About docs.rs Privacy policy Build queue 
  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

use std::cmp::min;
use std::collections::VecDeque;

use tempest_source::prelude::*;

static TARGET_SOURCE: &'static str = "source::MockSource";

pub mod prelude {
    pub use super::{MockSource, MockSourceBuilder, MockSourceOptions};
}

/// Mock source builder for constructing a simple source
/// for testing topologies
#[derive(Default)]
pub struct MockSourceBuilder {
    options: MockSourceOptions,
}

impl MockSourceBuilder {
    pub fn read_msg_count(mut self, count: usize) -> Self {
        self.options.read_msg_count = Some(count);
        self
    }

    pub fn poll_interval(mut self, ms: u64) -> Self {
        self.options.poll_interval = Some(SourceInterval::Millisecond(ms));
        self
    }

    pub fn ack_policy(mut self, policy: SourceAckPolicy) -> Self {
        self.options.ack_policy = Some(policy);
        self
    }

    pub fn max_backoff(mut self, ms: u64) -> Self {
        self.options.max_backoff = Some(ms);
        self
    }

    /// Prime takes a closure which is called to push messages into
    /// the mock source queue.
    pub fn prime(mut self, f: fn(mock: &mut MockSource)) -> Self {
        self.options.prime = Some(f);
        self
    }
}

impl SourceBuilder for MockSourceBuilder {
    type Source = MockSource;

    fn build(&self) -> Self::Source {
        let mut source = Self::Source::default();
        source.options = self.options.clone();
        source
    }
}

#[derive(Clone)]
pub struct MockSourceOptions {
    ack_policy: Option<SourceAckPolicy>,
    ack_interval: Option<SourceInterval>,
    read_msg_count: Option<usize>,
    poll_interval: Option<SourceInterval>,
    max_backoff: Option<u64>,
    prime: Option<fn(mock: &mut MockSource)>,
}

impl Default for MockSourceOptions {
    fn default() -> Self {
        MockSourceOptions {
            read_msg_count: Some(10usize),
            poll_interval: Some(SourceInterval::Millisecond(1u64)),
            ack_policy: Some(SourceAckPolicy::Batch(10)),
            ack_interval: Some(SourceInterval::Millisecond(100u64)),
            max_backoff: Some(1000u64),
            prime: None,
        }
    }
}

/// A  mock source which should be used for testing purposes.
/// This source mocks pushing & polling messages from a queue.
pub struct MockSource {
    options: MockSourceOptions,
    pub queue: VecDeque<SourceMsg>,
    acked: usize,
}

impl Default for MockSource {
    fn default() -> Self {
        MockSource {
            options: MockSourceOptions::default(),
            queue: VecDeque::new(),
            acked: 0,
        }
    }
}

impl MockSource {
    fn read(&mut self) -> SourcePollResult {
        let count = self.options.read_msg_count.as_ref().unwrap();
        let len = self.queue.len();
        if len > 0 {
            let msgs = self
                .queue
                .drain(..min(len, *count))
                .collect::<Vec<SourceMsg>>();
            if msgs.len() > 0 {
                Ok(Some(msgs))
            } else {
                Ok(None)
            }
        } else {
            Ok(None)
        }
    }
}

impl Source for MockSource {
    fn name(&self) -> &'static str {
        "MockSource"
    }

    fn setup(&mut self) -> SourceResult<()> {
        match self.options.prime {
            Some(f) => f(self),
            None => {}
        }
        Ok(())
    }

    fn ack(&mut self, _msg_id: MsgId) -> SourceResult<(i32, i32)> {
        self.acked += 1;
        Ok((1, 1))
    }

    fn batch_ack(&mut self, msgs: Vec<MsgId>) -> SourceResult<(i32, i32)> {
        self.acked += msgs.len();
        trace!(target: TARGET_SOURCE, "acked total: {}", &self.acked);
        Ok((msgs.len() as i32, msgs.len() as i32))
    }

    fn max_backoff(&self) -> SourceResult<&u64> {
        match &self.options.max_backoff {
            Some(v) => Ok(v),
            None => Source::max_backoff(self),
        }
    }

    fn ack_policy(&self) -> SourceResult<&SourceAckPolicy> {
        match &self.options.ack_policy {
            Some(v) => Ok(v),
            None => Source::ack_policy(self),
        }
    }

    fn ack_interval(&self) -> SourceResult<&SourceInterval> {
        match self.options.ack_interval {
            Some(ref v) => Ok(v),
            None => Source::ack_interval(self),
        }
    }

    fn poll_interval(&self) -> SourceResult<&SourceInterval> {
        match self.options.poll_interval {
            Some(ref v) => Ok(v),
            None => Source::poll_interval(self),
        }
    }

    fn poll(&mut self) -> SourcePollResult {
        self.read()
    }
}