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Edit File : get.js \| Size : 6.71 KB
'use strict' const BB = require('bluebird') const figgyPudding = require('figgy-pudding') const fs = require('fs') const index = require('./lib/entry-index') const memo = require('./lib/memoization') const pipe = require('mississippi').pipe const pipeline = require('mississippi').pipeline const read = require('./lib/content/read') const through = require('mississippi').through const GetOpts = figgyPudding({ integrity: {}, memoize: {}, size: {} }) module.exports = function get (cache, key, opts) { return getData(false, cache, key, opts) } module.exports.byDigest = function getByDigest (cache, digest, opts) { return getData(true, cache, digest, opts) } function getData (byDigest, cache, key, opts) { opts = GetOpts(opts) const memoized = ( byDigest ? memo.get.byDigest(cache, key, opts) : memo.get(cache, key, opts) ) if (memoized && opts.memoize !== false) { return BB.resolve(byDigest ? memoized : { metadata: memoized.entry.metadata, data: memoized.data, integrity: memoized.entry.integrity, size: memoized.entry.size }) } return ( byDigest ? BB.resolve(null) : index.find(cache, key, opts) ).then(entry => { if (!entry && !byDigest) { throw new index.NotFoundError(cache, key) } return read(cache, byDigest ? key : entry.integrity, { integrity: opts.integrity, size: opts.size }).then(data => byDigest ? data : { metadata: entry.metadata, data: data, size: entry.size, integrity: entry.integrity }).then(res => { if (opts.memoize && byDigest) { memo.put.byDigest(cache, key, res, opts) } else if (opts.memoize) { memo.put(cache, entry, res.data, opts) } return res }) }) } module.exports.sync = function get (cache, key, opts) { return getDataSync(false, cache, key, opts) } module.exports.sync.byDigest = function getByDigest (cache, digest, opts) { return getDataSync(true, cache, digest, opts) } function getDataSync (byDigest, cache, key, opts) { opts = GetOpts(opts) const memoized = ( byDigest ? memo.get.byDigest(cache, key, opts) : memo.get(cache, key, opts) ) if (memoized && opts.memoize !== false) { return byDigest ? memoized : { metadata: memoized.entry.metadata, data: memoized.data, integrity: memoized.entry.integrity, size: memoized.entry.size } } const entry = !byDigest && index.find.sync(cache, key, opts) if (!entry && !byDigest) { throw new index.NotFoundError(cache, key) } const data = read.sync( cache, byDigest ? key : entry.integrity, { integrity: opts.integrity, size: opts.size } ) const res = byDigest ? data : { metadata: entry.metadata, data: data, size: entry.size, integrity: entry.integrity } if (opts.memoize && byDigest) { memo.put.byDigest(cache, key, res, opts) } else if (opts.memoize) { memo.put(cache, entry, res.data, opts) } return res } module.exports.stream = getStream function getStream (cache, key, opts) { opts = GetOpts(opts) let stream = through() const memoized = memo.get(cache, key, opts) if (memoized && opts.memoize !== false) { stream.on('newListener', function (ev, cb) { ev === 'metadata' && cb(memoized.entry.metadata) ev === 'integrity' && cb(memoized.entry.integrity) ev === 'size' && cb(memoized.entry.size) }) stream.write(memoized.data, () => stream.end()) return stream } index.find(cache, key).then(entry => { if (!entry) { return stream.emit( 'error', new index.NotFoundError(cache, key) ) } let memoStream if (opts.memoize) { let memoData = [] let memoLength = 0 memoStream = through((c, en, cb) => { memoData && memoData.push(c) memoLength += c.length cb(null, c, en) }, cb => { memoData && memo.put(cache, entry, Buffer.concat(memoData, memoLength), opts) cb() }) } else { memoStream = through() } stream.emit('metadata', entry.metadata) stream.emit('integrity', entry.integrity) stream.emit('size', entry.size) stream.on('newListener', function (ev, cb) { ev === 'metadata' && cb(entry.metadata) ev === 'integrity' && cb(entry.integrity) ev === 'size' && cb(entry.size) }) pipe( read.readStream(cache, entry.integrity, opts.concat({ size: opts.size == null ? entry.size : opts.size })), memoStream, stream ) }).catch(err => stream.emit('error', err)) return stream } module.exports.stream.byDigest = getStreamDigest function getStreamDigest (cache, integrity, opts) { opts = GetOpts(opts) const memoized = memo.get.byDigest(cache, integrity, opts) if (memoized && opts.memoize !== false) { const stream = through() stream.write(memoized, () => stream.end()) return stream } else { let stream = read.readStream(cache, integrity, opts) if (opts.memoize) { let memoData = [] let memoLength = 0 const memoStream = through((c, en, cb) => { memoData && memoData.push(c) memoLength += c.length cb(null, c, en) }, cb => { memoData && memo.put.byDigest( cache, integrity, Buffer.concat(memoData, memoLength), opts ) cb() }) stream = pipeline(stream, memoStream) } return stream } } module.exports.info = info function info (cache, key, opts) { opts = GetOpts(opts) const memoized = memo.get(cache, key, opts) if (memoized && opts.memoize !== false) { return BB.resolve(memoized.entry) } else { return index.find(cache, key) } } module.exports.hasContent = read.hasContent module.exports.copy = function cp (cache, key, dest, opts) { return copy(false, cache, key, dest, opts) } module.exports.copy.byDigest = function cpDigest (cache, digest, dest, opts) { return copy(true, cache, digest, dest, opts) } function copy (byDigest, cache, key, dest, opts) { opts = GetOpts(opts) if (read.copy) { return ( byDigest ? BB.resolve(null) : index.find(cache, key, opts) ).then(entry => { if (!entry && !byDigest) { throw new index.NotFoundError(cache, key) } return read.copy( cache, byDigest ? key : entry.integrity, dest, opts ).then(() => byDigest ? key : { metadata: entry.metadata, size: entry.size, integrity: entry.integrity }) }) } else { return getData(byDigest, cache, key, opts).then(res => { return fs.writeFileAsync(dest, byDigest ? res : res.data) .then(() => byDigest ? key : { metadata: res.metadata, size: res.size, integrity: res.integrity }) }) } } Back

