Deploy Old Versions (#404)

Initial support for restoring old application versions. Redeploys a
previous version with a specified version number. Directly deploys the
original code of that version, so make sure your database schema is what
that version expects!

packages/dbos-cloud/applications/deploy-app-code.ts

@@ -55,7 +55,7 @@ async function createZipData(logger: CLILogger): Promise<string> {
     return buffer.toString('base64');
 }
 
-export async function deployAppCode(host: string, rollback: boolean, verbose: boolean): Promise<number> {
+export async function deployAppCode(host: string, rollback: boolean, previousVersion: string | null, verbose: boolean): Promise<number> {
   const logger = getLogger(verbose);
   logger.debug("Getting cloud credentials...");
   const userCredentials = await getCloudCredentials();
@@ -79,9 +79,15 @@ export async function deployAppCode(host: string, rollback: boolean, verbose: bo
   logger.debug("  ... package-lock.json exists.");
 
   try {
-    logger.debug("Creating application zip ...");
-    const zipData = await createZipData(logger);
-    logger.debug("  ... application zipped.");
+    const body: {application_archive?: string, previous_version?: string} = {}
+    if (previousVersion === null) {
+      logger.debug("Creating application zip ...");
+      body.application_archive = await createZipData(logger);
+      logger.debug("  ... application zipped.");
+    } else {
+      logger.debug(`Restoring previous version ${previousVersion}`);
+      body.previous_version = previousVersion
+    }
 
     // Submit the deploy request
     let url = '';
@@ -94,9 +100,7 @@ export async function deployAppCode(host: string, rollback: boolean, verbose: bo
     logger.info(`Submitting deploy request for ${appName}`)
     const response = await axios.post(
       url,
-      {
-        application_archive: zipData,
-      },
+      body,
       {
         headers: {
           "Content-Type": "application/json",

packages/dbos-cloud/cli.ts

@@ -139,16 +139,17 @@ applicationCommands
   .command('deploy')
   .description('Deploy this application to the cloud and run associated database migration commands')
   .option('--verbose', 'Verbose log of deployment step')
-  .action(async (options: {verbose?: boolean}) => {
-    const exitCode = await deployAppCode(DBOSCloudHost, false, options.verbose ?? false);
+  .option('-p, --previous-version <string>', 'Specify a previous version to restore')
+  .action(async (options: {verbose?: boolean, previousVersion?: string}) => {
+    const exitCode = await deployAppCode(DBOSCloudHost, false, options.previousVersion ?? null, options.verbose ?? false);
     process.exit(exitCode);
   });
 
 applicationCommands
   .command('rollback')
   .description('Deploy this application to the cloud and run associated database rollback commands')
   .action(async () => {
-    const exitCode = await deployAppCode(DBOSCloudHost, true, false);
+    const exitCode = await deployAppCode(DBOSCloudHost, true, null, false);
     process.exit(exitCode);
   });