socketset

func Middleware ¶

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

Middleware creates middleware that sets a value on the socket/connection-level context. The value is set once when the middleware is created and reused for all messages on all connections. Values set at the socket level persist for the lifetime of the WebSocket connection and are thread-safe (can be accessed from concurrent message handlers).

Use this when you want to share a constant value across all handlers for a connection.

Example:

router.Use(socketset.Middleware("serverVersion", "1.0.0"))

router.Bind("/info", func(ctx *velaros.Context) {
    version := ctx.MustGetFromSocket("serverVersion").(string)  // "1.0.0"
    ctx.Send(map[string]string{"version": version})
})

Note: For connection-specific values like user sessions, use UseOpen instead.

See also: socketsetfn.Middleware for dynamic values, socketsetvalue.Middleware for pointer values.