setvalue

func Middleware ¶

func Middleware[V any](key string, value *V) func(ctx *velaros.Context)

Middleware creates middleware that sets a dereferenced pointer value on the message-level context. The pointer is dereferenced when the middleware is created, so updates to the pointed-to value after middleware creation won't be reflected. Values set at the message level only exist for the duration of that message's handler chain.

Use this when you have a pointer to a value that you want to store by value.

Example:

config := &AppConfig{MaxRetries: 3}
router.Use(setvalue.Middleware("config", config))  // Stores *config (dereferenced)

router.Bind("/process", func(ctx *velaros.Context) {
    cfg := ctx.MustGet("config").(AppConfig)  // Gets the value, not pointer
    // ...
})

See also: set.Middleware for direct values, setfn.Middleware for dynamic values.