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Java SDK for Microsoft Azure Data Lake Store
/*
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
* See License.txt in the project root for license information.
*/
package com.microsoft.azure.datalake.store;
import com.microsoft.azure.datalake.store.acl.AclEntry;
import com.microsoft.azure.datalake.store.acl.AclStatus;
import com.microsoft.azure.datalake.store.oauth2.*;
import com.microsoft.azure.datalake.store.retrypolicies.ExponentialBackoffPolicy;
import com.microsoft.azure.datalake.store.retrypolicies.NonIdempotentRetryPolicy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Constructor;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.*;
import java.util.concurrent.atomic.AtomicLong;
/**
* {@code ADLStoreClient} class represents a client to Azure Data Lake. It can be used to perform operations on files
* and directories.
*
*/
public class ADLStoreClient {
private final String accountFQDN;
private String accessToken;
private final AccessTokenProvider tokenProvider;
private static final Logger log = LoggerFactory.getLogger("com.microsoft.azure.datalake.store"); // package-default logging policy
private static final AtomicLong clientIdCounter = new AtomicLong(0);
private final long clientId;
private String userAgentString;
private String tiHeader = null;
private String proto = "https";
private boolean enableRemoteExceptions = false;
private String pathPrefix = null;
private int readAheadQueueDepth = -1; // no preference set by caller, use default in ADLFileInputStream
volatile boolean disableReadAheads = false;
int timeout = 60000; // internal scope, available to Input and Output Streams
private static String sdkVersion = null;
static {
InputStream is = ADLStoreClient.class.getResourceAsStream("/adlsdkversion.properties");
if (is == null) {
sdkVersion = "SDKVersionNotKnown";
} else {
Properties prop = new Properties();
try {
prop.load(is);
} catch (IOException ex) {
sdkVersion = "SDKVersionUnknown";
}
try {
is.close();
} catch (IOException ex) {
// swallow
}
if (sdkVersion == null) sdkVersion = prop.getProperty("sdkversion", "SDKVersionMissing");
}
// This stinks to set this system-wide property from within SDK. However, Oracle JDK has a flaw in that
// HttpURLConnection automatically and silently retries POST requests, which is clearly against HTTP semantics.
// See details here:
// http://koenserneels.blogspot.com/2016/01/pola-and-httpurlconnection.html
// http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6382788
System.setProperty("sun.net.http.retryPost", "false");
}
private static String userAgent =
String.format("%s-%s/%s-%s/%s/%s-%s",
"ADLSJavaSDK",
sdkVersion,
System.getProperty("os.name").replaceAll(" ", ""),
System.getProperty("os.version"),
System.getProperty("os.arch"),
System.getProperty("java.vendor").replaceAll(" ", ""),
System.getProperty("java.version")
);
// private constructor, references should be obtained using the createClient factory method
private ADLStoreClient(String accountFQDN, String accessToken, long clientId, AccessTokenProvider tokenProvider) {
this.accountFQDN = accountFQDN;
this.accessToken = "Bearer " + accessToken;
this.tokenProvider = tokenProvider;
this.clientId = clientId;
this.userAgentString = userAgent;
}
/**
* gets an {@code ADLStoreClient} object.
*
* @param accountFQDN string containing the fully qualified domain name of the account.
* e.g., contoso.azuredatalakestore.net
* @param token {@link AzureADToken} object that contains the AAD token to use
* @return the client object
*/
public static ADLStoreClient createClient(String accountFQDN, AzureADToken token) {
if (accountFQDN == null || accountFQDN.trim().equals("")) {
throw new IllegalArgumentException("account name is required");
}
if (token == null || token.accessToken == null || token.accessToken.equals("")) {
throw new IllegalArgumentException("token is required");
}
long clientId = clientIdCounter.incrementAndGet();
log.trace("ADLStoreClient {} created for {} using SDK version {}", clientId, accountFQDN, sdkVersion);
return new ADLStoreClient(accountFQDN, token.accessToken, clientId, null);
}
/**
* gets an {@code ADLStoreClient} object.
*
* @param accountFQDN string containing the fully qualified domain name of the account.
* e.g., contoso.azuredatalakestore.net
* @param accessToken String containing the AAD access token to be used
* @return the client object
*/
public static ADLStoreClient createClient(String accountFQDN, String accessToken) {
if (accountFQDN == null || accountFQDN.trim().equals("")) {
throw new IllegalArgumentException("account name is required");
}
if (accessToken == null || accessToken.equals("")) {
throw new IllegalArgumentException("token is required");
}
long clientId = clientIdCounter.incrementAndGet();
log.trace("ADLStoreClient {} created for {} using SDK version {}", clientId, accountFQDN, sdkVersion);
return new ADLStoreClient(accountFQDN, accessToken, clientId, null);
}
/**
* gets an {@code ADLStoreClient} object.
