1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
//! An HTTP server

use async_std::io;
use async_std::sync::Arc;

use crate::cookies;
use crate::listener::{Listener, ToListener};
use crate::log;
use crate::middleware::{Middleware, Next};
use crate::router::{Router, Selection};
use crate::{Endpoint, Request, Route};
/// An HTTP server.
///
/// Servers are built up as a combination of *state*, *endpoints* and *middleware*:
///
/// - Server state is user-defined, and is provided via the [`Server::with_state`] function. The
/// state is available as a shared reference to all app endpoints.
///
/// - Endpoints provide the actual application-level code corresponding to
/// particular URLs. The [`Server::at`] method creates a new *route* (using
/// standard router syntax), which can then be used to register endpoints
/// for particular HTTP request types.
///
/// - Middleware extends the base Tide framework with additional request or
/// response processing, such as compression, default headers, or logging. To
/// add middleware to an app, use the [`Server::middleware`] method.
#[allow(missing_debug_implementations)]
pub struct Server<State> {
    router: Arc<Router<State>>,
    state: State,
    middleware: Arc<Vec<Arc<dyn Middleware<State>>>>,
}

impl Server<()> {
    /// Create a new Tide server.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # use async_std::task::block_on;
    /// # fn main() -> Result<(), std::io::Error> { block_on(async {
    /// #
    /// let mut app = tide::new();
    /// app.at("/").get(|_| async { Ok("Hello, world!") });
    /// app.listen("127.0.0.1:8080").await?;
    /// #
    /// # Ok(()) }) }
    /// ```
    #[must_use]
    pub fn new() -> Self {
        Self::with_state(())
    }
}

impl Default for Server<()> {
    fn default() -> Self {
        Self::new()
    }
}

impl<State: Clone + Send + Sync + 'static> Server<State> {
    /// Create a new Tide server with shared application scoped state.
    ///
    /// Application scoped state is useful for storing items
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # use async_std::task::block_on;
    /// # fn main() -> Result<(), std::io::Error> { block_on(async {
    /// #
    /// use tide::Request;
    ///
    /// /// The shared application state.
    /// #[derive(Clone)]
    /// struct State {
    ///     name: String,
    /// }
    ///
    /// // Define a new instance of the state.
    /// let state = State {
    ///     name: "Nori".to_string()
    /// };
    ///
    /// // Initialize the application with state.
    /// let mut app = tide::with_state(state);
    /// app.at("/").get(|req: Request<State>| async move {
    ///     Ok(format!("Hello, {}!", &req.state().name))
    /// });
    /// app.listen("127.0.0.1:8080").await?;
    /// #
    /// # Ok(()) }) }
    /// ```
    pub fn with_state(state: State) -> Self {
        let mut server = Self {
            router: Arc::new(Router::new()),
            middleware: Arc::new(vec![]),
            state,
        };
        server.with(cookies::CookiesMiddleware::new());
        #[cfg(feature = "logger")]
        server.with(log::LogMiddleware::new());
        server
    }

    /// Add a new route at the given `path`, relative to root.
    ///
    /// Routing means mapping an HTTP request to an endpoint. Here Tide applies
    /// a "table of contents" approach, which makes it easy to see the overall
    /// app structure. Endpoints are selected solely by the path and HTTP method
    /// of a request: the path determines the resource and the HTTP verb the
    /// respective endpoint of the selected resource. Example:
    ///
    /// ```rust,no_run
    /// # let mut app = tide::Server::new();
    /// app.at("/").get(|_| async { Ok("Hello, world!") });
    /// ```
    ///
    /// A path is comprised of zero or many segments, i.e. non-empty strings
    /// separated by '/'. There are two kinds of segments: concrete and
    /// wildcard. A concrete segment is used to exactly match the respective
    /// part of the path of the incoming request. A wildcard segment on the
    /// other hand extracts and parses the respective part of the path of the
    /// incoming request to pass it along to the endpoint as an argument. A
    /// wildcard segment is written as `:name`, which creates an endpoint
    /// parameter called `name`. It is not possible to define wildcard segments
    /// with different names for otherwise identical paths.
    ///
    /// Alternatively a wildcard definitions can start with a `*`, for example
    /// `*path`, which means that the wildcard will match to the end of given
    /// path, no matter how many segments are left, even nothing.
    ///
    /// The name of the parameter can be omitted to define a path that matches
    /// the required structure, but where the parameters are not required.
    /// `:` will match a segment, and `*` will match an entire path.
    ///
    /// Here are some examples omitting the HTTP verb based endpoint selection:
    ///
    /// ```rust,no_run
    /// # let mut app = tide::Server::new();
    /// app.at("/");
    /// app.at("/hello");
    /// app.at("add_two/:num");
    /// app.at("files/:user/*");
    /// app.at("static/*path");
    /// app.at("static/:context/:");
    /// ```
    ///
    /// There is no fallback route matching, i.e. either a resource is a full
    /// match or not, which means that the order of adding resources has no
    /// effect.
    pub fn at<'a>(&'a mut self, path: &str) -> Route<'a, State> {
        let router = Arc::get_mut(&mut self.router)
            .expect("Registering routes is not possible after the Server has started");
        Route::new(router, path.to_owned())
    }

