Bind cacheable-lookup to custom http agent

server/cacheable-dns-http-agent.js

@@ -0,0 +1,50 @@
+const https = require("https");
+const http = require("http");
+const CacheableLookup = require("cacheable-lookup");
+
+class CacheableDnsHttpAgent {
+
+    static cacheable = new CacheableLookup();
+
+    static httpAgentList = {};
+    static httpsAgentList = {};
+
+    /**
+     * Register cacheable to global agents
+     */
+    static registerGlobalAgent() {
+        this.cacheable.install(http.globalAgent);
+        this.cacheable.install(https.globalAgent);
+    }
+
+    /**
+     * @var {https.AgentOptions} agentOptions
+     * @return {https.Agent}
+     */
+    static getHttpsAgent(agentOptions) {
+        let key = JSON.stringify(agentOptions);
+        if (!(key in this.httpsAgentList)) {
+            this.httpsAgentList[key] = new https.Agent(agentOptions);
+            this.cacheable.install(this.httpsAgentList[key]);
+        }
+        return this.httpsAgentList[key];
+    }
+
+    /**
+     * @var {http.AgentOptions} agentOptions
+     * @return {https.Agents}
+     */
+    static getHttpAgent(agentOptions) {
+        let key = JSON.stringify(agentOptions);
+        if (!(key in this.httpAgentList)) {
+            this.httpAgentList[key] = new http.Agent(agentOptions);
+            this.cacheable.install(this.httpAgentList[key]);
+        }
+        return this.httpAgentList[key];
+    }
+
+}
+
+module.exports = {
+    CacheableDnsHttpAgent,
+};