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
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
use http::{HeaderMap, Method};
use js_sys::{Promise, JSON};
use std::{fmt, future::Future, sync::Arc};
use url::Url;
use wasm_bindgen::prelude::{wasm_bindgen, UnwrapThrowExt as _};
use super::{AbortGuard, Request, RequestBuilder, Response};
use crate::IntoUrl;
#[wasm_bindgen]
extern "C" {
#[wasm_bindgen(js_name = fetch)]
fn fetch_with_request(input: &web_sys::Request) -> Promise;
}
fn js_fetch(req: &web_sys::Request) -> Promise {
use wasm_bindgen::{JsCast, JsValue};
let global = js_sys::global();
if let Ok(true) = js_sys::Reflect::has(&global, &JsValue::from_str("ServiceWorkerGlobalScope"))
{
global
.unchecked_into::<web_sys::ServiceWorkerGlobalScope>()
.fetch_with_request(req)
} else {
fetch_with_request(req)
}
}
#[derive(Clone)]
pub struct Client {
config: Arc<Config>,
}
pub struct ClientBuilder {
config: Config,
}
impl Client {
pub fn new() -> Self {
Client::builder().build().unwrap_throw()
}
pub fn builder() -> ClientBuilder {
ClientBuilder::new()
}
pub fn get<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::GET, url)
}
pub fn post<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::POST, url)
}
pub fn put<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::PUT, url)
}
pub fn patch<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::PATCH, url)
}
pub fn delete<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::DELETE, url)
}
pub fn head<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::HEAD, url)
}
pub fn request<U: IntoUrl>(&self, method: Method, url: U) -> RequestBuilder {
let req = url.into_url().map(move |url| Request::new(method, url));
RequestBuilder::new(self.clone(), req)
}
pub fn execute(
&self,
request: Request,
) -> impl Future<Output = Result<Response, crate::Error>> {
self.execute_request(request)
}
fn merge_headers(&self, req: &mut Request) {
use http::header::Entry;
let headers: &mut HeaderMap = req.headers_mut();
for (key, value) in self.config.headers.iter() {
if let Entry::Vacant(entry) = headers.entry(key) {
entry.insert(value.clone());
}
}
}
pub(super) fn execute_request(
&self,
mut req: Request,
) -> impl Future<Output = crate::Result<Response>> {
self.merge_headers(&mut req);
fetch(req)
}
}
impl Default for Client {
fn default() -> Self {
Self::new()
}
}
impl fmt::Debug for Client {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut builder = f.debug_struct("Client");
self.config.fmt_fields(&mut builder);
builder.finish()
}
}
impl fmt::Debug for ClientBuilder {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut builder = f.debug_struct("ClientBuilder");
self.config.fmt_fields(&mut builder);
builder.finish()
}
}
async fn fetch(req: Request) -> crate::Result<Response> {
let mut init = web_sys::RequestInit::new();
init.method(req.method().as_str());
let js_headers = web_sys::Headers::new()
.map_err(crate::error::wasm)
.map_err(crate::error::builder)?;
for (name, value) in req.headers() {
js_headers
.append(
name.as_str(),
value.to_str().map_err(crate::error::builder)?,
)
.map_err(crate::error::wasm)
.map_err(crate::error::builder)?;
}
init.headers(&js_headers.into());
if !req.cors {
init.mode(web_sys::RequestMode::NoCors);
}
if let Some(creds) = req.credentials {
init.credentials(creds);
}
if let Some(body) = req.body() {
if !body.is_empty() {
init.body(Some(body.to_js_value()?.as_ref()));
}
}
let abort = AbortGuard::new()?;
init.signal(Some(&abort.signal()));
let js_req = web_sys::Request::new_with_str_and_init(req.url().as_str(), &init)
.map_err(crate::error::wasm)
.map_err(crate::error::builder)?;
let p = js_fetch(&js_req);
let js_resp = super::promise::<web_sys::Response>(p)
.await
.map_err(crate::error::request)?;
let mut resp = http::Response::builder().status(js_resp.status());
let url = Url::parse(&js_resp.url()).expect_throw("url parse");
let js_headers = js_resp.headers();
let js_iter = js_sys::try_iter(&js_headers)
.expect_throw("headers try_iter")
.expect_throw("headers have an iterator");
for item in js_iter {
let item = item.expect_throw("headers iterator doesn't throw");
let serialized_headers: String = JSON::stringify(&item)
.expect_throw("serialized headers")
.into();
let [name, value]: [String; 2] = serde_json::from_str(&serialized_headers)
.expect_throw("deserializable serialized headers");
resp = resp.header(&name, &value);
}
resp.body(js_resp)
.map(|resp| Response::new(resp, url, abort))
.map_err(crate::error::request)
}
impl ClientBuilder {
pub fn new() -> Self {
ClientBuilder {
config: Config::default(),
}
}
pub fn build(mut self) -> Result<Client, crate::Error> {
let config = std::mem::take(&mut self.config);
Ok(Client {
config: Arc::new(config),
})
}
pub fn default_headers(mut self, headers: HeaderMap) -> ClientBuilder {
for (key, value) in headers.iter() {
self.config.headers.insert(key, value.clone());
}
self
}
}
impl Default for ClientBuilder {
fn default() -> Self {
Self::new()
}
}
#[derive(Clone, Debug)]
struct Config {
headers: HeaderMap,
}
impl Default for Config {
fn default() -> Config {
Config {
headers: HeaderMap::new(),
}
}
}
impl Config {
fn fmt_fields(&self, f: &mut fmt::DebugStruct<'_, '_>) {
f.field("default_headers", &self.headers);
}
}
#[cfg(test)]
mod tests {
use wasm_bindgen_test::*;
wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
#[wasm_bindgen_test]
async fn default_headers() {
use crate::header::{HeaderMap, HeaderValue, CONTENT_TYPE};
let mut headers = HeaderMap::new();
headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
headers.insert("x-custom", HeaderValue::from_static("flibbertigibbet"));
let client = crate::Client::builder()
.default_headers(headers)
.build()
.expect("client");
let mut req = client
.get("https://www.example.com")
.build()
.expect("request");
client.merge_headers(&mut req);
let test_headers = req.headers();
assert!(test_headers.get(CONTENT_TYPE).is_some(), "content-type");
assert!(test_headers.get("x-custom").is_some(), "custom header");
assert!(test_headers.get("accept").is_none(), "no accept header");
}
#[wasm_bindgen_test]
async fn default_headers_clone() {
use crate::header::{HeaderMap, HeaderValue, CONTENT_TYPE};
let mut headers = HeaderMap::new();
headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
headers.insert("x-custom", HeaderValue::from_static("flibbertigibbet"));
let client = crate::Client::builder()
.default_headers(headers)
.build()
.expect("client");
let mut req = client
.get("https://www.example.com")
.header(CONTENT_TYPE, "text/plain")
.build()
.expect("request");
client.merge_headers(&mut req);
let headers1 = req.headers();
assert_eq!(
headers1.get(CONTENT_TYPE).unwrap(),
"text/plain",
"request headers override defaults"
);
let mut req2 = client
.get("https://www.example.com/x")
.build()
.expect("req 2");
client.merge_headers(&mut req2);
let headers2 = req2.headers();
assert_eq!(
headers2.get(CONTENT_TYPE).unwrap(),
"application/json",
"request headers don't change client defaults"
);
}
}