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module.exports = get
var fs = require("graceful-fs")
, assert = require("assert")
, path = require("path")
, mkdir = require("mkdirp")
, chownr = require("chownr")
, url = require("url")
/**
* options:
*
* timeout: request timeouts
* follow: follow redirects
* staleOk: stale results are OK
* stat: results of checking for cached metadata
* data: the cached metadata
*/
function get (uri, options, cb) {
assert(uri, "must have URL to fetch")
assert(cb, "must have callback")
if (!options) options = {}
var parsed = url.parse(uri)
assert(parsed.protocol, "must have a URL that starts with npm:, http:, or https:")
var cache = this.cacheFile(uri) + "/.cache.json"
// /-/all is special.
// It uses timestamp-based caching and partial updates,
// because it is a monster.
if (parsed.pathname === "/-/all") {
return requestAll.call(this, uri, cache, cb)
}
// 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$/)) {
return get_.call(this, uri, cache, options, cb)
}
fs.stat(cache, function (er, stat) {
if (!er) fs.readFile(cache, function (er, data) {
try { data = JSON.parse(data) }
catch (ex) { data = null }
options.stat = stat
options.data = data
get_.call(this, uri, cache, options, cb)
}.bind(this))
else {
get_.call(this, uri, cache, options, cb)
}
}.bind(this))
}
function requestAll (uri, cache, cb) {
this.log.info("get", cache)
mkdir(path.dirname(cache), function (er) {
if (er) return cb(er)
fs.readFile(cache, function (er, data) {
if (er) return requestAll_.call(this, uri, 0, {}, cache, cb)
try {
data = JSON.parse(data)
} catch (ex) {
fs.writeFile(cache, "{}", function (er) {
if (er) return cb(new Error("Broken cache."))
return requestAll_.call(this, uri, 0, {}, cache, cb)
}.bind(this))
}
var t = +data._updated || 0
requestAll_.call(this, uri, t, data, cache, cb)
}.bind(this))
}.bind(this))
}
function requestAll_ (uri, c, data, cache, cb) {
// use the cache and update in the background if it's not too old
if (Date.now() - c < 60000) {
cb(null, data)
cb = function () {}
}
if (c === 0) {
this.log.warn("", "Building the local index for the first time, please be patient")
uri = url.resolve(uri, "/-/all")
}
else {
uri = url.resolve(uri, "/-/all/since?stale=update_after&startkey=" + c)
}
this.request('GET', uri, null, function (er, updates, _, res) {
if (er) return cb(er, data)
var headers = res.headers
, updated = updates._updated || Date.parse(headers.date)
Object.keys(updates).forEach(function (p) {
data[p] = updates[p]
})
data._updated = updated
fs.writeFile( cache, JSON.stringify(data)
, function (er) {
delete data._updated
return cb(er, data)
})
})
}
function get_ (uri, cache, options, cb) {
var staleOk = options.staleOk === undefined ? false : options.staleOk
, follow = options.follow
, data = options.data
, stat = options.stat
, etag
var timeout = options.timeout === undefined ? -1 : options.timeout
timeout = Math.min(timeout, this.conf.get('cache-max') || 0)
timeout = Math.max(timeout, this.conf.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 && data._etag) etag = data._etag
if (timeout && timeout > 0 && options.stat && options.data) {
if ((Date.now() - stat.mtime.getTime())/1000 < timeout) {
this.log.verbose("registry.get", uri, "not expired, no request")
delete data._etag
return cb(null, data, JSON.stringify(data), {statusCode:304})
}
if (staleOk) {
this.log.verbose("registry.get", uri, "staleOk, background update")
delete data._etag
process.nextTick(cb.bind( null, null, data, JSON.stringify(data)
, {statusCode: 304} ))
cb = function () {}
}
}
this.request('GET', uri, { etag : etag, follow : follow }, 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 && cache && data && !data.error) {
er = null
response = {statusCode: 304}
}
if (response) {
this.log.silly("registry.get", "cb", [response.statusCode, response.headers])
if (response.statusCode === 304 && etag) {
remoteData = data
this.log.verbose("etag", 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)
// just give the write the old college try. if it fails, whatever.
function saved () {
delete data._etag
cb(er, data, raw, response)
}
saveToCache.call(this, cache, data, saved)
}.bind(this))
}
function saveToCache (cache, data, saved) {
if (this._cacheStat) {
var cs = this._cacheStat
return saveToCache_.call(this, cache, data, cs.uid, cs.gid, saved)
}
fs.stat(this.conf.get('cache'), function (er, st) {
if (er) {
return fs.stat(process.env.HOME || "", function (er, st) {
// if this fails, oh well.
if (er) return saved()
this._cacheStat = st
return saveToCache.call(this, cache, data, saved)
}.bind(this))
}
this._cacheStat = st || { uid: null, gid: null }
return saveToCache.call(this, cache, data, saved)
}.bind(this))
}
function saveToCache_ (cache, data, uid, gid, saved) {
mkdir(path.dirname(cache), function (er, made) {
if (er) return saved()
fs.writeFile(cache, JSON.stringify(data), function (er) {
if (er || uid === null || gid === null) {
return saved()
}
chownr(made || cache, uid, gid, saved)
})
})
}
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