Differential D7797 Diff 27194 keyserver/src/updaters/olm-session-updater.js

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keyserver/src/updaters/olm-session-updater.js

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				// @flow

				import type { EncryptResult } from '@commapp/olm';

				import { ServerError } from 'lib/utils/errors.js';
				import sleep from 'lib/utils/sleep.js';

				import { fetchOlmAccount } from './olm-account-updater.js';
				import { SQL, dbQuery } from '../database/database.js';
				import { unpickleOlmSession } from '../utils/olm-utils.js';

				const maxOlmSessionUpdateAttemptTime = 30000;
				const olmSessionUpdateRetryDelay = 50;

				async function encryptAndUpdateOlmSession(
				cookieID: string,
				olmSessionType: 'content' \| 'notifications',
				messagesToEncrypt: $ReadOnly<{ [string]: string }>,
				): Promise<{ [string]: EncryptResult }> {
				const isContent = olmSessionType === 'content';
				const { picklingKey } = await fetchOlmAccount(olmSessionType);
				const olmUpdateAttemptStartTime = Date.now();

				while (
				Date.now() - olmUpdateAttemptStartTime <
				maxOlmSessionUpdateAttemptTime
				) {
				const [olmSessionResult] = await dbQuery(
				SQL`
				SELECT version, pickled_olm_session
				FROM olm_sessions
				WHERE cookie_id = ${cookieID} AND is_content = ${isContent}
				`,
				);

				if (olmSessionResult.length === 0) {
				throw new ServerError('missing_olm_session');
				}

				const [{ version, pickled_olm_session: pickledSession }] = olmSessionResult;
				const session = await unpickleOlmSession(pickledSession, picklingKey);

				const encryptedMessages = {};
				for (const messageName in messagesToEncrypt) {
				encryptedMessages[messageName] = session.encrypt(
				messagesToEncrypt[messageName],
				);
				}

				const updatedSession = session.pickle(picklingKey);

				const [transactionResult] = await dbQuery(
				SQL`
				START TRANSACTION;

				SELECT version INTO @currentVersion
				FROM olm_sessions
				WHERE cookie_id = ${cookieID} AND is_content = ${isContent}
				FOR UPDATE;

				UPDATE olm_sessions
				SET
				pickled_olm_session = ${updatedSession},
				version = ${version} + 1
				WHERE version = ${version} AND is_content = ${isContent}
				AND cookie_id = ${cookieID};

				COMMIT;

				SELECT @currentVersion AS versionOnUpdateAttempt;
				`,
				{ multipleStatements: true },
				);

				const selectResult = transactionResult.pop();
				const [{ versionOnUpdateAttempt }] = selectResult;

				if (version === versionOnUpdateAttempt) {
				return encryptedMessages;
				}

				await sleep(olmSessionUpdateRetryDelay);
				}

				throw new ServerError('max_olm_account_update_retry_exceeded');
				}

				export { encryptAndUpdateOlmSession };