Class: Rack::MiniProfiler

Inherits:
Object
  • Object
show all
Extended by:
ProfilingMethods
Includes:
Actions, Views
Defined in:
lib/mini_profiler.rb,
lib/mini_profiler/views.rb,
lib/mini_profiler/config.rb,
lib/mini_profiler/actions.rb,
lib/mini_profiler/version.rb,
lib/patches/db/activerecord.rb,
lib/mini_profiler/asset_version.rb,
lib/mini_profiler/client_settings.rb,
lib/mini_profiler/timer_struct/sql.rb,
lib/mini_profiler/profiling_methods.rb,
lib/mini_profiler/timer_struct/base.rb,
lib/mini_profiler/timer_struct/page.rb,
lib/mini_profiler/storage/file_store.rb,
lib/mini_profiler/storage/redis_store.rb,
lib/mini_profiler/timer_struct/client.rb,
lib/mini_profiler/timer_struct/custom.rb,
lib/mini_profiler/storage/memory_store.rb,
lib/mini_profiler/timer_struct/request.rb,
lib/mini_profiler/storage/abstract_store.rb,
lib/mini_profiler/storage/memcache_store.rb

Defined Under Namespace

Modules: Actions, ActiveRecordInstrumentation, ProfilingMethods, TimerStruct, Views Classes: AbstractStore, ClientSettings, Config, Context, FileStore, GCProfiler, MemcacheStore, MemoryStore, NoBrainerProfiler, RedisStore, SnapshotsTransporter

Constant Summary collapse

VERSION = 
"5.0.0"
SOURCE_CODE_URI = 
"https://github.com/MiniProfiler/rack-mini-profiler"
ASSET_VERSION = 
'0ab236f63a9cce6719807f4cd6470f29'

Constants included from Views

Views::BLANK_PAGE

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ProfilingMethods

counter, counter_method, finish_step, profile_method, profile_singleton_method, record_sql, report_reader_duration, start_step, step, uncounter_method, unprofile_method, unprofile_singleton_method

Methods included from Views

#blank_page_html, #flamegraph, #generate_html, #get_csp_nonce, #get_profile_script, #help, #make_link, #public_base_path, #resources_root, #share_template, #url_for_snapshot, #url_for_snapshots_group

Methods included from Actions

#serve_file, #serve_flamegraph, #serve_profile_gc, #serve_profile_memory, #serve_results, #serve_snapshot

Constructor Details

#initialize(app, config = nil) ⇒ MiniProfiler

options: :auto_inject - should script be automatically injected on every html page (not xhr)



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# File 'lib/mini_profiler.rb', line 129

def initialize(app, config = nil)
  MiniProfiler.config.merge!(config)
  @config = MiniProfiler.config
  @app    = app
  @config.base_url_path += "/" unless @config.base_url_path.end_with? "/"
  unless @config.storage_instance
    @config.storage_instance = @config.storage.new(@config.storage_options)
  end
  @storage = @config.storage_instance
end

Class Attribute Details

.subscribe_sql_active_record ⇒ Object

Returns the value of attribute subscribe_sql_active_record.



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# File 'lib/mini_profiler.rb', line 25

def subscribe_sql_active_record
  @subscribe_sql_active_record
end

Class Method Details

.add_snapshot_custom_field(key, value) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 55

def add_snapshot_custom_field(key, value)
  thread_var_key = :mini_profiler_snapshot_custom_fields
  Thread.current[thread_var_key] ||= {}
  Thread.current[thread_var_key][key] = value
end

.advanced_tools_message ⇒ Object 



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# File 'lib/mini_profiler.rb', line 91

def advanced_tools_message
  <<~TEXT
    This feature is disabled by default, to enable set the enable_advanced_debugging_tools option to true in Mini Profiler config.
  TEXT
end

