor
export REDIS_URL=redis://127.0.0.1:56379
export NODE_ENV=development

npm run migrate         # applies db/migrations and seeds BOOTSTRAP_API_KEY
npm run start:api       # terminal 1
npm run start:scheduler # terminal 2
npm run start:worker    # terminal 3

Then register a feed and a rule:

KEY=fp_bootstr_change-me-before-you-expose-this

curl -X POST http://127.0.0.1:3000/api/v1/feeds \
  -H "x-api-key: $KEY" -H 'content-type: application/json' \
  -d '{"url":"https://example.com/rss.xml","poll_interval_seconds":1800}'

curl -X POST http://127.0.0.1:3000/api/v1/rules \
  -H "x-api-key: $KEY" -H 'content-type: application/json' \
  -d '{"name":"Grid outages","include_keywords":["power outage","São Paulo"],"exclude_keywords":["scheduled maintenance"]}'

Where to look

URL What it is
/health Liveness. Answers from process state alone.
/ready PostgreSQL, Redis and schema readiness. 503 when any fails.
/metrics Prometheus text format, API and worker registries merged.
/docs Swagger UI. Gated on ENABLE_SWAGGER.
/docs-json The OpenAPI document. Same flag.
/dashboard/ Static operator dashboard.

ENABLE_SWAGGER defaults to on outside production — but .env.example ships NODE_ENV=production and ENABLE_SWAGGER=false, so Option A answers 404 on /docs and /docs-json until you set ENABLE_SWAGGER=true in .env. Option B, which exports NODE_ENV=development, serves both. The same document is committed at docs/openapi.json either way.

Dashboard

A static operator dashboard is served from the API origin at /dashboard/. It reads the same REST API as any other client — there is no privileged back channel.

FeedPulse dashboard overview: feed counts, ingestion volume and recent activity

FeedPulse dashboard alerts view: generated alerts with their matched rules and delivery state


Configuration

Every variable is parsed and validated at startup by src/shared/config/env.schema.ts. A malformed value fails the boot rather than silently degrading. A key the schema does not declare is stripped, not rejected — so a misspelled variable name is silently inert rather than fatal. .env.example is the annotated template; the table below covers what most deployments need.

Required

Variable Notes
DATABASE_URL PostgreSQL connection string. There is no POSTGRES_HOST — this is the only knob.
REDIS_URL Redis connection string.

Core runtime

Variable Default Notes
NODE_ENV development development | test | production.
PORT 3000 API HTTP port.
LOG_LEVEL info fataltrace.
SHUTDOWN_TIMEOUT_MS 30000 Force-exit deadline armed on the first SIGINT/SIGTERM.
ENABLE_SWAGGER on outside prod Serves /docs and /docs-json.
CORS_ORIGINS unset Comma-separated allow-list. Empty disables CORS.

Authentication

Variable Default Notes
ENABLE_AUTH false Startup fails if this is false while NODE_ENV=production.
AUTH_PROVIDER clerk_api_key api_key | clerk | clerk_api_key. Anything else fails startup.
BOOTSTRAP_API_KEY unset Seeded into api_keys by npm run migrate, idempotently.
BOOTSTRAP_API_KEY_TENANT_ID legacy
CLERK_SECRET_KEY / CLERK_PUBLISHABLE_KEY unset Only for the Clerk providers.

Scheduling and fetching

Variable Default Notes
SCHEDULER_TICK_MS 15000
SCHEDULER_BATCH_SIZE 100 Feeds claimed per tick. Clamped to 40 — see the note below.
SCHEDULER_STUCK_FEED_THRESHOLD_SECONDS 300 Must stay above RATE_LIMIT_MAX_BACKOFF_MS + FETCH_TIMEOUT_MS.
WORKER_CONCURRENCY 5 Clamped to 3 — see the note below.
FETCH_TIMEOUT_MS 10000
RATE_LIMIT_REQUESTS_PER_SECOND 2 Outbound, per feed domain.
RATE_LIMIT_BASE_BACKOFF_MS 1000 Outbound backoff base.
RATE_LIMIT_MAX_BACKOFF_MS 60000 Outbound backoff ceiling.