*
* @param accountFQDN string containing the fully qualified domain name of the account.
* For example, contoso.azuredatalakestore.net
* @param tokenProvider {@link AccessTokenProvider} that can provide the AAD token
* @return the client object
*/
public static ADLStoreClient createClient(String accountFQDN, AccessTokenProvider tokenProvider) {
if (accountFQDN == null || accountFQDN.trim().equals("")) {
throw new IllegalArgumentException("account name is required");
}
if (tokenProvider == null) {
throw new IllegalArgumentException("token provider is required");
}
long clientId = clientIdCounter.incrementAndGet();
log.trace("ADLStoreClient {} created for {} using SDK version {}", clientId, accountFQDN, sdkVersion);
return new ADLStoreClient(accountFQDN, null, clientId, tokenProvider);
}
/**
* gets an {@code ADLStoreClient} object.
*
* @param accountFQDN string containing the fully qualified domain name of the account.
* For example, contoso.azuredatalakestore.net
* @param tokenProvider {@link ClientCredsTokenProvider} that can provide the AAD token
* @return the client object
*/
public static ADLStoreClient createClient(String accountFQDN, ClientCredsTokenProvider tokenProvider) {
// just a convenience overload, for easy discoverability in IDE's autocompletion.
return createClient(accountFQDN, (AccessTokenProvider) tokenProvider);
}
/**
* gets an {@code ADLStoreClient} object.
*
* @param accountFQDN string containing the fully qualified domain name of the account.
* For example, contoso.azuredatalakestore.net
* @param tokenProvider {@link RefreshTokenBasedTokenProvider} that can provide the AAD token
* @return the client object
*/
public static ADLStoreClient createClient(String accountFQDN, RefreshTokenBasedTokenProvider tokenProvider) {
// just a convenience overload, for easy discoverability in IDE's autocompletion.
return createClient(accountFQDN, (AccessTokenProvider) tokenProvider); }
/**
* gets an {@code ADLStoreClient} object.
*
* @param accountFQDN string containing the fully qualified domain name of the account.
* For example, contoso.azuredatalakestore.net
* @param tokenProvider {@link UserPasswordTokenProvider} that can provide the AAD token
* @return the client object
*/
public static ADLStoreClient createClient(String accountFQDN, UserPasswordTokenProvider tokenProvider) {
// just a convenience overload, for easy discoverability in IDE's autocompletion.
return createClient(accountFQDN, (AccessTokenProvider) tokenProvider); }
/**
* gets an {@code ADLStoreClient} object.
*
* @param accountFQDN string containing the fully qualified domain name of the account.
* For example, contoso.azuredatalakestore.net
* @param tokenProvider {@link DeviceCodeTokenProvider} that can provide the AAD token
* @return the client object
*/
public static ADLStoreClient createClient(String accountFQDN, DeviceCodeTokenProvider tokenProvider) {
// just a convenience overload, for easy discoverability in IDE's autocompletion.
return createClient(accountFQDN, (AccessTokenProvider) tokenProvider); }
/**
* gets an {@code ADLStoreClient} object.
*
* @param accountFQDN string containing the fully qualified domain name of the account.
* For example, contoso.azuredatalakestore.net
* @param tokenProvider {@link DeviceCodeTokenProvider} that can provide the AAD token
* @return the client object
*/
public static ADLStoreClient createClient(String accountFQDN, MsiTokenProvider tokenProvider) {
// just a convenience overload, for easy discoverability in IDE's autocompletion.
return createClient(accountFQDN, (AccessTokenProvider) tokenProvider); }
/* ----------------------------------------------------------------------------------------------------------*/
/*
*
* Methods that apply to Files only
*
*/
/**
* create a file. If {@code overwriteIfExists} is false and the file already exists,
* then an exceptionis thrown.
* The call returns an {@link ADLFileOutputStream} that can then be written to.
*
*
* @param path full pathname of file to create
* @param mode {@link IfExists} {@code enum} specifying whether to overwite or throw
* an exception if the file already exists
* @return {@link ADLFileOutputStream} to write to
* @throws IOException {@link ADLException} is thrown if there is an error in creating the file
*/
public ADLFileOutputStream createFile(String path, IfExists mode) throws IOException {
return createFile(path, mode, null, true);
}
/**
* create a file. If {@code overwriteIfExists} is false and the file already exists,
* then an exceptionis thrown.
* The call returns an {@link ADLFileOutputStream} that can then be written to.
*
*
* @param path full pathname of file to create
* @param mode {@link IfExists} {@code enum} specifying whether to overwite or throw
* an exception if the file already exists
* @param octalPermission permissions for the file, as octal digits (For Example, {@code "755"})
* @param createParent if true, then parent directories of the file are created if they are missing.
