Class: Hadoop::DFS::FileSystem
- Inherits:
-
Object
- Object
- Hadoop::DFS::FileSystem
- Defined in:
- ext/hdfs/hdfs.c
Instance Method Summary collapse
-
#capacity ⇒ Object
Returns the capacity of this HDFS file system in bytes, raising a DFSException if this was unsuccessful.
-
#cd(path) ⇒ Object
Changes the current working directory to the supplied path.
-
#chgrp(path, group) ⇒ Object
Changes the group of the supplied path.
-
#chgrp(path, mode = 644) ⇒ Object
Changes the mode of the supplied path.
-
#chown(path, owner) ⇒ Object
Changes the owner of the supplied path.
-
#copy(from_path, to_path, to_fs = nil) ⇒ Object
Copies the file at HDFS location from_path to HDFS location to_path.
-
#create_directory(path) ⇒ Object
Creates a directory at the supplied path.
-
#cwd ⇒ Object
Displays the current working directory; raises a DFSException if this fails.
-
#default_block_size ⇒ Object
Returns the default block size of this HDFS file system in bytes, raising a DFSException if this was unsuccessful.
-
#default_block_size_at_path(path) ⇒ Object
Returns the default block size at the supplied HDFS path, raising a DFSException if this was unsuccessful.
-
#delete(path, recursive = false) ⇒ Object
Deletes the file at the supplied path, recursively if specified.
-
#disconnect ⇒ nil
Disconnects the client connection.
-
#exist(path) ⇒ Boolean
Checks if a file exists at the supplied path.
-
#get_hosts(path, start, length) ⇒ Object
Returns the hostnames of the DataNodes which serve the portion of the file between the provided start and length bytes.
-
#new(options = {}) ⇒ Object
constructor
Creates a new HDFS client connection, configured by options, returning a new Hadoop::DFS::FileSystem object if successful.
-
#list_directory(path) ⇒ Object
Lists the directory at the supplied path, returning an Array of Hadoop::DFS::FileInfo objects.
-
#move(from_path, to_path, to_fs = nil) ⇒ Object
Moves the file at HDFS location from_path to HDFS location to_path.
-
#open(path, mode = 'r', options = {}) ⇒ File
Opens a file using the supplied mode and options.
-
#rename(from_path, to_path) ⇒ Object
Renames the file at the supplied path to the file at the destination path.
-
#set_replication(path, replication = 3) ⇒ Object
Sets the replication of the following path to the supplied number of nodes it will be replicated against.
-
#stat(path) ⇒ Object
Stats the file or directory at the supplied path, returning a Hadoop::DFS:FileInfo object corresponding to it.
-
#used ⇒ Object
Returns the bytes currently in use by this filesystem, raising a DFSException if unsuccessful.
-
#utime(path, modified_time = nil, access_time = nil) ⇒ Object
Changes the last modified and/or last access time in seconds since the Unix epoch for the supplied file.
Constructor Details
#new(options = {}) ⇒ Object
Creates a new HDFS client connection, configured by options, returning a new Hadoop::DFS::FileSystem object if successful. If this fails, raises a ConnectError.
options can have the following keys:
-
local: whether to use the local filesystem instead of HDFS (default: false)
-
host: hostname or IP address of a Hadoop NameNode (default: ‘0.0.0.0’)
-
port: port through which to connect to Hadoop NameNode (default: 8020)
-
user: user to connect to filesystem as (default: current user)
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# File 'ext/hdfs/hdfs.c', line 179
VALUE HDFS_File_System_initialize(int argc, VALUE* argv, VALUE self) {
VALUE options;
rb_scan_args(argc, argv, "01", &options);
if (TYPE(options) != T_HASH) {
rb_raise(e_dfs_exception, "options must be of type Hash");
}
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (NIL_P(options)) {
options = rb_hash_new();
}
VALUE r_user = rb_hash_aref(options, rb_eval_string(":user"));
char* hdfs_user = RTEST(r_user) ? RSTRING_PTR(r_user) :
(char*) HDFS_DEFAULT_USER;
VALUE r_local = rb_hash_aref(options, rb_eval_string(":local"));
if (r_local == Qtrue) {
data->fs = hdfsConnectAsUser(NULL, 0, hdfs_user);
} else {
VALUE r_host = rb_hash_aref(options, rb_eval_string(":host"));
VALUE r_port = rb_hash_aref(options, rb_eval_string(":port"));
// Sets default values for host and port if not supplied by user.
char* hdfs_host = RTEST(r_host) ? RSTRING_PTR(r_host) :
(char*) HDFS_DEFAULT_HOST;
int hdfs_port = RTEST(r_port) ? NUM2INT(r_port) :
HDFS_DEFAULT_PORT;
data->fs = hdfsConnectAsUser(hdfs_host, hdfs_port, hdfs_user);
}
if (data->fs == NULL) {
rb_raise(e_connect_error, "Failed to connect to HDFS");
return Qnil;
}
return self;
}
|
Instance Method Details
#capacity ⇒ Object
Returns the capacity of this HDFS file system in bytes, raising a DFSException if this was unsuccessful.
