Merge pull request #743 from gavinandresen/blocknotify

-blocknotify : run a command when best-block changes

src/main.cpp

@@ -7,6 +7,7 @@
 #include "db.h"
 #include "net.h"
 #include "init.h"
+#include <boost/algorithm/string/replace.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
 
@@ -1278,6 +1279,14 @@ bool static Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
 }
 
 
+static void
+runCommand(std::string strCommand)
+{
+    int nErr = ::system(strCommand.c_str());
+    if (nErr)
+        printf("runCommand error: system(%s) returned %d\n", strCommand.c_str(), nErr);
+}
+
 bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
 {
     uint256 hash = GetHash();
@@ -1321,7 +1330,8 @@ bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
     }
 
     // Update best block in wallet (so we can detect restored wallets)
-    if (!IsInitialBlockDownload())
+    bool fIsInitialDownload = IsInitialBlockDownload();
+    if (!fIsInitialDownload)
     {
         const CBlockLocator locator(pindexNew);
         ::SetBestChain(locator);
@@ -1336,6 +1346,14 @@ bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
     nTransactionsUpdated++;
     printf("SetBestChain: new best=%s  height=%d  work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
 
+    std::string strCmd = GetArg("-blocknotify", "");
+
+    if (!fIsInitialDownload && !strCmd.empty())
+    {
+        boost::replace_all(strCmd, "%s", hashBestChain.GetHex());
+        boost::thread t(runCommand, strCmd); // thread runs free
+    }
+
     return true;
 }