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shrine-medco/apps/steward-app/node/node_modules/npm/lib/cache/caching-client.js
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caching-client.js
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module.exports = CachingRegistryClient
var path = require('path')
var fs = require('graceful-fs')
var url = require('url')
var assert = require('assert')
var inherits = require('util').inherits
var RegistryClient = require('npm-registry-client')
var npm = require('../npm.js')
var log = require('npmlog')
var getCacheStat = require('./get-stat.js')
var cacheFile = require('npm-cache-filename')
var mkdirp = require('mkdirp')
var rimraf = require('rimraf')
var chownr = require('chownr')
var writeFile = require('write-file-atomic')
var parseJSON = require('../utils/parse-json')
function CachingRegistryClient (config) {
RegistryClient.call(this, adaptConfig(config))
this._mapToCache = cacheFile(config.get('cache'))
// swizzle in our custom cache invalidation logic
this._request = this.request
this.request = this._invalidatingRequest
this.get = get
}
inherits(CachingRegistryClient, RegistryClient)
CachingRegistryClient.prototype._invalidatingRequest = function (uri, params, cb) {
var client = this
this._request(uri, params, function () {
var args = arguments
var method = params.method
if (method !== 'HEAD' && method !== 'GET') {
var invalidated = client._mapToCache(uri)
// invalidate cache
//
// This is irrelevant for commands that do etag / last-modified caching,
// but ls and view also have a timed cache, so this keeps the user from
// thinking that it didn't work when it did.
// Note that failure is an acceptable option here, since the only
// result will be a stale cache for some helper commands.
log.verbose('request', 'invalidating', invalidated, 'on', method)
return rimraf(invalidated, function () {
cb.apply(undefined, args)
})
}
cb.apply(undefined, args)
})
}
function get (uri, params, cb) {
assert(typeof uri === 'string', 'must pass registry URI to get')
assert(params && typeof params === 'object', 'must pass params to get')
assert(typeof cb === 'function', 'must pass callback to get')
var parsed = url.parse(uri)
assert(
parsed.protocol === 'http:' || parsed.protocol === 'https:',
'must have a URL that starts with http: or https:'
)
var cacheBase = cacheFile(npm.config.get('cache'))(uri)
var cachePath = path.join(cacheBase, '.cache.json')
// If the GET is part of a write operation (PUT or DELETE), then
// skip past the cache entirely, but still save the results.
if (uri.match(/\?write=true$/)) {
log.verbose('get', 'GET as part of write; not caching result')
return get_.call(this, uri, cachePath, params, cb)
}
if (params.skipCache) {
return get_.call(this, uri, cachePath, params, cb)
}
var client = this
fs.stat(cachePath, function (er, stat) {
if (!er) {
fs.readFile(cachePath, function (er, data) {
data = parseJSON.noExceptions(data)
params.stat = stat
params.data = data
get_.call(client, uri, cachePath, params, cb)
})
} else {
get_.call(client, uri, cachePath, params, cb)
}
})
}
function get_ (uri, cachePath, params, cb) {
var staleOk = params.staleOk === undefined ? false : params.staleOk
var timeout = params.timeout === undefined ? -1 : params.timeout
var data = params.data
var stat = params.stat
var etag
var lastModified
timeout = Math.min(timeout, npm.config.get('cache-max') || 0)
timeout = Math.max(timeout, npm.config.get('cache-min') || -Infinity)
if (process.env.COMP_CWORD !== undefined &&
process.env.COMP_LINE !== undefined &&
process.env.COMP_POINT !== undefined) {
timeout = Math.max(timeout, 60000)
}
if (data) {
if (data._etag) etag = data._etag
if (data._lastModified) lastModified = data._lastModified
data._cached = true
if (stat && timeout && timeout > 0) {
if ((Date.now() - stat.mtime.getTime()) / 1000 < timeout) {
log.verbose('get', uri, 'not expired, no request')
delete data._etag
delete data._lastModified
return cb(null, data, JSON.stringify(data), { statusCode: 304 })
}
if (staleOk) {
log.verbose('get', uri, 'staleOk, background update')
delete data._etag
delete data._lastModified
process.nextTick(
cb.bind(null, null, data, JSON.stringify(data), { statusCode: 304 })
)
cb = function () {}
}
}
}
var options = {
etag: etag,
lastModified: lastModified,
follow: params.follow,
auth: params.auth
}
this.request(uri, options, function (er, remoteData, raw, response) {
// if we get an error talking to the registry, but we have it
// from the cache, then just pretend we got it.
if (er && cachePath && data && !data.error) {
er = null
response = { statusCode: 304 }
}
if (response) {
log.silly('get', 'cb', [response.statusCode, response.headers])
if (response.statusCode === 304 && (etag || lastModified)) {
remoteData = data
log.verbose(etag ? 'etag' : 'lastModified', uri + ' from cache')
}
}
data = remoteData
if (!data) er = er || new Error('failed to fetch from registry: ' + uri)
if (er) return cb(er, data, raw, response)
saveToCache(cachePath, data, saved)
// just give the write the old college try. if it fails, whatever.
function saved () {
delete data._etag
delete data._lastModified
cb(er, data, raw, response)
}
function saveToCache (cachePath, data, saved) {
log.verbose('get', 'saving', data.name, 'to', cachePath)
getCacheStat(function (er, st) {
mkdirp(path.dirname(cachePath), function (er, made) {
if (er) return saved()
writeFile(cachePath, JSON.stringify(data), function (er) {
if (er) return saved()
chownr(made || cachePath, st.uid, st.gid, saved)
})
})
})
}
})
}
function adaptConfig (config) {
return {
proxy: {
http: config.get('proxy'),
https: config.get('https-proxy'),
localAddress: config.get('local-address')
},
ssl: {
certificate: config.get('cert'),
key: config.get('key'),
ca: config.get('ca'),
strict: config.get('strict-ssl')
},
retry: {
retries: config.get('fetch-retries'),
factor: config.get('fetch-retry-factor'),
minTimeout: config.get('fetch-retry-mintimeout'),
maxTimeout: config.get('fetch-retry-maxtimeout')
},
userAgent: config.get('user-agent'),
log: log,
defaultTag: config.get('tag'),
couchToken: config.get('_token'),
maxSockets: config.get('maxsockets')
}
}
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