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# File 'ext/hdfs/hdfs.c', line 571
VALUE HDFS_File_System_capacity(VALUE self) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
long capacity = hdfsGetCapacity(data->fs);
if (capacity < 0) {
rb_raise(e_dfs_exception, "Error while retrieving capacity");
return Qnil;
}
return LONG2NUM(capacity);
}
|
#cd(path) ⇒ Object
Changes the current working directory to the supplied path. Returns True if successful; raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 401
VALUE HDFS_File_System_cd(VALUE self, VALUE path) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (hdfsSetWorkingDirectory(data->fs, RSTRING_PTR(path)) < 0) {
rb_raise(e_dfs_exception,
"Failed to change current working directory to path: %s",
RSTRING_PTR(path));
return Qnil;
}
return Qtrue;
}
|
#chgrp(path, group) ⇒ Object
Changes the group of the supplied path. Returns True if successful; raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 440
VALUE HDFS_File_System_chgrp(VALUE self, VALUE path, VALUE group) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (hdfsChown(data->fs, RSTRING_PTR(path), NULL, RSTRING_PTR(group)) < 0) {
rb_raise(e_dfs_exception, "Failed to chgrp path: %s to group: %s",
RSTRING_PTR(path), RSTRING_PTR(group));
return Qnil;
}
return Qtrue;
}
|
#chgrp(path, mode = 644) ⇒ Object
Changes the mode of the supplied path. Returns True if successful; raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 458
VALUE HDFS_File_System_chmod(int argc, VALUE* argv, VALUE self) {
VALUE path, mode;
rb_scan_args(argc, argv, "11", &path, &mode);
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
short hdfs_mode;
// Sets default mode if none is supplied.
if (NIL_P(mode)) {
hdfs_mode = HDFS_DEFAULT_MODE;
} else {
hdfs_mode = octal_decimal(NUM2INT(mode));
}
if (hdfsChmod(data->fs, RSTRING_PTR(path), hdfs_mode) < 0){
rb_raise(e_dfs_exception, "Failed to chmod user path: %s to mode: %d",
RSTRING_PTR(path), hdfs_mode);
return Qnil;
}
return Qtrue;
}
|
#chown(path, owner) ⇒ Object
Changes the owner of the supplied path. Returns True if successful; raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 485
VALUE HDFS_File_System_chown(VALUE self, VALUE path, VALUE owner) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (hdfsChown(data->fs, RSTRING_PTR(path), RSTRING_PTR(owner), NULL) < 0) {
rb_raise(e_dfs_exception, "Failed to chown user path: %s to user: %s",
RSTRING_PTR(path), RSTRING_PTR(owner));
return Qnil;
}
return Qtrue;
}
|
#copy(from_path, to_path, to_fs = nil) ⇒ Object
Copies the file at HDFS location from_path to HDFS location to_path. If to_fs is specified, copies to this HDFS over the current HDFS. If successful, returns True; otherwise, raises a DFSException.
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# File 'ext/hdfs/hdfs.c', line 504
VALUE HDFS_File_System_copy(int argc, VALUE* argv, VALUE self) {
VALUE from_path, to_path, to_fs;
rb_scan_args(argc, argv, "21", &from_path, &to_path, &to_fs);
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
hdfsFS destFS = data->fs;
// If no to_fs is supplied, copies to the current file system.
