aaac7fed
 liuqimichale
add
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'use strict'
const BB = require('bluebird')
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
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 = 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.stream = getStream
function getStream (cache, key, opts) {
opts = 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()
}
opts.size = opts.size == null ? entry.size : opts.size
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),
memoStream,
stream
)
}, err => stream.emit('error', err))
return stream
}
module.exports.stream.byDigest = getStreamDigest
function getStreamDigest (cache, integrity, opts) {
opts = 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 = 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 = 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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