* @return {@link ADLFileOutputStream} to write to
* @throws IOException {@link ADLException} is thrown if there is an error in creating the file
*/
public ADLFileOutputStream createFile(String path, IfExists mode, String octalPermission, boolean createParent) throws IOException {
if (octalPermission != null && !octalPermission.equals("") && !Core.isValidOctal(octalPermission)) {
throw new IllegalArgumentException("Invalid directory permissions specified: " + octalPermission);
}
if (log.isTraceEnabled()) {
log.trace("create file for client {} for file {}", this.getClientId(), path);
}
String leaseId = UUID.randomUUID().toString();
boolean overwrite = (mode==IfExists.OVERWRITE);
RequestOptions opts = new RequestOptions();
opts.retryPolicy = overwrite ? new ExponentialBackoffPolicy() : new NonIdempotentRetryPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.create(path, overwrite, octalPermission, null, 0, 0, leaseId,
leaseId, createParent, SyncFlag.DATA, this, opts, resp);
if (!resp.successful) {
throw this.getExceptionFromResponse(resp, "Error creating file " + path);
}
return new ADLFileOutputStream(path, this, true, leaseId);
}
/**
* Opens a file for read and returns an {@link ADLFileInputStream} to read the file
* contents from.
*
* @param path full pathname of file to read
* @return {@link ADLFileInputStream} to read the file contents from.
* @throws IOException {@link ADLException} is thrown if there is an error in opening the file
*/
public ADLFileInputStream getReadStream(String path) throws IOException {
DirectoryEntry de = getDirectoryEntry(path);
if (de.type == DirectoryEntryType.FILE) {
return new ADLFileInputStream(path, de, this);
} else {
throw new ADLException("Path is not a file: " + path);
}
}
/**
* appends to an existing file.
*
* @param path full pathname of file to append to
* @return {@link ADLFileOutputStream} to write to. The contents written to this stream
* will be appended to the file.
* @throws IOException {@link ADLException} is thrown if there is an error in opening the file for append
*/
public ADLFileOutputStream getAppendStream(String path) throws IOException {
String leaseId = UUID.randomUUID().toString();
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.append(path, -1, null, 0, 0, leaseId, leaseId, SyncFlag.DATA, this, opts,
resp);
if (!resp.successful) {
throw this.getExceptionFromResponse(resp, "Error appending to file " + path);
}
return new ADLFileOutputStream(path, this, false, leaseId);
}
/**
* Concatenate the specified list of files into this file. The target should not exist.
* The source files will be deleted if the concatenate succeeds.
*
*
* @param path full pathname of the destination to concatenate files into
* @param fileList {@link List} of strings containing full pathnames of the files to concatenate.
* Cannot be null or empty.
* @return returns true if the call succeeds
* @throws IOException {@link ADLException} is thrown if there is an error in concatenating files
*/
public boolean concatenateFiles(String path, List fileList) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout + (fileList.size() * 500); // timeout proportional to number of files
OperationResponse resp = new OperationResponse();
Core.concat(path, fileList, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error concatenating files into " + path);
}
return true;
}
/**
* Sets the expiry time on a file.
*
* @param path path of the file to set expiry on
* @param expiryOption {@link ExpiryOption} value specifying how to interpret the passed in time
* @param expiryTimeMilliseconds time duration in milliseconds
* @throws IOException if there is an error in setting file expiry
*/
public void setExpiryTime(String path, ExpiryOption expiryOption, long expiryTimeMilliseconds) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.setExpiryTime(path, expiryOption, expiryTimeMilliseconds, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error concatenating files into " + path);
}
}
/*
*
* Methods that apply to Directories only
*
*/
/**
* Enumerates the contents of a directory, returning a {@link List} of {@link DirectoryEntry} objects,
* one per file or directory in the specified directory.
*
* @param path full pathname of directory to enumerate
* @return {@link List}<{@link DirectoryEntry}> containing the contents of the directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public List enumerateDirectory(String path) throws IOException {
return enumerateDirectory(path, (UserGroupRepresentation) null);
}
/**
* Enumerates the contents of a directory, returning a {@link List} of {@link DirectoryEntry} objects,
* one per file or directory in the specified directory.
*
* @param path full pathname of directory to enumerate
* @param oidOrUpn {@link UserGroupRepresentation} enum specifying whether to return user and group information as
* OID or UPN
* @return {@link List}<{@link DirectoryEntry}> containing the contents of the directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public List enumerateDirectory(String path, UserGroupRepresentation oidOrUpn) throws IOException {
return enumerateDirectory(path, Integer.MAX_VALUE, null, null, oidOrUpn);
}
/**
* Enumerates the contents of a directory, returning a {@link List} of {@link DirectoryEntry} objects,
* one per file or directory in the specified directory.
