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20% npm install speedup: cache extras by package.json string #70

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20% npm install speedup: cache extras by package.json string #70

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cache extras by package.json string
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@mikesherov
mikesherov committed Jun 20, 2017
commit 3f6121500a4d54007cdd62b0debf3472c0691b2f
30 changes: 23 additions & 7 deletions read-json.js
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ readJson.extraSet = [
]

var typoWarned = {}
var cache = {}

function readJson (file, log_, strict_, cb_) {
var log, strict, cb
Expand Down Expand Up @@ -72,14 +73,27 @@ function parseJson (file, er, d, log, strict, cb) {
}
if (er) return cb(er)

if (cache[d]) return cb(null, cache[d])

var data

try {
d = safeJSON.parse(stripBOM(d))
data = safeJSON.parse(stripBOM(d))
} catch (er) {
d = parseIndex(d)
if (!d) return cb(parseError(er, file))
data = parseIndex(d)
if (!data) return cb(parseError(er, file))
}

extras(file, d, log, strict, cb)
extrasCached(file, d, data, log, strict, cb)
}

function extrasCached (file, d, data, log, strict, cb) {
extras(file, data, log, strict, (err, data) => {
if (!err) {
cache[d] = data
}
cb(err, data)
})
}

function indexjs (file, er, log, strict, cb) {
Expand All @@ -89,10 +103,12 @@ function indexjs (file, er, log, strict, cb) {
fs.readFile(index, 'utf8', function (er2, d) {
if (er2) return cb(er)

d = parseIndex(d)
if (!d) return cb(er)
if (cache[d]) return cb(null, cache[d])

var data = parseIndex(d)
if (!data) return cb(er)

extras(file, d, log, strict, cb)
extrasCached(file, d, data, log, strict, cb)
})
}

Expand Down