The two clamps are real and they sit above the defaults. AppConfigService caps SCHEDULER_BATCH_SIZE at 40 and WORKER_CONCURRENCY at 3 (src/shared/config/app-config.service.ts), so the 100 and 5 in the table are the schema defaults, not the effective values — raising either variable past its cap has no effect and emits no warning. The caps were added deliberately to bound scheduler load. To get more throughput, run more worker replicas rather than raising WORKER_CONCURRENCY.

Inbound limits and safety

Variable Default Notes
RATE_LIMIT_TTL_SECONDS 60 Window for the inbound per-tenant buckets.
RATE_LIMIT_MAX_REQUESTS 300 Every /api/ route. 0 disables.
RATE_LIMIT_WRITE_MAX_REQUESTS 30 Enqueue/outbound endpoints. 0 disables.
MAX_FEEDS_PER_TENANT 500 0 disables the cap.
ALLOW_PRIVATE_FEED_HOSTS false Disables the SSRF host checks. Self-hosted and smoke stacks only.
FEED_FETCH_MAX_BYTES 5242880 Streamed body cap, 5 MiB.
OPML_UPLOAD_MAX_BYTES 10485760 10 MiB, enforced at the stream level.

Notifications and observability

Variable Default Notes
WEBHOOK_NOTIFIER_URL unset Unset selects the no-op notifier.
WEBHOOK_NOTIFIER_TIMEOUT_MS 5000
RESEND_API_KEY / RESEND_FROM_EMAIL unset Email channel.
RESEND_DAILY_LIMIT 100 Per tenant, UTC day. 0 disables the quota.
TELEGRAM_BOT_TOKEN unset Global fallback bot.
TELEGRAM_API_URL https://api.telegram.org
TENANT_SECRETS_MASTER_KEY unset Enables per-tenant bot tokens. Must decode to ≥32 bytes of base64; well-known placeholders are rejected.
WORKER_METRICS_PORT 3001 Scraped by the API's /metrics.
WORKER_METRICS_BIND 0.0.0.0 Use 127.0.0.1 outside a private network.
METRICS_AUTH_TOKEN unset Unset leaves /metrics open.

Authentication

Authentication is real: credentials live in the api_keys table, only sha256(key) is stored, lookup goes through a partial index on revoked_at IS NULL, and the comparison is timingSafeEqual. Unknown, malformed and revoked keys are deliberately indistinguishable to the caller.

Mint a key:

npm run apikey:create -- --tenant my-tenant --label laptop
API key created. Store it now — it cannot be recovered.
  id:        2
  tenant:    acme
  label:     laptop
  prefix:    92cb32ac
  key:       fp_92cb32ac_YFdzGCjd4CFCmfjupSPWMfB18P8Y4xmwZc0Fs2DCn7Q

The plaintext key is printed exactly once. The prefix is stored in clear so a key stays identifiable in the UI and in logs without the secret ever appearing there.

Send it on every /api/ request:

x-api-key: fp_<prefix>_<secret>

Authorization: Bearer <key> also works, and with AUTH_PROVIDER=clerk or clerk_api_key a three-segment Clerk JWT in the same header is verified as a session token instead. The tenant is resolved once per request by a global guard; every repository query filters on it.

GET /api/v1/auth/dashboard-config is the single public /api/ route — the dashboard has to reach it before it owns a credential.

ENABLE_AUTH=false resolves every request to the shared legacy tenant with no credential. It is a local development mode, and the environment schema refuses to boot a NODE_ENV=production process in it.


Rules

A rule is two keyword lists. There is no field, operator or value.

{
  "name": "Grid outages",
  "include_keywords": ["power outage", "São Paulo"],
  "exclude_keywords": ["scheduled maintenance"],
  "is_active": true
}

Matching runs over the entry's title and content combined, and behaves as follows:

  • Accent- and case-insensitive. Both sides are normalized to Unicode NFD, combining diacritics are stripped, text is lowercased and whitespace runs collapse. The keyword São Paulo matches a headline that writes Sao Paulo, and vice versa, and a phrase still matches a headline that wraps across lines.
  • Whole word or whole phrase. Boundaries use Unicode lookarounds, not \b, so the keyword ai does not match said or certain, and outage does not match outages. Keywords like c++ and non-Latin scripts work correctly for the same reason. There is no substring fallback — substring matching is the bug this module exists to remove.
  • Include is OR, exclude is a veto. Any include keyword matching is enough; any exclude keyword matching suppresses the rule. A rule whose include list is empty after trimming never matches, so an empty array cannot become a match-all firehose.
  • Bounded and tenant-scoped. 20 keywords per list, 200 characters each, names unique per tenant.

