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1478 lines (1171 loc) · 40.9 KB
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const { EventEmitter } = require('events')
const isOptions = require('is-options')
const crypto = require('hypercore-crypto')
const CoreStorage = require('hypercore-storage')
const c = require('compact-encoding')
const b4a = require('b4a')
const NoiseSecretStream = require('@hyperswarm/secret-stream')
const Protomux = require('protomux')
const id = require('hypercore-id-encoding')
const safetyCatch = require('safety-catch')
const unslab = require('unslab')
const flat = require('flat-tree')
const assert = require('nanoassert')
const { SMALL_WANTS } = require('./lib/feature-flags')
const { UPDATE_COMPAT } = require('./lib/wants')
const MarkBitfield = require('./lib/mark-bitfield')
const inspect = require('./lib/inspect')
const Core = require('./lib/core')
const Info = require('./lib/info')
const Download = require('./lib/download')
const DefaultEncryption = require('./lib/default-encryption')
const caps = require('./lib/caps')
const Replicator = require('./lib/replicator')
const Verifier = require('./lib/verifier')
const { manifestHash, createManifest, encodeManifest } = Verifier
const { ReadStream, WriteStream, ByteStream } = require('./lib/streams')
const { MerkleTree } = require('./lib/merkle-tree')
const { proof, verify } = require('./lib/fully-remote-proof')
const {
ASSERTION,
BAD_ARGUMENT,
SESSION_CLOSED,
SESSION_MOVED,
SESSION_NOT_WRITABLE,
SNAPSHOT_NOT_AVAILABLE,
DECODING_ERROR,
REQUEST_CANCELLED,
INVALID_CHECKSUM
} = require('hypercore-errors')
// Hypercore actually does not have any notion of max/min block sizes
// but we enforce 15mb to ensure smooth replication (each block is transmitted atomically)
const MAX_SUGGESTED_BLOCK_SIZE = 15 * 1024 * 1024
class Hypercore extends EventEmitter {
constructor(storage, key, opts) {
super()
if (isOptions(storage) && !storage.db) {
opts = storage
storage = null
key = opts.key || null
} else if (isOptions(key)) {
opts = key
key = opts.key || null
}
if (key && typeof key === 'string') key = id.decode(key)
if (!opts) opts = {}
if (!storage) storage = opts.storage
this.core = null
this.state = null
this.encryption = null
this.extensions = new Map()
this.valueEncoding = null
this.encodeBatch = null
this.activeRequests = []
this.sessions = null
this.ongc = null
this.keyPair = opts.keyPair || null
this.readable = true
this.writable = false
this.exclusive = false
this.opened = false
this.closed = false
this.weak = !!opts.weak
this.snapshotted = !!opts.snapshot
this.onseq = opts.onseq || null
this.onwait = opts.onwait || null
this.wait = opts.wait !== false
this.timeout = opts.timeout || 0
this.preload = null
this.closing = null
this.opening = null
this._readonly = opts.writable === false
this._preappend = preappend.bind(this)
this._snapshot = null
this._findingPeers = 0
this._active = opts.weak ? !!opts.active : opts.active !== false
this.waits = 0
// Mark & Sweep GC
this._marking = false
this._marks = null
this._sessionIndex = -1
this._stateIndex = -1 // maintained by session state
this._monitorIndex = -1 // maintained by replication state
this.opening = this._open(storage, key, opts)
this.opening.catch(safetyCatch)
this.on('newListener', maybeAddMonitor)
}
[Symbol.for('nodejs.util.inspect.custom')](depth, opts) {
return inspect(this, depth, opts)
}
static MAX_SUGGESTED_BLOCK_SIZE = MAX_SUGGESTED_BLOCK_SIZE
static DefaultEncryption = DefaultEncryption
static SMALL_WANTS = SMALL_WANTS
static enable(flag) {
const enableCompat = (flag & SMALL_WANTS) === 0
UPDATE_COMPAT(enableCompat)
}
static setRecoveryPeers(peers) {
Core.setRecoveryPeers(peers)
}
static key(manifest, { compat, version, namespace } = {}) {
if (b4a.isBuffer(manifest)) {
manifest =
manifest.byteLength === 32
? { version, signers: [{ publicKey: manifest, namespace }] }
: this.parseManifest(manifest)
}
return compat ? manifest.signers[0].publicKey : manifestHash(createManifest(manifest))
}
static parseManifest(manifest, key) {
const parsed = createManifest(manifest)
if (parsed === null) return null
if (parsed.quorum > parsed.signers.length) {
throw BAD_ARGUMENT('Quorum should not be higher than the number of signers')
}
if (key && !Verifier.isValidManifest(key, parsed)) {
throw INVALID_CHECKSUM('Manifest does not hash to provided key')
