| -- Copyright (c) 2016 IBM. All rights reserved. |
| -- |
| -- Permission is hereby granted, free of charge, to any person obtaining a |
| -- copy of this software and associated documentation files (the "Software"), |
| -- to deal in the Software without restriction, including without limitation |
| -- the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| -- and/or sell copies of the Software, and to permit persons to whom the |
| -- Software is furnished to do so, subject to the following conditions: |
| -- |
| -- The above copyright notice and this permission notice shall be included in |
| -- all copies or substantial portions of the Software. |
| -- |
| -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| -- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| -- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| -- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| -- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| -- FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| -- DEALINGS IN THE SOFTWARE. |
| |
| --- @module |
| -- |
| -- @author Alex Song (songs) |
| |
| local cjson = require "cjson" |
| local filemgmt = require "lib/filemgmt" |
| local utils = require "lib/utils" |
| |
| local BASE_CONF_DIR = "/etc/api-gateway/managed_confs/" |
| |
| local subscribed = false |
| |
| local _M = {} |
| |
| --- Initialize and connect to Redis |
| -- @param host |
| -- @param port |
| -- @param password |
| -- @param timeout |
| -- @param ngx |
| function _M.init(host, port, password, timeout, ngx) |
| local redis = require "resty.redis" |
| local red = redis:new() |
| red:set_timeout(timeout) |
| |
| -- Connect to Redis server |
| local connect, err = red:connect(host, port) |
| if not connect then |
| ngx.status = 500 |
| ngx.say(utils.concatStrings({"Failed to connect to redis: ", err})) |
| ngx.exit(ngx.status) |
| end |
| |
| -- Authenticate with Redis |
| if password ~= nil and password ~= "" then |
| local res, err = red:auth(password) |
| if not res then |
| ngx.status = 500 |
| ngx.say(utils.concatStrings({"Failed to authenticate: ", err})) |
| ngx.exit(ngx.status) |
| end |
| end |
| |
| return red |
| end |
| |
| --- Add current redis connection in the ngx_lua cosocket connection pool |
| -- @param red |
| -- @param ngx |
| function _M.close(red, ngx) |
| -- put it into the connection pool of size 100, with 10 seconds max idle time |
| local ok, err = red:set_keepalive(10000, 100) |
| if not ok then |
| ngx.status = 500 |
| ngx.say("failed to set keepalive: ", err) |
| ngx.exit(ngx.status) |
| end |
| end |
| |
| --- Generate Redis object for route |
| -- @param red |
| -- @param key |
| -- @param gatewayMethod |
| -- @param backendUrl |
| -- @param backendMethod |
| -- @param policies |
| -- @param ngx |
| function _M.generateRouteObj(red, key, gatewayMethod, backendUrl, backendMethod, policies, ngx) |
| local routeObj = _M.getRoute(red, key, "route", ngx) |
| if routeObj == nil then |
| local newRoute = { |
| [gatewayMethod] = { |
| backendUrl = backendUrl, |
| backendMethod = backendMethod, |
| policies = policies |
| } |
| } |
| return cjson.encode(newRoute) |
| else |
| local decoded = cjson.decode(routeObj) |
| decoded[gatewayMethod] = { |
| backendUrl = backendUrl, |
| backendMethod = backendMethod, |
| policies = policies |
| } |
| return cjson.encode(decoded) |
| end |
| end |
| |
| --- Create/update route in redis |
| -- @param red |
| -- @param key |
| -- @param field |
| -- @param routeObj |
| -- @param ngx |
| function _M.createRoute(red, key, field, routeObj, ngx) |
| -- Add/update route to redis |
| local ok, err = red:hset(key, field, routeObj) |
| if not ok then |
| ngx.status = 500 |
| ngx.say(utils.concatStrings({"Failed adding Route to redis: ", err})) |