POST /api/v1/rules/batch creates up to 50 rules in one call. It is create-only: a name the tenant already has is reported back untouched, never overwritten, and the response accounts for every submitted name exactly once as created, skippedNames or duplicateNames.


API

Domain routes live under /api/v1; operational routes sit outside it so orchestrators do not track the API version. Lists use page / page_size (default 1 / 50, max 200) and return a has_next flag. Successes are { data, meta }; failures are one flat envelope with a stable snake_case code.

Group Routes
Feeds POST /feeds · POST /feeds/validate · GET /feeds · GET /feeds/:id · PATCH /feeds/:id · POST /feeds/:id/check-now · DELETE /feeds/:id
Rules POST /rules · POST /rules/batch · GET /rules · GET /rules/:id · PATCH /rules/:id · DELETE /rules/:id
Entries GET /entries — filters: feed_id, search, from, to
Alerts GET /alerts · GET /alerts/:id · POST /alerts/:id/send
Settings GET /settings · PUT /settings
OPML POST /opml/imports · GET /opml/imports/:id/preview · POST /opml/imports/:id/confirm · GET /opml/imports/:id/status
Dashboard GET /auth/dashboard-config (public)
Operations GET /ops/summary · GET /health · GET /ready · GET /metrics

DELETE on a feed or a rule disables it — persisted history keeps referencing it. /entries is feed-filtered by query parameter, not by a nested path.

The full contract, with request and response bodies, filters, error codes and limits: docs/api.md. The machine-readable document is committed at docs/openapi.json and regenerated with npm run docs:openapi, so a pull request that changes a route shows the contract change in its own diff.


Performance

Feed capacity benchmark: total ingestion time across 100, 1,000, 5,000 and 10,000 feeds, growing as O(n^0.55)

Four stages — 100, 1,000, 5,000 and 10,000 feeds — driven through the real API, with per-stage artifacts written under artifacts/benchmark/. Total wall time grows as roughly O(n^0.55), i.e. sublinearly: per-feed cost falls as the batch grows, because the fixed per-tick and per-connection costs amortise.

Per-feed cost across the four stages: 21.66 → 53.53 → 2.24 → 5.75 ms/feed.

Read those numbers honestly:

  • The feeds are served by the local deterministic fixture in scripts/smoke, not by the live internet. This measures the ingestion pipeline — queue, fetch, parse, dedupe, match, persist — with network variance removed on purpose. It is not a claim about how fast 10,000 real sites respond.
  • The chart is a single local run on unspecified hardware. Absolute milliseconds are machine-dependent and are not portable; the exponent and the shape are what the run is evidence for.
  • Reproduce it yourself with npm run benchmark:stages:mvp and compare against your own hardware. See docs/local-benchmark.md.

Deployment

Two supported shapes, and the choice is a real one rather than a preference.

Docker Compose (compose.dokploy.yml) is the simpler and, at low feed counts, the cheaper option. It is what the project ran on first.

Kubernetes (k8s/) exists because of one property Compose cannot express: the worker's load is a function of queue depth, not of HTTP traffic. It blocks on network I/O against slow feeds, so CPU stays low exactly while the backlog grows — a CPU-based autoscaler would never fire. A KEDA ScaledObject reads the BullMQ waiting list in Redis and scales the worker on the signal that actually tracks the work. At the 10,000-feed scale this was built for, that is the difference between a backlog that drains and one that does not.

The manifests are not decorative. .github/workflows/k8s.yml schema-checks them with kubeconform and then applies them to a real cluster on every change: it builds the image, side-loads it into kind, runs the migration Job, waits for all three runtimes, curls /health and /ready, restarts the worker to exercise graceful shutdown, installs KEDA, and waits for the ScaledObject to report Ready=True.

