[PRM-495] Reverted removal of checkS3Status from services

Author: oliverbeumkes-nhs

services/ehr-repo/src/services/storage/s3.js

@@ -1,5 +1,6 @@
 import { initializeConfig } from '../../config';
 import { Endpoint, S3 } from 'aws-sdk';
+import dayjs from 'dayjs';
 
 const URL_EXPIRY_TIME = 60;
 const CONTENT_TYPE = 'text/xml';
@@ -11,6 +12,24 @@ export default class S3Service {
     this.Bucket = config.awsS3BucketName;
   }
 
+  checkS3Health() {
+    const result = {
+      type: 's3',
+      bucketName: config.awsS3BucketName,
+      available: true,
+      writable: false
+    };
+
+    const date = dayjs().format('YYYY-MM-DD HH:mm:ss');
+    return this._isConnected()
+      .then(() =>
+        this.saveObjectWithName('health-check.txt', date)
+          .then(() => ({ ...result, writable: true }))
+          .catch((err) => ({ ...result, error: err }))
+      )
+      .catch((err) => ({ ...result, error: err, available: false }));
+  }
+
   saveObjectWithName(filename, data) {
     const params = {
       Bucket: config.awsS3BucketName,
@@ -34,6 +53,20 @@ export default class S3Service {
     return this.s3.getSignedUrlPromise(operation, params);
   }
 
+  _isConnected() {
+    return new Promise((resolve, reject) => {
+      this.s3.headBucket(
+        {
+          Bucket: config.awsS3BucketName
+        },
+        (err) => {
+          if (err) reject(err);
+          resolve(true);
+        }
+      );
+    });
+  }
+
   _get_config() {
     if (config.nhsEnvironment === 'local') {
       return {