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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hadoop.pig;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.yahoo.vespa.hadoop.mapreduce.VespaOutputFormat;
import com.yahoo.vespa.hadoop.mapreduce.util.TupleTools;
import com.yahoo.vespa.hadoop.mapreduce.util.VespaConfiguration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.pig.ResourceSchema;
import org.apache.pig.StoreFunc;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.impl.util.UDFContext;
import java.io.*;
import java.util.Base64;
import java.util.Map;
import java.util.Properties;
/**
* A small Pig UDF wrapper around the Vespa http client for
* feeding data into a Vespa endpoint.
*
* @author lesters
*/
@SuppressWarnings("rawtypes")
public class VespaStorage extends StoreFunc {
private final boolean createDocOp;
private final String template;
private final VespaDocumentOperation.Operation operation;
private String signature = null;
private RecordWriter recordWriter = null;
private ResourceSchema resourceSchema = null;
private static final String PROPERTY_CREATE_DOC_OP = "create-document-operation";
private static final String PROPERTY_ID_TEMPLATE = "docid";
private static final String PROPERTY_OPERATION = "operation";
private static final String PROPERTY_RESOURCE_SCHEMA = "resource_schema";
Properties properties = new Properties();
public VespaStorage() {
createDocOp = false;
template = null;
operation = null;
}
public VespaStorage(String... params) {
properties = VespaConfiguration.loadProperties(params);
createDocOp = Boolean.parseBoolean(properties.getProperty(PROPERTY_CREATE_DOC_OP, "false"));
operation = VespaDocumentOperation.Operation.fromString(properties.getProperty(PROPERTY_OPERATION, "put"));
template = properties.getProperty(PROPERTY_ID_TEMPLATE);
}
@Override
public OutputFormat getOutputFormat() throws IOException {
return new VespaOutputFormat(properties);
}
@Override
public void setStoreLocation(String endpoint, Job job) throws IOException {
properties.setProperty(VespaConfiguration.ENDPOINT, endpoint);
}
@Override
public void prepareToWrite(RecordWriter recordWriter) throws IOException {
this.recordWriter = recordWriter;
this.resourceSchema = getResourceSchema();
}
@SuppressWarnings("unchecked")
@Override
public void putNext(Tuple tuple) throws IOException {
if (tuple == null || tuple.size() == 0) {
return;
}
String data = null;
if (createDocOp) {
data = createDocumentOperation(tuple);
} else if (!tuple.isNull(0)) {
data = tuple.get(0).toString(); // assume single field with correctly formatted doc op.
}
if (data == null || data.length() == 0) {
return;
}
try {
recordWriter.write(0, data);
} catch (InterruptedException e) {
throw new IOException(e);
}
}
@Override
public void checkSchema(ResourceSchema resourceSchema) throws IOException {
setResourceSchema(resourceSchema);
}
@Override
public String relToAbsPathForStoreLocation(String endpoint, Path path) throws IOException {
return endpoint;
}
@Override
public void setStoreFuncUDFContextSignature(String s) {
this.signature = s;
}
@Override
public void cleanupOnFailure(String s, Job job) throws IOException {
}
@Override
public void cleanupOnSuccess(String s, Job job) throws IOException {
}
private ResourceSchema getResourceSchema() throws IOException {
Properties properties = getUDFProperties();
return base64Deserialize(properties.getProperty(PROPERTY_RESOURCE_SCHEMA));
}
private void setResourceSchema(ResourceSchema schema) throws IOException {
Properties properties = getUDFProperties();
if (properties.getProperty(PROPERTY_RESOURCE_SCHEMA) == null) {
properties.setProperty(PROPERTY_RESOURCE_SCHEMA, base64Serialize(schema));
}
}
private Properties getUDFProperties() {
String[] context = { signature };
return UDFContext.getUDFContext().getUDFProperties(getClass(), context);
}
private String createDocumentOperation(Tuple tuple) throws IOException {
if (tuple == null || tuple.size() == 0) {
return null;
}
if (resourceSchema == null) {
return null;
}
Map<String, Object> fields = TupleTools.tupleMap(resourceSchema, tuple);
String docId = TupleTools.toString(fields, template);
Schema schema = Schema.getPigSchema(resourceSchema);
return VespaDocumentOperation.create(operation, docId, fields, properties, schema);
}
public static String base64Serialize(ResourceSchema resourceSchema) throws IOException {
byte[] bytes = new ObjectMapper().writeValueAsBytes(resourceSchema);
return Base64.getEncoder().encodeToString(bytes);
}
public static ResourceSchema base64Deserialize(String s) throws IOException {
byte[] data = Base64.getDecoder().decode(s);
return new ObjectMapper().readValue(data, ResourceSchema.class);
}
}
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