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

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

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

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