[backport] Reporting/reveal document bytes (#26667)

x-pack/plugins/reporting/export_types/csv/server/execute_job.js

@@ -70,7 +70,7 @@ function executeJobFn(server) {
     const maxSizeBytes = config.get('xpack.reporting.csv.maxSizeBytes');
     const scroll = config.get('xpack.reporting.csv.scroll');
 
-    const { content, maxSizeReached } = await generateCsv({
+    const { content, maxSizeReached, size } = await generateCsv({
       searchRequest,
       fields,
       formatsMap,
@@ -89,7 +89,8 @@ function executeJobFn(server) {
     return {
       content_type: 'text/csv',
       content,
-      max_size_reached: maxSizeReached
+      max_size_reached: maxSizeReached,
+      size,
     };
   };
 }

x-pack/plugins/reporting/export_types/csv/server/lib/__tests__/max_size_string_builder.js

@@ -63,4 +63,18 @@ describe('MaxSizeStringBuilder', function () {
       expect(builder.getString()).to.be('a');
     });
   });
+
+  describe('getSizeInBytes', function () {
+    it(`should return 0 when no strings have been appended`, function () {
+      const builder = new MaxSizeStringBuilder(100);
+      expect(builder.getSizeInBytes()).to.be(0);
+    });
+
+    it(`should the size in bytes`, function () {
+      const builder = new MaxSizeStringBuilder(100);
+      const stringValue = 'foobar';
+      builder.tryAppend(stringValue);
+      expect(builder.getSizeInBytes()).to.be(stringValue.length);
+    });
+  });
 });

x-pack/plugins/reporting/export_types/csv/server/lib/generate_csv.js

@@ -58,11 +58,13 @@ export function createGenerateCsv(logger) {
     } finally {
       await iterator.return();
     }
+    const size = builder.getSizeInBytes();
+    logger(`finished generating, total size in bytes: ${size}`);
 
-    logger('finished generating');
     return {
       content: builder.getString(),
-      maxSizeReached
+      maxSizeReached,
+      size,
     };
   };
 }

x-pack/plugins/reporting/export_types/csv/server/lib/max_size_string_builder.js

@@ -22,6 +22,10 @@ export class MaxSizeStringBuilder {
     return false;
   }
 
+  getSizeInBytes() {
+    return this._size;
+  }
+
   getString() {
     return this._buffer.slice(0, this._size).toString();
   }

x-pack/plugins/reporting/export_types/png/server/execute_job/index.js

@@ -26,7 +26,8 @@ function executeJobFn(server) {
       }),
       map(buffer => ({
         content_type: 'image/png',
-        content: buffer.toString('base64')
+        content: buffer.toString('base64'),
+        size: buffer.byteLength,
       }))
     );
 

x-pack/plugins/reporting/export_types/printable_pdf/server/execute_job/index.js

@@ -34,7 +34,8 @@ function executeJobFn(server) {
       }),
       map(buffer => ({
         content_type: 'application/pdf',
-        content: buffer.toString('base64')
+        content: buffer.toString('base64'),
+        size: buffer.byteLength,
       }))
     );
 

x-pack/plugins/reporting/public/components/report_info_button.tsx

@@ -126,6 +126,10 @@ export class ReportInfoButton extends Component<Props, State> {
           title: 'Content Type',
           description: get(info, 'output.content_type') || NA,
         },
+        {
+          title: 'Size in Bytes',
+          description: get(info, 'output.size') || NA,
+        },
       ],
       status: [
         {

x-pack/plugins/reporting/public/lib/job_queue_client.ts

@@ -27,7 +27,10 @@ export interface JobInfo {
   jobtype: string;
   created_by: string;
   timeout: number;
-  output: { content_type: string };
+  output: {
+    content_type: string;
+    size: number;
+  };
   process_expiration: string;
   completed_at: string;
   payload: {

x-pack/plugins/reporting/server/lib/esqueue/helpers/create_index.js

@@ -58,6 +58,7 @@ const schema = {
     type: 'object',
     properties: {
       content_type: { type: 'keyword' },
+      size: { type: 'keyword' },
       content: { type: 'object', enabled: false }
     }
   }

x-pack/plugins/reporting/server/lib/esqueue/worker.js

@@ -184,6 +184,7 @@ export class Worker extends events.EventEmitter {
       docOutput.content = output.content;
       docOutput.content_type = output.content_type || unknownMime;
       docOutput.max_size_reached = output.max_size_reached;
+      docOutput.size = output.size;
     } else {
       docOutput.content = output || defaultOutput;
       docOutput.content_type = unknownMime;