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index.js
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const pathRoot = require('path')
const path = pathRoot.posix || pathRoot
const { EventEmitter } = require('events')
const collect = require('stream-collector')
const thunky = require('thunky')
const ThunkyMap = require('thunky-map')
const unixify = require('unixify')
const duplexify = require('duplexify')
const pump = require('pump')
const pumpify = require('pumpify')
const { Transform } = require('streamx')
const coreByteStream = require('ddatabase-byte-stream')
const Nanoresource = require('nanoresource/emitter')
const HypercoreProtocol = require('ddatabase-protocol')
const MountableHypertrie = require('mountable-dwebtrie')
const DWebstore = require('dwebstore')
const { Stat } = require('ddrive-schemas')
const createFileDescriptor = require('./lib/fd')
const errors = require('./lib/errors')
const defaultCorestore = require('./lib/storage')
const TagManager = require('./lib/tagging')
const HyperdrivePromises = require('./promises')
const { contentKeyPair, contentOptions, ContentState } = require('./lib/content')
const { statIterator, createStatStream, createMountStream, createReaddirStream, readdirIterator } = require('./lib/iterator')
const Pumpify = require('pumpify')
// 20 is arbitrary, just to make the fds > stdio etc
const STDIO_CAP = 20
const WRITE_STREAM_BLOCK_SIZE = 524288
const NOOP_FILE_PATH = ' '
module.exports = (...args) => new DDrive(...args)
module.exports.constants = require('filesystem-constants').linux
class DDrive extends Nanoresource {
constructor (storage, key, opts) {
super()
if (isObject(key)) {
opts = key
key = null
}
if (!opts) opts = {}
this.opts = opts
this.key = key
this.discoveryKey = null
this.live = true
this.sparse = opts.sparse !== false
this.sparseMetadata = opts.sparseMetadata !== false
this.promises = new HyperdrivePromises(this)
this._namespace = opts.namespace
this.dwebstore = defaultCorestore(storage, {
...opts,
valueEncoding: 'binary',
// TODO: Support mixed sparsity.
sparse: this.sparse || this.sparseMetadata,
extensions: opts.extensions
})
if (this.dwebstore !== storage) this.dwebstore.on('error', err => this.emit('error', err))
if (opts.namespace) {
this.dwebstore = this.dwebstore.namespace(opts.namespace)
}
// Set in ready.
this.metadata = null
this.db = opts._db
this.tags = new TagManager(this)
this.isCheckout = !!this.db
this._contentStates = opts._contentStates || new ThunkyMap(this._contentStateFromMetadata.bind(this))
this._fds = []
this._writingFds = new Map()
this._unlistens = []
this._unmirror = null
this._metadataOpts = {
key,
sparse: this.sparseMetadata,
keyPair: opts.keyPair,
extensions: opts.extensions
}
this.ready(onReady)
const self = this
function onReady (err) {
if (err) return self.emit('error', err)
self.emit('ready')
if (self._contentStates.has(self.db.feed)) return
self._getContent(self.db.feed, noop)
}
}
get version () {
// TODO: The trie version starts at 1, so the empty ddrive version is also 1. This should be 0.
return this.db.version
}
get writable () {
return this.metadata.writable
}
get contentWritable () {
const contentState = this._contentStates.cache.get(this.db.feed)
if (!contentState) return false
return contentState.feed.writable
}
ready (cb) {
return this.open(cb)
}
_open (cb) {
const self = this
return this.dwebstore.ready(err => {
if (err) return cb(err)
this.metadata = this.dwebstore.default(this._metadataOpts)
this.db = this.db || new MountableHypertrie(this.dwebstore, this.key, {
feed: this.metadata,
sparse: this.sparseMetadata,
extension: this.opts.extension !== false
})
this.db.on('dwebtrie', onhypertrie)
this.db.on('error', onerror)
self.metadata.on('error', onerror)
self.metadata.on('append', update)
self.metadata.on('extension', extension)
self.metadata.on('peer-add', peeradd)
self.metadata.on('peer-open', peeropen)
self.metadata.on('peer-remove', peerremove)
this._unlistens.push(() => {
self.db.removeListener('error', onerror)
self.db.removeListener('dwebtrie', onhypertrie)
self.metadata.removeListener('error', onerror)
self.metadata.removeListener('append', update)
self.metadata.removeListener('extension', extension)
self.metadata.removeListener('peer-add', peeradd)
self.metadata.removeListener('peer-open', peeropen)
self.metadata.removeListener('peer-remove', peerremove)
})
return self.metadata.ready(err => {
if (err) return done(err)
/**
* TODO: Update comment to reflect mounts.
