WIP: initial prototype

- Added keep-alive Agent
- Added support for HTTPS
- Added log events

lib/Connection.js

@@ -1,31 +1,47 @@
 'use strict'
 
 const assert = require('assert')
-const debug = require('debug')('elasticsearch')
+const { Agent: HttpAgent } = require('http')
+const { Agent: HttpsAgent } = require('https')
 const { resolve } = require('url')
+const debug = require('debug')('elasticsearch')
 const makeRequest = require('simple-get')
 
 class Connection {
   constructor (opts = {}) {
-    assert(opts.url, 'Missing url')
+    assert(opts.host, 'Missing host data')
 
-    this.url = opts.url
-    this.id = opts.id || opts.url
+    this.host = opts.host
+    this.ssl = opts.host.ssl || opts.ssl || null
+    this.id = opts.id || opts.host.href
     this.deadCount = 0
     this.resurrectTimeout = 0
 
     this._status = opts.status || Connection.statuses.ALIVE
     this.roles = opts.roles || defaultRoles
+
+    const agentOptions = Object.assign({}, {
+      keepAlive: true,
+      keepAliveMsecs: 1000,
+      maxSockets: Infinity,
+      maxFreeSockets: 256,
+      timeout: 60000
+    }, opts.host.agent || opts.agent)
+    this._agent = this.host.protocol === 'http:'
+      ? new HttpAgent(agentOptions)
+      : new HttpsAgent(Object.assign({}, agentOptions, this.ssl))
   }
 
   request (params, callback) {
-    params.url = resolve(this.url, params.path)
+    params.url = resolve(this.host.href, params.path)
+    params.agent = this._agent
     debug('Starting a new request', params)
     return makeRequest(params, callback)
   }
 
   close () {
-    debug('Closing connection')
+    debug('Closing connection', this.id)
+    this._agent.destroy()
   }
 
   setRole (role, enabled) {