2018-12-13 13:39:08 +05:30
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# frozen_string_literal: true
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2017-09-10 17:25:29 +05:30
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require 'base64'
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2017-08-17 22:00:37 +05:30
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require 'gitaly'
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2018-03-17 18:26:18 +05:30
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require 'grpc/health/v1/health_pb'
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require 'grpc/health/v1/health_services_pb'
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2017-08-17 22:00:37 +05:30
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module Gitlab
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module GitalyClient
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2018-03-17 18:26:18 +05:30
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include Gitlab::Metrics::Methods
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2017-09-10 17:25:29 +05:30
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module MigrationStatus
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DISABLED = 1
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OPT_IN = 2
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OPT_OUT = 3
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end
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2018-03-17 18:26:18 +05:30
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class TooManyInvocationsError < StandardError
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attr_reader :call_site, :invocation_count, :max_call_stack
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def initialize(call_site, invocation_count, max_call_stack, most_invoked_stack)
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@call_site = call_site
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@invocation_count = invocation_count
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@max_call_stack = max_call_stack
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stacks = most_invoked_stack.join('\n') if most_invoked_stack
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msg = "GitalyClient##{call_site} called #{invocation_count} times from single request. Potential n+1?"
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2018-12-13 13:39:08 +05:30
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msg = "#{msg}\nThe following call site called into Gitaly #{max_call_stack} times:\n#{stacks}\n" if stacks
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2018-03-17 18:26:18 +05:30
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super(msg)
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end
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end
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2017-08-17 22:00:37 +05:30
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SERVER_VERSION_FILE = 'GITALY_SERVER_VERSION'.freeze
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2018-03-17 18:26:18 +05:30
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MAXIMUM_GITALY_CALLS = 35
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CLIENT_NAME = (Sidekiq.server? ? 'gitlab-sidekiq' : 'gitlab-web').freeze
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2017-08-17 22:00:37 +05:30
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MUTEX = Mutex.new
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2018-03-17 18:26:18 +05:30
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class << self
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attr_accessor :query_time
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end
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self.query_time = 0
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define_histogram :gitaly_migrate_call_duration_seconds do
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docstring "Gitaly migration call execution timings"
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base_labels gitaly_enabled: nil, feature: nil
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end
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define_histogram :gitaly_controller_action_duration_seconds do
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docstring "Gitaly endpoint histogram by controller and action combination"
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base_labels Gitlab::Metrics::Transaction::BASE_LABELS.merge(gitaly_service: nil, rpc: nil)
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end
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2017-08-17 22:00:37 +05:30
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def self.stub(name, storage)
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MUTEX.synchronize do
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@stubs ||= {}
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@stubs[storage] ||= {}
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@stubs[storage][name] ||= begin
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2018-03-17 18:26:18 +05:30
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klass = stub_class(name)
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addr = stub_address(storage)
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2017-08-17 22:00:37 +05:30
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klass.new(addr, :this_channel_is_insecure)
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end
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end
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end
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2018-03-17 18:26:18 +05:30
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def self.stub_class(name)
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if name == :health_check
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Grpc::Health::V1::Health::Stub
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else
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Gitaly.const_get(name.to_s.camelcase.to_sym).const_get(:Stub)
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end
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end
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def self.stub_address(storage)
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addr = address(storage)
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addr = addr.sub(%r{^tcp://}, '') if URI(addr).scheme == 'tcp'
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addr
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end
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2017-08-17 22:00:37 +05:30
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def self.clear_stubs!
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MUTEX.synchronize do
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@stubs = nil
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end
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end
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2018-05-09 12:01:36 +05:30
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def self.random_storage
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Gitlab.config.repositories.storages.keys.sample
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end
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2017-08-17 22:00:37 +05:30
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def self.address(storage)
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params = Gitlab.config.repositories.storages[storage]
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raise "storage not found: #{storage.inspect}" if params.nil?
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address = params['gitaly_address']
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unless address.present?
