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Kafka: Integrating Engine tables with Kafka
//
// Copyright (c) 2016-2024 Deephaven Data Labs and Patent Pending
//
package io.deephaven.kafka;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.confluent.kafka.schemaregistry.SchemaProvider;
import io.confluent.kafka.schemaregistry.client.SchemaRegistryClient;
import io.deephaven.UncheckedDeephavenException;
import io.deephaven.engine.table.ColumnDefinition;
import io.deephaven.engine.table.Table;
import io.deephaven.engine.table.TableDefinition;
import io.deephaven.kafka.KafkaTools.Consume;
import io.deephaven.kafka.KafkaTools.KeyOrValue;
import io.deephaven.kafka.KafkaTools.KeyOrValueIngestData;
import io.deephaven.kafka.KafkaTools.Produce;
import io.deephaven.kafka.ingest.JsonNodeChunkAdapter;
import io.deephaven.kafka.ingest.JsonNodeUtil;
import io.deephaven.kafka.ingest.KeyOrValueProcessor;
import io.deephaven.kafka.publish.JsonKeyOrValueSerializer;
import io.deephaven.kafka.publish.KeyOrValueSerializer;
import io.deephaven.stream.StreamChunkUtils;
import io.deephaven.util.mutable.MutableInt;
import org.apache.kafka.common.serialization.Deserializer;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.apache.kafka.common.serialization.StringSerializer;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
class JsonImpl {
/**
* JSON spec.
*/
static final class JsonConsume extends Consume.KeyOrValueSpec {
@Nullable
private final ObjectMapper objectMapper;
private final ColumnDefinition[] columnDefinitions;
private final Map fieldToColumnName;
JsonConsume(
@NotNull final ColumnDefinition[] columnDefinitions,
@Nullable final Map fieldNameToColumnName,
@Nullable final ObjectMapper objectMapper) {
this.columnDefinitions = columnDefinitions;
this.fieldToColumnName = mapNonPointers(fieldNameToColumnName);
this.objectMapper = objectMapper;
}
@Override
public Optional getSchemaProvider() {
return Optional.empty();
}
@Override
protected Deserializer getDeserializer(KeyOrValue keyOrValue, SchemaRegistryClient schemaRegistryClient,
Map configs) {
return new StringDeserializer();
}
@Override
protected KeyOrValueIngestData getIngestData(KeyOrValue keyOrValue,
SchemaRegistryClient schemaRegistryClient, Map configs, MutableInt nextColumnIndexMut,
List> columnDefinitionsOut) {
final KeyOrValueIngestData data = new KeyOrValueIngestData();
data.toObjectChunkMapper = jsonToObjectChunkMapper(objectMapper);
columnDefinitionsOut.addAll(Arrays.asList(columnDefinitions));
// Populate out field to column name mapping from two potential sources.
data.fieldPathToColumnName = new HashMap<>(columnDefinitions.length);
final Set coveredColumns = new HashSet<>(columnDefinitions.length);
if (fieldToColumnName != null) {
for (final Map.Entry entry : fieldToColumnName.entrySet()) {
final String colName = entry.getValue();
data.fieldPathToColumnName.put(entry.getKey(), colName);
coveredColumns.add(colName);
}
}
for (final ColumnDefinition colDef : columnDefinitions) {
final String colName = colDef.getName();
if (!coveredColumns.contains(colName)) {
final String jsonPtrStr =
JsonImpl.JsonConsume.mapFieldNameToJsonPointerStr(colName);
data.fieldPathToColumnName.put(jsonPtrStr, colName);
}
}
return data;
}
@Override
protected KeyOrValueProcessor getProcessor(TableDefinition tableDef, KeyOrValueIngestData data) {
return JsonNodeChunkAdapter.make(
tableDef,
ci -> StreamChunkUtils.chunkTypeForColumnIndex(tableDef, ci),
data.fieldPathToColumnName,
true);
}
private static Map mapNonPointers(final Map fieldNameToColumnName) {
if (fieldNameToColumnName == null) {
return null;
}
final boolean needsMapping =
fieldNameToColumnName.keySet().stream().anyMatch(key -> !key.startsWith("/"));
if (!needsMapping) {
return fieldNameToColumnName;
}
final Map ans = new HashMap<>(fieldNameToColumnName.size());
for (Map.Entry entry : fieldNameToColumnName.entrySet()) {
final String key = entry.getKey();
if (key.startsWith("/")) {
ans.put(key, entry.getValue());
} else {
ans.put(mapFieldNameToJsonPointerStr(key), entry.getValue());
}
}
return ans;
}
/***
* JSON field names (or "key") can be any string, so in principle they can contain the '/' character. JSON
* Pointers assign special meaning to the '/' character, so actual '/' in the key they need to be encoded
* differently. The spec for JSON Pointers (see RFC 6901) tells us to encode '/' using "~1". If we need the '~'
* character we have to encode that as "~0". This method does this simple JSON Pointer encoding.