The honest counterpart is tracked in #24: measuring the crossover point against a scale-to-zero PaaS and publishing the range where Kubernetes is the wrong choice.

See k8s/README.md for the decisions and their reasoning.


Engineering notes

Four places where the obvious implementation is wrong, and the repository says why.

The alert upsert distinguishes insert from update with xmax. AlertsRepository.createForEntryWithRules writes a whole batch of alerts in one INSERT … ON CONFLICT … DO UPDATE … RETURNING (xmax = 0) AS inserted. xmax = 0 is true only for tuples that statement actually inserted, which is what separates "new alert, deliver it" from "existing alert that merely gained another matching rule, do not re-deliver". A read-then-write would be racy; a plain DO NOTHING would lose the new rule. → ADR 0003

The canonicalizer has a SQL/TypeScript parity spec, and it cost a design tradeoff. The alert dedupe key is a canonicalized article URL, produced in TypeScript at ingestion and in plpgsql by migration 0018's backfill. If the two disagree by one byte, a backfilled row and a fresh row for the same article stop colliding and the tenant gets exactly the duplicate the migration exists to prevent. The TypeScript side used to normalize the query through URLSearchParams, whose WHATWG form serializer rewrites %20+ and %41A — unreproducible in plpgsql without reimplementing a percent-encode set that includes every code point above U+007E. The query is now read from the original input string and left byte-stable instead. test/canonical-link-parity.integration-spec.ts proves the two agree.

SSRF containment re-validates every redirect hop. Validating a URL once and letting fetch follow redirects is a bypass: a public origin can answer 302 Location: http://169.254.169.254/ and land you on cloud metadata. safeFetch uses redirect: 'manual', resolves each Location against the current hop and re-runs the host check before issuing the next request, with at most 5 hops and a streamed body cap. What it deliberately does not do is DNS-rebinding protection — url-safety.ts explains why a half-implementation would buy only a false sense of safety.

The scheduler claims feeds, and sweeps before it claims. Selection and reservation are one UPDATE … WHERE id IN (SELECT … FOR UPDATE SKIP LOCKED), so two schedulers cannot dispatch the same feed. Because that statement also pushes next_check_at forward, a worker dying mid-fetch would strand the feed for a whole poll interval — so ReleaseStuckFeedsUseCase runs first in every tick and recovery happens within one tick instead. New check times carry min(300s, 20% of the interval) of jitter, because feeds registered together otherwise stay in lockstep forever. → ADR 0002


Testing

npm test                  # everything, serially
npm run test:unit         # pure unit specs, parallel workers
npm run test:integration  # Nest bootstrap / pg-mem / real PostgreSQL
npm run smoke:ci          # full Docker stack, end to end, self-cleaning

The naming convention is the only switch: *.spec.ts is a pure unit test with no I/O; *.integration-spec.ts may use pg-mem, a Nest TestingModule or a real database.

Database-gated suites

Several suites assert against a real PostgreSQL and skip silently when TEST_DATABASE_URL is unset. A green npm test without a database is therefore a weaker signal than it looks: it leaves the migration runner, schema parity, tenant isolation, the feed claim/sweep and the canonical-link dedupe unexercised.

docker run -d --rm --name fp-test --network host \
  -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=feedpulse_test -e PGPORT=55999 \
  postgres:16-alpine

TEST_DATABASE_URL=postgres://postgres:postgres@127.0.0.1:55999/feedpulse_test npm test

docker rm -f fp-test

That schema is wiped on every run, and the role needs CREATE DATABASE — the migration-fidelity suite provisions a throwaway database per run. CI provisions postgres:16-alpine and exports TEST_DATABASE_URL, so these suites do run on every pull request.

docs/testing.md documents the shared harness and, more usefully, the measured pg-mem capability boundary — what the emulator supports, what is shimmed, and which migrations therefore require a real PostgreSQL.


