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
pub use crate::codec::{PbLink, PbNode};
use core::convert::TryInto;
use libipld_core::codec::{Code, Codec, Decode, Encode};
use libipld_core::ipld::Ipld;
use std::io::{Read, Write};
use thiserror::Error;
mod codec;
#[derive(Clone, Copy, Debug)]
pub struct DagPb;
impl Codec for DagPb {
const CODE: Code = Code::DagProtobuf;
type Error = Error;
}
#[derive(Debug, Error)]
pub enum Error {
#[error("{0}")]
Prost(#[from] prost::DecodeError),
#[error("{0}")]
Cid(#[from] libipld_core::cid::Error),
#[error("{0}")]
TypeError(#[from] libipld_core::error::TypeError),
#[error("{0}")]
Io(#[from] std::io::Error),
}
impl Encode<DagPb> for Ipld {
fn encode<W: Write>(&self, w: &mut W) -> Result<(), Error> {
let pb_node: PbNode = self.try_into()?;
let bytes = pb_node.into_bytes();
w.write_all(&bytes)?;
Ok(())
}
}
impl Decode<DagPb> for Ipld {
fn decode<R: Read>(r: &mut R) -> Result<Self, Error> {
let mut bytes = Vec::new();
r.read_to_end(&mut bytes)?;
Ok(PbNode::from_bytes(&bytes)?.into())
}
}
#[cfg(test)]
mod tests {
use super::*;
use libipld_core::cid::Cid;
use libipld_core::multihash::Sha2_256;
use std::collections::BTreeMap;
#[test]
fn test_encode_decode() {
let cid = Cid::new_v0(Sha2_256::digest(b"cid")).unwrap();
let mut pb_link = BTreeMap::<String, Ipld>::new();
pb_link.insert("Hash".to_string(), cid.into());
pb_link.insert("Name".to_string(), "block".to_string().into());
pb_link.insert("Tsize".to_string(), 13.into());
let links: Vec<Ipld> = vec![pb_link.into()];
let mut pb_node = BTreeMap::<String, Ipld>::new();
pb_node.insert("Data".to_string(), b"Here is some data\n".to_vec().into());
pb_node.insert("Links".to_string(), links.into());
let data: Ipld = pb_node.into();
let bytes = DagPb::encode(&data).unwrap();
let data2 = DagPb::decode(&bytes).unwrap();
assert_eq!(data, data2);
}
}