1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
'use strict'
const BB = require('bluebird')
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
|
