def on_head(self, req, resp, vault_id, block_id):
"""Checks for the existence of the block in the
metadata storage and if successful check for it in
the storage driver
if it fails we return a 502, otherwise we return
all other headers returned on
GET /v1.0/vaults/{vault_id}/blocks/{block_id}
"""
vault = Vault.get(vault_id)
if not vault:
logger.error('Vault [{0}] does not exist'.format(vault_id))
raise errors.HTTPNotFound
# This is safe to construct before we check the status of the block
# b/c the constructor does not do anything other than save values
# to itself, no lookups, etc
block = Block(vault_id, block_id)
try:
if not vault.has_block(block_id, check_storage=True):
logger.error('block [{0}] does not exist'.format(block_id))
raise errors.HTTPNotFound
ref_cnt = block.get_ref_count()
resp.set_header('X-Block-Reference-Count', str(ref_cnt))
ref_mod = block.get_ref_modified()
resp.set_header('X-Ref-Modified', str(ref_mod))
storage_id = block.get_storage_id()
resp.set_header('X-Storage-ID', str(storage_id))
resp.set_header('X-Block-ID', str(block_id))
resp.set_header('X-Block-Size',
str(block.get_block_length()))
resp.status = falcon.HTTP_204
except ConsistencyError as ex:
# We have the block in metadata...
# so we can get anything that only touches metadata
ref_cnt = block.get_ref_count()
resp.set_header('X-Block-Reference-Count', str(ref_cnt))
ref_mod = block.get_ref_modified()
resp.set_header('X-Ref-Modified', str(ref_mod))
storage_id = block.get_storage_id()
resp.set_header('X-Storage-ID', str(storage_id))
resp.set_header('X-Block-ID', str(block_id))
# Block-size is retrieved from storage...
logger.error(ex)
raise errors.HTTPGone(str(ex))
def on_head(self, req, resp, vault_id, block_id):
"""Checks for the existence of the block in the
metadata storage and if successful check for it in
the storage driver
if it fails we return a 502, otherwise we return
all other headers returned on
GET /v1.0/vaults/{vault_id}/blocks/{block_id}
"""
vault = Vault.get(vault_id)
if not vault:
logger.error('Vault [{0}] does not exist'.format(vault_id))
raise errors.HTTPNotFound
# This is safe to construct before we check the status of the block
# b/c the constructor does not do anything other than save values
# to itself, no lookups, etc
block = Block(vault_id, block_id)
try:
if not vault.has_block(block_id, check_storage=True):
logger.error('block [{0}] does not exist'.format(block_id))
raise errors.HTTPNotFound
ref_cnt = block.get_ref_count()
resp.set_header('X-Block-Reference-Count', str(ref_cnt))
ref_mod = block.get_ref_modified()
resp.set_header('X-Ref-Modified', str(ref_mod))
storage_id = block.get_storage_id()
resp.set_header('X-Storage-ID', str(storage_id))
resp.set_header('X-Block-ID', str(block_id))
resp.set_header('X-Block-Size',
str(block.get_block_length()))
resp.status = falcon.HTTP_204
except ConsistencyError as ex:
# We have the block in metadata...
# so we can get anything that only touches metadata
ref_cnt = block.get_ref_count()
resp.set_header('X-Block-Reference-Count', str(ref_cnt))
ref_mod = block.get_ref_modified()
resp.set_header('X-Ref-Modified', str(ref_mod))
storage_id = block.get_storage_id()
resp.set_header('X-Storage-ID', str(storage_id))
resp.set_header('X-Block-ID', str(block_id))
# Block-size is retrieved from storage...
logger.error(ex)
raise errors.HTTPGone(str(ex))
def get_block(self, storage_block_id):
"""Get a block directly from storage
"""
metadata_block_id = self.get_metadata_id(storage_block_id)
obj = deuce.storage_driver.get_block_obj(self.vault_id,
storage_block_id)
return Block(self.vault_id,
metadata_block_id,
obj=obj,
storage_block_id=storage_block_id) if obj else None
def delete_block(self, storage_block_id):
block_id = self.get_metadata_id(storage_block_id)
block = Block(self.vault_id,
block_id,
storage_block_id=storage_block_id) if block_id else None
ref_count = block.get_ref_count() if block else None
if block is None:
return deuce.storage_driver.delete_block(self.vault_id,
storage_block_id)
else:
msg = "Storage ID: {0} has {1} " \
"reference(s) in metadata".format(
storage_block_id,
ref_count)
raise ConstraintError(deuce.context.project_id, self.vault_id, msg)
def delete_block(self, storage_block_id):
block_id = self.get_metadata_id(storage_block_id)
block = Block(self.vault_id,
block_id,
storage_block_id=storage_block_id) if block_id else None
ref_count = block.get_ref_count() if block else None
if block is None:
return deuce.storage_driver.delete_block(self.vault_id,
storage_block_id)
else:
msg = "Storage ID: {0} has {1} " \
"reference(s) in metadata".format(
storage_block_id,
ref_count)
raise ConstraintError(deuce.context.project_id,
self.vault_id,
msg)
def on_get(self, req, resp, vault_id, block_id):
"""Returns a specific block"""
# Step 1: Is the block in our vault store? If not, return 404
# Step 2: Stream the block back to the user
vault = Vault.get(vault_id)
# Existence of the vault should have been confirmed
# in the vault controller
assert vault is not None
try:
block = vault.get_block(block_id)
if block is None:
logger.error('block [{0}] does not exist'.format(block_id))
