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prosody/spec/util_cache_spec.lua
Kim Alvefur 915ef3a222 util.cache: Pass cache itself to eviction callback 
Simplifies access to the cache without moving code around a lot given
the currently common pattern of

	local some_cache = cache.new(size, function(k,v) end)
2023-06-30 22:01:55 +02:00

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local cache = require "util.cache";
describe("util.cache", function()
describe("#new()", function()
it("should work", function()
do
local c = cache.new(1);
assert.is_not_nil(c);
assert.has_error(function ()
cache.new(0);
end);
assert.has_error(function ()
cache.new(-1);
end);
assert.has_error(function ()
cache.new("foo");
end);
end
local c = cache.new(5);
local function expect_kv(key, value, actual_key, actual_value)
assert.are.equal(key, actual_key, "key incorrect");
assert.are.equal(value, actual_value, "value incorrect");
end
expect_kv(nil, nil, c:head());
expect_kv(nil, nil, c:tail());
assert.are.equal(c:count(), 0);
c:set("one", 1)
assert.are.equal(c:count(), 1);
expect_kv("one", 1, c:head());
expect_kv("one", 1, c:tail());
c:set("two", 2)
expect_kv("two", 2, c:head());
expect_kv("one", 1, c:tail());
c:set("three", 3)
expect_kv("three", 3, c:head());
expect_kv("one", 1, c:tail());
c:set("four", 4)
c:set("five", 5);
assert.are.equal(c:count(), 5);
expect_kv("five", 5, c:head());
expect_kv("one", 1, c:tail());
c:set("foo", nil);
assert.are.equal(c:count(), 5);
expect_kv("five", 5, c:head());
expect_kv("one", 1, c:tail());
assert.are.equal(c:get("one"), 1);
expect_kv("five", 5, c:head());
expect_kv("one", 1, c:tail());
assert.are.equal(c:get("two"), 2);
assert.are.equal(c:get("three"), 3);
assert.are.equal(c:get("four"), 4);
assert.are.equal(c:get("five"), 5);
assert.are.equal(c:get("foo"), nil);
assert.are.equal(c:get("bar"), nil);
c:set("six", 6);
assert.are.equal(c:count(), 5);
expect_kv("six", 6, c:head());
expect_kv("two", 2, c:tail());
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), 2);
assert.are.equal(c:get("three"), 3);
assert.are.equal(c:get("four"), 4);
assert.are.equal(c:get("five"), 5);
assert.are.equal(c:get("six"), 6);
c:set("three", nil);
assert.are.equal(c:count(), 4);
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), 2);
assert.are.equal(c:get("three"), nil);
assert.are.equal(c:get("four"), 4);
assert.are.equal(c:get("five"), 5);
assert.are.equal(c:get("six"), 6);
c:set("seven", 7);
assert.are.equal(c:count(), 5);
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), 2);
assert.are.equal(c:get("three"), nil);
assert.are.equal(c:get("four"), 4);
assert.are.equal(c:get("five"), 5);
assert.are.equal(c:get("six"), 6);
assert.are.equal(c:get("seven"), 7);
c:set("eight", 8);
assert.are.equal(c:count(), 5);
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), nil);
assert.are.equal(c:get("three"), nil);
assert.are.equal(c:get("four"), 4);
assert.are.equal(c:get("five"), 5);
assert.are.equal(c:get("six"), 6);
assert.are.equal(c:get("seven"), 7);
assert.are.equal(c:get("eight"), 8);
c:set("four", 4);
assert.are.equal(c:count(), 5);
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), nil);
assert.are.equal(c:get("three"), nil);
assert.are.equal(c:get("four"), 4);
assert.are.equal(c:get("five"), 5);
assert.are.equal(c:get("six"), 6);
assert.are.equal(c:get("seven"), 7);
assert.are.equal(c:get("eight"), 8);
c:set("nine", 9);
assert.are.equal(c:count(), 5);
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), nil);
assert.are.equal(c:get("three"), nil);