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raise "storage #{storage.inspect} is missing a gitaly_address"
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end
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unless URI(address).scheme.in?(%w(tcp unix))
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raise "Unsupported Gitaly address: #{address.inspect} does not use URL scheme 'tcp' or 'unix'"
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end
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address
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end
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2018-03-17 18:26:18 +05:30
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def self.address_metadata(storage)
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Base64.strict_encode64(JSON.dump({ storage => { 'address' => address(storage), 'token' => token(storage) } }))
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end
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2017-09-10 17:25:29 +05:30
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# All Gitaly RPC call sites should use GitalyClient.call. This method
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# makes sure that per-request authentication headers are set.
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2018-03-17 18:26:18 +05:30
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#
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# This method optionally takes a block which receives the keyword
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# arguments hash 'kwargs' that will be passed to gRPC. This allows the
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# caller to modify or augment the keyword arguments. The block must
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# return a hash.
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#
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# For example:
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#
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# GitalyClient.call(storage, service, rpc, request) do |kwargs|
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# kwargs.merge(deadline: Time.now + 10)
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# end
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#
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def self.call(storage, service, rpc, request, remote_storage: nil, timeout: nil)
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start = Gitlab::Metrics::System.monotonic_time
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2018-05-09 12:01:36 +05:30
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request_hash = request.is_a?(Google::Protobuf::MessageExts) ? request.to_h : {}
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@current_call_id ||= SecureRandom.uuid
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2018-03-17 18:26:18 +05:30
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enforce_gitaly_request_limits(:call)
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kwargs = request_kwargs(storage, timeout, remote_storage: remote_storage)
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kwargs = yield(kwargs) if block_given?
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stub(service, storage).__send__(rpc, request, kwargs) # rubocop:disable GitlabSecurity/PublicSend
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rescue GRPC::Unavailable => ex
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handle_grpc_unavailable!(ex)
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ensure
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duration = Gitlab::Metrics::System.monotonic_time - start
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# Keep track, seperately, for the performance bar
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self.query_time += duration
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gitaly_controller_action_duration_seconds.observe(
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current_transaction_labels.merge(gitaly_service: service.to_s, rpc: rpc.to_s),
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duration)
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2018-05-09 12:01:36 +05:30
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add_call_details(id: @current_call_id, feature: service, duration: duration, request: request_hash)
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@current_call_id = nil
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2017-08-17 22:00:37 +05:30
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end
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2018-03-17 18:26:18 +05:30
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def self.handle_grpc_unavailable!(ex)
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status = ex.to_status
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raise ex unless status.details == 'Endpoint read failed'
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# There is a bug in grpc 1.8.x that causes a client process to get stuck
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# always raising '14:Endpoint read failed'. The only thing that we can
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# do to recover is to restart the process.
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#
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# See https://gitlab.com/gitlab-org/gitaly/issues/1029
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if Sidekiq.server?
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raise Gitlab::SidekiqMiddleware::Shutdown::WantShutdown.new(ex.to_s)
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else
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# SIGQUIT requests a Unicorn worker to shut down gracefully after the current request.
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Process.kill('QUIT', Process.pid)
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end
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raise ex
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end
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private_class_method :handle_grpc_unavailable!
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def self.current_transaction_labels
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Gitlab::Metrics::Transaction.current&.labels || {}
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end
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private_class_method :current_transaction_labels
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2018-12-05 23:21:45 +05:30
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# For some time related tasks we can't rely on `Time.now` since it will be
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# affected by Timecop in some tests, and the clock of some gitaly-related
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# components (grpc's c-core and gitaly server) use system time instead of
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# timecop's time, so tests will fail.
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# `Time.at(Process.clock_gettime(Process::CLOCK_REALTIME))` will circumvent
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# timecop.
