Merge #11911: Free BerkeleyEnvironment instances when not in use #4263
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14bc2a1 Trivial: add doxygen-compatible comments relating to BerkeleyEnvironment (Pierre Rochard) 88b1d95 Tests: add unit tests for GetWalletEnv (Pierre Rochard) f1f4bb7 Free BerkeleyEnvironment instances when not in use (Russell Yanofsky) Pull request description: Instead of adding BerkeleyEnvironment objects permanently to the g_dbenvs map, use reference counted shared pointers and remove map entries when the last BerkeleyEnvironment reference goes out of scope. This change was requested by @TheBlueMatt and makes code that sets up mock databases cleaner. The mock database environment will now go out of scope and be reset on destruction so there is no need to call BerkeleyEnvironment::Reset() during wallet construction to clear out prior state. This change does affect bitcoin behavior slightly. On startup, instead of same wallet environments staying open throughout VerifyWallets() and OpenWallets() calls, VerifyWallets() will open and close an environment once for each wallet, and OpenWallets() will create its own environment(s) later. Tree-SHA512: 219d77a9e2268298435b86088f998795e059fdab1d2050ba284a9ab8d8a44961c9b5cf96e94ee521688108d23c6db680e3e3a999b8cb2ac2a8590f691d50668b
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Required to backport 17405 (and 18792) in #4246
Mostly trivial 1:1, the difference is that in
src/wallet/wallet.cppwe usetempWalletinstead of temporarydatabasebecause we can't callWalletDatabase::Createtwice for the same wallet (until it's released) and we need a temporary wallet instance to be able to create backups on start.