More option cleanups.

Because we have too many which are never used and I don't want to document
them.

1. Remove unused anchor_onchain_wait.  When implemented, it should be
   hardcoded to 100 or more.
2. Remove anchor_confirms_max.  10 always reasonable, and we can readd
   an override option should someone need it.
3. max_htlc_expiry should be the same as locktime_max (which increases
   from 3 to 5 days by default): they're both a limit on how long
   funds can be locked up.
4. channel_update_interval should always be a dev option.

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

lightningd/lightningd.h

@@ -20,15 +20,9 @@ struct config {
 	/* How long do we let them lock up our funds? (blocks) */
 	u32 locktime_max;
 
-	/* How many blocks before we expect to see anchor?. */
-	u32 anchor_onchain_wait;
-
 	/* How many confirms until we consider an anchor "settled". */
 	u32 anchor_confirms;
 
-	/* How long will we accept them waiting? */
-	u32 anchor_confirms_max;
-
 	/* Maximum percent of fee rate we'll accept. */
 	u32 commitment_fee_max_percent;
 
@@ -44,9 +38,6 @@ struct config {
 	/* Minimum CLTV if we're the final hop.*/
 	u32 cltv_final;
 
-	/* Maximum time for an expiring HTLC (blocks). */
-	u32 max_htlc_expiry;
-
 	/* Fee rates. */
 	u32 fee_base;
 	s32 fee_per_satoshi;

lightningd/opening_control.c

@@ -624,12 +624,10 @@ new_uncommitted_channel(struct lightningd *ld,
 static void channel_config(struct lightningd *ld,
 			   struct channel_config *ours,
 			   u32 *max_to_self_delay,
-			   u32 *max_minimum_depth,
 			   u64 *min_effective_htlc_capacity_msat)
 {
 	/* FIXME: depend on feerate. */
 	*max_to_self_delay = ld->config.locktime_max;
-	*max_minimum_depth = ld->config.anchor_confirms_max;
 	/* This is 1c at $1000/BTC */
 	*min_effective_htlc_capacity_msat = 1000000;
 
@@ -678,7 +676,7 @@ u8 *peer_accept_channel(const tal_t *ctx,
 			const struct channel_id *channel_id,
 			const u8 *open_msg)
 {
-	u32 max_to_self_delay, max_minimum_depth;
+	u32 max_to_self_delay;
 	u64 min_effective_htlc_capacity_msat;
 	u8 *msg;
 	struct uncommitted_channel *uc;
@@ -723,7 +721,7 @@ u8 *peer_accept_channel(const tal_t *ctx,
 	uc->minimum_depth = ld->config.anchor_confirms;
 
 	channel_config(ld, &uc->our_config,
-		       &max_to_self_delay, &max_minimum_depth,
+		       &max_to_self_delay,
 		       &min_effective_htlc_capacity_msat);
 
 	msg = towire_opening_init(uc, get_chainparams(ld)->index,
@@ -751,7 +749,7 @@ static void peer_offer_channel(struct lightningd *ld,
 			       int peer_fd, int gossip_fd)
 {
 	u8 *msg;
-	u32 max_to_self_delay, max_minimum_depth;
+	u32 max_to_self_delay;
 	u64 min_effective_htlc_capacity_msat;
 
 	/* Remove from list, it's not pending any more. */
@@ -793,7 +791,7 @@ static void peer_offer_channel(struct lightningd *ld,
 	}
 
 	channel_config(ld, &fc->uc->our_config,
-		       &max_to_self_delay, &max_minimum_depth,
+		       &max_to_self_delay,
 		       &min_effective_htlc_capacity_msat);
 
 	msg = towire_opening_init(fc,
@@ -807,7 +805,6 @@ static void peer_offer_channel(struct lightningd *ld,
 	msg = towire_opening_funder(fc, fc->wtx.amount,
 				    fc->push_msat,
 				    get_feerate(ld->topology, FEERATE_NORMAL),
-				    max_minimum_depth,
 				    fc->wtx.change, fc->wtx.change_key_index,
 				    fc->channel_flags,
 				    fc->wtx.utxos,

