feat(retryable-writes): add support for retryWrites cs option

This allows users to enable support for retryable writes through
the connection string. The option is simply propagated to the core
driver where all the actual work is done.

NODE-1105

lib/collection.js

@@ -3237,6 +3237,9 @@ var writeConcern = function(target, db, col, options) {
     target.writeConcern = db.writeConcern;
   }
 
+  // NOTE: there is probably a much better place for this
+  if (db.s.options.retryWrites) target.retryWrites = true;
+
   return target;
 };
 

lib/db.js

@@ -106,7 +106,8 @@ var legalOptionNames = [
   'promoteBuffers',
   'promoteLongs',
   'promoteValues',
-  'compression'
+  'compression',
+  'retryWrites'
 ];
 
 /**

lib/url_parser.js

@@ -3,7 +3,6 @@
 var ReadPreference = require('./read_preference'),
   parser = require('url'),
   f = require('util').format,
-  assign = require('./utils').assign,
   Logger = require('mongodb-core').Logger,
   dns = require('dns');
 
@@ -17,7 +16,6 @@ module.exports = function(url, options, callback) {
   }
 
   if (result.protocol === 'mongodb+srv:') {
-
     if (result.hostname.split('.').length < 3) {
       return callback(new Error('URI does not have hostname, domain name and tld'));
     }
@@ -552,6 +550,12 @@ function parseConnectionString(url, options) {
         compression.zlibCompressionLevel = zlibCompressionLevel;
         serverOptions.compression = compression;
         break;
+      case 'retryWrites':
+        dbOptions.retryWrites = value === 'true';
+        break;
+      case 'minSize':
+        dbOptions.minSize = parseInt(value, 10);
+        break;
       default:
         var logger = Logger('URL Parser');
         logger.warn(`${name} is not supported as a connection string option`);
@@ -577,7 +581,7 @@ function parseConnectionString(url, options) {
   }
 
   // make sure that user-provided options are applied with priority
-  dbOptions = assign(dbOptions, options);
+  dbOptions = Object.assign(dbOptions, options);
 
   // Add servers to result
   object.servers = servers;

package.json

@@ -13,7 +13,7 @@
     "official"
   ],
   "dependencies": {
-    "mongodb-core": "mongodb-js/mongodb-core#6510d7d3d82d84cc0811a853355deaa918b96941"
+    "mongodb-core": "mongodb-js/mongodb-core#0d74dfd32566d9ab8ebe9ae4b9af736e582e5533"
   },
   "devDependencies": {
     "betterbenchmarks": "^0.1.0",