if (!NIL_P(to_fs)) {
if (CLASS_OF(to_fs) == c_file_system) {
FSData* destFSData = NULL;
Data_Get_Struct(to_fs, FSData, destFSData);
destFS = destFSData->fs;
} else {
rb_raise(rb_eArgError, "to_fs must be of type Hadoop::DFS::FileSystem");
return Qnil;
}
}
if (hdfsCopy(data->fs, RSTRING_PTR(from_path), destFS,
RSTRING_PTR(to_path)) < 0) {
rb_raise(e_dfs_exception, "Failed to copy path: %s to path: %s",
RSTRING_PTR(from_path), RSTRING_PTR(to_path));
return Qnil;
}
return Qtrue;
}
|
#create_directory(path) ⇒ Object
Creates a directory at the supplied path. If successful, returns True; raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 300
VALUE HDFS_File_System_create_directory(VALUE self, VALUE path) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (hdfsCreateDirectory(data->fs, RSTRING_PTR(path)) < 0) {
rb_raise(e_dfs_exception, "Could not create directory at path: %s",
RSTRING_PTR(path));
return Qnil;
}
return Qtrue;
}
|
#cwd ⇒ Object
Displays the current working directory; raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 419
VALUE HDFS_File_System_cwd(VALUE self) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
char* cur_dir = (char *) malloc(
sizeof(char) * HDFS_DEFAULT_PATH_STRING_LENGTH);
if (hdfsGetWorkingDirectory(data->fs, cur_dir,
HDFS_DEFAULT_PATH_STRING_LENGTH) < 0) {
free(cur_dir);
rb_raise(e_dfs_exception, "Failed to get current working directory");
return Qnil;
}
return rb_tainted_str_new2(cur_dir);
}
|
#default_block_size ⇒ Object
Returns the default block size of this HDFS file system in bytes, raising a DFSException if this was unsuccessful.
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# File 'ext/hdfs/hdfs.c', line 589
VALUE HDFS_File_System_default_block_size(VALUE self) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
long block_size = hdfsGetDefaultBlockSize(data->fs);
if (block_size < 0) {
rb_raise(e_dfs_exception, "Error while retrieving default block size");
return Qnil;
}
return LONG2NUM(block_size);
}
|
#default_block_size_at_path(path) ⇒ Object
Returns the default block size at the supplied HDFS path, raising a DFSException if this was unsuccessful.
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# File 'ext/hdfs/hdfs.c', line 607
VALUE HDFS_File_System_default_block_size_at_path(VALUE self, VALUE path) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
long block_size = hdfsGetDefaultBlockSizeAtPath(data->fs, RSTRING_PTR(path));
if (block_size < 0) {
rb_raise(e_dfs_exception,
"Error while retrieving default block size at path: %s", RSTRING_PTR(path));
return Qnil;
}
return LONG2NUM(block_size);
}
|
#delete(path, recursive = false) ⇒ Object
Deletes the file at the supplied path, recursively if specified. Returns True if successful, raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 244
VALUE HDFS_File_System_delete(int argc, VALUE* argv, VALUE self) {
VALUE path, recursive;
rb_scan_args(argc, argv, "11", &path, &recursive);
int hdfs_recursive = HDFS_DEFAULT_RECURSIVE_DELETE;
if (!NIL_P(recursive)) {
hdfs_recursive = (recursive == Qtrue) ? 1 : 0;
}
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (hdfsDelete(data->fs, RSTRING_PTR(path), hdfs_recursive) < 0) {
rb_raise(e_dfs_exception, "Could not delete file at path: %s",
RSTRING_PTR(path));
return Qnil;
}
return Qtrue;
}
|
#disconnect ⇒ nil
Disconnects the client connection.
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# File 'ext/hdfs/hdfs.c', line 227
VALUE HDFS_File_System_disconnect(VALUE self) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (data->fs != NULL) {
hdfsDisconnect(data->fs);
data->fs = NULL;
}
return Qnil;
}
|
#exist(path) ⇒ Boolean
Checks if a file exists at the supplied path. If file exists, returns True; if not, returns False.
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# File 'ext/hdfs/hdfs.c', line 286
VALUE HDFS_File_System_exist(VALUE self, VALUE path) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
int success = hdfsExists(data->fs, RSTRING_PTR(path));
return success == 0 ? Qtrue : Qfalse;
}
|
#get_hosts(path, start, length) ⇒ Object
Returns the hostnames of the DataNodes which serve the portion of the file between the provided start and length bytes. Raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 627
VALUE HDFS_File_System_get_hosts(VALUE self, VALUE path, VALUE start,
VALUE length) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
char*** hosts = hdfsGetHosts(data->fs, RSTRING_PTR(path), NUM2LONG(start),
NUM2LONG(length));
if (hosts == NULL) {
rb_raise(e_dfs_exception,
"Error while retrieving hosts at path: %s, start: %lu, length: %lu",
RSTRING_PTR(path), NUM2LONG(start), NUM2LONG(length));
return Qnil;
}
// Builds a Ruby Array object out of the hosts reported by HDFS.
