@byndyusoft/casc
v2.0.0
Published
Configuration as Code solution for Node.js (and not just)
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node-casc
Configuration as Code solution for Node.js (and not just) :pencil: :gear:
Introduction
Source code of the microservice and its configuration for different environments must be versioned and deployed from the same commit. This project takes care of generating config from a template and managing values for different environments.
Comparison with Helm
Why don't we just use Helm? Helm is heavily dependent on Kubernetes and this creates problems for various local scripts and migrating applications from Kubernetes to PaaS.
| Feature | Helm | node-casc | | -------------------------------- | ------------ | ------------ | | Container Orchestration Platform | Kubernetes | No limits | | Microservice runtime | No limits | No limits | | Runtime for configuration | No limits | Node.js | | Template language | Go templates | Handlebars | | Output config format | No limits | YAML or JSON | | Support secret variables | Plugin | Built-in | | Cryptography algorithm | No limits | RSA | | Plugins | Yes | No |
Requirements
- Node.js v12 LTS or later
- npm or yarn
Install
npm install @byndyusoft/casc
or
yarn add @byndyusoft/casc
Releases
From releases you can download:
- standalone version for Linux, Alpine, Windows and macOS
- npm package tarball
Quick start
Execute in your terminal to initialize CASC directory:
casc init:dir
By default CASC directory is $(pwd)/.casc
.
CASC directory structure
keys/
- directory with public and private keys for encrypting and decrypting secret values.env
- overridevalues.override.yaml
throughprocess.env
(see dotenv for syntax)config.yaml
- application config (see Handlebars for syntax)settings.yaml
- CASC settingsvalues.yaml
- values forconfig.yaml
values.override.yaml
- overridevalues.yaml
Add files to .gitignore
- your private key
.env
values.override.yaml
config.yaml
Handlebars helpers:
str
- convert value to stringexists
- checks that all values exists
settings.yaml
Default settings:
crypto:
strategy: rsa
privateKey:
format: pkcs8-private-pem
strategies:
file: private.pem
env: CASC_PRIVATE_KEY
publicKey:
format: pkcs8-public-pem
strategies:
file: public.pem
Properties:
crypto.strategy
- asymmetric cryptography algorithm, onlyrsa
supportedprivateKey.format
- private key format,rsa
supports onlypkcs8-private-pem
privateKey.strategies
- key of this object is name of private key reading strategy (the order of the keys depends on the order in which the strategies are applied)
- value of this object is settings for strategy
publicKey.format
- public key format,rsa
supports onlypkcs8-public-pem
publicKey.strategies
- key of this object is name of public key reading strategy (the order of the keys depends on the order in which the strategies are applied)
- value of this object is settings for strategy
file
private or public key reading strategies
Strategy settings are a string or an array of strings, where each item is a path to a private or public key. The first found key will be read. If the path is relative, then it will be relative to the keys/
directory.
env
private key reading strategy
Strategy settings are a string or an array of strings, where each item is a key of process.env
. The first found key will be read.
values.yaml and values.override.yaml
Example structure:
VALUE_NAME:
env_name: some value
other_env_name:
- some host 1
- some host 2
- some host 3
env_name_with_encrypted_value*: 6JM8YlugHyjnzatv/nOB7A==
env_name_with_decrypted_value!: secret value
default: default value if current environment is not found
Only english letters, digits and underscores are allowed in value names and environments. The digits at the beginning is prohibited. Values can only be strings, numbers, booleans, nulls, or their arrays.
Usage
CLI
We do recommend using this project as a CLI in order to avoid inadvertently affecting your application.
Build config
USAGE
$ casc config:build
OPTIONS
-c, --cascDir=cascDir [default: /app/.casc] CASC directory
-e, --env=env (required) environment
-o, --override=override [default: true] override values
-y, --yaml=yaml [default: false] YAML output instead JSON
Init CASC directory
USAGE
$ casc init:dir
OPTIONS
-c, --cascDir=cascDir [default: /app/.casc] CASC directory
Init RSA keys
USAGE
$ casc init:keys:rsa
OPTIONS
-b, --bits=bits [default: 2048] RSA key size in bits
-c, --cascDir=cascDir [default: /app/.casc] CASC directory
-f, --format=(pkcs8-pem) [default: pkcs8-pem] keys format
Decrypt values
USAGE
$ casc values:decrypt
OPTIONS
-c, --cascDir=cascDir [default: /app/.casc] CASC directory
-y, --yaml=yaml [default: true] YAML output instead JSON
Encrypt values
USAGE
$ casc values:encrypt
OPTIONS
-c, --cascDir=cascDir [default: /app/.casc] CASC directory
-y, --yaml=yaml [default: true] YAML output instead JSON
Library
We do not recommend using this project as a library in order to avoid inadvertently affecting your application.
How to build config
import "reflect-metadata";
import {
container,
IConfigBuilder,
IConfigBuilderToken,
IContextBuilder,
IContextBuilderToken,
IValuesReader,
IValuesReaderToken,
} from "@byndyusoft/casc";
const configBuilder = container.resolve<IConfigBuilder>(IConfigBuilderToken);
const contextBuilder = container.resolve<IContextBuilder>(IContextBuilderToken);
const valuesReader = container.resolve<IValuesReader>(IValuesReaderToken);
const config = await configBuilder.build(
await contextBuilder.build(
process.env.NODE_ENV,
await valuesReader.read(true),
),
);
console.log(config);