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shrine-medco/apps/steward-app/node/node_modules/npm/lib/cache/add-remote-tarball.js
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add-remote-tarball.js
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var mkdir = require('mkdirp')
var assert = require('assert')
var log = require('npmlog')
var path = require('path')
var sha = require('sha')
var retry = require('retry')
var writeStreamAtomic = require('fs-write-stream-atomic')
var PassThrough = require('readable-stream').PassThrough
var npm = require('../npm.js')
var inflight = require('inflight')
var addLocalTarball = require('./add-local-tarball.js')
var cacheFile = require('npm-cache-filename')
var rimraf = require('rimraf')
var pulseTillDone = require('../utils/pulse-till-done.js')
module.exports = addRemoteTarball
function addRemoteTarball (u, pkgData, shasum, auth, cb_) {
assert(typeof u === 'string', 'must have module URL')
assert(typeof cb_ === 'function', 'must have callback')
function cb (er, data) {
if (data) {
data._from = u
data._resolved = u
data._shasum = data._shasum || shasum
}
cb_(er, data)
}
cb_ = inflight(u, cb_)
if (!cb_) return log.verbose('addRemoteTarball', u, 'already in flight; waiting')
log.verbose('addRemoteTarball', u, 'not in flight; adding')
// XXX Fetch direct to cache location, store tarballs under
// ${cache}/registry.npmjs.org/pkg/-/pkg-1.2.3.tgz
var tmp = cacheFile(npm.tmp, u)
function next (er, resp, shasum) {
if (er) return cb(er)
addLocalTarball(tmp, pkgData, shasum, cleanup)
}
function cleanup (er, data) {
if (er) return cb(er)
rimraf(tmp, function () {
cb(er, data)
})
}
log.verbose('addRemoteTarball', [u, shasum])
mkdir(path.dirname(tmp), function (er) {
if (er) return cb(er)
addRemoteTarball_(u, tmp, shasum, auth, next)
})
}
function addRemoteTarball_ (u, tmp, shasum, auth, cb) {
// Tuned to spread 3 attempts over about a minute.
// See formula at <https://github.com/tim-kos/node-retry>.
var operation = retry.operation({
retries: npm.config.get('fetch-retries'),
factor: npm.config.get('fetch-retry-factor'),
minTimeout: npm.config.get('fetch-retry-mintimeout'),
maxTimeout: npm.config.get('fetch-retry-maxtimeout')
})
operation.attempt(function (currentAttempt) {
log.info(
'retry',
'fetch attempt', currentAttempt,
'at', (new Date()).toLocaleTimeString()
)
fetchAndShaCheck(u, tmp, shasum, auth, function (er, response, shasum) {
// Only retry on 408, 5xx or no `response`.
var sc = response && response.statusCode
var statusRetry = !sc || (sc === 408 || sc >= 500)
if (er && statusRetry && operation.retry(er)) {
log.warn('retry', 'will retry, error on last attempt: ' + er)
return
}
cb(er, response, shasum)
})
})
}
function fetchAndShaCheck (u, tmp, shasum, auth, cb) {
cb = pulseTillDone('fetchTarball', cb)
npm.registry.fetch(u, { auth: auth }, function (er, response) {
if (er) {
log.error('fetch failed', u)
return cb(er, response)
}
var tarball = writeStreamAtomic(tmp, { mode: npm.modes.file })
tarball.on('error', function (er) {
cb(er)
tarball.destroy()
})
tarball.on('finish', function () {
if (!shasum) {
// Well, we weren't given a shasum, so at least sha what we have
// in case we want to compare it to something else later
return sha.get(tmp, function (er, shasum) {
log.silly('fetchAndShaCheck', 'shasum', shasum)
cb(er, response, shasum)
})
}
// validate that the url we just downloaded matches the expected shasum.
log.silly('fetchAndShaCheck', 'shasum', shasum)
sha.check(tmp, shasum, function (er) {
if (er && er.message) {
// add original filename for better debuggability
er.message = er.message + '\n' + 'From: ' + u
}
return cb(er, response, shasum)
})
})
// 0.8 http streams have a bug, where if they're paused with data in
// their buffers when the socket closes, they call `end` before emptying
// those buffers, which results in the entire pipeline ending and thus
// the point that applied backpressure never being able to trigger a
// `resume`.
// We work around this by piping into a pass through stream that has
// unlimited buffering. The pass through stream is from readable-stream
// and is thus a current streams3 implementation that is free of these
// bugs even on 0.8.
response.pipe(PassThrough({highWaterMark: Infinity})).pipe(tarball)
})
}
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