DevFW-CICD/ingress-nginx-helm
6
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Dynamic LB sync non-external backends only when necessary

Browse source
This commit is contained in:
Manuel Alejandro de Brito Fontes 2020-06-16 17:32:59 -04:00
parent 10dcf0db15
commit bcc3cfaa65
4 changed files with 91 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

30
rootfs/etc/nginx/lua/balancer.lua
View file

@ -23,6 +23,7 @@ local ngx = ngx
-- it will take <the delay until controller POSTed the backend object to the
-- Nginx endpoint> + BACKENDS_SYNC_INTERVAL
local BACKENDS_SYNC_INTERVAL = 1
local BACKENDS_FORCE_SYNC_INTERVAL = 30
local DEFAULT_LB_ALG = "round_robin"
local IMPLEMENTATIONS = {
@ -36,6 +37,8 @@ local IMPLEMENTATIONS = {
local _M = {}
local balancers = {}
local backends_with_external_name = {}
local backends_last_synced_at = 0
local function get_implementation(backend)
local name = backend["load-balance"] or DEFAULT_LB_ALG
@ -92,6 +95,12 @@ local function format_ipv6_endpoints(endpoints)
return formatted_endpoints
end
local function is_backend_with_external_name(backend)
local serv_type = backend.service and backend.service.spec
and backend.service.spec["type"]
return serv_type == "ExternalName"
end
local function sync_backend(backend)
if not backend.endpoints or #backend.endpoints == 0 then
balancers[backend.name] = nil
@ -117,9 +126,7 @@ local function sync_backend(backend)
return
end
local service_type = backend.service and backend.service.spec
and backend.service.spec["type"]
if service_type == "ExternalName" then
if is_backend_with_external_name(backend) then
backend = resolve_external_names(backend)
end
@ -129,6 +136,17 @@ local function sync_backend(backend)
end
local function sync_backends()
local raw_backends_last_synced_at = configuration.get_raw_backends_last_synced_at()
ngx.update_time()
local current_timestamp = ngx.time()
if current_timestamp - backends_last_synced_at < BACKENDS_FORCE_SYNC_INTERVAL
and raw_backends_last_synced_at <= backends_last_synced_at then
for _, backend_with_external_name in pairs(backends_with_external_name) do
sync_backend(backend_with_external_name)
end
return
end
local backends_data = configuration.get_backends_data()
if not backends_data then
balancers = {}
@ -145,13 +163,19 @@ local function sync_backends()
for _, new_backend in ipairs(new_backends) do
sync_backend(new_backend)
balancers_to_keep[new_backend.name] = balancers[new_backend.name]
if is_backend_with_external_name(new_backend) then
local backend_with_external_name = util.deepcopy(new_backend)
backends_with_external_name[backend_with_external_name.name] = backend_with_external_name
end
end
for backend_name, _ in pairs(balancers) do
if not balancers_to_keep[backend_name] then
balancers[backend_name] = nil
backends_with_external_name[backend_name] = nil
end
end
backends_last_synced_at = raw_backends_last_synced_at
end
local function route_to_alternative_balancer(balancer)