/
handlerrouter.go
59 lines (47 loc) · 1.91 KB
/
handlerrouter.go
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/*
* Copyright 2019 Insolar
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package artifactmanager
import (
"context"
"github.com/insolar/insolar/core"
)
// Handler is an alias for wrapping func-s
type Handler func(core.MessageHandler) core.MessageHandler
// BuildMiddleware return wrapping core.MessageHandler
// If want call wrapHandler1(wrapHandler2(wrapHandler3(handler))),
// we should use Build(handler, wrapHandler1, wrapHandler2, wrapHandler3).
func BuildMiddleware(handler core.MessageHandler, wrapHandlers ...Handler) core.MessageHandler {
result := handler
for i := range wrapHandlers {
result = wrapHandlers[len(wrapHandlers)-1-i](result)
}
return result
}
// PreSender is an alias for a function
// which is working like a `middleware` for messagebus.Send
type PreSender func(Sender) Sender
// Sender is an alias for signature of messagebus.Send
type Sender func(context.Context, core.Message, *core.MessageSendOptions) (core.Reply, error)
// BuildSender allows us to build a chain of PreSender before calling Sender
// The main idea of it is ability to make a different things before sending message
// For example we can cache some replies. Another example is the sendAndFollow redirect method
func BuildSender(sender Sender, preSenders ...PreSender) Sender {
result := sender
for i := range preSenders {
result = preSenders[len(preSenders)-1-i](result)
}
return result
}