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Add optional transaction index to databases

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By specifying -txindex when initializing the database, a txid-to-diskpos
index is maintained in the blktree database. This database is used to
help answering getrawtransaction() RPC queries, when enabled.

Changing the -txindex value requires a -reindex; the client will abort
at startup if the database and the specified -txindex mismatch.
This commit is contained in:
Pieter Wuille
2013-01-11 01:47:57 +01:00
committed by Pieter Wuille
parent 2c7847349d
commit 2d1fa42e85
5 changed files with 94 additions and 7 deletions
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6
src/init.cpp
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@@ -305,6 +305,7 @@ std::string HelpMessage()
" -salvagewallet " + _("Attempt to recover private keys from a corrupt wallet.dat") + "\n" +
" -checkblocks=<n> " + _("How many blocks to check at startup (default: 2500, 0 = all)") + "\n" +
" -checklevel=<n> " + _("How thorough the block verification is (0-4, default: 3)") + "\n" +
" -txindex " + _("Maintain a full transaction index (default: 0)") + "\n" +
" -loadblock=<file> " + _("Imports blocks from external blk000??.dat file") + "\n" +
" -reindex " + _("Rebuild blockchain index from current blk000??.dat files") + "\n" +
" -par=N " + _("Set the number of script verification threads (1-16, 0=auto, default: 0)") + "\n" +
@@ -781,7 +782,7 @@ bool AppInit2()
if (nTotalCache < (1 << 22))
nTotalCache = (1 << 22); // total cache cannot be less than 4 MiB
size_t nBlockTreeDBCache = nTotalCache / 8;
if (nBlockTreeDBCache > (1 << 21))
if (nBlockTreeDBCache > (1 << 21) && !GetBoolArg("-txindex", false))
nBlockTreeDBCache = (1 << 21); // block tree db cache shouldn't be larger than 2 MiB
nTotalCache -= nBlockTreeDBCache;
size_t nCoinDBCache = nTotalCache / 2; // use half of the remaining cache for coindb cache
@@ -806,6 +807,9 @@ bool AppInit2()
if (!VerifyDB())
return InitError(_("Corrupted block database detected. Please restart the client with -reindex."));
if (mapArgs.count("-txindex") && fTxIndex != GetBoolArg("-txindex", false))
return InitError(_("You need to rebuild the databases using -reindex to change -txindex"));
// as LoadBlockIndex can take several minutes, it's possible the user
// requested to kill bitcoin-qt during the last operation. If so, exit.
// As the program has not fully started yet, Shutdown() is possibly overkill.