* first action! (#1)

node_modules/cacache/get.js

@@ -0,0 +1,247 @@
+'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
+        })
+    })
+  }
+}