From 1fafd704dac73594f69de5f9c15f697217653d7a Mon Sep 17 00:00:00 2001
From: Alex Morcos <morcos@chaincode.com>
Date: Wed, 28 Jun 2017 10:03:00 -0400
Subject: [PATCH] Add function to report highest estimate target tracked per
 horizon

---
 src/policy/fees.cpp | 20 +++++++++++++++++++-
 src/policy/fees.h   |  3 +++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index 859a2e7804..51e11ea20e 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -684,7 +684,7 @@ CFeeRate CBlockPolicyEstimator::estimateRawFee(int confTarget, double successThr
         break;
     }
     default: {
-        return CFeeRate(0);
+        throw std::out_of_range("CBlockPoicyEstimator::estimateRawFee unknown FeeEstimateHorizon");
     }
     }
 
@@ -703,6 +703,24 @@ CFeeRate CBlockPolicyEstimator::estimateRawFee(int confTarget, double successThr
     return CFeeRate(median);
 }
 
+unsigned int CBlockPolicyEstimator::HighestTargetTracked(FeeEstimateHorizon horizon) const
+{
+    switch (horizon) {
+    case FeeEstimateHorizon::SHORT_HALFLIFE: {
+        return shortStats->GetMaxConfirms();
+    }
+    case FeeEstimateHorizon::MED_HALFLIFE: {
+        return feeStats->GetMaxConfirms();
+    }
+    case FeeEstimateHorizon::LONG_HALFLIFE: {
+        return longStats->GetMaxConfirms();
+    }
+    default: {
+        throw std::out_of_range("CBlockPoicyEstimator::HighestTargetTracked unknown FeeEstimateHorizon");
+    }
+    }
+}
+
 unsigned int CBlockPolicyEstimator::BlockSpan() const
 {
     if (firstRecordedHeight == 0) return 0;
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 86f143b233..a04dbe4924 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -216,6 +216,9 @@ public:
     /** Empty mempool transactions on shutdown to record failure to confirm for txs still in mempool */
     void FlushUnconfirmed(CTxMemPool& pool);
 
+    /** Calculation of highest target that estimates are tracked for */
+    unsigned int HighestTargetTracked(FeeEstimateHorizon horizon) const;
+
 private:
     unsigned int nBestSeenHeight;
     unsigned int firstRecordedHeight;