In order to get records beginning with a prefix, we will need a cursor
specifically for that prefix. So add a GetPrefixCursor function and
DatabaseCursor classes for dealing with those prefixes.
Tested on each supported db engine.
1) Write two different key->value elements to db.
2) Create a new prefix cursor and walk-through every returned element,
verifying that it gets parsed properly.
3) Try to move the cursor outside the filtered range: expect failure
and flag complete=true.
Co-Authored-By: Ryan Ofsky <ryan@ofsky.org>
Co-Authored-By: furszy <matiasfurszyfer@protonmail.com>
The fs.* files are already part of the libbitcoin_util library. With the
introduction of the fs_helpers.* it makes sense to move fs.* into the
util/ directory as well.
No observable change in behavior. This just avoids a redundant environment
lookup. Motivation is to be able to simplify the GetWalletEnv implementation in
an upcoming commit.
This removes a source of complexity and indirection that makes it harder to
understand path checking code. Path checks will be simplified in upcoming
commits.
There is no change in behavior in this commit other than a slightly more
descriptive error message in `loadwallet` if the default "" wallet can't be
found. (The error message is improved more in upcoming commit "wallet: Remove
path checking code from loadwallet RPC".)
Instead of removing the database transaction logs and retrying the
wallet loading, just return an error message to the user. Additionally,
specifically for DB_RUNRECOVERY, notify the user that this could be due
to different BDB versions. This error is pretty much only caused by
compiling with a newer version of BDB and then trying to open the wallet
with a version compiled with an older version of BDB.