.authorize_request ⇒ Object 



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# File 'lib/mini_profiler.rb', line 79

def authorize_request
  Thread.current[:mp_authorized] = true
end

.binds_to_params(binds) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 97

def binds_to_params(binds)
  return if binds.nil? || config.max_sql_param_length == 0
  params = binds.map do |c|
    if c.kind_of?(Array)
      [c.first, c.last]
    elsif c.respond_to?(:name) && c.respond_to?(:value) # ActiveRecord::Relation::QueryAttribute
      [c.name, c.value]
    else # Time, String, Integer
      ["param", c]
    end
  end
  if (skip = config.skip_sql_param_names)
    params.map { |(n, v)| n =~ skip ? [n, nil] : [n, v] }
  else
    params
  end
end

.config ⇒ Object

So we can change the configuration if we want



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# File 'lib/mini_profiler.rb', line 40

def config
  @config ||= Config.default
end

.create_current(env = {}, options = {}) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 70

def create_current(env = {}, options = {})
  # profiling the request
  context               = Context.new
  context.inject_js     = config.auto_inject && (!env['HTTP_X_REQUESTED_WITH'].eql? 'XMLHttpRequest')
  context.page_struct   = TimerStruct::Page.new(env)
  context.current_timer = context.page_struct[:root]
  self.current          = context
end

.current ⇒ Object 



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# File 'lib/mini_profiler.rb', line 44

def current
  Thread.current[:mini_profiler_private]
end

.current=(c) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 48

def current=(c)
  # we use TLS cause we need access to this from sql blocks and code blocks that have no access to env
  Thread.current[:mini_profiler_snapshot_custom_fields] = nil
  Thread.current[:mp_ongoing_snapshot] = nil
  Thread.current[:mini_profiler_private] = c
end

.deauthorize_request ⇒ Object 



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# File 'lib/mini_profiler.rb', line 83

def deauthorize_request
  Thread.current[:mp_authorized] = nil
end

.discard_results ⇒ Object

discard existing results, don't track this request



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# File 'lib/mini_profiler.rb', line 66

def discard_results
  self.current.discard = true if current
end

.generate_id ⇒ Object 



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# File 'lib/mini_profiler.rb', line 31

def generate_id
  rand(36**20).to_s(36)
end

.get_snapshot_custom_fields ⇒ Object 



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# File 'lib/mini_profiler.rb', line 61

def get_snapshot_custom_fields
  Thread.current[:mini_profiler_snapshot_custom_fields]
end

.patch_rails? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mini_profiler.rb', line 27

def patch_rails?
  !!defined?(Rack::MINI_PROFILER_ENABLE_RAILS_PATCHES)
end

.redact_sql_queries? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mini_profiler.rb', line 120

def redact_sql_queries?
  Thread.current[:mp_ongoing_snapshot] == true &&
  Rack::MiniProfiler.config.snapshots_redact_sql_queries
end

.request_authorized? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mini_profiler.rb', line 87

def request_authorized?
  Thread.current[:mp_authorized]
end

.reset_config ⇒ Object 



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# File 'lib/mini_profiler.rb', line 35

def reset_config
  @config = Config.default
end

.snapshots_transporter? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mini_profiler.rb', line 115

def snapshots_transporter?
  !!config.snapshots_transport_destination_url &&
  !!config.snapshots_transport_auth_key
end

Instance Method Details

#action_parameters(env) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 427

def action_parameters(env)
  Rack::Utils.parse_nested_query(env['QUERY_STRING'])
end

#advanced_debugging_enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mini_profiler.rb', line 156

def advanced_debugging_enabled?
  config.enable_advanced_debugging_tools
end

#analyze_memory ⇒ Object 



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# File 'lib/mini_profiler.rb', line 533

def analyze_memory
  require 'objspace'

  utf8 = "utf-8"

