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Useful for fuzzing different values.
Allow callers to inject a custom leveldb::Env via DBParams::testing_env, which takes priority over the memory_only in-memory environment. This enables fuzz harnesses to supply a deterministic environment.
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Introduces a libFuzzer harness that exercises CDBWrapper operations against a std::map oracle, with a DeterministicEnv that captures LevelDB background compaction for single-threaded determinism.
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Inspired by #34866 (comment).
We currently don't have a dedicated harness targeting
CDBWrapper. OSS-Fuzz has a rudimentary harness for levelDB which fails, so doesn't appear maintained.This PR adds a harness targeting
CDBWrapperagainst an in-memory oracle to verify correctness.A
DeterministicEnvwraps levelDB'smemenvto eliminate non-determinism by capturing background compaction and running it at fuzzer-chosen points.The fuzzer also controls the cache_bytes and max_file_size sizes so that small values trigger memtable flushes and compaction.