assert.are.equal(c:get("four"), 4);
assert.are.equal(c:get("five"), nil);
assert.are.equal(c:get("six"), 6);
assert.are.equal(c:get("seven"), 7);
assert.are.equal(c:get("eight"), 8);
assert.are.equal(c:get("nine"), 9);
do
local keys = { "nine", "four", "eight", "seven", "six" };
local values = { 9, 4, 8, 7, 6 };
local i = 0;
for k, v in c:items() do
i = i + 1;
assert.are.equal(k, keys[i]);
assert.are.equal(v, values[i]);
end
assert.are.equal(i, 5);
c:set("four", "2+2");
assert.are.equal(c:count(), 5);
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), nil);
assert.are.equal(c:get("three"), nil);
assert.are.equal(c:get("four"), "2+2");
assert.are.equal(c:get("five"), nil);
assert.are.equal(c:get("six"), 6);
assert.are.equal(c:get("seven"), 7);
assert.are.equal(c:get("eight"), 8);
assert.are.equal(c:get("nine"), 9);
end
do
local keys = { "four", "nine", "eight", "seven", "six" };
local values = { "2+2", 9, 8, 7, 6 };
local i = 0;
for k, v in c:items() do
i = i + 1;
assert.are.equal(k, keys[i]);
assert.are.equal(v, values[i]);
end
assert.are.equal(i, 5);
c:set("foo", nil);
assert.are.equal(c:count(), 5);
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), nil);
assert.are.equal(c:get("three"), nil);
assert.are.equal(c:get("four"), "2+2");
assert.are.equal(c:get("five"), nil);
assert.are.equal(c:get("six"), 6);
assert.are.equal(c:get("seven"), 7);
assert.are.equal(c:get("eight"), 8);
assert.are.equal(c:get("nine"), 9);
end
do
local keys = { "four", "nine", "eight", "seven", "six" };
local values = { "2+2", 9, 8, 7, 6 };
local i = 0;
for k, v in c:items() do
i = i + 1;
assert.are.equal(k, keys[i]);
assert.are.equal(v, values[i]);
end
assert.are.equal(i, 5);
c:set("four", nil);
assert.are.equal(c:get("one"), nil);
assert.are.equal(c:get("two"), nil);
assert.are.equal(c:get("three"), nil);
assert.are.equal(c:get("four"), nil);
assert.are.equal(c:get("five"), nil);
assert.are.equal(c:get("six"), 6);
assert.are.equal(c:get("seven"), 7);
assert.are.equal(c:get("eight"), 8);
assert.are.equal(c:get("nine"), 9);
end
do
local keys = { "nine", "eight", "seven", "six" };
local values = { 9, 8, 7, 6 };
local i = 0;
for k, v in c:items() do
i = i + 1;
assert.are.equal(k, keys[i]);
assert.are.equal(v, values[i]);
end
assert.are.equal(i, 4);
end
do
local evicted_key, evicted_value;
local c2 = cache.new(3, function (_key, _value)
evicted_key, evicted_value = _key, _value;
end);
local function set(k, v, should_evict_key, should_evict_value)
evicted_key, evicted_value = nil, nil;
c2:set(k, v);
assert.are.equal(evicted_key, should_evict_key);
assert.are.equal(evicted_value, should_evict_value);
end
set("a", 1)
set("a", 1)
set("a", 1)
set("a", 1)
set("a", 1)
set("b", 2)
set("c", 3)
set("b", 2)
set("d", 4, "a", 1)
set("e", 5, "c", 3)
end
do
local evicted_key, evicted_value;
local c3 = cache.new(1, function (_key, _value)
evicted_key, evicted_value = _key, _value;
if _key == "a" then
-- Sanity check for what we're evicting
assert.are.equal(_key, "a");
assert.are.equal(_value, 1);
-- We're going to block eviction of this key/value, so set to nil...
evicted_key, evicted_value = nil, nil;
-- Returning false to block eviction
return false
end
end);
local function set(k, v, should_evict_key, should_evict_value)
evicted_key, evicted_value = nil, nil;
local ret = c3:set(k, v);
assert.are.equal(evicted_key, should_evict_key);
assert.are.equal(evicted_value, should_evict_value);
return ret;
end
set("a", 1)
set("a", 1)
set("a", 1)
set("a", 1)
set("a", 1)
-- Our on_evict prevents "a" from being evicted, causing this to fail...
