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matcher.go
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/
matcher.go
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/*
*
* Copyright 2020 gRPC authors.
*
* 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 xdsrouting
import (
"fmt"
"strings"
"github.com/CSCI-2390-Project/grpc-go/balancer"
"github.com/CSCI-2390-Project/grpc-go/internal/grpcrand"
"github.com/CSCI-2390-Project/grpc-go/internal/grpcutil"
"github.com/CSCI-2390-Project/grpc-go/metadata"
)
// compositeMatcher.match returns true if all matchers return true.
type compositeMatcher struct {
pm pathMatcherInterface
hms []headerMatcherInterface
fm *fractionMatcher
}
func newCompositeMatcher(pm pathMatcherInterface, hms []headerMatcherInterface, fm *fractionMatcher) *compositeMatcher {
return &compositeMatcher{pm: pm, hms: hms, fm: fm}
}
func (a *compositeMatcher) match(info balancer.PickInfo) bool {
if a.pm != nil && !a.pm.match(info.FullMethodName) {
return false
}
// Call headerMatchers even if md is nil, because routes may match
// non-presence of some headers.
var md metadata.MD
if info.Ctx != nil {
md, _ = metadata.FromOutgoingContext(info.Ctx)
if extraMD, ok := grpcutil.ExtraMetadata(info.Ctx); ok {
md = metadata.Join(md, extraMD)
// Remove all binary headers. They are hard to match with. May need
// to add back if asked by users.
for k := range md {
if strings.HasSuffix(k, "-bin") {
delete(md, k)
}
}
}
}
for _, m := range a.hms {
if !m.match(md) {
return false
}
}
if a.fm != nil && !a.fm.match() {
return false
}
return true
}
func (a *compositeMatcher) equal(mm *compositeMatcher) bool {
if a == mm {
return true
}
if a == nil || mm == nil {
return false
}
if (a.pm != nil || mm.pm != nil) && (a.pm == nil || !a.pm.equal(mm.pm)) {
return false
}
if len(a.hms) != len(mm.hms) {
return false
}
for i := range a.hms {
if !a.hms[i].equal(mm.hms[i]) {
return false
}
}
if (a.fm != nil || mm.fm != nil) && (a.fm == nil || !a.fm.equal(mm.fm)) {
return false
}
return true
}
func (a *compositeMatcher) String() string {
var ret string
if a.pm != nil {
ret += a.pm.String()
}
for _, m := range a.hms {
ret += m.String()
}
if a.fm != nil {
ret += a.fm.String()
}
return ret
}
type fractionMatcher struct {
fraction int64 // real fraction is fraction/1,000,000.
}
func newFractionMatcher(fraction uint32) *fractionMatcher {
return &fractionMatcher{fraction: int64(fraction)}
}
var grpcrandInt63n = grpcrand.Int63n
func (fm *fractionMatcher) match() bool {
t := grpcrandInt63n(1000000)
return t <= fm.fraction
}
func (fm *fractionMatcher) equal(m *fractionMatcher) bool {
if fm == m {
return true
}
if fm == nil || m == nil {
return false
}
return fm.fraction == m.fraction
}
func (fm *fractionMatcher) String() string {
return fmt.Sprintf("fraction:%v", fm.fraction)
}