Change API to estimaterawfee

Report results for all 3 possible time horizons instead of specifying time horizon as an argument.

src/policy/feerate.h

@@ -40,6 +40,7 @@ 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; }
     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; }
     std::string ToString() const;
 

src/policy/fees.cpp

@@ -16,6 +16,19 @@
 
 static constexpr double INF_FEERATE = 1e99;
 
+std::string StringForFeeEstimateHorizon(FeeEstimateHorizon horizon) {
+    static const std::map<FeeEstimateHorizon, std::string> horizon_strings = {
+        {FeeEstimateHorizon::SHORT_HALFLIFE, "short"},
+        {FeeEstimateHorizon::MED_HALFLIFE, "medium"},
+        {FeeEstimateHorizon::LONG_HALFLIFE, "long"},
+    };
+    auto horizon_string = horizon_strings.find(horizon);
+
+    if (horizon_string == horizon_strings.end()) return "unknown";
+
+    return horizon_string->second;
+}
+
 std::string StringForFeeReason(FeeReason reason) {
     static const std::map<FeeReason, std::string> fee_reason_strings = {
         {FeeReason::NONE, "None"},

src/policy/fees.h

@@ -74,6 +74,8 @@ enum FeeEstimateHorizon {
     LONG_HALFLIFE = 2
 };
 
+std::string StringForFeeEstimateHorizon(FeeEstimateHorizon horizon);
+
 /* Enumeration of reason for returned fee estimate */
 enum class FeeReason {
     NONE,

src/rpc/client.cpp

@@ -113,7 +113,6 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "estimatesmartfee", 1, "conservative" },
     { "estimaterawfee", 0, "nblocks" },
     { "estimaterawfee", 1, "threshold" },
-    { "estimaterawfee", 2, "horizon" },
     { "prioritisetransaction", 1, "dummy" },
     { "prioritisetransaction", 2, "fee_delta" },
     { "setban", 2, "bantime" },

src/rpc/mining.cpp

@@ -838,9 +838,9 @@ UniValue estimatesmartfee(const JSONRPCRequest& request)
 
 UniValue estimaterawfee(const JSONRPCRequest& request)
 {
-    if (request.fHelp || request.params.size() < 1|| request.params.size() > 3)
+    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
         throw std::runtime_error(
-            "estimaterawfee nblocks (threshold horizon)\n"
+            "estimaterawfee nblocks (threshold)\n"
             "\nWARNING: This interface is unstable and may disappear or change!\n"
             "\nWARNING: This is an advanced API call that is tightly coupled to the specific\n"
             "         implementation of fee estimation. The parameters it can be called with\n"
@@ -853,10 +853,9 @@ UniValue estimaterawfee(const JSONRPCRequest& request)
             "2. threshold   (numeric, optional) The proportion of transactions in a given feerate range that must have been\n"
             "               confirmed within nblocks in order to consider those feerates as high enough and proceed to check\n"
             "               lower buckets.  Default: 0.95\n"
-            "3. horizon     (numeric, optional) How long a history of estimates to consider. 0=short, 1=medium, 2=long.\n"
-            "               Default: 1\n"
             "\nResult:\n"
             "{\n"
+            "  \"short\" : {            (json object) estimate for short time horizon\n"
             "      \"feerate\" : x.x,        (numeric) estimate fee-per-kilobyte (in BTC)\n"
             "      \"decay\" : x.x,          (numeric) exponential decay (per block) for historical moving average of confirmation data\n"
             "      \"scale\" : x,            (numeric) The resolution of confirmation targets at this time horizon\n"
@@ -867,38 +866,38 @@ UniValue estimaterawfee(const JSONRPCRequest& request)
             "          \"totalconfirmed\" : x.x, (numeric) number of txs over history horizon in the feerate range that were confirmed at any point\n"
             "          \"inmempool\" : x.x,      (numeric) current number of txs in mempool in the feerate range unconfirmed for at least target blocks\n"
             "          \"leftmempool\" : x.x,    (numeric) number of txs over history horizon in the feerate range that left mempool unconfirmed after target\n"
-            "  }\n"
-            "  \"fail\" : { ... }        (json object) information about the highest range of feerates to fail to meet the threshold\n"
+            "      },\n"
+            "      \"fail\" : { ... },        (json object) information about the highest range of feerates to fail to meet the threshold\n"
+            "  },\n"
+            "  \"medium\" : { ... },      (json object) estimate for medium time horizon\n"
+            "  \"long\" : { ... }      (json object) estimate for long time horizon\n"
             "}\n"
             "\n"
             "A negative feerate is returned if no answer can be given.\n"
             "\nExample:\n"
-            + HelpExampleCli("estimaterawfee", "6 0.9 1")
+            + HelpExampleCli("estimaterawfee", "6 0.9")
             );
 