}
return parsed
}
static discoveryKey(key) {
return crypto.discoveryKey(key)
}
static blockEncryptionKey(key, encryptionKey) {
return DefaultEncryption.blockEncryptionKey(key, encryptionKey)
}
static getProtocolMuxer(stream) {
return stream.noiseStream.userData
}
static createCore(storage, opts) {
return new Core(Hypercore.defaultStorage(storage), { autoClose: false, ...opts })
}
static createProtocolStream(isInitiator, opts = {}) {
let outerStream = Protomux.isProtomux(isInitiator)
? isInitiator.stream
: isStream(isInitiator)
? isInitiator
: opts.stream
let noiseStream = null
if (outerStream) {
noiseStream = outerStream.noiseStream
} else {
noiseStream = new NoiseSecretStream(isInitiator, null, opts)
outerStream = noiseStream.rawStream
}
if (!noiseStream) throw BAD_ARGUMENT('Invalid stream', this.discoveryKey)
if (!noiseStream.userData) {
const protocol = Protomux.from(noiseStream)
if (opts.keepAlive !== false && noiseStream.keepAlive === 0) {
noiseStream.setKeepAlive(5000)
}
noiseStream.userData = protocol
}
if (opts.ondiscoverykey) {
const ondiscoverykey = createDiscoveryKeyHandler(opts.ondiscoverykey)
noiseStream.userData.pair({ protocol: 'hypercore/alpha' }, ondiscoverykey)
}
return outerStream
}
static defaultStorage(storage, opts = {}) {
if (CoreStorage.isCoreStorage(storage)) return storage
const directory = storage
return new CoreStorage(directory, opts)
}
static clearRequests(session, err) {
Replicator.clearRequests(session, err)
}
static destroyRequests(session, err) {
if (isRequestsDestroyed(session)) return
Replicator.clearRequests(session, err)
session.push(null) // mark as dead
}
static async treeHashFromStorage(session, length = session.length) {
const roots = await MerkleTree.getRoots(session.state, length)
return crypto.tree(roots)
}
snapshot(opts) {
return this.session({ ...opts, snapshot: true })
}
compact() {
return this.core.compact()
}
session(opts = {}) {
if (this.closing) {
// This makes the closing logic a lot easier. If this turns out to be a problem
// in practice, open an issue and we'll try to make a solution for it.
throw SESSION_CLOSED('Cannot make sessions on a closing core', this.discoveryKey)
}
if (opts.checkout !== undefined && !opts.name && !opts.atom) {
throw ASSERTION('Checkouts are only supported on atoms or named sessions', this.discoveryKey)
}
const wait = opts.wait === false ? false : this.wait
const writable = opts.writable === undefined ? !this._readonly : opts.writable === true
const onwait = opts.onwait === undefined ? this.onwait : opts.onwait
const onseq = opts.onseq === undefined ? this.onseq : opts.onseq
const timeout = opts.timeout === undefined ? this.timeout : opts.timeout
const weak = opts.weak === undefined ? this.weak : opts.weak
const marking = this._marking
const marks = this._marks
const Clz = opts.class || Hypercore
const s = new Clz(null, this.key, {
...opts,
wait,
onwait,
onseq,
timeout,
writable,
weak,
parent: this
})
s._marking = marking
s._marks = marks
return s
}
async setEncryptionKey(key, opts) {
if (!this.opened) await this.opening
const encryption = this._getEncryptionProvider({ key, block: !!(opts && opts.block) })
return this.setEncryption(encryption)
}
async setEncryption(encryption) {
if (!this.opened) await this.opening
if (encryption === null) {
this.encryption = encryption
return
}
if (!isEncryptionProvider(encryption)) {
throw ASSERTION('Provider does not satisfy HypercoreEncryption interface', this.discoveryKey)
}
this.encryption = encryption
}
async setGroup(topic) {
if (!this.opened) await this.opening
return this.core.setGroup(topic)
}
setKeyPair(keyPair) {
this.keyPair = keyPair
}
setActive(bool) {
const active = !!bool
if (active === this._active || this.closing) return
this._active = active
if (!this.opened) return
this.core.replicator.updateActivity(this._active ? 1 : -1)
}
async setAlwaysLatestBlock(bool) {
if (!this.opened) await this.opening
const enabled = !!bool
if (enabled === this.core.replicator._alwaysLatestBlockEnabled) return
this.core.replicator._alwaysLatestBlockEnabled = enabled
this.core.replicator._alwaysLatestBlock += enabled
? 1
: this.core.replicator._alwaysLatestBlock === 0
? 0
: -1
}
async _open(storage, key, opts) {
const preload = opts.preload || (opts.parent && opts.parent.preload)
if (preload) {