*
* To avoid overwhelming the client or the server, the call may return a partial list, in which case
* the caller should make the call again with the last entry from the returned list specified as the
* {@code startAfter} parameter of the next call.
*
* @param path full pathname of directory to enumerate
* @param maxEntriesToRetrieve maximum number of entries to retrieve. Note that server can limit the
* number of entries retrieved to a number smaller than the number specified.
* @return {@link List}<{@link DirectoryEntry}> containing the contents of the directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public List enumerateDirectory(String path, int maxEntriesToRetrieve) throws IOException {
return enumerateDirectory(path, maxEntriesToRetrieve, null, null);
}
/**
* Enumerates the contents of a directory, returning a {@link List} of {@link DirectoryEntry} objects,
* one per file or directory in the specified directory.
*
* To avoid overwhelming the client or the server, the call may return a partial list, in which case
* the caller should make the call again with the last entry from the returned list specified as the
* {@code startAfter} parameter of the next call.
*
*
* @param path full pathname of directory to enumerate
* @param startAfter the filename after which to begin enumeration
* @return {@link List}<{@link DirectoryEntry}> containing the contents of the directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public List enumerateDirectory(String path, String startAfter) throws IOException {
return enumerateDirectory(path, Integer.MAX_VALUE, startAfter, null);
}
/**
* Enumerates the contents of a directory, returning a {@link List} of {@link DirectoryEntry} objects,
* one per file or directory in the specified directory.
*
* To avoid overwhelming the client or the server, the call may return a partial list, in which case
* the caller should make the call again with the last entry from the returned list specified as the
* {@code startAfter} parameter of the next call.
*
*
* @param path full pathname of directory to enumerate
* @param maxEntriesToRetrieve maximum number of entries to retrieve. Note that server can limit the
* number of entries retrieved to a number smaller than the number specified.
* @param startAfter the filename after which to begin enumeration
* @return {@link List}<{@link DirectoryEntry}> containing the contents of the directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public List enumerateDirectory(String path, int maxEntriesToRetrieve, String startAfter) throws IOException {
return enumerateDirectory(path, maxEntriesToRetrieve, startAfter, null);
}
/**
* Enumerates the contents of a directory, returning a {@link List} of {@link DirectoryEntry} objects,
* one per file or directory in the specified directory.
*
* To avoid overwhelming the client or the server, the call may return a partial list, in which case
* the caller should make the call again with the last entry from the returned list specified as the
* {@code startAfter} parameter of the next call.
*
*
* @param path full pathname of directory to enumerate
* @param startAfter the filename after which to begin enumeration
* @param endBefore the filename before which to end the enumeration
* @return {@link List}<{@link DirectoryEntry}> containing the contents of the directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public List enumerateDirectory(String path, String startAfter, String endBefore) throws IOException {
return enumerateDirectory(path, Integer.MAX_VALUE, startAfter, endBefore);
}
/**
* Enumerates the contents of a directory, returning a {@link List} of {@link DirectoryEntry} objects,
* one per file or directory in the specified directory.
*
* To avoid overwhelming the client or the server, the call may return a partial list, in which case
* the caller should make the call again with the last entry from the returned list specified as the
* {@code startAfter} parameter of the next call.
*
*
* @param path full pathname of directory to enumerate
* @param maxEntriesToRetrieve maximum number of entries to retrieve. Note that server can limit the
* number of entries retrieved to a number smaller than the number specified.
* @param startAfter the filename after which to begin enumeration
* @param endBefore the filename before which to end the enumeration
* @return {@link List}<{@link DirectoryEntry}> containing the contents of the directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public List enumerateDirectory(String path,
int maxEntriesToRetrieve,
String startAfter,
String endBefore)
throws IOException {
return enumerateDirectory(path, maxEntriesToRetrieve, startAfter, endBefore, null);
}
/**
* Enumerates the contents of a directory, returning a {@link List} of {@link DirectoryEntry} objects,
* one per file or directory in the specified directory.
*
* To avoid overwhelming the client or the server, the call may return a partial list, in which case
* the caller should make the call again with the last entry from the returned list specified as the
* {@code startAfter} parameter of the next call.
*
*
* @param path full pathname of directory to enumerate
* @param maxEntriesToRetrieve maximum number of entries to retrieve. Note that server can limit the
* number of entries retrieved to a number smaller than the number specified.
