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path = require('path'),
async = require('async'),
Getdents = require('getdents').Getdents,
sleep = util.promisify(setTimeout);
module.exports = function (size,
num_buckets,
delivered,
pending,
make_fname_handler)
{
const ths = this,
bucket_getdents = [],
popen = util.promisify(this._fs.open),
pclose = util.promisify(this._fs.close);
for (let count = 0; count < num_buckets; count += 1)
{
let getdents = new Getdents(size);
getdents.active = false;
bucket_getdents[count] = getdents;
}
let r = async function (bucket,
bucket_fmt,
extra_matcher,
cache,
only_check_expired,
cb)
{
let d = cache ? delivered.get(bucket) : null,
d2 = cache ? new Set() : null,
pending2 = [];
if (cache)
{
delivered.set(bucket, d2);
}
pending.set(bucket, pending2);
let queue = async.queue(make_fname_handler(d,
d2,
pending2,
bucket_fmt,
extra_matcher,
only_check_expired),
ths._message_concurrency);
let called = false;
let done = false;
let count = 0;
let err = null;
function check()
{
if ((ths._error(err) ||
(done && (count === 0))) &&
!ths._chkstop() &&
!called)
{
called = true;
cb();
}
}
function processed()
{
count--;
check();
}
if (ths._chkstop()) { return; }
let getdents = bucket_getdents[bucket];
try
{
getdents.active = true;
let fd = await popen(ths._msg_dir + path.sep + bucket_fmt, 'r');
try
{
getdents.reset(fd);
for await (let unused_ of getdents)
{
if (getdents.type !== Getdents.DT_DIR)
{
count++;
queue.push(getdents.name, processed);
}
}
}
finally
{
while (true) // eslint-disable-line no-constant-condition
{
try
{
await pclose(fd);
break;
}
catch (ex)
{
if (!ths._try_again(ex))
{
throw ex; // eslint-disable-line no-unsafe-finally
}
}
await sleep(ths._retry_interval);
}
done = true;
}
}
catch (ex)
{
err = ex;
}
finally
{
getdents.active = false;
check();
}
};
r.stop = async function (cb)
{
for (let count = 0; count < num_buckets; count += 1)
{
let getdents = bucket_getdents[count];
if (getdents.active)
{
await sleep(ths._retry_interval);
count -= 1;
}
}
cb();
};
return r;
};
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