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def self.real_time
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Time.at(Process.clock_gettime(Process::CLOCK_REALTIME))
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end
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private_class_method :real_time
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def self.authorization_token(storage)
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token = token(storage).to_s
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issued_at = real_time.to_i.to_s
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hmac = OpenSSL::HMAC.hexdigest(OpenSSL::Digest::SHA256.new, token, issued_at)
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"v2.#{hmac}.#{issued_at}"
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end
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private_class_method :authorization_token
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2018-03-17 18:26:18 +05:30
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def self.request_kwargs(storage, timeout, remote_storage: nil)
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metadata = {
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2018-12-05 23:21:45 +05:30
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'authorization' => "Bearer #{authorization_token(storage)}",
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2018-03-17 18:26:18 +05:30
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'client_name' => CLIENT_NAME
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}
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feature_stack = Thread.current[:gitaly_feature_stack]
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feature = feature_stack && feature_stack[0]
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metadata['call_site'] = feature.to_s if feature
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metadata['gitaly-servers'] = address_metadata(remote_storage) if remote_storage
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2018-11-08 19:23:39 +05:30
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metadata.merge!(server_feature_flags)
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2018-03-17 18:26:18 +05:30
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result = { metadata: metadata }
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# nil timeout indicates that we should use the default
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timeout = default_timeout if timeout.nil?
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return result unless timeout > 0
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2018-12-05 23:21:45 +05:30
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deadline = real_time + timeout
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2018-03-17 18:26:18 +05:30
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result[:deadline] = deadline
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result
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2017-08-17 22:00:37 +05:30
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end
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2018-12-05 23:21:45 +05:30
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SERVER_FEATURE_FLAGS = %w[gogit_findcommit].freeze
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2018-11-08 19:23:39 +05:30
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def self.server_feature_flags
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SERVER_FEATURE_FLAGS.map do |f|
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["gitaly-feature-#{f.tr('_', '-')}", feature_enabled?(f).to_s]
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end.to_h
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end
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2017-09-10 17:25:29 +05:30
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def self.token(storage)
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params = Gitlab.config.repositories.storages[storage]
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raise "storage not found: #{storage.inspect}" if params.nil?
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params['gitaly_token'].presence || Gitlab.config.gitaly['token']
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end
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2018-03-17 18:26:18 +05:30
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# Evaluates whether a feature toggle is on or off
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def self.feature_enabled?(feature_name, status: MigrationStatus::OPT_IN)
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# Disabled features are always off!
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2017-09-10 17:25:29 +05:30
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return false if status == MigrationStatus::DISABLED
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2018-03-17 18:26:18 +05:30
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feature = Feature.get("gitaly_#{feature_name}")
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# If the feature has been set, always evaluate
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if Feature.persisted?(feature)
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if feature.percentage_of_time_value > 0
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# Probabilistically enable this feature
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return Random.rand() * 100 < feature.percentage_of_time_value
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end
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2017-09-10 17:25:29 +05:30
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2018-03-17 18:26:18 +05:30
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return feature.enabled?
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end
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2017-09-10 17:25:29 +05:30
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2018-03-17 18:26:18 +05:30
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# If the feature has not been set, the default depends
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# on it's status
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case status
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when MigrationStatus::OPT_OUT
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true
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when MigrationStatus::OPT_IN
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2018-11-08 19:23:39 +05:30
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opt_into_all_features? && !explicit_opt_in_required.include?(feature_name)
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2018-03-17 18:26:18 +05:30
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else
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false
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2017-09-10 17:25:29 +05:30
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end
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2018-11-08 19:23:39 +05:30
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rescue => ex
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# During application startup feature lookups in SQL can fail
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Rails.logger.warn "exception while checking Gitaly feature status for #{feature_name}: #{ex}"
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false
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end
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# We have a mechanism to let GitLab automatically opt in to all Gitaly
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# features. We want to be able to exclude some features from automatic
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# opt-in. This function has an override in EE.
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def self.explicit_opt_in_required
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[]
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2018-03-17 18:26:18 +05:30
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end
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2017-09-10 17:25:29 +05:30
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2018-03-17 18:26:18 +05:30
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# opt_into_all_features? returns true when the current environment
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# is one in which we opt into features automatically
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def self.opt_into_all_features?
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Rails.env.development? || ENV["GITALY_FEATURE_DEFAULT_ON"] == "1"
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2017-09-10 17:25:29 +05:30
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end
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2018-03-17 18:26:18 +05:30
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private_class_method :opt_into_all_features?