*
* If a db is provided as input, ensure that a contentFeed is also provided, then return (this is a checkout).
* If the metadata feed is writable:
* If the metadata feed has length 0, then the db should be initialized with the content feed key as metadata.
* Else, initialize the db without metadata and load the content feed key from the header.
* If the metadata feed is readable:
* Initialize the db without metadata and load the content feed key from the header.
*/
if (self.metadata.writable && !self.metadata.length && !self.isCheckout) {
initialize()
} else {
restore()
}
})
})
/**
* The first time the ddrive is created, we initialize both the db (metadata feed) and the content feed here.
*/
function initialize () {
self._contentStateFromKey(null, (err, contentState) => {
if (err) return done(err)
// warm up the thunky map
self._contentStates.cache.set(self.db.feed, contentState)
self.db.setMetadata(contentState.feed.key)
self.db.ready(err => {
if (err) return done(err)
return done(null)
})
})
}
/**
* If the ddrive has already been created, wait for the db (metadata feed) to load.
* If the metadata feed is writable, we can immediately load the content feed from its private key.
* (Otherwise, we need to read the feed's metadata block first)
*/
function restore (keyPair) {
self.db.ready(err => {
if (err) return done(err)
self.metadata.has(0, (err, hasMetadataBlock) => {
if (err) return done(err)
if (hasMetadataBlock) self._getContent(self.db.feed, done)
else done(null)
})
})
}
function done (err) {
if (err) return cb(err)
self.key = self.metadata.key
self.discoveryKey = self.metadata.discoveryKey
return cb(null)
}
function onerror (err) {
if (err) self.emit('error', err)
return cb(err)
}
function update () {
self.emit('update')
}
function extension(name, message, peer) {
self.emit('extension', name, message, peer)
}
function peeradd(peer) {
self.emit('peer-add', peer)
}
function peeropen(peer) {
self.emit('peer-open', peer)
}
function peerremove(peer) {
self.emit('peer-remove', peer)
}
function onhypertrie (trie) {
self.emit('metadata-feed', trie.feed)
self.emit('mount', trie)
}
}
_getContent (metadata, cb) {
this._contentStates.get(metadata, cb)
}
_contentStateFromMetadata (metadata, cb) {
MountableHypertrie.getMetadata(metadata, (err, publicKey) => {
if (err) return cb(err)
this._contentStateFromKey(publicKey, cb)
})
}
_contentStateFromKey (publicKey, cb) {
const contentOpts = { key: publicKey, ...contentOptions(this), cache: { data: false } }
try {
var feed = this.dwebstore.get(contentOpts)
} catch (err) {
return cb(err)
}
const contentErrorListener = err => this.emit('error', err)
feed.on('error', contentErrorListener)
this._unlistens.push(() => feed.removeListener('error', contentErrorListener))
feed.ready(err => {
if (err) return cb(err)
this.emit('content-feed', feed)
return cb(null, new ContentState(feed))
})
}
_putStat (name, stat, opts, cb) {
if (typeof opts === 'function') return this._putStat(name, stat, null, opts)
try {
var encoded = stat.encode()
} catch (err) {
return cb(err)
}
this.db.put(name, encoded, opts, err => {
if (err) return cb(err)
return cb(null, stat)
})
}
_update (name, stat, cb) {
name = fixName(name)
this.db.get(name, (err, st) => {
if (err) return cb(err)
if (!st) return cb(new errors.FileNotFound(name))
try {
var decoded = Stat.decode(st.value)
} catch (err) {
return cb(err)
}
const oldMetadata = decoded.metadata
const newStat = Object.assign(decoded, stat)
if (stat.metadata) {
newStat.metadata = Object.assign({}, oldMetadata || {}, stat.metadata)
}
return this._putStat(name, newStat, { flags: st.flags }, cb)
})
}
_upsert (name, stat, cb) {
name = fixName(name)
this.db.get(name, (err, st) => {
if (err) return cb(err)
if (!st) {
var decoded = Stat.file()
}
else {
try {
var decoded = Stat.decode(st.value)
} catch (err) {
return cb(err)
}
}
const oldMetadata = decoded.metadata
const newStat = Object.assign(decoded, stat)
if (stat.metadata) {
