move cache to lua to minimise number of requests
This commit is contained in:
Karol Wypchlo
parent
9737f22fed
commit
81a1338f00
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@ -1,3 +1,5 @@
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lua_shared_dict dnslink 10m;
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server {
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listen 80 default_server;
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listen [::]:80 default_server;
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@ -5,28 +5,38 @@ location / {
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set $path $uri;
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rewrite_by_lua_block {
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local httpc = require("resty.http").new()
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local cache = ngx.shared.dnslink
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local cache_value = cache:get(ngx.var.host)
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-- 10.10.10.55 points to dnslink-api service (alias not available when using resty-http)
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local res, err = httpc:request_uri("http://10.10.10.55:3100/dnslink/" .. ngx.var.host)
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if cache_value == nil then
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local httpc = require("resty.http").new()
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if err or (res and res.status ~= ngx.HTTP_OK) then
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-- check whether we can fallback to regular skylink request
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local match_skylink = ngx.re.match(ngx.var.uri, "^/([a-zA-Z0-9-_]{46}|[a-z0-9]{55})(/.*)?")
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-- 10.10.10.55 points to dnslink-api service (alias not available when using resty-http)
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local res, err = httpc:request_uri("http://10.10.10.55:3100/dnslink/" .. ngx.var.host)
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if match_skylink then
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ngx.var.skylink = match_skylink[1]
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ngx.var.path = match_skylink[2] or "/"
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if err or (res and res.status ~= ngx.HTTP_OK) then
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-- check whether we can fallback to regular skylink request
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local match_skylink = ngx.re.match(ngx.var.uri, "^/([a-zA-Z0-9-_]{46}|[a-z0-9]{55})(/.*)?")
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if match_skylink then
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ngx.var.skylink = match_skylink[1]
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ngx.var.path = match_skylink[2] or "/"
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else
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ngx.status = (err and ngx.HTTP_INTERNAL_SERVER_ERROR) or res.status
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ngx.header["content-type"] = "text/plain"
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ngx.say(err or res.body)
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ngx.exit(ngx.status)
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end
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else
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ngx.status = (err and ngx.HTTP_INTERNAL_SERVER_ERROR) or res.status
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ngx.header["content-type"] = "text/plain"
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ngx.say(err or res.body)
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ngx.exit(ngx.status)
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ngx.var.skylink = res.body
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end
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local cache_ttl = 300 -- 5 minutes cache expire time
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cache:set(ngx.var.host, ngx.var.skylink, cache_ttl)
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else
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ngx.var.skylink = res.body
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ngx.var.skylink = cache_value
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end
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ngx.var.skylink_v1 = ngx.var.skylink
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ngx.var.skylink_v2 = ngx.var.skylink
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}
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@ -5,8 +5,7 @@
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"license": "SEE LICENSE IN LICENSE.md",
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"dependencies": {
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"express": "^4.17.1",
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"is-valid-domain": "^0.1.2",
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"node-cache": "^5.1.2"
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"is-valid-domain": "^0.1.2"
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},
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"devDependencies": {
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"prettier": "^2.4.1"
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@ -1,14 +1,11 @@
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const dns = require("dns");
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const express = require("express");
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const NodeCache = require("node-cache");
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const isValidDomain = require("is-valid-domain");
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const host = process.env.DNSLINK_API_HOSTNAME || "0.0.0.0";
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const port = Number(process.env.DNSLINK_API_PORT) || 3100;
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const cacheTTL = Number(process.env.DNSLINK_API_CACHE_TTL) || 300; // default to 5 minutes
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const server = express();
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const cache = new NodeCache({ stdTTL: cacheTTL });
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const dnslinkNamespace = "skynet-ns";
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const dnslinkRegExp = new RegExp(`^dnslink=/${dnslinkNamespace}/.+$`);
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@ -23,10 +20,6 @@ server.get("/dnslink/:name", async (req, res) => {
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return failure(`"${req.params.name}" is not a valid domain`);
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}
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if (cache.has(req.params.name)) {
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return success(cache.get(req.params.name));
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}
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const lookup = `_dnslink.${req.params.name}`;
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dns.resolveTxt(lookup, (error, records) => {
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@ -65,8 +58,6 @@ server.get("/dnslink/:name", async (req, res) => {
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const skylink = matchSkylink[1];
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cache.set(req.params.name, skylink);
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console.log(`${req.params.name} => ${skylink}`);
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return success(skylink);
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@ -36,11 +36,6 @@ bytes@3.1.0:
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resolved "https://registry.yarnpkg.com/bytes/-/bytes-3.1.0.tgz#f6cf7933a360e0588fa9fde85651cdc7f805d1f6"
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integrity sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg==
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clone@2.x:
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version "2.1.2"
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resolved "https://registry.yarnpkg.com/clone/-/clone-2.1.2.tgz#1b7f4b9f591f1e8f83670401600345a02887435f"
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integrity sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18=
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content-disposition@0.5.3:
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version "0.5.3"
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resolved "https://registry.yarnpkg.com/content-disposition/-/content-disposition-0.5.3.tgz#e130caf7e7279087c5616c2007d0485698984fbd"
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@ -257,13 +252,6 @@ negotiator@0.6.2:
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resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.2.tgz#feacf7ccf525a77ae9634436a64883ffeca346fb"
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integrity sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==
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node-cache@^5.1.2:
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version "5.1.2"
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resolved "https://registry.yarnpkg.com/node-cache/-/node-cache-5.1.2.tgz#f264dc2ccad0a780e76253a694e9fd0ed19c398d"
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integrity sha512-t1QzWwnk4sjLWaQAS8CHgOJ+RAfmHpxFWmc36IWTiWHQfs0w5JDMBS1b1ZxQteo0vVVuWJvIUKHDkkeK7vIGCg==
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dependencies:
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clone "2.x"
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on-finished@~2.3.0:
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version "2.3.0"
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resolved "https://registry.yarnpkg.com/on-finished/-/on-finished-2.3.0.tgz#20f1336481b083cd75337992a16971aa2d906947"
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