  GC.start

  trunc = lambda do |str|
    str = str.length > 200 ? str : str[0..200]

    if str.encoding != Encoding::UTF_8
      str = str.dup
      str.force_encoding(utf8)

      unless str.valid_encoding?
        # work around bust string with a double conversion
        str.encode!("utf-16", "utf-8", invalid: :replace)
        str.encode!("utf-8", "utf-16")
      end
    end

    str
  end

  body = "ObjectSpace stats:\n\n".dup

  counts = ObjectSpace.count_objects
  total_strings = counts[:T_STRING]

  body << counts
    .sort { |a, b| b[1] <=> a[1] }
    .map { |k, v| "#{k}: #{v}" }
    .join("\n")

  strings = []
  string_counts = Hash.new(0)
  sample_strings = []

  max_size = 1000
  sample_every = total_strings / max_size

  i = 0
  ObjectSpace.each_object(String) do |str|
    i += 1
    string_counts[str] += 1
    strings << [trunc.call(str), str.length]
    sample_strings << [trunc.call(str), str.length] if i % sample_every == 0
    if strings.length > max_size * 2
      trim_strings(strings, max_size)
    end
  end

  trim_strings(strings, max_size)

  body << "\n\n\n1000 Largest strings:\n\n"
  body << strings.map { |s, len| "#{s[0..1000]}\n(len: #{len})\n\n" }.join("\n")

  body << "\n\n\n1000 Sample strings:\n\n"
  body << sample_strings.map { |s, len| "#{s[0..1000]}\n(len: #{len})\n\n" }.join("\n")

  body << "\n\n\n1000 Most common strings:\n\n"
  body << string_counts.sort { |a, b| b[1] <=> a[1] }[0..max_size].map { |s, len| "#{trunc.call(s)}\n(x #{len})\n\n" }.join("\n")

  text_result(body)
end

#cache_control_value ⇒ Object 



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# File 'lib/mini_profiler.rb', line 626

def cache_control_value
  86400
end

#call(env) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 164

def call(env)
  start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  client_settings = ClientSettings.new(env, @storage, start)
  MiniProfiler.deauthorize_request if @config.authorization_mode == :allow_authorized

  status = headers = body = nil
  path         = env['PATH_INFO'].sub('//', '/')

  # Someone (e.g. Rails engine) could change the SCRIPT_NAME so we save it
  env['RACK_MINI_PROFILER_ORIGINAL_SCRIPT_NAME'] = ENV['PASSENGER_BASE_URI'] || env['SCRIPT_NAME']

  skip_it = matches_action?('skip', env) || (
    @config.skip_paths &&
    @config.skip_paths.any? do |p|
      if p.instance_of?(String)
        path.start_with?(p)
      elsif p.instance_of?(Regexp)
        p.match?(path)
      end
    end
  )
  if skip_it
    # preserve_cookie to ensure we don't deauthorize the request (delete the auth cookie) when loading assets
    return client_settings.handle_cookie(@app.call(env), preserve_cookie: true)
  end

  skip_it = (@config.pre_authorize_cb && !@config.pre_authorize_cb.call(env))

  if skip_it || (
    @config.authorization_mode == :allow_authorized &&
    !client_settings.has_valid_cookie?
  )
    if take_snapshot?(path)
      return client_settings.handle_cookie(take_snapshot(env, start))
    else
      return client_settings.handle_cookie(@app.call(env))
    end
  end

  # handle all /mini-profiler requests here
  if path.start_with? @config.base_url_path
    file_name = path.sub(@config.base_url_path, '')

    case file_name
    when 'results'
      return serve_results(env)
    when 'snapshots'
      self.current = nil
      return serve_snapshot(env)
    when 'flamegraph'
      return serve_flamegraph(env)
    end

    return client_settings.handle_cookie(serve_file(env, file_name: file_name))
  end

  has_disable_cookie = client_settings.disable_profiling?
  # manual session disable / enable
  if matches_action?('disable', env) || has_disable_cookie
    skip_it = true
  end

  if matches_action?('enable', env)
    skip_it = false
    config.enabled = true
  end

  if skip_it || !config.enabled
    status, headers, body = @app.call(env)
    client_settings.disable_profiling = true
    return client_settings.handle_cookie([status, headers, body])
  end