Quality gates

Every gate below runs on each pull request, and each is reproducible locally with the same command CI uses. The first five are the .github/workflows/ci.yml job, in order; the audit is a separate job in codeql.yml, which also runs on every pull request to main.

npm run lint          # ESLint (flat config, type-aware) — must report 0 errors
npm run format:check  # Prettier — no diff allowed
npm run typecheck     # tsc --noEmit, incremental disabled
npm run test:cov      # Jest with coverage thresholds enforced
npm run build         # Emits dist/ — the artifact the image runs
npm audit --audit-level=high --omit=dev   # Blocking supply-chain gate (codeql.yml)

Two gates are easy to get subtly wrong:

  • typecheck passes --incremental false on purpose. With the build info cache warm, tsc --noEmit can report zero errors on a tree that does not actually compile.
  • The overrides block in package.json is what holds npm audit at zero vulnerabilities. Removing it turns the audit gate red.

Coverage thresholds are a ratchet set just under the database-less run, since that is the weakest run anyone can perform. Raise them as coverage rises; never lower them to make a build pass. .github/workflows/smoke.yml reuses this workflow and gates a full Docker stack run behind it; codeql.yml adds static analysis and a dependency-advisory gate; nightly.yml runs the suite on the next Node major and the capacity benchmark.


Roadmap and known limits

Stated plainly, because a portfolio README that lists only strengths is not evidence of judgement.

Not implemented

  • DNS-rebinding protection. url-safety.ts validates the hostname literal. A host that resolves public at validation time and private at connect time is not blocked. Closing it needs a custom undici dispatcher pinned to the validated IP.
  • fetch_logs retention. The table grows without bound and has no pruning job. It needs one before a long-lived deployment.
  • Per-attempt delivery history. Delivery state is three status columns on the alert row, not an alert_deliveries child table. The upgrade path is documented in ADR 0004.
  • Field-level validation detail. The error envelope carries a stable code but no details map, so a validation failure says rule_keyword_too_long, not which keyword. ADR 0005 records why a second envelope was rejected and what the additive fix looks like.
  • Full-text search. GET /entries?search= is an ILIKE '%…%' scan; the GIN index on to_tsvector(normalized_search_document) exists but no query path uses it yet, which is why the search term is capped at 200 characters.
  • Adaptive polling. poll_interval_seconds is whatever you set. The original design called for intervals that tighten on active feeds and widen on quiet ones. Only half the input exists: ingestion writes feeds.avg_response_ms on every fetch, but feeds.avg_items_per_day is declared by migration 0001 and never written, so it is always NULL. Both the backfill and the policy remain to be written.
  • Down migrations. Migrations are append-only and checksummed. Rolling back means writing a new forward migration.

Deliberate constraints

  • One scheduler. The claim is safe under concurrency, but more schedulers add contention, not throughput. Scale the worker.
  • Redis is required. Losing it costs the jobs in flight, which the claim sweep recovers on the next tick — but the ingestion path is down while it is down.
  • The alert dedupe key is a URL, so a publisher that changes an article's URL produces a second alert.

Documentation

Document Contents
docs/architecture.md Runtimes, modules, ports and adapters, ingestion flow, scaling.
docs/api.md The living HTTP contract.
docs/database.md The schema as the migrations actually build it.
docs/testing.md Suite layout, harness, and the pg-mem capability boundary.
docs/adr/ Decision records.
docs/local-smoke.md Deterministic full-stack smoke flow.
docs/local-benchmark.md Feed-capacity benchmark.
docs/deployment-dokploy.md Single-VPS deployment.

Tech stack

Node.js 24 · TypeScript 5 · NestJS 11 · PostgreSQL (raw SQL via pg) · Redis + BullMQ · rss-parser · Zod and class-validator · prom-client · nestjs-pino · Jest, pg-mem and supertest.

Project

Document Contents
CONTRIBUTING.md Local setup, the gates CI runs, commit and migration rules.
CHANGELOG.md What changed, in Keep a Changelog format.
SECURITY.md How to report a vulnerability, and the known gaps.
CODE_OF_CONDUCT.md Contributor Covenant 2.1.

License

MIT. See LICENSE.

About

RSS monitoring platform with hexagonal/DDD architecture — three runtimes (api/scheduler/worker), observability, queues, benchmarks and production-grade tests.

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