feat: new command template

src/commands/index.ts

@@ -5,6 +5,7 @@ import { lang } from '../lang';
 import { logger, getVersion } from '../common';
 import { validate } from './validate';
 import { deploy } from './deploy';
+import { template } from './template';
 
 const program = new Command();
 
@@ -48,8 +49,17 @@ program
     {},
   )
   .action(async (stackName, { file, parameter, stage }) => {
-    logger.debug('log command info');
     await deploy(stackName, { location: file, parameters: parameter, stage });
   });
 
+program
+  .command('template <stackName>')
+  .description('print ROS template')
+  .option('-f, --file <path>', 'specify the yaml file')
+  .option('-s, --stage <stage>', 'specify the stage')
+  .option('-t, --format <type>', 'output content type (JSON or YAML)', 'JSON')
+  .action((stackName, { format, file, stage }) => {
+    template(stackName, { format, location: file, stage });
+  });
+
 program.parse();

src/commands/template.ts

@@ -0,0 +1,21 @@
+import { TemplateFormat } from '../types';
+import yaml from 'yaml';
+import { generateStackTemplate } from '../stack/deploy';
+import { constructActionContext, logger } from '../common';
+import { parseYaml } from '../stack';
+
+export const template = (
+  stackName: string,
+  options: { format: TemplateFormat; location: string; stage: string | undefined },
+) => {
+  const context = constructActionContext({ ...options, stackName });
+  const iac = parseYaml(context.iacLocation);
+  const { template } = generateStackTemplate(stackName, iac, context);
+
+  const output =
+    options.format === TemplateFormat.JSON
+      ? JSON.stringify(template, null, 2)
+      : yaml.stringify(template);
+
+  logger.info(`\n${output}`);
+};

src/common/actionContext.ts

@@ -23,7 +23,7 @@ export const constructActionContext = (config?: {
     iacLocation: (() => {
       const projectRoot = path.resolve(process.cwd());
       return config?.location
-        ? path.resolve(projectRoot, config?.location)
+        ? path.resolve(projectRoot, config.location)
         : path.resolve(projectRoot, 'serverlessinsight.yml') ||
             path.resolve(projectRoot, 'serverlessInsight.yml') ||
             path.resolve(projectRoot, 'ServerlessInsight.yml') ||

src/stack/deploy.ts

@@ -3,7 +3,11 @@ import { ActionContext, ServerlessIac } from '../types';
 import { logger, rosStackDeploy } from '../common';
 import { IacStack } from './iacStack';
 
-const generateStackTemplate = (stackName: string, iac: ServerlessIac, context: ActionContext) => {
+export const generateStackTemplate = (
+  stackName: string,
+  iac: ServerlessIac,
+  context: ActionContext,
+) => {
   const app = new ros.App();
   new IacStack(app, iac, context);
 

src/types.ts

@@ -79,3 +79,8 @@ export type ActionContext = {
   parameters?: Array<{ key: string; value: string }>;
   tags?: Array<{ key: string; value: string }>;
 };
+
+export enum TemplateFormat {
+  YAML = 'YAML',
+  JSON = 'JSON',
+}

tests/commands/template.test.ts

@@ -0,0 +1,35 @@
+import { template } from '../../src/commands/template';
+import { TemplateFormat } from '../../src/types';
+import { jsonTemplate, yamlTemplate } from '../fixtures/templateFixture';
+
+const mockedLogger = jest.fn();
+jest.mock('../../src/common/logger', () => ({
+  logger: { info: (...args: unknown[]) => mockedLogger(...args), debug: jest.fn() },
+}));
+const stackName = 'printTemplateStack';
+const location = 'tests/fixtures/serverless-insight.yml';
+
+describe('Unit test for template command', () => {
+  beforeEach(() => {
+    mockedLogger.mockRestore();
+  });
+  it('should print the template in JSON format by default', () => {
+    const options = {
+      format: TemplateFormat.JSON,
+      location,
+      stage: undefined,
+    };
+
+    template(stackName, options);
+
+    expect(mockedLogger).toHaveBeenCalledWith(`\n${JSON.stringify(jsonTemplate, null, 2)}`);
+  });
+
+  it('should print the template in YAML format when specified', () => {
+    const options = { format: TemplateFormat.YAML, location, stage: undefined };
+
+    template(stackName, options);
+
+    expect(mockedLogger).toHaveBeenCalledWith(yamlTemplate);
+  });
+});

tests/fixtures/serverless-insight.yml

@@ -26,7 +26,7 @@ functions:
     name: insight-poc-fn
     runtime: nodejs18
     handler: ${vars.handler}
-    code: artifacts/artifact.zip
+    code: tests/fixtures/artifacts/artifact.zip
     memory: 512
     timeout: 10
     environment: