Merge pull request #939 from Molecule-AI/docs/tunnel-migration-report
docs: Cloudflare Tunnel migration report + Worker source
This commit is contained in:
Hongming Wang
GitHub
commit
18f3a03aef
223
docs/retrospectives/2026-04-18-tunnel-migration.md
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docs/retrospectives/2026-04-18-tunnel-migration.md
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# Cloudflare Tunnel Migration — Session Report (2026-04-18)
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> **Duration:** ~4 hours
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> **Scope:** Replace Cloudflare Worker + wildcard DNS with per-tenant Cloudflare Tunnels
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> **Issue:** #933
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> **Status:** Tunnel E2E verified on both production and staging subdomains. Ready for production tenant migration.
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---
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## What Was Done
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### 1. PR Triage (15 PRs merged)
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Before tunnel work, cleared the PR backlog since CI runner was slow:
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| PR | Type | Description |
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|----|------|-------------|
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| #934 | docs | Staging environment design + Phase 36 plan |
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| #849 | docs | Partner API Keys (Phase 34) — resolved PLAN.md conflict |
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| #922 | docs | ANTHROPIC_API_KEY as required global secret |
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| #880 | docs | SAFE-MCP internal advisory |
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| #927 | docs | Ecosystem watch daily sweep |
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| #923 | security | Slack OAuth state param — random nonce replaces workspace_id |
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| #913 | security | Redact secrets from commit_memory before persistence |
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| #925 | security | HITL audit log on approval grant/denial |
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| #879 | fix | Canvas TypeScript fixture drift |
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| #915 | feature | A2A topology overlay + hermes plugin declarations |
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| #921 | feature | Audit trail visualization panel |
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| #929 | feature | Temporal crash-resume checkpoints |
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| #937 | fix | go vet errors + supply chain hardening (created + merged) |
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| #938 | fix | Canvas a11y — TeamMemberChip keyboard nav (created + merged) |
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Also closed issue #920 (Slack OAuth) and commented on #889 (VULN-004 dead letter).
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### 2. Cloudflare API Token — Tunnel Permission
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**Problem:** The existing CF API token (`cfut_loLR...`) had DNS:Edit but NOT Cloudflare Tunnel:Edit permission. Tunnel create/list/delete calls returned `code 10000: Authentication error`.
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**Fix:** CEO added Account → Cloudflare Tunnel → Edit permission in Cloudflare Dashboard → API Tokens.
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### 3. Tunnel API Integration Tests
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Ran three progressively comprehensive tests:
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| Test | Result | What it proved |
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|------|--------|----------------|
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| API roundtrip | ✓ | Create tunnel → create DNS CNAME → delete both |
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| DNS resolution | ✓ | CNAME resolves on first attempt (instant, zero propagation delay) |
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| Full E2E with EC2 | ✓ | Tunnel + DNS + EC2 with cloudflared → HTTP 200 through subdomain |
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### 4. Worker Coexistence Fix
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**Problem:** The Cloudflare Worker route `*.moleculesai.app/*` intercepted tunnel CNAME requests before they could reach the tunnel origin. Tunnel subdomains got the Worker's "Organization not found" page instead of routing through the tunnel.
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**Fix (two changes to Worker):**
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```typescript
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// 1. Reserved slugs now pass through instead of returning 404
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if (!slug || slug === host || RESERVED.has(slug) || slug.includes(".")) {
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return fetch(request); // was: return new Response("Not found", { status: 404 });
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}
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// 2. Multi-level subdomains (*.staging.moleculesai.app) bypass Worker entirely
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// slug.includes(".") catches "foo.staging" and passes to tunnel CNAME
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```
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Worker redeployed. Production tenants unaffected — they still route through the Worker. Tunnel-routed subdomains pass through to origin.
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### 5. SSL Certificate for Staging Subdomains
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**Problem:** Cloudflare's free Universal SSL only covers `*.moleculesai.app` (one wildcard level). `*.staging.moleculesai.app` (two levels) fails TLS handshake — no certificate.
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**Fix:** Ordered Advanced Certificate via Cloudflare Dashboard:
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- Hostnames: `*.staging.moleculesai.app`, `staging.moleculesai.app`
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- CA: Let's Encrypt
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- Validity: 90 days, auto-renewal 30 days before expiry
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- Cost: included in Cloudflare free plan (1 of 100 advanced certs)
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### 6. Staging Tunnel E2E — Full Pass
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Final test on `*.staging.moleculesai.app` (fully isolated from production):
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```
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1. Create Tunnel → OK (ea5aaa13...)
