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node-q.js
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node-q.js
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var fs = require('fs');
var ffi = require('ffi');
var ref = require('ref');
var struct = require('ref-struct');
var q = ref.types.void; // `q` is an "opaque" type, so we don't know its layout
var ptr_q = ref.refType(q);
var ptr_ptr_q = ref.refType(ptr_q);
var ptr_string = ref.refType(ref.types.CString);
var libq = ffi.Library('libq-1.0', {'q_version': [ 'string', [ ] ],
'q_connect': [ 'void', [ ptr_ptr_q, 'string' ] ],
'q_disconnect': [ 'void', [ ptr_q ] ],
'q_post': [ 'void', [ ptr_q, 'string', 'string', 'string', 'long', ptr_string ]],
'q_reschedule': [ 'bool', [ ptr_q, 'string', 'long' ]],
'q_cancel': [ 'bool', [ ptr_q, 'string' ]],
// https://github.com/rbranson/node-ffi/issues/76
'q_worker': [ 'void', [ ptr_q, 'string', 'pointer' ] ],
'q_observer': [ 'void', [ ptr_q, 'string', 'pointer' ] ],
'q_drop': [ 'void', [ ptr_q ] ],
});
var pq = null;
var workers=[];
var observers=[];
exports.version = function()
{
return libq.q_version();
}
exports.connect = function(config)
{
if (pq) return;
if (config) config = JSON.stringify(config);
var ppq = ref.alloc(ptr_ptr_q);
libq.q_connect(ppq, config);
pq = ppq.deref();
}
exports.disconnect = function()
{
if (!pq) return;
libq.q_disconnect(pq);
pq = null;
workers = [];
observers = [];
}
exports.post = function(queue, job)
{
if (!pq) return;
if (!queue) return;
if (!job) return;
if (!job.data) return;
var data = job.data === Object(job.data) ? JSON.stringify(job.data) : job.data;
var run_at = normalize_timestamp(job.run_at);
var puid = ref.alloc(ref.types.CString);
libq.q_post(pq, queue, job.uid, data, run_at, puid);
return puid.deref();
}
exports.reschedule = function(uid, run_at)
{
if (!pq) return;
if (!uid) return;
run_at = normalize_timestamp(run_at);
return libq.q_reschedule(pq, uid, run_at);
}
exports.cancel = function(uid)
{
if (!pq) return;
if (!uid) return;
return libq.q_cancel(pq, uid);
}
exports.worker = function(queue, worker)
{
if (!pq) return;
if (!queue) return;
var q_worker = ffi.Callback('void', [ptr_string], function (pdata)
{
var data = pdata.deref();
worker(data);
});
// https://github.com/rbranson/node-ffi/issues/84
workers.push(q_worker);
libq.q_worker(pq, queue, q_worker);
}
exports.observer = function(queue, observer)
{
if (!pq) return;
if (!queue) return;
var q_observer = ffi.Callback('void', [ptr_string], function (pdata)
{
var data = pdata.deref();
observer(data);
});
// https://github.com/rbranson/node-ffi/issues/84
observers.push(q_observer);
libq.q_observer(pq, queue, q_observer);
}
// careful, dropes all queues!
exports.drop = function()
{
if (!pq) return;
libq.q_drop(pq);
}
function normalize_timestamp(timestamp)
{
if (!timestamp) return 0;
if (is_number(timestamp)) return timestamp/1000;
if (is_date(timestamp)) return timestamp.getTime()/1000;
throw new Exception("invalid timestamp")
}
function is_number(candidate)
{
return is_of_proto(candidate, "[object Number]");
}
function is_date(candidate)
{
return is_of_proto(candidate, "[object Date]");
}
function is_of_proto(candidate, proto)
{
return proto === Object.prototype.toString.call(candidate);
}