restcrab 0.2.0

Procedural macro to automatically generate a REST client from a trait definition.
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

use std::str::FromStr;

use snafu::prelude::*;

pub struct Options {
  pub base_url: http::Uri,
}
pub struct Reqwest {
  options: Options,
  client: reqwest_lib::blocking::Client,
}

impl crate::Restcrab for Reqwest {
  type Error = Error;
  type Options = Options;
  type Crab = Reqwest;

  fn options(&self) -> &Self::Options {
    &self.options
  }

  fn options_mut(&mut self) -> &mut Self::Options {
    &mut self.options
  }

  fn from_options(options: Options) -> Result<Reqwest, Error> {
    Ok(Reqwest {
      options,
      client: reqwest_lib::blocking::Client::new(),
    })
  }

  fn call<REQ: serde::Serialize, RES: for<'de> serde::Deserialize<'de>>(&self, request: crate::Request<REQ>) -> Result<Option<RES>, Self::Error> {
    let url: http::Uri = if request.url.host().is_some() && request.url.scheme().is_some() {
      request.url.to_owned()
    } else {
      let mut base_parts = http::uri::Parts::from(self.options.base_url.clone());
      let parts = request.url.to_owned().into_parts();

      if parts.scheme.is_some() {
        base_parts.scheme = parts.scheme;
      }

      if parts.authority.is_some() {
        base_parts.authority = parts.authority;
      }

      if let Some(path_and_query) = parts.path_and_query {
        let mut path = path_and_query.path().to_string();
        if !path.starts_with('/') {
          let base_path = if let Some(path_and_query) = base_parts.path_and_query {
            path_and_query.path().to_owned()
          } else {
            "/".to_string()
          };

          if !path.ends_with('/') {
            path += "/";
          }

          path = base_path + &path;
        }

        base_parts.path_and_query = Some(http::uri::PathAndQuery::from_str(&(path + path_and_query.query().unwrap_or_default())).map_err(|source| Error::ConstructingUrl { source })?);
      }

      http::Uri::from_parts(base_parts)?
    };

    let mut req_builder = match &request.method {
      &http::Method::HEAD => self.client.head(url.to_string()),
      &http::Method::GET => self.client.get(url.to_string()),
      &http::Method::POST => self.client.post(url.to_string()),
      &http::Method::PUT => self.client.put(url.to_string()),
      &http::Method::PATCH => self.client.patch(url.to_string()),
      &http::Method::DELETE => self.client.delete(url.to_string()),
      &http::Method::OPTIONS => self.client.request(reqwest_lib::Method::OPTIONS, url.to_string()),
      &http::Method::CONNECT => self.client.request(reqwest_lib::Method::CONNECT, url.to_string()),
      &http::Method::TRACE => self.client.request(reqwest_lib::Method::TRACE, url.to_string()),
      method => return Err(Error::InvalidMethod { method: method.clone() }),
    };

    for (key, value) in &request.headers {
      req_builder = req_builder.header(key, value);
    }

    req_builder = req_builder.query(&request.queries.iter().collect::<Vec<_>>());

    if let Some(body) = &request.body {
      req_builder = req_builder.body(serde_json::to_string(body).context(SerializingBodySnafu)?);
    }

    let response = req_builder.send().context(SendingRequestSnafu)?;

    ensure!(response.status().is_success(), UnsuccessfulResponseCodeSnafu { response });

    let text = response.text().context(DecodingResponseBodySnafu)?;

    if !text.is_empty() {
      serde_json::from_str::<RES>(text.as_str()).map(Some).context(DeserializingBodySnafu)
    } else {
      Ok(None)
    }
  }
}

#[derive(Debug, snafu::Snafu)]
pub enum Error {
  #[snafu(display("Error parsing url: {source}"), context(false))]
  ParsingUrl { source: http::uri::InvalidUriParts },

  #[snafu(display("Error serializing body: {source}"))]
  SerializingBody { source: serde_json::Error },

  #[snafu(display("Error deserializing body: {source}"))]
  DeserializingBody { source: serde_json::Error },

  #[snafu(display("Error sending request: {source}"))]
  SendingRequest { source: reqwest_lib::Error },

  #[snafu(display("Unsuccessful response code: {response:?}"))]
  UnsuccessfulResponseCode { response: reqwest_lib::blocking::Response },

  #[snafu(display("Error converting response body to text: {source}"))]
  DecodingResponseBody { source: reqwest_lib::Error },

  #[snafu(display("Invalid method: {method}"))]
  InvalidMethod { method: http::Method },

  #[snafu(display("Error constructing url: {source}"))]
  ConstructingUrl { source: http::uri::InvalidUri },

  #[snafu(context(false))]
  Restcrab { source: crate::Error },
}