ed-journals 0.13.0

Provides models for representing and parsing elite dangerous journal files
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73

use crate::fs::common::LogFile;
use crate::fs::{LogFSError, Unblocker};
use crate::io::{LogIOError, LogPath};
use crate::logs::LogEvent;
use serde::de::DeserializeOwned;
use std::sync::Arc;

/// Holds a [LogFile] which is changed when [NewestFile::maybe_next] is called with a [LogPath]
/// which is newer than the current one. Calling [Iterator::next] on this type will call the inner file or
/// return [None] if the file is not yet loaded.
pub struct NewestFile<R = LogEvent>
where
    R: DeserializeOwned,
{
    current_path: Option<LogPath>,
    current_file: Option<LogFile<R>>,
    unblocker: Arc<dyn Unblocker>,
}

impl NewestFile {
    pub fn new(blocker: impl Into<Arc<dyn Unblocker>>) -> NewestFile<LogEvent> {
        NewestFile::new_typed::<LogEvent>(blocker)
    }

    pub fn new_raw(blocker: impl Into<Arc<dyn Unblocker>>) -> NewestFile<serde_json::Value> {
        NewestFile::new_typed::<serde_json::Value>(blocker)
    }

    pub fn new_typed<R>(blocker: impl Into<Arc<dyn Unblocker>>) -> NewestFile<R>
    where
        R: DeserializeOwned,
    {
        NewestFile {
            current_path: None,
            current_file: None,
            unblocker: blocker.into(),
        }
    }
}

impl<R> NewestFile<R>
where
    R: DeserializeOwned,
{
    /// Checks the provided path with the currently held path, and if the path is newer, open the
    /// file and start reading events from it. Returns `true` if the file was changed.
    pub fn maybe_new(&mut self, path: &LogPath) -> Result<bool, LogFSError> {
        if self.current_path.is_none()
            || self
                .current_path
                .as_ref()
                .is_some_and(|current| path > current)
        {
            self.current_path = Some(path.clone());
            self.current_file = Some(LogFile::new_typed::<R, _>(path, self.unblocker.clone())?);

            return Ok(true);
        }

        Ok(false)
    }
}

impl<R> Iterator for NewestFile<R>
where
    R: DeserializeOwned,
{
    type Item = Result<R, LogIOError>;

    fn next(&mut self) -> Option<Self::Item> {
        self.current_file.as_mut()?.next()
    }
}