Make it easy to create round-trippable bencoding for objects.
import typed_bencode
from typing import List
my_type = typed_bencode.for_dict(a=str, b=int, c=bytes, d=List[str])
val = {"a": "hello", "b": 123, "c": b'asd', "d":["hey", "there"]}
encoded = my_type.encode(val)
print(encoded) # => b'd1:a5:hello1:bi123e1:c3:asd1:dl3:hey5:thereee'
print(my_type.decode(encoded) == val) # => True
You can even compose types
my_other_type = typed_bencode.for_dict(a=my_type, b=int)
encoded2 = my_other_type.encode({"a": {"a": "helo", "b": 123, "c": b'asd', "d": ["asd", "asd"]}, "b":123})
print(encoded2) # => b'd1:ad1:a4:helo1:bi123e1:c3:asd1:dl3:asd3:asdee1:bi123ee'
You can specify a custom type
class DateEncoder(typed_bencode.StringEncoder):
def to_bytes(self, val):
return super().to_bytes(val.isoformat())
class DateDecoder(typed_bencode.StringDecoder):
def from_bytes(self, b):
v, pos = super().from_bytes(b)
return (datetime.datetime.fromisoformat(v), pos)
class DateType(typed_bencode.BaseType):
def __init__(self):
super().__init__()
self.encoder = DateEncoder(self)
self.decoder = DateDecoder(self)
my_type = DateType()
val = datetime.datetime.now()
encoded = my_type.encode(val) # => '26:2018-06-06T12:12:12.363636'