123 lines
3.5 KiB
Rust
123 lines
3.5 KiB
Rust
use std::collections::{HashMap, HashSet};
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use std::collections::BTreeMap;
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use std::error::Error;
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use serde::{Deserialize, Serialize};
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use chrono::{DateTime, Utc};
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use async_trait::async_trait;
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use crate::traits::{PartialCalendar, CompleteCalendar};
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use crate::calendar::{CalendarId, SupportedComponents, SearchFilter};
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use crate::Item;
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use crate::item::ItemId;
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/// A calendar used by the [`cache`](crate::cache) module
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#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
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pub struct CachedCalendar {
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name: String,
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id: CalendarId,
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supported_components: SupportedComponents,
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items: HashMap<ItemId, Item>,
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deleted_items: BTreeMap<DateTime<Utc>, ItemId>,
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}
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impl CachedCalendar {
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/// Create a new calendar
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pub fn new(name: String, id: CalendarId, supported_components: SupportedComponents) -> Self {
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Self {
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name, id, supported_components,
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items: HashMap::new(),
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deleted_items: BTreeMap::new(),
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}
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}
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/// Returns the list of tasks that this calendar contains
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pub async fn get_tasks(&self) -> HashMap<ItemId, &Item> {
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self.get_tasks_modified_since(None).await
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}
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/// Returns the tasks that have been last-modified after `since`
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pub async fn get_tasks_modified_since(&self, since: Option<DateTime<Utc>>) -> HashMap<ItemId, &Item> {
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self.get_items_modified_since(since, Some(SearchFilter::Tasks)).await
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}
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}
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#[async_trait]
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impl PartialCalendar for CachedCalendar {
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fn name(&self) -> &str {
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&self.name
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}
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fn id(&self) -> &CalendarId {
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&self.id
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}
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fn supported_components(&self) -> SupportedComponents {
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self.supported_components
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}
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fn add_item(&mut self, item: Item) {
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self.items.insert(item.id().clone(), item);
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}
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fn delete_item(&mut self, item_id: &ItemId) -> Result<(), Box<dyn Error>> {
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if let None = self.items.remove(item_id) {
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return Err("This key does not exist.".into());
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}
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self.deleted_items.insert(Utc::now(), item_id.clone());
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Ok(())
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}
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async fn get_items_modified_since(&self, since: Option<DateTime<Utc>>, filter: Option<SearchFilter>) -> HashMap<ItemId, &Item> {
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let filter = filter.unwrap_or_default();
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let mut map = HashMap::new();
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for (_id, item) in &self.items {
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match since {
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None => (),
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Some(since) => if item.last_modified() < since {
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continue;
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},
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}
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match filter {
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SearchFilter::Tasks => {
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if item.is_task() == false {
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continue;
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}
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},
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_ => (),
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}
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map.insert(item.id().clone(), item);
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}
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map
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}
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fn get_item_ids(&mut self) -> HashSet<ItemId> {
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self.items.keys().cloned().collect()
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}
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fn get_item_by_id_mut(&mut self, id: &ItemId) -> Option<&mut Item> {
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self.items.get_mut(id)
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}
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}
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#[async_trait]
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impl CompleteCalendar for CachedCalendar {
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/// Returns the items that have been deleted after `since`
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async fn get_items_deleted_since(&self, since: DateTime<Utc>) -> HashSet<ItemId> {
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self.deleted_items.range(since..)
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.map(|(_key, id)| id.clone())
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.collect()
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}
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/// Returns the list of items that this calendar contains
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async fn get_items(&self) -> HashMap<ItemId, &Item> {
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self.get_items_modified_since(None, None).await
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}
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}
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