make loki_message_api::sendMessage use async/await

js/modules/loki_message_api.js

@@ -19,7 +19,7 @@ function initialize({ url }) {
       sendMessage
     };
 
-    function sendMessage(pub_key, data, ttl)
+    async function sendMessage(pub_key, data, ttl)
     {
       const options = {
         url: `${url}/send_message`,
@@ -28,8 +28,6 @@ function initialize({ url }) {
         timeout: undefined
       };
         
-      return new Promise((resolve, reject) => {
-        
       log.info(options.type, options.url);
       
       const body = JSON.stringify({
@@ -47,40 +45,38 @@ function initialize({ url }) {
 
       fetchOptions.headers['Content-Type'] = 'application/json; charset=utf-8';
 
-        fetch(options.url, fetchOptions)
+      let response;
-          .then(response => {
+      try {
-            let resultPromise;
+        response = await fetch(options.url, fetchOptions);
+      }
+      catch(e) {
+        log.error(options.type, options.url, 0, 'Error');
+        throw HTTPError('fetch error', 0, e.toString());
+      }
+
+      let result;
       if (
         options.responseType === 'json' &&
         response.headers.get('Content-Type') === 'application/json'
       ) {
-              resultPromise = response.json();
+        result = await response.json();
       } else if (options.responseType === 'arraybuffer') {
-              resultPromise = response.buffer();
+        result = await response.buffer();
       } else {
-              resultPromise = response.text();
+        result = await response.text();
       }
-            return resultPromise.then(result => {
+
       if (response.status >= 0 && response.status < 400) {
         log.info(options.type, options.url, response.status, 'Success');
-                resolve(result, response.status);
+        return [result, response.status];
       } else {
         log.error(options.type, options.url, response.status, 'Error');
-                reject(
+        throw HTTPError(
-                  HTTPError(
+          'sendMessage: error response',
-                    'promiseAjax: error response',
           response.status,
           result
-                  )
         );
       }
-            });
-          })
-          .catch(e => {
-            log.error(options.type, options.url, 0, 'Error');
-            reject(HTTPError('promiseAjax catch', 0, e.toString()));
-          });
-      });
     }
   }
 }