* @param startAfter the filename after which to begin enumeration
* @param endBefore the filename before which to end the enumeration
* @param oidOrUpn {@link UserGroupRepresentation} enum specifying whether to return user and group information as
* OID or UPN
* @return {@link List}<{@link DirectoryEntry}> containing the contents of the directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public List enumerateDirectory(String path,
int maxEntriesToRetrieve,
String startAfter,
String endBefore,
UserGroupRepresentation oidOrUpn)
throws IOException {
ArrayList deList = new ArrayList();
int pagesize = 4000;
int numEntriesToRequest;
ArrayList list;
boolean eol = (maxEntriesToRetrieve <= 0); // eol=end-of-list
while (!eol) {
numEntriesToRequest = Math.min(maxEntriesToRetrieve, pagesize);
list = (ArrayList) enumerateDirectoryInternal(path, numEntriesToRequest,
startAfter, endBefore, oidOrUpn);
if (list == null || list.size() == 0) break; // return what we have so far
int size = list.size();
deList.addAll(list);
startAfter = list.get(size-1).name;
maxEntriesToRetrieve -= size;
eol = (maxEntriesToRetrieve <= 0) || (size < numEntriesToRequest);
}
return deList;
}
private List enumerateDirectoryInternal(String path,
int maxEntriesToRetrieve,
String startAfter,
String endBefore,
UserGroupRepresentation oidOrUpn)
throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = 2 * this.timeout; // double the default timeout
OperationResponse resp = new OperationResponse();
List dirEnt = Core.listStatus(path, startAfter, endBefore, maxEntriesToRetrieve, oidOrUpn, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error enumerating directory " + path);
}
return dirEnt;
}
/**
* creates a directory, and all it's parent directories if they dont already exist.
*
* @param path full pathname of directory to create
* @return returns {@code true} if the call succeeded
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public boolean createDirectory(String path) throws IOException {
return createDirectory(path, null);
}
/**
* creates a directory, and all it's parent directories if they dont already exist.
*
* @param path full pathname of directory to create
* @param octalPermission permissions for the directory, as octal digits (for example, {@code "755"}). Can be null.
* @return returns {@code true} if the call succeeded
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public boolean createDirectory(String path, String octalPermission) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
boolean succeeded = Core.mkdirs(path, octalPermission, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error creating directory " + path);
}
return succeeded;
}
/**
* deletes a directory and all it's child directories and files recursively.
*
* @param path full pathname of directory to delete
* @return returns {@code true} if the call succeeded
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public boolean deleteRecursive(String path) throws IOException {
if (path.equals("/")) throw new IllegalArgumentException("Cannot delete root directory tree");
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
boolean succeeded = Core.delete(path, true, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error deleting directory tree " + path);
}
return succeeded;
}
/**
* removes all default acl entries from a directory. The access ACLs for the directory itself are
* not modified.
*
* @param path full pathname of directory to remove default ACLs from
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public void removeDefaultAcls(String path) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.removeDefaultAcl(path, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error removing default ACLs for directory " + path);
}
}
/*
*
* Methods that apply to both Files and Directoties
*
*/
/**
* rename a file or directory.
*
* @param path full pathname of file or directory to rename
* @param newName the new name of the file
*
* @return returns {@code true} if the call succeeded
*
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public boolean rename(String path, String newName) throws IOException {
return rename(path, newName, false);
}
/**
* rename a file or directory.
*
* @param path full pathname of file or directory to rename
* @param newName the new name of the file/directory
* @param overwrite overwrite destination if it already exists. If the
* destination is a non-empty directory, then the call
* fails rather than overwrite the directory.
*
* @return returns {@code true} if the call succeeded
*
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public boolean rename(String path, String newName, boolean overwrite) throws IOException {
if (path==null || path.equals("")) throw new IllegalArgumentException("Path cannot be null or empty");
if (path.equals("/")) throw new IllegalArgumentException("Cannot rename root directory");
// In case of self rename operation, HDFS semantics expects true if file, false if directory.
// Renaming self is not a common operation. but more obvious to contract test validation.
if(path.equals(newName)) {
return getDirectoryEntry(path).type == DirectoryEntryType.FILE;
}
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
boolean succeeded = Core.rename(path, newName, overwrite, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error renaming file " + path);
}
return succeeded;
}
/**
* delete the file or directory.
*
* @param path full pathname of file or directory to delete
* @return returns {@code true} if the call succeeded
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public boolean delete(String path) throws IOException {
if (path.equals("/")) throw new IllegalArgumentException("Cannot delete root directory");
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
boolean succeeded = Core.delete(path, false, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error deleting directory " + path);
}
return succeeded;
}
/**
* Gets the directory metadata about this file or directory.
*
* @param path full pathname of file or directory to get directory entry for
* @return {@link DirectoryEntry} containing the metadata for the file/directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public DirectoryEntry getDirectoryEntry(String path) throws IOException {
return getDirectoryEntry(path, null);
}
/**
* Gets the directory metadata about this file or directory.
