[7.x] Saved Objects - make import/export stream based (#39674)

src/core/server/saved_objects/export/get_sorted_objects_for_export.test.ts

@@ -19,6 +19,12 @@
 
 import { getSortedObjectsForExport } from './get_sorted_objects_for_export';
 import { SavedObjectsClientMock } from '../service/saved_objects_client.mock';
+import { Readable } from 'stream';
+import { createPromiseFromStreams, createConcatStream } from '../../../../legacy/utils/streams';
+
+async function readStreamToCompletion(stream: Readable) {
+  return createPromiseFromStreams([stream, createConcatStream([])]);
+}
 
 describe('getSortedObjectsForExport()', () => {
   const savedObjectsClient = SavedObjectsClientMock.create();
@@ -59,11 +65,14 @@ describe('getSortedObjectsForExport()', () => {
       per_page: 1,
       page: 0,
     });
-    const response = await getSortedObjectsForExport({
+    const exportStream = await getSortedObjectsForExport({
       savedObjectsClient,
       exportSizeLimit: 500,
       types: ['index-pattern', 'search'],
     });
+
+    const response = await readStreamToCompletion(exportStream);
+
     expect(response).toMatchInlineSnapshot(`
 Array [
   Object {
@@ -169,7 +178,7 @@ Array [
         },
       ],
     });
-    const response = await getSortedObjectsForExport({
+    const exportStream = await getSortedObjectsForExport({
       exportSizeLimit: 10000,
       savedObjectsClient,
       types: ['index-pattern', 'search'],
@@ -184,6 +193,7 @@ Array [
         },
       ],
     });
+    const response = await readStreamToCompletion(exportStream);
     expect(response).toMatchInlineSnapshot(`
 Array [
   Object {
@@ -259,7 +269,7 @@ Array [
         },
       ],
     });
-    const response = await getSortedObjectsForExport({
+    const exportStream = await getSortedObjectsForExport({
       exportSizeLimit: 10000,
       savedObjectsClient,
       types: ['index-pattern', 'search'],
@@ -271,6 +281,7 @@ Array [
       ],
       includeReferencesDeep: true,
     });
+    const response = await readStreamToCompletion(exportStream);
     expect(response).toMatchInlineSnapshot(`
 Array [
   Object {

src/core/server/saved_objects/export/get_sorted_objects_for_export.ts

@@ -18,6 +18,7 @@
  */
 
 import Boom from 'boom';
+import { createListStream } from '../../../../legacy/utils/streams';
 import { SavedObjectsClientContract } from '../';
 import { injectNestedDependencies } from './inject_nested_depdendencies';
 import { sortObjects } from './sort_objects';
@@ -86,9 +87,12 @@ export async function getSortedObjectsForExport({
     savedObjectsClient,
     exportSizeLimit,
   });
-  return sortObjects(
+
+  const exportedObjects = sortObjects(
     includeReferencesDeep
       ? await injectNestedDependencies(objectsToExport, savedObjectsClient)
       : objectsToExport
   );
+
+  return createListStream(exportedObjects);
 }

src/core/server/saved_objects/export/sort_objects.ts

@@ -20,9 +20,9 @@
 import Boom from 'boom';
 import { SavedObject } from '../service/saved_objects_client';
 
-export function sortObjects(savedObjects: SavedObject[]) {
-  const path = new Set();
-  const sorted = new Set();
+export function sortObjects(savedObjects: SavedObject[]): SavedObject[] {
+  const path = new Set<SavedObject>();
+  const sorted = new Set<SavedObject>();
   const objectsByTypeId = new Map(
     savedObjects.map(object => [`${object.type}:${object.id}`, object] as [string, SavedObject])
   );

src/core/server/saved_objects/import/collect_saved_objects.test.ts

@@ -23,6 +23,7 @@ import { collectSavedObjects } from './collect_saved_objects';
 describe('collectSavedObjects()', () => {
   test('collects nothing when stream is empty', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
         this.push(null);
       },
@@ -38,34 +39,9 @@ Object {
 
   test('collects objects from stream', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        this.push('{"foo":true,"type":"a"}');
-        this.push(null);
-      },
-    });
-    const result = await collectSavedObjects({
-      readStream,
-      objectLimit: 1,
-      supportedTypes: ['a'],
-    });
-    expect(result).toMatchInlineSnapshot(`
-Object {
-  "collectedObjects": Array [
-    Object {
-      "foo": true,
-      "migrationVersion": Object {},
-      "type": "a",
-    },
-  ],
-  "errors": Array [],
-}
-`);
-  });
-
-  test('filters out empty lines', async () => {
-    const readStream = new Readable({
-      read() {
-        this.push('{"foo":true,"type":"a"}\n\n');
+        this.push({ foo: true, type: 'a' });
         this.push(null);
       },
     });
@@ -90,9 +66,10 @@ Object {
 
