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assets checker: improve pub struct check (fix checker: improve pub struct check (fix #14446) (#14777)) (checker: improve pub struct check (fix #14446) (#14777)) last Jun 19

vweb - the V Web Server

A simple yet powerful web server with built-in routing, parameter handling, templating, and other features. The gitly site is based on vweb.

Some features may not be complete, and have some bugs.

Features

Examples

There are some examples that can be explored here.

And others like:

Front-end getting start example src/main.v

module main

import vweb
import os

struct App {
    vweb.Context
}

struct Object {
    title       string
    description string
}

fn main() {
    vweb.run_at(new_app(), vweb.RunParams{
        port: 8081
    }) or { panic(err) }
}

fn new_app() &App {
    mut app := &App{}
    // makes all static files available.
    app.mount_static_folder_at(os.resource_abs_path('.'), '/')
    return app
}

['/']
pub fn (mut app App) page_home() vweb.Result {
    // all this constants can be accessed by src/templates/page/home.html file.
    page_title := 'V is the new V'
    v_url := 'https://github.com/vlang/v'

    list_of_object := [
        Object{
            title: 'One good title'
            description: 'this is the first'
        },
        Object{
            title: 'Other good title'
            description: 'more one'
        },
    ]
    // $vweb.html() in `<folder>_<name> vweb.Result ()` like this
    // render the `<name>.html` in folder `./templates/<folder>`
    return $vweb.html()
}

$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.

src/templates/page/home.html

<html>
  <header>
    <title>${page_title}</title>
    @css 'src/templates/page/home.css'
  </header>
  <body>
    <h1 class="title">Hello, Vs.</h1>
    @for var in list_of_object
    <div>
      <a href="${v_url}">${var.title}</a>
      <span>${var.description}</span>
    </div>
    @end
    <div>@include 'component.html'</div>
  </body>
</html>

src/templates/page/component.html

<div>This is a component</div>

src/templates/page/home.css

h1.title {
  font-family: Arial, Helvetica, sans-serif;
  color: #3b7bbf;
}

V suport some Template directives like @css, @js for static files in <path> @if, @for for conditional and loop and @include to include html components.

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 and 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) or vweb.run(&App{}, RunParams)

Example:

import vweb

struct App {
    vweb.Context
}

fn main() {
    vweb.run(&App{}, 8080)
    // // or
    // vweb.run_at(new_app(), vweb.RunParams{
    // 	host: 'localhost'
    // 	port: 8099
    // 	family: .ip
    // }) or { panic(err) }
}

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:

// 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')
}

- HTTP verbs

To use any HTTP verbs (or methods, as they are properly called), such as [post], [get], [put], [patch] or [delete] you can simply add the attribute before the function definition.

Example:

[post]
fn (mut app App) world() vweb.Result {
    return app.text('World')
}

['/product/create'; post]
fn (mut app App) create_product() vweb.Result {
    return app.text('product')
}

- Parameters

Parameters are passed direcly in endpoint route using colon sign : and received using the same name at function 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:

          vvvv
['/hello/:user']            vvvv
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 example. app.req.header.get(.content_type). See struct Header for all available methods (v doc net.http Header). It has, too, fields for the query, form, files.

- Query

To handle the query context, you just need use the query field

Example:

module main

import vweb

struct App {
    vweb.Context
}

fn main() {
    vweb.run(&App{}, 8081)
}

['/user'; get]
pub fn (mut app App) controller_get_user_by_id() vweb.Result {
    // http://localhost:3000/user?q=vpm&order_by=desc => { 'q': 'vpm', 'order_by': 'desc' }
    return app.text(app.query.str())
}

Middleware

V haven't a well defined middleware. For now, you can use before_request(). This method called before every request. Probably you can use it for check user session cookie or add header Example:

pub fn (mut app App) before_request() {
    app.user_id = app.get_cookie('id') or { '0' }
}

Redirect

Used when you want be redirected to an url Examples:

pub fn (mut app App) before_request() {
    app.user_id = app.get_cookie('id') or { app.redirect('/') }
}
['/articles'; get]
pub fn (mut app App) articles() vweb.Result {
    if !app.token {
        app.redirect('/login')
    }
    return app.text("patatoes")
}

Responses

- set_status

Sets the response status Example:

['/user/get_all'; get]
pub fn (mut app App) controller_get_all_user() vweb.Result {
    token := app.get_header('token')

    if !token {
        app.set_status(401, '')
        return app.text('Not valid token')
    }

    response := app.service_get_all_user() or {
        app.set_status(400, '')
        return app.text('$err')
    }
    return app.json(response)
}

- html

Response HTTP_OK with payload with content-type text/html Example:

pub fn (mut app App) html_page() vweb.Result {
    return app.html('<h1>ok</h1>')
}

- text

Response HTTP_OK with payload with content-type text/plain Example:

pub fn (mut app App) simple() vweb.Result {
    return app.text('A simple result')
}

