socketsetvalue

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 socket/connection-level context. The pointer is dereferenced when the first message is processed, so updates to the pointed-to value after that won't be reflected. The value persists for the lifetime of the WebSocket connection and is thread-safe.

Use this when you have a pointer to a value that you want to store by value at the connection level.

Example:

config := &ServerConfig{Timeout: 30}
router.Use(socketsetvalue.Middleware("config", config))  // Stores *config (dereferenced)

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

Note: The value is dereferenced on first message, not at middleware creation time.

See also: socketset.Middleware for direct values, socketsetfn.Middleware for dynamic values.