Bootstruct

"Routing by structure" - me

To support routes like:

domain.com/
domain.com/foo
domain.com/foo/bar

Structure your folders like:

[app]
	[foo]
		[bar]

NOTE: Square brackets for folders.

To handle requests of different kinds of HTTP verbs, add verb files. add a get.js file for GET requests:

[app]
	get.js
	[foo]
		get.js
		[bar]
			get.js

NOTE: You can use post, put and delete (.js) as well. They are all reserved names for files and folders in Bootstruct.

With Bootstruct you structure your files and folders in a certain way to get a certain behavior.

If you're familiar with express/connect, the equivalent would be:

// express/connect equivalent:
app.get('/', function () {
	// ...
});

app.get('/foo', function () {
	// ...
});

app.get('/foo/bar', function () {
	// ...
});

##Get started 0. Start a new project: Create a folder with a special name.

1. Install Bootstruct:

	$ npm install bootstruct

2. In your project's folder, create a server.js file with the following content:

	var http = require('http');
	var bts  = require('bootstruct');

	http.createServer(bts).listen(1001, '127.0.0.1');

3. Create a folder named app in your project's folder. The name "app" is a must.

4. Inside app, create a file named get.js and make it export a single function that accepts a single argument:

	module.exports = function (io) {
		io.res.end('hello beautiful world');
	};

5. Start your server up:

$ node server.js

**You're now ready for GET requests to yourdomain.com/**

###Example explained

1. If npm install bootstruct means nothing to you, welcome to Node!
2. When Bootstruct is required it initializes and returns a function to the bts variable. We pass this function to be used as the server's callback to run on every incoming request. For every request the callback function gets called with the request and the response as arguments.

		// Pseudo code
		http.createSrever( fn(request, response){...} )

3. When Bootstruct initializes, it looks for a folder named app in your project's folder and parses it.
   Bootstruct counts this folder as your main router or the root-controller that handles all requests.

4. When you've created that get.js file, you've actually binded its exported function to run on HTTP GET requests only. By placing it under the app folder (the root-controller) you make it the handler of all GET requests sent to yourdomain.com/. The function that get.js file exports is called when a GET request is made to yourdomain.com (or '/' in common Nodish). When called, it accepts a single argument (io). This io holds the native request/response as properties:
   io.req
   io.res
   Both by reference, untouched. If you used Node before, the io.res.end part should be very clear now.

5. Your app can now accept requests to '/'.
   You should get hello beautiful world in response.

NOTE: The following is more about file-names, folder-names and folder-structure than code and syntax.

###Reserved Entry Names Bootstruct has a few reserved meaningful names for files and folders (or "entries").

1. app
2. first
3. all
4. verbs
5. get
6. post
7. put
8. delete
9. last

NOTE: We've already covered 5 of them.

These names, when given to an entry (a file or a folder) plays a certain roll in your app's flow.

###app

app is reserved only in your project's folder. The folder named app in project's folder is what Bootstruct creates its root-controller from.

Example structure:

[my_special_project] 
	[app]            ===> root-controller
	server.js
	package.json

###get, post, put, delete

These 4 verb names are reserved for entries that exports functions, like in the get-started example. These are some of the methods a controller can have. For code separation you could use folders with these names as well, just make sure to export your function from an index.js file within.

Example structure:

[app]
	get.js
	[post]
		module.js
		index.js
	put.js
	delete.js

Example file:

module.exports = function (io){
	// do your thing...

	io.res.end();
};

###all all works the same and should also export a function. Controllers run their all method before any kind of verb.

Example structure:

[app]
	all.js
	get.js
	post.js

all.js contents:

module.exports = function (io) {
	io.res.write('from all \n');

	// explained later but might ring a bell
	io.next();
};

get.js contents:

module.exports = function (io) {
	io.res.end('from get');
};

post.js contents:

module.exports = function (io) {
	io.res.end('from post');
};

On a GET request to '/' the response would be:

from all
from get

On a POST request it would be:

from all
from post

The all method runs before any verb does. When you're done in all you use io.next to make Bootstruct call the next method in line: the verb method.

###first & last These, as their names suggest, will be called before and after the all and the verb methods as intuitively expected. first runs before the all.
last runs after the verb.

Example structure:

[app]
	first.js
	all.js
	get.js
	last.js

Export the same function in all files:

module.exports = function (io) {
	console.log(__filename);
	io.next();
};

Your last will run last (of course) so there's no need to call io.next from there. Instead, end the response:

last.js contents:

module.exports = function (io) {
	console.log(__filename);
	io.res.end();
};

On a GET request to '/' you'll get the following logs, in this order: path/.../app/first.js path/.../app/all.js path/.../app/get.js path/.../app/last.js

###verbs For an even better code separation, you could move all of your verbs into a verbs folder.
When you'll have sub-controllers in the same containing folder, adding a verbs folder would be more easy on the eye. verbs is only a namespace for verb files so it should always be a folder.

NOTE: The all method can also be in the verbs folder.

Example structure:

[app]
	[verbs]
		[post]
		[put]
		[get]
		[delete]
		all.js
	[foo]
		...
	[bar]
		...

#Controllers

---

A controller is an object that is parsed out from a folder. You can say it's a kind of a representation of a folder. Folder's entries become controller's sub-controllers and methods. Bootstruct builds its controller objects when it initializes (on require). The Root-Controller (RC) is a javascript object that Bootstruct parses out from the app folder. Let's say that when the app folder is empty - RC is empty:

RC = {} // empty object

and when we create all and get entries inside it:

RC = {
	all: fn
	get: fn
}

Controllers can have sub-controllers as folders can have sub-folders.

