From b5d32aeed91eb86080744adf75352377d5920d5d Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart@neuron.com>
Date: Sun, 5 Jul 2020 20:14:52 -0400
Subject: [PATCH] use shared kv store when available from app server

---
 app.js | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/app.js b/app.js
index 27ce8064..1b504239 100644
--- a/app.js
+++ b/app.js
@@ -41,7 +41,23 @@ function init(mod) {
     util = mod.util;
     dir = mod.dir;
     log = mod.log;
-    level = require('level')(mod.util.datadir("kvstore"), {valueEncoding:"json"});
+
+    if (mod.util.globdir) {
+        // when globdir available, look for shared kvstore
+        // and if not present, create and share in through env
+        if (mod.env._level) {
+            level = mod.env._level;
+            logger.log("using shared kvstore");
+        } else {
+            level = require('level')(mod.util.globdir("kvstore"), {valueEncoding:"json"});
+            mod.env._level = level;
+            logger.log("creating shared kvstore");
+        }
+    } else {
+        logger.log("fallback to local kvstore");
+        level = require('level')(mod.util.datadir("kvstore"), {valueEncoding:"json"});
+    }
+
     cacheDir = mod.util.datadir("cache");
 
     mod.on.reload(() => level.close());