-
Notifications
You must be signed in to change notification settings - Fork 324
/
sort.go
72 lines (63 loc) · 1.72 KB
/
sort.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
// Copyright Envoy Gateway Authors
// SPDX-License-Identifier: Apache-2.0
// The full text of the Apache license is available in the LICENSE file at
// the root of the repo.
package gatewayapi
import (
"sort"
"github.com/envoyproxy/gateway/internal/ir"
)
type XdsIRRoutes []*ir.HTTPRoute
func (x XdsIRRoutes) Len() int { return len(x) }
func (x XdsIRRoutes) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
func (x XdsIRRoutes) Less(i, j int) bool {
// 1. Sort based on characters in a matching path.
pCountI := pathMatchCount(x[i].PathMatch)
pCountJ := pathMatchCount(x[j].PathMatch)
if pCountI < pCountJ {
return true
}
if pCountI > pCountJ {
return false
}
// Equal case
// 2. Sort based on the number of Header matches.
hCountI := len(x[i].HeaderMatches)
hCountJ := len(x[j].HeaderMatches)
if hCountI < hCountJ {
return true
}
if hCountI > hCountJ {
return false
}
// Equal case
// 3. Sort based on the number of Query param matches.
qCountI := len(x[i].QueryParamMatches)
qCountJ := len(x[j].QueryParamMatches)
return qCountI < qCountJ
}
// sortXdsIR sorts the xdsIR based on the match precedence
// defined in the Gateway API spec.
// https://gateway-api.sigs.k8s.io/references/spec/#gateway.networking.k8s.io/v1beta1.HTTPRouteRule
func sortXdsIRMap(xdsIR XdsIRMap) {
for _, irItem := range xdsIR {
for _, http := range irItem.HTTP {
// descending order
sort.Sort(sort.Reverse(XdsIRRoutes(http.Routes)))
}
}
}
func pathMatchCount(pathMatch *ir.StringMatch) int {
if pathMatch != nil {
if pathMatch.Exact != nil {
return len(*pathMatch.Exact)
}
if pathMatch.Prefix != nil {
return len(*pathMatch.Prefix)
}
if pathMatch.SafeRegex != nil {
return len(*pathMatch.SafeRegex)
}
}
return 0
}