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Advertize zlib support via feature bits
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Add a feature bit to zlib compression support.
This compression will be used in several places, currently in extended
gossip queries.
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@t-bast
t-bast committed Dec 14, 2020
1 parent d0c8385 commit 35c479d
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2 changes: 2 additions & 0 deletions 07-routing-gossip.md
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Expand Up @@ -571,6 +571,7 @@ simple compression scheme: the first byte indicates the encoding, the
rest contains the data.

Encoding types:

* `0`: uncompressed array of `short_channel_id` types, in ascending order.
* `1`: array of `short_channel_id` types, in ascending order, compressed with zlib deflate<sup>[1](#reference-1)</sup>

Expand All @@ -588,6 +589,7 @@ Query messages can be extended with optional fields that can help reduce the num
- checksum-based filtering of `channel_update` messages: only ask for `channel_update` messages that carry different information from the ones you already have.

Nodes can signal that they support extended gossip queries with the `gossip_queries_ex` feature bit.
Nodes can signal that they support zlib compression with the `zlib_compress` feature bit.

### The `query_short_channel_ids`/`reply_short_channel_ids_end` Messages

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28 changes: 14 additions & 14 deletions 09-features.md
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Expand Up @@ -26,20 +26,20 @@ The Context column decodes as follows:
* `C+`: presented in the `channel_announcement` message, but always even (required).
* `9`: presented in [BOLT 11](11-payment-encoding.md) invoices.

| Bits | Name | Description | Context | Dependencies | Link |
|-------|----------------------------------|-----------------------------------------------------------|----------|-------------------|---------------------------------------|
| 0/1 | `option_data_loss_protect` | Requires or supports extra `channel_reestablish` fields | IN | | [BOLT #2][bolt02-retransmit] |
| 3 | `initial_routing_sync` | Sending node needs a complete routing information dump | I | | [BOLT #7][bolt07-sync] |
| 4/5 | `option_upfront_shutdown_script` | Commits to a shutdown scriptpubkey when opening channel | IN | | [BOLT #2][bolt02-open] |
| 6/7 | `gossip_queries` | More sophisticated gossip control | IN | | [BOLT #7][bolt07-query] |
| 8/9 | `var_onion_optin` | Requires/supports variable-length routing onion payloads | IN9 | | [Routing Onion Specification][bolt04] |
| 10/11 | `gossip_queries_ex` | Gossip queries can include additional information | IN | `gossip_queries` | [BOLT #7][bolt07-query] |
| 12/13 | `option_static_remotekey` | Static key for remote output | IN | | [BOLT #3](03-transactions.md) |
| 14/15 | `payment_secret` | Node supports `payment_secret` field | IN9 | `var_onion_optin` | [Routing Onion Specification][bolt04] |
| 16/17 | `basic_mpp` | Node can receive basic multi-part payments | IN9 | `payment_secret` | [BOLT #4][bolt04-mpp] |
| 18/19 | `option_support_large_channel` | Can create large channels | IN | | [BOLT #2](02-peer-protocol.md#the-open_channel-message) |
| 20/21 | `option_anchor_outputs` | Anchor outputs | IN | `option_static_remotekey` | [BOLT #3](03-transactions.md) |

| Bits | Name | Description | Context | Dependencies | Link |
|-------|----------------------------------|-----------------------------------------------------------|----------|---------------------------|---------------------------------------------------------|
| 0/1 | `option_data_loss_protect` | Requires or supports extra `channel_reestablish` fields | IN | | [BOLT #2][bolt02-retransmit] |
| 3 | `initial_routing_sync` | Sending node needs a complete routing information dump | I | | [BOLT #7][bolt07-sync] |
| 4/5 | `option_upfront_shutdown_script` | Commits to a shutdown scriptpubkey when opening channel | IN | | [BOLT #2][bolt02-open] |
| 6/7 | `gossip_queries` | More sophisticated gossip control | IN | | [BOLT #7][bolt07-query] |
| 8/9 | `var_onion_optin` | Requires/supports variable-length routing onion payloads | IN9 | | [Routing Onion Specification][bolt04] |
| 10/11 | `gossip_queries_ex` | Gossip queries can include additional information | IN | `gossip_queries` | [BOLT #7][bolt07-query] |
| 12/13 | `option_static_remotekey` | Static key for remote output | IN | | [BOLT #3](03-transactions.md) |
| 14/15 | `payment_secret` | Node supports `payment_secret` field | IN9 | `var_onion_optin` | [Routing Onion Specification][bolt04] |
| 16/17 | `basic_mpp` | Node can receive basic multi-part payments | IN9 | `payment_secret` | [BOLT #4][bolt04-mpp] |
| 18/19 | `option_support_large_channel` | Can create large channels | IN | | [BOLT #2](02-peer-protocol.md#the-open_channel-message) |
| 20/21 | `option_anchor_outputs` | Anchor outputs | IN | `option_static_remotekey` | [BOLT #3](03-transactions.md) |
| 24/25 | `zlib_compress` | Support for zlib compression | IN | `gossip_queries_ex` | [BOLT #7][bolt07-query] |
## Requirements

The origin node:
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