45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
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use serde::{Deserialize, Serialize};
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use std::{collections::HashMap, ops::Deref};
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/// A struct to keep track of historical changes to a value.
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/// This struct represents a value that has a current state and a history of previous states.
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct Historic<T> {
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/// The current value
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pub current: T,
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/// A map of timestamps (RFC 3339) to historical values.
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pub changes: HashMap<String, T>,
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}
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impl<T: Clone + std::cmp::PartialEq> Historic<T> {
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/// Create a new value with tracked history
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pub fn new(value: T) -> Historic<T> {
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let mut changes = HashMap::new();
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changes.insert(chrono::Utc::now().to_rfc3339(), value.clone());
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Self {
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current: value,
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changes,
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}
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}
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/// Update the value. The change will be recorded.
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pub fn update(&mut self, value: T) {
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if self.current == value {
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return;
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}
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self.changes
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.insert(chrono::Utc::now().to_rfc3339(), value.clone());
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self.current = value;
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}
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}
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impl<T> Deref for Historic<T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&self.current
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}
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}
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