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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151

use std::time::Duration;

use either::Either;
use futures::{future::BoxFuture, stream::BoxStream, FutureExt, Stream, StreamExt};
use libipld::Cid;
use libp2p::PeerId;
use rust_unixfs::walk::{ContinuedWalk, Walker};
use tracing::{Instrument, Span};

use crate::{dag::IpldDag, repo::Repo, Ipfs, IpfsPath};

#[derive(Debug)]
pub enum NodeItem {
    Error { error: anyhow::Error },
    RootDirectory { cid: Cid, path: String },
    Directory { cid: Cid, path: String },
    File { cid: Cid, file: String, size: usize },
}

pub fn ls<'a>(
    which: Either<&Ipfs, &Repo>,
    path: IpfsPath,
    providers: &'a [PeerId],
    local_only: bool,
    timeout: Option<Duration>,
) -> UnixfsLs<'a> {
    let (repo, dag, session) = match which {
        Either::Left(ipfs) => (
            ipfs.repo().clone(),
            ipfs.dag(),
            Some(crate::BITSWAP_ID.fetch_add(1, std::sync::atomic::Ordering::SeqCst)),
        ),
        Either::Right(repo) => {
            let session = repo
                .is_online()
                .then_some(crate::BITSWAP_ID.fetch_add(1, std::sync::atomic::Ordering::SeqCst));
            (repo.clone(), IpldDag::from(repo.clone()), session)
        }
    };

    let stream = async_stream::stream! {

        let resolved = match dag
            .resolve_with_session(session, path.clone(), true, providers, local_only, timeout)
            .await {
                Ok((resolved, _)) => resolved,
                Err(e) => {
                    yield NodeItem::Error { error: e.into() };
                    return;
                }
            };

        let block = match resolved.into_unixfs_block() {
            Ok(block) => block,
            Err(e) => {
                yield NodeItem::Error { error: e.into() };
                return;
            }
        };

        let cid = block.cid();
        let root_name = cid.to_string();

        let mut walker = Walker::new(*cid, root_name);
        let mut cache = None;
        let mut root_directory = String::new();
        while walker.should_continue() {
            let (next, _) = walker.pending_links();
            let block = match repo.get_block_with_session(session, next, providers, local_only, timeout).await {
                Ok(block) => block,
                Err(error) => {
                    yield NodeItem::Error { error };
                    return;
                }
            };
            let block_data = block.data();

            match walker.next(block_data, &mut cache) {
                Ok(ContinuedWalk::Bucket(..)) => {}
                Ok(ContinuedWalk::File(_, cid, path, _, size)) => {
                    let file = path.to_string_lossy().to_string().replace(&format!("{root_directory}/"), "");
                    yield NodeItem::File { cid: *cid, file, size: size as _ };
                },
                Ok(ContinuedWalk::RootDirectory( cid, path, _)) => {
                    let path = path.to_string_lossy().to_string();
                    root_directory = path.clone();
                    yield NodeItem::RootDirectory { cid: *cid, path };
                }
                Ok(ContinuedWalk::Directory( cid, path, _)) => {
                    let path = path.to_string_lossy().to_string().replace(&format!("{root_directory}/"), "");
                    yield NodeItem::Directory { cid: *cid, path };
                }
                Ok(ContinuedWalk::Symlink( .. )) => {},
                Err(error) => {
                    yield NodeItem::Error { error: anyhow::anyhow!("{error}") };
                    return;
                }
            };
        };

    };

    UnixfsLs {
        stream: stream.boxed(),
        span: None,
    }
}

pub struct UnixfsLs<'a> {
    stream: BoxStream<'a, NodeItem>,
    span: Option<Span>,
}

impl<'a> UnixfsLs<'a> {
    pub fn span(mut self, span: Span) -> Self {
        self.span = Some(span);
        self
    }
}

impl<'a> Stream for UnixfsLs<'a> {
    type Item = NodeItem;
    fn poll_next(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Self::Item>> {
        self.stream.poll_next_unpin(cx)
    }
}

impl<'a> std::future::IntoFuture for UnixfsLs<'a> {
    type Output = Result<Vec<NodeItem>, anyhow::Error>;

    type IntoFuture = BoxFuture<'a, Self::Output>;

    fn into_future(mut self) -> Self::IntoFuture {
        let span = self.span.unwrap_or(Span::current());
        async move {
            let mut items = vec![];
            while let Some(status) = self.stream.next().await {
                match status {
                    NodeItem::Error { error } => return Err(error),
                    item => items.push(item),
                }
            }
            Ok(items)
        }
        .instrument(span)
        .boxed()
    }
}