test: test feerate changes.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

daemon/jsonrpc.c

@@ -290,6 +290,7 @@ static const struct json_command *cmdlist[] = {
 	&newaddr_command,
 	&accept_payment_command,
 	&pay_command,
+	&feerate_command,
 	/* Developer/debugging options. */
 	&echo_command,
 	&rhash_command,

daemon/jsonrpc.h

@@ -74,4 +74,5 @@ extern const struct json_command accept_payment_command;
 extern const struct json_command add_route_command;
 extern const struct json_command routefail_command;
 extern const struct json_command pay_command;
+extern const struct json_command feerate_command;
 #endif /* LIGHTNING_DAEMON_JSONRPC_H */

daemon/peer.c

@@ -4537,6 +4537,35 @@ const struct json_command close_command = {
 	"Returns an empty result on success"
 };
 
+static void json_feerate(struct command *cmd,
+			 const char *buffer, const jsmntok_t *params)
+{
+	jsmntok_t *feeratetok;
+	u64 feerate;
+
+	if (!json_get_params(buffer, params,
+			     "feerate", &feeratetok,
+			     NULL)) {
+		command_fail(cmd, "Need feerate");
+		return;
+	}
+
+	if (!json_tok_u64(buffer, feeratetok, &feerate)) {
+		command_fail(cmd, "Invalid feerate");
+		return;
+	}
+	cmd->dstate->config.default_fee_rate = feerate;
+	
+	command_success(cmd, null_response(cmd));
+}
+
+const struct json_command feerate_command = {
+	"dev-feerate",
+	json_feerate,
+	"Change the (default) fee rate to {feerate}",
+	"Returns an empty result on success"
+};
+
 static void json_disconnect(struct command *cmd,
 			    const char *buffer, const jsmntok_t *params)
 {

daemon/test/test.sh

@@ -359,10 +359,10 @@ fi
 
 if [ -n "$DIFFERENT_FEES" ]; then
     # Simply override default fee (estimatefee fails on regtest anyway)
-    CLOSE_FEE_RATE2=50000
+    DEFAULT_FEE_RATE2=50000
     # We use 5x fee rate for commits, by defailt.
-    FEE_RATE2=$(($CLOSE_FEE_RATE2 * 5))
-    echo "default-fee-rate=$CLOSE_FEE_RATE2" >> $DIR2/config
+    FEE_RATE2=$(($DEFAULT_FEE_RATE2 * 5))
+    echo "default-fee-rate=$DEFAULT_FEE_RATE2" >> $DIR2/config
 fi
 
 # Need absolute path for re-exec testing.
@@ -513,6 +513,14 @@ if [ -n "$DIFFERENT_FEES" ]; then
     check_status_single lcli1 $(($AMOUNT - $HTLC_AMOUNT - $NO_HTLCS_FEE / 2)) $(($NO_HTLCS_FEE / 2)) "" $(($HTLC_AMOUNT - $NO_HTLCS_FEE / 2)) $(($NO_HTLCS_FEE / 2)) ""
     check_status_single lcli2 $(($HTLC_AMOUNT - $NO_HTLCS_FEE2 / 2)) $(($NO_HTLCS_FEE2 / 2)) "" $(($AMOUNT - $HTLC_AMOUNT - $NO_HTLCS_FEE2 / 2)) $(($NO_HTLCS_FEE2 / 2)) ""
 
+    # Change fee rate on node2 to same as node1.
+    lcli2 dev-feerate 40000
+    $CLI generate 1
+    [ ! -n "$MANUALCOMMIT" ] || lcli2 commit $ID1
+    [ ! -n "$MANUALCOMMIT" ] || lcli1 commit $ID2
+
+    check_status $(($AMOUNT - $HTLC_AMOUNT - $NO_HTLCS_FEE / 2)) $(($NO_HTLCS_FEE / 2)) "" $(($HTLC_AMOUNT - $NO_HTLCS_FEE / 2)) $(($NO_HTLCS_FEE / 2)) "" 
+
     lcli1 close $ID2
     # Make sure they notice it.
     check_peerstate lcli1 STATE_MUTUAL_CLOSING