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use crate::mst::{collect_mst_keys, CommitNode, MetadataNode, RootNode};
use anyhow::{anyhow, Result};
use ipfs_sqlite_block_store::BlockStore;
use libipld::cbor::DagCborCodec;
use libipld::multihash::Code;
use libipld::prelude::Codec;
use libipld::store::DefaultParams;
use libipld::{Block, Cid, DagCbor, Ipld};
use std::borrow::Cow;
use std::collections::BTreeMap;
use std::path::PathBuf;
use std::str::FromStr;
pub struct RepoCommit {
pub sig: Box<[u8]>,
pub did: String,
pub prev: Option<String>,
pub mst_cid: String,
}
pub struct RepoStore {
db: BlockStore<libipld::DefaultParams>,
}
impl RepoStore {
pub fn open(db_path: &PathBuf) -> Result<Self> {
Ok(RepoStore {
db: BlockStore::open(db_path, Default::default())?,
})
}
pub fn open_ephemeral() -> Result<Self> {
Ok(RepoStore {
db: BlockStore::open_path(ipfs_sqlite_block_store::DbPath::Memory, Default::default())?,
})
}
pub fn new_connection(&mut self) -> Result<Self> {
Ok(RepoStore {
db: self.db.additional_connection()?,
})
}
pub fn get_ipld(&mut self, cid: &str) -> Result<Ipld> {
let ipld_cid = Cid::from_str(cid)?;
if let Some(b) = self.db.get_block(&ipld_cid)? {
let block: Block<DefaultParams> = Block::new(ipld_cid, b)?;
block.ipld()
} else {
Err(anyhow!("missing IPLD CID: {}", cid))
}
}
pub fn get_blob(&mut self, cid: &str) -> Result<Option<Vec<u8>>> {
let cid = Cid::from_str(cid)?;
Ok(self.db.get_block(&cid)?)
}
/// Returns CID that was inserted
pub fn put_ipld(&mut self, record: &Ipld) -> Result<String> {
let block = Block::<DefaultParams>::encode(DagCborCodec, Code::Sha2_256, record)?;
let cid = block.cid().clone();
self.db.put_block(block, None)?;
Ok(cid.to_string())
}
/// Returns CID that was inserted
pub fn put_blob(&mut self, data: Vec<u8>) -> Result<String> {
let block = Block::<DefaultParams>::encode(libipld::raw::RawCodec, Code::Sha2_256, &data)?;
let cid = block.cid().clone();
self.db.put_block(block, None)?;
Ok(cid.to_string())
}
/// Quick alias lookup
pub fn lookup_commit(&mut self, did: &str) -> Result<Option<String>> {
Ok(self
.db
.resolve(Cow::from(did.as_bytes()))?
.map(|cid| cid.to_string()))
}
pub fn get_commit(&mut self, commit_cid: &str) -> Result<RepoCommit> {
// read records by CID: commit, root, meta
let commit_node: CommitNode = DagCborCodec.decode(
&self
.db
.get_block(&Cid::from_str(commit_cid)?)?
.ok_or(anyhow!("expected commit block in store"))?,
)?;
let root_node: RootNode = DagCborCodec.decode(
&self
.db
.get_block(&commit_node.root)?
.ok_or(anyhow!("expected root block in store"))?,
)?;
let metadata_node: MetadataNode = DagCborCodec.decode(
&self
.db
.get_block(&root_node.meta)?
.ok_or(anyhow!("expected metadata block in store"))?,
)?;
assert_eq!(metadata_node.datastore, "mst");
assert_eq!(metadata_node.version, 1);
Ok(RepoCommit {
sig: commit_node.sig,
did: metadata_node.did,
prev: root_node.prev.map(|cid| cid.to_string()),
mst_cid: root_node.data.to_string(),
})
}
pub fn get_record_by_key(&mut self, commit_cid: &str, key: &str) -> Result<Option<Ipld>> {
let map = self.as_map(commit_cid)?;
if let Some(cid) = map.get(key) {
self.get_ipld(&cid.to_string()).map(|v| Some(v))
} else {
Ok(None)
}
}
pub fn write_root(&mut self, did: &str, mst_cid: &str, prev: Option<&str>) -> Result<String> {
unimplemented!()
}
pub fn write_commit(&mut self, did: &str, root_cid: &str, sig: &str) -> Result<String> {
// TODO: also update alias to point to new commit
unimplemented!()
}
pub fn write_map(&self, map: Result<BTreeMap<String, String>>) -> Result<String> {
unimplemented!()
}
fn as_cid_map(&mut self, commit_cid: &str) -> Result<BTreeMap<String, Cid>> {
let commit = self.get_commit(commit_cid)?;
let mut cid_map: BTreeMap<String, Cid> = Default::default();
let mst_cid = Cid::from_str(&commit.mst_cid)?;
collect_mst_keys(&mut self.db, &mst_cid, &mut cid_map)?;
Ok(cid_map)
}
/// Returns all the keys for a directory, as a sorted vec of strings
pub fn as_map(&mut self, commit_cid: &str) -> Result<BTreeMap<String, String>> {
let cid_map = self.as_cid_map(commit_cid)?;
let ret_map: BTreeMap<String, String> =
BTreeMap::from_iter(cid_map.into_iter().map(|(k, v)| (k, v.to_string())));
Ok(ret_map)
}
/// Exports in CAR format to a Writer
///
/// The "from" commit CID feature is not implemented.
pub fn write_car<W: std::io::Write>(
&mut self,
did: &str,
_from_commit_cid: Option<&str>,
out: &mut W,
) -> Result<()> {
unimplemented!()
}
}
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