- json

Response HTTP_OK with payload with content-type application/json Examples:

['/articles'; get]
pub fn (mut app App) articles() vweb.Result {
    articles := app.find_all_articles()
    json_result := json.encode(articles)
    return app.json(json_result)
}
['/user/create'; post]
pub fn (mut app App) controller_create_user() vweb.Result {
    body := json.decode(User, app.req.data) or {
        app.set_status(400, '')
        return app.text('Failed to decode json, error: $err')
    }

    response := app.service_add_user(body.username, body.password) or {
        app.set_status(400, '')
        return app.text('error: $err')
    }

    return app.json(response)
}

- json_pretty

Response HTTP_OK with a pretty-printed JSON result Example:

fn (mut app App) time_json_pretty() {
    app.json_pretty({
        'time': time.now().format()
    })
}

- file

Response HTTP_OK with file as payload

- ok

Response HTTP_OK with payload Example:

['/form_echo'; post]
pub fn (mut app App) form_echo() vweb.Result {
    app.set_content_type(app.req.header.get(.content_type) or { '' })
    return app.ok(app.form['foo'])
}

- server_error

Response a server error Example:

fn (mut app App) sse() vweb.Result {
    return app.server_error(501)
}

- not_found

Response HTTP_NOT_FOUND with payload Example:

['/:user/:repo/settings']
pub fn (mut app App) user_repo_settings(username string, repository string) vweb.Result {
    if username !in known_users {
        return app.not_found()
    }
    return app.html('username: $username | repository: $repository')
}

Requests

- get_header

Returns the header data from the key Example:

['/user/get_all'; get]
pub fn (mut app App) controller_get_all_user() vweb.Result {
    token := app.get_header('token')
    return app.text(token)
}

- get_cookie

Sets a cookie Example:

pub fn (mut app App) before_request() {
    app.user_id = app.get_cookie('id') or { '0' }
}

- add_header

Adds an header to the response with key and val Example:

['/upload'; post]
pub fn (mut app App) upload() vweb.Result {
    fdata := app.files['upfile']

    data_rows := fdata[0].data.split('\n')

    mut output_data := ''

    for elem in data_rows {
        delim_row := elem.split('\t')
        output_data += '${delim_row[0]}\t${delim_row[1]}\t'
        output_data += '${delim_row[0].int() + delim_row[1].int()}\n'
    }

    output_data = output_data.all_before_last('\n')

    app.add_header('Content-Disposition', 'attachment; filename=results.txt')
    app.send_response_to_client('application/octet-stream', output_data)

    return $vweb.html()
}

- set_cookie

Sets a cookie Example:

pub fn (mut app App) cookie() vweb.Result {
    app.set_cookie(name: 'cookie', value: 'test')
    return app.text('Response Headers\n$app.header')
}

- set_cookie_with_expire_date

Sets a cookie with a expire_data Example:

pub fn (mut app App) cookie() vweb.Result {
    key := 'cookie'
    value := 'test'
    duration := time.Duration(2 * time.minute ) // add 2 minutes
    expire_date := time.now().add(duration)

    app.set_cookie_with_expire_date(key, value, expire_date)
    return app.text('Response Headers\n$app.header')
}

- set_content_type

Sets the response content type Example:

['/form_echo'; post]
pub fn (mut app App) form_echo() vweb.Result {
    app.set_content_type(app.req.header.get(.content_type) or { '' })
    return app.ok(app.form['foo'])
}

Template

-handle_static

handle_static is used to mark a folder (relative to the current working folder) as one that contains only static resources (css files, images etc).

If root is set the mount path for the dir will be in '/'

Example:

fn main() {
    mut app := &App{}
    app.serve_static('/favicon.ico', 'favicon.ico')
    // Automatically make available known static mime types found in given directory.
    os.chdir(os.dir(os.executable()))?
    app.handle_static('assets', true)
    vweb.run(app, port)
}

-mount_static_folder_at

makes all static files in directory_path and inside it, available at http://server/mount_path.

For example: suppose you have called .mount_static_folder_at('/var/share/myassets', '/assets'), and you have a file /var/share/myassets/main.css . => That file will be available at URL: http://server/assets/main.css .

-serve_static

Serves a file static. url is the access path on the site, file_path is the real path to the file, mime_type is the file type

Example:

fn main() {
    mut app := &App{}
    app.serve_static('/favicon.ico', 'favicon.ico')
    app.mount_static_folder_at(os.resource_abs_path('.'), '/')
    vweb.run(app, 8081)
}

Others

-ip

Returns the ip address from the current user

Example:

pub fn (mut app App) ip() vweb.Result {
    ip := app.ip()
    return app.text('ip: $ip')
}

-error

Set a string to the form error

Example:

pub fn (mut app App) error() vweb.Result {
    app.error('here as an error')
    println(app.form_error) //'vweb error: here as an error'
}