Example structure:

[app]
	get.js
	[foo]
		get.js

In a "let's-say" code:

RC = {
	get: fn
	sub_controllers: {
		foo: {
			get: fn
		}
	}
}

NOTE: foo will be parsed as a sub-controller of RC because foo is not a reserved entry name.

If you'd log the current filename in both get.js files:

module.exports = function (io) {
	console.log(__filename);
	io.res.end();
};

and run the following GET requests:

1. /
2. /foo
3. /foo/bar

You should get:

1. .../app/get.js
2. .../app/foo/get.js
3. .../app/foo/get.js

When addressing the root, the RC's get will run. When addressing foo, foo's get will run. When addressing a bar (which doesn't exist), get will run in the last controller found (foo).

IMPORTANT NOTE: The last controller found in the URL parts is the only controller that also runs its all and verb methods. All of its parent-controllers only run their wrapping methods, first and last.

###io.params On request, Bootstruct splits the requested URL (the pathname) by slashes and stores the returned array on the io as io.params.

When request.url is:

/foo/bar/baz

io.params will hold 3 items:

[foo, bar, baz]

NOTE: Bootstruct uses io.params itself so treat io.params as "read-only".

Considering Bootstruct's nature, this is how Bootstruct routes the io through your different folders/controllers structure: It always checks the next item in io.params for a matching controller's name.

Every time an io "checks-in" a controller (with RC as an exception), the controller removes its name from the io.params array. It's always the first item. On foo controller check-in io.params changes: [foo, bar, baz] ===> [bar, baz].
Then the controller (starting with the RC) checks the first item:

• If it has a sub-controller with a matching name (e.g. foo), it will pass the io to that sub-controller for another "check-in".
• if there is no sub-controller with that name (e.g. bar), what's left in io.params is for you to handle as requests' parameters.

Example structure (same as the last one):

[app]
	get.js
	[foo]
		get.js

Run these 2 requests:

1. /bar
2. /foo/bar

You should get:

1. path/.../app/get.js
   Params: [bar]

2. path/.../app/foo/get.js
   Params: [bar]

###io.urlObj The io also holds a urlObj property which is and object, the result of Node's native url.parse() of the current URL.

NOTE: url.parse() returns an object that is similar to the window.location object. It's called with a true flag what makes the query-string parsed as a key-value object.

So when requesting: yourdomain.com?aaa=111&bbb=222

io.urlObj.query equals to:

io.urlObj.query = {
	aaa : 111,
	bbb : 222
}

###io.urlObj.split Bootstruct adds a usefull property to the above io.urlObj. It splits the URL (the pathname) by slashes and stores the returned array as io.urlObj.split.

On request to: yourdomain.com/aaa/bbb

io.urlObj.split equals to:['aaa', 'bbb']

###misc

• io.method - Lowercased request method (e.g. get)
• io.VERB - Uppercased request method (e.g. GET)
• io.ctrl - (internal) The current handler
• io.profiles - (internal) io's state in all controllers

---

#Summary Consider a structure:

[app]
	first.js
	all.js
	get.js
	last.js
	[foo]
		first.js
		all.js
		get.js
		last.js
		[bar]
			first.js
			all.js
			get.js
			last.js

NOTE: This is a full use case. You don't have to use all of the controller's possible methods for every folder.

Consider all of these files contain:

module.exports = function (io) {
	console.log(__filename);
	io.next();
};

All functions logs the filename they're exported from and moves on, except for app/last.js. This is the last method to run so it doesn't need to call io.next. Instead, it should end the response with io.res.end().

The following are examples of requested URLs (GET requests) and their expected logs given the above structure:

url: /
logs: 
    app/first
	app/all
	app/get
	app/last

url: /foo
logs:
    app/first
	app/foo/first
	app/foo/all
	app/foo/get
	app/foo/last
	app/last

url: /foo/bar
logs: 	
    app/first
	app/foo/first
	app/foo/bar/first
	app/foo/bar/all
	app/foo/bar/get
	app/foo/bar/last
	app/foo/last
	app/last

NOTE: Do you see the onion-like layers? me too!

A pseudo javascript object that describes your root-controller for this case would be:

RC = {
	first: fn,
	sub_controllers: {
		foo: {
			first: fn,
			sub_controllers: {
				bar: {
					first: fn,
					sub_controllers: {},
					verbs: {
						all: fn,
						get: fn
					},
					last : fn
				}
			}
			verbs: {
				all: fn,
				get: fn
			},
			last : fn
		}
	},
	verbs: {
		all: fn,
		get: fn
	},
	last : fn
}

##The Shorter Version

This is what happens for every request. Mind the loop:

1. Check-in: Controllers run their first method.
2. Controllers check the next URL part. Is there a matching sub-controller? If so, the controller passes the io to that sub-controller for a check-in. Back to 1.
   If not, current controller is the target-controller. It will run its all method and then its verb method.
3. Check-out: Controllers run their last method.
4. Controllers pass the io back to their parent controller for a check-out. Back to 3.

#Important notes:

• Bootstruct is CaSe-InSeNsItIvE when it comes to URLs and file names.
• Bootstruct ignores trailing slashes in URLs.
• Bootstruct ignores entries that their names start with an underscore and doesn't parse them (e.g. _ignored.js).
• You can use the io to hold different properties throgh its cycle.
• The context of the this keyword inside method functions refers to the current controller object. Each controller has a name (like bar) and a unique ID which is its folder path (e.g. app/foo/bar).
  Try to log this.name and this.id in your different methods.

More to come.

---

#####Questions, suggestions, bugs, hugs, criticism or kudos are all welcome.

taitulism(at)gmail(dot)com

####DISCLAIMER: Bootstruct haven't been tested for production environment. Yet.