krisztina-zsihovszki commented on code in PR #6350: URL: https://github.com/apache/nifi/pull/6350#discussion_r960644266
########## nifi-nar-bundles/nifi-airtable-bundle/nifi-airtable-processors/src/main/java/org/apache/nifi/processors/airtable/QueryAirtableTable.java: ########## @@ -0,0 +1,422 @@ +/* + * 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.nifi.processors.airtable; + +import static org.apache.nifi.flowfile.attributes.FragmentAttributes.FRAGMENT_COUNT; +import static org.apache.nifi.flowfile.attributes.FragmentAttributes.FRAGMENT_ID; +import static org.apache.nifi.flowfile.attributes.FragmentAttributes.FRAGMENT_INDEX; +import static org.apache.nifi.processors.airtable.service.AirtableRestService.API_V0_BASE_URL; + +import java.io.ByteArrayInputStream; +import java.io.IOException; +import java.time.OffsetDateTime; +import java.time.format.DateTimeFormatter; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.UUID; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.stream.Collectors; +import org.apache.nifi.annotation.behavior.InputRequirement; +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement; +import org.apache.nifi.annotation.behavior.PrimaryNodeOnly; +import org.apache.nifi.annotation.behavior.Stateful; +import org.apache.nifi.annotation.behavior.TriggerSerially; +import org.apache.nifi.annotation.behavior.TriggerWhenEmpty; +import org.apache.nifi.annotation.behavior.WritesAttribute; +import org.apache.nifi.annotation.behavior.WritesAttributes; +import org.apache.nifi.annotation.configuration.DefaultSettings; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnScheduled; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.state.Scope; +import org.apache.nifi.components.state.StateMap; +import org.apache.nifi.expression.ExpressionLanguageScope; +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.flowfile.attributes.CoreAttributes; +import org.apache.nifi.processor.AbstractProcessor; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.processor.util.StandardValidators; +import org.apache.nifi.processors.airtable.record.AirtableRecordSet; +import org.apache.nifi.processors.airtable.record.AirtableJsonTreeRowRecordReaderFactory; +import org.apache.nifi.processors.airtable.service.AirtableGetRecordsParameters; +import org.apache.nifi.processors.airtable.service.AirtableRestService; +import org.apache.nifi.processors.airtable.service.AirtableRestService.RateLimitExceededException; +import org.apache.nifi.schema.access.SchemaNotFoundException; +import org.apache.nifi.serialization.JsonRecordReaderFactory; +import org.apache.nifi.serialization.MalformedRecordException; +import org.apache.nifi.serialization.RecordSetWriter; +import org.apache.nifi.serialization.RecordSetWriterFactory; +import org.apache.nifi.serialization.WriteResult; +import org.apache.nifi.serialization.record.RecordSchema; +import org.apache.nifi.serialization.record.RecordSet; +import org.apache.nifi.web.client.provider.api.WebClientServiceProvider; + +@PrimaryNodeOnly +@InputRequirement(Requirement.INPUT_FORBIDDEN) +@TriggerSerially +@TriggerWhenEmpty +@Tags({"airtable", "query", "database"}) +@CapabilityDescription("Query records from an Airtable table. Records are incrementally retrieved based on the last modified time of the records." + + " Records can also be further filtered by setting the 'Custom Filter' property which supports the formulas provided by the Airtable API." + + " Schema can be provided by setting up a JsonTreeReader controller service properly. This processor is intended to be run on the Primary Node only.") +@Stateful(scopes = Scope.CLUSTER, description = "The last successful query's time is stored in order to enable incremental loading." + + " The initial query returns all the records in the table and each subsequent query filters the records by their last modified time." + + " In other words, if a record is updated after the last successful query only the updated records will be returned in the next query." + + " State is stored across the cluster so that this Processor can be run on Primary Node only and if a new Primary Node is selected," + + " the new node can pick up where the previous node left off, without duplicating the data.") +@WritesAttributes({ + @WritesAttribute(attribute = "mime.type", description = "Sets the mime.type attribute to the MIME Type specified by the Record Writer."), + @WritesAttribute(attribute = "record.count", description = "Sets the number of records in the FlowFile.") +}) +@DefaultSettings(yieldDuration = "35 sec") +public class QueryAirtableTable extends