From d3b14106a9c1ba4855b94bcb5cfef37028706d83 Mon Sep 17 00:00:00 2001
From: Quentin Machu <me@quentin-machu.fr>
Date: Fri, 5 Feb 2016 18:08:23 -0500
Subject: [PATCH] database: ignore insertLayer collisions to make it truly
 idempotent

---
 database/pgsql/layer.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/database/pgsql/layer.go b/database/pgsql/layer.go
index cf0200ba..b5bd7342 100644
--- a/database/pgsql/layer.go
+++ b/database/pgsql/layer.go
@@ -265,6 +265,11 @@ func (pgSQL *pgSQL) InsertLayer(layer database.Layer) error {
 			Scan(&layer.ID)
 		if err != nil {
 			tx.Rollback()
+
+			if isErrUniqueViolation(err) {
+				// Ignore this error, another process collided.
+				return nil
+			}
 			return handleError("i_layer", err)
 		}
 	} else {