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/*
* Copyright (c) 2017-2018 Snowflake Computing Inc. All right reserved.
*/
package net.snowflake.client.jdbc.cloud.storage;
import net.snowflake.client.core.SFSession;
import net.snowflake.client.jdbc.FileBackedOutputStream;
import net.snowflake.client.jdbc.SnowflakeSQLException;
import java.io.File;
import java.io.InputStream;
import java.util.Map;
import net.snowflake.client.jdbc.MatDesc;
/**
* Interface for storage client provider implementations
*
* @author lgiakoumakis
*/
public interface SnowflakeStorageClient
{
/**
* @return Returns the Max number of retry attempts
*/
int getMaxRetries();
/**
* Returns the max exponent for multiplying backoff with the power of 2, the value
* of 4 will give us 16secs as the max number of time to sleep before retry
*
* @return Returns the exponent
*/
int getRetryBackoffMaxExponent();
/**
* @return Returns the min number of milliseconds to sleep before retry
*/
int getRetryBackoffMin();
/**
* @return Returns true if encryption is enabled
*/
boolean isEncrypting();
/**
* @return Returns the size of the encryption key
*/
int getEncryptionKeySize();
/** Re-creates the encapsulated storage client with a fresh access token
* @param stageCredentials a Map (as returned by GS) which contains the new credential properties
* @throws SnowflakeSQLException failure to renew the storage client
**/
void renew(Map stageCredentials) throws SnowflakeSQLException;
/**
* shuts down the client
*/
void shutdown();
/**
* For a set of remote storage objects under a remote location and a given prefix/path
* returns their properties wrapped in ObjectSummary objects
* @param remoteStorageLocation location, i.e. bucket for S3
* @param prefix the prefix to list
* @return a collection of storage summary objects
* @throws StorageProviderException cloud storage provider error
*/
StorageObjectSummaryCollection listObjects(String remoteStorageLocation, String prefix)
throws StorageProviderException;
/**
* Returns the metadata properties for a remote storage object
* @param remoteStorageLocation location, i.e. bucket for S3
* @param prefix the prefix/path of the object to retrieve
* @return storage metadata object
* @throws StorageProviderException cloud storage provider error
*/
StorageObjectMetadata getObjectMetadata(String remoteStorageLocation, String prefix)
throws StorageProviderException;
/**
* Download a file from remote storage.
* @param connection connection object
* @param command command to download file
* @param localLocation local file path
* @param destFileName destination file name
* @param parallelism number of threads for parallel downloading
* @param remoteStorageLocation remote storage location, i.e. bucket for S3
* @param stageFilePath stage file path
* @param stageRegion region name where the stage persists
* @throws SnowflakeSQLException download failure
**/
void download(SFSession connection, String command, String localLocation, String destFileName,
int parallelism, String remoteStorageLocation, String stageFilePath, String stageRegion)
throws SnowflakeSQLException;
/**
* Upload a file (-stream) to remote storage
* @param connection connection object
* @param command upload command
* @param parallelism number of threads do parallel uploading
* @param uploadFromStream true if upload source is stream
* @param remoteStorageLocation s3 bucket name
* @param srcFile source file if not uploading from a stream
* @param destFileName file name on remote storage after upload
* @param inputStream stream used for uploading if fileBackedOutputStream is null
* @param fileBackedOutputStream stream used for uploading if not null
* @param meta object meta data
* @param stageRegion region name where the stage persists
* @throws SnowflakeSQLException if upload failed even after retry
*/
void upload(SFSession connection, String command, int parallelism, boolean uploadFromStream,
String remoteStorageLocation, File srcFile, String destFileName, InputStream inputStream,
FileBackedOutputStream fileBackedOutputStream, StorageObjectMetadata meta, String stageRegion)
throws SnowflakeSQLException;
/**
* Handles exceptions thrown by the remote storage provider
* @param ex the exception to handle
* @param retryCount current number of retries, incremented by the caller before each call
* @param operation string that indicates the function/operation that was taking place,
* when the exception was raised, for example "upload"
* @param connection the current SFSession object used by the client
* @param command the command attempted at the time of the exception
* @throws SnowflakeSQLException exceptions that were not handled, or retried past
* what the retry policy allows, are propagated
*/
void handleStorageException(Exception ex, int retryCount, String operation, SFSession connection, String command)
throws SnowflakeSQLException;
/**
* Returns the material descriptor key
* @return the material descriptor key
*/
String getMatdescKey();
/**
* Adds encryption metadata to the StorageObjectMetadata object
* @param meta the storage metadata object to add the encyption info to
* @param matDesc the material decriptor
* @param ivData the initialization vector
* @param encKeK the key encryption key
* @param contentLength the length of the encrypted content
*/
void addEncryptionMetadata(StorageObjectMetadata meta, MatDesc matDesc, byte[] ivData, byte[] encKeK, long contentLength);
/**
* Adds digest metadata to the StorageObjectMetadata object
* @param meta the storage metadata object to add the digest to
* @param digest the digest metadata to add
*/
void addDigestMetadata(StorageObjectMetadata meta, String digest);
/**
* Gets digest metadata to the StorageObjectMetadata object
* @param meta the metadata object to extract the digest metadata from
* @return the digest metadata value
*/
String getDigestMetadata(StorageObjectMetadata meta);
}
