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var crypto = require("crypto")
var path = require("path")
var npm = require("../npm.js")
var lockFile = require("lockfile")
var log = require("npmlog")
var getCacheStat = require("../cache/get-stat.js")
function lockFileName (u) {
var c = u.replace(/[^a-zA-Z0-9]+/g, "-").replace(/^-+|-+$/g, "")
, h = crypto.createHash("sha1").update(u).digest("hex")
h = h.substr(0, 8)
c = c.substr(-32)
log.silly("lockFile", h + "-" + c, u)
return path.resolve(npm.config.get("cache"), h + "-" + c + ".lock")
}
var myLocks = {}
function lock (u, cb) {
// the cache dir needs to exist already for this.
getCacheStat(function (er, cs) {
if (er) return cb(er)
var opts = { stale: npm.config.get("cache-lock-stale")
, retries: npm.config.get("cache-lock-retries")
, wait: npm.config.get("cache-lock-wait") }
var lf = lockFileName(u)
log.verbose("lock", u, lf)
lockFile.lock(lf, opts, function(er) {
if (!er) myLocks[lf] = true
cb(er)
})
})
}
function unlock (u, cb) {
var lf = lockFileName(u)
, locked = myLocks[lf]
if (locked === false) {
return process.nextTick(cb)
} else if (locked === true) {
myLocks[lf] = false
lockFile.unlock(lockFileName(u), cb)
} else {
throw new Error("Attempt to unlock " + u + ", which hasn't been locked")
}
}
module.exports = {
lock: lock,
unlock: unlock,
_lockFileName: lockFileName
}
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