bdrck 0.22.3

Generic common foundational utilities.
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

// Copyright 2015 Axel Rasmussen
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::error::*;
use crate::http::client::AbstractClient;
use crate::http::recording::{RecordedRequest, Recording, RecordingEntry};
use crate::http::types::{HttpData, ResponseMetadata};
use reqwest::Client as InnerClient;
use reqwest::{Request, RequestBuilder, Url};
use serde_json;
use std::collections::VecDeque;
use std::sync::Mutex;

/// TestStubClient provides an HTTP-client-like interface for unit testing.
/// Instead of interacting with real servers, it loads a previously recorded
/// HTTP session and verifies application behavior against it.
pub struct TestStubClient {
    inner: InnerClient,
    recordings: Mutex<VecDeque<Recording>>,
}

impl TestStubClient {
    /// Create a new, empty test stub client.
    pub fn new() -> Self {
        TestStubClient {
            inner: InnerClient::new(),
            recordings: Mutex::new(VecDeque::new()),
        }
    }

    /// Push the given recording (the serialized bytes) into this test stub.
    pub fn push_recording(&self, recording: &[u8]) -> Result<&Self> {
        self.recordings
            .lock()
            .unwrap()
            .push_back(serde_json::from_slice(recording)?);
        Ok(self)
    }
}

impl AbstractClient for TestStubClient {
    fn execute(&self, request: Request) -> Result<(ResponseMetadata, Vec<u8>)> {
        // Get the next RecordingEntry out, and pop empty Recordings (if any).

        let entry: RecordingEntry;
        let pop: bool;
        let mut recordings = self.recordings.lock().unwrap();

        {
            let recording = match recordings.front_mut() {
                None => {
                    panic!("Unexpected call to AbstractClient::execute (no more mock recordings)")
                }
                Some(recording) => recording,
            };
            entry = recording.0.pop_front().unwrap();
            pop = recording.0.is_empty();
        }

        if pop {
            recordings.pop_front();
        }

        // Make sure the request matches what we're expecting.
        let assert_req = RecordedRequest::from(&request);
        assert_eq!(
            entry.req, assert_req,
            "HTTP server expected {:#?}, got {:#?}",
            entry.req, assert_req
        );

        Ok((
            entry.res.metadata,
            match entry.res.body {
                HttpData::Text(text) => text.into_bytes(),
                HttpData::Binary(bytes) => bytes,
            },
        ))
    }

    fn get(&self, url: Url) -> RequestBuilder {
        self.inner.get(url)
    }
    fn post(&self, url: Url) -> RequestBuilder {
        self.inner.post(url)
    }
    fn put(&self, url: Url) -> RequestBuilder {
        self.inner.put(url)
    }
    fn patch(&self, url: Url) -> RequestBuilder {
        self.inner.patch(url)
    }
    fn delete(&self, url: Url) -> RequestBuilder {
        self.inner.delete(url)
    }
    fn head(&self, url: Url) -> RequestBuilder {
        self.inner.head(url)
    }
}

impl Drop for TestStubClient {
    fn drop(&mut self) {
        // Technically it is invalid (gives SIGILL) to panic inside drop(), but
        // users of this struct often don't have access to assert this
        // themselves (because HTTP-related structs often take sole ownership of
        // their AbstractClient). So, print out a warning, and panic anyway.
        //
        // Try to sidestep this problem a bit by skipping this assertion if
        // we're already panicking anyway.
        if !::std::thread::panicking() {
            let empty = self.recordings.lock().unwrap().is_empty();
            if !empty {
                println!(
                    "Test failure / panic: test ended with mock HTTP client recordings still pending"
                );
            }
            assert!(empty);
        }
    }
}