Metadata Import and Export

def list_metadata_imports(
    self,
    request: Optional[ListMetadataImportsRequest] = None,
    *,
    parent: Optional[str] = None,
    retry: OptionalRetry = gapic_v1.method.DEFAULT,
    timeout: Union[float, object] = gapic_v1.method.DEFAULT,
    metadata: Sequence[Tuple[str, str]] = ()
) -> pagers.ListMetadataImportsPager:
    """
    Lists imports in a service.

    Args:
        request: The request object containing list parameters
        parent: Required. The relative resource name of the service
                Format: projects/{project_id}/locations/{location_id}/services/{service_id}
        retry: Retry configuration for the request
        timeout: Request timeout in seconds
        metadata: Additional metadata for the request

    Returns:
        ListMetadataImportsPager: Pageable list of metadata imports

    Raises:
        google.api_core.exceptions.GoogleAPICallError: If the request fails
    """

from google.cloud import metastore

client = metastore.DataprocMetastoreClient()
parent = "projects/my-project/locations/us-central1/services/my-metastore"

# List all imports
for metadata_import in client.list_metadata_imports(parent=parent):
    print(f"Import: {metadata_import.name}")
    print(f"State: {metadata_import.state.name}")
    print(f"Database dump: {metadata_import.database_dump.gcs_uri}")

# Filter by state
request = metastore.ListMetadataImportsRequest(
    parent=parent,
    filter="state=SUCCEEDED",
    order_by="create_time desc"
)

def get_metadata_import(
    self,
    request: Optional[GetMetadataImportRequest] = None,
    *,
    name: Optional[str] = None,
    retry: OptionalRetry = gapic_v1.method.DEFAULT,
    timeout: Union[float, object] = gapic_v1.method.DEFAULT,
    metadata: Sequence[Tuple[str, str]] = ()
) -> MetadataImport:
    """
    Gets details of a single import.

    Args:
        request: The request object
        name: Required. The relative resource name of the metadata import
              Format: projects/{project_id}/locations/{location_id}/services/{service_id}/metadataImports/{import_id}
        retry: Retry configuration
        timeout: Request timeout in seconds
        metadata: Additional metadata

    Returns:
        MetadataImport: The metadata import resource

    Raises:
        google.api_core.exceptions.NotFound: If the import doesn't exist
    """

def create_metadata_import(
    self,
    request: Optional[CreateMetadataImportRequest] = None,
    *,
    parent: Optional[str] = None,
    metadata_import: Optional[MetadataImport] = None,
    metadata_import_id: Optional[str] = None,
    retry: OptionalRetry = gapic_v1.method.DEFAULT,
    timeout: Union[float, object] = gapic_v1.method.DEFAULT,
    metadata: Sequence[Tuple[str, str]] = ()
) -> operation.Operation:
    """
    Creates a new MetadataImport in a given project and location.

    Args:
        request: The request object
        parent: Required. The relative resource name of the service
        metadata_import: Required. The metadata import configuration
        metadata_import_id: Required. The ID to use for the import
        retry: Retry configuration
        timeout: Request timeout in seconds
        metadata: Additional metadata

    Returns:
        Operation: Long-running operation for metadata import

    Raises:
        google.api_core.exceptions.AlreadyExists: If import_id already exists
        google.api_core.exceptions.InvalidArgument: If configuration is invalid
    """

from google.cloud import metastore

client = metastore.DataprocMetastoreClient()

# Import from MySQL dump
import_config = metastore.MetadataImport(
    description="Import production MySQL metastore data",
    database_dump=metastore.MetadataImport.DatabaseDump(
        gcs_uri="gs://my-bucket/metastore-dumps/prod-metastore-20240115.sql",
        database_type=metastore.MetadataImport.DatabaseDump.DatabaseType.MYSQL
    )
)

operation = client.create_metadata_import(
    parent="projects/my-project/locations/us-central1/services/my-metastore",
    metadata_import_id="mysql-import-20240115",
    metadata_import=import_config
)

# Monitor import progress
print("Starting metadata import...")
result = operation.result(timeout=7200)  # Can take up to 2 hours for large dumps
print(f"Import completed: {result.name}")

def update_metadata_import(
    self,
    request: Optional[UpdateMetadataImportRequest] = None,
    *,
    metadata_import: Optional[MetadataImport] = None,
    update_mask: Optional[field_mask_pb2.FieldMask] = None,
    retry: OptionalRetry = gapic_v1.method.DEFAULT,
    timeout: Union[float, object] = gapic_v1.method.DEFAULT,
    metadata: Sequence[Tuple[str, str]] = ()
) -> operation.Operation:
    """
    Updates a single import.

    Args:
        request: The request object
        metadata_import: Required. The import to update
        update_mask: Required. Field mask specifying which fields to update
        retry: Retry configuration
        timeout: Request timeout in seconds
        metadata: Additional metadata

    Returns:
        Operation: Long-running operation for import update

    Raises:
        google.api_core.exceptions.NotFound: If the import doesn't exist
    """

def export_metadata(
    self,
    request: Optional[ExportMetadataRequest] = None,
    *,
    service: Optional[str] = None,
    retry: OptionalRetry = gapic_v1.method.DEFAULT,
    timeout: Union[float, object] = gapic_v1.method.DEFAULT,
    metadata: Sequence[Tuple[str, str]] = ()
) -> operation.Operation:
    """
    Exports metadata from a service.

