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09-balancer_spec.lua
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09-balancer_spec.lua
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local utils = require "kong.tools.utils"
local mocker = require "spec.fixtures.mocker"
local ws_id = utils.uuid()
local function setup_it_block(consistency)
local cache_table = {}
local function mock_cache(cache_table, limit)
return {
safe_set = function(self, k, v)
if limit then
local n = 0
for _, _ in pairs(cache_table) do
n = n + 1
end
if n >= limit then
return nil, "no memory"
end
end
cache_table[k] = v
return true
end,
get = function(self, k, _, fn, arg)
if cache_table[k] == nil then
cache_table[k] = fn(arg)
end
return cache_table[k]
end,
}
end
mocker.setup(finally, {
kong = {
configuration = {
worker_consistency = consistency,
worker_state_update_frequency = 0.1,
},
core_cache = mock_cache(cache_table),
},
ngx = {
ctx = {
workspace = ws_id,
}
}
})
end
for _, consistency in ipairs({"strict", "eventual"}) do
describe("Balancer (worker_consistency = " .. consistency .. ")", function()
local singletons, balancer
local UPSTREAMS_FIXTURES
local TARGETS_FIXTURES
local upstream_hc
local upstream_ph
lazy_teardown(function()
ngx.log:revert() -- luacheck: ignore
end)
lazy_setup(function()
stub(ngx, "log")
balancer = require "kong.runloop.balancer"
singletons = require "kong.singletons"
singletons.worker_events = require "resty.worker.events"
singletons.db = {}
singletons.worker_events.configure({
shm = "kong_process_events", -- defined by "lua_shared_dict"
timeout = 5, -- life time of event data in shm
interval = 1, -- poll interval (seconds)
wait_interval = 0.010, -- wait before retry fetching event data
wait_max = 0.5, -- max wait time before discarding event
})
local hc_defaults = {
active = {
timeout = 1,
concurrency = 10,
http_path = "/",
healthy = {
interval = 0, -- 0 = probing disabled by default
http_statuses = { 200, 302 },
successes = 0, -- 0 = disabled by default
},
unhealthy = {
interval = 0, -- 0 = probing disabled by default
http_statuses = { 429, 404,
500, 501, 502, 503, 504, 505 },
tcp_failures = 0, -- 0 = disabled by default
timeouts = 0, -- 0 = disabled by default
http_failures = 0, -- 0 = disabled by default
},
},
passive = {
healthy = {
http_statuses = { 200, 201, 202, 203, 204, 205, 206, 207, 208, 226,
300, 301, 302, 303, 304, 305, 306, 307, 308 },
successes = 0,
},
unhealthy = {
http_statuses = { 429, 500, 503 },
tcp_failures = 0, -- 0 = circuit-breaker disabled by default
timeouts = 0, -- 0 = circuit-breaker disabled by default
http_failures = 0, -- 0 = circuit-breaker disabled by default
},
},
}
local passive_hc = utils.deep_copy(hc_defaults)
passive_hc.passive.healthy.successes = 1
passive_hc.passive.unhealthy.http_failures = 1
UPSTREAMS_FIXTURES = {
[1] = { id = "a", ws_id = ws_id, name = "mashape", slots = 10, healthchecks = hc_defaults, algorithm = "round-robin" },
[2] = { id = "b", ws_id = ws_id, name = "kong", slots = 10, healthchecks = hc_defaults, algorithm = "round-robin" },
[3] = { id = "c", ws_id = ws_id, name = "gelato", slots = 20, healthchecks = hc_defaults, algorithm = "round-robin" },
[4] = { id = "d", ws_id = ws_id, name = "galileo", slots = 20, healthchecks = hc_defaults, algorithm = "round-robin" },
