From 09c51e7f7dff9cb90436408640ff8e342e4495aa Mon Sep 17 00:00:00 2001
From: Jon Atack <jon@atack.com>
Date: Sun, 15 Nov 2020 16:15:11 +0100
Subject: [PATCH] policy: add CFeeRate::SatsToString helper without units

---
 src/policy/feerate.cpp    | 4 ++++
 src/policy/feerate.h      | 3 +++
 src/test/amount_tests.cpp | 8 ++++++++
 3 files changed, 15 insertions(+)

diff --git a/src/policy/feerate.cpp b/src/policy/feerate.cpp
index eb0cba5c67..34795a84fc 100644
--- a/src/policy/feerate.cpp
+++ b/src/policy/feerate.cpp
@@ -43,3 +43,7 @@ std::string CFeeRate::ToString(const FeeEstimateMode& fee_estimate_mode) const
     default:                      return strprintf("%d.%08d %s/kvB", nSatoshisPerK / COIN, nSatoshisPerK % COIN, CURRENCY_UNIT);
     }
 }
+
+std::string CFeeRate::SatsToString() const {
+    return strprintf("%d.%03d", nSatoshisPerK / 1000, nSatoshisPerK % 1000);
+}
diff --git a/src/policy/feerate.h b/src/policy/feerate.h
index 2e50172914..f11ac0225e 100644
--- a/src/policy/feerate.h
+++ b/src/policy/feerate.h
@@ -70,7 +70,10 @@ public:
     friend bool operator>=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK >= b.nSatoshisPerK; }
     friend bool operator!=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK != b.nSatoshisPerK; }
     CFeeRate& operator+=(const CFeeRate& a) { nSatoshisPerK += a.nSatoshisPerK; return *this; }
+    /** Return the fee rate in sat/vB or BTC/kvB, with units, as a string. */
     std::string ToString(const FeeEstimateMode& fee_estimate_mode = FeeEstimateMode::BTC_KVB) const;
+    /** Return the fee rate in sat/vB, without units, as a string. */
+    std::string SatsToString() const;
     friend CFeeRate operator*(const CFeeRate& f, int a) { return CFeeRate(a * f.nSatoshisPerK); }
     friend CFeeRate operator*(int a, const CFeeRate& f) { return CFeeRate(a * f.nSatoshisPerK); }
 
diff --git a/src/test/amount_tests.cpp b/src/test/amount_tests.cpp
index e5ab1cfb90..21d8b708ae 100644
--- a/src/test/amount_tests.cpp
+++ b/src/test/amount_tests.cpp
@@ -139,4 +139,12 @@ BOOST_AUTO_TEST_CASE(ToStringTest)
     BOOST_CHECK_EQUAL(feeRate.ToString(FeeEstimateMode::SAT_VB), "0.001 sat/vB");
 }
 
+BOOST_AUTO_TEST_CASE(SatsToStringTest)
+{
+    BOOST_CHECK_EQUAL(CFeeRate(1).SatsToString(), "0.001");
+    BOOST_CHECK_EQUAL(CFeeRate(70).SatsToString(), "0.070");
+    BOOST_CHECK_EQUAL(CFeeRate(3141).SatsToString(), "3.141");
+    BOOST_CHECK_EQUAL(CFeeRate(10002).SatsToString(), "10.002");
+}
+
 BOOST_AUTO_TEST_SUITE_END()