looprpc: add SwapPublicationDeadline to client proto

cmd/loopd swapclient_server: use SwapPublicationDeadline from LoopOutRequest

Author: halseth

cmd/loopd/swapclient_server.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"sort"
+	"time"
 
 	"github.com/lightningnetwork/lnd/queue"
 
@@ -76,6 +77,9 @@ func (s *swapClientServer) LoopOut(ctx context.Context,
 		MaxSwapRoutingFee:   btcutil.Amount(in.MaxSwapRoutingFee),
 		MaxSwapFee:          btcutil.Amount(in.MaxSwapFee),
 		SweepConfTarget:     sweepConfTarget,
+		SwapPublicationDeadline: time.Unix(
+			int64(in.SwapPublicationDeadline), 0,
+		),
 	}
 	if in.LoopOutChannel != 0 {
 		req.LoopOutChannel = &in.LoopOutChannel

looprpc/client.pb.go

@@ -146,6 +146,15 @@ message LoopOutRequest {
     should be swept within.
     */
     int32 sweep_conf_target = 9;
+
+    /**
+    The latest time (in unix seconds) we allow the server to wait before
+    publishing the HTLC on chain. Setting this to a larger value will give the
+    server the opportunity to batch multiple swaps together, and wait for
+    low-fee periods before publishing the HTLC, potentially resulting in a
+    lower total swap fee.
+    */
+    uint64 swap_publication_deadline = 10;
 }
 
 message LoopInRequest {

looprpc/client.proto

@@ -265,6 +265,11 @@
           "type": "integer",
           "format": "int32",
           "description": "*\nThe number of blocks from the on-chain HTLC's confirmation height that it\nshould be swept within."
+        },
+        "swap_publication_deadline": {
+          "type": "string",
+          "format": "uint64",
+          "description": "*\nThe latest time (in unix seconds) we allow the server to wait before\npublishing the HTLC on chain. Setting this to a larger value will give the\nserver the opportunity to batch multiple swaps together, and wait for\nlow-fee periods before publishing the HTLC, potentially resulting in a\nlower total swap fee."
         }
       }
     },