Merge #17410: Rename `db` log category to `walletdb` (like `coindb`)

e2c03c1156a1a8cb2c04c180f2ddbd3535126a46 doc: Add relase note for db→walletdb rename (Wladimir J. van der Laan)
4c1d263d93988ceed53e8f6b5decaf034b68137e scripted-diff: Change `BCLog::DB` to `BCLog::WALLETDB` (Wladimir J. van der Laan)
6b42b3ba9087225fddb91dd764c42c28d0c42d0f Rename `db` log category to `walletdb` (like `coindb`) (Wladimir J. van der Laan)

Pull request description:

  Rename the `db` log category to `walletdb` (in the style of, and to distinguish from `coindb`). Deprecate (but still accept) '-debug=db'.

  Second commit is a scripted commit that changes the enum item name.

ACKs for top commit:
  hebasto:
    ACK e2c03c1156a1a8cb2c04c180f2ddbd3535126a46, tested on Linux Mint 19.2:

Tree-SHA512: a044de6f9a70e735cbb1caa4ed6bf75bc2269b2d5bc3241a25b6a6d69c1fc1d83456e252b431388ae61f4821e4fc06ecc1b634816ceadbe9a3c0e494bee6c11e

4 files changed, 21 insertions, 13 deletions

diff --git a/src/logging.cpp b/src/logging.cpp
index b01177f23f..9f6b5ede12 100644
--- a/src/logging.cpp
+++ b/src/logging.cpp
@@ -95,7 +95,15 @@ void BCLog::Logger::EnableCategory(BCLog::LogFlags flag)
 bool BCLog::Logger::EnableCategory(const std::string& str)
 {
     BCLog::LogFlags flag;
-    if (!GetLogCategory(flag, str)) return false;
+    if (!GetLogCategory(flag, str)) {
+        if (str == "db") {
+            // DEPRECATION: Added in 0.20, should start returning an error in 0.21
+            LogPrintf("Warning: logging category 'db' is deprecated, use 'walletdb' instead\n");
+            EnableCategory(BCLog::WALLETDB);
+            return true;
+        }
+        return false;
+    }
     EnableCategory(flag);
     return true;
 }
@@ -139,7 +147,7 @@ const CLogCategoryDesc LogCategories[] =
     {BCLog::HTTP, "http"},
     {BCLog::BENCH, "bench"},
     {BCLog::ZMQ, "zmq"},
-    {BCLog::DB, "db"},
+    {BCLog::WALLETDB, "walletdb"},
     {BCLog::RPC, "rpc"},
     {BCLog::ESTIMATEFEE, "estimatefee"},
     {BCLog::ADDRMAN, "addrman"},
diff --git a/src/logging.h b/src/logging.h
index 9ed41c2b98..a2caef51a8 100644
--- a/src/logging.h
+++ b/src/logging.h
@@ -39,7 +39,7 @@ namespace BCLog {
         HTTP        = (1 <<  3),
         BENCH       = (1 <<  4),
         ZMQ         = (1 <<  5),
-        DB          = (1 <<  6),
+        WALLETDB    = (1 <<  6),
         RPC         = (1 <<  7),
         ESTIMATEFEE = (1 <<  8),
         ADDRMAN     = (1 <<  9),
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index 76f14cb33f..79825847c8 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -242,7 +242,7 @@ BerkeleyEnvironment::BerkeleyEnvironment()
 {
     Reset();
 
-    LogPrint(BCLog::DB, "BerkeleyEnvironment::MakeMock\n");
+    LogPrint(BCLog::WALLETDB, "BerkeleyEnvironment::MakeMock\n");
 
