Merge pull request #24 from ryanbreen/master

Support arbitrary default meta values.

lib/winston-logstash.js

@@ -31,6 +31,14 @@ var Logstash = exports.Logstash = function (options) {
   this.ssl_cert            = options.ssl_cert || '';
   this.ca                  = options.ca || '';
   this.ssl_passphrase      = options.ssl_passphrase || '';
+  this.meta_defaults       = options.meta || {};
+
+  // We want to avoid copy-by-reference for meta defaults, so make sure it's a flat object.
+  for (var property in this.meta_defaults) {
+    if (typeof this.meta_defaults[property] === 'object') {
+      delete this.meta_defaults[property];
+    }
+  }
 
   this.label = options.label || this.node_name;
 
@@ -63,6 +71,10 @@ Logstash.prototype.log = function (level, msg, meta, callback) {
   var self = this,
       meta = winston.clone(meta || {}),
       log_entry;
+
+  for (var property in this.meta_defaults) {
+    meta[property] = this.meta_defaults[property];
+  }
 
   if (self.silent) {
     return callback(null, true);