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2. Configure ingress → OK (→ localhost:8080)
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3. Create DNS CNAME → OK (tunnel-stg-test.staging.moleculesai.app)
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4. Launch EC2 t3.micro → OK (cloudflared binary download)
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5. Tunnel connected → OK (healthy in 30s)
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6. HTTP 200 through tunnel → OK
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Response: {"status":"ok","domain":"tunnel-stg-test.staging.moleculesai.app"}
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7. Cleanup → OK (EC2 terminated, DNS + tunnel deleted)
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```
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### 7. Platform Build Verification
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After merging 15 PRs, verified everything still builds and passes:
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- Go: `go test -race ./...` — 15/15 packages pass, 0 failures
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- Go: `go vet ./...` — clean
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- Canvas: `npm run build` — success
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- Canvas: `vitest run` — 762/762 tests pass
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---
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## Architecture: Before vs After
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### Before (Cloudflare Worker)
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```
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User → *.moleculesai.app (wildcard A record, proxied)
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→ Cloudflare Worker (extracts slug, looks up EC2 IP from CP API)
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→ Worker proxies to EC2 public IP:8080
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→ EC2 must have public IP + open port 8080
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```
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**Problems:**
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- Edge cache poisoning when wildcard A record IP changes (2+ hour recovery)
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- ADMIN_TOKEN transmitted in plaintext via Worker header injection
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- EC2 requires public IP + open inbound ports (security surface)
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- Worker is a single point of failure for all tenant routing
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- KV cache stale-while-revalidate adds latency on cold starts
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### After (Cloudflare Tunnel)
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```
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User → slug.moleculesai.app (CNAME → tunnel-id.cfargotunnel.com, proxied)
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→ Cloudflare edge routes to tunnel
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→ cloudflared on EC2 (outbound-only connection) receives request
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→ cloudflared forwards to localhost:8080
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→ EC2 needs NO public IP, NO open inbound ports
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```
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**Advantages:**
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- No edge cache — CNAME resolves instantly via Cloudflare's anycast
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- No plaintext secrets in transit — tunnel is encrypted end-to-end
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- EC2 can be in private subnet (no public IP, no security group rules)
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- Each tenant has its own tunnel (no single point of failure)
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- No Worker maintenance, no KV cache management
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- Faster provisioning — DNS works immediately, no cache warming
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---
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## Known Issues & Risks
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### 1. Worker Must Stay Until All Tenants Migrate
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The Worker route `*.moleculesai.app/*` still serves existing tenants (e.g., `hongmingwang.moleculesai.app`). Cannot delete until every tenant has a tunnel + CNAME. The Worker passthrough for reserved/multi-level slugs is the bridge.
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### 2. Worker Source Not in Version Control
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The Worker code lives in `/tmp/molecule-tenant-proxy/` — not tracked in any repo. Needs to be committed somewhere before the session ends. Two changes were deployed:
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- `fetch(request)` passthrough for reserved slugs (was `404`)
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- `slug.includes(".")` bypass for multi-level subdomains
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### 3. cloudflared Binary Download at Boot
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Current EC2 user-data downloads `cloudflared` from GitHub releases at boot time. This adds ~5 seconds and depends on GitHub availability. Pre-baked AMI would eliminate this dependency.
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### 4. Tunnel Token in User-Data
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The `cloudflared` tunnel token is passed in EC2 user-data (base64 encoded). AWS user-data is accessible to anyone with EC2 instance metadata access. The token grants tunnel connection rights — if leaked, an attacker could impersonate the tenant's tunnel. Mitigation: use AWS Secrets Manager or SSM Parameter Store instead.
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### 5. Tunnel Cleanup on Org Delete
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The `DeprovisionInstance` function has a TODO for tunnel deletion. When an org is deleted, the tunnel and DNS CNAME must be cleaned up. The tunnel ID is stored in EC2 tags (`TunnelID`), but needs to be persisted in `org_instances` table for reliable cleanup.
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### 6. No Health Check on Tunnel
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If `cloudflared` crashes on the EC2 but the instance stays running, the tunnel goes inactive but the DNS CNAME still points to it. Need a health sweep that checks tunnel status via CF API and restarts `cloudflared` or the instance.
