use crate::load_car_to_blockstore; use crate::mst::{collect_mst_keys, generate_mst, CommitNode, MetadataNode, RootNode}; use anyhow::{anyhow, ensure, Context, 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, 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, pub mst_cid: String, } pub struct RepoStore { db: BlockStore, } impl RepoStore { pub fn open(db_path: &PathBuf) -> Result { Ok(RepoStore { db: BlockStore::open(db_path, Default::default())?, }) } pub fn open_ephemeral() -> Result { Ok(RepoStore { db: BlockStore::open_path(ipfs_sqlite_block_store::DbPath::Memory, Default::default())?, }) } pub fn new_connection(&mut self) -> Result { Ok(RepoStore { db: self.db.additional_connection()?, }) } pub fn get_ipld(&mut self, cid: &str) -> Result { let ipld_cid = Cid::from_str(cid)?; if let Some(b) = self.db.get_block(&ipld_cid)? { let block: Block = Block::new(ipld_cid, b)?; block.ipld() } else { Err(anyhow!("missing IPLD CID: {}", cid)) } } pub fn get_blob(&mut self, cid: &str) -> Result>> { let cid = Cid::from_str(cid)?; Ok(self.db.get_block(&cid)?) } /// Returns CID that was inserted pub fn put_ipld>( &mut self, record: &S, ) -> Result { let block = Block::::encode(DagCborCodec, Code::Sha2_256, record)?; let cid = block.cid().clone(); self.db .put_block(block, None) .context("writing IPLD DAG-CBOR record to blockstore")?; Ok(cid.to_string()) } /// Returns CID that was inserted pub fn put_blob(&mut self, data: &[u8]) -> Result { let block = Block::::encode(libipld::raw::RawCodec, Code::Sha2_256, data)?; let cid = block.cid().clone(); self.db .put_block(block, None) .context("writing non-record blob to blockstore")?; Ok(cid.to_string()) } /// Quick alias lookup pub fn lookup_commit(&mut self, did: &str) -> Result> { Ok(self .db .resolve(Cow::from(did.as_bytes()))? .map(|cid| cid.to_string())) } pub fn get_commit(&mut self, commit_cid: &str) -> Result { // 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"))?, ) .context("parsing commit IPLD node from blockstore")?; let root_node: RootNode = DagCborCodec .decode( &self .db .get_block(&commit_node.root)? .ok_or(anyhow!("expected root block in store"))?, ) .context("parsing root IPLD node from blockstore")?; let metadata_node: MetadataNode = DagCborCodec .decode( &self .db .get_block(&root_node.meta)? .ok_or(anyhow!("expected metadata block in store"))?, ) .context("parsing metadata IPLD node from blockstore")?; ensure!( metadata_node.datastore == "mst", "unexpected repo metadata.datastore: {}", metadata_node.datastore ); ensure!( metadata_node.version == 1, "unexpected repo metadata.version: {}", metadata_node.version ); 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_mst_record_by_key(&mut self, mst_cid: &str, key: &str) -> Result> { let map = self.mst_to_map(mst_cid)?; if let Some(cid) = map.get(key) { self.get_ipld(&cid.to_string()).map(|v| Some(v)) } else { Ok(None) } } pub fn get_atp_record( &mut self, did: &str, collection: &str, tid: &str, ) -> Result> { let commit = if let Some(c) = self.lookup_commit(did)? { self.get_commit(&c)? } else { return Ok(None); }; let record_key = format!("/{}/{}", collection, tid); self.get_mst_record_by_key(&commit.mst_cid, &record_key) } pub fn write_metadata(&mut self, did: &str) -> Result { self.put_ipld(&MetadataNode { datastore: "mst".to_string(), did: did.to_string(), version: 1, }) } pub fn write_root( &mut self, meta_cid: &str, prev: Option<&str>, mst_cid: &str, ) -> Result { self.put_ipld(&RootNode { auth_token: None, // TODO: not unwrap here prev: prev.map(|s| Cid::from_str(s).unwrap()), // TODO: not 'metadata'? meta: Cid::from_str(meta_cid)?, data: Cid::from_str(mst_cid)?, }) } pub fn write_commit(&mut self, did: &str, root_cid: &str, sig: &str) -> Result { let commit_cid = self.put_ipld(&CommitNode { root: Cid::from_str(root_cid)?, sig: sig.as_bytes().to_vec().into_boxed_slice(), })?; self.db .alias(did.as_bytes().to_vec(), Some(&Cid::from_str(&commit_cid)?))