Send logdna now argument in milliseconds (#23)

* Send logdna now argument in milliseconds

* update readme

* consistent naming

* simplify millitimestamp retrieval

README.md

@@ -55,6 +55,15 @@ Monolog Processors may add some extra data to the log records.
 This data will appear in logdna log metadata as property `monolog_extra` unless it is empty.
 If such a property already exists in the log record's `context`, it will be overwritten.
 
+## Time Drift Calculation
+
+By default, the handler sends `now` parameter to the [Ingestion API](https://docs.mezmo.com/log-analysis-api#ingest), 
+which is used to calculate time drift. You can disable sending this parameter via
+
+```
+$logdnaHandler->setIncludeRequestTime(false);
+```
+
 ## License
 
 This project is licensed under LGPL3.0. See `LICENSE` file for details.

src/Monolog/Handler/LogdnaHandler.php

@@ -46,6 +46,11 @@ class LogdnaHandler extends \Monolog\Handler\AbstractProcessingHandler
      */
     private $tags = '';
 
+    /**
+     * @var bool
+     */
+    private $include_request_time = true;
+
     /**
      * @var resource $curl_handle
      */
@@ -75,6 +80,14 @@ public function setTags($tags)
         $this->tags = $tags;
     }
 
+    /**
+     * @param bool $include
+     */
+    public function setIncludeRequestTime($include)
+    {
+        $this->include_request_time = $include;
+    }
+
     /**
      * @param string $ingestion_key
      * @param string $hostname
@@ -108,6 +121,11 @@ protected function write(\Monolog\LogRecord $record): void
             'ip' => $this->ip,
             'tags' => $this->tags
         ];
+
+        if ($this->include_request_time) {
+            $query['now'] = (string) \floor(\microtime(true) * 1000.0);
+        }
+
         $url = 'https://logs.mezmo.com/logs/ingest?' . \http_build_query(\array_filter($query));
 
         \curl_setopt($this->curl_handle, CURLOPT_URL, $url);