lightningd/options.c

@@ -304,15 +304,9 @@ static void config_register_opts(struct lightningd *ld)
 	opt_register_arg("--max-locktime-blocks", opt_set_u32, opt_show_u32,
 			 &ld->config.locktime_max,
 			 "Maximum blocks a peer can lock up our funds");
-	opt_register_arg("--anchor-onchain", opt_set_u32, opt_show_u32,
-			 &ld->config.anchor_onchain_wait,
-			 "Blocks before we give up on pending anchor transaction");
 	opt_register_arg("--anchor-confirms", opt_set_u32, opt_show_u32,
 			 &ld->config.anchor_confirms,
 			 "Confirmations required for anchor transaction");
-	opt_register_arg("--max-anchor-confirms", opt_set_u32, opt_show_u32,
-			 &ld->config.anchor_confirms_max,
-			 "Maximum confirmations other side can wait for anchor transaction");
 	opt_register_arg("--commit-fee-min=<percent>", opt_set_u32, opt_show_u32,
 			 &ld->config.commitment_fee_min_percent,
 			 "Minimum percentage of fee to accept for commitment");
@@ -331,9 +325,6 @@ static void config_register_opts(struct lightningd *ld)
 	opt_register_arg("--cltv-final", opt_set_u32, opt_show_u32,
 			 &ld->config.cltv_final,
 			 "Number of blocks for final ctlv_expiry");
-	opt_register_arg("--max-htlc-expiry", opt_set_u32, opt_show_u32,
-			 &ld->config.max_htlc_expiry,
-			 "Maximum number of blocks to accept an HTLC before expiry");
 	opt_register_arg("--commit-time", opt_set_time, opt_show_time,
 			 &ld->config.commit_time,
 			 "Time after changes before sending out COMMIT");
@@ -447,6 +438,11 @@ static void dev_register_opts(struct lightningd *ld)
 	opt_register_arg("--dev-override-fee-rates", opt_set_fee_rates, NULL,
 			 ld->topology,
 			 "Force a specific rates (immediate/normal/slow) in satoshis per kw regardless of estimated fees");
+
+	opt_register_arg(
+	    "--dev-channel-update-interval=<s>", opt_set_u32, opt_show_u32,
+	    &ld->config.channel_update_interval,
+	    "Time in seconds between channel updates for our own channels.");
 }
 #endif
 
@@ -454,18 +450,12 @@ static const struct config testnet_config = {
 	/* 6 blocks to catch cheating attempts. */
 	.locktime_blocks = 6,
 
-	/* They can have up to 3 days. */
-	.locktime_max = 3 * 6 * 24,
-
-	/* Testnet can have long runs of empty blocks. */
-	.anchor_onchain_wait = 100,
+	/* They can have up to 5 days. */
+	.locktime_max = 5 * 6 * 24,
 
 	/* We're fairly trusting, under normal circumstances. */
 	.anchor_confirms = 1,
 
-	/* More than 10 confirms seems overkill. */
-	.anchor_confirms_max = 10,
-
 	/* Testnet fees are crazy, allow infinite feerange. */
 	.commitment_fee_min_percent = 0,
 	.commitment_fee_max_percent = 0,
@@ -477,9 +467,6 @@ static const struct config testnet_config = {
 	.cltv_expiry_delta = 6,
 	.cltv_final = 6,
 
-	/* Don't lock up channel for more than 5 days. */
-	.max_htlc_expiry = 5 * 6 * 24,
-
 	/* Send commit 10msec after receiving; almost immediately. */
 	.commit_time = TIME_FROM_MSEC(10),
 
@@ -507,18 +494,12 @@ static const struct config mainnet_config = {
 	/* ~one day to catch cheating attempts. */
 	.locktime_blocks = 6 * 24,
 
-	/* They can have up to 3 days. */
-	.locktime_max = 3 * 6 * 24,
-
-	/* You should get in within 10 blocks. */
-	.anchor_onchain_wait = 10,
+	/* They can have up to 5 days. */
+	.locktime_max = 5 * 6 * 24,
 
 	/* We're fairly trusting, under normal circumstances. */
 	.anchor_confirms = 3,
 
-	/* More than 10 confirms seems overkill. */
-	.anchor_confirms_max = 10,
-
 	/* Insist between 2 and 20 times the 2-block fee. */
 	.commitment_fee_min_percent = 200,
 	.commitment_fee_max_percent = 2000,
@@ -538,9 +519,6 @@ static const struct config mainnet_config = {
 	 * worst case for the terminal node C lower at `2R+G+S` blocks */
 	.cltv_final = 8,
 
-	/* Don't lock up channel for more than 5 days. */
-	.max_htlc_expiry = 5 * 6 * 24,
-
 	/* Send commit 10msec after receiving; almost immediately. */
 	.commit_time = TIME_FROM_MSEC(10),
 
@@ -739,11 +717,6 @@ void register_opts(struct lightningd *ld)
 			 &ld->pidfile,
 			 "Specify pid file");
 
