Fake data generator (#594)

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>

dev/generator/src/attachments.ts

@@ -0,0 +1,46 @@
+import attachment, { Attachment } from '@anticrm/attachment'
+import { Class, Doc, generateId, Ref, Space, TxOperations } from '@anticrm/core'
+import faker from 'faker'
+import { Client } from 'minio'
+import PDFDocument from 'pdfkit'
+
+export interface AttachmentOptions {
+  min: number
+  max: number
+  deleteFactor: number // 0-100 value, will delete just added attachment, below min with rate
+}
+
+export async function addAttachments<T extends Doc> (options: AttachmentOptions, client: TxOperations, minio: Client, dbName: string, space: Ref<Space>, objectId: Ref<T>, _class: Ref<Class<T>>, collection: string): Promise<void> {
+  const attachmentCount = options.min + faker.datatype.number(options.max)
+  for (let i = 0; i < attachmentCount; i++) {
+    const attachmentId = `candidate-attachment-${generateId()}-${i}` as Ref<Attachment>
+
+    const needDelete = i >= options.min && (faker.datatype.number(100) > options.deleteFactor)
+
+    let bufLen = 0
+    if (!needDelete) {
+      const doc = new PDFDocument()
+      doc
+        .fontSize(16)
+        .text(faker.lorem.paragraph(faker.datatype.number(50)))
+
+      doc.end()
+
+      const buf = doc.read()
+      bufLen = buf.length
+      await minio.putObject(dbName, attachmentId, buf, bufLen, { 'Content-Type': 'application/pdf' })
+    }
+
+    await client.addCollection(attachment.class.Attachment, space, objectId, _class, 'attachments', {
+      name: faker.system.commonFileName('pdf'),
+      file: attachmentId,
+      type: 'application/pdf',
+      size: bufLen,
+      lastModified: faker.date.past().getTime()
+    }, attachmentId)
+
+    if (needDelete) {
+      await client.removeCollection(attachment.class.Attachment, space, attachmentId, objectId, _class, 'attachments')
+    }
+  }
+}