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module.exports = get
var GET = require("./request.js").GET
, fs = require("graceful-fs")
, npm = require("../../npm.js")
, path = require("path")
, log = require("../log.js")
, mkdir = require("../mkdir-p.js")
, cacheStat = null
function get (project, version, timeout, nofollow, staleOk, cb) {
if (typeof cb !== "function") cb = staleOk, staleOk = false
if (typeof cb !== "function") cb = nofollow, nofollow = false
if (typeof cb !== "function") cb = timeout, timeout = -1
if (typeof cb !== "function") cb = version, version = null
if (typeof cb !== "function") cb = project, project = null
if (typeof cb !== "function") {
throw new Error("No callback provided to registry.get")
}
if ( process.env.COMP_CWORD !== undefined
&& process.env.COMP_LINE !== undefined
&& process.env.COMP_POINT !== undefined
) timeout = Math.max(timeout, 60000)
var uri = []
uri.push(project || "")
if (version) uri.push(version)
uri = uri.join("/")
// /-/all is special.
// It uses timestamp-based caching and partial updates,
// because it is a monster.
if (uri === "/-/all") {
return requestAll(cb)
}
var cache = path.join(npm.cache, uri, ".cache.json")
fs.stat(cache, function (er, stat) {
if (!er) fs.readFile(cache, function (er, data) {
try { data = JSON.parse(data) }
catch (ex) { data = null }
get_(uri, timeout, cache, stat, data, nofollow, staleOk, cb)
})
else get_(uri, timeout, cache, null, null, nofollow, staleOk, cb)
})
}
function requestAll (cb) {
var cache = path.join(npm.cache, "/-/all", ".cache.json")
mkdir(path.join(npm.cache, "-", "all"), function (er) {
fs.readFile(cache, function (er, data) {
if (er) return requestAll_(0, {}, cb)
try {
data = JSON.parse(data)
} catch (ex) {
fs.writeFile(cache, "{}", function (er) {
if (er) return cb(new Error("Broken cache. "
+"Please run 'npm cache clean' "
+"and try again."))
return requestAll_(0, {}, cb)
})
}
var t = +data._updated || 0
requestAll_(t, data, cb)
})
})
}
function requestAll_ (c, data, 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 () {}
}
var uri = "/-/all/since?stale=update_after&startkey=" + c
if (c === 0) {
log.warn("Building the local index for the first time, please be patient")
uri = "/-/all"
}
var cache = path.join(npm.cache, "-/all", ".cache.json")
GET(uri, function (er, updates, _, res) {
if (er) return cb(er, data)
var headers = res.headers
, 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, timeout, cache, stat, data, nofollow, staleOk, cb) {
var etag
if (data && data._etag) etag = data._etag
if (timeout && timeout > 0 && stat && data) {
if ((Date.now() - stat.mtime.getTime())/1000 < timeout) {
log.verbose("not expired, no request", "registry.get " +uri)
delete data._etag
return cb(null, data, JSON.stringify(data), {statusCode:304})
}
if (staleOk) {
log.verbose("staleOk, background update", "registry.get " +uri)
delete data._etag
process.nextTick(cb.bind( null, null, data, JSON.stringify(data)
, {statusCode: 304} ))
cb = function () {}
}
}
GET(uri, etag, nofollow, 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) {
log.silly([response.statusCode, response.headers], "get cb")
if (response.statusCode === 304 && etag) {
remoteData = data
log.verbose(uri+" from cache", "etag")
}
}
data = remoteData
if (!data) {
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(cache, data, saved)
})
}
function saveToCache (cache, data, saved) {
if (cacheStat) {
return saveToCache_(cache, data, cacheStat.uid, cacheStat.gid, saved)
}
fs.stat(npm.cache, function (er, st) {
if (er) {
return fs.stat(process.env.HOME || "", function (er, st) {
// if this fails, oh well.
if (er) return saved()
cacheStat = st
return saveToCache(cache, data, saved)
})
}
cacheStat = st || { uid: null, gid: null }
return saveToCache(cache, data, saved)
})
}
function saveToCache_ (cache, data, uid, gid, saved) {
mkdir(path.dirname(cache), npm.modes.exec, uid, gid, function (er) {
if (er) return saved()
fs.writeFile(cache, JSON.stringify(data), function (er) {
if (er || uid === null || gid === null) {
return saved()
}
fs.chown(cache, uid, gid, saved)
})
})
}
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