84 lines
3 KiB
Lua
84 lines
3 KiB
Lua
local conf = [===[
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nameserver 1.2.3.4
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nameserver 4.5.6.7
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search ingress-nginx.svc.cluster.local svc.cluster.local cluster.local
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options ndots:5
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]===]
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helpers.with_resolv_conf(conf, function()
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require("util.resolv_conf")
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end)
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describe("resolve", function()
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local dns = require("util.dns")
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it("sets correct nameservers", function()
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helpers.mock_resty_dns_new(function(self, options)
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assert.are.same({ nameservers = { "1.2.3.4", "4.5.6.7" }, retrans = 5, timeout = 2000 }, options)
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return nil, ""
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end)
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dns.resolve("example.com")
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end)
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it("returns host when an error happens", function()
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local s_ngx_log = spy.on(ngx, "log")
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helpers.mock_resty_dns_new(function(...) return nil, "an error" end)
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assert.are.same({ "example.com" }, dns.resolve("example.com"))
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assert.spy(s_ngx_log).was_called_with(ngx.ERR, "failed to instantiate the resolver: an error")
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helpers.mock_resty_dns_query(nil, "oops!")
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assert.are.same({ "example.com" }, dns.resolve("example.com"))
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assert.spy(s_ngx_log).was_called_with(ngx.ERR, "failed to query the DNS server:\noops!\noops!")
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helpers.mock_resty_dns_query({ errcode = 1, errstr = "format error" })
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assert.are.same({ "example.com" }, dns.resolve("example.com"))
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assert.spy(s_ngx_log).was_called_with(ngx.ERR, "failed to query the DNS server:\nserver returned error code: 1: format error\nserver returned error code: 1: format error")
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helpers.mock_resty_dns_query({})
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assert.are.same({ "example.com" }, dns.resolve("example.com"))
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assert.spy(s_ngx_log).was_called_with(ngx.ERR, "failed to query the DNS server:\nno record resolved\nno record resolved")
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helpers.mock_resty_dns_query({ { name = "example.com", cname = "sub.example.com", ttl = 60 } })
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assert.are.same({ "example.com" }, dns.resolve("example.com"))
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assert.spy(s_ngx_log).was_called_with(ngx.ERR, "failed to query the DNS server:\nno record resolved\nno record resolved")
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end)
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it("resolves all A records of given host, caches them with minimal ttl and returns from cache next time", function()
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helpers.mock_resty_dns_query({
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{
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name = "example.com",
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address = "192.168.1.1",
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ttl = 3600,
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},
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{
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name = "example.com",
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address = "1.2.3.4",
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ttl = 60,
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}
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})
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local lrucache = require("resty.lrucache")
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local old_lrucache_new = lrucache.new
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lrucache.new = function(...)
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local cache = old_lrucache_new(...)
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local old_set = cache.set
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cache.set = function(self, key, value, ttl)
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assert.equal("example.com", key)
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assert.are.same({ "192.168.1.1", "1.2.3.4" }, value)
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assert.equal(60, ttl)
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return old_set(self, key, value, ttl)
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end
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return cache
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end
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assert.are.same({ "192.168.1.1", "1.2.3.4" }, dns.resolve("example.com"))
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helpers.mock_resty_dns_new(function(...)
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error("expected to short-circuit and return response from cache")
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end)
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assert.are.same({ "192.168.1.1", "1.2.3.4" }, dns.resolve("example.com"))
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end)
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end)
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