From a75a01e9b02ff33e96117ca2e6951faa0d156548 Mon Sep 17 00:00:00 2001
From: Andrew Groebe <40124525+agroebe@users.noreply.github.com>
Date: Fri, 4 Sep 2020 11:05:06 -0500
Subject: [PATCH] Utility function for flushing local db (#94)

works only for gremlin version 3.x
---
 graphexp.html             | 3 ++-
 scripts/editGraph.js      | 5 +++++
 scripts/graphioGremlin.js | 7 +++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/graphexp.html b/graphexp.html
index 7ae324c..1116564 100644
--- a/graphexp.html
+++ b/graphexp.html
@@ -164,7 +164,8 @@ <h1 class="header-heading">Graph Explorer v 0.6</h1>
 					<div class="nav input_unit_container", id="editGraph" style="display:none;">
 					     <button onclick="addVertexForm()"   style="height:25px; width:150px" > Add Vertex </button><br>
 					     <button onclick="editVertexForm()"  style="height:25px; width:150px" > Edit Vertex </button><br>
-					     <button onclick="addEditEdgeForm()"     style="height:25px; width:150px" > Add/Edit Edge </button><br>
+						 <button onclick="addEditEdgeForm()"     style="height:25px; width:150px" > Add/Edit Edge </button><br>
+						 <button onclick="flush()"     style="height:25px; width:150px" > Flush </button><br>
 					</div>
 					
 					<div class="nav input_unit_container", id="addVertexForm" style="display:none;">
diff --git a/scripts/editGraph.js b/scripts/editGraph.js
index 89f8847..70c81f1 100644
--- a/scripts/editGraph.js
+++ b/scripts/editGraph.js
@@ -126,5 +126,10 @@
 		editGraph();
 		}
 	}
+
+	function flush() {
+		const gremlin_query = "g.V().drop().iterate()"
+		graphioGremlin.send_to_server(gremlin_query, 'flushGraph', null, "")
+	}
 	
 	
\ No newline at end of file
diff --git a/scripts/graphioGremlin.js b/scripts/graphioGremlin.js
index fbecff3..0da9345 100644
--- a/scripts/graphioGremlin.js
+++ b/scripts/graphioGremlin.js
@@ -344,6 +344,13 @@ var graphioGremlin = (function(){
 			}
 			var data = response.result.data;
 			if (data == null){
+				// No response data expected for flush query, so just validate status code.
+				if (query_type == 'flushGraph' && response.status.code == 204) {
+					$('#outputArea').html("<p> Successfully flushed existing DB data.</p>");
+					$('#messageArea').html('');
+					return
+				}
+
 				if (query_type == 'editGraph'){
 					$('#outputArea').html(response.status.message);
 					$('#messageArea').html('Could not write data to DB.' +