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var test = require('tap').test
// simulated ulimit
// this is like graceful-fs, but in reverse
var fs_ = require('fs')
var fs = require('../graceful-fs.js')
var files = fs.readdirSync(__dirname)
// Ok, no more actual file reading!
var fds = 0
var nextFd = 60
var limit = 8
fs_.open = function (path, flags, mode, cb) {
process.nextTick(function() {
++fds
if (fds >= limit) {
--fds
var er = new Error('EMFILE Curses!')
er.code = 'EMFILE'
er.path = path
return cb(er)
} else {
cb(null, nextFd++)
}
})
}
fs_.openSync = function (path, flags, mode) {
if (fds >= limit) {
var er = new Error('EMFILE Curses!')
er.code = 'EMFILE'
er.path = path
throw er
} else {
++fds
return nextFd++
}
}
fs_.close = function (fd, cb) {
process.nextTick(function () {
--fds
cb()
})
}
fs_.closeSync = function (fd) {
--fds
}
fs_.readdir = function (path, cb) {
process.nextTick(function() {
if (fds >= limit) {
var er = new Error('EMFILE Curses!')
er.code = 'EMFILE'
er.path = path
return cb(er)
} else {
++fds
process.nextTick(function () {
--fds
cb(null, [__filename, "some-other-file.js"])
})
}
})
}
fs_.readdirSync = function (path) {
if (fds >= limit) {
var er = new Error('EMFILE Curses!')
er.code = 'EMFILE'
er.path = path
throw er
} else {
return [__filename, "some-other-file.js"]
}
}
test('open emfile autoreduce', function (t) {
fs.MIN_MAX_OPEN = 4
t.equal(fs.MAX_OPEN, 1024)
var max = 12
for (var i = 0; i < max; i++) {
fs.open(__filename, 'r', next(i))
}
var phase = 0
var expect =
[ [ 0, 60, null, 1024, 4, 12, 1 ],
[ 1, 61, null, 1024, 4, 12, 2 ],
[ 2, 62, null, 1024, 4, 12, 3 ],
[ 3, 63, null, 1024, 4, 12, 4 ],
[ 4, 64, null, 1024, 4, 12, 5 ],
[ 5, 65, null, 1024, 4, 12, 6 ],
[ 6, 66, null, 1024, 4, 12, 7 ],
[ 7, 67, null, 6, 4, 5, 1 ],
[ 8, 68, null, 6, 4, 5, 2 ],
[ 9, 69, null, 6, 4, 5, 3 ],
[ 10, 70, null, 6, 4, 5, 4 ],
[ 11, 71, null, 6, 4, 5, 5 ] ]
var actual = []
function next (i) { return function (er, fd) {
if (er)
throw er
actual.push([i, fd, er, fs.MAX_OPEN, fs.MIN_MAX_OPEN, fs._curOpen, fds])
if (i === max - 1) {
t.same(actual, expect)
t.ok(fs.MAX_OPEN < limit)
t.end()
}
fs.close(fd)
} }
})
test('readdir emfile autoreduce', function (t) {
fs.MAX_OPEN = 1024
var max = 12
for (var i = 0; i < max; i ++) {
fs.readdir(__dirname, next(i))
}
var expect =
[ [0,[__filename,"some-other-file.js"],null,7,4,7,7],
[1,[__filename,"some-other-file.js"],null,7,4,7,6],
[2,[__filename,"some-other-file.js"],null,7,4,7,5],
[3,[__filename,"some-other-file.js"],null,7,4,7,4],
[4,[__filename,"some-other-file.js"],null,7,4,7,3],
[5,[__filename,"some-other-file.js"],null,7,4,6,2],
[6,[__filename,"some-other-file.js"],null,7,4,5,1],
[7,[__filename,"some-other-file.js"],null,7,4,4,0],
[8,[__filename,"some-other-file.js"],null,7,4,3,3],
[9,[__filename,"some-other-file.js"],null,7,4,2,2],
[10,[__filename,"some-other-file.js"],null,7,4,1,1],
[11,[__filename,"some-other-file.js"],null,7,4,0,0] ]
var actual = []
function next (i) { return function (er, files) {
if (er)
throw er
var line = [i, files, er, fs.MAX_OPEN, fs.MIN_MAX_OPEN, fs._curOpen, fds ]
actual.push(line)
if (i === max - 1) {
t.ok(fs.MAX_OPEN < limit)
t.same(actual, expect)
t.end()
}
} }
})