Edit File : get.js | Size : 6.71 KB

'use strict'

const BB = require('bluebird')

const figgyPudding = require('figgy-pudding')
const fs = require('fs')
const index = require('./lib/entry-index')
const memo = require('./lib/memoization')
const pipe = require('mississippi').pipe
const pipeline = require('mississippi').pipeline
const read = require('./lib/content/read')
const through = require('mississippi').through

const GetOpts = figgyPudding({
  integrity: {},
  memoize: {},
  size: {}
})

module.exports = function get (cache, key, opts) {
  return getData(false, cache, key, opts)
}
module.exports.byDigest = function getByDigest (cache, digest, opts) {
  return getData(true, cache, digest, opts)
}
function getData (byDigest, cache, key, opts) {
  opts = GetOpts(opts)
  const memoized = (
    byDigest
      ? memo.get.byDigest(cache, key, opts)
      : memo.get(cache, key, opts)
  )
  if (memoized && opts.memoize !== false) {
    return BB.resolve(byDigest ? memoized : {
      metadata: memoized.entry.metadata,
      data: memoized.data,
      integrity: memoized.entry.integrity,
      size: memoized.entry.size
    })
  }
  return (
    byDigest ? BB.resolve(null) : index.find(cache, key, opts)
  ).then(entry => {
    if (!entry && !byDigest) {
      throw new index.NotFoundError(cache, key)
    }
    return read(cache, byDigest ? key : entry.integrity, {
      integrity: opts.integrity,
      size: opts.size
    }).then(data => byDigest ? data : {
      metadata: entry.metadata,
      data: data,
      size: entry.size,
      integrity: entry.integrity
    }).then(res => {
      if (opts.memoize && byDigest) {
        memo.put.byDigest(cache, key, res, opts)
      } else if (opts.memoize) {
        memo.put(cache, entry, res.data, opts)
      }
      return res
    })
  })
}

module.exports.sync = function get (cache, key, opts) {
  return getDataSync(false, cache, key, opts)
}
module.exports.sync.byDigest = function getByDigest (cache, digest, opts) {
  return getDataSync(true, cache, digest, opts)
}
function getDataSync (byDigest, cache, key, opts) {
  opts = GetOpts(opts)
  const memoized = (
    byDigest
      ? memo.get.byDigest(cache, key, opts)
      : memo.get(cache, key, opts)
  )
  if (memoized && opts.memoize !== false) {
    return byDigest ? memoized : {
      metadata: memoized.entry.metadata,
      data: memoized.data,
      integrity: memoized.entry.integrity,
      size: memoized.entry.size
    }
  }
  const entry = !byDigest && index.find.sync(cache, key, opts)
  if (!entry && !byDigest) {
    throw new index.NotFoundError(cache, key)
  }
  const data = read.sync(
    cache,
    byDigest ? key : entry.integrity,
    {
      integrity: opts.integrity,
      size: opts.size
    }
  )
  const res = byDigest
    ? data
    : {
      metadata: entry.metadata,
      data: data,
      size: entry.size,
      integrity: entry.integrity
    }
  if (opts.memoize && byDigest) {
    memo.put.byDigest(cache, key, res, opts)
  } else if (opts.memoize) {
    memo.put(cache, entry, res.data, opts)
  }
  return res
}