this.sessions = [] // in case someone looks at it like with peers
this.preload = preload
opts = { ...opts, ...(await this.preload) }
this.preload = null
}
const parent = opts.parent || null
const core = opts.core || (parent && parent.core)
const sessions = opts.sessions || (parent && parent.sessions)
const ongc = opts.ongc || (parent && parent.ongc)
if (core) this.core = core
if (ongc) this.ongc = ongc
if (sessions) this.sessions = sessions
if (this.sessions === null) this.sessions = []
this._sessionIndex = this.sessions.push(this) - 1
if (this.core === null) initOnce(this, storage, key, opts)
if (this._monitorIndex === -2) this.core.addMonitor(this)
try {
await this._openSession(opts)
} catch (err) {
if (this.core.autoClose && this.core.hasSession() === false) await this.core.close()
if (this.exclusive) this.core.unlockExclusive()
this.core.removeMonitor(this)
this._removeSession()
if (this.state !== null) this.state.removeSession(this)
this.closed = true
this.emit('close')
throw err
}
// Setup automatic recovery if in repair mode
if (this.core._repairMode) {
const recoverTreeNodeFromPeersBound = this.recoverTreeNodeFromPeers.bind(this)
this.once('repaired', () => {
this.off('peer-add', recoverTreeNodeFromPeersBound)
})
this.on('peer-add', recoverTreeNodeFromPeersBound)
}
this.emit('ready')
// if we are a weak session the core might have closed...
if (this.core.closing) this.close().catch(safetyCatch)
}
_removeSession() {
if (this._sessionIndex === -1) return
const head = this.sessions.pop()
if (head !== this) this.sessions[(head._sessionIndex = this._sessionIndex)] = head
this._sessionIndex = -1
if (this.ongc !== null) this.ongc(this)
}
async _openSession(opts) {
if (this.core.opened === false) await this.core.ready()
if (opts.group && !this.core.header.group) {
await this.core.setGroup(opts.group)
}
if (this.keyPair === null) this.keyPair = opts.keyPair || this.core.header.keyPair
const parent = opts.parent || null
if (parent && parent.encryption) this.encryption = parent.encryption
const e = getEncryptionOption(opts)
if (!this.encryption) this.encryption = this._getEncryptionProvider(e)
this.writable = this._isWritable()
if (opts.valueEncoding) {
this.valueEncoding = c.from(opts.valueEncoding)
}
if (opts.encodeBatch) {
this.encodeBatch = opts.encodeBatch
}
// one session sets for pushOnly for all
if (opts.pushOnly === true) {
this.core.replicator.setPushOnly(true)
}
if (parent) {
if (parent._stateIndex === -1) await parent.ready()
if (!this.keyPair) this.keyPair = parent.keyPair
const ps = parent.state
if (ps) {
const shouldSnapshot = this.snapshotted && !ps.isSnapshot()
this.state = shouldSnapshot ? await ps.snapshot() : ps.ref()
}
if (this.snapshotted && this.core && !this._snapshot) {
this._updateSnapshot()
}
}
if (opts.exclusive && opts.writable !== false) {
this.exclusive = true
await this.core.lockExclusive()
}
const parentState = parent ? parent.state : this.core.state
const checkout = opts.checkout === undefined ? -1 : opts.checkout
const state = this.state
if (opts.atom) {
this.state = await parentState.createSession(null, false, opts.atom)
if (state) state.unref()
} else if (opts.name) {
// todo: need to make named sessions safe before ready
// atm we always copy the state in passCapabilities
this.state = await parentState.createSession(opts.name, !!opts.overwrite, null)
if (state) state.unref() // ref'ed above in setup session
}
if (this.state && checkout !== -1) {
if (!opts.name && !opts.atom) {
throw ASSERTION('Checkouts must be named or atomized', this.discoveryKey)
}
if (checkout > this.state.length) {
throw ASSERTION(
`Invalid checkout ${checkout} for ${opts.name}, length is ${this.state.length}`,
this.discoveryKey
)
}
if (this.state.prologue && checkout < this.state.prologue.length) {
throw ASSERTION(
`Invalid checkout ${checkout} for ${opts.name}, prologue length is ${this.state.prologue.length}`,
this.discoveryKey
)
}
if (checkout < this.state.length) await this.state.truncate(checkout, this.fork)
}
if (this.state === null) {
this.state = this.core.state.ref()
}
this.writable = this._isWritable()
if (this.snapshotted && this.core) this._updateSnapshot()
this.state.addSession(this)
// TODO: we need to rework the core reference flow, as the state and session do not always agree now due to moveTo
this.core = this.state.core // in case it was wrong...