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### 7. Staging CP Uses Production Tenant Image
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`TENANT_IMAGE` on staging is still `ghcr.io/molecule-ai/platform-tenant:latest` (production). Should be `:staging` once the staging image pipeline is set up.
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---
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## Follow-Up Tasks
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### Immediate (before next deploy)
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- [ ] **Commit Worker code to repo** — decide location (monorepo `infra/` or separate repo), commit current state with the two passthrough changes
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- [ ] **Persist tunnel ID in org_instances table** — add `tunnel_id` column so deprovision cascade can clean up tunnels reliably
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- [ ] **Wire tunnel cleanup into DeprovisionInstance** — delete tunnel + DNS CNAME when org is deleted
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### Short-term (this week)
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- [ ] **Migrate `hongmingwang` tenant to tunnel** — create tunnel, add CNAME, update EC2 to run cloudflared, add slug to Worker RESERVED, verify, then remove old A record
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- [ ] **Staging image pipeline** — publish `:staging` tag on main merge, `:latest` only on manual promote
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- [ ] **Move tunnel token to SSM Parameter Store** — EC2 user-data is not secret-safe; retrieve token at boot via instance role
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### Medium-term (this month)
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- [ ] **Pre-baked AMI with cloudflared** — eliminate GitHub download dependency at boot
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- [ ] **Tunnel health sweep** — periodic check of tunnel status via CF API, restart cloudflared if inactive
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- [ ] **Delete Worker** — once all tenants are on tunnels, remove Worker + wildcard A record entirely
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- [ ] **Private subnet for tenant EC2s** — with tunnels, EC2s don't need public IPs; move to private subnet with NAT gateway for outbound
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### Nice-to-have
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- [ ] **Cloudflare Access** — add zero-trust access policies on tunnel routes (IP allow-list, mTLS)
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- [ ] **Tunnel metrics** — export tunnel connection count, latency, bandwidth to Prometheus/Grafana
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- [ ] **Multi-region tunnels** — cloudflared connects to nearest Cloudflare edge; for multi-region deployments, each region's EC2 gets its own tunnel
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---
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## Cost Impact
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| Item | Before | After |
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|------|--------|-------|
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| Cloudflare Worker | Free (100k req/day) | Eliminated |
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| Workers KV | Free tier | Eliminated |
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| Advanced SSL Cert | $0 | $0 (1 of 100 free) |
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| EC2 public IPs | ~$3.65/mo per tenant | $0 (no public IP needed) |
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| Cloudflare Tunnel | N/A | Free (unlimited tunnels) |
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| **Net change** | | **Saves ~$3.65/tenant/mo** |
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---
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## Key Learnings
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1. **Worker routes take priority over DNS CNAMEs** — even with a CNAME pointing to `cfargotunnel.com`, the Worker's wildcard route fires first. Must explicitly pass through via `fetch(request)`.
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2. **Free Universal SSL only covers one wildcard level** — `*.moleculesai.app` works, `*.staging.moleculesai.app` doesn't. Advanced Certificate (free, Let's Encrypt) solves this.
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3. **Let's Encrypt rejects mixed wildcard+parent certs** — can't put `*.moleculesai.app` and `*.staging.moleculesai.app` in the same cert. Issue separate certs for each level.
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4. **Tunnel connects in ~30 seconds** — from EC2 boot to tunnel healthy, including cloudflared binary download (~5s) + connection establishment (~25s). Faster than DNS propagation ever was.
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5. **DNS CNAME resolves instantly** — no propagation delay, no edge cache, no NXDOMAIN caching. This is the fundamental advantage over the wildcard A record approach.
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6. **cloudflared binary download is faster than apt** — `curl` from GitHub releases (~5s) vs `apt-get install cloudflared` (~30s). Use binary download in boot scripts.
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11
infra/cloudflare-worker/package.json
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11
infra/cloudflare-worker/package.json
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{
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"name": "molecule-tenant-proxy",
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"private": true,
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"scripts": {
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"dev": "wrangler dev",
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"deploy": "wrangler deploy"
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},
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"devDependencies": {
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"wrangler": "^4.0.0"
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}
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}
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280
infra/cloudflare-worker/src/index.ts
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280
infra/cloudflare-worker/src/index.ts
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/**
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* Molecule AI tenant proxy — Cloudflare Worker
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*
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* Routes *.moleculesai.app requests to the correct EC2 tenant instance.