[5] = { id = "e", ws_id = ws_id, name = "upstream_e", slots = 10, healthchecks = hc_defaults, algorithm = "round-robin" },
[6] = { id = "f", ws_id = ws_id, name = "upstream_f", slots = 10, healthchecks = hc_defaults, algorithm = "round-robin" },
[7] = { id = "hc_" .. consistency, ws_id = ws_id, name = "upstream_hc_" .. consistency, slots = 10, healthchecks = passive_hc, algorithm = "round-robin" },
[8] = { id = "ph", ws_id = ws_id, name = "upstream_ph", slots = 10, healthchecks = passive_hc, algorithm = "round-robin" },
[9] = { id = "otes", ws_id = ws_id, name = "upstream_otes", slots = 10, healthchecks = hc_defaults, algorithm = "round-robin" },
[10] = { id = "otee", ws_id = ws_id, name = "upstream_otee", slots = 10, healthchecks = hc_defaults, algorithm = "round-robin" },
}
upstream_hc = UPSTREAMS_FIXTURES[7]
upstream_ph = UPSTREAMS_FIXTURES[8]
TARGETS_FIXTURES = {
-- 1st upstream; a
{
id = "a1",
ws_id = ws_id,
created_at = "003",
upstream = { id = "a", ws_id = ws_id },
target = "localhost:80",
weight = 10,
},
{
id = "a2",
ws_id = ws_id,
created_at = "002",
upstream = { id = "a", ws_id = ws_id },
target = "localhost:80",
weight = 10,
},
{
id = "a3",
ws_id = ws_id,
created_at = "001",
upstream = { id = "a", ws_id = ws_id },
target = "localhost:80",
weight = 10,
},
{
id = "a4",
ws_id = ws_id,
created_at = "002", -- same timestamp as "a2"
upstream = { id = "a", ws_id = ws_id },
target = "localhost:80",
weight = 10,
},
-- 2nd upstream; b
{
id = "b1",
ws_id = ws_id,
created_at = "003",
upstream = { id = "b", ws_id = ws_id },
target = "localhost:80",
weight = 10,
},
-- 3rd upstream: e (removed and re-added)
{
id = "e1",
ws_id = ws_id,
created_at = "001",
upstream = { id = "e", ws_id = ws_id },
target = "127.0.0.1:2112",
weight = 10,
},
{
id = "e2",
ws_id = ws_id,
created_at = "002",
upstream = { id = "e", ws_id = ws_id },
target = "127.0.0.1:2112",
weight = 0,
},
{
id = "e3",
ws_id = ws_id,
created_at = "003",
upstream = { id = "e", ws_id = ws_id },
target = "127.0.0.1:2112",
weight = 10,
},
-- 4th upstream: f (removed and not re-added)
{
id = "f1",
ws_id = ws_id,
created_at = "001",
upstream = { id = "f", ws_id = ws_id },
target = "127.0.0.1:5150",
weight = 10,
},
{
id = "f2",
ws_id = ws_id,
created_at = "002",
upstream = { id = "f", ws_id = ws_id },
target = "127.0.0.1:5150",
weight = 0,
},
{
id = "f3",
ws_id = ws_id,
created_at = "003",
upstream = { id = "f", ws_id = ws_id },
target = "127.0.0.1:2112",
weight = 10,
},
-- upstream_hc
{
id = "hc1" .. consistency,
ws_id = ws_id,
created_at = "001",
upstream = { id = "hc_" .. consistency, ws_id = ws_id },
target = "localhost:1111",
weight = 10,
},
-- upstream_ph
{
id = "ph1",
ws_id = ws_id,
created_at = "001",
upstream = { id = "ph", ws_id = ws_id },
target = "localhost:1111",
weight = 10,
},
{
id = "ph2",
ws_id = ws_id,
created_at = "001",
upstream = { id = "ph", ws_id = ws_id },
target = "127.0.0.1:2222",
weight = 10,
},
-- upstream_otes
{
id = "otes1",
ws_id = ws_id,
created_at = "001",
upstream = { id = "otes", ws_id = ws_id },
target = "localhost:1111",
weight = 10,
},
-- upstream_otee
{
id = "otee1",
ws_id = ws_id,
created_at = "001",
upstream = { id = "otee", ws_id = ws_id },
target = "localhost:1111",
weight = 10,
},
}
local function each(fixture)
return function()
local i = 0
return function(self)
i = i + 1
return fixture[i]
end