?; Ok(commit_cid.to_string()) } pub fn mst_from_map(&mut self, map: &BTreeMap) -> Result { // TODO: not unwrap in iter let mut cid_map: BTreeMap = BTreeMap::from_iter( map.iter() .map(|(k, v)| (k.to_string(), Cid::from_str(&v).unwrap())), ); let mst_cid = generate_mst(&mut self.db, &mut cid_map)?; Ok(mst_cid.to_string()) } fn mst_to_cid_map(&mut self, mst_cid: &str) -> Result> { let mut cid_map: BTreeMap = Default::default(); let mst_cid = Cid::from_str(mst_cid)?; collect_mst_keys(&mut self.db, &mst_cid, &mut cid_map) .context("reading repo MST from blockstore")?; Ok(cid_map) } /// Returns all the keys for a directory, as a sorted vec of strings pub fn mst_to_map(&mut self, mst_cid: &str) -> Result> { let cid_map = self.mst_to_cid_map(mst_cid)?; let ret_map: BTreeMap = BTreeMap::from_iter(cid_map.into_iter().map(|(k, v)| (k, v.to_string()))); Ok(ret_map) } /// returns the root commit from CAR file pub fn load_car(&mut self, car_path: &PathBuf) -> Result { let cid = load_car_to_blockstore(&mut self.db, car_path)?; Ok(cid.to_string()) } /// Exports in CAR format to a Writer /// /// The "from" commit CID feature is not implemented. pub fn write_car( &mut self, _did: &str, _from_commit_cid: Option<&str>, _out: &mut W, ) -> Result<()> { unimplemented!() } } #[test] fn test_repo_mst() { use libipld::ipld; let mut repo = RepoStore::open_ephemeral().unwrap(); let did = "did:plc:dummy"; // basic blob and IPLD record put/get let blob = b"beware the swamp thing"; let blob_cid: String = repo.put_blob(blob).unwrap(); let record = ipld!({"some-thing": 123}); let record_cid: String = repo.put_ipld(&record).unwrap(); repo.get_blob(&blob_cid).unwrap().unwrap(); repo.get_ipld(&record_cid).unwrap(); // basic MST get/put let mut map: BTreeMap = Default::default(); let empty_map_cid: String = repo.mst_from_map(&map).unwrap(); assert_eq!(map, repo.mst_to_map(&empty_map_cid).unwrap()); assert!(repo .get_mst_record_by_key(&empty_map_cid, "/records/1") .unwrap() .is_none()); map.insert("/blobs/1".to_string(), blob_cid.clone()); map.insert("/blobs/2".to_string(), blob_cid.clone()); map.insert("/records/1".to_string(), record_cid.clone()); map.insert("/records/2".to_string(), record_cid.clone()); let simple_map_cid: String = repo.mst_from_map(&map).unwrap(); assert_eq!(map, repo.mst_to_map(&simple_map_cid).unwrap()); // create root and commit IPLD nodes let meta_cid = repo.write_metadata(did).unwrap(); let simple_root_cid = repo.write_root(&meta_cid, None, &simple_map_cid).unwrap(); let simple_commit_cid = repo .write_commit(did, &simple_root_cid, "dummy-sig") .unwrap(); assert_eq!( Some(record.clone()), repo.get_mst_record_by_key(&simple_map_cid, "/records/1") .unwrap() ); assert_eq!( Some(record.clone()), repo.get_atp_record(did, "records", "1").unwrap() ); assert!(repo .get_mst_record_by_key(&simple_map_cid, "/records/3") .unwrap() .is_none()); assert!(repo.get_atp_record(did, "records", "3").unwrap().is_none()); assert_eq!( Some(simple_commit_cid.clone()), repo.lookup_commit(did).unwrap() ); map.insert("/records/3".to_string(), record_cid.clone()); let simple3_map_cid: String = repo.mst_from_map(&map).unwrap(); let simple3_root_cid = repo .write_root(&meta_cid, Some(&simple_commit_cid), &simple3_map_cid) .unwrap(); let simple3_commit_cid = repo .write_commit(did, &simple3_root_cid, "dummy-sig3") .unwrap(); assert_eq!(map, repo.mst_to_map(&simple3_map_cid).unwrap()); assert_eq!( Some(record.clone()), repo.get_mst_record_by_key(&simple3_map_cid, "/records/3") .unwrap() ); assert_eq!( Some(record.clone()), repo.get_atp_record(did, "records", "3").unwrap() ); let commit = repo.get_commit(&simple3_commit_cid).unwrap(); assert_eq!(commit.sig.to_vec(), b"dummy-sig3".to_vec()); assert_eq!(commit.did, did); assert_eq!(commit.prev, Some(simple_commit_cid)); assert_eq!(commit.mst_cid, simple3_map_cid); assert_eq!( Some(simple3_commit_cid.clone()), repo.lookup_commit(did).unwrap() ); }