/
JsonStreamWriter.java
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/
JsonStreamWriter.java
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/*
* Copyright 2020 Google LLC
*
* Licensed 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 com.google.cloud.bigquery.storage.v1alpha2;
import com.google.api.core.ApiFuture;
import com.google.api.gax.batching.BatchingSettings;
import com.google.api.gax.core.CredentialsProvider;
import com.google.api.gax.core.ExecutorProvider;
import com.google.api.gax.retrying.RetrySettings;
import com.google.api.gax.rpc.TransportChannelProvider;
import com.google.cloud.bigquery.storage.v1alpha2.ProtoBufProto.ProtoRows;
import com.google.cloud.bigquery.storage.v1alpha2.Storage.AppendRowsRequest;
import com.google.cloud.bigquery.storage.v1alpha2.Storage.AppendRowsResponse;
import com.google.common.base.Preconditions;
import com.google.protobuf.Descriptors;
import com.google.protobuf.Descriptors.Descriptor;
import com.google.protobuf.Int64Value;
import com.google.protobuf.Message;
import java.io.IOException;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
import org.json.JSONArray;
import org.json.JSONObject;
/**
* A StreamWriter that can write JSON data (JSONObjects) to BigQuery tables. The JsonStreamWriter is
* built on top of a StreamWriter, and it simply converts all JSON data to protobuf messages then
* calls StreamWriter's append() method to write to BigQuery tables. It maintains all StreamWriter
* functions, but also provides an additional feature: schema update support, where if the BigQuery
* table schema is updated, users will be able to ingest data on the new schema after some time (in
* order of minutes).
*/
public class JsonStreamWriter implements AutoCloseable {
private static String streamPatternString =
"projects/[^/]+/datasets/[^/]+/tables/[^/]+/streams/[^/]+";
private static Pattern streamPattern = Pattern.compile(streamPatternString);
private static final Logger LOG = Logger.getLogger(JsonStreamWriter.class.getName());
private BigQueryWriteClient client;
private String streamName;
private StreamWriter streamWriter;
private Descriptor descriptor;
private Table.TableSchema tableSchema;
/**
* Constructs the JsonStreamWriter
*
* @param builder The Builder object for the JsonStreamWriter
*/
private JsonStreamWriter(Builder builder)
throws Descriptors.DescriptorValidationException, IllegalArgumentException, IOException,
InterruptedException {
Matcher matcher = streamPattern.matcher(builder.streamName);
if (!matcher.matches()) {
throw new IllegalArgumentException("Invalid stream name: " + builder.streamName);
}
this.streamName = builder.streamName;
this.client = builder.client;
this.descriptor =
BQTableSchemaToProtoDescriptor.convertBQTableSchemaToProtoDescriptor(builder.tableSchema);
StreamWriter.Builder streamWriterBuilder;
if (this.client == null) {
streamWriterBuilder = StreamWriter.newBuilder(builder.streamName);
} else {
streamWriterBuilder = StreamWriter.newBuilder(builder.streamName, builder.client);
}
setStreamWriterSettings(
streamWriterBuilder,
builder.channelProvider,
builder.credentialsProvider,
builder.batchingSettings,
builder.retrySettings,
builder.executorProvider,
builder.endpoint);
this.streamWriter = streamWriterBuilder.build();
}
/**
* Writes a JSONArray that contains JSONObjects to the BigQuery table by first converting the JSON
* data to protobuf messages, then using StreamWriter's append() to write the data. If there is a
* schema update, the OnSchemaUpdateRunnable will be used to determine what actions to perform.
*
* @param jsonArr The JSON array that contains JSONObjects to be written
* @param allowUnknownFields if true, json data can have fields unknown to the BigQuery table.
* @return ApiFuture<AppendRowsResponse> returns an AppendRowsResponse message wrapped in an
* ApiFuture
*/
public ApiFuture<AppendRowsResponse> append(JSONArray jsonArr, boolean allowUnknownFields) {
return append(jsonArr, -1, allowUnknownFields);
}
/**
* Writes a JSONArray that contains JSONObjects to the BigQuery table by first converting the JSON
* data to protobuf messages, then using StreamWriter's append() to write the data. If there is a
* schema update, the OnSchemaUpdateRunnable will be used to determine what actions to perform.
*
* @param jsonArr The JSON array that contains JSONObjects to be written
* @param offset Offset for deduplication
* @param allowUnknownFields if true, json data can have fields unknown to the BigQuery table.
