| -- |
| -- Licensed to the Apache Software Foundation (ASF) under one or more |
| -- contributor license agreements. See the NOTICE file distributed with |
| -- this work for additional information regarding copyright ownership. |
| -- The ASF licenses this file to You under the Apache License, Version 2.0 |
| -- (the "License"); you may not use this file except in compliance with |
| -- the License. You may obtain a copy of the License at |
| -- |
| -- http://www.apache.org/licenses/LICENSE-2.0 |
| -- |
| -- Unless required by applicable law or agreed to in writing, software |
| -- distributed under the License is distributed on an "AS IS" BASIS, |
| -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| -- See the License for the specific language governing permissions and |
| -- limitations under the License. |
| -- |
| local healthcheck = require("resty.healthcheck") |
| local roundrobin = require("resty.roundrobin") |
| local resty_chash = require("resty.chash") |
| local balancer = require("ngx.balancer") |
| local core = require("apisix.core") |
| local error = error |
| local str_char = string.char |
| local str_gsub = string.gsub |
| local pairs = pairs |
| local tostring = tostring |
| local set_more_tries = balancer.set_more_tries |
| local get_last_failure = balancer.get_last_failure |
| local set_timeouts = balancer.set_timeouts |
| local upstreams_etcd |
| |
| |
| local module_name = "balancer" |
| |
| |
| local lrucache_server_picker = core.lrucache.new({ |
| ttl = 300, count = 256 |
| }) |
| local lrucache_checker = core.lrucache.new({ |
| ttl = 300, count = 256 |
| }) |
| |
| |
| local _M = { |
| version = 0.1, |
| name = module_name, |
| } |
| |
| |
| local function fetch_health_nodes(upstream, checker) |
| if not checker then |
| return upstream.nodes |
| end |
| |
| local host = upstream.checks and upstream.checks.host |
| local up_nodes = core.table.new(0, #upstream.nodes) |
| |
| for addr, weight in pairs(upstream.nodes) do |
| local ip, port = core.utils.parse_addr(addr) |
| local ok = checker:get_target_status(ip, port, host) |
| if ok then |
| up_nodes[addr] = weight |
| end |
| end |
| |
| if core.table.nkeys(up_nodes) == 0 then |
| core.log.warn("all upstream nodes is unhealth, use default") |
| up_nodes = upstream.nodes |
| end |
| |
| return up_nodes |
| end |
| |
| |
| local function create_checker(upstream, healthcheck_parent) |
| local checker = healthcheck.new({ |
| name = "upstream#" .. healthcheck_parent.key, |
| shm_name = "upstream-healthcheck", |
| checks = upstream.checks, |
| }) |
| |
| for addr, weight in pairs(upstream.nodes) do |
| local ip, port = core.utils.parse_addr(addr) |
| local ok, err = checker:add_target(ip, port, upstream.checks.host) |
| if not ok then |
| core.log.error("failed to add new health check target: ", addr, |
| " err: ", err) |
| end |
| end |
| |
| if upstream.parent then |
| core.table.insert(upstream.parent.clean_handlers, function () |
| core.log.info("try to release checker: ", tostring(checker)) |
| checker:stop() |
| end) |
| |
| else |
| core.table.insert(healthcheck_parent.clean_handlers, function () |
| core.log.info("try to release checker: ", tostring(checker)) |
| checker:stop() |
| end) |
| end |
| |
| core.log.info("create new checker: ", tostring(checker)) |
| return checker |
| end |
| |
| |
| local function fetch_healthchecker(upstream, healthcheck_parent, version) |
| if not upstream.checks then |
| return |
| end |
| |
| if upstream.checker then |
| return |
| end |
| |
| local checker = lrucache_checker(upstream, version, |
| create_checker, upstream, |
| healthcheck_parent) |
| return checker |
| end |
| |
| |
| local function create_server_picker(upstream, checker) |
| if upstream.type == "roundrobin" then |
| local up_nodes = fetch_health_nodes(upstream, checker) |
| core.log.info("upstream nodes: ", core.json.delay_encode(up_nodes)) |
| |
| local picker = roundrobin:new(up_nodes) |
| return { |
| upstream = upstream, |
| get = function () |
| return picker:find() |
| end |
| } |
| end |
| |
| if upstream.type == "chash" then |
| local up_nodes = fetch_health_nodes(upstream, checker) |
| core.log.info("upstream nodes: ", core.json.delay_encode(up_nodes)) |
| |
| local str_null = str_char(0) |
| |
| local servers, nodes = {}, {} |
| for serv, weight in pairs(up_nodes) do |
| local id = str_gsub(serv, ":", str_null) |
| |
| servers[id] = serv |
