Module: Datadog::AppSec::Contrib::Rack::Gateway::Watcher

Defined in:
lib/datadog/appsec/contrib/rack/gateway/watcher.rb

Overview

Watcher for Rack gateway events

Class Method Summary collapse

Class Method Details

.watch ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rack/gateway/watcher.rb', line 16

def watch
  gateway = Instrumentation.gateway

  watch_request(gateway)
  watch_response(gateway)
  watch_request_body(gateway)
end

.watch_request(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rack/gateway/watcher.rb', line 24

def watch_request(gateway = Instrumentation.gateway)
  gateway.watch('rack.request', :appsec) do |stack, gateway_request|
    block = false
    event = nil
    scope = gateway_request.env[Datadog::AppSec::Ext::SCOPE_KEY]

    AppSec::Reactive::Operation.new('rack.request') do |op|
      Rack::Reactive::Request.subscribe(op, scope.processor_context) do |result|
        if result.status == :match
          # TODO: should this hash be an Event instance instead?
          event = {
            waf_result: result,
            trace: scope.trace,
            span: scope.service_entry_span,
            request: gateway_request,
            actions: result.actions
          }

          if scope.service_entry_span
            scope.service_entry_span.set_tag('appsec.blocked', 'true') if result.actions.include?('block')
            scope.service_entry_span.set_tag('appsec.event', 'true')
          end

          scope.processor_context.events << event
        end
      end

      block = Rack::Reactive::Request.publish(op, gateway_request)
    end

    next [nil, [[:block, event]]] if block

    ret, res = stack.call(gateway_request.request)

    if event
      res ||= []
      res << [:monitor, event]
    end

    [ret, res]
  end
end

.watch_request_body(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rack/gateway/watcher.rb', line 111

def watch_request_body(gateway = Instrumentation.gateway)
  gateway.watch('rack.request.body', :appsec) do |stack, gateway_request|
    block = false

    event = nil
    scope = gateway_request.env[Datadog::AppSec::Ext::SCOPE_KEY]

    AppSec::Reactive::Operation.new('rack.request.body') do |op|
      Rack::Reactive::RequestBody.subscribe(op, scope.processor_context) do |result|
        if result.status == :match
          # TODO: should this hash be an Event instance instead?
          event = {
            waf_result: result,
            trace: scope.trace,
            span: scope.service_entry_span,
            request: gateway_request,
            actions: result.actions
          }

          if scope.service_entry_span
            scope.service_entry_span.set_tag('appsec.blocked', 'true') if result.actions.include?('block')
            scope.service_entry_span.set_tag('appsec.event', 'true')
          end

          scope.processor_context.events << event
        end
      end

      block = Rack::Reactive::RequestBody.publish(op, gateway_request)
    end

    next [nil, [[:block, event]]] if block

    ret, res = stack.call(gateway_request.request)

    if event
      res ||= []
      res << [:monitor, event]
    end

    [ret, res]
  end
end

.watch_response(gateway = Instrumentation.gateway) ⇒ Object 



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# File 'lib/datadog/appsec/contrib/rack/gateway/watcher.rb', line 67

def watch_response(gateway = Instrumentation.gateway)
  gateway.watch('rack.response', :appsec) do |stack, gateway_response|
    block = false

    event = nil
    scope = gateway_response.scope

    AppSec::Reactive::Operation.new('rack.response') do |op|
      Rack::Reactive::Response.subscribe(op, scope.processor_context) do |result|
        if result.status == :match
          # TODO: should this hash be an Event instance instead?
          event = {
            waf_result: result,
            trace: scope.trace,
            span: scope.service_entry_span,
            response: gateway_response,
            actions: result.actions
          }

          if scope.service_entry_span
            scope.service_entry_span.set_tag('appsec.blocked', 'true') if result.actions.include?('block')
            scope.service_entry_span.set_tag('appsec.event', 'true')
          end

          scope.processor_context.events << event
        end
      end

      block = Rack::Reactive::Response.publish(op, gateway_response)
    end

    next [nil, [[:block, event]]] if block

    ret, res = stack.call(gateway_response.response)

    if event
      res ||= []
      res << [:monitor, event]
    end

    [ret, res]
  end
end