VALUE hosts_array = rb_ary_new();
size_t i, j;
for (i = 0; hosts[i]; i++) {
VALUE cur_block_hosts = rb_ary_new();
for (j = 0; hosts[i][j]; j++) {
rb_ary_push(cur_block_hosts, rb_str_new2(hosts[i][j]));
}
rb_ary_push(hosts_array, cur_block_hosts);
}
return hosts_array;
}
|
#list_directory(path) ⇒ Object
Lists the directory at the supplied path, returning an Array of Hadoop::DFS::FileInfo objects. If the directory does not exist, raises a DoesNotExistError.
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# File 'ext/hdfs/hdfs.c', line 319
VALUE HDFS_File_System_list_directory(VALUE self, VALUE path) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
VALUE file_infos = rb_ary_new();
int num_files = 0;
hdfsFileInfo* infos = hdfsListDirectory(data->fs, RSTRING_PTR(path), &num_files);
if (infos == NULL) {
if (hdfsExists(data->fs, RSTRING_PTR(path)) == 0) {
return file_infos;
} else {
rb_raise(e_does_not_exist, "Directory does not exist: %s", RSTRING_PTR(path));
return Qnil;
}
}
int i;
for (i = 0; i < num_files; i++) {
hdfsFileInfo* cur_info = infos + i;
rb_ary_push(file_infos, wrap_hdfsFileInfo(cur_info));
}
hdfsFreeFileInfo(infos, num_files);
return file_infos;
}
|
#move(from_path, to_path, to_fs = nil) ⇒ Object
Moves the file at HDFS location from_path to HDFS location to_path. If to_fs is specified, moves to this HDFS over the current HDFS. If successful, returns true; otherwise, returns false.
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# File 'ext/hdfs/hdfs.c', line 538
VALUE HDFS_File_System_move(int argc, VALUE* argv, VALUE self) {
VALUE from_path, to_path, to_fs;
rb_scan_args(argc, argv, "21", &from_path, &to_path, &to_fs);
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
hdfsFS destFS = data->fs;
// If no to_fs is supplied, moves to the current file system.
if (!NIL_P(to_fs)) {
if (CLASS_OF(to_fs) == c_file_system) {
FSData* destFSData = NULL;
Data_Get_Struct(to_fs, FSData, destFSData);
destFS = destFSData->fs;
} else {
rb_raise(rb_eArgError, "to_fs must be of type Hadoop::DFS::FileSystem");
return Qnil;
}
}
if (hdfsMove(data->fs, RSTRING_PTR(from_path), destFS,
RSTRING_PTR(to_path)) < 0) {
rb_raise(e_dfs_exception, "Error while moving path: %s to path: %s",
RSTRING_PTR(from_path), RSTRING_PTR(to_path));
return Qnil;
}
return Qtrue;
}
|
#open(path, mode = 'r', options = {}) ⇒ File
Opens a file using the supplied mode and options. If the file cannot be opened, raises a CouldNotOpenError; otherwise, returns a Hadoop::DFS::File object corresponding to the file.
options can have the following keys:
-
buffer_size: size in bytes of buffer to use for file accesses (default: default buffer size as configured by HDFS)
-
replication: the number of nodes this file should be replicated against (default: default replication as configured by HDFS)
-
block_size: the HDFS block size in bytes to use for this file (default: default block size as configured by HDFS)
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# File 'ext/hdfs/hdfs.c', line 721
VALUE HDFS_File_System_open(int argc, VALUE* argv, VALUE self) {
VALUE path, mode, options;
int flags = O_RDONLY;
rb_scan_args(argc, argv, "12", &path, &mode, &options);
// Sets file open mode if one is provided by the user.
