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"""EBSBackend class with methods for supported APIs."""
from typing import Any, Optional
from moto.core.base_backend import BackendDict, BaseBackend
from moto.core.common_models import BaseModel
from moto.core.utils import unix_time
from moto.ec2.models import EC2Backend, ec2_backends
from moto.ec2.models.elastic_block_store import Snapshot
from moto.moto_api._internal import mock_random
class Block(BaseModel):
def __init__(
self, block_data: str, checksum: str, checksum_algorithm: str, data_length: str
):
self.block_data = block_data
self.checksum = checksum
self.checksum_algorithm = checksum_algorithm
self.data_length = data_length
self.block_token = str(mock_random.uuid4())
class EBSSnapshot(BaseModel):
def __init__(self, account_id: str, snapshot: Snapshot):
self.account_id = account_id
self.snapshot_id = snapshot.id
self.status = "pending"
self.start_time = unix_time()
self.volume_size = snapshot.volume.size
self.block_size = 512
self.tags = [
{"Key": t["key"], "Value": t["value"]} for t in snapshot.get_tags()
]
self.description = snapshot.description
self.blocks: dict[str, Block] = {}
def put_block(
self,
block_idx: str,
block_data: str,
checksum: str,
checksum_algorithm: str,
data_length: str,
) -> None:
block = Block(block_data, checksum, checksum_algorithm, data_length)
self.blocks[block_idx] = block
def to_json(self) -> dict[str, Any]:
return {
"SnapshotId": self.snapshot_id,
"OwnerId": self.account_id,
"Status": self.status,
"StartTime": self.start_time,
"VolumeSize": self.volume_size,
"BlockSize": self.block_size,
"Tags": self.tags,
"Description": self.description,
}
class EBSBackend(BaseBackend):
"""Implementation of EBS APIs."""
def __init__(self, region_name: str, account_id: str):
super().__init__(region_name, account_id)
self.snapshots: dict[str, EBSSnapshot] = {}
@property
def ec2_backend(self) -> EC2Backend:
return ec2_backends[self.account_id][self.region_name]
def start_snapshot(
self, volume_size: int, tags: Optional[list[dict[str, str]]], description: str
) -> EBSSnapshot:
"""
The following parameters are not yet implemented: ParentSnapshotId, ClientToken, Encrypted, KmsKeyArn, Timeout
"""
zone_name = f"{self.region_name}a"
vol = self.ec2_backend.create_volume(size=volume_size, zone_name=zone_name)
snapshot = self.ec2_backend.create_snapshot(
volume_id=vol.id, description=description
)
if tags:
snapshot.add_tags({tag["Key"]: tag["Value"] for tag in tags})
ebs_snapshot = EBSSnapshot(account_id=self.account_id, snapshot=snapshot)
self.snapshots[ebs_snapshot.snapshot_id] = ebs_snapshot
return ebs_snapshot
def complete_snapshot(self, snapshot_id: str) -> dict[str, str]:
"""
The following parameters are not yet supported: ChangedBlocksCount, Checksum, ChecksumAlgorithm, ChecksumAggregationMethod
"""
self.snapshots[snapshot_id].status = "completed"
return {"Status": "completed"}
def put_snapshot_block(
self,
snapshot_id: str,
block_index: str,
block_data: str,
checksum: str,
checksum_algorithm: str,
data_length: str,
) -> tuple[str, str]:
"""
The following parameters are currently not taken into account: DataLength, Progress.
The Checksum and ChecksumAlgorithm are taken at face-value, but no validation takes place.
"""
snapshot = self.snapshots[snapshot_id]
snapshot.put_block(
block_index, block_data, checksum, checksum_algorithm, data_length
)
return checksum, checksum_algorithm
def get_snapshot_block(self, snapshot_id: str, block_index: str) -> Block:
"""
The BlockToken-parameter is not yet implemented
"""
snapshot = self.snapshots[snapshot_id]
return snapshot.blocks[block_index]
def list_changed_blocks(
self, first_snapshot_id: str, second_snapshot_id: str
) -> tuple[dict[str, tuple[str, Optional[str]]], EBSSnapshot]:
"""
The following parameters are not yet implemented: NextToken, MaxResults, StartingBlockIndex
"""
snapshot1 = self.snapshots[first_snapshot_id]
snapshot2 = self.snapshots[second_snapshot_id]
changed_blocks: dict[
str, tuple[str, Optional[str]]
] = {} # {idx: (token1, token2), ..}
for idx in snapshot1.blocks:
block1 = snapshot1.blocks[idx]
if idx in snapshot2.blocks:
block2 = snapshot2.blocks[idx]
if block1.block_data != block2.block_data:
changed_blocks[idx] = (block1.block_token, block2.block_token)
else:
changed_blocks[idx] = (block1.block_token, None)
return changed_blocks, snapshot1
def list_snapshot_blocks(self, snapshot_id: str) -> EBSSnapshot:
"""
The following parameters are not yet implemented: NextToken, MaxResults, StartingBlockIndex
"""
return self.snapshots[snapshot_id]
ebs_backends = BackendDict(EBSBackend, "ebs")
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