Better error messages

[salseeg]

Hi @lucaong
Thanks for CubDB, it is awesome on Nerves.

Here is what I get when hitting limit of FAT32 formatted usb drive.

2022-12-30 18:08:03.356000 [error] GenServer Chat.Db.MainDb.QueueWriter terminating
** (UndefinedFunctionError) function :efbig.exception/1 is undefined (module :efbig is not available)
    :efbig.exception([])
    (cubdb 2.0.1) lib/cubdb/store/file.ex:153: CubDB.Store.CubDB.Store.File.raise_if_error/1
    (cubdb 2.0.1) lib/cubdb/btree.ex:471: anonymous fn/2 in CubDB.Btree.store_nodes/2
    (elixir 1.14.1) lib/enum.ex:1658: Enum."-map/2-lists^map/1-0-"/2
    (cubdb 2.0.1) lib/cubdb/btree.ex:461: CubDB.Btree.build_up/6
    (cubdb 2.0.1) lib/cubdb/btree.ex:299: CubDB.Btree.insert_terminal_node/4
    (cubdb 2.0.1) lib/cubdb/transaction.ex:228: CubDB.Tx.put/3
    (chat 0.1.0) lib/chat/db/queue_writer.ex:136: anonymous fn/2 in Chat.Db.QueueWriter.db_write/2
Last message: {:"$gen_cast", {:write, [{{:file_chunk, "8f417917-4f7e-4e1d-9283-1ff9585d4999", 20971520, 31457279}, <<212, 108, 227, 95, 116, 106, 124, 96, 64, 180, 45, 210, 120, 69, 60, 72, 155, 253, 163, 152, 202, 21, 122, 2, 107, 16, 158, 142, 124, 191, 37, 122, 130, 57, 112, 4, 91, 40, 210, 77, 164, 214, 41, ...>>}]}}

This error message leads nowhere since :efbig module does not exist in Erlang.
It is actually a POSIX error returned by :file module.

Having it like {:file, :efbig} would be less misguiding 😉

[lucaong]

Hi @salseeg ,
very good point, I will fix this.