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2017-09-10 17:25:29 +05:30
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def self.migrate(feature, status: MigrationStatus::OPT_IN)
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2018-03-17 18:26:18 +05:30
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# Enforce limits at both the `migrate` and `call` sites to ensure that
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# problems are not hidden by a feature being disabled
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enforce_gitaly_request_limits(:migrate)
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2017-09-10 17:25:29 +05:30
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is_enabled = feature_enabled?(feature, status: status)
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2017-08-17 22:00:37 +05:30
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metric_name = feature.to_s
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metric_name += "_gitaly" if is_enabled
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Gitlab::Metrics.measure(metric_name) do
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2018-03-17 18:26:18 +05:30
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# Some migrate calls wrap other migrate calls
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allow_n_plus_1_calls do
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feature_stack = Thread.current[:gitaly_feature_stack] ||= []
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feature_stack.unshift(feature)
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begin
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start = Gitlab::Metrics::System.monotonic_time
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2018-05-09 12:01:36 +05:30
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@current_call_id = SecureRandom.uuid
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call_details = { id: @current_call_id }
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2018-03-17 18:26:18 +05:30
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yield is_enabled
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ensure
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total_time = Gitlab::Metrics::System.monotonic_time - start
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gitaly_migrate_call_duration_seconds.observe({ gitaly_enabled: is_enabled, feature: feature }, total_time)
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feature_stack.shift
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Thread.current[:gitaly_feature_stack] = nil if feature_stack.empty?
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2018-05-09 12:01:36 +05:30
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add_call_details(call_details.merge(feature: feature, duration: total_time))
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2018-03-17 18:26:18 +05:30
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end
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end
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end
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end
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# Ensures that Gitaly is not being abuse through n+1 misuse etc
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def self.enforce_gitaly_request_limits(call_site)
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# Only count limits in request-response environments (not sidekiq for example)
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2018-12-05 23:21:45 +05:30
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return unless Gitlab::SafeRequestStore.active?
|
2018-03-17 18:26:18 +05:30
|
|
|
|
|
|
|
# This is this actual number of times this call was made. Used for information purposes only
|
|
|
|
actual_call_count = increment_call_count("gitaly_#{call_site}_actual")
|
|
|
|
|
|
|
|
# Do no enforce limits in production
|
|
|
|
return if Rails.env.production? || ENV["GITALY_DISABLE_REQUEST_LIMITS"]
|
|
|
|
|
|
|
|
# Check if this call is nested within a allow_n_plus_1_calls
|
|
|
|
# block and skip check if it is
|
|
|
|
return if get_call_count(:gitaly_call_count_exception_block_depth) > 0
|
|
|
|
|
|
|
|
# This is the count of calls outside of a `allow_n_plus_1_calls` block
|
|
|
|
# It is used for enforcement but not statistics
|
|
|
|
permitted_call_count = increment_call_count("gitaly_#{call_site}_permitted")
|
|
|
|
|
|
|
|
count_stack
|
|
|
|
|
|
|
|
return if permitted_call_count <= MAXIMUM_GITALY_CALLS
|
|
|
|
|
|
|
|
raise TooManyInvocationsError.new(call_site, actual_call_count, max_call_count, max_stacks)
|
|
|
|
end
|
|
|
|
|
|
|
|
def self.allow_n_plus_1_calls
|
2018-12-05 23:21:45 +05:30
|
|
|
return yield unless Gitlab::SafeRequestStore.active?
