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pub use crate::codec::{PbLink, PbNode};
use core::convert::TryInto;
use libipld_base::cid;
use libipld_base::codec::Codec;
use libipld_base::error::{BlockError, IpldError};
use libipld_base::ipld::Ipld;
use thiserror::Error;
mod codec;
#[derive(Clone, Debug, Hash, PartialEq, Eq)]
pub struct DagPbCodec;
impl Codec for DagPbCodec {
const VERSION: cid::Version = cid::Version::V0;
const CODEC: cid::Codec = cid::Codec::DagProtobuf;
type Error = ProtobufError;
fn encode(ipld: &Ipld) -> Result<Box<[u8]>, Self::Error> {
let pb_node: PbNode = ipld.try_into()?;
Ok(pb_node.into_bytes())
}
fn decode(data: &[u8]) -> Result<Ipld, Self::Error> {
Ok(PbNode::from_bytes(data)?.into())
}
}
#[derive(Debug, Error)]
pub enum ProtobufError {
#[error("{0}")]
Prost(#[from] prost::DecodeError),
#[error("{0}")]
Cid(#[from] cid::Error),
#[error("{0}")]
Ipld(#[from] IpldError),
}
impl From<ProtobufError> for BlockError {
fn from(error: ProtobufError) -> Self {
Self::CodecError(error.into())
}
}
#[cfg(test)]
mod tests {
use super::*;
use libipld_base::cid::Cid;
use 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 = DagPbCodec::encode(&data).unwrap();
let data2 = DagPbCodec::decode(&bytes).unwrap();
assert_eq!(data, data2);
}
}