    /// Add middleware to an application.
    ///
    /// Middleware provides customization of the request/response cycle, such as compression,
    /// logging, or header modification. Middleware is invoked when processing a request, and can
    /// either continue processing (possibly modifying the response) or immediately return a
    /// response. See the [`Middleware`] trait for details.
    ///
    /// Middleware can only be added at the "top level" of an application, and is processed in the
    /// order in which it is applied.
    pub fn with<M>(&mut self, middleware: M) -> &mut Self
    where
        M: Middleware<State>,
    {
        log::trace!("Adding middleware {}", middleware.name());
        let m = Arc::get_mut(&mut self.middleware)
            .expect("Registering middleware is not possible after the Server has started");
        m.push(Arc::new(middleware));
        self
    }

    /// Asynchronously serve the app with the supplied listener. For more details, see [Listener] and [ToListener]
    pub async fn listen<TL: ToListener<State>>(self, listener: TL) -> io::Result<()> {
        listener.to_listener()?.listen(self).await
    }

    /// Respond to a `Request` with a `Response`.
    ///
    /// This method is useful for testing endpoints directly,
    /// or for creating servers over custom transports.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # #[async_std::main]
    /// # async fn main() -> http_types::Result<()> {
    /// #
    /// use tide::http::{Url, Method, Request, Response};
    ///
    /// let mut app = tide::new();
    /// app.at("/").get(|_| async { Ok("hello world") });
    ///
    /// let req = Request::new(Method::Get, Url::parse("https://example.com")?);
    /// let res: Response = app.respond(req).await?;
    ///
    /// assert_eq!(res.status(), 200);
    /// #
    /// # Ok(()) }
    /// ```
    pub async fn respond<R>(&self, req: impl Into<http_types::Request>) -> http_types::Result<R>
    where
        R: From<http_types::Response>,
    {
        let req = req.into();
        let Self {
            router,
            state,
            middleware,
        } = self.clone();

        let method = req.method().to_owned();
        let Selection { endpoint, params } = router.route(&req.url().path(), method);
        let route_params = vec![params];
        let req = Request::new(state, req, route_params);

        let next = Next {
            endpoint,
            next_middleware: &middleware,
        };

        let res = next.run(req).await;
        let res: http_types::Response = res.into();
        Ok(res.into())
    }
}

impl<State: Clone> Clone for Server<State> {
    fn clone(&self) -> Self {
        Self {
            router: self.router.clone(),
            state: self.state.clone(),
            middleware: self.middleware.clone(),
        }
    }
}

#[async_trait::async_trait]
impl<State: Clone + Sync + Send + 'static, InnerState: Clone + Sync + Send + 'static>
    Endpoint<State> for Server<InnerState>
{
    async fn call(&self, req: Request<State>) -> crate::Result {
        let Request {
            req,
            mut route_params,
            ..
        } = req;
        let path = req.url().path().to_owned();
        let method = req.method().to_owned();
        let router = self.router.clone();
        let middleware = self.middleware.clone();
        let state = self.state.clone();

        let Selection { endpoint, params } = router.route(&path, method);
        route_params.push(params);
        let req = Request::new(state, req, route_params);

        let next = Next {
            endpoint,
            next_middleware: &middleware,
        };

        Ok(next.run(req).await)
    }
}

#[cfg(test)]
mod test {
    use crate as tide;

    #[test]
    fn allow_nested_server_with_same_state() {
        let inner = tide::new();
        let mut outer = tide::new();
        outer.at("/foo").get(inner);
    }

    #[test]
    fn allow_nested_server_with_different_state() {
        let inner = tide::with_state(1);
        let mut outer = tide::new();
        outer.at("/foo").get(inner);
    }
}