LanceNamespaceClient.java
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package org.apache.doris.datasource.lance;
import org.apache.doris.common.DdlException;
import org.apache.doris.datasource.lance.metadata.LanceTableAccess;
import org.apache.doris.datasource.lance.storage.LanceStorageOptions;
import org.apache.doris.datasource.property.metastore.AbstractLanceProperties;
import org.apache.doris.datasource.property.storage.StorageProperties;
import org.apache.commons.lang3.StringUtils;
import org.lance.namespace.LanceNamespace;
import org.lance.namespace.errors.NamespaceNotFoundException;
import org.lance.namespace.errors.TableNotFoundException;
import org.lance.namespace.model.DescribeTableRequest;
import org.lance.namespace.model.DescribeTableResponse;
import org.lance.namespace.model.ListNamespacesRequest;
import org.lance.namespace.model.ListNamespacesResponse;
import org.lance.namespace.model.ListTablesRequest;
import org.lance.namespace.model.ListTablesResponse;
import org.lance.namespace.model.TableExistsRequest;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
/**
* Namespace requests and table access resolution. The catalog client owns the native resources
* and holds a Lease throughout each call to this client.
*/
final class LanceNamespaceClient {
private static final String DATABASE_NAMESPACE_DELIMITER = ".";
private static final int PAGE_SIZE = 1000;
private static final String LANCE_REST = AbstractLanceProperties.LANCE_REST;
private final LanceNamespace namespace;
private final String catalogType;
private final String rootDatabase;
private final List<String> parentNamespace;
private final List<StorageProperties> storageProperties;
private final Object namespaceLock = new Object();
LanceNamespaceClient(LanceNamespace namespace, String catalogType, String rootDatabase,
List<String> parentNamespace, List<StorageProperties> storageProperties) {
this.namespace = namespace;
this.catalogType = catalogType;
this.rootDatabase = rootDatabase;
this.parentNamespace = Collections.unmodifiableList(new ArrayList<>(parentNamespace));
this.storageProperties = Collections.unmodifiableList(new ArrayList<>(storageProperties));
}
List<String> listDatabaseNames() {
// The configured root database represents the empty relative Lance namespace.
LinkedHashSet<String> databases = new LinkedHashSet<>();
databases.add(rootDatabase);
// Breadth-first traversal starts at the catalog's configured parent namespace.
// Queue entries remain relative so they can be exposed as Doris database names.
Queue<List<String>> queue = new ArrayDeque<>();
queue.add(Collections.emptyList());
Set<List<String>> visited = new HashSet<>();
while (!queue.isEmpty()) {
List<String> relativeParent = queue.remove();
if (!visited.add(relativeParent)) {
continue;
}
// The Lance API expects a full namespace, including the configured parent.
List<String> fullParentNamespace = buildFullNamespace(relativeParent);
for (String child : listChildNamespaces(fullParentNamespace)) {
List<String> relativeChild = new ArrayList<>(relativeParent);
relativeChild.add(child);
// Doris exposes each hierarchical relative namespace as one flat database name.
databases.add(LanceNamespaceName.namespaceToDorisDatabaseName(
relativeChild, DATABASE_NAMESPACE_DELIMITER, rootDatabase));
// Visit this child later to discover namespaces nested below it.
queue.add(relativeChild);
}
}
return new ArrayList<>(databases);
}
/**
* Lists all direct child namespace names under the given full Lance namespace.
*
* <p>Each request asks for at most {@link #PAGE_SIZE} children. If Lance returns a
* page token, this method keeps requesting subsequent pages until all children are collected.
