Add Option for HTTP Server keepAliveTimeout (#199)

This PR adds an option `keepAliveTimeout`. This option, defaulted to `5000`, specifies the number of milliseconds the server should wait before moving on. The primary use case is to help me debug other tools that use ganache; I get timeouts while I step through code. See https://nodejs.org/api/http.html#http_server_keepalivetimeout for more details

README.md

@@ -61,6 +61,7 @@ Both `.provider()` and `.server()` take a single object which allows you to spec
 * `"allowUnlimitedContractSize"`: Allows unlimited contract sizes while debugging. By setting this to `true`, the check within the EVM for contract size limit of 24KB (see [EIP-170](https://git.io/vxZkK)) is bypassed. Setting this to `true` **will** cause `ganache-core` to behave differently than production environments. (default: `false`; **ONLY** set to `true` during debugging).
 * `"gasPrice"`: Sets the default gas price for transactions if not otherwise specified. Must be specified as a hex string in wei. Defaults to `"0x77359400"`, or 2 gwei.
 * `"gasLimit"`: Sets the block gas limit. Must be specified as a hex string. Defaults to `"0x6691b7"`.
+* `"keepAliveTimeout"`: If using `.server()` - Sets the HTTP server's `keepAliveTimeout` in milliseconds. See the [NodeJS HTTP docs](https://bit.ly/2Cr0ZEh) for details. `5000` by default.
 
 # IMPLEMENTED METHODS
 

lib/server.js

@@ -14,6 +14,7 @@ module.exports = {
     var provider = new Provider(options);
 
     var server = httpServer(provider, logger);
+    server.keepAliveTimeout = options.keepAliveTimeout;
 
     let connectionCounter = 0;
     const connections = {};
@@ -77,7 +78,8 @@ const defaultOptions = {
   logger: {
     log: function() {}
   },
-  ws: true
+  ws: true,
+  keepAliveTimeout: 5000
 }
 
 var _applyDefaultOptions = function(options) {