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/**
* In-memory transport. This allows messages to be sent over an in-memory stream
* to a server running in the same process. The in-memory stream has minimal
* overhead (the messages aren't copied).
*
* An extra {@link centro-js/lib/server.CentroServer#transport_ops|transport operation} for this transport is added to the {@link centro-js/lib/server.CentroServer|server object}:
*
* <div class="prose transport_ops mb2 h5">
* <style>.transport_ops table { width: 100%}</style>
*
* | Name | Type |
* | :------ | :------------------------------------------------------------------------------ |
* | connect | {@link centro-js/lib/server_transports/in-mem.connectCallback connectCallback} |
*
* </div>
*
* @module centro-js/lib/server_transports/in-mem
* @param {Object} config - Configuration options. This supports all the options supported by stream.Duplex as well as the following:
* @param {Object} [config.in-mem] - If present then this is used in preference to `config`.
*/
"use strict";
var util = require('util'),
Duplex = require('stream').Duplex;
function RightDuplex(left, options)
{
Duplex.call(this, options);
options = options || {};
this.left = left;
this._orig_emit = this.emit;
this.emit = function (type)
{
if (type === 'error')
{
var args = Array.prototype.slice.call(arguments);
process.nextTick(function ()
{
left._orig_emit.apply(left, args);
});
}
return this._orig_emit.apply(this, arguments);
};
this._orig_destroy = this.destroy;
this.destroy = function (err, now)
{
const destroy = () => {
left.destroy();
this._orig_destroy(err);
};
if ((options.destroy_wait === undefined) || now)
{
return destroy();
}
setTimeout(destroy, options.destroy_wait);
};
this._no_keep_alive = true;
}
util.inherits(RightDuplex, Duplex);
RightDuplex.prototype._final = function (cb)
{
this.left.push(null);
cb();
};
RightDuplex.prototype._read = function ()
{
if (this._cb)
{
var cb = this._cb;
this._cb = null;
process.nextTick(cb);
}
};
RightDuplex.prototype._write = function (chunk, encoding, cb)
{
if (this.left.push(chunk, encoding))
{
process.nextTick(cb);
}
else
{
this.left._cb = cb;
}
};
function LeftDuplex(options)
{
Duplex.call(this, options);
this.right = new RightDuplex(this, options);
this._orig_emit = this.emit;
this.emit = function (type)
{
if (type === 'error')
{
var ths = this,
args = Array.prototype.slice.call(arguments);
process.nextTick(function ()
{
ths.right._orig_emit.apply(ths.right, args);
});
}
else if (type === 'close')
{
this.right.destroy(undefined, true);
}
return this._orig_emit.apply(this, arguments);
};
this._no_keep_alive = true;
}
util.inherits(LeftDuplex, Duplex);
LeftDuplex.prototype._final = function (cb)
{
this.right.push(null);
cb();
};
LeftDuplex.prototype._read = function ()
{
if (this._cb)
{
var cb = this._cb;
this._cb = null;
process.nextTick(cb);
}
};
LeftDuplex.prototype._write = function (chunk, encoding, cb)
{
if (this.right.push(chunk, encoding))
{
process.nextTick(cb);
}
else
{
this.right._cb = cb;
}
};
module.exports = function (config, authorize, connected, ready, unused_error, warning)
{
config = config['in-mem'] || config;
ready(null,
{
close: function (cb)
{
cb();
},
connect: function (cb)
{
var left = new LeftDuplex(Object.assign(
{
allowHalfOpen: false,
autoDestroy: true,
destroy_wait: 1000
}, config));
left.right.on('end', function ()
{
try
{
this.destroy();
}
catch (ex)
{
/* istanbul ignore next */
warning(ex);
}
});
function destroy(mqserver, now)
{
left.right.destroy(undefined, now);
}
function onclose(cb)
{
if (left.right.destroyed)
{
return cb();
}
left.right.on('close', cb);
}
authorize(left.right, now => destroy(null, now), onclose, function (err, handshakes)
{
if (err)
{
return left.right.destroy();
}
connected(handshakes, left.right, destroy, onclose);
});
cb(null, left);
}
});
};
module.exports.LeftDuplex = LeftDuplex;
/*eslint-disable no-unused-vars */
/** Callback type for connecting to in-memory transport.
*
* @callback connectCallback
* @memberof centro-js/lib/server_transports/in-mem
* @param {?Error} err - Error, if one occurred.
* @param {stream.Duplex} stream - Stream on which to talk to the server. Use this with {@link centro-js/lib/client.stream_auth|stream_auth}.
*/
/* istanbul ignore next */
exports._connectCallback = function (err, stream) {};
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