|
2018-03-17 18:26:18 +05:30
|
|
|
|
|
|
|
begin
|
|
|
|
increment_call_count(:gitaly_call_count_exception_block_depth)
|
|
|
|
yield
|
|
|
|
ensure
|
|
|
|
decrement_call_count(:gitaly_call_count_exception_block_depth)
|
|
|
|
end
|
|
|
|
end
|
|
|
|
|
|
|
|
def self.get_call_count(key)
|
2018-12-05 23:21:45 +05:30
|
|
|
Gitlab::SafeRequestStore[key] || 0
|
2018-03-17 18:26:18 +05:30
|
|
|
end
|
|
|
|
private_class_method :get_call_count
|
|
|
|
|
|
|
|
def self.increment_call_count(key)
|
2018-12-05 23:21:45 +05:30
|
|
|
Gitlab::SafeRequestStore[key] ||= 0
|
|
|
|
Gitlab::SafeRequestStore[key] += 1
|
2018-03-17 18:26:18 +05:30
|
|
|
end
|
|
|
|
private_class_method :increment_call_count
|
|
|
|
|
|
|
|
def self.decrement_call_count(key)
|
2018-12-05 23:21:45 +05:30
|
|
|
Gitlab::SafeRequestStore[key] -= 1
|
2018-03-17 18:26:18 +05:30
|
|
|
end
|
|
|
|
private_class_method :decrement_call_count
|
|
|
|
|
|
|
|
# Returns an estimate of the number of Gitaly calls made for this
|
|
|
|
# request
|
|
|
|
def self.get_request_count
|
2018-12-05 23:21:45 +05:30
|
|
|
return 0 unless Gitlab::SafeRequestStore.active?
|
2018-03-17 18:26:18 +05:30
|
|
|
|
|
|
|
gitaly_migrate_count = get_call_count("gitaly_migrate_actual")
|
|
|
|
gitaly_call_count = get_call_count("gitaly_call_actual")
|
|
|
|
|
|
|
|
# Using the maximum of migrate and call_count will provide an
|
|
|
|
# indicator of how many Gitaly calls will be made, even
|
|
|
|
# before a feature is enabled. This provides us with a single
|
|
|
|
# metric, but not an exact number, but this tradeoff is acceptable
|
|
|
|
if gitaly_migrate_count > gitaly_call_count
|
|
|
|
gitaly_migrate_count
|
|
|
|
else
|
|
|
|
gitaly_call_count
|
|
|
|
end
|
|
|
|
end
|
|
|
|
|
|
|
|
def self.reset_counts
|
2018-12-05 23:21:45 +05:30
|
|
|
return unless Gitlab::SafeRequestStore.active?
|
2018-03-17 18:26:18 +05:30
|
|
|
|
|
|
|
%w[migrate call].each do |call_site|
|
2018-12-05 23:21:45 +05:30
|
|
|
Gitlab::SafeRequestStore["gitaly_#{call_site}_actual"] = 0
|
|
|
|
Gitlab::SafeRequestStore["gitaly_#{call_site}_permitted"] = 0
|
2017-08-17 22:00:37 +05:30
|
|
|
end
|
|
|
|
end
|
|
|
|
|
2018-05-09 12:01:36 +05:30
|
|
|
def self.add_call_details(details)
|
|
|
|
id = details.delete(:id)
|
|
|
|
|
2018-12-05 23:21:45 +05:30
|
|
|
return unless id && Gitlab::SafeRequestStore[:peek_enabled]
|
2018-05-09 12:01:36 +05:30
|
|
|
|
2018-12-05 23:21:45 +05:30
|
|
|
Gitlab::SafeRequestStore['gitaly_call_details'] ||= {}
|
|
|
|
Gitlab::SafeRequestStore['gitaly_call_details'][id] ||= {}
|
|
|
|
Gitlab::SafeRequestStore['gitaly_call_details'][id].merge!(details)
|
2018-05-09 12:01:36 +05:30
|
|
|
end
|
|
|
|
|
|
|
|
def self.list_call_details
|
2018-12-05 23:21:45 +05:30
|
|
|
return {} unless Gitlab::SafeRequestStore[:peek_enabled]
|
2018-05-09 12:01:36 +05:30
|
|
|
|
2018-12-05 23:21:45 +05:30
|
|
|
Gitlab::SafeRequestStore['gitaly_call_details'] || {}
|
2018-05-09 12:01:36 +05:30
|
|
|
end
|
|
|
|
|
2017-08-17 22:00:37 +05:30
|
|
|
def self.expected_server_version
|
|
|
|
path = Rails.root.join(SERVER_VERSION_FILE)
|
|
|
|
path.read.chomp
|
|
|
|
end
|
2017-09-10 17:25:29 +05:30
|
|
|
|
2018-11-18 11:00:15 +05:30
|
|
|
def self.timestamp(time)
|
|
|
|
Google::Protobuf::Timestamp.new(seconds: time.to_i)
|
2018-03-17 18:26:18 +05:30
|
|
|
end
|
|
|
|
|
|
|
|
# The default timeout on all Gitaly calls
|
|
|
|
def self.default_timeout
|
2018-11-08 19:23:39 +05:30
|
|
|
return no_timeout if Sidekiq.server?
