feat: store pins in datastore instead of DAG

Adds a `.pins` datastore to `ipfs-repo` and uses that to store
pins as cbor binary keyed by b58 stringified multihashes.

Each pin has several fields:

```javascript
{
  cid: // buffer, the full CID pinned
  type: // string, 'recursive' or 'direct'
  name: // string, a human-readable name for the pin
}
```

BREAKING CHANGES:

* pins are now stored in a datastore, a repo miration will be necessary
* ipfs.pins.add now returns an async generator
* ipfs.pins.rm now returns an async generator

Depends on:

- [ ] ipfs/js-ipfs-repo#221
- [ ] ipfs-inactive/interface-js-ipfs-core#594

package.json

@@ -79,6 +79,7 @@
     "bl": "^4.0.0",
     "bs58": "^4.0.1",
     "byteman": "^1.3.5",
+    "cbor": "^4.1.4",
     "cid-tool": "~0.4.0",
     "cids": "^0.7.2",
     "class-is": "^1.1.0",
@@ -102,7 +103,7 @@
     "ipfs-http-response": "^0.5.0",
     "ipfs-mfs": "^1.0.0",
     "ipfs-multipart": "^0.3.0",
-    "ipfs-repo": "^0.30.0",
+    "ipfs-repo": "github:ipfs/js-ipfs-repo#store-pins-in-datastore",
     "ipfs-unixfs": "^0.3.0",
     "ipfs-unixfs-exporter": "^0.41.0",
     "ipfs-unixfs-importer": "^0.44.0",
@@ -120,8 +121,10 @@
     "is-ipfs": "~0.6.1",
     "it-all": "^1.0.1",
     "it-concat": "^1.0.0",
+    "it-first": "^1.0.1",
     "it-glob": "0.0.7",
     "it-last": "^1.0.1",
+    "it-parallel-batch": "^1.0.3",
     "it-pipe": "^1.1.0",
     "it-tar": "^1.2.1",
     "it-to-stream": "^0.1.1",
@@ -184,7 +187,7 @@
     "form-data": "^3.0.0",
     "go-ipfs-dep": "0.4.23-3",
     "hat": "0.0.3",
-    "interface-ipfs-core": "^0.132.0",
+    "interface-ipfs-core": "github:ipfs/interface-js-ipfs-core#store-pins-in-datastore",
     "ipfs-interop": "^1.0.0",
     "ipfsd-ctl": "^3.0.0",
     "ncp": "^2.0.0",

src/core/components/init.js

@@ -110,7 +110,6 @@ module.exports = ({
     }
 
     const pinManager = new PinManager(repo, dag)
-    await pinManager.load()
 
     const pin = {
       add: Components.pin.add({ pinManager, gcLock, dag }),

src/core/components/pin/add.js

@@ -2,71 +2,50 @@
 'use strict'
 
 const { resolvePath, withTimeoutOption } = require('../../utils')
+const PinManager = require('./pin-manager')
+const { PinTypes } = PinManager
 
 module.exports = ({ pinManager, gcLock, dag }) => {
-  return withTimeoutOption(async function add (paths, options) {
+  return withTimeoutOption(async function * add (paths, options) {
     options = options || {}
 
     const recursive = options.recursive !== false
     const cids = await resolvePath(dag, paths, { signal: options.signal })
-    const pinAdd = async () => {
-      const results = []
-
+    const pinAdd = async function * () {
       // verify that each hash can be pinned
       for (const cid of cids) {
-        const key = cid.toBaseEncodedString()
-
-        if (recursive) {
-          if (pinManager.recursivePins.has(key)) {
-            // it's already pinned recursively
-            results.push(cid)
+        const isPinned = await pinManager.isPinnedWithType(cid, [PinTypes.recursive, PinTypes.direct])
+        const pinned = isPinned.pinned
 
-            continue
-          }
-
-          // entire graph of nested links should be pinned,
-          // so make sure we have all the objects
-          await pinManager.fetchCompleteDag(key, { preload: options.preload, signal: options.signal })
+        if (pinned) {
+          throw new Error(`${cid} already pinned with type ${isPinned.reason}`)
+        }
 
-          // found all objects, we can add the pin
-          results.push(cid)
+        if (recursive) {
+          await pinManager.pinRecursively(cid)
         } else {
-          if (pinManager.recursivePins.has(key)) {
-            // recursive supersedes direct, can't have both
-            throw new Error(`${key} already pinned recursively`)
-          }
-
-          if (!pinManager.directPins.has(key)) {
-            // make sure we have the object
-            await dag.get(cid, { preload: options.preload })
-          }
-
-          results.push(cid)
+          await pinManager.pinDirectly(cid)
         }
-      }
 
-      // update the pin sets in memory
-      const pinset = recursive ? pinManager.recursivePins : pinManager.directPins
-      results.forEach(cid => pinset.add(cid.toString()))
+        yield { cid }
 
