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source_middleware.go
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/
source_middleware.go
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// Copyright © 2022 Meroxa, Inc.
//
// 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 sdk
// SourceMiddleware wraps a Source and adds functionality to it.
type SourceMiddleware interface {
Wrap(Source) Source
}
// DefaultSourceMiddleware returns a slice of middleware that should be added to
// all sources unless there's a good reason not to.
func DefaultSourceMiddleware() []SourceMiddleware {
return []SourceMiddleware{
// TODO add default middleware (e.g. rate limit)
}
}
// SourceWithMiddleware wraps the source into the supplied middleware.
func SourceWithMiddleware(d Source, middleware ...SourceMiddleware) Source {
for _, m := range middleware {
d = m.Wrap(d)
}
return d
}