/
avro_serializer.js
58 lines (50 loc) · 1.54 KB
/
avro_serializer.js
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var Schema = require('node-avro-io').Schema,
IO = require('node-avro-io').IO;
var Serializer = function(schema) {
if ((this instanceof arguments.callee) === false) {
return new arguments.callee(schema);
}
this._schema = new Schema.Schema(schema);
return this;
};
Serializer.prototype.serialize = function(datum) {
var buffer = new Buffer([]);
var encoder = new IO.BinaryEncoder({
write: function(data) {
if (!Buffer.isBuffer(data)) {
data = new Buffer([data]);
}
buffer = Buffer.concat([buffer, data]);
}
});
var writer = new IO.DatumWriter(this._schema);
writer.write(datum, encoder);
return buffer;
};
Serializer.prototype.deserialize = function(buffer) {
if (!Buffer.isBuffer(buffer)) {
throw "Buffer object expected";
}
var decoder = new IO.BinaryDecoder({
_i: 0,
read: function(len) {
if (this._i + len > buffer.length) {
throw "reading after buffer exhausted"
}
var i = this._i;
this._i += len;
return len == 1
? buffer[i]
: buffer.slice(i, this._i);
},
skip: function(len) {
if (this._i + len > buffer.length) {
throw "reading after buffer exhausted"
}
this._i += len;
}
});
var reader = new IO.DatumReader(this._schema, this._schema);
return reader.read(decoder);
};
module.exports = exports = Serializer;