AbstractProcessor { + + static final PropertyDescriptor API_URL = new PropertyDescriptor.Builder() + .name("api-url") + .displayName("API URL") + .description("The URL for the Airtable REST API including the domain and the path to the API (e.g. https://api.airtable.com/v0).") + .defaultValue(API_V0_BASE_URL) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .addValidator(StandardValidators.URL_VALIDATOR) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .required(true) + .build(); + + static final PropertyDescriptor API_KEY = new PropertyDescriptor.Builder() + .name("api-key") + .displayName("API Key") + .description("The REST API key to use in queries. Should be generated on Airtable's account page.") + .required(true) + .sensitive(true) + .expressionLanguageSupported(ExpressionLanguageScope.NONE) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .build(); + + static final PropertyDescriptor BASE_ID = new PropertyDescriptor.Builder() + .name("base-id") + .displayName("Base ID") + .description("The ID of the Airtable base to be queried.") + .required(true) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .build(); + + static final PropertyDescriptor TABLE_ID = new PropertyDescriptor.Builder() + .name("table-id") + .displayName("Table Name or ID") + .description("The name or the ID of the Airtable table to be queried.") + .required(true) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .build(); + + static final PropertyDescriptor FIELDS = new PropertyDescriptor.Builder() + .name("fields") + .displayName("Fields") + .description("Comma-separated list of fields to query from the table. Both the field's name and ID can be used.") + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .build(); + + static final PropertyDescriptor CUSTOM_FILTER = new PropertyDescriptor.Builder() + .name("custom-filter") + .displayName("Custom Filter") + .description("Filter records by Airtable's formulas.") + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .addValidator(StandardValidators.NON_BLANK_VALIDATOR) + .build(); + + static final PropertyDescriptor PAGE_SIZE = new PropertyDescriptor.Builder() + .name("page-size") + .displayName("Page Size") + .description("Number of records to be fetched in a page. Should be between 0 and 100 inclusively.") + .defaultValue("0") + .required(true) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .addValidator(StandardValidators.createLongValidator(0, 100, true)) + .build(); + + static final PropertyDescriptor MAX_RECORDS_PER_FLOW_FILE = new PropertyDescriptor.Builder() + .name("max-records-per-flow-file") + .displayName("Max Records Per Flow File") + .description("The maximum number of result records that will be included in a single FlowFile. This will allow you to break up very large" + + " result sets into multiple FlowFiles. If the value specified is zero, then all records are returned in a single FlowFile.") + .defaultValue("0") + .required(true) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .addValidator(StandardValidators.NON_NEGATIVE_INTEGER_VALIDATOR) + .build(); + + static final PropertyDescriptor OUTPUT_BATCH_SIZE = new PropertyDescriptor.Builder() + .name("output-batch-size") + .displayName("Output Batch Size") + .description("The number of output FlowFiles to queue before committing the process session. When set to zero, the session will be committed when all records" + + " have been processed and the output FlowFiles are ready for transfer to the downstream relationship. For large result sets, this can cause a large burst of FlowFiles" + + " to be transferred at the end of processor execution. If this property is set, then when the specified number of FlowFiles are ready for transfer, then the session will" + + " be committed, thus releasing the FlowFiles to the downstream relationship.") + .defaultValue("0") + .required(true) + .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY) + .addValidator(StandardValidators.NON_NEGATIVE_INTEGER_VALIDATOR) + .build(); + + static final PropertyDescriptor METADATA_STRATEGY = new PropertyDescriptor.Builder() + .name("metadata-strategy") + .displayName("Metadata Strategy") + .description("Strategy to use for fetching record schema. Currently only 'Use JSON Record Reader' is supported." + + " When Airtable Metadata API becomes more stable it will be possible to fetch the record schema through it.") + .required(true) + .defaultValue(MetadataStrategy.USE_JSON_RECORD_READER.name()) + .allowableValues(MetadataStrategy.class) + .build(); + + static final PropertyDescriptor SCHEMA_READER = new PropertyDescriptor.Builder() + .name("schema-reader") + .displayName("Schema