end
end
local function select(fixture)
return function(self, pk)
for item in self:each() do
if item.id == pk.id then
return item
end
end
end
end
singletons.db = {
targets = {
each = each(TARGETS_FIXTURES),
select_by_upstream_raw = function(self, upstream_pk)
local upstream_id = upstream_pk.id
local res, len = {}, 0
for tgt in self:each() do
if tgt.upstream.id == upstream_id then
tgt.order = string.format("%d:%s", tgt.created_at * 1000, tgt.id)
len = len + 1
res[len] = tgt
end
end
table.sort(res, function(a, b) return a.order < b.order end)
return res
end
},
upstreams = {
each = each(UPSTREAMS_FIXTURES),
select = select(UPSTREAMS_FIXTURES),
},
}
singletons.core_cache = {
_cache = {},
get = function(self, key, _, loader, arg)
local v = self._cache[key]
if v == nil then
v = loader(arg)
self._cache[key] = v
end
return v
end,
invalidate_local = function(self, key)
self._cache[key] = nil
end
}
end)
describe("create_balancer()", function()
local dns_client = require("resty.dns.client")
dns_client.init()
it("creates a balancer with a healthchecker", function()
setup_it_block(consistency)
local my_balancer = assert(balancer._create_balancer(UPSTREAMS_FIXTURES[1]))
local hc = assert(balancer._get_healthchecker(my_balancer))
hc:stop()
end)
it("reuses a balancer by default", function()
local b1 = assert(balancer._create_balancer(UPSTREAMS_FIXTURES[1]))
local hc1 = balancer._get_healthchecker(b1)
local b2 = balancer._create_balancer(UPSTREAMS_FIXTURES[1])
assert.equal(b1, b2)
assert(hc1:stop())
end)
it("re-creates a balancer if told to", function()
setup_it_block(consistency)
balancer.init()
local b1 = assert(balancer._create_balancer(UPSTREAMS_FIXTURES[1], true))
local hc1 = balancer._get_healthchecker(b1)
assert(hc1:stop())
local b2 = assert(balancer._create_balancer(UPSTREAMS_FIXTURES[1], true))
local hc2 = balancer._get_healthchecker(b2)
assert(hc2:stop())
assert.not_same(b1, b2)
end)
end)
describe("get_balancer()", function()
local dns_client = require("resty.dns.client")
dns_client.init()
it("balancer and healthchecker match; remove and re-add", function()
setup_it_block(consistency)
local my_balancer = assert(balancer._get_balancer({
host = "upstream_e"
}, true))
local hc = assert(balancer._get_healthchecker(my_balancer))
assert.same(1, #hc.targets)
assert.truthy(hc.targets["127.0.0.1"])
assert.truthy(hc.targets["127.0.0.1"][2112])
end)
it("balancer and healthchecker match; remove and not re-add", function()
setup_it_block(consistency)
local my_balancer = assert(balancer._get_balancer({
host = "upstream_f"
}, true))
local hc = assert(balancer._get_healthchecker(my_balancer))
assert.same(1, #hc.targets)
assert.truthy(hc.targets["127.0.0.1"])
assert.truthy(hc.targets["127.0.0.1"][2112])
end)
end)
describe("load_upstreams_dict_into_memory()", function()
local upstreams_dict
lazy_setup(function()
upstreams_dict = balancer._load_upstreams_dict_into_memory()
end)
it("retrieves all upstreams as a dictionary", function()
assert.is.table(upstreams_dict)
for _, u in ipairs(UPSTREAMS_FIXTURES) do
assert.equal(upstreams_dict[ws_id .. ":" .. u.name], u.id)
upstreams_dict[ws_id .. ":" .. u.name] = nil -- remove each match
end
assert.is_nil(next(upstreams_dict)) -- should be empty now
end)
end)
describe("get_all_upstreams()", function()
it("gets a map of all upstream names to ids", function()