   test('throws error when object limit is reached', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        this.push('{"foo":true,"type":"a"}\n');
-        this.push('{"bar":true,"type":"a"}\n');
+        this.push({ foo: true, type: 'a' });
+        this.push({ bar: true, type: 'a' });
         this.push(null);
       },
     });
@@ -107,9 +84,10 @@ Object {
 
   test('unsupported types return as import errors', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        this.push('{"id":"1","type":"a","attributes":{"title":"my title"}}\n');
-        this.push('{"id":"2","type":"b","attributes":{"title":"my title 2"}}\n');
+        this.push({ id: '1', type: 'a', attributes: { title: 'my title' } });
+        this.push({ id: '2', type: 'b', attributes: { title: 'my title 2' } });
         this.push(null);
       },
     });
@@ -141,9 +119,10 @@ Object {
 
   test('unsupported types still count towards object limit', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        this.push('{"foo":true,"type":"a"}\n');
-        this.push('{"bar":true,"type":"b"}\n');
+        this.push({ foo: true, type: 'a' });
+        this.push({ bar: true, type: 'b' });
         this.push(null);
       },
     });

src/core/server/saved_objects/import/collect_saved_objects.ts

@@ -23,7 +23,6 @@ import {
   createFilterStream,
   createMapStream,
   createPromiseFromStreams,
-  createSplitStream,
 } from '../../../../legacy/utils/streams';
 import { SavedObject } from '../service';
 import { createLimitStream } from './create_limit_stream';
@@ -45,13 +44,6 @@ export async function collectSavedObjects({
   const errors: ImportError[] = [];
   const collectedObjects: SavedObject[] = await createPromiseFromStreams([
     readStream,
-    createSplitStream('\n'),
-    createMapStream((str: string) => {
-      if (str && str !== '') {
-        return JSON.parse(str);
-      }
-    }),
-    createFilterStream<SavedObject>(obj => !!obj),
     createLimitStream(objectLimit),
     createFilterStream<SavedObject>(obj => {
       if (supportedTypes.includes(obj.type)) {

src/core/server/saved_objects/import/import_saved_objects.test.ts

@@ -73,6 +73,7 @@ describe('importSavedObjects()', () => {
 
   test('returns early when no objects exist', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
         this.push(null);
       },
@@ -94,8 +95,9 @@ Object {
 
   test('calls bulkCreate without overwrite', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        savedObjects.forEach(obj => this.push(JSON.stringify(obj) + '\n'));
+        savedObjects.forEach(obj => this.push(obj));
         this.push(null);
       },
     });
@@ -175,8 +177,9 @@ Object {
 
   test('calls bulkCreate with overwrite', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        savedObjects.forEach(obj => this.push(JSON.stringify(obj) + '\n'));
+        savedObjects.forEach(obj => this.push(obj));
         this.push(null);
       },
     });
@@ -256,8 +259,9 @@ Object {
 
   test('extracts errors for conflicts', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        savedObjects.forEach(obj => this.push(JSON.stringify(obj) + '\n'));
+        savedObjects.forEach(obj => this.push(obj));
         this.push(null);
       },
     });
@@ -323,39 +327,36 @@ Object {
 
   test('validates references', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        this.push(
-          JSON.stringify({
-            id: '1',
-            type: 'search',
-            attributes: {
-              title: 'My Search',
+        this.push({
+          id: '1',
+          type: 'search',
+          attributes: {
+            title: 'My Search',
+          },
+          references: [
+            {
+              name: 'ref_0',
+              type: 'index-pattern',
+              id: '2',
             },
-            references: [
-              {
-                name: 'ref_0',
-                type: 'index-pattern',
-                id: '2',
-              },
-            ],
-          }) + '\n'
-        );
-        this.push(
-          JSON.stringify({
-            id: '3',
-            type: 'visualization',
-            attributes: {
-              title: 'My Visualization',
+          ],
+        });
+        this.push({
+          id: '3',
+          type: 'visualization',
+          attributes: {
+            title: 'My Visualization',
+          },
+          references: [
+            {
+              name: 'ref_0',
+              type: 'search',
+              id: '1',
             },
-            references: [
-              {
-                name: 'ref_0',
-                type: 'search',
-                id: '1',
-              },
-            ],
-          }) + '\n'
-        );
+          ],
+        });
         this.push(null);
       },
     });
@@ -433,9 +434,10 @@ Object {
 
   test('validates supported types', async () => {
     const readStream = new Readable({
+      objectMode: true,
       read() {
-        savedObjects.forEach(obj => this.push(JSON.stringify(obj) + '\n'));
-        this.push('{"id":"1","type":"wigwags","attributes":{"title":"my title"},"references":[]}');
+        savedObjects.forEach(obj => this.push(obj));
+        this.push({ id: '1', type: 'wigwags', attributes: { title: 'my title' }, references: [] });
         this.push(null);
       },
     });