newStat.metadata = Object.assign({}, oldMetadata || {}, stat.metadata)
}
return this._putStat(name, newStat, { flags: st ? st.flags : 0 }, cb)
})
}
getContent (cb) {
if (!this.db) return cb(null, null)
this._getContent(this.db.feed, (err, contentState) => {
if (err) return cb(err)
return cb(null, contentState.feed)
})
}
open (name, flags, cb) {
if (!name || typeof name === 'function') return super.open(name)
name = fixName(name)
this.ready(err => {
if (err) return cb(err)
createFileDescriptor(this, name, flags, (err, fd) => {
if (err) return cb(err)
cb(null, STDIO_CAP + (this._fds.push(fd) - 1) * 2)
})
})
}
read (fd, buf, offset, len, pos, cb) {
if (typeof pos === 'function') {
cb = pos
pos = null
}
const desc = this._fds[(fd - STDIO_CAP) / 2]
if (!desc) return process.nextTick(cb, new errors.BadFileDescriptor(`Bad file descriptor: ${fd}`))
if (pos == null) pos = desc.position
desc.read(buf, offset, len, pos, cb)
}
write (fd, buf, offset, len, pos, cb) {
if (typeof pos === 'function') {
cb = pos
pos = null
}
const desc = this._fds[(fd - STDIO_CAP) / 2]
if (!desc) return process.nextTick(cb, new errors.BadFileDescriptor(`Bad file descriptor: ${fd}`))
if (pos == null) pos = desc.position
desc.write(buf, offset, len, pos, cb)
}
createReadStream (name, opts) {
if (!opts) opts = {}
const self = this
name = fixName(name)
const length = typeof opts.end === 'number' ? 1 + opts.end - (opts.start || 0) : typeof opts.length === 'number' ? opts.length : -1
const stream = coreByteStream({
...opts,
highWaterMark: opts.highWaterMark || 64 * 1024
})
this.ready(err => {
if (err) return stream.destroy(err)
return this.stat(name, { file: true }, (err, st, trie) => {
if (err) return stream.destroy(err)
if (st.mount && st.mount.ddatabase) {
const feed = self.dwebstore.get({
key: st.mount.key,
sparse: self.sparse
})
return feed.ready(err => {
if (err) return stream.destroy(err)
st.blocks = feed.length
return oncontent(st, { feed })
})
}
return this._getContent(trie.feed, (err, contentState) => {
if (err) return stream.destroy(err)
return oncontent(st, contentState)
})
})
})
function oncontent (st, contentState) {
if (st.mount && st.mount.ddatabase) {
var byteOffset = 0
var blockOffset = 0
var blockLength = st.blocks
} else {
blockOffset = st.offset
blockLength = st.blocks
byteOffset = opts.start ? st.byteOffset + opts.start : (length === -1 ? -1 : st.byteOffset)
}
const byteLength = Math.min(length, st.size)
stream.start({
feed: contentState.feed,
blockOffset,
blockLength,
byteOffset,
byteLength
})
}
return stream
}
createDiffStream (other, prefix, opts) {
if (other instanceof DDrive) other = other.version
if (typeof prefix === 'object') return this.createDiffStream(other, '/', prefix)
prefix = prefix || '/'
const diffStream = this.db.createDiffStream(other, prefix, opts)
return pumpify.obj(
diffStream,
new Transform({
transform (chunk, cb) {
const entry = { type: chunk.type, name: chunk.key }
if (chunk.left) entry.seq = chunk.left.seq
if (chunk.right) entry.previous = { seq: chunk.right.seq }
if (chunk.left && entry.type !== 'mount' && entry.type !== 'unmount') {
try {
entry.value = Stat.decode(chunk.left.value)
} catch (err) {
return cb(err)
}
} else if (chunk.left) {
entry.value = chunk.left.info
}
return cb(null, entry)
}
})
)
}
createDirectoryStream (name, opts) {
if (!opts) opts = {}
name = fixName(name)
return createReaddirStream(this, name, {
...opts,
includeStats: true
})
}
createWriteStream (name, opts) {
if (!opts) opts = {}
name = fixName(name)
const self = this
var release
const proxy = duplexify()
proxy.setReadable(false)
// TODO: support piping through a "split" stream like rabin
this.ready(err => {
if (err) return proxy.destroy(err)
this.stat(name, { trie: true }, (err, stat, trie) => {
if (err && (err.errno !== 2)) return proxy.destroy(err)
this._getContent(trie.feed, (err, contentState) => {
if (err) return proxy.destroy(err)
if (opts.wait === false && contentState.isLocked()) return cb(new Error('Content is locked.'))