  # remember that profiling is not disabled (ie enabled)
  client_settings.disable_profiling = false

  # profile gc
  if matches_action?('profile-gc', env)
    current.measure = false if current
    return serve_profile_gc(env, client_settings)
  end

  # profile memory
  if matches_action?('profile-memory', env)
    return serve_profile_memory(env, client_settings)
  end

  # any other requests past this point are going to the app to be profiled

  MiniProfiler.create_current(env, @config)

  if matches_action?('normal-backtrace', env)
    client_settings.backtrace_level = ClientSettings::BACKTRACE_DEFAULT
  elsif matches_action?('no-backtrace', env)
    current.skip_backtrace = true
    client_settings.backtrace_level = ClientSettings::BACKTRACE_NONE
  elsif matches_action?('full-backtrace', env) || client_settings.backtrace_full?
    current.full_backtrace = true
    client_settings.backtrace_level = ClientSettings::BACKTRACE_FULL
  elsif client_settings.backtrace_none?
    current.skip_backtrace = true
  end

  flamegraph = nil

  trace_exceptions = matches_action?('trace-exceptions', env) && defined? TracePoint
  status, headers, body, exceptions, trace = nil

  if trace_exceptions
    exceptions = []
    trace      = TracePoint.new(:raise) do |tp|
      exceptions << tp.raised_exception
    end
    trace.enable
  end

  begin

    # Strip all the caching headers so we don't get 304s back
    #  This solves a very annoying bug where rack mini profiler never shows up
    if config.disable_caching
      env['HTTP_IF_MODIFIED_SINCE'] = ''
      env['HTTP_IF_NONE_MATCH']     = ''
    end

    orig_accept_encoding = env['HTTP_ACCEPT_ENCODING']
    # Prevent response body from being compressed
    env['HTTP_ACCEPT_ENCODING'] = 'identity' if config.suppress_encoding

    if matches_action?('flamegraph', env) || matches_action?('async-flamegraph', env) || env['HTTP_REFERER'] =~ /pp=async-flamegraph/
      if defined?(StackProf) && StackProf.respond_to?(:run)
        # do not sully our profile with mini profiler timings
        current.measure = false
        match_data      = action_parameters(env)['flamegraph_sample_rate']

        if match_data && !match_data[1].to_f.zero?
          sample_rate = match_data[1].to_f
        else
          sample_rate = config.flamegraph_sample_rate
        end

        mode_match_data = action_parameters(env)['flamegraph_mode']

        if mode_match_data && [:cpu, :wall, :object, :custom].include?(mode_match_data.to_sym)
          mode = mode_match_data.to_sym
        else
          mode = config.flamegraph_mode
        end

        ignore_gc_match_data = action_parameters(env)['flamegraph_ignore_gc']

        if ignore_gc_match_data
          ignore_gc = ignore_gc_match_data == 'true'
        else
          ignore_gc = config.flamegraph_ignore_gc
        end

        flamegraph = StackProf.run(
          mode: mode,
          raw: true,
          aggregate: false,
          interval: (sample_rate * 1000).to_i,
          ignore_gc: ignore_gc
        ) do
          status, headers, body = @app.call(env)
        end
      else
        message = "Please install the stackprof gem and require it: add gem 'stackprof' to your Gemfile"
        status, headers, body = @app.call(env)
        body.close if body.respond_to? :close

        return client_settings.handle_cookie(
          text_result(message, status: status, headers: headers)
        )
      end
    elsif path == '/rack-mini-profiler/requests'
      status, headers, body = [200, { Rack::CONTENT_TYPE => 'text/html' }, [blank_page_html.dup]] # important to dup here!
    else
      status, headers, body = @app.call(env)
    end
  ensure
    trace.disable if trace
    env['HTTP_ACCEPT_ENCODING'] = orig_accept_encoding if config.suppress_encoding
  end

  skip_it = current.discard

  if (config.authorization_mode == :allow_authorized && !MiniProfiler.request_authorized?)
    skip_it = true
  end

