Mountain/ApplicationState/Internal/Persistence/MementoLoader/
LoadInitialMementoFromDisk.rs

1#![allow(non_snake_case)]
2
3//! Best-effort synchronous memento loader for `ApplicationState`'s
4//! `default()` path. Failures don't propagate - corrupted files are
5//! backed up, missing directories are created, and an empty map is
6//! returned so initialisation always succeeds.
7
8use std::{collections::HashMap, fs, path::Path};
9
10use serde_json::Value;
11
12use crate::{ApplicationState::Internal::Persistence::MementoLoader::AttemptMementoRecovery, dev_log};
13
14pub fn Fn(StorageFilePath:&Path) -> HashMap<String, Value> {
15	if !StorageFilePath.exists() {
16		dev_log!(
17			"storage",
18			"[MementoLoader] Memento file does not exist: {}",
19			StorageFilePath.display()
20		);
21
22		return HashMap::new();
23	}
24
25	match fs::read_to_string(StorageFilePath) {
26		Ok(Content) => {
27			serde_json::from_str(&Content).unwrap_or_else(|Error| {
28				dev_log!(
29					"storage",
30					"error: [MementoLoader] Failed to parse JSON from '{}': {}. Attempting recovery.",
31					StorageFilePath.display(),
32					Error
33				);
34				AttemptMementoRecovery::Fn(StorageFilePath, &Content);
35				HashMap::new()
36			})
37		},
38
39		Err(Error) => {
40			dev_log!(
41				"storage",
42				"error: [MementoLoader] Failed to read '{}': {}. Attempting recovery.",
43				StorageFilePath.display(),
44				Error
45			);
46
47			if let Some(Parent) = StorageFilePath.parent()
48				&& !Parent.exists()
49				&& let Err(DirError) = fs::create_dir_all(Parent)
50			{
51				dev_log!(
52					"storage",
53					"warn: [MementoLoader] Failed to create directory '{}': {}",
54					Parent.display(),
55					DirError
56				);
57			}
58
59			HashMap::new()
60		},
61	}
62}

Mountain/ApplicationState/Internal/Persistence/MementoLoader/LoadInitialMementoFromDisk.rs

Mountain/ApplicationState/Internal/Persistence/MementoLoader/
LoadInitialMementoFromDisk.rs