Class: AllStak::Integrations::Rack::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/allstak/integrations/rack.rb

Overview

Rack middleware that:

  1. Starts a fresh trace per request (or adopts X-AllStak-Trace-Id / traceparent)

  2. Captures inbound HTTP request telemetry

  3. Auto-captures unhandled exceptions with full request context, user, stack, and trace link

  4. Re-raises so the framework’s exception handler runs

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/allstak/integrations/rack.rb', line 10

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/allstak/integrations/rack.rb', line 14

def call(env)
  return @app.call(env) unless AllStak.initialized?

  client = AllStak.client
  config = client.config

  start = now_ms
  started_at = Time.now.utc.iso8601(3)

  # Trace id — adopt incoming or mint fresh per request
  incoming = env["HTTP_X_ALLSTAK_TRACE_ID"] || env["HTTP_TRACEPARENT"]
  if incoming && !incoming.empty?
    client.tracing.set_trace_id(incoming)
  else
    client.tracing.reset_trace
  end
  trace_id = client.tracing.current_trace_id

  status = 0
  headers = {}
  body = nil
  captured = nil

  begin
    status, headers, body = @app.call(env)
  rescue => e
    captured = e
    status = 500 if status.to_i == 0
    raise
  ensure
    duration = now_ms - start

    # Request telemetry
    if config.capture_http_requests
      begin
        req_size = env["CONTENT_LENGTH"].to_i
        resp_size = headers && headers["Content-Length"].to_i
        user_id = extract_user_id(env)
        path = env["PATH_INFO"] || "/"

        client.http.record(
          direction: "inbound",
          method: env["REQUEST_METHOD"] || "GET",
          host: env["HTTP_HOST"] || "localhost",
          path: path,
          status_code: status.to_i,
          duration_ms: duration,
          request_size: req_size,
          response_size: resp_size || 0,
          trace_id: trace_id,
          user_id: user_id
        )
      rescue => err
        # never raise into host
        config.debug && warn("[AllStak] rack request capture failed: #{err.message}")
      end
    end

    # Exception capture
    if captured && config.capture_unhandled_exceptions
      begin
        user_ctx = config.capture_user_context ? build_user_context(env) : nil
        req_ctx = AllStak::Models::RequestContext.new(
          method: env["REQUEST_METHOD"],
          path: env["PATH_INFO"],
          host: env["HTTP_HOST"],
          status_code: status.to_i == 0 ? 500 : status.to_i,
          user_agent: env["HTTP_USER_AGENT"]
        )
        meta = {
          "http.method" => env["REQUEST_METHOD"],
          "http.path"   => env["PATH_INFO"],
          "http.host"   => env["HTTP_HOST"],
          "http.status" => status.to_i == 0 ? 500 : status.to_i,
          "traceId"     => trace_id
        }
        client.errors.capture_exception(
          captured,
          user: user_ctx,
          request_context: req_ctx,
          trace_id: trace_id,
          metadata: meta
        )
      rescue => err
        config.debug && warn("[AllStak] rack exception capture failed: #{err.message}")
      end
    end

    # Best-effort response header for downstream trace linkage
    headers["X-AllStak-Trace-Id"] = trace_id if headers && !captured
  end

  [status, headers, body]
end