Retry outbound "normal" messages for up to a day

ts/messages/getMessagesById.ts

@@ -0,0 +1,46 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as log from '../logging/log';
+import type { MessageModel } from '../models/messages';
+import type { MessageAttributesType } from '../model-types.d';
+import * as Errors from '../types/errors';
+
+export async function getMessagesById(
+  messageIds: ReadonlyArray<string>
+): Promise<Array<MessageModel>> {
+  const messagesFromMemory: Array<MessageModel> = [];
+  const messageIdsToLookUpInDatabase: Array<string> = [];
+
+  messageIds.forEach(messageId => {
+    const message = window.MessageController.getById(messageId);
+    if (message) {
+      messagesFromMemory.push(message);
+    } else {
+      messageIdsToLookUpInDatabase.push(messageId);
+    }
+  });
+
+  let rawMessagesFromDatabase: Array<MessageAttributesType>;
+  try {
+    rawMessagesFromDatabase = await window.Signal.Data.getMessagesById(
+      messageIdsToLookUpInDatabase
+    );
+  } catch (err: unknown) {
+    log.error(
+      `failed to load ${
+        messageIdsToLookUpInDatabase.length
+      } message(s) from database. ${Errors.toLogFormat(err)}`
+    );
+    return [];
+  }
+
+  const messagesFromDatabase = rawMessagesFromDatabase.map(rawMessage => {
+    // We use `window.Whisper.Message` instead of `MessageModel` here to avoid a circular
+    //   import.
+    const message = new window.Whisper.Message(rawMessage);
+    return window.MessageController.register(message.id, message);
+  });
+
+  return [...messagesFromMemory, ...messagesFromDatabase];
+}