-	opt_register_arg(
-	    "--channel-update-interval=<s>", opt_set_u32, opt_show_u32,
-	    &ld->config.channel_update_interval,
-	    "Time in seconds between channel updates for our own channels.");
-
 	opt_register_logging(ld);
 	opt_register_version();
 

lightningd/peer_htlcs.c

@@ -490,12 +490,12 @@ static void forward_htlc(struct htlc_in *hin,
 	 * 1. type: 21 (`expiry_too_far`)
 	 */
 	if (get_block_height(ld->topology)
-	    + ld->config.max_htlc_expiry < outgoing_cltv_value) {
+	    + ld->config.locktime_max < outgoing_cltv_value) {
 		log_debug(hin->key.channel->log,
 			  "Expiry cltv %u too far from current %u + max %u",
 			  outgoing_cltv_value,
 			  get_block_height(ld->topology),
-			  ld->config.max_htlc_expiry);
+			  ld->config.locktime_max);
 		failcode = WIRE_EXPIRY_TOO_FAR;
 		goto fail;
 	}

openingd/opening.c

@@ -242,7 +242,6 @@ static u8 *opening_read_peer_msg(struct state *state)
 static u8 *funder_channel(struct state *state,
 			  const struct pubkey *our_funding_pubkey,
 			  const struct basepoints *ours,
-			  u32 max_minimum_depth,
 			  u64 change_satoshis, u32 change_keyindex,
 			  u8 channel_flags,
 			  struct utxo **utxos,
@@ -352,10 +351,10 @@ static u8 *funder_channel(struct state *state,
 	 * Other fields have the same requirements as their counterparts in
 	 * `open_channel`.
 	 */
-	if (minimum_depth > max_minimum_depth)
+	if (minimum_depth > 10)
 		negotiation_failed(state,
 				   "minimum_depth %u larger than %u",
-				   minimum_depth, max_minimum_depth);
+				   minimum_depth, 10);
 
 	/* BOLT #2:
 	 *
@@ -800,7 +799,7 @@ int main(int argc, char *argv[])
 	struct privkey seed;
 	struct basepoints our_points;
 	struct pubkey our_funding_pubkey;
-	u32 minimum_depth, max_minimum_depth;
+	u32 minimum_depth;
 	u32 min_feerate, max_feerate;
 	u64 change_satoshis;
 	u32 change_keyindex;
@@ -849,11 +848,11 @@ int main(int argc, char *argv[])
 	if (fromwire_opening_funder(state, msg,
 				    &state->funding_satoshis,
 				    &state->push_msat,
-				    &state->feerate_per_kw, &max_minimum_depth,
+				    &state->feerate_per_kw,
 				    &change_satoshis, &change_keyindex,
 				    &channel_flags, &utxos, &bip32_base)) {
 		msg = funder_channel(state, &our_funding_pubkey, &our_points,
-				     max_minimum_depth, change_satoshis,
+				     change_satoshis,
 				     change_keyindex, channel_flags,
 				     utxos, &bip32_base);
 		peer_billboard(false,

openingd/opening_wire.csv

@@ -19,7 +19,6 @@ opening_funder,6001
 opening_funder,,funding_satoshis,u64
 opening_funder,,push_msat,u64
 opening_funder,,feerate_per_kw,u32
-opening_funder,,max_minimum_depth,u32
 opening_funder,,change_satoshis,u64
 opening_funder,,change_keyindex,u32
 opening_funder,,channel_flags,u8

tests/test_gossip.py

@@ -9,11 +9,11 @@ import unittest
 DEVELOPER = os.getenv("DEVELOPER", "0") == "1"
 
 
-@unittest.skipIf(not DEVELOPER, "needs DEVELOPER=1 for --dev-broadcast-interval")
+@unittest.skipIf(not DEVELOPER, "needs --dev-broadcast-interval, --dev-channelupdate-interval")
 def test_gossip_pruning(node_factory, bitcoind):
     """ Create channel and see it being updated in time before pruning
     """
-    opts = {'channel-update-interval': 5}
+    opts = {'dev-channel-update-interval': 5}
     l1, l2, l3 = node_factory.get_nodes(3, opts)
 
     l1.rpc.connect(l2.info['id'], 'localhost', l2.port)

tests/test_lightningd.py

@@ -3623,7 +3623,7 @@ class LightningDTests(BaseLightningDTests):
         """Add some funds, fund a channel without enough funds"""
         # Previous runs with same bitcoind can leave funds!
         l1 = self.node_factory.get_node(random_hsm=True)
-        max_locktime = 3 * 6 * 24
+        max_locktime = 5 * 6 * 24
         l2 = self.node_factory.get_node(options={'locktime-blocks': max_locktime + 1})
         l1.rpc.connect(l2.info['id'], 'localhost', l2.port)