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@ -32,7 +32,7 @@ crystal run src/kemal_sample.cr
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```
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Go to *http://localhost:3000*
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Check [documentation](https://github.com/sdogruyol/kemal/tree/master/docs) or [samples](https://github.com/sdogruyol/kemal/tree/master/samples) for more.
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Check [documentation](https://serdardogruyol.com/kemal) or [samples](https://github.com/sdogruyol/kemal/tree/master/samples) for more.
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# Super Fast <3
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@ -1,33 +0,0 @@
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# Kemal Documentation
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This README includes documentation of Kemal, the Crystal Web Framework.
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## What is Kemal?
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Kemal is a micro web framework written in Crystal language. It's strongly inspired from [Sinatra](www.sinatrarb.com).
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## What is Crystal?
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Crystal is a programming language based on *Ruby* syntax.
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## Advantages of using Kemal
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- Easy to learn and start to develop.
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- Since it's working on LLVM, it's too fast.
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- Easy deployment to *Heroku*.
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## The Name
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Kemal means *Mature, grown up* in Turkish.
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## How to start?
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- [Getting Started Tutorial](./getting_started.md)
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- [Restful Web Services](./rest.md)
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- [Websockets](./websockets.md)
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- [Using Dynamic Views](./views.md)
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- [HTTP Requests and Responses](./http-requests.md)
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- [Serving Static Files](./statics.md)
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- [Serving JSON API](./json.md)
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- [Middlewares](./middlewares.md)
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- [Connecting to Database](./database.md)
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@ -1,11 +0,0 @@
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# Database Connection
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Kemal supports database connection in an easy and extensible way. Kemal uses
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a connection pool to handle all the connections meaning it's scalable by default.
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Currently Kemal supports Postgresql and MySQL with:
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- [kemal-pg](https://github.com/sdogruyol/kemal-pg)
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- [kemal-mysql](https://github.com/sdogruyol/kemal-mysql)
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You can check the relevant repo for samples and more info.
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@ -1,85 +0,0 @@
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# Kemal Tutorial
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## 1. Install Crystal
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```
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brew update
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brew install crystal-lang
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```
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## 2. Installing Kemal
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You should create your application first:
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```
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crystal init app your_app
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cd your_app
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```
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Then add *kemal* to the `shard.yml` file as a dependency.
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```yml
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dependencies:
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kemal:
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github: sdogruyol/kemal
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branch: master
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```
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You should run `shards` to get dependencies:
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```
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shards install
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```
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It will output something like that:
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```
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$ shards install
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Updating https://github.com/sdogruyol/kemal.git
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Installing kemal (master)
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```
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## 3. Include Kemal into your project
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Open `your_app/src/your_app.cr` and require `kemal` to use Kemal.
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```ruby
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require "kemal"
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```
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## 4. Hack your project
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Do some awesome stuff with awesome Kemal.
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```ruby
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get "/" do
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"Hello World!"
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end
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```
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All the code should look like this:
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```ruby
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require "kemal"
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get "/" do
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"Hello World!"
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end
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```
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## 5. Run your awesome web project.
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```
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crystal build --release src/your_app.cr
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./your_app
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```
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You should see some logs like these:
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```
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[development] Kemal is ready to lead at http://0.0.0.0:3000
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2015-12-01 13:47:48 +0200 | 200 | GET / - (666µs)
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2015-12-05 13:47:48 +0200 | 404 | GET /favicon.ico - (14µs)
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```
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Now you can be happy with your new, very fast, readable web project.
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@ -1,39 +0,0 @@
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# HTTP Request / Response Lifecycle
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Accessing the HTTP request/response environment (query params, body, content_type, headers, status_code) is super easy. You can use the environment returned from the block:
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```ruby
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# Matches /hello/kemal
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get "/hello/:name" do |env|
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name = env.params["name"]
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"Hello back to #{name}"
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end
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# Matches /resize?width=200&height=200
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get "/resize" do |env|
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width = env.params["width"]
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height = env.params["height"]
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end
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# Easily access JSON payload from the params.
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# The request content type needs to be application/json
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# The payload
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# {"name": "Serdar", "likes": ["Ruby", "Crystal"]}
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post "/json_params" do |env|
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name = env.params["name"] as String
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likes = env.params["likes"] as Array
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"#{name} likes #{likes.each.join(',')}"
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end
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# Set the content as application/json and return JSON
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get "/user.json" do |env|
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kemal = {name: "Kemal", language: "Crystal"}
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env.content_type = "application/json"
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kemal.to_json
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end
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# Add headers to your response
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get "/headers" do |env|
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env.add_header "Accept-Language", "tr"
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env.add_header "Authorization", "Token 12345"
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end
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16
docs/json.md
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docs/json.md
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# Serving JSON API
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You need to return a ```JSON``` object or need to convert the existing object via `to_json`.
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```ruby
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require "kemal"
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require "json"
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# You can easily access the context and set content_type like 'application/json'.
