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# frozen_string_literal: true
require 'spec_helper'
describe Gitlab::Metrics::RedisRackMiddleware do
let(:app) { double(:app) }
let(:middleware) { described_class.new(app) }
let(:env) { {} }
let(:transaction) { Gitlab::Metrics::WebTransaction.new(env) }
before do
allow(app).to receive(:call).with(env).and_return('wub wub')
end
describe '#call' do
let(:counter) { double(Prometheus::Client::Counter, increment: nil) }
let(:histogram) { double(Prometheus::Client::Histogram, observe: nil) }
let(:redis_query_time) { 0.1 }
let(:redis_requests_count) { 2 }
before do
allow(Gitlab::Instrumentation::Redis).to receive(:query_time) { redis_query_time }
allow(Gitlab::Instrumentation::Redis).to receive(:get_request_count) { redis_requests_count }
allow(Gitlab::Metrics).to receive(:counter)
.with(:http_redis_requests_total,
an_instance_of(String),
Gitlab::Metrics::Transaction::BASE_LABELS)
.and_return(counter)
allow(Gitlab::Metrics).to receive(:histogram)
.with(:http_redis_requests_duration_seconds,
an_instance_of(String),
Gitlab::Metrics::Transaction::BASE_LABELS,
Gitlab::Instrumentation::Redis::QUERY_TIME_BUCKETS)
.and_return(histogram)
allow(Gitlab::Metrics).to receive(:current_transaction).and_return(transaction)
end
it 'calls the app' do
expect(middleware.call(env)).to eq('wub wub')
end
it 'records redis metrics' do
expect(counter).to receive(:increment).with(transaction.labels, redis_requests_count)
expect(histogram).to receive(:observe).with(transaction.labels, redis_query_time)
middleware.call(env)
end
it 'records redis metrics if an error is raised' do
expect(counter).to receive(:increment).with(transaction.labels, redis_requests_count)
expect(histogram).to receive(:observe).with(transaction.labels, redis_query_time)
allow(app).to receive(:call).with(env).and_raise(StandardError)
expect { middleware.call(env) }.to raise_error(StandardError)
end
end
end
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