[go: up one dir, main page]

tide 0.3.0

Serve the web – HTTP server framework
Documentation 
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

use http::{HeaderMap, Method, Uri, Version};
use http_service::Body;
use route_recognizer::Params;
use std::{str::FromStr, sync::Arc};

/// Data associated with a request-response lifecycle.
///
/// The `Context` gives endpoints access to basic information about the incoming
/// request, route parameters, and various ways of accessing the request's body.
///
/// Contexts also provide *extensions*, a type map primarily used for low-level
/// communication between middleware and endpoints.
#[derive(Debug)]
pub struct Context<State> {
    state: Arc<State>,
    request: http_service::Request,
    route_params: Params,
}

impl<State> Context<State> {
    pub(crate) fn new(
        state: Arc<State>,
        request: http::Request<Body>,
        route_params: Params,
    ) -> Context<State> {
        Context {
            state,
            request,
            route_params,
        }
    }

    /// Access the request's HTTP method.
    pub fn method(&self) -> &Method {
        self.request.method()
    }

    /// Access the request's full URI method.
    pub fn uri(&self) -> &Uri {
        self.request.uri()
    }

    /// Access the request's HTTP version.
    pub fn version(&self) -> Version {
        self.request.version()
    }

    /// Access the request's headers.
    pub fn headers(&self) -> &HeaderMap {
        self.request.headers()
    }

    /// Access the entire request.
    pub fn request(&self) -> &http_service::Request {
        &self.request
    }

    ///  Access app-global data.
    pub fn state(&self) -> &State {
        &self.state
    }

    /// Extract and parse a route parameter by name.
    ///
    /// Returns the results of parsing the parameter according to the inferred
    /// output type `T`.
    ///
    /// The name should *not* include the leading `:` or the trailing `*` (if
    /// any).
    ///
    /// # Errors
    ///
    /// Yields an `Err` if the parameter was found but failed to parse as an
    /// instance of type `T`.
    ///
    /// # Panics
    ///
    /// Panic if `key` is not a parameter for the route.
    pub fn param<T: FromStr>(&self, key: &str) -> Result<T, T::Err> {
        self.route_params.find(key).unwrap().parse()
    }

    /// Reads the entire request body into a byte buffer.
    ///
    /// This method can be called after the body has already been read, but will
    /// produce an empty buffer.
    ///
    /// # Errors
    ///
    /// Any I/O error encountered while reading the body is immediately returned
    /// as an `Err`.
    pub async fn body_bytes(&mut self) -> std::io::Result<Vec<u8>> {
        self.take_body().into_vec().await
    }

    /// Reads the entire request body into a string.
    ///
    /// This method can be called after the body has already been read, but will
    /// produce an empty buffer.
    ///
    /// # Errors
    ///
    /// Any I/O error encountered while reading the body is immediately returned
    /// as an `Err`.
    ///
    /// If the body cannot be interpreted as valid UTF-8, an `Err` is returned.
    pub async fn body_string(&mut self) -> std::io::Result<String> {
        let body_bytes = self.body_bytes().await?;
        Ok(String::from_utf8(body_bytes).map_err(|_| std::io::ErrorKind::InvalidData)?)
    }

    /// Reads and deserialized the entire request body via json.
    ///
    /// # Errors
    ///
    /// Any I/O error encountered while reading the body is immediately returned
    /// as an `Err`.
    ///
    /// If the body cannot be interpreted as valid json for the target type `T`,
    /// an `Err` is returned.
    pub async fn body_json<T: serde::de::DeserializeOwned>(&mut self) -> std::io::Result<T> {
        let body_bytes = self.body_bytes().await?;
        Ok(serde_json::from_slice(&body_bytes).map_err(|_| std::io::ErrorKind::InvalidData)?)
    }

    /// Remove ownership of the request body, replacing it with an empty body.
    ///
    /// Used primarily for working directly with the body stream.
    pub fn take_body(&mut self) -> Body {
        std::mem::replace(self.request.body_mut(), Body::empty())
    }

    /// Access the extensions to the context.
    pub fn extensions(&self) -> &http::Extensions {
        self.request.extensions()
    }

    /// Mutably access the extensions to the context.
    pub fn extensions_mut(&mut self) -> &mut http::Extensions {
        self.request.extensions_mut()
    }
}