-      // persist updated pin sets to datastore
-      await pinManager.flushPins()
-
-      return results.map(cid => ({ cid }))
+        continue
+      }
     }
 
     // When adding a file, we take a lock that gets released after pinning
     // is complete, so don't take a second lock here
     const lock = Boolean(options.lock)
 
     if (!lock) {
-      return pinAdd()
+      yield * pinAdd()
+      return
     }
 
     const release = await gcLock.readLock()
 
     try {
-      await pinAdd()
+      yield * pinAdd()
     } finally {
       release()
     }

src/core/components/pin/ls.js

@@ -1,13 +1,22 @@
 /* eslint max-nested-callbacks: ["error", 8] */
 'use strict'
 
-const { parallelMap } = require('streaming-iterables')
-const CID = require('cids')
 const { resolvePath } = require('../../utils')
 const PinManager = require('./pin-manager')
 const { PinTypes } = PinManager
 
-const PIN_LS_CONCURRENCY = 8
+function toPin (type, cid, name) {
+  const output = {
+    type,
+    cid
+  }
+
+  if (name) {
+    output.name = name
+  }
+
+  return output
+}
 
 module.exports = ({ pinManager, dag }) => {
   return async function * ls (paths, options) {
@@ -25,67 +34,68 @@ module.exports = ({ pinManager, dag }) => {
       if (typeof options.type === 'string') {
         type = options.type.toLowerCase()
       }
-      const err = PinManager.checkPinType(type)
-      if (err) {
-        throw err
-      }
+
+      PinManager.checkPinType(type)
+    } else {
+      options.type = PinTypes.all
     }
 
     if (paths) {
-      paths = Array.isArray(paths) ? paths : [paths]
-
       // check the pinned state of specific hashes
-      const cids = await resolvePath(dag, paths)
+      const cids = await resolvePath(dag, paths, { signal: options.signal })
+      let noMatch = true
 
-      yield * parallelMap(PIN_LS_CONCURRENCY, async cid => {
-        const { reason, pinned } = await pinManager.isPinnedWithType(cid, type)
+      for (const cid of cids) {
+        const { reason, pinned, parent } = await pinManager.isPinnedWithType(cid, type)
 
         if (!pinned) {
-          throw new Error(`path '${paths[cids.indexOf(cid)]}' is not pinned`)
+          throw new Error(`path '${paths}' is not pinned`)
         }
 
-        if (reason === PinTypes.direct || reason === PinTypes.recursive) {
-          return { cid, type: reason }
+        switch (reason) {
+          case PinTypes.direct:
+          case PinTypes.recursive:
+            noMatch = false
+            yield {
+              type: reason,
+              cid
+            }
+            break
+          default:
+            noMatch = false
+            yield {
+              type: `${PinTypes.indirect} through ${parent}`,
+              cid
+            }
         }
+      }
 
-        return { cid, type: `${PinTypes.indirect} through ${reason}` }
-      }, cids)
+      if (noMatch) {
+        throw new Error('No match found')
+      }
 
       return
     }
 
-    // show all pinned items of type
-    let pins = []
-
-    if (type === PinTypes.direct || type === PinTypes.all) {
-      pins = pins.concat(
-        Array.from(pinManager.directPins).map(cid => ({
-          type: PinTypes.direct,
-          cid: new CID(cid)
-        }))
-      )
-    }
-
     if (type === PinTypes.recursive || type === PinTypes.all) {
-      pins = pins.concat(
-        Array.from(pinManager.recursivePins).map(cid => ({
-          type: PinTypes.recursive,
-          cid: new CID(cid)
-        }))
-      )
+      for await (const { cid, name } of pinManager.recursiveKeys()) {
+        yield toPin(PinTypes.recursive, cid, name)
+      }
     }
 
     if (type === PinTypes.indirect || type === PinTypes.all) {
-      const indirects = await pinManager.getIndirectKeys(options)
-
-      pins = pins
-        // if something is pinned both directly and indirectly,
-        // report the indirect entry
-        .filter(({ cid }) => !indirects.includes(cid.toString()) || !pinManager.directPins.has(cid.toString()))
-        .concat(indirects.map(cid => ({ type: PinTypes.indirect, cid: new CID(cid) })))
+      for await (const cid of pinManager.indirectKeys(options)) {
+        yield {
+          type: PinTypes.indirect,
+          cid
+        }
+      }
     }
 
-    // FIXME: https://github.com/ipfs/js-ipfs/issues/2244
-    yield * pins
+    if (type === PinTypes.direct || type === PinTypes.all) {
+      for await (const { cid, name } of pinManager.directKeys()) {
+        yield toPin(PinTypes.direct, cid, name)
+      }
+    }
   }
 }