contentState.lock(_release => {
release = _release
append(contentState)
})
})
})
})
return proxy
function append (contentState) {
if (proxy.destroyed) return release()
const byteOffset = contentState.feed.byteLength
const offset = contentState.feed.length
self.emit('appending', name, opts)
// TODO: revert the content feed if this fails!!!! (add an option to the write stream for this (atomic: true))
const stream = contentState.feed.createWriteStream({ maxBlockSize: WRITE_STREAM_BLOCK_SIZE })
proxy.on('close', ondone)
proxy.on('finish', ondone)
proxy.setWritable(stream)
proxy.on('prefinish', function () {
const stat = Stat.file({
...opts,
offset,
byteOffset,
size: contentState.feed.byteLength - byteOffset,
blocks: contentState.feed.length - offset
})
proxy.cork()
self._putStat(name, stat, function (err) {
if (err) return proxy.destroy(err)
self.emit('append', name, opts)
proxy.uncork()
})
})
}
function ondone () {
proxy.removeListener('close', ondone)
proxy.removeListener('finish', ondone)
release()
}
}
create (name, opts, cb) {
if (typeof opts === 'function') return this.create(name, null, opts)
name = fixName(name)
this.ready(err => {
if (err) return cb(err)
this.lstat(name, { file: true, trie: true }, (err, stat) => {
if (err && err.errno !== 2) return cb(err)
if (stat) return cb(null, stat)
const st = Stat.file(opts)
return this._putStat(name, st, cb)
})
})
}
readFile (name, opts, cb) {
if (typeof opts === 'function') return this.readFile(name, null, opts)
if (typeof opts === 'string') opts = { encoding: opts }
if (!opts) opts = {}
name = fixName(name)
collect(this.createReadStream(name, opts), function (err, bufs) {
if (err) return cb(err)
let buf = bufs.length === 1 ? bufs[0] : Buffer.concat(bufs)
cb(null, opts.encoding && opts.encoding !== 'binary' ? buf.toString(opts.encoding) : buf)
})
}
writeFile (name, buf, opts, cb) {
if (typeof opts === 'function') return this.writeFile(name, buf, null, opts)
if (typeof opts === 'string') opts = { encoding: opts }
if (!opts) opts = {}
if (typeof buf === 'string') buf = Buffer.from(buf, opts.encoding || 'utf-8')
if (!cb) cb = noop
name = fixName(name)
// Make sure that the buffer is chunked into blocks of 0.5MB.
let stream = this.createWriteStream(name, opts)
// TODO: Do we need to maintain the error state? What's triggering 'finish' after 'error'?
var errored = false
stream.on('error', err => {
errored = true
return cb(err)
})
stream.on('finish', () => {
if (!errored) return cb(null)
})
stream.end(buf)
}
truncate (name, size, cb) {
name = fixName(name)
this.lstat(name, { file: true, trie: true }, (err, st) => {
if (err && err.errno !== 2) return cb(err)
if (!st || !size) return this.create(name, cb)
if (size === st.size) return cb(null)
if (size < st.size) {
const readStream = this.createReadStream(name, { length: size })
const writeStream = this.createWriteStream(name)
return pump(readStream, writeStream, cb)
} else {
this.open(name, 'a', (err, fd) => {
if (err) return cb(err)
const length = size - st.size
this.write(fd, Buffer.alloc(length), 0, length, st.size, err => {
if (err) return cb(err)
this.close(fd, cb)
})
})
}
})
}
ftruncate (fd, size, cb) {
const desc = this._fds[(fd - STDIO_CAP) / 2]
if (!desc) return process.nextTick(cb, new errors.BadFileDescriptor(`Bad file descriptor: ${fd}`))
return desc.truncate(size, cb)
}
_createStat (name, opts, cb) {
const self = this
const statConstructor = (opts && opts.directory) ? Stat.directory : Stat.file
const shouldForce = !!opts.force
this.ready(err => {
if (err) return cb(err)
this.db.get(name, (err, node, trie) => {
if (err) return cb(err)
if (node && !shouldForce) return cb(new errors.PathAlreadyExists(name))
onexisting(node, trie)
})
})
function onexisting (node, trie) {
self.ready(err => {
if (err) return cb(err)
self._getContent(trie.feed, (err, contentState) => {
if (err) return cb(err)
const st = statConstructor({
...opts,
offset: contentState.feed.length,
byteOffset: contentState.feed.byteLength
})
return cb(null, st)