if (opts.userData) {
const tx = this.state.storage.write()
for (const [key, value] of Object.entries(opts.userData)) {
tx.putUserData(key, value)
}
await tx.flush()
}
if (opts.manifest && !this.core.header.manifest) {
await this.core.setManifest(opts.manifest)
}
this.core.replicator.updateActivity(this._active ? 1 : 0)
this.opened = true
}
get replicator() {
return this.core === null ? null : this.core.replicator
}
_getSnapshot() {
return {
length: this.state.length,
byteLength: this.state.byteLength,
fork: this.state.fork
}
}
_updateSnapshot() {
const prev = this._snapshot
const next = (this._snapshot = this._getSnapshot())
if (!prev) return true
return prev.length !== next.length || prev.fork !== next.fork
}
_isWritable() {
if (this._readonly) return false
if (this.state && !this.state.isDefault()) return true
return !!(this.keyPair && this.keyPair.secretKey)
}
close({ error } = {}) {
if (this.closing) return this.closing
this.closing = this._close(error || null)
return this.closing
}
clearRequests(activeRequests, error) {
if (!activeRequests.length) return
if (this.core) this.core.replicator.clearRequests(activeRequests, error)
}
async _close(error) {
if (this.opened === false) {
try {
await this.opening
} catch (err) {
if (!this.closed) throw err
}
}
if (this.closed === true) return
this.core.removeMonitor(this)
this.state.removeSession(this)
this._removeSession()
this.readable = false
this.writable = false
this.opened = false
const gc = []
for (const ext of this.extensions.values()) {
if (ext.session === this) gc.push(ext)
}
for (const ext of gc) ext.destroy()
this.core.replicator.findingPeers -= this._findingPeers
this.core.replicator.clearRequests(this.activeRequests, error)
this.core.replicator.updateActivity(this._active ? -1 : 0)
this._findingPeers = 0
this.state.unref()
if (this.exclusive) this.core.unlockExclusive()
if (this.core.hasSession()) {
// emit "fake" close as this is a session
this.closed = true
this.emit('close')
return
}
if (this.core.autoClose) await this.core.close()
this.closed = true
this.emit('close')
}
async commit(session, opts) {
await this.ready()
await session.ready()
return this.state.commit(session.state, { keyPair: this.keyPair, ...opts })
}
replicate(isInitiator, opts = {}) {
// Only limitation here is that ondiscoverykey doesn't work atm when passing a muxer directly,
// because it doesn't really make a lot of sense.
if (Protomux.isProtomux(isInitiator)) return this._attachToMuxer(isInitiator)
// if same stream is passed twice, ignore the 2nd one before we make sessions etc
if (isStream(isInitiator) && this._isAttached(isInitiator)) return isInitiator
const protocolStream = Hypercore.createProtocolStream(isInitiator, opts)
const noiseStream = protocolStream.noiseStream
const protocol = noiseStream.userData
this._attachToMuxer(protocol)
return protocolStream
}
_isAttached(stream) {
return (
stream.userData &&
this.core &&
this.core.replicator &&
this.core.replicator.attached(stream.userData)
)
}
_attachToMuxer(mux) {
if (this.opened) {
this.core.replicator.attachTo(mux)
} else {
this.opening.then(() => this.core.replicator.attachTo(mux), mux.destroy.bind(mux))
}
return mux
}
get id() {
return this.core === null ? null : this.core.id
}
get key() {
return this.core === null ? null : this.core.key
}
get discoveryKey() {
return this.core === null ? null : this.core.discoveryKey
}
get manifest() {
return this.core === null ? null : this.core.manifest
}
getManifest({ raw = false } = {}) {
if (this.manifest === null) return null
return raw ? encodeManifest(this.manifest) : this.manifest
}
get length() {
if (this._snapshot) return this._snapshot.length
return this.opened === false ? 0 : this.state.length
}
get signedLength() {
return this.opened === false ? 0 : this.state.signedLength()
}
/**
* Deprecated. Use `const { byteLength } = await core.info()`.
