Boss/Mod/ChannelCreator/Manager.cpp: set {min|max} channel size

* Permit modification of ChannelCreator {min|max}_amount

* Change the minimum and maximum channel sizes CLBOSS will try to create
using `clboss-{min|max}-channel-size` flags with lightningd

Signed-off-by: willcl-ark <[email protected]>

Boss/Mod/ChannelCreator/Manager.cpp

@@ -5,6 +5,9 @@
 #include"Boss/Mod/ChannelCreator/RearrangerBySize.hpp"
 #include"Boss/Mod/Rpc.hpp"
 #include"Boss/Msg/Init.hpp"
+#include"Boss/Msg/ManifestOption.hpp"
+#include"Boss/Msg/Manifestation.hpp"
+#include"Boss/Msg/Option.hpp"
 #include"Boss/Msg/RequestChannelCreation.hpp"
 #include"Boss/Msg/SolicitChannelCandidates.hpp"
 #include"Boss/concurrent.hpp"
@@ -26,8 +29,8 @@
 namespace {
 
 /* Minimum and maximum channel size.  */
-auto const min_amount = Ln::Amount::btc(0.005);
-auto const max_amount = Ln::Amount::sat(16777215);
+auto min_amount = Ln::Amount::btc(0.005);
+auto max_amount = Ln::Amount::sat(16777215);
 /* If it is difficult to fit the amount among multiple
  * proposals, how much should we target leaving until
  * next time?
@@ -68,7 +71,63 @@ Ev::Io<void> report_proposals( S::Bus& bus, char const* prefix
 namespace Boss { namespace Mod { namespace ChannelCreator {
 
 void Manager::start() {
-	bus.subscribe<Msg::Init
+    Ln::Amount custom_min_amount;
+    Ln::Amount custom_max_amount;
+
+    bus.subscribe<Msg::Manifestation
+            >([this](Msg::Manifestation const& _) {
+        return bus.raise(Msg::ManifestOption{
+            "clboss-min-channel-size",
+            Msg::OptionType_Int,
+            Json::Out::direct(min_amount.to_sat()),
+            "Minimum channel size CLBOSS will create. "
+            "Set to an integer number of satoshis. "
+            "default=500000"
+        });
+    });
+
+    bus.subscribe<Msg::Option
+            >([this, &custom_min_amount](Msg::Option const& o) {
+        if (o.name != "clboss-min-channel-size")
+            return Ev::lift();
+        custom_min_amount = Ln::Amount::sat((double) o.value);
+        if (custom_min_amount != min_amount) {
+            min_amount = custom_min_amount;
+            return Boss::log( bus, Info
+                              , "ChannelCreator: "
+                                "set min-channel-size: %s."
+                                , std::string(custom_min_amount).c_str()
+                                );
+        }
+        return Ev::lift();
+    });
+    bus.subscribe<Msg::Manifestation
+    >([this](Msg::Manifestation const& _) {
+        return bus.raise(Msg::ManifestOption{
+                "clboss-max-channel-size",
+                Msg::OptionType_Int,
+                Json::Out::direct(min_amount.to_sat()),
+                "Maximum channel size CLBOSS will create. "
+                "Set to an integer number of satoshis. "
+                "default=16777215"
+        });
+    });
+    bus.subscribe<Msg::Option
+    >([this, &custom_max_amount](Msg::Option const& o) {
+        if (o.name != "clboss-max-channel-size")
+            return Ev::lift();
+        custom_max_amount = Ln::Amount::sat((double) o.value);
+        if (custom_max_amount != max_amount) {
+            max_amount = custom_max_amount;
+            return Boss::log( bus, Info
+                    , "ChannelCreator: "
+                      "set max-channel-size: %s."
+                    , std::string(custom_max_amount).c_str()
+            );
+        }
+        return Ev::lift();
+    });
+    bus.subscribe<Msg::Init
 		     >([this](Msg::Init const& init) {
 		rpc = &init.rpc;
 		self = init.self_id;

README.md

@@ -329,3 +329,28 @@ particular channels to particular nodes will not be auto-closed
 by CLBOSS (they may still be closed by `lightningd` due to an
 HTLC timeout, or by the peer for any reason, or by you; this
 just suppresses CLBOSS).
+
+### `--clboss-min-channel-size=<satoshis>`
+
+Pass this option to `lightningd` to configure the minimum
+channel size CLBOSS should consider creating.
+
+The amount specified must be an ordinary number, and must be
+in satoshis unit, without any trailing units or other strings.
+
+The default is "500000", or 0.005 BTC.
+
+### `--clboss-max-channel-size=<satoshis>`
+
+Pass this option to `lightningd` to configure the maximum
+channel size CLBOSS should consider creating.
+
+The amount specified must be an ordinary number, and must be
+in satoshis unit, without any trailing units or other strings.
+
+The default is "16777215", or 0.16777215 BTC.
+
+Anything larger than this default is considered a large (or
+"wumbo") channel.
+Using wumbo-sized channels will require passing `lightningd` 
+the `--large-channels|--wumbo` option.