How to Handle Errors in Deferred Functions When Opening Database Connections?

Handling Errors in Deferred Functions

When using defer to perform cleanup operations, it's important to consider how errors are handled. In the scenario described, a function OpenDbConnection opens a database connection and returns the connection or an error. Within this function, a logger is used with the Sync method, which also returns an error.

Best Practice for Handling Sync Error

According to the Go linter, ignoring errors is not a good practice. However, in this case, the main objective is to establish a database connection. Ignoring the Sync error allows the function to return a valid connection even if the logger sync operation fails.

Strategies for Error Handling

One option to avoid the linter error is to use an anonymous function to handle the Sync error:

logger := zap.NewExample().Sugar()
defer func() {
    _ = logger.Sync()
}()

This approach separates the error handling from the defer statement, effectively disregarding the error.

Another option is to return the Sync error along with the database connection:

func OpenDbConnection(connectionString string, logSql bool) (*gorm.DB, error) {

    logger := zap.NewExample().Sugar()

    defer func() {
        err := logger.Sync()
        return &err
    }()

    // some logic here

    return db, err
}

This allows the calling function to analyze the error and determine appropriate actions. However, it requires modification of the calling function to handle this additional return value.

Recommended Solution

The best strategy depends on the specific requirements of the application. If preserving a valid database connection is critical, while logging errors is a secondary concern, ignoring the Sync error using the anonymous function approach may be acceptable.

If detailed error analysis is necessary, returning the Sync error along with the connection provides the calling function with full control over error handling.

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