Commit Graph

3 Commits

Author SHA1 Message Date
Conner Fromknecht
6015567927
htlcswitch/iterator: validate presence/omission of payload types
From BOLT 04:

The writer:
 - MUST include amt_to_forward and outgoing_cltv_value for every node.
 - MUST include short_channel_id for every non-final node.
 - MUST NOT include short_channel_id for the final node.
2019-09-05 09:32:03 -07:00
Conner Fromknecht
aefec9b10f
tlv: return parsed types from DecodeWithParsedTypes
This commit adds an additional return value to
Stream.DecodeWithParsedTypes, which returns the set of types that were
encountered during decoding. The set will contain all known types that
were decoded, as well as unknown odd types that were ignored.

The rationale for the return value (rather than an internal member) is
so that the stream remains stateless.

This return value can be used by callers during decoding to make
assertions as to whether specific types were included in the stream.
This is need, for example, when parsing onion payloads where certain
fields must be included/omitted depending on the hop type.

The original Decode method would incur the additional performance hit of
needing to track the parsed types, so we can selectively enable this
functionality when a decoder requires it by using a helper which
conditionally tracks the parsed types.
2019-09-05 09:30:37 -07:00
Conner Fromknecht
138b0798f5
htlcswitch/iterator: use hop.Payload constructors 2019-09-05 01:35:24 -07:00