*/
get byteLength() {
if (this.opened === false) return 0
if (this._snapshot) return this._snapshot.byteLength
return this.state.byteLength - this.state.length * this.padding
}
get remoteContiguousLength() {
if (this.opened === false) return 0
return Math.min(this.core.state.length, this.core.header.hints.remoteContiguousLength)
}
get contiguousLength() {
if (this.opened === false) return 0
return Math.min(this.core.state.length, this.core.header.hints.contiguousLength)
}
get contiguousByteLength() {
return 0
}
get fork() {
if (this.opened === false) return 0
return this.state.fork
}
get padding() {
if (this.encryption && this.key && this.manifest) {
return this.encryption.padding(this.core, this.length)
}
return 0
}
get peers() {
return this.opened === false ? [] : this.core.replicator.peers
}
get globalCache() {
return this.opened === false ? null : this.core.globalCache
}
get recovering() {
return this.opened === false ? 0 : this.core.header.hints.recovering
}
ready() {
return this.opening
}
async recover() {
if (this.opened === false) await this.opening
return this.state.waitForRecovery()
}
async setUserData(key, value) {
if (this.opened === false) await this.opening
const existing = await this.getUserData(key)
if (existing && b4a.isBuffer(value) && b4a.equals(existing, value)) return
await this.state.setUserData(key, value)
}
async getUserData(key) {
if (this.opened === false) await this.opening
const batch = this.state.storage.read()
const p = batch.getUserData(key)
batch.tryFlush()
return p
}
transferSession(core) {
// todo: validate we can move
if (this.weak === false) {
this.core.activeSessions--
core.activeSessions++
}
if (this._monitorIndex >= 0) {
this.core.removeMonitor(this)
core.addMonitor(this)
}
const old = this.core
this.core = core
old.replicator.clearRequests(this.activeRequests, SESSION_MOVED())
this.emit('migrate', this.key)
}
findingPeers() {
this._findingPeers++
if (this.core !== null && !this.closing) this.core.replicator.findingPeers++
let once = true
return () => {
if (this.closing || !once) return
once = false
this._findingPeers--
if (this.core !== null && --this.core.replicator.findingPeers === 0) {
this.core.replicator.queueUpdateAll()
}
}
}
async info(opts) {
if (this.opened === false) await this.opening
return Info.from(this, opts)
}
async update(opts) {
if (this.opened === false) await this.opening
if (this.closing !== null) return false
if (this.snapshotted) return false
if (this.writable && (!opts || opts.force !== true)) return false
const remoteWait = this._shouldWait(opts, this.core.replicator.findingPeers > 0)
let upgraded = false
if (await this.core.replicator.applyPendingReorg()) {
upgraded = true
}
if (!upgraded && remoteWait) {
const activeRequests = (opts && opts.activeRequests) || this.activeRequests
if (isRequestsDestroyed(activeRequests)) throw REQUEST_CANCELLED()
const req = this.core.replicator.addUpgrade(activeRequests)
try {
upgraded = await req.promise
} catch (err) {
if (isSessionMoved(err)) return this.update(opts)
throw err
}
}
if (!upgraded) return false
return true
}
async seek(bytes, opts) {
if (this.opened === false) await this.opening
if (!isValidIndex(bytes)) throw ASSERTION('seek is invalid', this.discoveryKey)
const activeRequests = (opts && opts.activeRequests) || this.activeRequests
if (isRequestsDestroyed(activeRequests)) throw REQUEST_CANCELLED()
if (this.encryption && !this.core.manifest) {
const req = this.replicator.addUpgrade(activeRequests)
try {
await req.promise
} catch (err) {
if (isSessionMoved(err)) return this.seek(bytes, opts)
throw err
}
}
const s = MerkleTree.seek(this.state, bytes, this.padding)
const offset = await s.update()
if (offset) return offset
if (this.closing !== null) {
throw SESSION_CLOSED('cannot seek on a closed session', this.discoveryKey)
}
if (!this._shouldWait(opts, this.wait)) return null
if (isRequestsDestroyed(activeRequests)) throw REQUEST_CANCELLED()
const req = this.core.replicator.addSeek(activeRequests, s)
const timeout = opts && opts.timeout !== undefined ? opts.timeout : this.timeout
