From d23f6c6a0d2dc8a3f5f159faf7a40157259a8f8f Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Thu, 3 Mar 2016 21:00:03 +0100
Subject: [PATCH] Softfork status report in RPC

---
 src/main.cpp           |  6 +++++-
 src/main.h             |  4 ++++
 src/rpc/blockchain.cpp | 22 ++++++++++++++++++++++
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/main.cpp b/src/main.cpp
index 45e588189..e4567a897 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5859,7 +5859,11 @@ bool SendMessages(CNode* pto)
      return strprintf("CBlockFileInfo(blocks=%u, size=%u, heights=%u...%u, time=%s...%s)", nBlocks, nSize, nHeightFirst, nHeightLast, DateTimeStrFormat("%Y-%m-%d", nTimeFirst), DateTimeStrFormat("%Y-%m-%d", nTimeLast));
  }
 
-
+ThresholdState VersionBitsTipState(const Consensus::Params& params, Consensus::DeploymentPos pos)
+{
+    LOCK(cs_main);
+    return VersionBitsState(chainActive.Tip(), params, pos, versionbitscache);
+}
 
 class CMainCleanup
 {
diff --git a/src/main.h b/src/main.h
index 7670bb74d..b66ad53c8 100644
--- a/src/main.h
+++ b/src/main.h
@@ -16,6 +16,7 @@
 #include "net.h"
 #include "script/script_error.h"
 #include "sync.h"
+#include "versionbits.h"
 
 #include <algorithm>
 #include <exception>
@@ -289,6 +290,9 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
 /** Convert CValidationState to a human-readable message for logging */
 std::string FormatStateMessage(const CValidationState &state);
 
+/** Get the BIP9 state for a given deployment at the current tip. */
+ThresholdState VersionBitsTipState(const Consensus::Params& params, Consensus::DeploymentPos pos);
+
 struct CNodeStateStats {
     int nMisbehavior;
     int nSyncHeight;
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index da57973da..a110dff0d 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -604,6 +604,20 @@ static UniValue SoftForkDesc(const std::string &name, int version, CBlockIndex*
     return rv;
 }
 
+static UniValue BIP9SoftForkDesc(const std::string& name, const Consensus::Params& consensusParams, Consensus::DeploymentPos id)
+{
+    UniValue rv(UniValue::VOBJ);
+    rv.push_back(Pair("id", name));
+    switch (VersionBitsTipState(consensusParams, id)) {
+    case THRESHOLD_DEFINED: rv.push_back(Pair("status", "defined")); break;
+    case THRESHOLD_STARTED: rv.push_back(Pair("status", "started")); break;
+    case THRESHOLD_LOCKED_IN: rv.push_back(Pair("status", "locked_in")); break;
+    case THRESHOLD_ACTIVE: rv.push_back(Pair("status", "active")); break;
+    case THRESHOLD_FAILED: rv.push_back(Pair("status", "failed")); break;
+    }
+    return rv;
+}
+
 UniValue getblockchaininfo(const UniValue& params, bool fHelp)
 {
     if (fHelp || params.size() != 0)
@@ -634,6 +648,12 @@ UniValue getblockchaininfo(const UniValue& params, bool fHelp)
             "        },\n"
             "        \"reject\": { ... }      (object) progress toward rejecting pre-softfork blocks (same fields as \"enforce\")\n"
             "     }, ...\n"
+            "  ],\n"
+            "  \"bip9_softforks\": [       (array) status of BIP9 softforks in progress\n"
+            "     {\n"
+            "        \"id\": \"xxxx\",        (string) name of the softfork\n"
+            "        \"status\": \"xxxx\",    (string) one of \"defined\", \"started\", \"lockedin\", \"active\", \"failed\"\n"
+            "     }\n"
             "  ]\n"
             "}\n"
             "\nExamples:\n"
@@ -657,10 +677,12 @@ UniValue getblockchaininfo(const UniValue& params, bool fHelp)
     const Consensus::Params& consensusParams = Params().GetConsensus();
     CBlockIndex* tip = chainActive.Tip();
     UniValue softforks(UniValue::VARR);
+    UniValue bip9_softforks(UniValue::VARR);
     softforks.push_back(SoftForkDesc("bip34", 2, tip, consensusParams));
     softforks.push_back(SoftForkDesc("bip66", 3, tip, consensusParams));
     softforks.push_back(SoftForkDesc("bip65", 4, tip, consensusParams));
     obj.push_back(Pair("softforks",             softforks));
+    obj.push_back(Pair("bip9_softforks", bip9_softforks));
 
     if (fPruneMode)
     {