Struct netem_trace::model::delay::RepeatedDelayPattern

source ·

pub struct RepeatedDelayPattern {
    pub pattern: VecDeque<Box<dyn DelayTrace>>,
}

Expand description

The model contains an array of delay trace models.

Combines multiple delay trace models into one delay pattern, and repeat the pattern for count times.

Examples

The most common use case is to read from a configuration file and deserialize it into a RepeatedDelayPatternConfig:

let config_file_content = "{\"RepeatedDelayPatternConfig\":{\"pattern\":[{\"StaticDelayConfig\":{\"delay\":{\"secs\":0,\"nanos\":10000000},\"duration\":{\"secs\":1,\"nanos\":0}}},{\"StaticDelayConfig\":{\"delay\":{\"secs\":0,\"nanos\":20000000},\"duration\":{\"secs\":1,\"nanos\":0}}}],\"count\":2}}";
// The content would be "{\"RepeatedDelayPatternConfig\":{\"pattern\":[{\"StaticDelayConfig\":{\"delay\":\"10ms\",\"duration\":\"1s\"}},{\"StaticDelayConfig\":{\"delay\":\"20ms\",\"duration\":\"1s\"}}],\"count\":2}}"
// if the `human` feature is enabled.
let des: Box<dyn DelayTraceConfig> = serde_json::from_str(config_file_content).unwrap();
let mut model = des.into_model();
assert_eq!(
    model.next_delay(),
    Some((Delay::from_millis(10), Duration::from_secs(1)))
);
assert_eq!(
    model.next_delay(),
    Some((Delay::from_millis(20), Duration::from_secs(1)))
);
assert_eq!(
    model.next_delay(),
    Some((Delay::from_millis(10), Duration::from_secs(1)))
);
assert_eq!(
    model.next_delay(),
    Some((Delay::from_millis(20), Duration::from_secs(1)))
);
assert_eq!(model.next_delay(), None);

You can also build manually:

let pat = vec![
    Box::new(
        StaticDelayConfig::new()
            .delay(Delay::from_millis(10))
            .duration(Duration::from_secs(1)),
    ) as Box<dyn DelayTraceConfig>,
    Box::new(
        StaticDelayConfig::new()
            .delay(Delay::from_millis(20))
            .duration(Duration::from_secs(1)),
    ) as Box<dyn DelayTraceConfig>,
];
let ser = Box::new(RepeatedDelayPatternConfig::new().pattern(pat).count(2)) as Box<dyn DelayTraceConfig>;
let ser_str = serde_json::to_string(&ser).unwrap();
let json_str = "{\"RepeatedDelayPatternConfig\":{\"pattern\":[{\"StaticDelayConfig\":{\"delay\":{\"secs\":0,\"nanos\":10000000},\"duration\":{\"secs\":1,\"nanos\":0}}},{\"StaticDelayConfig\":{\"delay\":{\"secs\":0,\"nanos\":20000000},\"duration\":{\"secs\":1,\"nanos\":0}}}],\"count\":2}}";
// The json string would be "{\"RepeatedDelayPatternConfig\":{\"pattern\":[{\"StaticDelayConfig\":{\"delay\":\"10ms\",\"duration\":\"1s\"}},{\"StaticDelayConfig\":{\"delay\":\"20ms\",\"duration\":\"1s\"}}],\"count\":2}}"
// if the `human` feature is enabled.
assert_eq!(ser_str, json_str);