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require 'spec_helper'
RSpec.describe Jaeger::RateLimiter do
let(:start_time) { Time.now }
before { Timecop.freeze(start_time) }
after { Timecop.return }
describe '#check_credit' do
it 'returns false if item cost is higher than balance' do
limiter = build_limiter(credits_per_second: 5)
expect(limiter.check_credit(6)).to eq(false)
end
it 'returns true until there is credit left' do
limiter = build_limiter(credits_per_second: 2)
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(false)
end
it 'returns true when there is enough credit' do
limiter = build_limiter(credits_per_second: 2)
# use all credit
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(false)
# move time 250ms forward, not enough credits to pay for one sample
Timecop.travel(start_time + 0.25)
expect(limiter.check_credit(1.0)).to eq(false)
# move time 250ms forward, now enough credits to pay for one sample
Timecop.travel(start_time + 0.5)
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(false)
# move time 5s forward, enough to accumulate credits for 10 samples,
# but it should still be capped at 2
Timecop.travel(start_time + 5.5)
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(false)
end
end
describe '#update' do
context 'when balance was full before the update' do
it 'keeps the new balance full' do
limiter = build_limiter(credits_per_second: 1)
expect(limiter.check_credit(1.0)).to eq(true)
limiter.update(credits_per_second: 2, max_balance: 2)
expect(limiter.check_credit(1.0)).to eq(false)
end
end
context 'when balance was half full before the update' do
it 'marks the new balance half full' do
limiter = build_limiter(credits_per_second: 2)
expect(limiter.check_credit(1.0)).to eq(true)
limiter.update(credits_per_second: 4, max_balance: 4)
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(true)
expect(limiter.check_credit(1.0)).to eq(false)
end
end
end
def build_limiter(credits_per_second:, **opts)
described_class.new(**{
credits_per_second: credits_per_second,
max_balance: credits_per_second
}.merge(opts))
end
end
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