[rpc] Add initialblockdownload to getblockchaininfo

Author: jnewbery

src/rpc/blockchain.cpp

@@ -1135,6 +1135,7 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
             "  \"difficulty\": xxxxxx,     (numeric) the current difficulty\n"
             "  \"mediantime\": xxxxxx,     (numeric) median time for the current best block\n"
             "  \"verificationprogress\": xxxx, (numeric) estimate of verification progress [0..1]\n"
+            "  \"initialblockdownload\": xxxx, (bool) (debug information) estimate of whether this node is in Initial Block Download mode.\n"
             "  \"chainwork\": \"xxxx\"     (string) total amount of work in active chain, in hexadecimal\n"
             "  \"size_on_disk\": xxxxxx,   (numeric) the estimated size of the block and undo files on disk\n"
             "  \"pruned\": xx,             (boolean) if the blocks are subject to pruning\n"
@@ -1183,6 +1184,7 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
     obj.push_back(Pair("difficulty",            (double)GetDifficulty()));
     obj.push_back(Pair("mediantime",            (int64_t)chainActive.Tip()->GetMedianTimePast()));
     obj.push_back(Pair("verificationprogress",  GuessVerificationProgress(Params().TxData(), chainActive.Tip())));
+    obj.push_back(Pair("initialblockdownload",  IsInitialBlockDownload()));
     obj.push_back(Pair("chainwork",             chainActive.Tip()->nChainWork.GetHex()));
     obj.push_back(Pair("size_on_disk",          CalculateCurrentUsage()));
     obj.push_back(Pair("pruned",                fPruneMode));

test/functional/blockchain.py

@@ -5,6 +5,7 @@
 """Test RPCs related to blockchainstate.
 
 Test the following RPCs:
+    - getblockchaininfo
     - gettxoutsetinfo
     - getdifficulty
     - getbestblockhash
@@ -58,6 +59,7 @@ def _test_getblockchaininfo(self):
             'chainwork',
             'difficulty',
             'headers',
+            'initialblockdownload',
             'mediantime',
             'pruned',
             'size_on_disk',