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Eliminate unnecessary file read

This commit is contained in:
MICHAEL JACKSON 2017-08-10 22:21:13 -07:00
parent a485858381
commit f54b56b090
1 changed files with 28 additions and 40 deletions
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68
server/middleware/findFile.js
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@ -64,53 +64,41 @@ function findFile(req, res, next) {
} else { } else {
// No filename in the URL. Try to figure out which file they want by // No filename in the URL. Try to figure out which file they want by
// checking package.json's "unpkg", "browser", and "main" fields. // checking package.json's "unpkg", "browser", and "main" fields.
fs.readFile(path.join(req.packageDir, 'package.json'), 'utf8', function (error, data) { let mainFilename
if (error) {
console.error(error)
return res.status(500).send(`Cannot read ${req.packageSpec}/package.json`)
}
let packageConfig const packageConfig = req.packageConfig
try { const queryMain = req.query.main
packageConfig = JSON.parse(data)
} catch (error) {
return res.status(500).send(`Cannot parse ${req.packageSpec}/package.json: ${error.message}`)
}
let mainFilename if (queryMain) {
const queryMain = query && query.main if (!(queryMain in packageConfig))
return res.status(404).send(`Cannot find field "${queryMain}" in ${req.packageSpec}/package.json`)
if (queryMain) { mainFilename = packageConfig[queryMain]
if (!(queryMain in packageConfig)) } else {
return res.status(404).send(`Cannot find field "${queryMain}" in ${req.packageSpec}/package.json`) if (typeof packageConfig.unpkg === 'string') {
// The "unpkg" field allows packages to explicitly declare the
mainFilename = packageConfig[queryMain] // file to serve at the bare URL (see #59).
mainFilename = packageConfig.unpkg
} else if (typeof packageConfig.browser === 'string') {
// Fall back to the "browser" field if declared (only support strings).
mainFilename = packageConfig.browser
} else { } else {
if (typeof packageConfig.unpkg === 'string') { // If there is no main, use "index" (same as npm).
// The "unpkg" field allows packages to explicitly declare the mainFilename = packageConfig.main || 'index'
// file to serve at the bare URL (see #59).
mainFilename = packageConfig.unpkg
} else if (typeof packageConfig.browser === 'string') {
// Fall back to the "browser" field if declared (only support strings).
mainFilename = packageConfig.browser
} else {
// If there is no main, use "index" (same as npm).
mainFilename = packageConfig.main || 'index'
}
} }
}
resolveFile(path.join(req.packageDir, mainFilename), true, function (error, file, stats) { resolveFile(path.join(req.packageDir, mainFilename), true, function (error, file, stats) {
if (error) if (error)
console.error(error) console.error(error)
if (file == null) { if (file == null) {
res.status(404).send(`Cannot find main file "${mainFilename}" in package ${req.packageSpec}`) res.status(404).send(`Cannot find main file "${mainFilename}" in package ${req.packageSpec}`)
} else { } else {
req.file = file.replace(req.packageDir, '') req.file = file.replace(req.packageDir, '')
req.stats = stats req.stats = stats
next() next()
} }
})
}) })
} }
} }