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dataflow_udf_transform.js
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dataflow_udf_transform.js
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [START dataflow_extensible_template_udf]
/**
* User-defined function (UDF) to transform events
* as part of a Dataflow template job.
*
* @param {string} inJson input Pub/Sub JSON message (stringified)
*/
function process(inJson) {
const obj = JSON.parse(inJson);
const includePubsubMessage = obj.data && obj.attributes;
const data = includePubsubMessage ? obj.data : obj;
if (!data.hasOwnProperty('url')) {
throw new Error("No url found");
} else if (data.url !== "https://beam.apache.org/") {
throw new Error("Unrecognized url");
}
return JSON.stringify(obj);
}
// [END dataflow_extensible_template_udf]