Merge #15894: Remove duplicated "Error: " prefix in logs

f724f31401b963c75bd64f5e2c5b9d9561a9a9dd Make AbortNode() aware of MSG_NOPREFIX flag (Hennadii Stepanov)
96fd4ee02f6c3be21cade729b95a85c60634b0f8 Add MSG_NOPREFIX flag for user messages (Hennadii Stepanov)
f0641f274ffe94fbe7cae43c07a9373013739df2 Prepend the error/warning prefix for GUI messages (Hennadii Stepanov)

Pull request description:

  The "Error" prefix/title is set already in the next functions:
  - `noui_ThreadSafeMessageBox()`https://github.com/bitcoin/bitcoin/blob/2068f089c8b7b90eb4557d3f67ea0f0ed2059a23/src/noui.cpp#L17
  - `ThreadSafeMessageBox()`https://github.com/bitcoin/bitcoin/blob/a720a983015c9ef8cc814c16a5b9ef6379695817/src/qt/bitcoingui.cpp#L1351

  Currently on master:
  ![Screenshot from 2019-04-25 22-08-54](https://user-images.githubusercontent.com/32963518/56763092-25ee8280-67aa-11e9-86c8-6a029dd9ab08.png)

  With this PR:
  ![Screenshot from 2019-04-25 22-26-36](https://user-images.githubusercontent.com/32963518/56763107-30108100-67aa-11e9-9021-683cbd7e2aaa.png)

ACKs for top commit:
  laanwj:
    concept and code-review ACK f724f31401b963c75bd64f5e2c5b9d9561a9a9dd

Tree-SHA512: 218a179b81cc2ac64239d833c02b4c4d4da9b976728a2dcd645966726c4c660b6f1fe43aa28f33d1cb566785a4329e7f93bf5a502bf202316db79d2ff5fce0f8

1 files changed, 12 insertions, 10 deletions

diff --git a/src/validation.cpp b/src/validation.cpp
index 2d2252c251..d39b78614c 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1374,20 +1374,22 @@ bool UndoReadFromDisk(CBlockUndo& blockundo, const CBlockIndex* pindex)
 }
 
 /** Abort with a message */
-static bool AbortNode(const std::string& strMessage, const std::string& userMessage="")
+static bool AbortNode(const std::string& strMessage, const std::string& userMessage = "", unsigned int prefix = 0)
 {
     SetMiscWarning(strMessage);
     LogPrintf("*** %s\n", strMessage);
-    uiInterface.ThreadSafeMessageBox(
-        userMessage.empty() ? _("Error: A fatal internal error occurred, see debug.log for details") : userMessage,
-        "", CClientUIInterface::MSG_ERROR);
+    if (!userMessage.empty()) {
+        uiInterface.ThreadSafeMessageBox(userMessage, "", CClientUIInterface::MSG_ERROR | prefix);
+    } else {
+        uiInterface.ThreadSafeMessageBox(_("Error: A fatal internal error occurred, see debug.log for details"), "", CClientUIInterface::MSG_ERROR | CClientUIInterface::MSG_NOPREFIX);
+    }
     StartShutdown();
     return false;
 }
 
-static bool AbortNode(CValidationState& state, const std::string& strMessage, const std::string& userMessage="")
+static bool AbortNode(CValidationState& state, const std::string& strMessage, const std::string& userMessage = "", unsigned int prefix = 0)
 {
-    AbortNode(strMessage, userMessage);
+    AbortNode(strMessage, userMessage, prefix);
     return state.Error(strMessage);
 }
 
@@ -1998,7 +2000,7 @@ bool CChainState::FlushStateToDisk(
         if (fDoFullFlush || fPeriodicWrite) {
             // Depend on nMinDiskSpace to ensure we can write block index
             if (!CheckDiskSpace(GetBlocksDir())) {
-                return AbortNode(state, "Disk space is low!", _("Error: Disk space is low!"));
+                return AbortNode(state, "Disk space is too low!", _("Error: Disk space is too low!"), CClientUIInterface::MSG_NOPREFIX);
             }
             // First make sure all block and undo data is flushed to disk.
             FlushBlockFile();
@@ -2033,7 +2035,7 @@ bool CChainState::FlushStateToDisk(
             // an overestimation, as most will delete an existing entry or
             // overwrite one. Still, use a conservative safety factor of 2.
             if (!CheckDiskSpace(GetDataDir(), 48 * 2 * 2 * pcoinsTip->GetCacheSize())) {
-                return AbortNode(state, "Disk space is low!", _("Error: Disk space is low!"));
+                return AbortNode(state, "Disk space is too low!", _("Error: Disk space is too low!"), CClientUIInterface::MSG_NOPREFIX);
             }
             // Flush the chainstate (which may refer to block index entries).
             if (!pcoinsTip->Flush())
@@ -2899,7 +2901,7 @@ static bool FindBlockPos(FlatFilePos &pos, unsigned int nAddSize, unsigned int n
         bool out_of_space;
         size_t bytes_allocated = BlockFileSeq().Allocate(pos, nAddSize, out_of_space);
         if (out_of_space) {
-            return AbortNode("Disk space is low!", _("Error: Disk space is low!"));
+            return AbortNode("Disk space is too low!", _("Error: Disk space is too low!"), CClientUIInterface::MSG_NOPREFIX);
         }
         if (bytes_allocated != 0 && fPruneMode) {
             fCheckForPruning = true;
@@ -2923,7 +2925,7 @@ static bool FindUndoPos(CValidationState &state, int nFile, FlatFilePos &pos, un
     bool out_of_space;
     size_t bytes_allocated = UndoFileSeq().Allocate(pos, nAddSize, out_of_space);
     if (out_of_space) {
-        return AbortNode(state, "Disk space is low!", _("Error: Disk space is low!"));
+        return AbortNode(state, "Disk space is too low!", _("Error: Disk space is too low!"), CClientUIInterface::MSG_NOPREFIX);
     }
     if (bytes_allocated != 0 && fPruneMode) {
         fCheckForPruning = true;