*
* @param path full pathname of file or directory to get directory entry for
* @param oidOrUpn {@link UserGroupRepresentation} enum specifying whether to return user and group information as
* OID or UPN
* @return {@link DirectoryEntry} containing the metadata for the file/directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public DirectoryEntry getDirectoryEntry(String path, UserGroupRepresentation oidOrUpn) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
DirectoryEntry dirEnt = Core.getFileStatus(path, oidOrUpn, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error getting info for file " + path);
}
return dirEnt;
}
/**
* Gets the content summary of a file or directory.
* @param path full pathname of file or directory to query
* @return {@link ContentSummary} containing summary of information about the file or directory
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public ContentSummary getContentSummary(String path) throws IOException {
return (new ContentSummaryProcessor()).getContentSummary(this, path);
}
/**
* sets the owning user and group of the file. If the user or group are {@code null}, then they are not changed.
* It is illegal to pass both user and owner as {@code null}.
*
* @param path full pathname of file or directory to set owner/group for
* @param owner the ID of the user, or {@code null}
* @param group the ID of the group, or {@code null}
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public void setOwner(String path, String owner, String group) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.setOwner(path, owner, group, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error setting owner for file " + path);
}
}
/**
* sets one or both of the times (Modified and Access time) of the file or directory
*
* @param path full pathname of file or directory to set times for
* @param atime Access time as a long
* @param mtime Modified time as a long
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public void setTimes(String path, Date atime, Date mtime) throws IOException {
long atimeLong = (atime == null)? -1 : atime.getTime();
long mtimeLong = (mtime == null)? -1 : mtime.getTime();
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.setTimes(path, atimeLong, mtimeLong, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error setting times for file " + path);
}
}
/**
* Check that a file or directory exists.
*
* @param filename path to check
* @return true if the path exists, false otherwise
* @throws IOException thrown on error
*/
public boolean checkExists(String filename) throws IOException {
if (filename == null || filename.trim().equals(""))
throw new IllegalArgumentException("filename cannot be null");
try {
getDirectoryEntry(filename);
} catch (ADLException ex) {
if (ex.httpResponseCode == 404) return false;
else throw ex;
}
return true;
}
/**
* Creates an empty file.
*
* @param filename name of file to create.
* @throws IOException thrown on error
*/
public void createEmptyFile(String filename) throws IOException {
if (filename == null || filename.trim().equals(""))
throw new IllegalArgumentException("filename cannot be null");
OutputStream out = createFile(filename, IfExists.FAIL);
out.close();
}
/**
* Sets the permissions of the specified file ro directory. This sets the traditional unix read/write/execute
* permissions for the file/directory. To set Acl's use the
* {@link #setAcl(String, List) setAcl} call.
*
* @param path full pathname of file or directory to set permissions for
* @param octalPermissions the permissions to set, in unix octal form. For example, '644'.
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public void setPermission(String path, String octalPermissions) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.setPermission(path, octalPermissions, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error setting times for " + path);
}
}
/**
* checks whether the calling user has the required permissions for the file/directory . The permissions
* to check should be specified in the rwx parameter, as a unix permission string
* (for example, {@code "r-x"}).
*
* @param path full pathname of file or directory to check access for
* @param rwx the permission to check for, in rwx string form. The call returns true if the caller has
* all the requested permissions. For example, specifying {@code "r-x"} succeeds if the caller has
* read and execute permissions.
* @return true if the caller has the requested permissions, false otherwise
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public boolean checkAccess(String path, String rwx) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.checkAccess(path, rwx, this, opts, resp);
if (!resp.successful) {
if (resp.httpResponseCode == 401 || resp.httpResponseCode == 403) return false;
throw getExceptionFromResponse(resp, "Error checking access for " + path);
}
return true;
}
/**
* Modify the acl entries for a file or directory. This call merges the supplied list with
* existing ACLs. If an entry with the same scope, type and user already exists, then the permissions
* are replaced. If not, than an new ACL entry if added.
*
* @param path full pathname of file or directory to change ACLs for
* @param aclSpec {@link List} of {@link AclEntry}s, containing the entries to add or modify
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public void modifyAclEntries(String path, List aclSpec) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.modifyAclEntries(path, aclSpec, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error modifying ACLs for " + path);
}
}
/**
* Sets the ACLs for a file or directory. If the file or directory already has any ACLs
* associated with it, then all the existing ACLs are removed before adding the specified
* ACLs.
*
* @param path full pathname of file or directory to set ACLs for
* @param aclSpec {@link List} of {@link AclEntry}s, containing the entries to set
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public void setAcl(String path, List aclSpec) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.setAcl(path, aclSpec, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error setting ACLs for " + path);
}
}
/**
* Removes the specified ACL entries from a file or directory.
