From 2b431b171b4f15df02e646a66468ff4ece6716eb Mon Sep 17 00:00:00 2001
From: Glenn Willen <gwillen@nerdnet.org>
Date: Sat, 5 Nov 2016 23:46:58 -0700
Subject: [PATCH] config: Allow overriding the transaction fee rate

---
 daemon/chaintopology.c | 7 ++++++-
 daemon/lightningd.c    | 9 +++++++++
 daemon/lightningd.h    | 5 ++++-
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/daemon/chaintopology.c b/daemon/chaintopology.c
index 684d362de..880832994 100644
--- a/daemon/chaintopology.c
+++ b/daemon/chaintopology.c
@@ -485,7 +485,12 @@ u32 get_block_height(struct lightningd_state *dstate)
 
 u64 get_feerate(struct lightningd_state *dstate)
 {
-	if (dstate->topology->feerate == 0) {
+	if (dstate->config.override_fee_rate) {
+		log_debug(dstate->base_log,
+			"Forcing fee rate, ignoring estimate");
+		return dstate->config.override_fee_rate;
+	}
+	else if (dstate->topology->feerate == 0) {
 		log_info(dstate->base_log,
 			 "No fee estimate: using default fee rate");
 		return dstate->config.default_fee_rate;
diff --git a/daemon/lightningd.c b/daemon/lightningd.c
index 0993ca471..17390b9d6 100644
--- a/daemon/lightningd.c
+++ b/daemon/lightningd.c
@@ -127,6 +127,9 @@ static void config_register_opts(struct lightningd_state *dstate)
 	opt_register_arg("--commit-fee=<percent>", opt_set_u32, opt_show_u32,
 			 &dstate->config.commitment_fee_percent,
 			 "Percentage of fee to request for their commitment");
+	opt_register_arg("--override-fee-rate", opt_set_u64, opt_show_u64,
+			 &dstate->config.override_fee_rate,
+			 "Force a specific rate in satoshis per kb regardless of estimated fees");
 	opt_register_arg("--default-fee-rate", opt_set_u64, opt_show_u64,
 			 &dstate->config.default_fee_rate,
 			 "Satoshis per kb if can't estimate fees");
@@ -198,6 +201,9 @@ static const struct config testnet_config = {
 	/* We offer to pay 5 times 2-block fee */
 	.commitment_fee_percent = 500,
 
+	/* Use this rate, if specified, regardless of what estimatefee says. */
+	.override_fee_rate = 0,
+
 	/* Use this rate by default if estimatefee doesn't estimate. */
 	.default_fee_rate = 40000,
 
@@ -256,6 +262,9 @@ static const struct config mainnet_config = {
 	/* We offer to pay 5 times 2-block fee */
 	.commitment_fee_percent = 500,
 
+	/* Use this rate, if specified, regardless of what estimatefee says. */
+	.override_fee_rate = 0,
+
 	/* Use this rate by default if estimatefee doesn't estimate. */
 	.default_fee_rate = 40000,
 
diff --git a/daemon/lightningd.h b/daemon/lightningd.h
index d5a5b8780..b81cfbd1f 100644
--- a/daemon/lightningd.h
+++ b/daemon/lightningd.h
@@ -37,7 +37,10 @@ struct config {
 
 	/* Percent of fee rate we'll use. */
 	u32 commitment_fee_percent;
-	
+
+	/* Force a partiular fee rate regardless of estimatefee (satoshis/kb) */
+	u64 override_fee_rate;
+
 	/* What fee we use if estimatefee fails (satoshis/kb) */
 	u64 default_fee_rate;