discourse/spec/lib/rate_limiter_spec.rb

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# frozen_string_literal: true
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require "rate_limiter"
RSpec.describe RateLimiter do
fab!(:user)
fab!(:admin)
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let(:rate_limiter) { RateLimiter.new(user, "peppermint-butler", 2, 60) }
let(:apply_staff_rate_limiter) do
RateLimiter.new(admin, "peppermint-servant", 5, 40, apply_limit_to_staff: true)
end
let(:staff_rate_limiter) do
RateLimiter.new(user, "peppermind-servant", 5, 40, staff_limit: { max: 10, secs: 80 })
end
let(:admin_staff_rate_limiter) do
RateLimiter.new(admin, "peppermind-servant", 5, 40, staff_limit: { max: 10, secs: 80 })
end
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describe "disabled" do
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before do
rate_limiter.performed!
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rate_limiter.performed!
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end
it "should be disabled" do
expect(RateLimiter.disabled?).to eq(true)
end
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it "returns true for can_perform?" do
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expect(rate_limiter.can_perform?).to eq(true)
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end
it "doesn't raise an error on performed!" do
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expect { rate_limiter.performed! }.not_to raise_error
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end
end
describe "enabled" do
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before do
RateLimiter.enable
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rate_limiter.clear!
staff_rate_limiter.clear!
admin_staff_rate_limiter.clear!
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end
context "with aggressive rate limiter" do
it "can operate correctly and totally stop limiting" do
freeze_time
# 2 requests every 30 seconds
limiter = RateLimiter.new(nil, "test", 2, 30, global: true, aggressive: true)
limiter.clear!
limiter.performed!
limiter.performed!
freeze_time 29.seconds.from_now
expect do limiter.performed! end.to raise_error(RateLimiter::LimitExceeded)
expect do limiter.performed! end.to raise_error(RateLimiter::LimitExceeded)
# in aggressive mode both these ^^^ count as an attempt
freeze_time 29.seconds.from_now
expect do limiter.performed! end.to raise_error(RateLimiter::LimitExceeded)
expect do limiter.performed! end.to raise_error(RateLimiter::LimitExceeded)
freeze_time 30.seconds.from_now
expect { limiter.performed! }.not_to raise_error
expect { limiter.performed! }.not_to raise_error
end
end
context "with global rate limiter" do
it "can operate in global mode" do
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limiter = RateLimiter.new(nil, "test", 2, 30, global: true)
limiter.clear!
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thrown = false
limiter.performed!
limiter.performed!
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begin
limiter.performed!
rescue RateLimiter::LimitExceeded => e
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expect(Integer === e.available_in).to eq(true)
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expect(e.available_in).to be > 28
expect(e.available_in).to be < 32
thrown = true
end
expect(thrown).to be(true)
end
end
context "when handling readonly" do
before do
# random IP address in the ULA range that does not exist
Discourse.redis.without_namespace.slaveof "fdec:3f5d:d0b7:4c4b:472b:636a:4370:7ac5", "49999"
end
after { Discourse.redis.without_namespace.slaveof "no", "one" }
it "does not explode" do
expect { rate_limiter.performed! }.not_to raise_error
end
end
context "when never done" do
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it "should perform right away" do
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expect(rate_limiter.can_perform?).to eq(true)
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end
it "performs without an error" do
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expect { rate_limiter.performed! }.not_to raise_error
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end
end
context "when remaining" do
it "updates correctly" do
expect(rate_limiter.remaining).to eq(2)
rate_limiter.performed!
expect(rate_limiter.remaining).to eq(1)
rate_limiter.performed!
expect(rate_limiter.remaining).to eq(0)
end
end
context "when max is less than or equal to zero" do
it "should raise the right error" do
[-1, 0, nil].each do |max|
expect do RateLimiter.new(user, "a", max, 60).performed! end.to raise_error(
RateLimiter::LimitExceeded,
)
end
end
end
context "with multiple calls" do
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before do
freeze_time
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rate_limiter.performed!
rate_limiter.performed!
end
it "returns false for can_perform when the limit has been hit" do
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expect(rate_limiter.can_perform?).to eq(false)
expect(rate_limiter.remaining).to eq(0)
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end
it "raises an error the third time called" do
expect { rate_limiter.performed! }.to raise_error do |error|
expect(error).to be_a(RateLimiter::LimitExceeded)
expect(error).to having_attributes(available_in: 60)
end
end
it "raises no error when the sliding window ended" do
freeze_time 60.seconds.from_now
expect { rate_limiter.performed! }.not_to raise_error
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end
context "as an admin/moderator" do
it "returns true for can_perform if the user is an admin" do
user.admin = true
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expect(rate_limiter.can_perform?).to eq(true)
expect(rate_limiter.remaining).to eq(2)
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end
it "doesn't raise an error when an admin performs the task" do
user.admin = true
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expect { rate_limiter.performed! }.not_to raise_error
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end
it "returns true for can_perform if the user is a mod" do
user.moderator = true
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expect(rate_limiter.can_perform?).to eq(true)
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end
it "doesn't raise an error when a moderator performs the task" do
user.moderator = true
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expect { rate_limiter.performed! }.not_to raise_error
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end
it "applies max / secs to staff when apply_limit_to_staff flag is true" do
5.times { apply_staff_rate_limiter.performed! }
freeze_time 10.seconds.from_now
expect { apply_staff_rate_limiter.performed! }.to raise_error do |error|
expect(error).to be_a(RateLimiter::LimitExceeded)
expect(error).to having_attributes(available_in: 30)
end
end
it "applies staff_limit max when present for staff" do
expect(admin_staff_rate_limiter.can_perform?).to eq(true)
expect(admin_staff_rate_limiter.remaining).to eq(10)
end
it "applies staff_limit secs when present for staff" do
10.times { admin_staff_rate_limiter.performed! }
freeze_time 10.seconds.from_now
expect { admin_staff_rate_limiter.performed! }.to raise_error do |error|
expect(error).to be_a(RateLimiter::LimitExceeded)
expect(error).to having_attributes(available_in: 70)
end
end
it "applies standard max to non-staff users when staff_limit values are present" do
expect(staff_rate_limiter.can_perform?).to eq(true)
expect(staff_rate_limiter.remaining).to eq(5)
end
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end
describe "#rollback!" do
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before { rate_limiter.rollback! }
it "returns true for can_perform since there is now room" do
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expect(rate_limiter.can_perform?).to eq(true)
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end
it "raises no error now that there is room" do
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expect { rate_limiter.performed! }.not_to raise_error
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end
end
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end
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end
end