     RPCTypeCheck(request.params, {UniValue::VNUM, UniValue::VNUM, UniValue::VNUM}, true);
     RPCTypeCheckArgument(request.params[0], UniValue::VNUM);
     int nBlocks = request.params[0].get_int();
     double threshold = 0.95;
-    if (!request.params[1].isNull())
+    if (!request.params[1].isNull()) {
         threshold = request.params[1].get_real();
-    FeeEstimateHorizon horizon = FeeEstimateHorizon::MED_HALFLIFE;
-    if (!request.params[2].isNull()) {
-        int horizonInt = request.params[2].get_int();
-        if (horizonInt < 0 || horizonInt > 2) {
-            throw JSONRPCError(RPC_TYPE_ERROR, "Invalid horizon for fee estimates");
-        } else {
-            horizon = (FeeEstimateHorizon)horizonInt;
-        }
     }
+
     UniValue result(UniValue::VOBJ);
+
+    for (FeeEstimateHorizon horizon : {FeeEstimateHorizon::SHORT_HALFLIFE, FeeEstimateHorizon::MED_HALFLIFE, FeeEstimateHorizon::LONG_HALFLIFE}) {
         CFeeRate feeRate;
         EstimationResult buckets;
         feeRate = ::feeEstimator.estimateRawFee(nBlocks, threshold, horizon, &buckets);
 
-    result.push_back(Pair("feerate", feeRate == CFeeRate(0) ? -1.0 : ValueFromAmount(feeRate.GetFeePerK())));
-    result.push_back(Pair("decay", buckets.decay));
-    result.push_back(Pair("scale", (int)buckets.scale));
+        UniValue horizon_result(UniValue::VOBJ);
+        horizon_result.push_back(Pair("feerate", feeRate == CFeeRate(0) ? -1.0 : ValueFromAmount(feeRate.GetFeePerK())));
+        if (!(feeRate == CFeeRate(0))) {
+            horizon_result.push_back(Pair("decay", buckets.decay));
+            horizon_result.push_back(Pair("scale", (int)buckets.scale));
             UniValue passbucket(UniValue::VOBJ);
             passbucket.push_back(Pair("startrange", round(buckets.pass.start)));
             passbucket.push_back(Pair("endrange", round(buckets.pass.end)));
@@ -906,7 +905,7 @@ UniValue estimaterawfee(const JSONRPCRequest& request)
             passbucket.push_back(Pair("totalconfirmed", round(buckets.pass.totalConfirmed * 100.0) / 100.0));
             passbucket.push_back(Pair("inmempool", round(buckets.pass.inMempool * 100.0) / 100.0));
             passbucket.push_back(Pair("leftmempool", round(buckets.pass.leftMempool * 100.0) / 100.0));
-    result.push_back(Pair("pass", passbucket));
+            horizon_result.push_back(Pair("pass", passbucket));
             UniValue failbucket(UniValue::VOBJ);
             failbucket.push_back(Pair("startrange", round(buckets.fail.start)));
             failbucket.push_back(Pair("endrange", round(buckets.fail.end)));
@@ -914,7 +913,10 @@ UniValue estimaterawfee(const JSONRPCRequest& request)
             failbucket.push_back(Pair("totalconfirmed", round(buckets.fail.totalConfirmed * 100.0) / 100.0));
             failbucket.push_back(Pair("inmempool", round(buckets.fail.inMempool * 100.0) / 100.0));
             failbucket.push_back(Pair("leftmempool", round(buckets.fail.leftMempool * 100.0) / 100.0));
-    result.push_back(Pair("fail", failbucket));
+            horizon_result.push_back(Pair("fail", failbucket));
+        }
+        result.push_back(Pair(StringForFeeEstimateHorizon(horizon), horizon_result));
+    }
     return result;
 }
 
@@ -932,7 +934,7 @@ static const CRPCCommand commands[] =
     { "util",               "estimatefee",            &estimatefee,            true,  {"nblocks"} },
     { "util",               "estimatesmartfee",       &estimatesmartfee,       true,  {"nblocks", "conservative"} },
 
-    { "hidden",             "estimaterawfee",         &estimaterawfee,         true,  {"nblocks", "threshold", "horizon"} },
+    { "hidden",             "estimaterawfee",         &estimaterawfee,         true,  {"nblocks", "threshold"} },
 };
 
 void RegisterMiningRPCCommands(CRPCTable &t)