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* Replaces per-tenant DNS records with a single wildcard + edge routing.
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*
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* Cache strategy (3-tier):
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* L1: in-memory Map (60s TTL, per-isolate)
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* L2: Workers KV (5 min TTL, stale-while-revalidate)
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* L3: CP API — GET /cp/orgs/:slug/instance
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* Fallback: serve stale KV when CP is unreachable
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*/
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export interface Env {
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TENANT_CACHE: KVNamespace;
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CP_API_URL: string;
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}
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interface TenantInfo {
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slug: string;
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status: string; // "running" | "provisioning" | "failed"
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ip: string | null;
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org_id: string;
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admin_token?: string;
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}
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// L1: in-memory cache (per-isolate, 60s TTL)
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const memCache = new Map<string, { data: TenantInfo; expires: number }>();
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const MEM_TTL_MS = 60_000;
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const KV_TTL_S = 300; // 5 min
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// Subdomains that are NOT tenants — handled by explicit DNS records
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const RESERVED = new Set(["api", "app", "www", "docs", "doc", "status", "staging-api", "tunneltest"]);
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// Routes that go to platform (:8080) vs canvas (:3000)
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const API_PREFIXES = [
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"/health", "/metrics", "/workspaces", "/registry", "/templates",
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"/org", "/settings", "/plugins", "/events", "/bundles", "/channels",
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"/webhooks", "/approvals", "/admin", "/canvas", "/ws",
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];
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export default {
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async fetch(request: Request, env: Env): Promise<Response> {
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const url = new URL(request.url);
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const host = url.hostname;
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// Extract slug from hostname: "acme.moleculesai.app" → "acme"
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const slug = host.replace(".moleculesai.app", "");
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if (!slug || slug === host || RESERVED.has(slug) || slug.includes(".")) {
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// Pass through to origin (tunnel CNAME or explicit DNS record).
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// slug.includes(".") catches multi-level subdomains like
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// "foo.staging.moleculesai.app" which are routed via CF Tunnel.
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return fetch(request);
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}
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// Lookup tenant backend
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const tenant = await resolveTenant(slug, env);
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if (!tenant) {
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return notFoundPage(slug);
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}
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if (tenant.status === "provisioning" || !tenant.ip) {
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return provisioningPage(slug);
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}
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if (tenant.status === "failed") {
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return errorPage(slug);
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}
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// Route ALL traffic to :8080 (Go platform). The platform proxies non-API
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// routes to Canvas internally via CANVAS_PROXY_URL. We don't split traffic
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// between :8080 and :3000 because Canvas may bind to 127.0.0.1 only
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// (not externally reachable) while the platform is always on 0.0.0.0.
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const backendUrl = `http://${tenant.ip}:8080${url.pathname}${url.search}`;
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// WebSocket upgrade
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if (request.headers.get("Upgrade") === "websocket") {
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return fetch(backendUrl, request);
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}
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// Proxy the request
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const headers = new Headers(request.headers);
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headers.set("X-Molecule-Org-Id", tenant.org_id);
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headers.set("Origin", `https://${slug}.moleculesai.app`);
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headers.set("X-Forwarded-For", request.headers.get("CF-Connecting-IP") || "");
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headers.set("X-Forwarded-Proto", "https");
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headers.set("Host", `${slug}.moleculesai.app`);
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// Inject ADMIN_TOKEN for AdminAuth — the tenant platform validates this
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// as a dedicated admin credential (not a workspace token).