if (timeout) req.context.setTimeout(req, timeout)
try {
return await req.promise
} catch (err) {
if (isSessionMoved(err)) return this.seek(bytes, opts)
throw err
}
}
async has(start, end = start + 1) {
if (this.opened === false) await this.opening
if (!isValidIndex(start) || !isValidIndex(end)) {
throw ASSERTION('has range is invalid', this.discoveryKey)
}
if (this.state.isDefault()) {
if (end === start + 1) return this.core.bitfield.get(start)
const i = this.core.bitfield.firstUnset(start)
return i === -1 || i >= end
}
if (end === start + 1) {
const rx = this.state.storage.read()
const block = rx.getBlock(start)
rx.tryFlush()
return (await block) !== null
}
let count = 0
const stream = this.state.storage.createBlockStream({ gte: start, lt: end })
for await (const block of stream) {
if (block === null) return false
count++
}
return count === end - start
}
async count(start, end) {
if (this.opened === false) await this.opening
if (!isValidIndex(start) || !isValidIndex(end)) {
throw ASSERTION('count range is invalid', this.discoveryKey)
}
if (this.state.isDefault()) return this.core.bitfield.countSet(start, end - start)
let count = 0
const stream = this.state.storage.createBlockStream({ gte: start, lt: end })
for await (const block of stream) {
if (block !== null) count++
}
return count
}
async get(index, opts) {
if (this.opened === false) await this.opening
if (!isValidIndex(index)) throw ASSERTION('block index is invalid', this.discoveryKey)
if (this.closing !== null) {
throw SESSION_CLOSED('cannot get on a closed session', this.discoveryKey)
}
const encoding =
(opts && opts.valueEncoding && c.from(opts.valueEncoding)) || this.valueEncoding
if (this.onseq !== null) this.onseq(index, this)
if (this._marking) await this.markBlock(index)
const req = this._get(index, opts)
let block = await req
if (!block) return null
if (opts && opts.raw) return block
if (this.encryption && (!opts || opts.decrypt !== false)) {
// Copy the block as it might be shared with other sessions.
block = b4a.from(block)
await this.encryption.decrypt(index, block, this.core)
}
return this._decode(encoding, block, index)
}
async clear(start, end = start + 1, opts) {
if (this.opened === false) await this.opening
if (this.closing !== null) {
throw SESSION_CLOSED('cannot clear on a closed session', this.discoveryKey)
}
if (typeof end === 'object') {
opts = end
end = start + 1
}
if (!isValidIndex(start) || !isValidIndex(end)) {
throw ASSERTION('clear range is invalid', this.discoveryKey)
}
const cleared = opts && opts.diff ? { blocks: 0 } : null
if (start >= end) return cleared
if (start >= this.length) return cleared
await this.state.clear(start, end, cleared)
return cleared
}
async purge() {
await this._closeAllSessions(null)
await this.core.purge()
}
async _get(index, opts) {
const block = await readBlock(this.state.storage.read(), index)
if (block !== null) return block
if (this.closing !== null) {
throw SESSION_CLOSED('cannot get on a closed session', this.discoveryKey)
}
// snapshot should check if core has block
if (this._snapshot !== null) {
checkSnapshot(this, index)
const coreBlock = await readBlock(this.core.state.storage.read(), index)
checkSnapshot(this, index)
if (coreBlock !== null) return coreBlock
}
// lets check the bitfield to see if we got it during the above async calls
// this is the last resort before replication, so always safe.
if (this.core.bitfield.get(index)) {
const coreBlock = await readBlock(this.state.storage.read(), index)
// TODO: this should not be needed, only needed atm in case we are doing a moveTo during this (we should fix)
if (coreBlock !== null) return coreBlock
}
if (!this._shouldWait(opts, this.wait)) return null
this.waits++
if (opts && opts.onwait) opts.onwait(index, this)
if (this.onwait) this.onwait(index, this)
const activeRequests = (opts && opts.activeRequests) || this.activeRequests
if (isRequestsDestroyed(activeRequests)) throw REQUEST_CANCELLED()
const force = opts ? opts.force === true : false
const req = this.core.replicator.addBlock(activeRequests, index, force)
req.snapshot = index < this.length