Process metadata and provide to rate process

Prefixes with "meta:".

* src/server/Server.js (initQuote): Initialze metadata to empty.
* src/server/daemon/controller.js (createQuote): Add metabucket.
* src/server/db/MongoServerDao.js (saveQuote): Add additional
  documentation to docblock.  Save all metadata if no bucket data
  provided (which indicates a full quote save).  This happens on
  version change.
* src/server/rater/ProcessManager.js (_genData): Add method to merge
  metadata into bucket data with "meta:" prefix.
  (byId): Use merged data.

src/server/Server.js

@@ -311,6 +311,7 @@ module.exports = Class( 'Server' )
                     .setData(
                         server._getDefaultBucket( quote_program, quote_data )
                     )
+                    .setMetadata( quote_data.meta || {} )
                     .setQuickSaveData( quote_data.quicksave || {} )
                     .setAgentId( quote_data.agentId || agent_id )
                     .setAgentName( quote_data.agentName || agent_name )

src/server/daemon/controller.js

@@ -585,8 +585,11 @@ function createQuote( quote_id, program, request, callback, error_callback )
         );
     }
 
-    var bucket = QuoteDataBucket(),
-        quote  = Quote( quote_id, bucket );
+    var bucket     = QuoteDataBucket(),
+        metabucket = QuoteDataBucket(),
+        quote      = Quote( quote_id, bucket );
+
+    quote.setMetabucket( metabucket );
 
     var controller = this;
     return server.initQuote( quote, program, request,

src/server/db/MongoServerDao.js

@@ -271,6 +271,11 @@ module.exports = Class( 'MongoServerDao' )
     /**
      * Saves a quote to the database
      *
+     * A full save will include all metadata.  This should not cause any
+     * problems with race conditions for pending Data API calls on meta
+     * fields because those results write to individual indexes and do not
+     * rely on existing data.
+     *
      * @param Quote    quote            the quote to save
      * @param Function success_callback function to call on success
      * @param Function failure_callback function to call if save fails
@@ -302,6 +307,9 @@ module.exports = Class( 'MongoServerDao' )
             save_data = {
                 data: quote.getBucket().getData(),
             };
+
+            // full save will include all metadata
+            save_data.meta = quote.getMetabucket().getData();
         }
         else if ( save_data.data !== undefined )
         {

src/server/rater/ProcessManager.js

@@ -211,7 +211,7 @@ module.exports = Class( 'ProcessManager',
                     id:        quote.getId(),
                     agentId:   quote.getAgentId(),
                     agentName: quote.getAgentName(),
-                    data:      quote.getBucket().getData(),
+                    data:      this._genData( quote ),
 
                     creditScoreRef: quote.getCreditScoreRef(),
                 },
@@ -223,6 +223,31 @@ module.exports = Class( 'ProcessManager',
     },
 
 
+    /**
+     * Generate data to provide to rater
+     *
+     * Bucket data is used as-is.  Metadata are merged with a "meta:" prefix.
+     *
+     * @param {ServerSideQuote} quote source quote
+     *
+     * @return {Object} merged data
+     */
+    'private _genData'( quote )
+    {
+        const dest = {};
+        const metadata = quote.getMetabucket().getData();
+
+        Object.assign( dest, quote.getBucket().getData() );
+
+        for ( let key in metadata )
+        {
+            dest[ 'meta:' + key ] = metadata[ key ];
+        }
+
+        return dest;
+    },
+
+
     'private _rateReply'( msg, errc )
     {
         var rqid = msg.rqid,