dyer 3.0.1

dyer is designed for reliable, flexible and fast Request-Response based service, including data processing, web-crawling and so on, providing some friendly, flexible, comprehensive features without compromising speed.
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156

//! the [Client] that asynchronously executes [Request], with specified `connect-timeout`, `read-timeout` and
//! `write-timeout`.
//!
//! Note that polling the `[Request]`s requires `tokio::runtime`.

use crate::component::Body;
use crate::component::{utils, Request, Response};
use crate::request::Exts;
use crate::response::InnerResponse;
use crate::response::MetaResponse;
use bytes::buf::ext::BufExt;
//use futures_executor::block_on;
use futures_util::{future::join_all, Future};
use http::Extensions;
use hyper::client::HttpConnector;
use hyper_timeout::TimeoutConnector;
use hyper_tls::HttpsConnector;
use std::io::{BufReader, Read};
use std::sync::Once;

type MClient = hyper::Client<TimeoutConnector<HttpsConnector<HttpConnector>>>;

// TODO add proxy support
/// Client that take [Request] and execute, return [Response]
///
/// NOTE that not all `content-encoding` supported, it only supports as following
/// - plain-text (not compressed)
/// - gzip
/// - br
/// - deflate
pub struct Client;

impl Client {
    /// new static client
    fn new(con: u64, read: u64, write: u64) -> &'static MClient {
        static INIT: Once = Once::new();
        static mut VAL: Option<MClient> = None;
        unsafe {
            INIT.call_once(|| {
                let https: HttpsConnector<HttpConnector> = HttpsConnector::new();
                let mut conn = hyper_timeout::TimeoutConnector::new(https);
                conn.set_connect_timeout(Some(std::time::Duration::from_secs(con)));
                conn.set_read_timeout(Some(std::time::Duration::from_secs(read)));
                conn.set_write_timeout(Some(std::time::Duration::from_secs(write)));
                let item = hyper::Client::builder().build::<_, hyper::Body>(conn);
                VAL = Some(item);
            });
            VAL.as_ref().unwrap()
        }
    }

    /// this function requires a `hyper::Request` and `hyper::Client` to return the Response
    /// Poll the `Request`, and asynchronously aggregate data from
    /// server.
    pub async fn exec(
        req: hyper::Request<hyper::Body>,
    ) -> Result<(hyper::Response<Body>, f64), Box<dyn std::error::Error>> {
        let client = Client::new(7, 23, 7);
        let tic = utils::now();
        match client.request(req).await {
            Ok(response) => {
                let toc = utils::now();
                let gap = toc - tic;
                let (header, bd) = response.into_parts();
                let bod = hyper::body::aggregate(bd).await;
                match bod {
                    Ok(body) => {
                        //let mut data = Bytes::from(body.bytes());
                        let mut reader = BufReader::new(body.reader());
                        // Response Content
                        let mut data = String::new();
                        //let mut data = Chunk::new();
                        let encodings = header.headers.get("content-encoding");
                        let mut encode = 2;
                        if let Some(t) = encodings {
                            let t = t.to_str().unwrap();
                            if ["gzip", "deflate"].contains(&t) {
                                encode = 0;
                            } else if t == "br" {
                                encode = 1;
                            }
                        }

                        if encode == 0 {
                            let mut gz = flate2::read::GzDecoder::new(reader);
                            gz.read_to_string(&mut data).unwrap();
                            //gz.read(&mut *data).unwrap();
                        } else if encode == 1 {
                            let mut br = brotli2::read::BrotliDecoder::new(reader);
                            br.read_to_string(&mut data).unwrap();
                            //br.read(&mut *data).unwrap();
                        } else {
                            reader.read_to_string(&mut data).unwrap();
                            //reader.read(&mut *data).unwrap();
                        }
                        let body = Body::from(data);
                        let res = hyper::Response::from_parts(header, body);
                        Ok((res, gap))
                    }
                    Err(e) => Err(e.into()),
                }
            }
            Err(e) => {
                log::error!("Failed request ",);
                Err(e.into())
            }
        }
    }

    /// execute only one `Request` for common use.
    pub async fn exec_one(req: Request) -> Result<Response, MetaResponse> {
        let (mta, request, ext_t, ext_p) = req.into();
        let mut mta = MetaResponse::from(mta);
        let response = Client::exec(request).await;
        match response {
            Ok(data) => {
                let (parts, body) = data.0.into_parts();
                let inn = InnerResponse {
                    status: parts.status,
                    version: parts.version,
                    headers: parts.headers,
                    extensions: Exts(ext_t, ext_p, Extensions::new(), parts.extensions),
                };
                mta.info.gap = data.1;
                let ret = Response::from_parts(inn, body, mta);
                Ok(ret)
            }
            Err(_) => Err(mta),
        }
    }

    /// A wrapper of futures's function block_on
    ///
    /// blocking the current thread and execute the future
    ///
    /// NOTE that avoid using this if not necessary
    /// spawn a task or use join_all instead
    ///
    /*
     *pub fn block_exec<F: Future>(f: F) -> F::Output {
     *    block_on(f)
     *}
     */

    /// A wrapper of futures's function join_all
    ///
    /// execute multiple `Request` for common use.
    ///
    pub async fn join_all<I>(i: I) -> Vec<<<I as IntoIterator>::Item as Future>::Output>
    where
        I: IntoIterator,
        I::Item: Future,
    {
        join_all(i).await
    }
}