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request.go
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request.go
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// Copyright 2019 Anapaya Systems
//
// 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 segfetcher
import (
"github.com/scionproto/scion/go/lib/addr"
"github.com/scionproto/scion/go/lib/ctrl/seg"
)
// Request represents a path or segment request.
type Request struct {
Src addr.IA
Dst addr.IA
SegType seg.Type
}
// IsZero returns whether the request is empty.
func (r Request) IsZero() bool {
return r.Src.IsZero() && r.Dst.IsZero()
}
// Equal returns whether the two request refer to the same src/dst/type.
func (r Request) Equal(other Request) bool {
return r.Src.Equal(other.Src) && r.Dst.Equal(other.Dst) && r.SegType == other.SegType
}
// Requests is a list of requests and provides some convenience methods on top
// of it.
type Requests []Request
// SrcIAs returns all unique sources in the request list.
func (r Requests) SrcIAs() []addr.IA {
return r.extractIAs(func(req Request) addr.IA { return req.Src })
}
// DstIAs returns all unique destinations in the request list.
func (r Requests) DstIAs() []addr.IA {
return r.extractIAs(func(req Request) addr.IA { return req.Dst })
}
// IsEmpty returns whether the list of requests is empty.
func (r Requests) IsEmpty() bool {
return len(r) == 0
}
func (r Requests) extractIAs(extract func(Request) addr.IA) []addr.IA {
set := make(map[addr.IA]struct{})
for _, req := range r {
set[extract(req)] = struct{}{}
}
ias := make([]addr.IA, 0, len(set))
for ia := range set {
ias = append(ias, ia)
}
return ias
}