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Updates ExpansionService to support dynamically discovering and expan…
…ding SchemaTransforms
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173 changes: 173 additions & 0 deletions
173
...n/java/org/apache/beam/sdk/expansion/service/ExpansionServiceSchemaTransformProvider.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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. | ||
| */ | ||
| package org.apache.beam.sdk.expansion.service; | ||
|
|
||
| import static org.apache.beam.runners.core.construction.BeamUrns.getUrn; | ||
|
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| import java.io.IOException; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.ServiceLoader; | ||
| import org.apache.beam.model.pipeline.v1.ExternalTransforms.ExpansionMethods; | ||
| import org.apache.beam.model.pipeline.v1.ExternalTransforms.SchemaTransformPayload; | ||
| import org.apache.beam.model.pipeline.v1.RunnerApi.FunctionSpec; | ||
| import org.apache.beam.sdk.coders.RowCoder; | ||
| import org.apache.beam.sdk.expansion.service.ExpansionService.TransformProvider; | ||
| import org.apache.beam.sdk.schemas.Schema; | ||
| import org.apache.beam.sdk.schemas.SchemaTranslation; | ||
| import org.apache.beam.sdk.transforms.PTransform; | ||
| import org.apache.beam.sdk.values.PBegin; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
| import org.apache.beam.sdk.values.PCollectionRowTuple; | ||
| import org.apache.beam.sdk.values.PCollectionTuple; | ||
| import org.apache.beam.sdk.values.PDone; | ||
| import org.apache.beam.sdk.values.PInput; | ||
| import org.apache.beam.sdk.values.POutput; | ||
| import org.apache.beam.sdk.values.Row; | ||
| import org.apache.beam.sdk.values.TupleTag; | ||
| import org.apache.beam.vendor.grpc.v1p48p1.com.google.protobuf.InvalidProtocolBufferException; | ||
|
|
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| @SuppressWarnings({"rawtypes"}) | ||
| public class ExpansionServiceSchemaTransformProvider implements TransformProvider { | ||
|
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| static final String DEFAULT_INPUT_TAG = "INPUT"; | ||
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| private Map<String, org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider> | ||
| schemaTransformProviders = new HashMap<>(); | ||
| private static ExpansionServiceSchemaTransformProvider transformProvider = null; | ||
|
|
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| private void loadSchemaTransforms() { | ||
| try { | ||
| for (org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider schemaTransformProvider : | ||
| ServiceLoader.load( | ||
| org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider.class)) { | ||
| if (schemaTransformProviders.containsKey(schemaTransformProvider.identifier())) { | ||
| throw new IllegalArgumentException( | ||
| "Found multiple SchemaTransformProvider implementations with the same identifier " | ||
| + schemaTransformProvider.identifier()); | ||
| } | ||
| schemaTransformProviders.put(schemaTransformProvider.identifier(), schemaTransformProvider); | ||
| } | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e.getMessage()); | ||
| } | ||
| } | ||
|
|
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| private ExpansionServiceSchemaTransformProvider() { | ||
| loadSchemaTransforms(); | ||
| } | ||
|
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| public static ExpansionServiceSchemaTransformProvider of() { | ||
| if (transformProvider == null) { | ||
| transformProvider = new ExpansionServiceSchemaTransformProvider(); | ||
| } | ||
|
|
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| return transformProvider; | ||
| } | ||
|
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| static class RowTransform extends PTransform { | ||
|
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| private PTransform<PCollectionRowTuple, PCollectionRowTuple> rowTuplePTransform; | ||
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| public RowTransform(PTransform<PCollectionRowTuple, PCollectionRowTuple> rowTuplePTransform) { | ||
| this.rowTuplePTransform = rowTuplePTransform; | ||
| } | ||
|
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| @Override | ||
| public POutput expand(PInput input) { | ||
| PCollectionRowTuple inputRowTuple; | ||
|
|
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| if (input instanceof PCollectionRowTuple) { | ||
| inputRowTuple = (PCollectionRowTuple) input; | ||
| } else if (input instanceof PCollection) { | ||
| inputRowTuple = PCollectionRowTuple.of(DEFAULT_INPUT_TAG, (PCollection) input); | ||
| } else if (input instanceof PBegin) { | ||
| inputRowTuple = PCollectionRowTuple.empty(input.getPipeline()); | ||
| } else if (input instanceof PCollectionTuple) { | ||
| inputRowTuple = PCollectionRowTuple.empty(input.getPipeline()); | ||
| PCollectionTuple inputTuple = (PCollectionTuple) input; | ||
| for (TupleTag<?> tag : inputTuple.getAll().keySet()) { | ||
| inputRowTuple = inputRowTuple.and(tag.getId(), (PCollection<Row>) inputTuple.get(tag)); | ||
| } | ||
| } else { | ||
| throw new RuntimeException(String.format("Unsupported input type: %s", input)); | ||
| } | ||
| PCollectionRowTuple output = inputRowTuple.apply(this.rowTuplePTransform); | ||
|
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| if (output.getAll().size() > 1) { | ||
| PCollectionTuple pcTuple = PCollectionTuple.empty(input.getPipeline()); | ||
| for (String key : output.getAll().keySet()) { | ||
| pcTuple = pcTuple.and(key, output.get(key)); | ||
| } | ||
| return pcTuple; | ||
| } else if (output.getAll().size() == 1) { | ||
| return output.getAll().values().iterator().next(); | ||
| } else { | ||
| return PDone.in(input.getPipeline()); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public PTransform getTransform(FunctionSpec spec) { | ||
| SchemaTransformPayload payload; | ||
| try { | ||
| payload = SchemaTransformPayload.parseFrom(spec.getPayload()); | ||
| String identifier = payload.getIdentifier(); | ||
| if (!schemaTransformProviders.containsKey(identifier)) { | ||
| throw new RuntimeException( | ||
| "Did not find a SchemaTransformProvider with the identifier " + identifier); | ||
| } | ||
|
|
||
| } catch (InvalidProtocolBufferException e) { | ||
| throw new IllegalArgumentException( | ||
| "Invalid payload type for URN " + getUrn(ExpansionMethods.Enum.SCHEMATRANSFORM), e); | ||
| } | ||
|
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| String identifier = payload.getIdentifier(); | ||
| org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider provider = | ||
| schemaTransformProviders.get(identifier); | ||
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| Schema configSchemaFromRequest = | ||
| SchemaTranslation.schemaFromProto((payload.getConfigurationSchema())); | ||
| Schema configSchemaFromProvider = provider.configurationSchema(); | ||
|
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| if (!configSchemaFromRequest.assignableTo(configSchemaFromProvider)) { | ||
| throw new IllegalArgumentException( | ||
| String.format( | ||
| "Config schema provided with the expansion request %s is not compatible with the " | ||
| + "config of the Schema transform %s.", | ||
| configSchemaFromRequest, configSchemaFromProvider)); | ||
| } | ||
|
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| Row configRow; | ||
| try { | ||
| configRow = | ||
| RowCoder.of(provider.configurationSchema()) | ||
| .decode(payload.getConfigurationRow().newInput()); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException("Error decoding payload", e); | ||
| } | ||
|
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| return new RowTransform(provider.from(configRow).buildTransform()); | ||
| } | ||
|
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| Iterable<org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider> getAllProviders() { | ||
| return schemaTransformProviders.values(); | ||
| } | ||
| } |
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