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'use strict'
const Collect = require('minipass-collect')
const Minipass = require('minipass')
const Pipeline = require('minipass-pipeline')
const index = require('./entry-index')
const memo = require('./memoization')
const read = require('./content/read')
async function getData (cache, key, opts = {}) {
const { integrity, memoize, size } = opts
const memoized = memo.get(cache, key, opts)
if (memoized && memoize !== false) {
return {
metadata: memoized.entry.metadata,
data: memoized.data,
integrity: memoized.entry.integrity,
size: memoized.entry.size,
}
}
const entry = await index.find(cache, key, opts)
if (!entry) {
throw new index.NotFoundError(cache, key)
}
const data = await read(cache, entry.integrity, { integrity, size })
if (memoize) {
memo.put(cache, entry, data, opts)
}
return {
data,
metadata: entry.metadata,
size: entry.size,
integrity: entry.integrity,
}
}
module.exports = getData
async function getDataByDigest (cache, key, opts = {}) {
const { integrity, memoize, size } = opts
const memoized = memo.get.byDigest(cache, key, opts)
if (memoized && memoize !== false) {
return memoized
}
const res = await read(cache, key, { integrity, size })
if (memoize) {
memo.put.byDigest(cache, key, res, opts)
}
return res
}
module.exports.byDigest = getDataByDigest
const getMemoizedStream = (memoized) => {
const stream = new Minipass()
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.end(memoized.data)
return stream
}
function getStream (cache, key, opts = {}) {
const { memoize, size } = opts
const memoized = memo.get(cache, key, opts)
if (memoized && memoize !== false) {
return getMemoizedStream(memoized)
}
const stream = new Pipeline()
// Set all this up to run on the stream and then just return the stream
Promise.resolve().then(async () => {
const entry = await index.find(cache, key)
if (!entry) {
throw new index.NotFoundError(cache, key)
}
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)
})
const src = read.readStream(
cache,
entry.integrity,
{ ...opts, size: typeof size !== 'number' ? entry.size : size }
)
if (memoize) {
const memoStream = new Collect.PassThrough()
memoStream.on('collect', data => memo.put(cache, entry, data, opts))
stream.unshift(memoStream)
}
stream.unshift(src)
return stream
}).catch((err) => stream.emit('error', err))
return stream
}
module.exports.stream = getStream
function getStreamDigest (cache, integrity, opts = {}) {
const { memoize } = opts
const memoized = memo.get.byDigest(cache, integrity, opts)
if (memoized && memoize !== false) {
const stream = new Minipass()
stream.end(memoized)
return stream
} else {
const stream = read.readStream(cache, integrity, opts)
if (!memoize) {
return stream
}
const memoStream = new Collect.PassThrough()
memoStream.on('collect', data => memo.put.byDigest(
cache,
integrity,
data,
opts
))
return new Pipeline(stream, memoStream)
}
}
module.exports.stream.byDigest = getStreamDigest
function info (cache, key, opts = {}) {
const { memoize } = opts
const memoized = memo.get(cache, key, opts)
if (memoized && memoize !== false) {
return Promise.resolve(memoized.entry)
} else {
return index.find(cache, key)
}
}
module.exports.info = info
async function copy (cache, key, dest, opts = {}) {
const entry = await index.find(cache, key, opts)
if (!entry) {
throw new index.NotFoundError(cache, key)
}
await read.copy(cache, entry.integrity, dest, opts)
return {
metadata: entry.metadata,
size: entry.size,
integrity: entry.integrity,
}
}
module.exports.copy = copy
async function copyByDigest (cache, key, dest, opts = {}) {
await read.copy(cache, key, dest, opts)
return key
}
module.exports.copy.byDigest = copyByDigest
module.exports.hasContent = read.hasContent
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