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middleware.go
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middleware.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package middleware
import (
"context"
"sync"
"github.com/gorilla/mux"
"namespacelabs.dev/foundation/std/go/core"
)
var middlewares struct {
mu sync.Mutex
registrations []Middleware // Each index of `unary` and `streaming` maps back to the same index `Registration`.
middlewares []mux.MiddlewareFunc
}
type Middleware struct {
owner *core.InstantiationPath
name string
}
func (r Middleware) Add(middleware mux.MiddlewareFunc) {
core.AssertNotRunning("AddMiddleware")
middlewares.mu.Lock()
defer middlewares.mu.Unlock()
middlewares.registrations = append(middlewares.registrations, r)
middlewares.middlewares = append(middlewares.middlewares, middleware)
}
func Consume() []mux.MiddlewareFunc {
middlewares.mu.Lock()
defer middlewares.mu.Unlock()
unary := middlewares.middlewares
middlewares.registrations = nil
middlewares.middlewares = nil
return unary
}
func ProvideMiddleware(ctx context.Context, r *MiddlewareRegistration) (Middleware, error) {
return Middleware{owner: core.InstantiationPathFromContext(ctx), name: r.GetName()}, nil
}