*/
private List<String> listChildNamespaces(List<String> namespaceId) {
List<String> result = new ArrayList<>();
String pageToken = null;
Set<String> consumedTokens = new HashSet<>();
do {
ListNamespacesRequest request = new ListNamespacesRequest().id(namespaceId).limit(PAGE_SIZE);
if (pageToken != null) {
request.pageToken(pageToken);
}
ListNamespacesResponse response;
synchronized (namespaceLock) {
response = namespace.listNamespaces(request);
}
if (response.getNamespaces() != null) {
result.addAll(response.getNamespaces());
}
pageToken = response.getPageToken();
if (StringUtils.isNotEmpty(pageToken) && !consumedTokens.add(pageToken)) {
throw new IllegalStateException("Lance namespace repeated a pagination token");
}
} while (StringUtils.isNotEmpty(pageToken));
return result;
}
List<String> listTableNames(String dbName) {
try {
List<String> namespaceId = buildNamespaceId(dbName);
List<String> result = new ArrayList<>();
String pageToken = null;
Set<String> consumedTokens = new HashSet<>();
do {
ListTablesRequest request = new ListTablesRequest().id(namespaceId).limit(PAGE_SIZE);
if (pageToken != null) {
request.pageToken(pageToken);
}
ListTablesResponse response;
synchronized (namespaceLock) {
response = namespace.listTables(request);
}
if (response.getTables() != null) {
result.addAll(response.getTables());
}
pageToken = response.getPageToken();
if (StringUtils.isNotEmpty(pageToken) && !consumedTokens.add(pageToken)) {
throw new IllegalStateException("Lance namespace repeated a pagination token");
}
} while (StringUtils.isNotEmpty(pageToken));
return result;
} catch (DdlException e) {
throw new RuntimeException(e);
}
}
boolean tableExists(String dbName, String tblName) {
try {
List<String> tableId = buildTableId(dbName, tblName);
TableExistsRequest request = new TableExistsRequest().id(tableId);
synchronized (namespaceLock) {
namespace.tableExists(request);
}
return true;
} catch (TableNotFoundException | NamespaceNotFoundException e) {
return false;
} catch (DdlException e) {
throw new RuntimeException(e);
}
}
LanceTableAccess resolveTableAccess(String dbName, String tableName) {
DescribeTableResponse table = describeTable(dbName, tableName);
if (Boolean.TRUE.equals(table.getManagedVersioning())) {
throw new UnsupportedOperationException(
"Lance managed versioning is not supported by the current BE reader");
}
String datasetUri = StringUtils.firstNonBlank(table.getTableUri(), table.getLocation());
if (datasetUri == null) {
throw new RuntimeException("Lance namespace returned no table URI for " + dbName + "." + tableName);
}
// One option map serves both readers: the FE opens the dataset through the Lance Java SDK
// and the BE through lance-c, so neither can end up with credentials the other lacks. The
// dataset URL picks the option vocabulary, the same way Lance picks a provider from it.
Map<String, String> storageOptions = LanceStorageOptions.fromDorisAndVendedStorageOptions(datasetUri,
storageProperties, table.getStorageOptions());
return new LanceTableAccess(datasetUri, storageOptions);
}
private DescribeTableResponse describeTable(String dbName, String tableName) {
try {
List<String> tableId = buildTableId(dbName, tableName);
DescribeTableRequest request = new DescribeTableRequest().id(tableId).withTableUri(true)
.vendCredentials(LANCE_REST.equals(catalogType));
synchronized (namespaceLock) {
return namespace.describeTable(request);
}
} catch (DdlException e) {
throw new RuntimeException(e);
}
}
private List<String> buildNamespaceId(String dbName) throws DdlException {
List<String> relativeNamespace = LanceNamespaceName.dorisDatabaseNameToNamespace(
dbName, DATABASE_NAMESPACE_DELIMITER, rootDatabase);
return buildFullNamespace(relativeNamespace);
}
private List<String> buildTableId(String dbName, String tableName) throws DdlException {
List<String> tableId = buildNamespaceId(dbName);
tableId.add(tableName);
return tableId;
}
/**
* Prepends the configured parent namespace to a namespace relative to this catalog.
*
* <p>For example, if {@code parentNamespace} is {@code [company, analytics]} and
* {@code relativeNamespace} is {@code [sales, daily]}, this method returns
* {@code [company, analytics, sales, daily]}. The returned list is a new mutable list;
* neither input list is modified.
*/
private List<String> buildFullNamespace(List<String> relativeNamespace) {
List<String> result = new ArrayList<>(parentNamespace.size() + relativeNamespace.size());
result.addAll(parentNamespace);
result.addAll(relativeNamespace);
return result;
}
}