assert.are.equal(set("b", 2), false, "Failed to prevent eviction, or signal result");
expect_kv("a", 1, c3:head());
expect_kv("a", 1, c3:tail());
-- Check the final state is what we expect
assert.are.equal(c3:get("a"), 1);
assert.are.equal(c3:get("b"), nil);
assert.are.equal(c3:count(), 1);
end
local c4 = cache.new(3, false);
assert.are.equal(c4:set("a", 1), true);
assert.are.equal(c4:set("a", 1), true);
assert.are.equal(c4:set("a", 1), true);
assert.are.equal(c4:set("a", 1), true);
assert.are.equal(c4:set("b", 2), true);
assert.are.equal(c4:set("c", 3), true);
assert.are.equal(c4:set("d", 4), false);
assert.are.equal(c4:set("d", 4), false);
assert.are.equal(c4:set("d", 4), false);
expect_kv("c", 3, c4:head());
expect_kv("a", 1, c4:tail());
local c5 = cache.new(3, function (k, v) --luacheck: ignore 212/v
if k == "a" then
return nil;
elseif k == "b" then
return true;
end
return false;
end);
assert.are.equal(c5:set("a", 1), true);
assert.are.equal(c5:set("a", 1), true);
assert.are.equal(c5:set("a", 1), true);
assert.are.equal(c5:set("a", 1), true);
assert.are.equal(c5:set("b", 2), true);
assert.are.equal(c5:set("c", 3), true);
assert.are.equal(c5:set("d", 4), true); -- "a" evicted (cb returned nil)
assert.are.equal(c5:set("d", 4), true); -- nop
assert.are.equal(c5:set("d", 4), true); -- nop
assert.are.equal(c5:set("e", 5), true); -- "b" evicted (cb returned true)
assert.are.equal(c5:set("f", 6), false); -- "c" won't evict (cb returned false)
expect_kv("e", 5, c5:head());
expect_kv("c", 3, c5:tail());
end);
it(":table works", function ()
local t = cache.new(3):table();
assert.is.table(t);
t["a"] = "1";
assert.are.equal(t["a"], "1");
t["b"] = "2";
assert.are.equal(t["b"], "2");
t["c"] = "3";
assert.are.equal(t["c"], "3");
t["d"] = "4";
assert.are.equal(t["d"], "4");
assert.are.equal(t["a"], nil);
local i = spy.new(function () end);
for k, v in pairs(t) do
i(k,v)
end
assert.spy(i).was_called();
assert.spy(i).was_called_with("b", "2");
assert.spy(i).was_called_with("c", "3");
assert.spy(i).was_called_with("d", "4");
end);
local function vs(t)
local vs_ = {};
for v in t:values() do
vs_[#vs_+1] = v;
end
return vs_;
end
it(":values works", function ()
local t = cache.new(3);
t:set("k1", "v1");
t:set("k2", "v2");
assert.same({"v2", "v1"}, vs(t));
t:set("k3", "v3");
assert.same({"v3", "v2", "v1"}, vs(t));
t:set("k4", "v4");
assert.same({"v4", "v3", "v2"}, vs(t));
end);
it(":resize works", function ()
local c = cache.new(5);
for i = 1, 5 do
c:set(("k%d"):format(i), ("v%d"):format(i));
end
assert.same({"v5", "v4", "v3", "v2", "v1"}, vs(c));
assert.has_error(function ()
c:resize(-1);
end);
assert.has_error(function ()
c:resize(0);
end);
assert.has_error(function ()
c:resize("foo");
end);
c:resize(3);
assert.same({"v5", "v4", "v3"}, vs(c));
end);
it("eviction stuff", function ()
local c = cache.new(4, function(_k,_v,c)
if c.size < 10 then
c:resize(c.size*2);
end
end)
for i = 1,20 do
c:set(i,i)
end
assert.equal(16, c.size);
assert.is_nil(c:get(1))
assert.is_nil(c:get(4))
assert.equal(5, c:get(5))
assert.equal(20, c:get(20))
c:resize(4)
assert.equal(20, c:get(20))
assert.equal(17, c:get(17))
assert.is_nil(c:get(10))
end)
end);
end);
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