* @return ApiFuture<AppendRowsResponse> returns an AppendRowsResponse message wrapped in an
* ApiFuture
*/
public ApiFuture<AppendRowsResponse> append(
JSONArray jsonArr, long offset, boolean allowUnknownFields) {
ProtoRows.Builder rowsBuilder = ProtoRows.newBuilder();
// Any error in convertJsonToProtoMessage will throw an
// IllegalArgumentException/IllegalStateException/NullPointerException and will halt processing
// of JSON data.
for (int i = 0; i < jsonArr.length(); i++) {
JSONObject json = jsonArr.getJSONObject(i);
Message protoMessage =
JsonToProtoMessage.convertJsonToProtoMessage(this.descriptor, json, allowUnknownFields);
rowsBuilder.addSerializedRows(protoMessage.toByteString());
}
AppendRowsRequest.ProtoData.Builder data = AppendRowsRequest.ProtoData.newBuilder();
// Need to make sure refreshAppendAndSetDescriptor finish first before this can run
synchronized (this) {
data.setWriterSchema(ProtoSchemaConverter.convert(this.descriptor));
data.setRows(rowsBuilder.build());
final ApiFuture<AppendRowsResponse> appendResponseFuture =
this.streamWriter.append(
AppendRowsRequest.newBuilder()
.setProtoRows(data.build())
.setOffset(Int64Value.of(offset))
.build());
return appendResponseFuture;
}
}
/**
* Refreshes connection for a JsonStreamWriter by first flushing all remaining rows, then calling
* refreshAppend(), and finally setting the descriptor. All of these actions need to be performed
* atomically to avoid having synchronization issues with append(). Flushing all rows first is
* necessary since if there are rows remaining when the connection refreshes, it will send out the
* old writer schema instead of the new one.
*/
void refreshConnection()
throws IOException, InterruptedException, Descriptors.DescriptorValidationException {
synchronized (this) {
this.streamWriter.writeAllOutstanding();
this.streamWriter.refreshAppend();
this.descriptor =
BQTableSchemaToProtoDescriptor.convertBQTableSchemaToProtoDescriptor(this.tableSchema);
}
}
/**
* Gets streamName
*
* @return String
*/
public String getStreamName() {
return this.streamName;
}
/**
* Gets current descriptor
*
* @return Descriptor
*/
public Descriptor getDescriptor() {
return this.descriptor;
}
/** Sets all StreamWriter settings. */
private void setStreamWriterSettings(
StreamWriter.Builder builder,
@Nullable TransportChannelProvider channelProvider,
@Nullable CredentialsProvider credentialsProvider,
@Nullable BatchingSettings batchingSettings,
@Nullable RetrySettings retrySettings,
@Nullable ExecutorProvider executorProvider,
@Nullable String endpoint) {
if (channelProvider != null) {
builder.setChannelProvider(channelProvider);
}
if (credentialsProvider != null) {
builder.setCredentialsProvider(credentialsProvider);
}
if (batchingSettings != null) {
builder.setBatchingSettings(batchingSettings);
}
if (retrySettings != null) {
builder.setRetrySettings(retrySettings);
}
if (executorProvider != null) {
builder.setExecutorProvider(executorProvider);
}
if (endpoint != null) {
builder.setEndpoint(endpoint);
}
JsonStreamWriterOnSchemaUpdateRunnable jsonStreamWriterOnSchemaUpdateRunnable =
new JsonStreamWriterOnSchemaUpdateRunnable();
jsonStreamWriterOnSchemaUpdateRunnable.setJsonStreamWriter(this);
builder.setOnSchemaUpdateRunnable(jsonStreamWriterOnSchemaUpdateRunnable);
}
/**
* Setter for table schema. Used for schema updates.
*
* @param tableSchema
*/
void setTableSchema(Table.TableSchema tableSchema) {
this.tableSchema = tableSchema;
}
/**
* newBuilder that constructs a JsonStreamWriter builder with BigQuery client being initialized by
* StreamWriter by default.
*
* @param streamName name of the stream that must follow
* "projects/[^/]+/datasets/[^/]+/tables/[^/]+/streams/[^/]+"
* @param tableSchema The schema of the table when the stream was created, which is passed back
* through {@code WriteStream}
* @return Builder
*/
public static Builder newBuilder(String streamName, Table.TableSchema tableSchema) {
Preconditions.checkNotNull(streamName, "StreamName is null.");
Preconditions.checkNotNull(tableSchema, "TableSchema is null.");
return new Builder(streamName, tableSchema, null);
}
/**
* newBuilder that constructs a JsonStreamWriter builder.
