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author | Indrajith K L | 2022-12-03 17:00:20 +0530 |
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committer | Indrajith K L | 2022-12-03 17:00:20 +0530 |
commit | f5c4671bfbad96bf346bd7e9a21fc4317b4959df (patch) | |
tree | 2764fc62da58f2ba8da7ed341643fc359873142f /v_windows/v/old/vlib/vweb/README.md | |
download | cli-tools-windows-master.tar.gz cli-tools-windows-master.tar.bz2 cli-tools-windows-master.zip |
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diff --git a/v_windows/v/old/vlib/vweb/README.md b/v_windows/v/old/vlib/vweb/README.md new file mode 100644 index 0000000..850048c --- /dev/null +++ b/v_windows/v/old/vlib/vweb/README.md @@ -0,0 +1,141 @@ +# vweb - the V Web Server # + +A simple yet powerful web server with built-in routing, parameter handling, +templating, and other features. + +## Alpha level software ## + +Some features may not be complete, and there may still be bugs. However, it is +still a very useful tool. The [gitly](https://gitly.org/) site is based on vweb. + +## Features ## + +- **Very fast** performance of C on the web. +- **Small binary** hello world website is <100 KB. +- **Easy to deploy** just one binary file that also includes all templates. + No need to install any dependencies. +- **Templates are precompiled** all errors are visible at compilation time, + not at runtime. + +There is no formal documentation yet - here is a simple +[example](https://github.com/vlang/v/tree/master/examples/vweb/vweb_example.v) + +There's also the V forum, [vorum](https://github.com/vlang/vorum) + +`vorum.v` contains all GET and POST actions. + +```v ignore +pub fn (app mut App) index() { + posts := app.find_all_posts() + $vweb.html() +} + +// TODO ['/post/:id/:title'] +// TODO `fn (app App) post(id int)` +pub fn (app App) post() { + id := app.get_post_id() + post := app.retrieve_post(id) or { + app.redirect('/') + return + } + comments := app.find_comments(id) + show_form := true + $vweb.html() +} +``` + +`index.html` is an example of the V template language: + +```html +@for post in posts + <div class=post> + <a class=topic href="@post.url">@post.title</a> + <img class=comment-img> + <span class=nr-comments>@post.nr_comments</span> + <span class=time>@post.time</span> + </div> +@end +``` + +`$vweb.html()` compiles an HTML template into V during compilation, +and embeds the resulting code into the current action. + +That means that the template automatically has access to that action's entire environment. + +## Deploying vweb apps ## + +Everything, including HTML templates, is in one binary file. That's all you need to deploy. + +## Getting Started ## + +To start with vweb, you have to import the module `vweb`. After the import, +define a struct to hold vweb.Context (and any other variables your program will +need). + +The web server can be started by calling `vweb.run(&App{}, port)`. + +**Example:** + +```v ignore +import vweb + +struct App { + vweb.Context +} + +fn main() { + vweb.run(&App{}, 8080) +} +``` + +### Defining endpoints ### + +To add endpoints to your web server, you have to extend the `App` struct. +For routing you can either use auto-mapping of function names or specify the path as an attribute. +The function expects a response of the type `vweb.Result`. + +**Example:** + +```v ignore +// This endpoint can be accessed via http://localhost:port/hello +fn (mut app App) hello() vweb.Result { + return app.text('Hello') +} + +// This endpoint can be accessed via http://localhost:port/foo +["/foo"] +fn (mut app App) world() vweb.Result { + return app.text('World') +} +``` + +To create an HTTP POST endpoint, you simply add a `[post]` attribute before the function definition. + +**Example:** + +```v ignore +[post] +fn (mut app App) world() vweb.Result { + return app.text('World') +} +``` + +To pass a parameter to an endpoint, you simply define it inside +an attribute, e. g. `['/hello/:user]`. +After it is defined in the attribute, you have to add it as a function parameter. + +**Example:** + +```v ignore +['/hello/:user'] +fn (mut app App) hello_user(user string) vweb.Result { + return app.text('Hello $user') +} +``` + +You have access to the raw request data such as headers +or the request body by accessing `app` (which is `vweb.Context`). +If you want to read the request body, you can do that by calling `app.req.data`. +To read the request headers, you just call `app.req.header` and access the +header you want, e.g. `app.req.header.get(.content_type)`. See `struct Header` +for all available methods (`v doc net.http Header`). |