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use std::collections::HashMap;
use anyhow::anyhow;
use anyhow::Result;
use daglib::Node as _;
use daglib::DagBackend;
use crate::backend::Id;
use crate::backend::Node;
use crate::backend::IpfsEmbedBackend;
pub struct Profile {
dag: daglib::AsyncDag<Id, Node, IpfsEmbedBackend>,
cache: HashMap<Id, LoadedNode>,
}
impl Profile {
pub async fn load(head: Id) -> Result<Self> {
let backend = IpfsEmbedBackend::new_in_memory(1000).await?;
let dag = daglib::AsyncDag::load(backend, head).await?;
let mut cache = HashMap::new();
let (id, node) = LoadedNode::load(dag.backend(), dag.head().clone()).await?;
cache.insert(id, node);
Ok(Profile { dag, cache })
}
pub async fn create(node: LoadedNode) -> Result<Self> {
let backend = IpfsEmbedBackend::new_in_memory(1000).await?;
Profile::create_with_backend(backend, node).await
}
pub async fn create_with_backend(backend: IpfsEmbedBackend, loaded_node: LoadedNode) -> Result<Self> {
let payload_cid = backend.write_payload(&loaded_node.payload).await?;
let node = Node::new(loaded_node.v.clone(), loaded_node.parents.clone(), payload_cid);
let dag = daglib::AsyncDag::new(backend, node).await?;
let head = dag.head().clone();
let mut cache = HashMap::new();
cache.insert(head, loaded_node);
Ok(Profile { dag, cache })
}
}
pub struct LoadedNode {
v: String,
parents: Vec<crate::backend::Id>,
payload: crate::backend::Payload,
}
impl LoadedNode {
async fn load(backend: &IpfsEmbedBackend, id: Id) -> Result<(Id, LoadedNode)> {
let (id, node) = backend
.get(id)
.await?
.ok_or_else(|| anyhow!("No node found"))?;
let payload = {
let ipfs = backend.ipfs();
let block = ipfs.fetch(node.payload_id(), ipfs.peers()).await?;
block.decode::<libipld::cbor::DagCborCodec, crate::backend::Payload>()?
};
Ok((id, {
LoadedNode {
v: node.version().to_string(),
parents: node.parent_ids().clone(),
payload
}
}))
}
}
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