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# Look how easy to build a JSON serving API.
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get "/" do |env|
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env.content_type = "application/json"
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{name: "Serdar", age: 27}.to_json
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end
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```
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# Middlewares
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## Built-in Middlewares
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Kemal has built-in middlewares for common use cases.
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### HTTP Basic Authorization
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This middleware lets you add HTTP Basic Authorization to your Kemal application.
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You can easily use this middleware with `basic_auth` macro like below.
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```crystal
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require "kemal"
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basic_auth "username", "password"
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get "/" do
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"This won't render without correct username and password."
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end
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```
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## Custom middlewares
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You can create your own middleware by inheriting from ```HTTP::Handler```
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```crystal
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class CustomHandler < HTTP::Handler
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def call(request)
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puts "Doing some custom stuff here"
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call_next request
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end
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end
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Kemal.config.add_handler CustomHandler.new
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```
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25
docs/rest.md
25
docs/rest.md
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# Restful Web Services
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You can handle HTTP methods as easy as writing method names and the route with a code block. Kemal will handle all the hard work.
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```
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get "/" do
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.. show something ..
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end
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post "/" do
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.. create something ..
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end
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put "/" do
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.. replace something ..
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end
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patch "/" do
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.. modify something ..
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end
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delete "/" do
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.. annihilate something ..
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end
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```
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## Static Files
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Kemal has built-in support for serving your static files. You need to put your static files under your ```/public``` directory.
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E.g: A static file like ```/public/index.html``` will be served with the matching route ```/index.html```.
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## Production / Development Mode
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By default Kemal starts in ```development```mode and logs to STDOUT.
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You can use ```production``` mode to redirect the output to a file. By default Kemal logs the output to ```kemal.log```.
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You can start Kemal in production mode by:
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```./your_app -e production```
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# Statics
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Add your files to `public` directory and Kemal will serve these files immediately.
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```
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app/
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src/
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your_app.cr
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public/
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js/
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jquery.js
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your_app.js
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css/
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your_app.css
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index.html
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```
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Open index.html and add
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```html
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<html>
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<head>
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<script src="/js/jquery.js"></script>
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<script src="/js/your_app.js"></script>
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<link rel="stylesheet" href="/css/your_app.css"/>
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</head>
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<body>
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...
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</body>
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</html>
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```
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# Browser Redirect
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Just like other things in `kemal`, browser redirection is super simple as well. Use `environment` variable in defined route's corresponding block and call `redirect` on it.
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```ruby
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# Redirect browser
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get "/logout" do |env|
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# important stuff like clearing session etc.
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redirect "/login" # redirect to /login page
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end
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```
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_Make sure to receive `env` as param in defined route's block or you might end-up having compile-time errors._
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# Custom Public Folder
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Kemal mounts `./public` root path of the project as the default public asset folder. You can change this by using `public_folder`.
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```ruby
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public_folder "path/to/your/folder"
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```
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@ -1,57 +0,0 @@
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# Views
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You can use ERB-like built-in **ECR** views to render files.
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```crystal
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get '/:name' do
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render "views/hello.ecr"
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end
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```
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And you should have an `hello.ecr` view. It will have the same context as the method.
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```erb
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Hello <%= env.params["name"] %>
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```
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## Using Layouts
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You can use **layouts** in Kemal. You should pass a second argument.
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```crystal
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get '/:name' do
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render "views/subview.ecr", "views/layouts/layout.ecr"
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end
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```
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And you should use `content` variable (like `yield` in Rails) in layout file.
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```erb
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<html>
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<head>
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<title><%= $title %></title>
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</head>
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<body>
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<%= content %>
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</body>
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</html>
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```
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## Using Common Paths
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Since Crystal does not allow using variables in macro literals, you need to generate
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another *helper macro* to make the code easier to read and write.
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```crystal
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macro my_renderer(filename)
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render "my/app/view/base/path/#{{{filename}}}.ecr", "my/app/view/base/path/layouts/layout.ecr"
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end
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```
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And now you can use your new renderer.
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```crystal
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get '/:name' do
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my_renderer "subview"
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end
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```
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@ -1,36 +0,0 @@
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# Using Websockets
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Using Websockets is super easy! By nature Websockets are a bit different than standard Http Request/Response lifecycle.
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You can easily create a websocket handler which matches the route of `ws://host:port/route. You can create more than 1 websocket handler
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with different routes.
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```ruby
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ws "/" do |socket|
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end
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ws "/route2" do |socket|
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end
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```
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Let's access the socket and create a simple echo server.
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```ruby
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# Matches "/"
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ws "/" do |socket|
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# Send welcome message to the client
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socket.send "Hello from Kemal!"
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# Handle incoming message and echo back to the client
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socket.on_message do |message|
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socket.send "Echo back from server #{message}"
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end
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# Executes when the client is disconnected. You can do the cleaning up here.
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socket.on_close do
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puts "Closing socket"
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end
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end
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```
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