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if (tenant.admin_token) {
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headers.set("Authorization", `Bearer ${tenant.admin_token}`);
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}
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const proxyReq = new Request(backendUrl, {
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method: request.method,
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headers,
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body: request.body,
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redirect: "manual",
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});
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try {
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const resp = await fetch(proxyReq);
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||||
// Strip backend hop headers, pass everything else through
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const respHeaders = new Headers(resp.headers);
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respHeaders.delete("transfer-encoding");
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return new Response(resp.body, {
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||||
status: resp.status,
|
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statusText: resp.statusText,
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||||
headers: respHeaders,
|
||||
});
|
||||
} catch {
|
||||
return new Response("Backend unavailable", { status: 502 });
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||||
}
|
||||
},
|
||||
};
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||||
|
||||
// ---------------------------------------------------------------------------
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||||
// 3-tier cache resolution
|
||||
// ---------------------------------------------------------------------------
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||||
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||||
async function resolveTenant(
|
||||
slug: string,
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||||
env: Env,
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||||
): Promise<TenantInfo | null> {
|
||||
// L1: in-memory
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||||
const mem = memCache.get(slug);
|
||||
if (mem && Date.now() < mem.expires) {
|
||||
return mem.data;
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}
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||||
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// L2: KV (stale-while-revalidate)
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let kvData: TenantInfo | null = null;
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try {
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const kvRaw = await env.TENANT_CACHE.get(slug);
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if (kvRaw) {
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||||
kvData = JSON.parse(kvRaw) as TenantInfo;
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||||
// Populate L1 from KV
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||||
memCache.set(slug, { data: kvData, expires: Date.now() + MEM_TTL_MS });
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||||
}
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||||
} catch { /* KV read failure — continue to L3 */ }
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||||
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||||
// L3: CP API
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||||
try {
|
||||
const resp = await fetch(
|
||||
`${env.CP_API_URL}/cp/orgs/${encodeURIComponent(slug)}/instance`,
|
||||
{ headers: { "User-Agent": "molecule-tenant-proxy/1.0" } },
|
||||
);
|
||||
|
||||
if (resp.status === 404) {
|
||||
// Org doesn't exist — cache the miss briefly to avoid hammering CP
|
||||
memCache.set(slug, {
|
||||
data: { slug, status: "not_found", ip: null, org_id: "" },
|
||||
expires: Date.now() + 10_000, // 10s negative cache
|
||||
});
|
||||
return null;
|
||||
}
|
||||
|
||||
if (resp.ok) {
|
||||
const data = (await resp.json()) as TenantInfo;
|
||||
// Update both caches
|
||||
memCache.set(slug, { data, expires: Date.now() + MEM_TTL_MS });
|
||||
await env.TENANT_CACHE.put(slug, JSON.stringify(data), {
|
||||
expirationTtl: KV_TTL_S,
|
||||
}).catch(() => {}); // KV write failure is non-fatal
|
||||
return data;
|
||||
}
|
||||
} catch {
|
||||
// CP unreachable — fall back to stale KV
|
||||
}
|
||||
|
||||
// Fallback: stale KV data (any age) is better than an error
|
||||
return kvData;
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Static response pages
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
function provisioningPage(slug: string): Response {
|
||||
return new Response(