     dbenv->set_cachesize(1, 0, 1);
     dbenv->set_lg_bsize(10485760 * 4);
@@ -765,7 +765,7 @@ void BerkeleyEnvironment::Flush(bool fShutdown)
 {
     int64_t nStart = GetTimeMillis();
     // Flush log data to the actual data file on all files that are not in use
-    LogPrint(BCLog::DB, "BerkeleyEnvironment::Flush: [%s] Flush(%s)%s\n", strPath, fShutdown ? "true" : "false", fDbEnvInit ? "" : " database not started");
+    LogPrint(BCLog::WALLETDB, "BerkeleyEnvironment::Flush: [%s] Flush(%s)%s\n", strPath, fShutdown ? "true" : "false", fDbEnvInit ? "" : " database not started");
     if (!fDbEnvInit)
         return;
     {
@@ -774,21 +774,21 @@ void BerkeleyEnvironment::Flush(bool fShutdown)
         while (mi != mapFileUseCount.end()) {
             std::string strFile = (*mi).first;
             int nRefCount = (*mi).second;
-            LogPrint(BCLog::DB, "BerkeleyEnvironment::Flush: Flushing %s (refcount = %d)...\n", strFile, nRefCount);
+            LogPrint(BCLog::WALLETDB, "BerkeleyEnvironment::Flush: Flushing %s (refcount = %d)...\n", strFile, nRefCount);
             if (nRefCount == 0) {
                 // Move log data to the dat file
                 CloseDb(strFile);
-                LogPrint(BCLog::DB, "BerkeleyEnvironment::Flush: %s checkpoint\n", strFile);
+                LogPrint(BCLog::WALLETDB, "BerkeleyEnvironment::Flush: %s checkpoint\n", strFile);
                 dbenv->txn_checkpoint(0, 0, 0);
-                LogPrint(BCLog::DB, "BerkeleyEnvironment::Flush: %s detach\n", strFile);
+                LogPrint(BCLog::WALLETDB, "BerkeleyEnvironment::Flush: %s detach\n", strFile);
                 if (!fMockDb)
                     dbenv->lsn_reset(strFile.c_str(), 0);
-                LogPrint(BCLog::DB, "BerkeleyEnvironment::Flush: %s closed\n", strFile);
+                LogPrint(BCLog::WALLETDB, "BerkeleyEnvironment::Flush: %s closed\n", strFile);
                 mapFileUseCount.erase(mi++);
             } else
                 mi++;
         }
-        LogPrint(BCLog::DB, "BerkeleyEnvironment::Flush: Flush(%s)%s took %15dms\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " database not started", GetTimeMillis() - nStart);
+        LogPrint(BCLog::WALLETDB, "BerkeleyEnvironment::Flush: Flush(%s)%s took %15dms\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " database not started", GetTimeMillis() - nStart);
         if (fShutdown) {
             char** listp;
             if (mapFileUseCount.empty()) {
@@ -828,7 +828,7 @@ bool BerkeleyBatch::PeriodicFlush(BerkeleyDatabase& database)
             std::map<std::string, int>::iterator mi = env->mapFileUseCount.find(strFile);
             if (mi != env->mapFileUseCount.end())
             {
-                LogPrint(BCLog::DB, "Flushing %s\n", strFile);
+                LogPrint(BCLog::WALLETDB, "Flushing %s\n", strFile);
                 int64_t nStart = GetTimeMillis();
 
                 // Flush wallet file so it's self contained
@@ -836,7 +836,7 @@ bool BerkeleyBatch::PeriodicFlush(BerkeleyDatabase& database)
                 env->CheckpointLSN(strFile);
 
                 env->mapFileUseCount.erase(mi++);
-                LogPrint(BCLog::DB, "Flushed %s %dms\n", strFile, GetTimeMillis() - nStart);
+                LogPrint(BCLog::WALLETDB, "Flushed %s %dms\n", strFile, GetTimeMillis() - nStart);
                 ret = true;
             }
         }
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 2ba7cdac36..7d04b04764 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -629,7 +629,7 @@ DBErrors WalletBatch::ZapSelectTx(std::vector<uint256>& vTxHashIn, std::vector<u
         }
         else if ((*it) == hash) {
             if(!EraseTx(hash)) {
-                LogPrint(BCLog::DB, "Transaction was found for deletion but returned database error: %s\n", hash.GetHex());
+                LogPrint(BCLog::WALLETDB, "Transaction was found for deletion but returned database error: %s\n", hash.GetHex());
                 delerror = true;
             }
             vTxHashOut.push_back(hash);