| nodes[id] = weight |
| end |
| |
| local picker = resty_chash:new(nodes) |
| local key = upstream.key |
| return { |
| upstream = upstream, |
| get = function (ctx) |
| local id = picker:find(ctx.var[key]) |
| -- core.log.warn("chash id: ", id, " val: ", servers[id]) |
| return servers[id] |
| end |
| } |
| end |
| |
| return nil, "invalid balancer type: " .. upstream.type, 0 |
| end |
| |
| |
| local function pick_server(route, ctx) |
| core.log.info("route: ", core.json.delay_encode(route, true)) |
| core.log.info("ctx: ", core.json.delay_encode(ctx, true)) |
| local healthcheck_parent = route |
| local up_id = route.value.upstream_id |
| local up_conf = (route.dns_value and route.dns_value.upstream) |
| or route.value.upstream |
| if not up_id and not up_conf then |
| return nil, nil, "missing upstream configuration" |
| end |
| |
| local version |
| local key |
| |
| if up_id then |
| if not upstreams_etcd then |
| return nil, nil, "need to create a etcd instance for fetching " |
| .. "upstream information" |
| end |
| |
| local up_obj = upstreams_etcd:get(tostring(up_id)) |
| if not up_obj then |
| return nil, nil, "failed to find upstream by id: " .. up_id |
| end |
| core.log.info("upstream: ", core.json.delay_encode(up_obj)) |
| |
| healthcheck_parent = up_obj |
| up_conf = up_obj.dns_value or up_obj.value |
| version = up_obj.modifiedIndex |
| key = up_conf.type .. "#upstream_" .. up_id |
| |
| else |
| version = ctx.conf_version |
| key = up_conf.type .. "#route_" .. route.value.id |
| end |
| |
| local checker = fetch_healthchecker(up_conf, healthcheck_parent, version) |
| local retries = up_conf.retries |
| if retries and retries > 0 then |
| ctx.balancer_try_count = (ctx.balancer_try_count or 0) + 1 |
| if checker and ctx.balancer_try_count > 1 then |
| local state, code = get_last_failure() |
| if state == "failed" then |
| if code == 504 then |
| checker:report_timeout(ctx.balancer_ip, ctx.balancer_port, |
| up_conf.checks.host) |
| else |
| checker:report_tcp_failure(ctx.balancer_ip, |
| ctx.balancer_port, up_conf.checks.host) |
| end |
| |
| else |
| checker:report_http_status(ctx.balancer_ip, ctx.balancer_port, |
| up_conf.checks.host, code) |
| end |
| end |
| |
| if ctx.balancer_try_count == 1 then |
| set_more_tries(retries) |
| end |
| end |
| |
| if checker then |
| version = version .. "#" .. checker.status_ver |
| end |
| |
| local server_picker = lrucache_server_picker(key, version, |
| create_server_picker, up_conf, checker) |
| if not server_picker then |
| return nil, nil, "failed to fetch server picker" |
| end |
| |
| local server, err = server_picker.get(ctx) |
| if not server then |
| err = err or "no valid upstream node" |
| return nil, nil, "failed to find valid upstream server, " .. err |
| end |
| |
| if up_conf.timeout then |
| local timeout = up_conf.timeout |
| local ok, err = set_timeouts(timeout.connect, timeout.send, |
| timeout.read) |
| if not ok then |
| core.log.error("could not set upstream timeouts: ", err) |
| end |
| end |
| |
| local ip, port, err = core.utils.parse_addr(server) |
| ctx.balancer_ip = ip |
| ctx.balancer_port = port |
| |
| return ip, port, err |
| end |
| -- for test |
| _M.pick_server = pick_server |
| |
| |
| function _M.run(route, ctx) |
| local ip, port, err = pick_server(route, ctx) |
| if err then |
| core.log.error("failed to pick server: ", err) |
| return core.response.exit(502) |
| end |
| |
| local ok, err = balancer.set_current_peer(ip, port) |
| if not ok then |
| core.log.error("failed to set server peer: ", err) |
| return core.response.exit(502) |
| end |
| |
| ctx.proxy_passed = true |
| end |
| |
| |
| function _M.init_worker() |
| local err |
| upstreams_etcd, err = core.config.new("/upstreams", { |
| automatic = true, |
| item_schema = core.schema.upstream, |
| filter = function(upstream) |
| upstream.has_domain = false |
| if not upstream.value then |
| return |
| end |
| |
| for addr, _ in pairs(upstream.value.nodes or {}) do |
| local host = core.utils.parse_addr(addr) |
| if not core.utils.parse_ipv4(host) and |
| not core.utils.parse_ipv6(host) then |
| upstream.has_domain = true |
| break |
| end |
| end |
| |
| core.log.info("filter upstream: ", |
| core.json.delay_encode(upstream)) |
| end, |
| }) |
| if not upstreams_etcd then |
| error("failed to create etcd instance for fetching upstream: " .. err) |
| return |
| end |
| end |
| |
| |
| return _M |