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use crate::Error; use core::convert::{TryFrom, TryInto}; use libipld_core::cid::Cid; use libipld_core::error::{TypeError, TypeErrorType}; use libipld_core::ipld::Ipld; use std::collections::BTreeMap; mod dag_pb { include!(concat!(env!("OUT_DIR"), "/dag_pb.rs")); } pub struct PbLink { pub cid: Cid, pub name: String, pub size: u64, } pub struct PbNode { pub links: Vec<PbLink>, pub data: Box<[u8]>, } use prost::Message; impl PbNode { pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> { let proto: dag_pb::PbNode = dag_pb::PbNode::decode(bytes)?; let data = proto.data.into_boxed_slice(); let mut links = Vec::new(); for link in proto.links { let cid = Cid::try_from(link.hash)?; let name = link.name; let size = link.tsize; links.push(PbLink { cid, name, size }); } Ok(PbNode { links, data }) } pub fn into_bytes(self) -> Box<[u8]> { let links = self .links .into_iter() .map(|link| dag_pb::PbLink { hash: link.cid.to_bytes(), name: link.name, tsize: link.size, }) .collect::<Vec<_>>(); let proto = dag_pb::PbNode { data: self.data.into_vec(), links, }; let mut res = Vec::with_capacity(proto.encoded_len()); proto .encode(&mut res) .expect("there is no situation in which the protobuf message can be invalid"); res.into_boxed_slice() } } impl Into<Ipld> for PbNode { fn into(self) -> Ipld { let mut map = BTreeMap::<String, Ipld>::new(); let links = self .links .into_iter() .map(|link| link.into()) .collect::<Vec<Ipld>>(); map.insert("Links".to_string(), links.into()); map.insert("Data".to_string(), self.data.into()); map.into() } } impl Into<Ipld> for PbLink { fn into(self) -> Ipld { let mut map = BTreeMap::<String, Ipld>::new(); map.insert("Hash".to_string(), self.cid.into()); map.insert("Name".to_string(), self.name.into()); map.insert("Tsize".to_string(), self.size.into()); map.into() } } impl TryFrom<&Ipld> for PbNode { type Error = TypeError; fn try_from(ipld: &Ipld) -> Result<PbNode, Self::Error> { let links = if let Ipld::List(links) = ipld.get("Links")? { links .iter() .map(|link| link.try_into()) .collect::<Result<_, _>>()? } else { return Err(TypeError::new(TypeErrorType::List, ipld)); }; let data = if let Ipld::Bytes(data) = ipld.get("Data")? { data.clone().into_boxed_slice() } else { return Err(TypeError::new(TypeErrorType::Bytes, ipld)); }; Ok(PbNode { links, data }) } } impl TryFrom<&Ipld> for PbLink { type Error = TypeError; fn try_from(ipld: &Ipld) -> Result<PbLink, Self::Error> { let cid = if let Ipld::Link(cid) = ipld.get("Hash")? { cid.clone() } else { return Err(TypeError::new(TypeErrorType::Link, ipld)); }; let name = if let Ipld::String(name) = ipld.get("Name")? { name.clone() } else { return Err(TypeError::new(TypeErrorType::String, ipld)); }; let size = if let Ipld::Integer(size) = ipld.get("Tsize")? { *size as u64 } else { return Err(TypeError::new(TypeErrorType::Integer, ipld)); }; Ok(PbLink { cid, name, size }) } }