molecule-core/platform/entrypoint-tenant.sh
Hongming Wang a363b56f25 feat(tenant): combined platform + canvas Docker image with reverse proxy
Single-container tenant architecture: Go platform (:8080) + Canvas
Node.js (:3000) in one Fly machine, with Go's NoRoute handler reverse-
proxying non-API routes to the canvas. Browser only talks to :8080.

Changes:

platform/Dockerfile.tenant — multi-stage build (Go + Node + runtime).
  Bakes workspace-configs-templates/ + org-templates/ into the image.
  Build context: repo root.

platform/entrypoint-tenant.sh — starts both processes, kills both if
  either exits. Fly health check on :8080 covers the Go binary; canvas
  health is implicit (proxy returns 502 if canvas is down).

platform/internal/router/canvas_proxy.go — httputil.ReverseProxy that
  forwards unmatched routes to CANVAS_PROXY_URL (http://localhost:3000).
  Activated by NoRoute when CANVAS_PROXY_URL env is set.

platform/internal/router/router.go — wire NoRoute → canvasProxy when
  CANVAS_PROXY_URL is present; no-op otherwise (local dev unchanged).

platform/internal/middleware/securityheaders.go — relaxed CSP to allow
  Next.js inline scripts/styles/eval + WebSocket + data: URIs. The
  strict `default-src 'self'` was blocking all canvas rendering.

canvas/src/lib/api.ts — changed `||` to `??` for NEXT_PUBLIC_PLATFORM_URL
  so empty string means "same-origin" (combined image) instead of falling
  back to localhost:8080.

canvas/src/components/tabs/TerminalTab.tsx — same `??` fix for WS URL.

Verified: tenant machine boots, canvas renders, 8 runtime templates +
4 org templates visible, API routes work through the same port.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-16 02:46:47 -07:00

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#!/bin/sh
# Tenant entrypoint — starts both Go platform (API) and Canvas (UI).
#
# Go platform listens on :8080 (Fly health checks hit this port).
# Canvas Node.js listens on :3000 (internal only).
# The Go platform's fallback handler proxies non-API routes to :3000
# so the browser only ever talks to :8080.
#
# If either process dies, we kill the other and exit non-zero so Fly
# restarts the machine.
set -e
# Start Canvas in background
cd /canvas
PORT=3000 HOSTNAME=0.0.0.0 node server.js &
CANVAS_PID=$!
# Start Go platform in foreground-ish (we trap signals)
cd /
/platform &
PLATFORM_PID=$!
# If either process exits, kill the other
cleanup() {
kill $CANVAS_PID 2>/dev/null || true
kill $PLATFORM_PID 2>/dev/null || true
}
trap cleanup EXIT SIGTERM SIGINT
# Wait for either to exit — whichever exits first triggers cleanup
wait -n $CANVAS_PID $PLATFORM_PID
EXIT_CODE=$?
cleanup
exit $EXIT_CODE