*
* @param path full pathname of file or directory to remove ACLs for
* @param aclSpec {@link List} of {@link AclEntry}s to remove
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public void removeAclEntries(String path, List aclSpec) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.removeAclEntries(path, aclSpec, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error removing ACLs for " + path);
}
}
/**
* Removes all acl entries from a file or directory.
*
* @param path full pathname of file or directory to remove ACLs for
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public void removeAllAcls(String path) throws IOException {
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
Core.removeAcl(path, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error removing all ACLs for file " + path);
}
}
/**
* Queries the ACLs and permissions for a file or directory.
*
* @param path full pathname of file or directory to query
* @return {@link AclStatus} object containing the ACL and permission info
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public AclStatus getAclStatus(String path)
throws IOException {
return getAclStatus(path, null);
}
/**
* Queries the ACLs and permissions for a file or directory.
*
* @param path full pathname of file or directory to query
* @param oidOrUpn {@link UserGroupRepresentation} enum specifying whether to return user and group information as
* OID or UPN
* @return {@link AclStatus} object containing the ACL and permission info
* @throws IOException {@link ADLException} is thrown if there is an error
*/
public AclStatus getAclStatus(String path, UserGroupRepresentation oidOrUpn)
throws IOException {
AclStatus status = null;
RequestOptions opts = new RequestOptions();
opts.retryPolicy = new ExponentialBackoffPolicy();
opts.timeout = this.timeout;
OperationResponse resp = new OperationResponse();
status = Core.getAclStatus(path, oidOrUpn, this, opts, resp);
if (!resp.successful) {
throw getExceptionFromResponse(resp, "Error getting ACL Status for " + path);
}
return status;
}
/* ----------------------------------------------------------------------------------------------------------*/
/* Methods to set client's behavior */
/* ----------------------------------------------------------------------------------------------------------*/
/**
* Sets the options to configure the behavior of this client.
* @param o {@link ADLStoreOptions} object that specifies the options to set
* @throws IOException if there is an error in creating the file path prefix specified
*/
public synchronized void setOptions(ADLStoreOptions o) throws IOException {
if (o.getFilePathPrefix() != null) this.setFilePathPrefix(o.getFilePathPrefix());
if (o.isUsingInsecureTransport()) this.setInsecureTransport();
if (o.isThrowingRemoteExceptionsEnabled()) this.enableThrowingRemoteExceptions();
if (o.getUserAgentSuffix() != null) this.setUserAgentSuffix(o.getUserAgentSuffix());
if (o.getReadAheadQueueDepth() >= 0 ) this.readAheadQueueDepth = o.getReadAheadQueueDepth();
if (o.getDefaultTimeout() > 0) this.timeout = o.getDefaultTimeout();
}
/**
* update token on existing client.
* This is useful if the client is expected to be used over long time, and token has expired.
*
* @param token The OAuth2 Token
*/
public synchronized void updateToken(AzureADToken token) {
log.trace("AAD Token Updated for client client {} for account {}", clientId, accountFQDN);
this.accessToken = "Bearer " + token.accessToken;
}
/**
* update token on existing client.
* This is useful if the client is expected to be used over long time, and token has expired.
*
* @param accessToken The AAD Token string
*/
public synchronized void updateToken(String accessToken) {
log.trace("AAD Token Updated for client client {} for account {}", clientId, accountFQDN);
this.accessToken = "Bearer " + accessToken;
}
/* ----------------------------------------------------------------------------------------------------------*/
/* Private and internal methods */
/* ----------------------------------------------------------------------------------------------------------*/
/**
* Gets the Queue depth used for read-aheads in {@link ADLFileInputStream}
* @return the queue depth
*/
synchronized int getReadAheadQueueDepth() {
return this.readAheadQueueDepth;
}
/**
* gets the AAD access token associated with this client
* @return String containing the AAD Access token
* @throws IOException thrown if a token provider is being used and the token provider has problem getting token
*/
synchronized String getAccessToken() throws IOException {
if (tokenProvider != null ) {
return "Bearer " + tokenProvider.getToken().accessToken;
} else {
return accessToken;
}
}
/**
* gets the Azure Data Lake Store account name associated with this client
* @return the account name
*/
String getAccountName() {
return accountFQDN;
}
private synchronized void setUserAgentSuffix(String userAgentSuffix) {
if (userAgentSuffix != null && !userAgentSuffix.trim().equals("")) {
this.userAgentString = userAgent + "/" + userAgentSuffix;
log.trace("ADLStoreClient {} created for {} changed User-Agent to {}", clientId, accountFQDN, userAgentString);
if (userAgentSuffix.startsWith("hadoop-azure-datalake")) {
int pos = userAgentSuffix.indexOf('/');
if (pos > 0 && pos < (userAgentSuffix.length() - 1)) {
tiHeader = userAgentSuffix.substring(pos+1);
} else {
tiHeader = null;
}
} else {
tiHeader = null;
}
}
}
synchronized String getTiHeaderValue() {
return tiHeader;
}
/**
* Gets the HTTP User-Agent string that will be used for requests made from this client.
