Merge pull request #71 from HyperBrain/function-deploy

Support serverless deploy function

Author: HyperBrain

README.md

@@ -40,6 +40,14 @@ function parameters (memory, etc.) cannot be changed for a deployed version
 by accident, as it can be done with the `$LATEST` qualifier.
 This adds an additional level of stability to your deployment process.
 
+## Deploy a single function
+
+The plugin supports `serverless deploy function` and moves the alias to the
+updated function version. However you must specify the `--force` switch on the
+commandline to enforce Serverless to deploy a new function ZIP regardless, if the
+code has changed or not. This is necessary to prevent setting the alias to a
+version of the function that has been deployed by another developer.
+
 ## Deploy an alias
 
 To deploy an alias to a stage, just add the `--alias` option to `serverless deploy`
@@ -460,6 +468,9 @@ and _serverless.service.provider.deployedAliasTemplates[]_.
 
 ## Version history
 
+* 1.5.0
+  * Support `serverless deploy function` [#29](https://github.com/HyperBrain/serverless-aws-alias/issues/29)
+
 * 1.4.1
   * Fixed crash when using logs --tail
 

index.js

@@ -17,7 +17,8 @@ const BbPromise = require('bluebird')
 		, removeAlias = require('./lib/removeAlias')
 		, logs = require('./lib/logs')
 		, collectUserResources = require('./lib/collectUserResources')
-		, uploadAliasArtifacts = require('./lib/uploadAliasArtifacts');
+		, uploadAliasArtifacts = require('./lib/uploadAliasArtifacts')
+		, updateFunctionAlias = require('./lib/updateFunctionAlias');
 
 class AwsAlias {
 
@@ -66,6 +67,7 @@ class AwsAlias {
 			aliasRestructureStack,
 			stackInformation,
 			uploadAliasArtifacts,
+			updateFunctionAlias,
 			setBucketName,
 			monitorStack
 		);
@@ -120,6 +122,19 @@ class AwsAlias {
 			'after:aws:deploy:deploy:updateStack': () => BbPromise.bind(this)
 				.then(this.updateAliasStack),
 
+			'before:deploy:function:initialize': () => BbPromise.bind(this)
+				.then(this.validate)
+				.then(() => {
+					// Force forced deploy
+					if (!this._options.force) {
+						return BbPromise.reject(new this.serverless.classes.Error("You must deploy single functions using --force with the alias plugin."));
+					}
+					return BbPromise.resolve();
+				}),
+
+			'after:deploy:function:deploy': () => BbPromise.bind(this)
+				.then(this.updateFunctionAlias),
+
 			'after:info:info': () => BbPromise.bind(this)
 				.then(this.validate)
 				.then(this.listAliases),

lib/updateFunctionAlias.js

@@ -0,0 +1,65 @@
+'use strict';
+
+const BbPromise = require("bluebird");
+
+module.exports = {
+
+	updateFunctionAlias() {
+		this._serverless.cli.log('Updating function alias...');
+
+		const func = this.serverless.service.getFunction(this.options.function);
+
+		// Publish the yet deployed $LATEST uploaded by Serverless and label it.
+
+		return BbPromise.try(() => {
+			// Get the hash of the deployed function package
+			const params = {
+				FunctionName: func.name,
+				Qualifier: "$LATEST"
+			};
+
+			return this.provider.request(
+				'Lambda',
+				'getFunction',
+				params,
+				this.options.stage, this.options.region
+			);
+		})
+		.then(result => {
+			// Publish $LATEST
+			const sha256 = result.Configuration.CodeSha256;
+			const params = {
+				FunctionName: func.name,
+				CodeSha256: sha256,
+				Description: "Deployed manually"
+			};
+			return this.provider.request(
+				'Lambda',
+				'publishVersion',
+				params,
+				this.options.stage, this.options.region
+			);
+		})
+		.then(result => {
+			// Label it
+			const version = result.Version;
+			const params = {
+				FunctionName: func.name,
+				Name: this._alias,
+				FunctionVersion: version,
+				Description: 'Deployed manually'
+			};
+			return this.provider.request(
+				'Lambda',
+				'updateAlias',
+				params,
+				this.options.stage, this.options.region
+			);
+		})
+		.then(result => {
+			this.serverless.cli.log(`Successfully updated alias: ${this.options.function}@${this._alias} -> ${result.FunctionVersion}`);
+			return BbPromise.resolve();
+		});
+	}
+
+};