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use std::ops::Range;
use oorandom::Rand64;
#[derive(Clone, Debug)]
pub struct Block {
pub height: u64,
pub time: u64,
incr: BlockIncrement,
is_frozen: bool
}
#[derive(Clone, Debug)]
enum BlockIncrement {
Random {
height: Range<u64>,
time: Range<u64>
},
Exact {
/// Block height increment
height: u64,
/// Seconds per block increment
time: u64
}
}
impl Block {
/// Will increase the block height by `height` and
/// block time by `height` * `time` for each increment.
///
/// `time` is in seconds.
///
/// This is the default strategy.
pub fn exact_increments(&mut self, height: u64, time: u64) {
assert!(height > 0 && time > 0, "Height and time must be bigger than 0. Call \"freeze\" if you want to stop incrementing blocks.");
self.incr = BlockIncrement::Exact { height, time };
}
/// Will increase the block height by a number within the range of `height` and
/// block time by that same `height` * `time` for each increment.
///
/// `time` is in seconds.
pub fn random_increments(&mut self, height: Range<u64>, time: Range<u64>) {
assert!(height.start > 0 && time.start > 0, "Height and time range start must be bigger than 0.");
self.incr = BlockIncrement::Random { height, time };
}
/// Will stop incrementing blocks on each message execution
/// and calling `next` and `increment` will have no effect.
pub fn freeze(&mut self) {
self.is_frozen = true;
}
/// Will resume incrementing blocks on each message execution.
pub fn unfreeze(&mut self) {
self.is_frozen = false;
}
/// Increments the block height and time by the amount configured - once.
///
/// # Examples
///
/// ```
/// use fadroma::ensemble::Block;
///
/// let mut block = Block::default();
/// block.exact_increments(1, 5);
///
/// let old_height = block.height;
/// let old_time = block.time;
///
/// block.next();
///
/// assert_eq!(block.height - old_height, 1);
/// assert_eq!(block.time - old_time, 5);
///
/// ```
#[inline]
pub fn next(&mut self) {
self.increment(1)
}
///Increments the block height and time by the amount configured, multiplied by the `times` parameter.
///
/// # Examples
///
/// ```
/// use fadroma::ensemble::Block;
///
/// let mut block = Block::default();
/// block.exact_increments(1, 5);
///
/// let old_height = block.height;
/// let old_time = block.time;
///
/// block.increment(3);
///
/// assert_eq!(block.height - old_height, 3);
/// assert_eq!(block.time - old_time, 15);
///
/// ```
pub fn increment(&mut self, times: u64) {
if self.is_frozen {
return;
}
match self.incr.clone() {
BlockIncrement::Exact { height, time } => {
let height = height * times;
self.height += height;
self.time += height * time;
},
BlockIncrement::Random { height, time } => {
// TODO: randomize this seed
let mut rng = Rand64::new(347593485789348572u128);
let rand_height = rng.rand_range(height);
let rand_time = rng.rand_range(time);
let height = rand_height * times;
self.height += height;
self.time += height * rand_time;
}
}
}
}
impl Default for Block {
fn default() -> Self {
Self {
height: 1,
#[cfg(target_arch = "wasm32")]
time: 1600000000,
#[cfg(not(target_arch = "wasm32"))]
time: std::time::SystemTime::now()
.duration_since(std::time::UNIX_EPOCH)
.unwrap()
.as_secs(),
incr: BlockIncrement::Exact {
height: 1,
time: 10
},
is_frozen: false
}
}
}