firebird/examples/phoenix_wasm_app.exs at master · hdresearch/firebird · GitHub

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# Phoenix WASM App Example
#
# Demonstrates building a complete REST API using Firebird's
# WASM-accelerated Phoenix components.
#
# Run with: mix run examples/phoenix_wasm_app.exs

IO.puts("""

🔥 Firebird Phoenix WASM - REST API Example
#{String.duplicate("═", 50)}

Building a User API with:
  • WASM routing (compiled route table)
  • WASM template rendering
  • WASM form validation
  • Elixir middleware (auth, logging, timing)
  • Error handling
""")

# ── Step 1: Start all WASM components ──

IO.puts("📦 Loading 11 WASM components...")
{:ok, components} = Firebird.Phoenix.start()
IO.puts("   ✅ All components loaded\n")

# ── Step 2: Build the request handler ──

alias Firebird.Phoenix.{RequestHandler, Middleware, Conn}

{:ok, handler} = RequestHandler.new()

# Add middleware
handler =
  handler
  |> RequestHandler.use_middleware(Middleware.request_id())
  |> RequestHandler.use_middleware(Middleware.timer())
  |> RequestHandler.use_middleware(Middleware.logger())
  |> RequestHandler.use_middleware(Middleware.default_header("x-powered-by", "Firebird WASM"))

# Define routes
handler =
  handler
  |> RequestHandler.route("GET", "/", "PageController.index")
  |> RequestHandler.route("GET", "/api/users", "UserController.index")
  |> RequestHandler.route("GET", "/api/users/:id", "UserController.show")
  |> RequestHandler.route("POST", "/api/users", "UserController.create")
  |> RequestHandler.route("PUT", "/api/users/:id", "UserController.update")
  |> RequestHandler.route("DELETE", "/api/users/:id", "UserController.delete")
  |> RequestHandler.route("GET", "/api/health", "HealthController.check")

# Define templates
handler =
  handler
  |> RequestHandler.template(
    "PageController.index",
    200,
    "text/html",
    "<html><body><h1>Welcome to Firebird Phoenix WASM</h1><p>A REST API powered by WebAssembly</p></body></html>"
  )
  |> RequestHandler.template(
    "UserController.index",
    200,
    "application/json",
    ~s([{"id":"1","name":"Alice"},{"id":"2","name":"Bob"},{"id":"3","name":"Charlie"}])
  )
  |> RequestHandler.template(
    "UserController.show",
    200,
    "application/json",
    ~s({"id":"{{id}}","name":"User {{id}}","email":"user{{id}}@example.com"})
  )
  |> RequestHandler.template(
    "UserController.create",
    201,
    "application/json",
    ~s({"status":"created","message":"User created successfully"})
  )
  |> RequestHandler.template(
    "UserController.update",
    200,
    "application/json",
    ~s({"status":"updated","id":"{{id}}"})
  )
  |> RequestHandler.template(
    "UserController.delete",
    200,
    "application/json",
    ~s({"status":"deleted","id":"{{id}}"})
  )
  |> RequestHandler.template(
    "HealthController.check",
    200,
    "application/json",
    ~s({"status":"ok","uptime":"100%","wasm":"active"})
  )

IO.puts("🛣️  Routes defined:")
IO.puts("   GET    /")
IO.puts("   GET    /api/users")
IO.puts("   GET    /api/users/:id")
IO.puts("   POST   /api/users")
IO.puts("   PUT    /api/users/:id")
IO.puts("   DELETE /api/users/:id")
IO.puts("   GET    /api/health")
IO.puts("")

# ── Step 3: Process requests ──

IO.puts("📨 Processing requests...\n")

requests = [
  {"GET", "/", "Homepage"},
  {"GET", "/api/health", "Health check"},
  {"GET", "/api/users", "List users"},
  {"GET", "/api/users/42", "Get user 42"},
  {"POST", "/api/users", "Create user"},
  {"PUT", "/api/users/7", "Update user 7"},
  {"DELETE", "/api/users/3", "Delete user 3"},
  {"GET", "/api/nonexistent", "404 test"}
]

for {method, path, description} <- requests do
  {time_us, {:ok, conn}} =
    :timer.tc(fn ->
      RequestHandler.handle(handler, method, path)
    end)

  status_emoji =
    cond do
      conn.status in 200..299 -> "✅"
      conn.status == 404 -> "🔍"
      true -> "❌"
    end

  body_preview =
    if conn.resp_body do
      String.slice(conn.resp_body, 0..60)
      |> String.replace("\n", " ")
    else
      "(empty)"
    end

  IO.puts("#{status_emoji} #{method} #{path}")
  IO.puts("   #{description}")
  IO.puts("   Status: #{conn.status} | #{time_us}µs")
  IO.puts("   Body: #{body_preview}")
  IO.puts("")
end

# ── Step 4: Validator demo ──

IO.puts("#{String.duplicate("─", 50)}")
IO.puts("🔒 WASM Validator Demo\n")

{:ok, validator} = Firebird.Phoenix.Validator.start()

# Valid form
IO.puts("  Valid user registration:")

{:ok, result} =
  Firebird.Phoenix.Validator.validate(
    validator,
    %{
      "name" => "Alice Smith",
      "email" => "alice@example.com",
      "age" => "25",
      "password" => "securepass123"
    },
    [
      {:required, "name"},
      {:required, "email"},
      {:required, "password"},
      {:type, "email", :email},
      {:type, "age", :integer},
      {:min_length, "password", 8}
    ]
  )

IO.puts("    Result: #{inspect(result)}")

# Invalid form
IO.puts("\n  Invalid user registration:")

{:ok, result} =
  Firebird.Phoenix.Validator.validate(
    validator,
    %{
      "name" => "A",
      "email" => "not-email",
      "age" => "abc"
    },
    [
      {:required, "name"},
      {:required, "email"},
      {:required, "password"},
      {:type, "email", :email},
      {:type, "age", :integer},
      {:min_length, "name", 2}
    ]
  )

IO.puts("    Result: #{inspect(result)}")

Firebird.Phoenix.Validator.stop(validator)

# ── Step 5: Benchmark ──

IO.puts("\n#{String.duplicate("─", 50)}")
IO.puts("⚡ Performance Benchmark\n")

iterations = 1000

{total_us, _} =
  :timer.tc(fn ->
    for _ <- 1..iterations do
      RequestHandler.handle(handler, "GET", "/api/users/42")
    end
  end)

avg = total_us / iterations
ops_per_sec = iterations / (total_us / 1_000_000)

IO.puts("  #{iterations} requests processed")
IO.puts("  Average: #{Float.round(avg / 1.0, 1)}µs per request")
IO.puts("  Throughput: #{Float.round(ops_per_sec, 0)} req/sec")

# Cleanup
Firebird.Phoenix.stop(components)

IO.puts("""

#{String.duplicate("═", 50)}
🏁 Demo complete!

This example demonstrated:
  ✅ 11 WASM modules loaded and working
  ✅ Route matching via compiled WASM
  ✅ Template rendering with variable substitution
  ✅ Middleware pipeline (request_id, timer, logger)
  ✅ Form validation via WASM
  ✅ Error handling (404 responses)
  ✅ Sub-millisecond request processing
""")