[backport] [rpc] getblockchaininfo: add size_on_disk, prune_target_size, automatic_pruning

Fix pruneheight help text.
Move fPruneMode block to match output ordering with help text.
Add functional tests for new fields in getblockchaininfo.

Rebase-from: bitcoin#b7dfc6c4

1 files changed, 22 insertions, 10 deletions

diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 6d3264130..c80dd85fa 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -1147,8 +1147,11 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
             "  \"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"
-            "  \"pruneheight\": xxxxxx,    (numeric) lowest-height complete block stored\n"
+            "  \"pruneheight\": xxxxxx,    (numeric) lowest-height complete block stored (only present if pruning is enabled)\n"
+            "  \"automatic_pruning\": xx,  (boolean) whether automatic pruning is enabled (only present if pruning is enabled)\n"
+            "  \"prune_target_size\": xxxxxx,  (numeric) the target size used by pruning (only present if automatic pruning is enabled)\n"
             "  \"softforks\": [            (array) status of softforks in progress\n"
             "     {\n"
             "        \"id\": \"xxxx\",        (string) name of softfork\n"
@@ -1185,7 +1188,24 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
     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));
+    if (fPruneMode) {
+        CBlockIndex* block = chainActive.Tip();
+        assert(block);
+        while (block->pprev && (block->pprev->nStatus & BLOCK_HAVE_DATA)) {
+            block = block->pprev;
+        }
+
+        obj.push_back(Pair("pruneheight",        block->nHeight));
+
+        // if 0, execution bypasses the whole if block.
+        bool automatic_pruning = (GetArg("-prune", 0) != 1);
+        obj.push_back(Pair("automatic_pruning",  automatic_pruning));
+        if (automatic_pruning) {
+            obj.push_back(Pair("prune_target_size",  nPruneTarget));
+        }
+    }
 
     const Consensus::Params& consensusParams = Params().GetConsensus(0);
     CBlockIndex* tip = chainActive.Tip();
@@ -1198,15 +1218,7 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
     BIP9SoftForkDescPushBack(bip9_softforks, "segwit", consensusParams, Consensus::DEPLOYMENT_SEGWIT);
     obj.push_back(Pair("softforks",             softforks));
     obj.push_back(Pair("bip9_softforks", bip9_softforks));
-
-    if (fPruneMode)
-    {
-        CBlockIndex *block = chainActive.Tip();
-        while (block && block->pprev && (block->pprev->nStatus & BLOCK_HAVE_DATA))
-            block = block->pprev;
-
-        obj.push_back(Pair("pruneheight",        block->nHeight));
-    }
+    obj.push_back(Pair("warnings", GetWarnings("statusbar")));
     return obj;
 }