# We have to do the has_block() check in order to
# differentiate between a 404 and 410 error.
# 404 should be returned if even metadata doesn't know
# about the block; while 410 should be returned if
# metadata knows about the block but it is not found
# in storage. Since we already know the block doesn't
# exist in storage, we can skip the storage check
if vault.has_block(block_id, check_storage=False):
logger.error(
'block [{0}] does not exist (vault check)'.format(
block_id))
raise ConsistencyError(deuce.context.project_id,
vault_id,
block_id,
msg='Block does not exist'
' in Block Storage')
raise errors.HTTPNotFound
ref_cnt = block.get_ref_count()
resp.set_header('X-Block-Reference-Count', str(ref_cnt))
ref_mod = block.get_ref_modified()
resp.set_header('X-Ref-Modified', str(ref_mod))
storage_id = block.get_storage_id()
resp.set_header('X-Storage-ID', str(storage_id))
resp.set_header('X-Block-ID', str(block_id))
resp.stream = block.get_obj()
resp.stream_len = block.get_block_length()
resp.status = falcon.HTTP_200
resp.content_type = 'application/octet-stream'
except ConsistencyError as ex:
# We have the block in metadata...
# so we can get anything that only touches metadata
block = Block(vault_id, block_id)
ref_cnt = block.get_ref_count()
resp.set_header('X-Block-Reference-Count', str(ref_cnt))
ref_mod = block.get_ref_modified()
resp.set_header('X-Ref-Modified', str(ref_mod))
storage_id = block.get_storage_id()
resp.set_header('X-Storage-ID', str(storage_id))
resp.set_header('X-Block-ID', str(block_id))
# Block-size is retrieved from storage...
logger.error(ex)
raise errors.HTTPGone(str(ex))
def on_get(self, req, resp, vault_id, block_id):
"""Returns a specific block"""
# Step 1: Is the block in our vault store? If not, return 404
# Step 2: Stream the block back to the user
vault = Vault.get(vault_id)
# Existence of the vault should have been confirmed
# in the vault controller
assert vault is not None
try:
block = vault.get_block(block_id)
if block is None:
logger.error('block [{0}] does not exist'
.format(block_id))
# We have to do the has_block() check in order to
# differentiate between a 404 and 410 error.
# 404 should be returned if even metadata doesn't know
# about the block; while 410 should be returned if
# metadata knows about the block but it is not found
# in storage. Since we already know the block doesn't
# exist in storage, we can skip the storage check
if vault.has_block(block_id, check_storage=False):
logger.error('block [{0}] does not exist (vault check)'
.format(block_id))
raise ConsistencyError(deuce.context.project_id,
vault_id, block_id,
msg='Block does not exist'
' in Block Storage')
raise errors.HTTPNotFound
ref_cnt = block.get_ref_count()
resp.set_header('X-Block-Reference-Count', str(ref_cnt))
ref_mod = block.get_ref_modified()
resp.set_header('X-Ref-Modified', str(ref_mod))
storage_id = block.get_storage_id()
resp.set_header('X-Storage-ID', str(storage_id))
resp.set_header('X-Block-ID', str(block_id))
resp.stream = block.get_obj()
resp.stream_len = block.get_block_length()
resp.status = falcon.HTTP_200
resp.content_type = 'application/octet-stream'
except ConsistencyError as ex:
# We have the block in metadata...
# so we can get anything that only touches metadata
block = Block(vault_id, block_id)
ref_cnt = block.get_ref_count()
resp.set_header('X-Block-Reference-Count', str(ref_cnt))
ref_mod = block.get_ref_modified()
resp.set_header('X-Ref-Modified', str(ref_mod))
storage_id = block.get_storage_id()
resp.set_header('X-Storage-ID', str(storage_id))
resp.set_header('X-Block-ID', str(block_id))
# Block-size is retrieved from storage...
logger.error(ex)
raise errors.HTTPGone(str(ex))