})
})
}
}
mkdir (name, opts, cb) {
if (typeof opts === 'function') return this.mkdir(name, null, opts)
if (typeof opts === 'number') opts = { mode: opts }
if (!opts) opts = {}
if (!cb) cb = noop
name = fixName(name)
opts.directory = true
this._createStat(name, opts, (err, st) => {
if (err) return cb(err)
this._putStat(name, st, {
condition: ifNotExists
}, cb)
})
}
_statDirectory (name, opts, cb) {
const ite = this.db.iterator(name)
ite.next((err, st) => {
if (err) return cb(err)
if (name !== '/' && !st) return cb(new errors.FileNotFound(name))
if (name === '/') return cb(null, Stat.directory(), this.db)
const trie = st[MountableHypertrie.Symbols.TRIE]
const mount = st[MountableHypertrie.Symbols.MOUNT]
const innerPath = st[MountableHypertrie.Symbols.INNER_PATH]
try {
st = Stat.decode(st.value)
} catch (err) {
return cb(err)
}
const noMode = Object.assign({}, st, { mode: 0 })
return cb(null, Stat.directory(noMode), trie, mount, innerPath)
})
}
readlink (name, cb) {
this.lstat(name, function (err, st) {
if (err) return cb(err)
cb(null, st.linkname)
})
}
lstat (name, opts, cb) {
if (typeof opts === 'function') return this.lstat(name, null, opts)
if (!opts) opts = {}
const self = this
name = fixName(name)
this.ready(err => {
if (err) return cb(err)
this.db.get(name, opts, onstat)
})
function onstat (err, node, trie, mount, mountPath) {
if (err) return cb(err)
if (!node && opts.trie) return cb(null, null, trie, mount, mountPath)
if (!node && opts.file) return cb(new errors.FileNotFound(name))
if (!node) return self._statDirectory(name, opts, cb)
try {
var st = Stat.decode(node.value)
} catch (err) {
return cb(err)
}
const writingFd = self._writingFds.get(name)
if (writingFd) {
st.size = writingFd.stat.size
}
cb(null, st, trie, mount, mountPath)
}
}
stat (name, opts, cb) {
if (typeof opts === 'function') return this.stat(name, null, opts)
if (!opts) opts = {}
this.lstat(name, opts, (err, stat, trie, mount, mountPath) => {
if (err) return cb(err)
if (!stat) return cb(null, null, trie, name, mount, mountPath)
if (stat.linkname) {
if (path.isAbsolute(stat.linkname)) return this.stat(stat.linkname, opts, cb)
const relativeStat = path.resolve('/', path.dirname(name), stat.linkname)
return this.stat(relativeStat, opts, cb)
}
return cb(null, stat, trie, name, mount, mountPath)
})
}
info (name, cb) {
name = fixName(name)
const noopPath = path.join(name, NOOP_FILE_PATH)
this.stat(noopPath, { trie: true }, (err, stat, trie, _, mountInfo, mountPath) => {
if (err) return cb(err)
return cb(null, {
feed: trie.feed,
mountPath: fixName(noopPath.slice(0, noopPath.length - mountPath.length)),
mountInfo
})
})
}
access (name, opts, cb) {
if (typeof opts === 'function') return this.access(name, null, opts)
if (!opts) opts = {}
name = fixName(name)
this.stat(name, opts, err => {
cb(err)
})
}
exists (name, opts, cb) {
if (typeof opts === 'function') return this.exists(name, null, opts)
if (!opts) opts = {}
this.access(name, opts, err => {
cb(!err)
})
}
readdir (name, opts, cb) {
if (typeof opts === 'function') return this.readdir(name, null, opts)
name = fixName(name)
const readdirStream = createReaddirStream(this, name, opts)
return collect(readdirStream, (err, entries) => {
if (err) return cb(err)
return cb(null, entries)
})
}
_del (name, cb) {
this.ready(err => {
if (err) return cb(err)
this.db.del(name, (err, node) => {
if (err) return cb(err)
if (!node) return cb(new errors.FileNotFound(name))
return cb(null)
})
})
}
unlink (name, cb) {
name = fixName(name)
this._del(name, cb || noop)
}
rmdir (name, cb) {
if (!cb) cb = noop
name = fixName(name)
const self = this
const ite = readdirIterator(this, name)
ite.next((err, val) => {
if (err) return cb(err)
if (val) return cb(new errors.DirectoryNotEmpty(name))
self._del(name, cb)
})
}
replicate (isInitiator, opts) {
// support replicate({ initiator: bool }) also
if (typeof isInitiator === 'object' && isInitiator && !opts) {
opts = isInitiator
isInitiator = !!opts.initiator
}