| ngx.exit(ngx.status) |
| end |
| end |
| |
| --- Get route in redis |
| -- @param red |
| -- @param key |
| -- @param field |
| -- @param ngx |
| -- @return routeObj |
| function _M.getRoute(red, key, field, ngx) |
| local routeObj, err = red:hget(key, field) |
| if not routeObj then |
| ngx.status = 500 |
| ngx.say("Error getting route: ", err) |
| ngx.exit(ngx.status) |
| end |
| |
| -- return nil if route doesn't exist |
| if routeObj == ngx.null then |
| return nil |
| end |
| |
| -- Get routeObj from redis using redisKey |
| local args = ngx.req.get_uri_args() |
| local requestVerb = nil |
| for k, v in pairs(args) do |
| if k == "verb" then |
| requestVerb = v |
| end |
| end |
| |
| if requestVerb == nil then |
| return routeObj |
| else |
| routeObj = cjson.decode(routeObj) |
| return cjson.encode(routeObj[requestVerb]) |
| end |
| end |
| |
| --- Delete route int redis |
| -- @param red |
| -- @param key |
| -- @param field |
| -- @param ngx |
| function _M.deleteRoute(red, key, field, ngx) |
| local routeObj, err = red:hget(key, field) |
| if not routeObj then |
| ngx.status = 500 |
| ngx.say("Error deleting route: ", err) |
| ngx.exit(ngx.status) |
| end |
| |
| if routeObj == ngx.null then |
| ngx.status = 404 |
| ngx.say("Route doesn't exist.") |
| ngx.exit(ngx.status) |
| end |
| |
| local ok, err = red:del(key) |
| if not ok then |
| ngx.status = 500 |
| ngx.say("Error deleing route: ", err) |
| ngx.exit(ngx.status) |
| end |
| end |
| |
| |
| --- Subscribe to redis |
| -- @param red |
| -- @param ngx |
| function _M.subscribe(red, ngx) |
| ngx.say("Subscribed to redis and listening for key changes...") |
| ngx.flush(true) |
| subscribe(red) |
| |
| ngx.exit(ngx.status) |
| end |
| |
| function subscribe(red) |
| local ok, err = red:psubscribe("__keyspace@0__:routes:*:*") |
| if not ok then |
| ngx.status = 500 |
| ngx.say("Subscribe error: ", err) |
| ngx.exit(ngx.status) |
| end |
| while true do |
| local res, err = red:read_reply() |
| if not res then |
| if err ~= "timeout" then |
| ngx.say("Read reply error: ", err) |
| ngx.exit(ngx.status) |
| end |
| else |
| local index = 1 |
| local redisKey = "" |
| local namespace = "" |
| for word in string.gmatch(res[3], '([^:]+)') do |
| if index == 2 then |
| redisKey = utils.concatStrings({redisKey, word, ":"}) |
| elseif index == 3 then |
| namespace = word |
| redisKey = utils.concatStrings({redisKey, namespace, ":"}) |
| elseif index == 4 then |
| gatewayPath = word |
| redisKey = utils.concatStrings({redisKey, gatewayPath}) |
| end |
| index = index + 1 |
| end |
| local ok, err = red:punsubscribe("__keyspace@0__:routes:*:*") |
| if not ok then |
| ngx.status = 500 |
| ngx.say("Unsubscribe error: ", err) |
| ngx.exit(ngx.status) |
| end |
| |
| local routeObj = _M.getRoute(red, redisKey, "route", ngx) |
| _M.createRoute(red, redisKey, "route", routeObj, ngx) |
| filemgmt.createRouteConf(BASE_CONF_DIR, namespace, gatewayPath, routeObj) |
| ngx.say(utils.concatStrings({redisKey, " updated"})) |
| ngx.log(ngx.INFO, utils.concatStrings({redisKey, " updated"})) |
| ngx.flush(true) |
| |
| local ok, err = red:psubscribe("__keyspace@0__:routes:*:*") |
| if not ok then |
| ngx.status = 500 |
| ngx.say("Subscribe error: ", err) |
| ngx.exit(ngx.status) |
| end |
| end |
| end |
| ngx.exit(ngx.status) |
| end |
| |
| |
| --- Unsubscribe from redis |
| function _M.unsubscribe(red, ngx) |
| local ok, err = red:unsubscribe("__keyspace@0__:routes:*:*") |
| if not ok then |
| ngx.status = 500 |
| ngx.say("Unsubscribe error: ", err) |
| ngx.exit(ngx.status) |
| end |
| |
| _M.close(red, ngx) |
| |
| subscribed = false |
| ngx.say("Unsubscribed from redis") |
| ngx.exit(ngx.status) |
| end |
| |
| return _M |