from msgpack import packb, Unpacker
from snappy import compress, decompress  # noqa
from btree import Tree, Node, Leaf, LazyNode


def encode_btree(obj):
    if isinstance(obj, (Tree, Node, Leaf)):
        return {'__class__': obj.__class__.__name__,
                'data': obj.to_json()}
    elif isinstance(obj, LazyNode):
        return obj.offset
    return obj


def encode(data):
    return packb(data, default=encode_btree)


def decode(data, tree):
    def decode_btree(obj):
        if b'__class__' in obj:
            cls_name = obj[b'__class__'].decode()
            data = obj[b'data']
            if cls_name == 'Leaf':
                obj = Leaf(tree, bucket=bucket_to_lazynodes(data, tree))
            elif cls_name == 'Node':
                bucket = bucket_to_lazynodes(data[b'bucket'], tree)
                obj = Node(tree, bucket=bucket,
                           rest=LazyNode(offset=data[b'rest'], tree=tree))
            else:
                tree.max_size = data[b'max_size']
                tree.root = LazyNode(offset=data[b'root'], tree=tree)
                return tree
        return obj

    unpacker = Unpacker(data, object_hook=decode_btree)
    return(next(unpacker))


def bucket_to_lazynodes(bucket, tree):
    return {k: LazyNode(offset=v, tree=tree) for k, v in bucket.items()}

from msgpack import packb, unpackb, Unpacker
from snappy import compress, decompress  # noqa
from btree import Tree, Node, Leaf, LazyNode
from checksum import add_integrity, check_integrity


def encode_btree(obj):
    if isinstance(obj, (Tree, Node, Leaf)):
        return {'__class__': obj.__class__.__name__,
                'data': obj.to_json()}
    elif isinstance(obj, LazyNode):
        return obj.offset
    return obj


def encode(data):
    return packb(compress(add_integrity(packb(data, default=encode_btree))))


def decode(data, tree):
    def decode_btree(obj):
        if b'__class__' in obj:
            cls_name = obj[b'__class__'].decode()
            data = obj[b'data']
            if cls_name == 'Leaf':
                obj = Leaf(tree, bucket=bucket_to_lazynodes(data, tree))
            elif cls_name == 'Node':
                bucket = bucket_to_lazynodes(data[b'bucket'], tree)
                obj = Node(tree, bucket=bucket,
                           rest=LazyNode(offset=data[b'rest'], tree=tree))
            else:
                tree.max_size = data[b'max_size']
                tree.root = LazyNode(offset=data[b'root'], tree=tree)
                return tree
        return obj

    data = decompress(next(Unpacker(data)))

    return unpackb(check_integrity(data), object_hook=decode_btree)


def bucket_to_lazynodes(bucket, tree):
    return {k: LazyNode(offset=v, tree=tree) for k, v in bucket.items()}

Add compression and integrity checks
Add compression and integrity checks

- from msgpack import packb, Unpacker
+ from msgpack import packb, unpackb, Unpacker
  from snappy import compress, decompress  # noqa
  from btree import Tree, Node, Leaf, LazyNode
+ from checksum import add_integrity, check_integrity
  
  
  def encode_btree(obj):
      if isinstance(obj, (Tree, Node, Leaf)):
          return {'__class__': obj.__class__.__name__,
                  'data': obj.to_json()}
      elif isinstance(obj, LazyNode):
          return obj.offset
      return obj
  
  
  def encode(data):
-     return packb(data, default=encode_btree)
+     return packb(compress(add_integrity(packb(data, default=encode_btree))))
  
  
  def decode(data, tree):
      def decode_btree(obj):
          if b'__class__' in obj:
              cls_name = obj[b'__class__'].decode()
              data = obj[b'data']
              if cls_name == 'Leaf':
                  obj = Leaf(tree, bucket=bucket_to_lazynodes(data, tree))
              elif cls_name == 'Node':
                  bucket = bucket_to_lazynodes(data[b'bucket'], tree)
                  obj = Node(tree, bucket=bucket,
                             rest=LazyNode(offset=data[b'rest'], tree=tree))
              else:
                  tree.max_size = data[b'max_size']
                  tree.root = LazyNode(offset=data[b'root'], tree=tree)
                  return tree
          return obj
  
+     data = decompress(next(Unpacker(data)))
+ 
-     unpacker = Unpacker(data, object_hook=decode_btree)
+     return unpackb(check_integrity(data), object_hook=decode_btree)
-     return(next(unpacker))
  
  
  def bucket_to_lazynodes(bucket, tree):
      return {k: LazyNode(offset=v, tree=tree) for k, v in bucket.items()}
  
Add compression and integrity checks
## Code Before:
from msgpack import packb, Unpacker
from snappy import compress, decompress  # noqa
from btree import Tree, Node, Leaf, LazyNode


def encode_btree(obj):
    if isinstance(obj, (Tree, Node, Leaf)):
        return {'__class__': obj.__class__.__name__,
                'data': obj.to_json()}
    elif isinstance(obj, LazyNode):
        return obj.offset
    return obj


def encode(data):
    return packb(data, default=encode_btree)


def decode(data, tree):
    def decode_btree(obj):
        if b'__class__' in obj:
            cls_name = obj[b'__class__'].decode()
            data = obj[b'data']
            if cls_name == 'Leaf':
                obj = Leaf(tree, bucket=bucket_to_lazynodes(data, tree))
            elif cls_name == 'Node':
                bucket = bucket_to_lazynodes(data[b'bucket'], tree)
                obj = Node(tree, bucket=bucket,
                           rest=LazyNode(offset=data[b'rest'], tree=tree))
            else:
                tree.max_size = data[b'max_size']
                tree.root = LazyNode(offset=data[b'root'], tree=tree)
                return tree
        return obj

    unpacker = Unpacker(data, object_hook=decode_btree)
    return(next(unpacker))


def bucket_to_lazynodes(bucket, tree):
    return {k: LazyNode(offset=v, tree=tree) for k, v in bucket.items()}

## Instruction:
Add compression and integrity checks
## Code After:
from msgpack import packb, unpackb, Unpacker
from snappy import compress, decompress  # noqa
from btree import Tree, Node, Leaf, LazyNode
from checksum import add_integrity, check_integrity


def encode_btree(obj):
    if isinstance(obj, (Tree, Node, Leaf)):
        return {'__class__': obj.__class__.__name__,
                'data': obj.to_json()}
    elif isinstance(obj, LazyNode):
        return obj.offset
    return obj


def encode(data):
    return packb(compress(add_integrity(packb(data, default=encode_btree))))


def decode(data, tree):
    def decode_btree(obj):
        if b'__class__' in obj:
            cls_name = obj[b'__class__'].decode()
            data = obj[b'data']
            if cls_name == 'Leaf':
                obj = Leaf(tree, bucket=bucket_to_lazynodes(data, tree))
            elif cls_name == 'Node':
                bucket = bucket_to_lazynodes(data[b'bucket'], tree)
                obj = Node(tree, bucket=bucket,
                           rest=LazyNode(offset=data[b'rest'], tree=tree))
            else:
                tree.max_size = data[b'max_size']
                tree.root = LazyNode(offset=data[b'root'], tree=tree)
                return tree
        return obj

    data = decompress(next(Unpacker(data)))

    return unpackb(check_integrity(data), object_hook=decode_btree)


def bucket_to_lazynodes(bucket, tree):
    return {k: LazyNode(offset=v, tree=tree) for k, v in bucket.items()}