if (!NIL_P(mode)) {
if (strcmp("r", StringValuePtr(mode)) == 0) {
flags = O_RDONLY;
} else if (strcmp("w", StringValuePtr(mode)) == 0) {
flags = O_WRONLY;
} else {
rb_raise(rb_eArgError, "Mode must be 'r' or 'w'");
return Qnil;
}
}
options = NIL_P(options) ? rb_hash_new() : options;
VALUE r_buffer_size = rb_hash_aref(options, rb_eval_string(":buffer_size"));
VALUE r_replication = rb_hash_aref(options, rb_eval_string(":replication"));
VALUE r_block_size = rb_hash_aref(options, rb_eval_string(":block_size"));
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
hdfsFile file = hdfsOpenFile(data->fs, RSTRING_PTR(path), flags,
RTEST(r_buffer_size) ? NUM2INT(r_buffer_size) : 0,
RTEST(r_replication) ? NUM2INT(r_replication) : 0,
RTEST(r_block_size) ? NUM2INT(r_block_size) : 0);
if (file == NULL) {
rb_raise(e_could_not_open, "Could not open file %s", RSTRING_PTR(path));
return Qnil;
}
FileData* file_data = ALLOC_N(FileData, 1);
file_data->fs = data->fs;
file_data->file = file;
VALUE file_instance = Data_Wrap_Struct(c_file, NULL, free_file_data, file_data);
return file_instance;
}
|
#rename(from_path, to_path) ⇒ Object
Renames the file at the supplied path to the file at the destination path. Returns True if successful, raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 268
VALUE HDFS_File_System_rename(VALUE self, VALUE from_path, VALUE to_path) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (hdfsRename(data->fs, RSTRING_PTR(from_path), RSTRING_PTR(to_path)) < 0) {
rb_raise(e_dfs_exception, "Could not rename path: %s to path: %s",
RSTRING_PTR(from_path), RSTRING_PTR(to_path));
return Qnil;
}
return Qtrue;
}
|
#set_replication(path, replication = 3) ⇒ Object
Sets the replication of the following path to the supplied number of nodes it will be replicated against. Returns True if successful; raises a DFSException if this fails.
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# File 'ext/hdfs/hdfs.c', line 374
VALUE HDFS_File_System_set_replication(int argc, VALUE* argv, VALUE self) {
VALUE path, replication;
rb_scan_args(argc, argv, "11", &path, &replication);
int hdfs_replication;
// If no replication value is supplied, uses default replication value.
if (NIL_P(replication)) {
hdfs_replication = HDFS_DEFAULT_REPLICATION;
} else {
hdfs_replication = NUM2INT(replication);
}
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (hdfsSetReplication(data->fs, RSTRING_PTR(path), hdfs_replication) < 0) {
rb_raise(e_dfs_exception, "Failed to set replication to: %d at path: %s",
hdfs_replication, RSTRING_PTR(path));
return Qnil;
}
return Qtrue;
}
|
#stat(path) ⇒ Object
Stats the file or directory at the supplied path, returning a Hadoop::DFS:FileInfo object corresponding to it. If the file or directory does not exist, raises a DoesNotExistError.
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# File 'ext/hdfs/hdfs.c', line 353
VALUE HDFS_File_System_stat(VALUE self, VALUE path) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
hdfsFileInfo* info = hdfsGetPathInfo(data->fs, RSTRING_PTR(path));
if (info == NULL) {
rb_raise(e_does_not_exist, "File does not exist: %s", RSTRING_PTR(path));
return Qnil;
}
VALUE file_info = wrap_hdfsFileInfo(info);
hdfsFreeFileInfo(info, 1);
return file_info;
}
|
#used ⇒ Object
Returns the bytes currently in use by this filesystem, raising a DFSException if unsuccessful.
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# File 'ext/hdfs/hdfs.c', line 659
VALUE HDFS_File_System_used(VALUE self) {
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
long used = hdfsGetUsed(data->fs);
if (used < 0) {
rb_raise(e_dfs_exception, "Error while retrieving used capacity");
return Qnil;
}
return LONG2NUM(used);
}
|
#utime(path, modified_time = nil, access_time = nil) ⇒ Object
Changes the last modified and/or last access time in seconds since the Unix epoch for the supplied file. Returns true if successful; false if not.
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# File 'ext/hdfs/hdfs.c', line 677
VALUE HDFS_File_System_utime(int argc, VALUE* argv, VALUE self) {
VALUE path, modified_time, access_time;
tTime hdfs_modified_time, hdfs_access_time;
rb_scan_args(argc, argv, "12", &path, &modified_time, &access_time);
// Sets default values for last modified and/or last access time.
if (NIL_P(modified_time)) {
hdfs_modified_time = -1;
} else {
hdfs_modified_time = NUM2LONG(modified_time);
}
if (NIL_P(access_time)) {
hdfs_access_time = -1;
} else {
hdfs_access_time = NUM2LONG(access_time);
}
FSData* data = NULL;
Data_Get_Struct(self, FSData, data);
if (hdfsUtime(data->fs, RSTRING_PTR(path), hdfs_modified_time,
hdfs_access_time) < 0) {
rb_raise(e_dfs_exception,
"Error while setting modified time: %lu, access time: %lu at path: %s",
(long) hdfs_modified_time, (long) hdfs_access_time, RSTRING_PTR(path));
return Qnil;
}
return Qtrue;
}
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