const stream = (opts && opts.stream) || new HypercoreProtocol(isInitiator, { ...opts })
this.ready(err => {
if (err) return stream.destroy(err)
this.dwebstore.replicate(isInitiator, { ...opts, stream })
})
return stream
}
checkout (version, opts) {
opts = {
...opts,
_db: this.db.checkout(version),
_contentStates: this._contentStates,
}
return new DDrive(this.dwebstore, this.key, opts)
}
_closeFile (fd, cb) {
const idx = (fd - STDIO_CAP) / 2
const desc = this._fds[idx]
if (!desc) return process.nextTick(cb, new Error('Invalid file descriptor'))
this._fds[idx] = null
while (this._fds.length && !this._fds[this._fds.length - 1]) this._fds.pop()
desc.close(cb)
}
_close (cb) {
this.db.close(err => {
for (const unlisten of this._unlistens) {
unlisten()
}
this._unlistens = []
this.emit('close')
cb(err)
})
}
close (fd, cb) {
if (typeof fd === 'number') return this._closeFile(fd, cb || noop)
super.close(false, fd)
}
destroyStorage (cb) {
const metadata = this.db.feed
this._getContent(metadata, (err, contentState) => {
const content = contentState.feed
metadata.destroyStorage(() => {
content.destroyStorage(() => {
this.close(cb)
})
})
})
}
stats (path, opts, cb) {
if (typeof opts === 'function') return this.stats(path, null, opts)
const self = this
const stats = new Map()
this.stat(path, (err, stat, trie) => {
if (err) return cb(err)
if (stat.isFile()) {
return fileStats(path, cb)
} else {
const recursive = opts && (opts.recursive !== false)
const ite = statIterator(self, path, { recursive })
return ite.next(function loop (err, info) {
if (err) return cb(err)
if (!info) return cb(null, stats)
fileStats(info.path, (err, fileStats) => {
if (err && err.errno !== 2) return cb(err)
if (!fileStats) return ite.next(loop)
stats.set(info.path, fileStats)
return ite.next(loop)
})
})
}
})
function onstats (err, path, fileStats) {
if (err) return cb(err)
stats.set(path, fileStats)
}
function fileStats (path, cb) {
const total = emptyStats()
return self.stat(path, (err, stat, trie) => {
if (err) return cb(err)
return self._getContent(trie.feed, (err, contentState) => {
if (err) return cb(err)
contentState.feed.downloaded(stat.offset, stat.offset + stat.blocks, (err, downloadedBlocks) => {
if (err) return cb(err)
total.blocks = stat.blocks
total.size = stat.size
total.downloadedBlocks = downloadedBlocks
// TODO: This is not possible to implement now. Need a better byte length index in ddatabase.
// total.downloadedBytes = 0
return cb(null, total)
})
})
})
}
function emptyStats () {
return {
blocks: 0,
size: 0,
downloadedBlocks: 0,
}
}
}
watchStats (path, opts) {
const self = this
var timer = setInterval(collectStats, (opts && opts.statsInveral) || 2000)
var collecting = false
var destroyed = false
const handle = new EventEmitter()
Object.assign(handle, {
destroy
})
return handle
function collectStats () {
if (collecting) return
collecting = true
self.stats(path, opts, (err, stats) => {
if (err) return destroy(err)
collecting = false
handle.stats = stats
handle.emit('update')
})
}
function destroy (err) {
handle.emit('destroy', err)
clearInterval(timer)
destroyed = true
}
}
mirror () {
const self = this
if (this._unmirror) return this._unmirror
const mirrorRanges = new Map()
this.on('content-feed', oncore)
this.on('metadata-feed', oncore)
this.getAllMounts({ content: true }, (err, mounts) => {
if (err) return this.emit('error', err)
for (const { metadata, content } of mounts.values()) {
oncore(metadata)
oncore(content)
}
})
this._unmirror = unmirror
return this._unmirror
function unmirror () {
if (!self._unmirror) return
self._unmirror = null
self.removeListener('content-feed', oncore)
self.removeListener('metadata-feed', oncore)
for (const [ core, range ] of mirrorRanges) {
core.undownload(range)
}
}
function oncore (core) {
if (!core) return
if (!self._unmirror || self._unmirror !== unmirror || mirrorRanges.has(core)) return
mirrorRanges.set(core, core.download({ start: 0, end: -1 }))
}
}
clear (path, opts, cb) {
if (typeof opts === 'function') {
cb = opts