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node-micro-service-bootstrap

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bootstrap for nodejs micro services

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# Micro Service Bootstrap for NodeJS

Microservice Bootstrap as a commandline tool (alternatively, you can also clone from [https://github.com/coreorm/node-micro-service-bootstrap](https://github.com/coreorm/node-micro-service-bootstrap) and add your own service manually).

It takes all the boring chores away, while leaving the fun part to you: the very service / API you wanted.

Heroku App Example: [https://glacial-mountain-78419.herokuapp.com/](https://glacial-mountain-78419.herokuapp.com/).

Example APIs:
- [ping](https://glacial-mountain-78419.herokuapp.com/ping)
- [example: foo](https://glacial-mountain-78419.herokuapp.com/example/foo)
- [example: bar](https://glacial-mountain-78419.herokuapp.com/example/bar)

## Quick start

### Install from NPM

First, install the command
```
npm install -g microservice-bootstrap
```

Then create your web service by running
```
microservice-bootstrap create -t path-to-myservice
```

Then wait patiently, it will install the service and all dependencies (Yes, you don't need to run npm install').

### Create your own service.

Simply run
```
microservice-bootstrap add-service my-service
```

If you want to add more than one, just separate the names with comma (,).
```
microservice-bootstrap add-service service-name1,service-name2...
```

By default, it will expose `GET /my-service` api.

For more details, run `microservice-bootstrap add-service -h`.

### Start the server

`microservice-bootstrap run [options]`

e.g.
```
microservice-bootstrap run -e local -s my-service -v
```

Or run `microservice-bootstrap run -h` to see the man page for more details on the allowed options.

## How-to

### Service How-to

The server is already setup with global `APP` variable, simply do your routes (APP is an instance of express) e.g.

```
APP.get('/', function(req, res) {
    res.send('hello world!');
});
```

If you have added services using the CLI tool, a default GET /[service name] is already added for you.

For more details, check [express](https://expressjs.com/) website.

#### JSON API response maker.

This bootstrap includes a very easy to use JSON response maker, the output format is: 
```
{
  "data": <Object or string>,
  "message": <String message>,
  "success": <Boolean true|false>,
  "code": <INT 200-500>,
  "size": <INT size of data in bytes>,
  "time": <TIMESTAMP milliseconds>
}
```

To use it, simple use the two apis: 
- for successful JSON output: `_LIB.util.response.success(data, message, code)`
- for erroneous JSON output: `_LIB.util.response.error(error, code)`.

Details see [./services/default/index.js](https://github.com/coreorm/node-micro-service-bootstrap/blob/master/services/default/index.js#L52).

### Environment How-to

#### Configuration

Configurations are environment specific, the are located inside ./config folder, the structure is as follows:

```
config
├── local
│   ├── app.js
│   └── lib.js
├── production
│   ├── app.js
│   └── lib.js
└── uat
    ├── app.js
    └── lib.js
```

These 3 environments are pre-installed, if you need to add more environment, just follow the same structure. `[environment name as folder name]/[config file]`
- app.js is the application config;
- lib.js is the library registry;

Config inheritance: `production` -> `uat` -> `local`;

#### Library

Library files should be placed inside ./lib, following the structure:

```
lib
├── README.md
├── package-name         // package
│   ├── file1.js
│   └── file2.js
├── package-name.js      // package header - use it to include package files
```

## Unit Tests

Simple run `npm run test`. All tests are under `./tests` folder. Follow `exampleTest.js` to write your own tests.

### Appendix

#### Globals

| name | description | example/comment |
|---|---|---|
| `_CONF` | configuration object | `_CONF.env` |
|`_PATH_ROOT`|root path| `require(_PATH_ROOT + 'header.js')` |
|`_PATH_LIB`|library path| points to `./lib/` |
| `_LIB` | custom library object | Libraries can be registered in different environments, see *Environment How-to* for more details |
|`_log`|log function| see below logging section |
|`_v`|verbose output function| see below verbose output section |

#### Logging

Use `_log(section, data, level = INFO|ERROR|SUCCESS|...)` to log (this will format it into logstash friendly message structure) 
- section is where your code runs (e.g. 'service:foo', or a filename)
- data can be a simple string, or a complex javascript object.
- level: text value for level of the log

Log format is a custom pattern for logstash, feel free to change it by overriding the custom `global._log` function, or directly update `lib/util/log.js`.

Default GROK syntax: 
```
\[(?<datetime>.+)\] (?<level>[\w]+) "(?<section>[^"]+)" DATA<(?<data>.+)>$
```

#### Verbose output

Simply use `_v(section, data)` to log out the verbose output. This will remain hidden unless the app is run with `-v` or `--verbose`.

#### Built-in Debug tool

NOTE: only supported when _CONF.debug = true;

- `_dump(name, object)` to record objects in the debug information (returned from api)
- `_debug(message)` to record debug messages (returned from api)
- Pass `x-debug-enabled=1` in the header or add `?x-debug-enabled=1` in the query string to enable debug output (NOT supported in production mode).

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