Reader") + .description("JsonTreeReader service to use for fetching the schema of records returned by the Airtable REST API") + .dependsOn(METADATA_STRATEGY, MetadataStrategy.USE_JSON_RECORD_READER.name()) + .identifiesControllerService(JsonRecordReaderFactory.class) + .required(true) + .build(); + + static final PropertyDescriptor RECORD_WRITER = new PropertyDescriptor.Builder() + .name("record-writer") + .displayName("Record Writer") + .description("Service used for writing records returned by the Airtable REST API") + .identifiesControllerService(RecordSetWriterFactory.class) + .required(true) + .build(); + + static final PropertyDescriptor WEB_CLIENT_SERVICE_PROVIDER = new PropertyDescriptor.Builder() + .name("web-client-service-provider") + .displayName("Web Client Service Provider") + .description("Web Client Service Provider to use for Airtable REST API requests") + .identifiesControllerService(WebClientServiceProvider.class) + .required(true) + .build(); + + static final Relationship REL_SUCCESS = new Relationship.Builder() + .name("success") + .description("For FlowFiles created as a result of a successful query.") + .build(); + + private static final List<PropertyDescriptor> PROPERTIES = Collections.unmodifiableList(Arrays.asList( + API_URL, + API_KEY, + BASE_ID, + TABLE_ID, + FIELDS, + CUSTOM_FILTER, + PAGE_SIZE, + MAX_RECORDS_PER_FLOW_FILE, + OUTPUT_BATCH_SIZE, + METADATA_STRATEGY, + SCHEMA_READER, + RECORD_WRITER, + WEB_CLIENT_SERVICE_PROVIDER + )); + + private static final Set<Relationship> RELATIONSHIPS = Collections.singleton(REL_SUCCESS); + + private static final String LAST_RECORD_FETCH_TIME = "last_record_fetch_time"; + private static final int QUERY_LAG_SECONDS = 1; + + private volatile AirtableRestService airtableRestService; + + @Override + protected List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return PROPERTIES; + } + + @Override + public Set<Relationship> getRelationships() { + return RELATIONSHIPS; + } + + @OnScheduled + public void onScheduled(final ProcessContext context) { + final String apiUrl = context.getProperty(API_URL).evaluateAttributeExpressions().getValue(); + final String apiKey = context.getProperty(API_KEY).getValue(); + final String baseId = context.getProperty(BASE_ID).evaluateAttributeExpressions().getValue(); + final String tableId = context.getProperty(TABLE_ID).evaluateAttributeExpressions().getValue(); + final WebClientServiceProvider webClientServiceProvider = context.getProperty(WEB_CLIENT_SERVICE_PROVIDER).asControllerService(WebClientServiceProvider.class); + airtableRestService = new AirtableRestService(webClientServiceProvider.getWebClientService(), apiUrl, apiKey, baseId, tableId); + } + + @Override + public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException { + final JsonRecordReaderFactory schemaRecordReaderFactory = context.getProperty(SCHEMA_READER).asControllerService(JsonRecordReaderFactory.class); + final RecordSetWriterFactory writerFactory = context.getProperty(RECORD_WRITER).asControllerService(RecordSetWriterFactory.class); + final Integer maxRecordsPerFlowFile = context.getProperty(MAX_RECORDS_PER_FLOW_FILE).evaluateAttributeExpressions().asInteger(); + final Integer outputBatchSize = context.getProperty(OUTPUT_BATCH_SIZE).evaluateAttributeExpressions().asInteger(); + + final StateMap state; + try { + state = context.getStateManager().getState(Scope.CLUSTER); + } catch (IOException e) { + throw new ProcessException("Failed to get cluster state", e); + } + + final String lastRecordFetchDateTime = state.get(LAST_RECORD_FETCH_TIME); + final String currentRecordFetchDateTime = OffsetDateTime.now().minusSeconds(QUERY_LAG_SECONDS).format(DateTimeFormatter.ISO_OFFSET_DATE_TIME); + + final AirtableGetRecordsParameters getRecordsParameters = buildGetRecordsParameters(context, lastRecordFetchDateTime, currentRecordFetchDateTime); + final byte[] recordsJson; + try { + recordsJson = airtableRestService.getRecords(getRecordsParameters); + } catch (RateLimitExceededException e) { + context.yield(); + throw new ProcessException("REST API rate limit exceeded while fetching initial Airtable record set", e); + } + + final FlowFile flowFile = session.create(); + final Map<String, String> originalAttributes = flowFile.getAttributes(); + + final RecordSchema recordSchema; + final RecordSchema writerSchema; + try { + final ByteArrayInputStream recordsStream = new ByteArrayInputStream(recordsJson); + recordSchema = schemaRecordReaderFactory.createRecordReader(flowFile, recordsStream, getLogger()).getSchema(); + writerSchema = writerFactory.getSchema(originalAttributes, recordSchema); + } catch (MalformedRecordException | IOException | SchemaNotFoundException e) { + throw new ProcessException("Couldn't get record schema", e); + } + + session.remove(flowFile); + + final List<FlowFile> flowFiles = new ArrayList<>(); + int totalRecordCount = 0; + final AirtableJsonTreeRowRecordReaderFactory recordReaderFactory = new AirtableJsonTreeRowRecordReaderFactory(getLogger(), recordSchema); + try (final AirtableRecordSet airtableRecordSet = new AirtableRecordSet(recordsJson, recordReaderFactory, airtableRestService, getRecordsParameters)) { + while (true) { + final AtomicInteger recordCountHolder = new AtomicInteger(); + final Map<String, String> attributes = new HashMap<>(); + FlowFile flowFileToAdd = session.create(); + flowFileToAdd = session.write(flowFileToAdd, out -> { + try (final RecordSetWriter writer = writerFactory.createWriter(getLogger(), writerSchema, out, originalAttributes)) { + final RecordSet recordSet = (maxRecordsPerFlowFile > 0 ? airtableRecordSet.limit(maxRecordsPerFlowFile) : airtableRecordSet); + final WriteResult writeResult = writer.write(recordSet); + + attributes.put("record.count", String.valueOf(writeResult.getRecordCount())); + attributes.put(CoreAttributes.MIME_TYPE.key(), writer.getMimeType()); + attributes.putAll(writeResult.getAttributes()); + + recordCountHolder.set(writeResult.getRecordCount()); + } catch (final IOException e) { + final Throwable cause = e.getCause(); + if (cause instanceof RateLimitExceededException) { + context.yield(); + throw new ProcessException("REST API rate limit exceeded while reading Airtable records", cause); + } + throw new ProcessException("Couldn't read records from input", e); + } catch (final SchemaNotFoundException e) { + throw new ProcessException("Couldn't read records from input", e); + } + }); + + flowFileToAdd = session.putAllAttributes(flowFileToAdd, attributes); + + final int recordCount = recordCountHolder.get(); + if (recordCount > 0) { + totalRecordCount += recordCount; + flowFiles.add(flowFileToAdd); + if (outputBatchSize > 0 && flowFiles.size() == outputBatchSize) { + transferFlowFiles(flowFiles, session, totalRecordCount); + flowFiles.clear(); + } + continue; + } + + session.remove(flowFileToAdd); + + if (maxRecordsPerFlowFile > 0 && outputBatchSize == 0) { + fragmentFlowFiles(session, flowFiles); + } + + transferFlowFiles(flowFiles, session, totalRecordCount); + break; + } + } catch (final IOException e) { + throw new ProcessException("Couldn't read records from input", e); + } + + if (totalRecordCount == 0) { + return; + } + + final Map<String, String> newState = new HashMap<>(state.toMap()); + newState.put(LAST_RECORD_FETCH_TIME, currentRecordFetchDateTime); + try { + context.getStateManager().setState(newState, Scope.CLUSTER); + } catch (IOException e) { + throw new ProcessException("Failed to update cluster state", e); + } + } + + private AirtableGetRecordsParameters buildGetRecordsParameters(final ProcessContext context, + final String lastRecordFetchTime, + final String nowDateTimeString) { + final String fieldsProperty = context.getProperty(FIELDS).evaluateAttributeExpressions().getValue(); + final String customFilter = context.getProperty(CUSTOM_FILTER).evaluateAttributeExpressions().getValue(); + final Integer pageSize = context.getProperty(PAGE_SIZE).evaluateAttributeExpressions().asInteger(); + + final AirtableGetRecordsParameters.Builder getRecordsParametersBuilder = new AirtableGetRecordsParameters.Builder(); + if (lastRecordFetchTime != null) { + getRecordsParametersBuilder + .modifiedAfter(lastRecordFetchTime) + .modifiedBefore(nowDateTimeString); + } + if (fieldsProperty != null) { + getRecordsParametersBuilder.fields(Arrays.stream(fieldsProperty.split(",")).map(String::trim).collect(Collectors.toList())); + } + getRecordsParametersBuilder.customFilter(customFilter); + if (pageSize != null && pageSize > 0) { + getRecordsParametersBuilder.pageSize(pageSize); + } + + return getRecordsParametersBuilder.build(); + } + + private void fragmentFlowFiles(final ProcessSession session, final List<FlowFile> flowFiles) { + final String fragmentIdentifier = UUID.randomUUID().toString(); + for (int i = 0; i < flowFiles.size(); i++) { + final Map<String, String> fragmentAttributes = new HashMap<>(); + fragmentAttributes.put(FRAGMENT_ID.key(), fragmentIdentifier); Review Comment: Please mention the "fragment.*" attributes as well in @WritesAttributes. -- This is an automated message from the Apache Git Service. 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