Emit access-logs via pelias-logger.

(app, middleware/access_log).js
	-Move the logic that determines whether access logging is
	necessary to app.js, since that allows us to maintain the style
	of `app.use(require(/* desired middleware module */))` inside
	`app.js` without returning a "noop" middleware from
	`middleware/access_log.js` in the case that it's unnecessary.

app.js

@@ -1,7 +1,10 @@
 
 var app = require('express')();
+var peliasConfig = require( 'pelias-config' ).generate().api;
 
-app.use( require( './middleware/access_log' ) );
+if( peliasConfig.accessLog ){
+  app.use( require( './middleware/access_log' )( peliasConfig.accessLog ) );
+}
 
 /** ----------------------- middleware ----------------------- **/
 

middleware/access_log.js

@@ -1,14 +1,20 @@
 /**
- * Print out access logs.
+ * Create a middleware that prints access logs via pelias-logger.
  */
 
 'use strict';
 
-var peliasConfig = require( 'pelias-config' ).generate().api;
 var morgan = require( 'morgan' );
+var through = require( 'through2' );
+var peliasLogger = require( 'pelias-logger' ).get( 'api' );
 
-module.exports = peliasConfig.accessLog ?
-  morgan( peliasConfig.accessLog ) :
-  function noop(req, res, next){
+function createAccessLogger( logFormat ){
+  return morgan( logFormat, {
+    stream: through( function write( ln, _, next ){
+      peliasLogger.info( ln.toString().trim() );
       next();
-  };
+    })
+  });
+}
+
+module.exports = createAccessLogger;

package.json

@@ -42,6 +42,7 @@
     "markdown": "0.5.0",
     "pelias-esclient": "0.0.25",
     "pelias-logger": "^0.0.8",
+    "through2": "0.6.5",
     "morgan": "1.5.2",
     "pelias-config": "^0.1.4",
     "pelias-suggester-pipeline": "2.0.2"