|
2018-03-17 18:26:18 +05:30
|
|
|
|
|
|
|
timeout(:gitaly_timeout_default)
|
|
|
|
end
|
|
|
|
|
|
|
|
def self.fast_timeout
|
|
|
|
timeout(:gitaly_timeout_fast)
|
|
|
|
end
|
|
|
|
|
|
|
|
def self.medium_timeout
|
|
|
|
timeout(:gitaly_timeout_medium)
|
|
|
|
end
|
|
|
|
|
2018-11-08 19:23:39 +05:30
|
|
|
def self.no_timeout
|
|
|
|
0
|
|
|
|
end
|
|
|
|
|
2018-03-17 18:26:18 +05:30
|
|
|
def self.timeout(timeout_name)
|
|
|
|
Gitlab::CurrentSettings.current_application_settings[timeout_name]
|
|
|
|
end
|
|
|
|
private_class_method :timeout
|
|
|
|
|
|
|
|
# Count a stack. Used for n+1 detection
|
|
|
|
def self.count_stack
|
2018-12-05 23:21:45 +05:30
|
|
|
return unless Gitlab::SafeRequestStore.active?
|
2018-03-17 18:26:18 +05:30
|
|
|
|
2018-11-08 19:23:39 +05:30
|
|
|
stack_string = Gitlab::Profiler.clean_backtrace(caller).drop(1).join("\n")
|
2018-03-17 18:26:18 +05:30
|
|
|
|
2018-12-05 23:21:45 +05:30
|
|
|
Gitlab::SafeRequestStore[:stack_counter] ||= Hash.new
|
2018-03-17 18:26:18 +05:30
|
|
|
|
2018-12-05 23:21:45 +05:30
|
|
|
count = Gitlab::SafeRequestStore[:stack_counter][stack_string] || 0
|
|
|
|
Gitlab::SafeRequestStore[:stack_counter][stack_string] = count + 1
|
2018-03-17 18:26:18 +05:30
|
|
|
end
|
|
|
|
private_class_method :count_stack
|
|
|
|
|
|
|
|
# Returns a count for the stack which called Gitaly the most times. Used for n+1 detection
|
|
|
|
def self.max_call_count
|
2018-12-05 23:21:45 +05:30
|
|
|
return 0 unless Gitlab::SafeRequestStore.active?
|
2018-03-17 18:26:18 +05:30
|
|
|
|
2018-12-05 23:21:45 +05:30
|
|
|
stack_counter = Gitlab::SafeRequestStore[:stack_counter]
|
2018-03-17 18:26:18 +05:30
|
|
|
return 0 unless stack_counter
|
|
|
|
|
|
|
|
stack_counter.values.max
|
|
|
|
end
|
|
|
|
private_class_method :max_call_count
|
|
|
|
|
|
|
|
# Returns the stacks that calls Gitaly the most times. Used for n+1 detection
|
|
|
|
def self.max_stacks
|
2018-12-05 23:21:45 +05:30
|
|
|
return nil unless Gitlab::SafeRequestStore.active?
|
2018-03-17 18:26:18 +05:30
|
|
|
|
2018-12-05 23:21:45 +05:30
|
|
|
stack_counter = Gitlab::SafeRequestStore[:stack_counter]
|
2018-03-17 18:26:18 +05:30
|
|
|
return nil unless stack_counter
|
|
|
|
|
|
|
|
max = max_call_count
|
|
|
|
return nil if max.zero?
|
|
|
|
|
|
|
|
stack_counter.select { |_, v| v == max }.keys
|
2017-09-10 17:25:29 +05:30
|
|
|
end
|
2018-03-17 18:26:18 +05:30
|
|
|
private_class_method :max_stacks
|
2017-08-17 22:00:37 +05:30
|
|
|
end
|
|
|
|
end
|