*
* @param key an arbitrary JSON field name, that can potentially contain the '/' or '~' characters.
* @return a JSON Pointer encoded as a string for the provided key.
*/
public static String mapFieldNameToJsonPointerStr(final String key) {
return "/" + key.replace("~", "~0").replace("/", "~1");
}
}
/**
* JSON spec.
*/
static final class JsonProduce extends Produce.KeyOrValueSpec {
private final String[] includeColumns;
private final Predicate excludeColumns;
private final Map columnNameToFieldName;
private final String nestedObjectDelimiter;
private final boolean outputNulls;
private final String timestampFieldName;
JsonProduce(final String[] includeColumns,
final Predicate excludeColumns,
final Map columnNameToFieldName,
final String nestedObjectDelimiter,
final boolean outputNulls,
final String timestampFieldName) {
this.includeColumns = includeColumns;
this.excludeColumns = excludeColumns;
this.columnNameToFieldName = columnNameToFieldName;
this.nestedObjectDelimiter = nestedObjectDelimiter;
this.outputNulls = outputNulls;
this.timestampFieldName = timestampFieldName;
}
@Override
public Optional getSchemaProvider() {
return Optional.empty();
}
@Override
Serializer getSerializer(SchemaRegistryClient schemaRegistryClient, TableDefinition definition) {
return new StringSerializer();
}
@Override
String[] getColumnNames(@NotNull Table t, SchemaRegistryClient schemaRegistryClient) {
if (excludeColumns != null && includeColumns != null) {
throw new IllegalArgumentException(
"Can't have both excludeColumns and includeColumns not null");
}
final String[] tableColumnNames = t.getDefinition().getColumnNamesArray();
if (excludeColumns == null && includeColumns == null) {
return tableColumnNames;
}
final Set tableColumnsSet = new HashSet<>(Arrays.asList(tableColumnNames));
if (includeColumns != null) {
// Validate includes
final List missing = Arrays.stream(includeColumns)
.filter(cn -> !tableColumnsSet.contains(cn)).collect(Collectors.toList());
if (!missing.isEmpty()) {
throw new IllegalArgumentException(
"includeColumns contains names not found in table columns: " + missing);
}
return includeColumns;
}
return Arrays.stream(tableColumnNames)
.filter(cn -> !excludeColumns.test(cn)).toArray(String[]::new);
}
@Override
KeyOrValueSerializer getKeyOrValueSerializer(@NotNull Table t, @NotNull String[] columnNames) {
final String[] fieldNames = getFieldNames(columnNames);
return new JsonKeyOrValueSerializer(
t, columnNames, fieldNames,
timestampFieldName, nestedObjectDelimiter, outputNulls);
}
String[] getFieldNames(final String[] columnNames) {
final String[] fieldNames = new String[columnNames.length];
for (int i = 0; i < columnNames.length; ++i) {
if (columnNameToFieldName == null) {
fieldNames[i] = columnNames[i];
} else {
fieldNames[i] = columnNameToFieldName.getOrDefault(columnNames[i], columnNames[i]);
}
}
return fieldNames;
}
}
private static Function jsonToObjectChunkMapper(@Nullable final ObjectMapper mapper) {
return (final Object in) -> {
final String json;
try {
json = (String) in;
} catch (ClassCastException ex) {
throw new UncheckedDeephavenException("Could not convert input to json string", ex);
}
return JsonNodeUtil.makeJsonNode(mapper, json);
};
}
}
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