debian-mirror-gitlab/lib/gitlab/metrics/requests_rack_middleware.rb

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# frozen_string_literal: true
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module Gitlab
module Metrics
class RequestsRackMiddleware
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HTTP_METHODS = {
"delete" => %w(200 202 204 303 400 401 403 404 500 503),
"get" => %w(200 204 301 302 303 304 307 400 401 403 404 410 422 429 500 503),
"head" => %w(200 204 301 302 303 401 403 404 410 500),
"options" => %w(200 404),
"patch" => %w(200 202 204 400 403 404 409 416 500),
"post" => %w(200 201 202 204 301 302 303 304 400 401 403 404 406 409 410 412 422 429 500 503),
"put" => %w(200 202 204 400 401 403 404 405 406 409 410 422 500)
}.freeze
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HEALTH_ENDPOINT = %r{^/-/(liveness|readiness|health|metrics)/?$}.freeze
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FEATURE_CATEGORY_DEFAULT = ::Gitlab::FeatureCategories::FEATURE_CATEGORY_DEFAULT
ENDPOINT_MISSING = 'unknown'
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# These were the top 5 categories at a point in time, chosen as a
# reasonable default. If we initialize every category we'll end up
# with an explosion in unused metric combinations, but we want the
# most common ones to be always present.
FEATURE_CATEGORIES_TO_INITIALIZE = ['authentication_and_authorization',
'code_review', 'continuous_integration',
'not_owned', 'source_code_management',
FEATURE_CATEGORY_DEFAULT].freeze
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def initialize(app)
@app = app
end
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def self.http_requests_total
::Gitlab::Metrics.counter(:http_requests_total, 'Request count')
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end
def self.rack_uncaught_errors_count
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::Gitlab::Metrics.counter(:rack_uncaught_errors_total, 'Request handling uncaught errors count')
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end
def self.http_request_duration_seconds
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::Gitlab::Metrics.histogram(:http_request_duration_seconds, 'Request handling execution time',
{}, [0.05, 0.1, 0.25, 0.5, 0.7, 1, 2.5, 5, 10, 25])
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end
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def self.http_health_requests_total
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::Gitlab::Metrics.counter(:http_health_requests_total, 'Health endpoint request count')
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end
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def self.initialize_metrics
# This initialization is done to avoid gaps in scraped metrics after
# restarts. It makes sure all counters/histograms are available at
# process start.
#
# For example `rate(http_requests_total{status="500"}[1m])` would return
# no data until the first 500 error would occur.
HTTP_METHODS.each do |method, statuses|
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http_request_duration_seconds.get({ method: method })
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statuses.product(FEATURE_CATEGORIES_TO_INITIALIZE) do |status, feature_category|
http_requests_total.get({ method: method, status: status, feature_category: feature_category })
end
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end
end
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def call(env)
method = env['REQUEST_METHOD'].downcase
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method = 'INVALID' unless HTTP_METHODS.key?(method)
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started = ::Gitlab::Metrics::System.monotonic_time
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health_endpoint = health_endpoint?(env['PATH_INFO'])
status = 'undefined'
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begin
status, headers, body = @app.call(env)
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elapsed = ::Gitlab::Metrics::System.monotonic_time - started
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if !health_endpoint && ::Gitlab::Metrics.record_duration_for_status?(status)
self.class.http_request_duration_seconds.observe({ method: method }, elapsed)
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record_apdex(env, elapsed)
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end
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[status, headers, body]
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rescue StandardError
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self.class.rack_uncaught_errors_count.increment
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raise
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ensure
if health_endpoint
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self.class.http_health_requests_total.increment(status: status.to_s, method: method)
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else
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self.class.http_requests_total.increment(
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status: status.to_s,
method: method,
feature_category: feature_category.presence || FEATURE_CATEGORY_DEFAULT
)
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end
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end
end
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def health_endpoint?(path)
return false if path.blank?
HEALTH_ENDPOINT.match?(CGI.unescape(path))
end
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def feature_category
::Gitlab::ApplicationContext.current_context_attribute(:feature_category)
end
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def endpoint_id
::Gitlab::ApplicationContext.current_context_attribute(:caller_id)
end
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def record_apdex(env, elapsed)
urgency = urgency_for_env(env)
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Gitlab::Metrics::RailsSlis.request_apdex.increment(
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labels: labels_from_context.merge(request_urgency: urgency.name),
success: elapsed < urgency.duration
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)
end
def labels_from_context
{
feature_category: feature_category.presence || FEATURE_CATEGORY_DEFAULT,
endpoint_id: endpoint_id.presence || ENDPOINT_MISSING
}
end
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def urgency_for_env(env)
endpoint_urgency =
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if env['api.endpoint'].present?
env['api.endpoint'].options[:for].try(:urgency_for_app, env['api.endpoint'])
elsif env['action_controller.instance'].present? && env['action_controller.instance'].respond_to?(:urgency)
env['action_controller.instance'].urgency
end
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endpoint_urgency || Gitlab::EndpointAttributes::DEFAULT_URGENCY
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end
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end
end
end