Enum DbError 

pub enum DbError {
    Io(Error),
    Serialization(Error),
    LockPoisoned,
    WriteError,
    InvalidQuery(String),
    TypeMismatch(String),
    CollectionNotFound,
}

All possible errors that can occur in the database engine.

Using an enum instead of a string means callers can pattern-match on the error type and handle each case differently if needed.

Variants

Io(Error)

A file system I/O error (e.g. disk full, permission denied). Wraps std::io::Error so the original OS error is preserved.

Serialization(Error)

A JSON serialization or deserialization error. Wraps serde_json::Error so the original parse error is preserved.

LockPoisoned

A Mutex was poisoned — this happens when a thread panicked while holding the lock. The lock is now in an undefined state and cannot be safely acquired. This is a programming error, not a user error.

WriteError

A generic write failure used when the specific cause is not an I/O error — for example, when the MPSC channel is closed (server shutting down) or when an OPFS browser API call fails (returns a JS error).

InvalidQuery(String)

An invalid query operator or structure was encountered.

TypeMismatch(String)

A query attempted an operation on an incompatible data type (e.g. $gt on a string that isn’t a number).

CollectionNotFound

The requested collection does not exist.

Trait Implementations

impl Debug for DbError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for DbError

Implement Display so DbError can be printed with {} formatting. This is also required by the std::error::Error trait.

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<Error> for DbError

Allow std::io::Error to be converted to DbError with the ? operator. This means any function returning Result<_, DbError> can use ? on file I/O operations without manually wrapping the error.

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<Error> for DbError

Allow serde_json::Error to be converted to DbError with the ? operator. This means any function returning Result<_, DbError> can use ? on JSON serialization/deserialization operations.

fn from(err: Error) -> Self

Converts to this type from the input type.