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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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