support for setting max memory for app

.env-sample

@@ -49,3 +49,6 @@
 
 #BTCEXP_GANALYTICS_TRACKING=UA-XXXX-X
 #BTCEXP_SENTRY_URL=https://00000fffffff@sentry.io/XXXX
+
+# Optional value for "max_old_space_size", default: 1024
+#BTCEXP_OLD_SPACE_MAX_SIZE=2048

bin/cli.js

@@ -25,6 +25,7 @@ const args = require('meow')(`
       --demo                         enable demoSite mode [default: disabled]
       --no-rates                     disable fetching of currency exchange rates [default: enabled]
       --privacy-mode                 enable privacyMode to disable external data requests [default: disabled]
+      --max-mem <bytes>              value for max_old_space_size [default: 1024 (1 GB)]
 
       --ganalytics-tracking <tid>    tracking id for google analytics [default: disabled]
       --sentry-url <sentry-url>      sentry url [default: disabled]

bin/www

@@ -1,7 +1,11 @@
 #!/usr/bin/env node
-var debug = require('debug')('my-application');
+var debug = require('debug')('www');
 var app = require('../app');
 
+const v8 = require('v8');
+v8.setFlagsFromString("--max_old_space_size=" + (process.env.BTCEXP_OLD_SPACE_MAX_SIZE || 1024));
+debug(`Set max_old_space_size to ${(process.env.BTCEXP_OLD_SPACE_MAX_SIZE || 1024)} MB`);
+
 app.set('port', process.env.PORT || process.env.BTCEXP_PORT || 3002);
 app.set('host', process.env.BTCEXP_HOST || '127.0.0.1');