* @return User-Agent string
*/
synchronized String getUserAgent() {
return userAgentString;
}
private synchronized void setInsecureTransport() {
proto = "http";
}
/**
* get the http prefix ({@code http} or {@code https}) that will be used for
* connections used by thei client.
* @return Sytring containing the HTTP protocol used ({@code http} or {@code https})
*/
synchronized String getHttpPrefix() {
return proto;
}
/**
* Gets a unique long associated with this instance of {@code ADLStoreClient}
*
* @return a unique long associated with this instance of {@code ADLStoreClient}
*/
long getClientId() {
return this.clientId;
}
private synchronized void enableThrowingRemoteExceptions() {
enableRemoteExceptions = true;
}
synchronized boolean remoteExceptionsEnabled() {
return enableRemoteExceptions;
}
private synchronized void setFilePathPrefix(String prefix) throws IOException {
if (prefix==null || prefix.equals("")) throw new IllegalArgumentException("prefix cannot be empty or null");
if (prefix.equals("/")) return; // no prefix
if (prefix.contains("//")) throw new IllegalArgumentException("prefix cannot contain empty path element " + prefix);
if (prefix.charAt(0) != '/') prefix = "/" + prefix;
if (prefix.charAt(prefix.length()-1) == '/') prefix = prefix.substring(0, prefix.length()-1);
try {
pathPrefix = (new URI(null, null, prefix, null)).toASCIIString();
} catch (URISyntaxException ex) {
throw new IllegalArgumentException("Invalid path prefix: " + prefix);
}
}
/**
* Gets the file path prefix used for this client.
*
* @return the path prefix (URL encoded)
*/
synchronized String getFilePathPrefix() {
return pathPrefix;
}
/* ----------------------------------------------------------------------------------------------------------*/
/* Utility methods */
/* ----------------------------------------------------------------------------------------------------------*/
/**
* creates an {@link ADLException} from {@link OperationResponse}.
*
* @param resp the {@link OperationResponse} to convert to exception
* @param defaultMessage message to use if the inner exception does not have a text message.
* @return the {@link ADLException}, or {@code null} if the {@code resp.successful} is {@code true}
*/
public IOException getExceptionFromResponse(OperationResponse resp, String defaultMessage) {
String messageSuffix = " [ServerRequestId:" + resp.requestId + "]";
if (remoteExceptionsEnabled() &&
resp.remoteExceptionJavaClassName !=null &&
!resp.remoteExceptionJavaClassName.equals("")) {
return getRemoteException(resp.remoteExceptionJavaClassName, resp.remoteExceptionMessage + messageSuffix);
} else {
String msg = resp.message == null ? defaultMessage : defaultMessage + "\n" + resp.message;
if (resp.ex != null) {
msg = msg + "\nOperation " + resp.opCode + " failed with exception " + resp.ex.getClass().getName() + " : " + resp.ex.getMessage();
} else if (resp.httpResponseCode > 0) {
msg = msg + "\nOperation " + resp.opCode + " failed with HTTP" + resp.httpResponseCode + " : " + resp.remoteExceptionName;
}
msg = msg +
"\nLast encountered exception thrown after " +
(resp.numRetries+1) +
" tries. ";
if (resp.exceptionHistory != null) msg = msg + "[" + resp.exceptionHistory + "]";
msg = msg + "\n" + messageSuffix;
ADLException ex = new ADLException(msg);
ex.httpResponseCode = resp.httpResponseCode;
ex.httpResponseMessage = resp.httpResponseMessage;
ex.requestId = resp.requestId;
ex.numRetries = resp.numRetries;
ex.lastCallLatency = resp.lastCallLatency;
ex.responseContentLength = resp.responseContentLength;
ex.remoteExceptionName = resp.remoteExceptionName;
ex.remoteExceptionMessage = resp.remoteExceptionMessage;
ex.remoteExceptionJavaClassName = resp.remoteExceptionJavaClassName;
ex.initCause(resp.ex);
return ex;
}
}
private static IOException getRemoteException(String className, String message) {
try {
Class clazz = Class.forName(className);
if (!IOException.class.isAssignableFrom(clazz)) { return new IOException(message); }
Constructor c = clazz.getConstructor(String.class);
return (IOException) c.newInstance(message);
} catch (Exception ex) {
return new IOException(message);
}
}
}
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