  return client_settings.handle_cookie([status, headers, body]) if skip_it

  # we must do this here, otherwise current[:discard] is not being properly treated
  if trace_exceptions
    body.close if body.respond_to? :close

    query_params = action_parameters(env)
    trace_exceptions_filter = query_params['trace_exceptions_filter']
    if trace_exceptions_filter
      trace_exceptions_regex = Regexp.new(trace_exceptions_filter)
      exceptions.reject! { |ex| ex.class.name =~ trace_exceptions_regex }
    end

    return client_settings.handle_cookie(dump_exceptions exceptions)
  end

  if matches_action?("env", env)
    return tool_disabled_message(client_settings) if !advanced_debugging_enabled?
    body.close if body.respond_to? :close
    return client_settings.handle_cookie(dump_env env)
  end

  if matches_action?("analyze-memory", env)
    return tool_disabled_message(client_settings) if !advanced_debugging_enabled?
    body.close if body.respond_to? :close
    return client_settings.handle_cookie(analyze_memory)
  end

  if matches_action?("help", env)
    body.close if body.respond_to? :close
    return client_settings.handle_cookie(help(client_settings, env))
  end

  page_struct = current.page_struct
  page_struct[:user] = user(env)
  page_struct[:root].record_time((Process.clock_gettime(Process::CLOCK_MONOTONIC) - start) * 1000)

  if flamegraph && matches_action?("flamegraph", env)
    body.close if body.respond_to? :close
    return client_settings.handle_cookie(self.flamegraph(flamegraph, path, env))
  elsif flamegraph # async-flamegraph
    page_struct[:has_flamegraph] = true
    page_struct[:flamegraph] = flamegraph
  end

  begin
    @storage.save(page_struct)
    # no matter what it is, it should be unviewed, otherwise we will miss POST
    @storage.set_unviewed(page_struct[:user], page_struct[:id])

    # inject headers, script
    if status >= 200 && status < 300
      result = inject_profiler(env, status, headers, body)
      return client_settings.handle_cookie(result) if result
    end
  rescue Exception => e
    if @config.storage_failure != nil
      @config.storage_failure.call(e)
    end
  end

  client_settings.handle_cookie([status, headers, body])
ensure
  # Make sure this always happens
  self.current = nil
end

#cancel_auto_inject(env) ⇒ Object

cancels automatic injection of profile script for the current page



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# File 'lib/mini_profiler.rb', line 622

def cancel_auto_inject(env)
  current.inject_js = false
end

#config ⇒ Object 



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# File 'lib/mini_profiler.rb', line 152

def config
  @config
end

#current ⇒ Object 



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# File 'lib/mini_profiler.rb', line 144

def current
  MiniProfiler.current
end

#current=(c) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 148

def current=(c)
  MiniProfiler.current = c
end

#dump_env(env) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 505

def dump_env(env)
  body = "Rack Environment\n---------------\n".dup
  env.each do |k, v|
    body << "#{k}: #{v}\n"
  end

  body << "\n\nEnvironment\n---------------\n"
  ENV.each do |k, v|
    body << "#{k}: #{v}\n"
  end

  body << "\n\nRuby Version\n---------------\n"
  body << "#{RUBY_VERSION} p#{RUBY_PATCHLEVEL}\n"

  body << "\n\nInternals\n---------------\n"
  body << "Storage Provider #{config.storage_instance}\n"
  body << "User #{user(env)}\n"
  body << config.storage_instance.diagnostics(user(env)) rescue "no diagnostics implemented for storage"

  text_result(body)
end

#dump_exceptions(exceptions) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 487

def dump_exceptions(exceptions)
  body = "Exceptions raised during request\n\n".dup
  if exceptions.empty?
    body << "No exceptions raised"
  else
    body << "Exceptions: (#{exceptions.size} total)\n"
    exceptions.group_by(&:class).each do |klass, exceptions_per_class|
      body << "  #{klass.name} (#{exceptions_per_class.size})\n"
    end

    body << "\nBacktraces\n"
    exceptions.each_with_index do |e, i|
      body << "##{i + 1}: #{e.class} - \"#{e.message.lines.first.chomp}\"\n  #{e.backtrace.join("\n  ")}\n\n"
    end
  end
  text_result(body)
end