module.exports.stream = getStream
function getStream (cache, key, opts) {
  opts = GetOpts(opts)
  let stream = through()
  const memoized = memo.get(cache, key, opts)
  if (memoized && opts.memoize !== false) {
    stream.on('newListener', function (ev, cb) {
      ev === 'metadata' && cb(memoized.entry.metadata)
      ev === 'integrity' && cb(memoized.entry.integrity)
      ev === 'size' && cb(memoized.entry.size)
    })
    stream.write(memoized.data, () => stream.end())
    return stream
  }
  index.find(cache, key).then(entry => {
    if (!entry) {
      return stream.emit(
        'error', new index.NotFoundError(cache, key)
      )
    }
    let memoStream
    if (opts.memoize) {
      let memoData = []
      let memoLength = 0
      memoStream = through((c, en, cb) => {
        memoData && memoData.push(c)
        memoLength += c.length
        cb(null, c, en)
      }, cb => {
        memoData && memo.put(cache, entry, Buffer.concat(memoData, memoLength), opts)
        cb()
      })
    } else {
      memoStream = through()
    }
    stream.emit('metadata', entry.metadata)
    stream.emit('integrity', entry.integrity)
    stream.emit('size', entry.size)
    stream.on('newListener', function (ev, cb) {
      ev === 'metadata' && cb(entry.metadata)
      ev === 'integrity' && cb(entry.integrity)
      ev === 'size' && cb(entry.size)
    })
    pipe(
      read.readStream(cache, entry.integrity, opts.concat({
        size: opts.size == null ? entry.size : opts.size
      })),
      memoStream,
      stream
    )
  }).catch(err => stream.emit('error', err))
  return stream
}

module.exports.stream.byDigest = getStreamDigest
function getStreamDigest (cache, integrity, opts) {
  opts = GetOpts(opts)
  const memoized = memo.get.byDigest(cache, integrity, opts)
  if (memoized && opts.memoize !== false) {
    const stream = through()
    stream.write(memoized, () => stream.end())
    return stream
  } else {
    let stream = read.readStream(cache, integrity, opts)
    if (opts.memoize) {
      let memoData = []
      let memoLength = 0
      const memoStream = through((c, en, cb) => {
        memoData && memoData.push(c)
        memoLength += c.length
        cb(null, c, en)
      }, cb => {
        memoData && memo.put.byDigest(
          cache,
          integrity,
          Buffer.concat(memoData, memoLength),
          opts
        )
        cb()
      })
      stream = pipeline(stream, memoStream)
    }
    return stream
  }
}

module.exports.info = info
function info (cache, key, opts) {
  opts = GetOpts(opts)
  const memoized = memo.get(cache, key, opts)
  if (memoized && opts.memoize !== false) {
    return BB.resolve(memoized.entry)
  } else {
    return index.find(cache, key)
  }
}

module.exports.hasContent = read.hasContent

module.exports.copy = function cp (cache, key, dest, opts) {
  return copy(false, cache, key, dest, opts)
}
module.exports.copy.byDigest = function cpDigest (cache, digest, dest, opts) {
  return copy(true, cache, digest, dest, opts)
}
function copy (byDigest, cache, key, dest, opts) {
  opts = GetOpts(opts)
  if (read.copy) {
    return (
      byDigest ? BB.resolve(null) : index.find(cache, key, opts)
    ).then(entry => {
      if (!entry && !byDigest) {
        throw new index.NotFoundError(cache, key)
      }
      return read.copy(
        cache, byDigest ? key : entry.integrity, dest, opts
      ).then(() => byDigest ? key : {
        metadata: entry.metadata,
        size: entry.size,
        integrity: entry.integrity
      })
    })
  } else {
    return getData(byDigest, cache, key, opts).then(res => {
      return fs.writeFileAsync(dest, byDigest ? res : res.data)
        .then(() => byDigest ? key : {
          metadata: res.metadata,
          size: res.size,
          integrity: res.integrity
        })
    })
  }
}

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