|
||||
`<!DOCTYPE html>
|
||||
<html lang="en">
|
||||
<head>
|
||||
<meta charset="utf-8">
|
||||
<meta name="viewport" content="width=device-width,initial-scale=1">
|
||||
<meta http-equiv="refresh" content="5">
|
||||
<title>${slug} - Setting up | Molecule AI</title>
|
||||
<style>
|
||||
*{margin:0;padding:0;box-sizing:border-box}
|
||||
body{background:#09090b;color:#f4f4f5;font-family:-apple-system,BlinkMacSystemFont,sans-serif;
|
||||
display:flex;align-items:center;justify-content:center;min-height:100vh}
|
||||
.card{text-align:center;max-width:420px;padding:3rem 2rem}
|
||||
.spinner{width:48px;height:48px;border:3px solid #27272a;border-top-color:#3b82f6;
|
||||
border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 1.5rem}
|
||||
@keyframes spin{to{transform:rotate(360deg)}}
|
||||
h1{font-size:1.25rem;font-weight:600;margin-bottom:.5rem}
|
||||
p{font-size:.875rem;color:#a1a1aa;line-height:1.6}
|
||||
.hint{margin-top:1.5rem;font-size:.75rem;color:#52525b}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<div class="card">
|
||||
<div class="spinner"></div>
|
||||
<h1>Setting up your workspace</h1>
|
||||
<p>Your cloud instance is starting up. This usually takes 2-3 minutes.</p>
|
||||
<p class="hint">This page refreshes automatically.</p>
|
||||
</div>
|
||||
</body>
|
||||
</html>`,
|
||||
{
|
||||
status: 202,
|
||||
headers: {
|
||||
"Content-Type": "text/html;charset=utf-8",
|
||||
"Cache-Control": "no-cache",
|
||||
"Retry-After": "5",
|
||||
},
|
||||
},
|
||||
);
|
||||
}
|
||||
|
||||
function notFoundPage(slug: string): Response {
|
||||
return new Response(
|
||||
`<!DOCTYPE html>
|
||||
<html lang="en">
|
||||
<head>
|
||||
<meta charset="utf-8">
|
||||
<meta name="viewport" content="width=device-width,initial-scale=1">
|
||||
<title>Not Found | Molecule AI</title>
|
||||
<style>
|
||||
*{margin:0;padding:0;box-sizing:border-box}
|
||||
body{background:#09090b;color:#f4f4f5;font-family:-apple-system,BlinkMacSystemFont,sans-serif;
|
||||
display:flex;align-items:center;justify-content:center;min-height:100vh}
|
||||
.card{text-align:center;max-width:420px;padding:3rem 2rem}
|
||||
h1{font-size:1.25rem;font-weight:600;margin-bottom:.5rem}
|
||||
p{font-size:.875rem;color:#a1a1aa;line-height:1.6}
|
||||
a{color:#3b82f6;text-decoration:none}a:hover{text-decoration:underline}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<div class="card">
|
||||
<h1>Organization not found</h1>
|
||||
<p><strong>${slug}.moleculesai.app</strong> doesn't exist.</p>
|
||||
<p style="margin-top:1rem"><a href="https://app.moleculesai.app">Go to Molecule AI</a></p>
|
||||
</div>
|
||||
</body>
|
||||
</html>`,
|
||||
{ status: 404, headers: { "Content-Type": "text/html;charset=utf-8" } },
|
||||
);
|
||||
}
|
||||
|
||||
function errorPage(slug: string): Response {
|
||||
return new Response(
|
||||
`<!DOCTYPE html>
|
||||
<html lang="en">
|
||||
<head>
|
||||
<meta charset="utf-8">
|
||||
<meta name="viewport" content="width=device-width,initial-scale=1">
|
||||
<title>Error | Molecule AI</title>
|
||||
<style>
|
||||
*{margin:0;padding:0;box-sizing:border-box}
|
||||
body{background:#09090b;color:#f4f4f5;font-family:-apple-system,BlinkMacSystemFont,sans-serif;
|
||||
display:flex;align-items:center;justify-content:center;min-height:100vh}
|
||||
.card{text-align:center;max-width:420px;padding:3rem 2rem}
|
||||
h1{font-size:1.25rem;font-weight:600;margin-bottom:.5rem;color:#ef4444}
|
||||
p{font-size:.875rem;color:#a1a1aa;line-height:1.6}
|
||||
a{color:#3b82f6;text-decoration:none}a:hover{text-decoration:underline}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<div class="card">
|
||||
<h1>Provisioning failed</h1>
|
||||
<p>Something went wrong setting up <strong>${slug}</strong>.</p>
|
||||
<p style="margin-top:1rem"><a href="https://app.moleculesai.app">Return to dashboard</a></p>
|
||||
</div>
|
||||
</body>
|
||||
</html>`,
|
||||
{ status: 503, headers: { "Content-Type": "text/html;charset=utf-8" } },
|
||||
);
|
||||
}
|
||||
19
infra/cloudflare-worker/wrangler.toml
Normal file
19
infra/cloudflare-worker/wrangler.toml
Normal file
@ -0,0 +1,19 @@
|
||||
name = "molecule-tenant-proxy"
|
||||
main = "src/index.ts"
|
||||
compatibility_date = "2024-09-23"
|
||||
|
||||
account_id = "bfa4e604e168a938e565600b27e2828c"
|
||||
|
||||
# KV namespace for caching org→IP mappings (L2 cache, 5 min TTL)
|
||||
[[kv_namespaces]]
|
||||
binding = "TENANT_CACHE"
|
||||
id = "752aaa0783514143a1eda9f44a412d7d"
|
||||
|
||||
# Route: all tenant subdomains (wildcard). Explicit records (api, app, www)
|
||||
# take priority in Cloudflare DNS — the Worker only fires for tenant slugs.
|
||||
[[routes]]
|
||||
pattern = "*.moleculesai.app/*"
|
||||
zone_id = "a034108eda16d131ef7f766b923ef464"
|
||||
|
||||
[vars]
|
||||
CP_API_URL = "https://api.moleculesai.app"
|
||||
Loading…
Reference in New Issue
Block a user