Read co2 information once at startup (#4352)

* read at startup

* better logs

lib/plugins/sustainable/index.js

@@ -79,7 +79,22 @@ export default class SustainablePlugin extends SitespeedioPlugin {
       DEFAULT_METRICS_PAGE_SUMMARY,
       'sustainable.pageSummary'
     );
+
+    const greenDomainJSONpath = path.join(
+      __dirname,
+      'data',
+      'url2green.json.gz'
+    );
+
+    if (
+      !this.sustainableOptions.disableHosting &&
+      !this.sustainableOptions.useGreenWebHostingAPI
+    ) {
+      log.info('Reading green domain data from disk');
+      this.data = await loadJSON(greenDomainJSONpath);
+    }
   }
+
   async processMessage(message, queue) {
     const make = this.make;
     const aggregator = this.aggregator;
@@ -118,23 +133,21 @@ export default class SustainablePlugin extends SitespeedioPlugin {
       case 'pagexray.run': {
         // We got data for a URL, lets calculate co2, check green servers etc
         const listOfDomains = Object.keys(message.data.domains);
-        const greenDomainJSONpath = path.join(
-          __dirname,
-          'data',
-          'url2green.json.gz'
-        );
 
         let hostingGreenCheck;
         if (this.sustainableOptions.disableHosting === true) {
           hostingGreenCheck = [];
         } else {
-          hostingGreenCheck =
-            this.sustainableOptions.useGreenWebHostingAPI === true
-              ? await hosting.check(listOfDomains, undefined, 'sitespeed.io')
-              : await hosting.check(
-                  listOfDomains,
-                  await loadJSON(greenDomainJSONpath)
-                );
+          if (this.sustainableOptions.useGreenWebHostingAPI === true) {
+            log.info('Fetch hosting information from The Green Web Foundation');
+            hostingGreenCheck = await hosting.check(
+              listOfDomains,
+              undefined,
+              'sitespeed.io'
+            );
+          } else {
+            hostingGreenCheck = await hosting.check(listOfDomains, this.data);
+          }
         }
 
         const configuration = { model: this.sustainableOptions.model };