From 1fc4ec7bf224748d3d6271bffa23d121f015cbf3 Mon Sep 17 00:00:00 2001
From: mrbandrews <bandrewsny@gmail.com>
Date: Tue, 29 Nov 2016 12:39:19 -0500
Subject: Add pruneblockchain RPC to enable manual block file pruning.

---
 src/rpc/blockchain.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'src/rpc/blockchain.cpp')

diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 0b42c1d625..f49a333279 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -814,6 +814,36 @@ static bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
     return true;
 }
 
+UniValue pruneblockchain(const JSONRPCRequest& request)
+{
+    if (request.fHelp || request.params.size() != 1)
+        throw runtime_error(
+            "pruneblockchain\n"
+            "\nArguments:\n"
+            "1. \"height\"       (int, required) The block height to prune up to.\n");
+
+    if (!fPruneMode)
+        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Cannot prune blocks because node is not in prune mode.");
+
+    LOCK(cs_main);
+
+    int heightParam = request.params[0].get_int();
+    if (heightParam < 0)
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Negative block height.");
+
+    unsigned int height = (unsigned int) heightParam;
+    unsigned int chainHeight = (unsigned int) chainActive.Height();
+    if (chainHeight < Params().PruneAfterHeight())
+        throw JSONRPCError(RPC_INTERNAL_ERROR, "Blockchain is too short for pruning.");
+    else if (height > chainHeight)
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Blockchain is shorter than the attempted prune height.");
+    else if (height > chainHeight - MIN_BLOCKS_TO_KEEP)
+        LogPrint("rpc", "Attempt to prune blocks close to the tip.  Retaining the minimum number of blocks.");
+
+    PruneBlockFilesManual(height);
+    return NullUniValue;
+}
+
 UniValue gettxoutsetinfo(const JSONRPCRequest& request)
 {
     if (request.fHelp || request.params.size() != 0)
@@ -1384,6 +1414,7 @@ static const CRPCCommand commands[] =
     { "blockchain",         "getrawmempool",          &getrawmempool,          true,  {"verbose"} },
     { "blockchain",         "gettxout",               &gettxout,               true,  {"txid","n","include_mempool"} },
     { "blockchain",         "gettxoutsetinfo",        &gettxoutsetinfo,        true,  {} },
+    { "blockchain",         "pruneblockchain",        &pruneblockchain,        true,  {"height"} },
     { "blockchain",         "verifychain",            &verifychain,            true,  {"checklevel","nblocks"} },
 
     { "blockchain",         "preciousblock",          &preciousblock,          true,  {"blockhash"} },
-- 
cgit v1.2.3