    Args:
        request: The request object
        service: Required. The relative resource name of the service
        retry: Retry configuration
        timeout: Request timeout in seconds
        metadata: Additional metadata

    Returns:
        Operation: Long-running operation for metadata export

    Raises:
        google.api_core.exceptions.NotFound: If the service doesn't exist
        google.api_core.exceptions.FailedPrecondition: If export cannot be performed
    """

from google.cloud import metastore

client = metastore.DataprocMetastoreClient()

# Export to Cloud Storage
export_request = metastore.ExportMetadataRequest(
    service="projects/my-project/locations/us-central1/services/my-metastore",
    destination_gcs_uri="gs://my-exports/metastore-export-20240115/",
    database_dump_type=metastore.DatabaseDumpSpec.Type.MYSQL
)

operation = client.export_metadata(request=export_request)

# Wait for export completion
print("Starting metadata export...")
metadata_export = operation.result(timeout=3600)
print(f"Export completed to: {metadata_export.destination_gcs_uri}")

class MetadataImport:
    name: str
    description: str
    create_time: timestamp_pb2.Timestamp
    update_time: timestamp_pb2.Timestamp
    end_time: timestamp_pb2.Timestamp
    state: State
    database_dump: DatabaseDump

    class State(enum.Enum):
        STATE_UNSPECIFIED = 0
        RUNNING = 1
        SUCCEEDED = 2
        UPDATING = 3
        FAILED = 4

    class DatabaseDump:
        gcs_uri: str
        database_type: DatabaseType
        type: Optional[str]  # Deprecated

        class DatabaseType(enum.Enum):
            DATABASE_TYPE_UNSPECIFIED = 0
            MYSQL = 1
            POSTGRESQL = 2

class MetadataExport:
    destination_gcs_uri: str
    start_time: timestamp_pb2.Timestamp
    end_time: timestamp_pb2.Timestamp
    state: State
    database_dump_type: DatabaseDumpSpec.Type

    class State(enum.Enum):
        STATE_UNSPECIFIED = 0
        RUNNING = 1
        SUCCEEDED = 2
        FAILED = 3
        CANCELLED = 4

class DatabaseDumpSpec:
    gcs_uri: str
    type: Type

    class Type(enum.Enum):
        TYPE_UNSPECIFIED = 0
        MYSQL = 1
        POSTGRESQL = 2

class ListMetadataImportsRequest:
    parent: str
    page_size: int
    page_token: str
    filter: str
    order_by: str

class ListMetadataImportsResponse:
    metadata_imports: List[MetadataImport]
    next_page_token: str
    unreachable: List[str]

class GetMetadataImportRequest:
    name: str

class CreateMetadataImportRequest:
    parent: str
    metadata_import_id: str
    metadata_import: MetadataImport
    request_id: str

class UpdateMetadataImportRequest:
    update_mask: field_mask_pb2.FieldMask
    metadata_import: MetadataImport
    request_id: str

class ExportMetadataRequest:
    service: str
    destination_gcs_uri: str
    request_id: str
    database_dump_type: DatabaseDumpSpec.Type

from google.cloud import metastore, storage
import logging
from typing import List

class MetastoreMigrator:
    def __init__(self, project_id: str, location: str, service_id: str):
        self.metastore_client = metastore.DataprocMetastoreClient()
        self.storage_client = storage.Client()
        self.service_name = f"projects/{project_id}/locations/{location}/services/{service_id}"
    
    def import_from_multiple_dumps(self, dump_uris: List[str]) -> List[str]:
        """Import metadata from multiple database dumps."""
        import_operations = []
        
        for i, dump_uri in enumerate(dump_uris):
            import_config = metastore.MetadataImport(
                description=f"Batch import {i+1} of {len(dump_uris)}",
                database_dump=metastore.MetadataImport.DatabaseDump(
                    gcs_uri=dump_uri,
                    database_type=metastore.MetadataImport.DatabaseDump.DatabaseType.MYSQL
                )
            )
            
            operation = self.metastore_client.create_metadata_import(
                parent=self.service_name,
                metadata_import_id=f"batch-import-{i+1:03d}",
                metadata_import=import_config
            )
            
            import_operations.append(operation.name)
            logging.info(f"Started import {i+1}: {operation.name}")
        
        return import_operations
    
    def wait_for_imports(self, operation_names: List[str]):
        """Wait for all import operations to complete."""
        completed = 0
        total = len(operation_names)
        
        while completed < total:
            for op_name in operation_names:
                # Check operation status
                # Implementation would use operations client
                pass
            
            time.sleep(60)  # Check every minute
            logging.info(f"Import progress: {completed}/{total} completed")

def export_with_validation(service_name: str, export_bucket: str):
    """Export metadata with validation steps."""
    client = metastore.DataprocMetastoreClient()
    
    # Create timestamped export location
    export_timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    export_uri = f"gs://{export_bucket}/exports/{export_timestamp}/"
    
    # Start export
    export_request = metastore.ExportMetadataRequest(
        service=service_name,
        destination_gcs_uri=export_uri,
        database_dump_type=metastore.DatabaseDumpSpec.Type.MYSQL
    )
    
    operation = client.export_metadata(request=export_request)
    
    try:
        # Wait for export completion
        result = operation.result(timeout=3600)
        
        # Validate export files exist in Cloud Storage
        storage_client = storage.Client()
        bucket = storage_client.bucket(export_bucket)
        
        export_files = list(bucket.list_blobs(prefix=f"exports/{export_timestamp}/"))
        if not export_files:
            raise ValueError("Export completed but no files found in Cloud Storage")
        
        total_size = sum(blob.size for blob in export_files)
        logging.info(f"Export validated: {len(export_files)} files, {total_size} bytes")
        
        return export_uri
        
    except Exception as e:
        logging.error(f"Export failed or validation error: {e}")
        raise