*
* @param streamName name of the stream that must follow
* "projects/[^/]+/datasets/[^/]+/tables/[^/]+/streams/[^/]+"
* @param tableSchema The schema of the table when the stream was created, which is passed back
* through {@code WriteStream}
* @param client
* @return Builder
*/
public static Builder newBuilder(
String streamName, Table.TableSchema tableSchema, BigQueryWriteClient client) {
Preconditions.checkNotNull(streamName, "StreamName is null.");
Preconditions.checkNotNull(tableSchema, "TableSchema is null.");
Preconditions.checkNotNull(client, "BigQuery client is null.");
return new Builder(streamName, tableSchema, client);
}
/** Closes the underlying StreamWriter. */
@Override
public void close() {
this.streamWriter.close();
}
private class JsonStreamWriterOnSchemaUpdateRunnable extends OnSchemaUpdateRunnable {
private JsonStreamWriter jsonStreamWriter;
/**
* Setter for the jsonStreamWriter
*
* @param jsonStreamWriter
*/
public void setJsonStreamWriter(JsonStreamWriter jsonStreamWriter) {
this.jsonStreamWriter = jsonStreamWriter;
}
/** Getter for the jsonStreamWriter */
public JsonStreamWriter getJsonStreamWriter() {
return this.jsonStreamWriter;
}
@Override
public void run() {
this.getJsonStreamWriter().setTableSchema(this.getUpdatedSchema());
try {
this.getJsonStreamWriter().refreshConnection();
} catch (InterruptedException | IOException e) {
LOG.severe("StreamWriter failed to refresh upon schema update." + e);
return;
} catch (Descriptors.DescriptorValidationException e) {
LOG.severe(
"Schema update fail: updated schema could not be converted to a valid descriptor.");
return;
}
LOG.info("Successfully updated schema: " + this.getUpdatedSchema());
}
}
public static final class Builder {
private String streamName;
private BigQueryWriteClient client;
private Table.TableSchema tableSchema;
private TransportChannelProvider channelProvider;
private CredentialsProvider credentialsProvider;
private BatchingSettings batchingSettings;
private RetrySettings retrySettings;
private ExecutorProvider executorProvider;
private String endpoint;
/**
* Constructor for JsonStreamWriter's Builder
*
* @param streamName name of the stream that must follow
* "projects/[^/]+/datasets/[^/]+/tables/[^/]+/streams/[^/]+"
* @param tableSchema schema used to convert Json to proto messages.
* @param client
*/
private Builder(String streamName, Table.TableSchema tableSchema, BigQueryWriteClient client) {
this.streamName = streamName;
this.tableSchema = tableSchema;
this.client = client;
}
/**
* Setter for the underlying StreamWriter's TransportChannelProvider.
*
* @param channelProvider
* @return Builder
*/
public Builder setChannelProvider(TransportChannelProvider channelProvider) {
this.channelProvider =
Preconditions.checkNotNull(channelProvider, "ChannelProvider is null.");
return this;
}
/**
* Setter for the underlying StreamWriter's CredentialsProvider.
*
* @param credentialsProvider
* @return Builder
*/
public Builder setCredentialsProvider(CredentialsProvider credentialsProvider) {
this.credentialsProvider =
Preconditions.checkNotNull(credentialsProvider, "CredentialsProvider is null.");
return this;
}
/**
* Setter for the underlying StreamWriter's BatchingSettings.
*
* @param batchingSettings
* @return Builder
*/
public Builder setBatchingSettings(BatchingSettings batchingSettings) {
this.batchingSettings =
Preconditions.checkNotNull(batchingSettings, "BatchingSettings is null.");
return this;
}
/**
* Setter for the underlying StreamWriter's RetrySettings.
*
* @param retrySettings
* @return Builder
*/
public Builder setRetrySettings(RetrySettings retrySettings) {
this.retrySettings = Preconditions.checkNotNull(retrySettings, "RetrySettings is null.");
return this;
}
/**
* Setter for the underlying StreamWriter's ExecutorProvider.
*
* @param executorProvider
* @return Builder
*/
public Builder setExecutorProvider(ExecutorProvider executorProvider) {
this.executorProvider =
Preconditions.checkNotNull(executorProvider, "ExecutorProvider is null.");
return this;
}
/**
* Setter for the underlying StreamWriter's Endpoint.
*
* @param endpoint
* @return Builder
*/
public Builder setEndpoint(String endpoint) {
this.endpoint = Preconditions.checkNotNull(endpoint, "Endpoint is null.");
return this;
}
/**
* Builds JsonStreamWriter
*
* @return JsonStreamWriter
*/
public JsonStreamWriter build()
throws Descriptors.DescriptorValidationException, IllegalArgumentException, IOException,
InterruptedException {
return new JsonStreamWriter(this);
}
}
}