The oslo_vmware.rw_handles Module

Classes defining read and write handles for image transfer.

This module defines various classes for reading and writing files including VMDK files in VMware servers. It also contains a class to read images from glance server.

class oslo_vmware.rw_handles.FileHandle(file_handle)

Bases: object

Base class for VMware server file (including VMDK) access over HTTP.

This class wraps a backing file handle and provides utility methods for various sub-classes.

close()

Close the file handle.

get_size()

Get size of the file to be read.

Raises:NotImplementedError
read(chunk_size)

Read a chunk of data.

Parameters:chunk_size – read chunk size
Raises:NotImplementedError
write(data)

Write data to the file.

Parameters:data – data to be written
Raises:NotImplementedError
class oslo_vmware.rw_handles.FileWriteHandle(host, port, data_center_name, datastore_name, cookies, file_path, file_size, scheme=’https’, cacerts=False, thumbprint=None)

Bases: oslo_vmware.rw_handles.FileHandle

Write handle for a file in VMware server.

close()

Get the response and close the connection.

write(data)

Write data to the file.

Parameters:data – data to be written
Raises:VimConnectionException, VimException
class oslo_vmware.rw_handles.ImageReadHandle(glance_read_iter)

Bases: object

Read handle for glance images.

close()

Close the read handle.

This is a NOP.

get_next()

Get the next item from the image iterator.

read(chunk_size)

Read an item from the image data iterator.

The input chunk size is ignored since the client ImageBodyIterator uses its own chunk size.

class oslo_vmware.rw_handles.VmdkHandle(session, lease, url, file_handle)

Bases: oslo_vmware.rw_handles.FileHandle

VMDK handle based on HttpNfcLease.

update_progress()

Updates progress to lease.

This call back to the lease is essential to keep the lease alive across long running write/read operations.

Raises:VimException, VimFaultException, VimAttributeException, VimSessionOverLoadException, VimConnectionException
class oslo_vmware.rw_handles.VmdkReadHandle(session, host, port, vm_ref, vmdk_path, vmdk_size)

Bases: oslo_vmware.rw_handles.VmdkHandle

VMDK read handle based on HttpNfcLease.

close()

Releases the lease and close the connection.

Raises:VimException, VimFaultException, VimAttributeException, VimSessionOverLoadException, VimConnectionException
read(chunk_size)

Read a chunk of data from the VMDK file.

Parameters:chunk_size – size of read chunk
Returns:the data
Raises:VimException
class oslo_vmware.rw_handles.VmdkWriteHandle(session, host, port, rp_ref, vm_folder_ref, import_spec, vmdk_size, http_method=’PUT’)

Bases: oslo_vmware.rw_handles.VmdkHandle

VMDK write handle based on HttpNfcLease.

This class creates a vApp in the specified resource pool and uploads the virtual disk contents.

close()

Releases the lease and close the connection.

Raises:VimAttributeException, VimSessionOverLoadException, VimConnectionException
get_imported_vm()

“Get managed object reference of the VM created for import.

write(data)

Write data to the file.

Parameters:data – data to be written
Raises:VimConnectionException, VimException