setup_it_block(consistency)
local upstreams_dict = balancer.get_all_upstreams()
local fixture_dict = {}
for _, upstream in ipairs(UPSTREAMS_FIXTURES) do
fixture_dict[ws_id .. ":" .. upstream.name] = upstream.id
end
assert.same(fixture_dict, upstreams_dict)
end)
end)
describe("get_upstream_by_name()", function()
it("retrieves a complete upstream based on its name", function()
setup_it_block(consistency)
for _, fixture in ipairs(UPSTREAMS_FIXTURES) do
local upstream = balancer.get_upstream_by_name(fixture.name)
assert.same(fixture, upstream)
end
end)
end)
describe("load_targets_into_memory()", function()
local targets
local upstream
it("retrieves all targets per upstream, ordered", function()
setup_it_block(consistency)
upstream = "a"
targets = balancer._load_targets_into_memory(upstream)
assert.equal(4, #targets)
assert(targets[1].id == "a3")
assert(targets[2].id == "a2")
assert(targets[3].id == "a4")
assert(targets[4].id == "a1")
end)
end)
describe("post_health()", function()
local hc, my_balancer
lazy_setup(function()
my_balancer = assert(balancer._create_balancer(upstream_ph))
hc = assert(balancer._get_healthchecker(my_balancer))
end)
lazy_teardown(function()
if hc then
hc:stop()
end
end)
it("posts healthy/unhealthy using IP and hostname", function()
setup_it_block(consistency)
local tests = {
{ host = "127.0.0.1", port = 2222, health = true },
{ host = "127.0.0.1", port = 2222, health = false },
{ host = "localhost", port = 1111, health = true },
{ host = "localhost", port = 1111, health = false },
}
for _, t in ipairs(tests) do
assert(balancer.post_health(upstream_ph, t.host, nil, t.port, t.health))
local health_info = assert(balancer.get_upstream_health("ph"))
local response = t.health and "HEALTHY" or "UNHEALTHY"
assert.same(response,
health_info[t.host .. ":" .. t.port].addresses[1].health)
end
end)
it("fails if upstream/balancer doesn't exist", function()
local bad = { name = "invalid", id = "bad" }
local ok, err = balancer.post_health(bad, "127.0.0.1", 1111, true)
assert.falsy(ok)
assert.match(err, "Upstream invalid has no balancer")
end)
end)
describe("healthcheck events", function()
it("(un)subscribe_to_healthcheck_events()", function()
setup_it_block(consistency)
local my_balancer = assert(balancer._create_balancer(upstream_hc))
local hc = assert(balancer._get_healthchecker(my_balancer))
local data = {}
local cb = function(upstream_id, ip, port, hostname, health)
table.insert(data, {
upstream_id = upstream_id,
ip = ip,
port = port,
hostname = hostname,
health = health,
})
end
balancer.subscribe_to_healthcheck_events(cb)
my_balancer.report_http_status({
address = {
ip = "127.0.0.1",
port = 1111,
host = {hostname = "localhost"},
}}, 429)
my_balancer.report_http_status({
address = {
ip = "127.0.0.1",
port = 1111,
host = {hostname = "localhost"},
}}, 200)
balancer.unsubscribe_from_healthcheck_events(cb)
my_balancer.report_http_status({
address = {
ip = "127.0.0.1",
port = 1111,
host = {hostname = "localhost"},
}}, 429)
hc:stop()
assert.same({
upstream_id = "hc_" .. consistency,
ip = "127.0.0.1",
port = 1111,
hostname = "localhost",
health = "unhealthy"
}, data[1])
assert.same({
upstream_id = "hc_" .. consistency,
ip = "127.0.0.1",
port = 1111,
hostname = "localhost",
health = "healthy"
}, data[2])
assert.same(nil, data[3])
end)
end)
end)
end