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Include endpoint in metrics for ETag caching middleware

This commit is contained in:
Adam Niedzielski 2017-04-06 14:46:55 +02:00
parent 49bdd8d63b
commit 894f01cd05
3 changed files with 40 additions and 24 deletions
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4
changelogs/unreleased/add-dimension-etag-caching-metrics.yml Normal file
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@ -0,0 +1,4 @@
---
title: Include endpoint in metrics for ETag caching middleware
merge_request: 10495
author:

44
lib/gitlab/etag_caching/middleware.rb
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@ -2,26 +2,34 @@ module Gitlab
module EtagCaching
class Middleware
RESERVED_WORDS = NamespaceValidator::WILDCARD_ROUTES.map { |word| "/#{word}/" }.join('|')
ROUTE_REGEXP = Regexp.union(
%r(^(?!.*(#{RESERVED_WORDS})).*/noteable/issue/\d+/notes\z),
%r(^(?!.*(#{RESERVED_WORDS})).*/issues/\d+/rendered_title\z)
)
ROUTES = [
{
regexp: %r(^(?!.*(#{RESERVED_WORDS})).*/noteable/issue/\d+/notes\z),
name: 'issue_notes'
},
{
regexp: %r(^(?!.*(#{RESERVED_WORDS})).*/issues/\d+/rendered_title\z),
name: 'issue_title'
}
].freeze
def initialize(app)
@app = app
end
def call(env)
return @app.call(env) unless enabled_for_current_route?(env)
Gitlab::Metrics.add_event(:etag_caching_middleware_used)
route = match_current_route(env)
return @app.call(env) unless route
track_event(:etag_caching_middleware_used, route)
etag, cached_value_present = get_etag(env)
if_none_match = env['HTTP_IF_NONE_MATCH']
if if_none_match == etag
handle_cache_hit(etag)
handle_cache_hit(etag, route)
else
track_cache_miss(if_none_match, cached_value_present)
track_cache_miss(if_none_match, cached_value_present, route)
status, headers, body = @app.call(env)
headers['ETag'] = etag
@ -31,8 +39,8 @@ module Gitlab
private
def enabled_for_current_route?(env)
ROUTE_REGEXP.match(env['PATH_INFO'])
def match_current_route(env)
ROUTES.find { |route| route[:regexp].match(env['PATH_INFO']) }
end
def get_etag(env)
@ -52,23 +60,27 @@ module Gitlab
%Q{W/"#{value}"}
end
def handle_cache_hit(etag)
Gitlab::Metrics.add_event(:etag_caching_cache_hit)
def handle_cache_hit(etag, route)
track_event(:etag_caching_cache_hit, route)
status_code = Gitlab::PollingInterval.polling_enabled? ? 304 : 429
[status_code, { 'ETag' => etag }, ['']]
end
def track_cache_miss(if_none_match, cached_value_present)
def track_cache_miss(if_none_match, cached_value_present, route)
if if_none_match.blank?
Gitlab::Metrics.add_event(:etag_caching_header_missing)
track_event(:etag_caching_header_missing, route)
elsif !cached_value_present
Gitlab::Metrics.add_event(:etag_caching_key_not_found)
track_event(:etag_caching_key_not_found, route)
else
Gitlab::Metrics.add_event(:etag_caching_resource_changed)
track_event(:etag_caching_resource_changed, route)
end
end
def track_event(name, route)
Gitlab::Metrics.add_event(name, endpoint: route[:name])
end
end
end
end

16
spec/lib/gitlab/etag_caching/middleware_spec.rb
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@ -47,9 +47,9 @@ describe Gitlab::EtagCaching::Middleware do
it 'tracks "etag_caching_key_not_found" event' do
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_middleware_used)
.with(:etag_caching_middleware_used, endpoint: 'issue_notes')
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_key_not_found)
.with(:etag_caching_key_not_found, endpoint: 'issue_notes')
middleware.call(build_env(path, if_none_match))
end
@ -93,9 +93,9 @@ describe Gitlab::EtagCaching::Middleware do
it 'tracks "etag_caching_cache_hit" event' do
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_middleware_used)
.with(:etag_caching_middleware_used, endpoint: 'issue_notes')
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_cache_hit)
.with(:etag_caching_cache_hit, endpoint: 'issue_notes')
middleware.call(build_env(path, if_none_match))
end
@ -132,9 +132,9 @@ describe Gitlab::EtagCaching::Middleware do
mock_app_response
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_middleware_used)
.with(:etag_caching_middleware_used, endpoint: 'issue_notes')
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_resource_changed)
.with(:etag_caching_resource_changed, endpoint: 'issue_notes')
middleware.call(build_env(path, if_none_match))
end
@ -150,9 +150,9 @@ describe Gitlab::EtagCaching::Middleware do
it 'tracks "etag_caching_header_missing" event' do
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_middleware_used)
.with(:etag_caching_middleware_used, endpoint: 'issue_notes')
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_header_missing)
.with(:etag_caching_header_missing, endpoint: 'issue_notes')
middleware.call(build_env(path, if_none_match))
end