解析 JSON 时出现 Google Cloud Dataflow Javascript UDF 错误

Question

我已使用 Pub/Sub to BigQuery template 流式传输发送到 Pub/Sub 主题的 JSON 数据。通过 Dataflow，我想展平数据以匹配 BigQuery 架构并流式传输它们。

这是数据流流程的 Javascript UDF：

function transform(inJson) {
    var obj = JSON.parse(inJson);
    // variable declarations
    // ... 
    data['domain'] = obj['data']['domain']; // line 18
    ...

    return JSON.stringify(data);
}

我也试过了：

data.domain = obj.data.domain;

我刚刚从 here 复制了示例并将其扩展为展平 JSON 数据。

这里是错误信息：

TypeError: Cannot read property "domain" from undefined in <eval> at line number 18

和堆栈跟踪：

javax.script.ScriptException: TypeError: Cannot read property "domain" from undefined in <eval> at line number 18
    at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:470)
    at jdk.nashorn.api.scripting.NashornScriptEngine.invokeImpl(NashornScriptEngine.java:392)
    at jdk.nashorn.api.scripting.NashornScriptEngine.invokeFunction(NashornScriptEngine.java:190)
    at com.google.cloud.teleport.templates.common.JavascriptTextTransformer$JavascriptRuntime.invoke(JavascriptTextTransformer.java:156)
    at com.google.cloud.teleport.templates.common.JavascriptTextTransformer$FailsafeJavascriptUdf$1.processElement(JavascriptTextTransformer.java:315)
    at com.google.cloud.teleport.templates.common.JavascriptTextTransformer$FailsafeJavascriptUdf$1$DoFnInvoker.invokeProcessElement(Unknown Source)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.invokeProcessElement(SimpleDoFnRunner.java:275)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.processElement(SimpleDoFnRunner.java:240)
    at org.apache.beam.runners.dataflow.worker.SimpleParDoFn.processElement(SimpleParDoFn.java:325)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoOperation.process(ParDoOperation.java:44)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.OutputReceiver.process(OutputReceiver.java:49)
    at org.apache.beam.runners.dataflow.worker.SimpleParDoFn$1.output(SimpleParDoFn.java:272)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.outputWindowedValue(SimpleDoFnRunner.java:309)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.access$700(SimpleDoFnRunner.java:77)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:621)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:609)
    at com.google.cloud.teleport.templates.PubSubToBigQuery$PubsubMessageToFailsafeElementFn.processElement(PubSubToBigQuery.java:412)
    at com.google.cloud.teleport.templates.PubSubToBigQuery$PubsubMessageToFailsafeElementFn$DoFnInvoker.invokeProcessElement(Unknown Source)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.invokeProcessElement(SimpleDoFnRunner.java:275)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.processElement(SimpleDoFnRunner.java:240)
    at org.apache.beam.runners.dataflow.worker.SimpleParDoFn.processElement(SimpleParDoFn.java:325)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoOperation.process(ParDoOperation.java:44)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.OutputReceiver.process(OutputReceiver.java:49)
    at org.apache.beam.runners.dataflow.worker.SimpleParDoFn$1.output(SimpleParDoFn.java:272)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.outputWindowedValue(SimpleDoFnRunner.java:309)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.access$700(SimpleDoFnRunner.java:77)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:621)
    at org.apache.beam.sdk.transforms.DoFnOutputReceivers$WindowedContextOutputReceiver.output(DoFnOutputReceivers.java:71)
    at org.apache.beam.sdk.transforms.MapElements$1.processElement(MapElements.java:122)
    at org.apache.beam.sdk.transforms.MapElements$1$DoFnInvoker.invokeProcessElement(Unknown Source)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.invokeProcessElement(SimpleDoFnRunner.java:275)
    at org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.processElement(SimpleDoFnRunner.java:240)
    at org.apache.beam.runners.dataflow.worker.SimpleParDoFn.processElement(SimpleParDoFn.java:325)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoOperation.process(ParDoOperation.java:44)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.OutputReceiver.process(OutputReceiver.java:49)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.ReadOperation.runReadLoop(ReadOperation.java:201)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.ReadOperation.start(ReadOperation.java:159)
    at org.apache.beam.runners.dataflow.worker.util.common.worker.MapTaskExecutor.execute(MapTaskExecutor.java:76)
    at org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.process(StreamingDataflowWorker.java:1233)
    at org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.access$1000(StreamingDataflowWorker.java:144)
    at org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker$6.run(StreamingDataflowWorker.java:972)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: <eval>:18 TypeError: Cannot read property "domain" from undefined
    at jdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:57)
    at jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:213)
    at jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:185)
    at jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:172)
    at jdk.nashorn.internal.runtime.Undefined.get(Undefined.java:157)
    at jdk.nashorn.internal.scripts.Script$Recompilation$1$7667A$\^eval\_.transform(<eval>:18)
    at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:639)
    at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494)
    at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
    at jdk.nashorn.api.scripting.ScriptObjectMirror.callMember(ScriptObjectMirror.java:199)
    at jdk.nashorn.api.scripting.NashornScriptEngine.invokeImpl(NashornScriptEngine.java:386)
    ... 42 more

当我通过传递一些示例数据在本地尝试 Javascript 时，它按预期工作，没有任何错误。

更新

事实证明，Pub/Sub 发送包装在 " 中的数据，所以我必须从字符串的开头和最后删除它们。而且 JSON 中的每个 " 都用 \ 进行了转义，因此我也必须在为了继续没有任何错误。

Answer 1

事实证明，Pub/Sub 发送了包装在 " 中的数据，所以我不得不从字符串的开头和结尾删除它们。此外，JSON 中的每个 " 都被 \ 转义，因此我也必须删除它们才能继续没有任何错误。

Answer 2

您的 JavaScript 代码似乎有错误。

data['domain'] = obj['data']['domain']; // line 18

抛出以下错误

TypeError: Cannot read property "domain" from undefined in <eval> at line number 18

如果变量没有在某处重新初始化，您可以在发布到 Pub/Sub 时尝试将 JSON 放入 单行 即

{"name":"Sam","age":21}