Jeet Parekh

@hobbesuk, your user will need to have `oplog` access. Check out the notes section in the [mongodb docs](https://github.com/appbaseio/abc/blob/dev/docs/importer/adaptors/mongodb.md).

@masumsoft, postgres and mongo have tailing support. Check out the [postgres](https://github.com/appbaseio/abc/blob/dev/docs/importer/adaptors/postgres.md) and [mongodb](https://github.com/appbaseio/abc/blob/dev/docs/importer/adaptors/mongodb.md) docs.

I've been exploring the code under `src/ffi`, and also the CPython header files. I have a question. I noticed that sometimes the `#define`s from the C header files are implemented...

Thanks! I guess implementing the `struct`s would be a good way to get started. And if they use any macros or other constant `#define`s, then I include that as well....

Still exploring the FFI code slowly. I have a few more questions. Would appreciate some pointers. 1. Some functions are implemented as unsafe. https://github.com/PyO3/pyo3/blob/b3659692cd9fb894ba2b79df252bdd9115179091/src/ffi/datetime.rs#L235-L237 And some are not unsafe. https://github.com/PyO3/pyo3/blob/b3659692cd9fb894ba2b79df252bdd9115179091/src/ffi/datetime.rs#L317-L324...