listpeers: include the pushed_msat amount

Useful for accounting for missed/historical channel opens, to figure out
what the actual sat contribution from each peer is at a utxo level

Changelog-Added: JSONRPC: `listpeers` now includes a `pushed_msat` value. For leased channels, is the total lease_fee.

doc/lightning-listpeers.7.md

@@ -73,6 +73,7 @@ On success, an object containing **peers** is returned.  It is an array of objec
   - **funding** (object, optional):
     - **local_msat** (msat): Amount of channel we funded
     - **remote_msat** (msat): Amount of channel they funded
+    - **pushed_msat** (msat): Amount pushed from opener to peer
   - **to_us_msat** (msat, optional): how much of channel is owed to us
   - **min_to_us_msat** (msat, optional): least amount owed to us ever
   - **max_to_us_msat** (msat, optional): most amount owed to us ever
@@ -377,4 +378,4 @@ Main web site: <https://github.com/ElementsProject/lightning> Lightning
 RFC site (BOLT \#9):
 <https://github.com/lightningnetwork/lightning-rfc/blob/master/09-features.md>
 
-[comment]: # ( SHA256STAMP:d45de73a968bcc3e7fb699f0acd7a27a4c70d9e9fded8af8c684a71fe012f1ce)
+[comment]: # ( SHA256STAMP:001e3cf495571bb09fe29f74adde8a6e40e69ddb1169934924eaf901a1e5f3c0)

doc/schemas/listpeers.schema.json

@@ -342,7 +342,8 @@
                   "additionalProperties": false,
                   "required": [
                     "local_msat",
-                    "remote_msat"
+                    "remote_msat",
+                    "pushed_msat"
                   ],
                   "properties": {
                     "local_msat": {
@@ -352,6 +353,10 @@
                     "remote_msat": {
                       "type": "msat",
                       "description": "Amount of channel they funded"
+                    },
+                    "pushed_msat": {
+                      "type": "msat",
+                      "description": "Amount pushed from opener to peer"
                     }
                   }
                 },

lightningd/peer_control.c

@@ -791,6 +791,7 @@ static void json_add_channel(struct lightningd *ld,
 	json_object_start(response, "funding");
 	json_add_sat_only(response, "local_msat", channel->our_funds);
 	json_add_sat_only(response, "remote_msat", peer_funded_sats);
+	json_add_amount_msat_only(response, "pushed_msat", channel->push);
 	json_object_end(response);
 
 	if (!amount_sat_to_msat(&funding_msat, channel->funding_sats)) {