summaryrefslogtreecommitdiffstats
path: root/adenosine-pds/src/repo.rs
blob: 8c14a18a0a38fda59b878873450b925030f68306 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
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::collections::HashSet;
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<S: libipld::codec::Encode<DagCborCodec>>(
        &mut self,
        record: &S,
    ) -> Result<String> {
        let block = Block::<DefaultParams>::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<String> {
        let block = Block::<DefaultParams>::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<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"))?,
            )
            .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<Option<Ipld>> {
        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 collections(&mut self, did: &str) -> Result<Vec<String>> {
        let commit = if let Some(c) = self.lookup_commit(did)? {
            self.get_commit(&c)?
        } else {
            return Err(anyhow!("DID not found in repositories: {}", did));
        };
        let map = self.mst_to_map(&commit.mst_cid)?;
        let mut collections: HashSet<String> = Default::default();
        for k in map.keys() {
            let coll = k.split("/").nth(0).unwrap();
            collections.insert(coll.to_string());
        }
        Ok(collections.into_iter().collect())
    }

    pub fn get_atp_record(
        &mut self,
        did: &str,
        collection: &str,
        tid: &str,
    ) -> Result<Option<Ipld>> {
        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<String> {
        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<String> {
        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<String> {
        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<String, String>) -> Result<String> {
        // TODO: not unwrap in iter
        let mut cid_map: BTreeMap<String, Cid> = 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<BTreeMap<String, Cid>> {
        let mut cid_map: BTreeMap<String, Cid> = 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<BTreeMap<String, String>> {
        let cid_map = self.mst_to_cid_map(mst_cid)?;
        let ret_map: BTreeMap<String, String> =
            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, alias: &str) -> Result<String> {
        let cid = load_car_to_blockstore(&mut self.db, car_path, alias)?;
        Ok(cid.to_string())
    }

    /// 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!()
    }
}

#[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<String, String> = 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()
    );
}