#flamegraph_path(env) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 617

def flamegraph_path(env)
  @config.base_url_path + 'flamegraph?id=' + current.page_struct[:id]
end

#ids(env) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 604

def ids(env)
  all = ([current.page_struct[:id]] + (@storage.get_unviewed_ids(user(env)) || [])).uniq
  if all.size > @config.max_traces_to_show
    all = all[0...@config.max_traces_to_show]
    @storage.set_all_unviewed(user(env), all)
  end
  all
end

#ids_comma_separated(env) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 613

def ids_comma_separated(env)
  ids(env).join(",")
end

#inject(fragment, script) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 466

def inject(fragment, script)
  # find explicit or implicit body
  index = fragment.rindex(/<\/body>/i) || fragment.rindex(/<\/html>/i)
  if index
    # if for whatever crazy reason we dont get a utf string,
    #   just force the encoding, no utf in the mp scripts anyway
    if script.respond_to?(:encoding) && script.respond_to?(:force_encoding)
      script = script.force_encoding(fragment.encoding)
    end

    safe_script = script
    if script.respond_to?(:html_safe)
      safe_script = script.html_safe
    end

    fragment.insert(index, safe_script)
  else
    fragment
  end
end

#inject_profiler(env, status, headers, body) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 431

def inject_profiler(env, status, headers, body)
  # mini profiler is meddling with stuff, we can not cache cause we will get incorrect data
  # Rack::ETag has already inserted some nonesense in the chain
  content_type = headers[Rack::CONTENT_TYPE]

  headers['x-miniprofiler-original-cache-control'] = headers[Rack::CACHE_CONTROL] unless headers[Rack::CACHE_CONTROL].nil?

  if config.disable_caching
    headers.delete(Rack::ETAG)
    headers.delete('date') || headers.delete('Date')
    headers[Rack::CACHE_CONTROL] = "no-store, must-revalidate, private, max-age=0"
  end

  # inject header
  if headers.is_a? Hash
    headers['x-miniprofiler-ids'] = ids_comma_separated(env)
    headers['x-miniprofiler-flamegraph-path'] = flamegraph_path(env) if current.page_struct[:has_flamegraph]
  end

  if current.inject_js && content_type =~ /text\/html/
    response = Rack::Response.new([], status, headers)
    script   = self.get_profile_script(env, headers)

    if String === body
      response.write inject(body, script)
    else
      body.each { |fragment| response.write inject(fragment, script) }
    end
    body.close if body.respond_to? :close
    response.finish
  else
    nil
  end
end

#matches_action?(action, env) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mini_profiler.rb', line 422

def matches_action?(action, env)
  env['QUERY_STRING'] =~ /#{@config.profile_parameter}=#{action}/ ||
    env['HTTP_X_RACK_MINI_PROFILER'] == action
end

#text_result(body, status: 200, headers: nil) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 599

def text_result(body, status: 200, headers: nil)
  headers = (headers || {}).merge(Rack::CONTENT_TYPE => 'text/plain; charset=utf-8')
  [status, headers, [body]]
end

#tool_disabled_message(client_settings) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 160

def tool_disabled_message(client_settings)
  client_settings.handle_cookie(text_result(Rack::MiniProfiler.advanced_tools_message))
end

#trim_strings(strings, max_size) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 527

def trim_strings(strings, max_size)
  strings.sort! { |a, b| b[1] <=> a[1] }
  i = 0
  strings.delete_if { |_| (i += 1) > max_size }
end

#user(env) ⇒ Object 



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# File 'lib/mini_profiler.rb', line 140

def user(env)
  @config.user_provider.call(env)
end