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Move function which generated composite URLMap to translator pkg
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,123 @@ | ||
| /* | ||
| Copyright 2020 The Kubernetes 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. | ||
| */ | ||
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| package translator | ||
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| import ( | ||
| "crypto/md5" | ||
| "encoding/hex" | ||
| "fmt" | ||
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| "github.com/GoogleCloudPlatform/k8s-cloud-provider/pkg/cloud" | ||
| "github.com/GoogleCloudPlatform/k8s-cloud-provider/pkg/cloud/meta" | ||
| "k8s.io/ingress-gce/pkg/composite" | ||
| "k8s.io/ingress-gce/pkg/utils" | ||
| "k8s.io/ingress-gce/pkg/utils/namer" | ||
| ) | ||
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| // The gce api uses the name of a path rule to match a host rule. | ||
| const hostRulePrefix = "host" | ||
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| // ToCompositeURLMap translates the given hostname: endpoint->port mapping into a gce url map. | ||
| // | ||
| // HostRule: Conceptually contains all PathRules for a given host. | ||
| // PathMatcher: Associates a path rule with a host rule. Mostly an optimization. | ||
| // PathRule: Maps a single path regex to a backend. | ||
| // | ||
| // The GCE url map allows multiple hosts to share url->backend mappings without duplication, eg: | ||
| // Host: foo(PathMatcher1), bar(PathMatcher1,2) | ||
| // PathMatcher1: | ||
| // /a -> b1 | ||
| // /b -> b2 | ||
| // PathMatcher2: | ||
| // /c -> b1 | ||
| // This leads to a lot of complexity in the common case, where all we want is a mapping of | ||
| // host->{/path: backend}. | ||
| // | ||
| // Consider some alternatives: | ||
| // 1. Using a single backend per PathMatcher: | ||
| // Host: foo(PathMatcher1,3) bar(PathMatcher1,2,3) | ||
| // PathMatcher1: | ||
| // /a -> b1 | ||
| // PathMatcher2: | ||
| // /c -> b1 | ||
| // PathMatcher3: | ||
| // /b -> b2 | ||
| // 2. Using a single host per PathMatcher: | ||
| // Host: foo(PathMatcher1) | ||
| // PathMatcher1: | ||
| // /a -> b1 | ||
| // /b -> b2 | ||
| // Host: bar(PathMatcher2) | ||
| // PathMatcher2: | ||
| // /a -> b1 | ||
| // /b -> b2 | ||
| // /c -> b1 | ||
| // In the context of kubernetes services, 2 makes more sense, because we | ||
| // rarely want to lookup backends (service:nodeport). When a service is | ||
| // deleted, we need to find all host PathMatchers that have the backend | ||
| // and remove the mapping. When a new path is added to a host (happens | ||
| // more frequently than service deletion) we just need to lookup the 1 | ||
| // pathmatcher of the host. | ||
| func ToCompositeURLMap(g *utils.GCEURLMap, namer namer.IngressFrontendNamer, key *meta.Key) *composite.UrlMap { | ||
| defaultBackendName := g.DefaultBackend.BackendName() | ||
| key.Name = defaultBackendName | ||
| resourceID := cloud.ResourceID{ProjectID: "", Resource: "backendServices", Key: key} | ||
| m := &composite.UrlMap{ | ||
| Name: namer.UrlMap(), | ||
| DefaultService: resourceID.ResourcePath(), | ||
| } | ||
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| for _, hostRule := range g.HostRules { | ||
| // Create a host rule | ||
| // Create a path matcher | ||
| // Add all given endpoint:backends to pathRules in path matcher | ||
| pmName := getNameForPathMatcher(hostRule.Hostname) | ||
| m.HostRules = append(m.HostRules, &composite.HostRule{ | ||
| Hosts: []string{hostRule.Hostname}, | ||
| PathMatcher: pmName, | ||
| }) | ||
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| pathMatcher := &composite.PathMatcher{ | ||
| Name: pmName, | ||
| DefaultService: m.DefaultService, | ||
| PathRules: []*composite.PathRule{}, | ||
| } | ||
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| // GCE ensures that matched rule with longest prefix wins. | ||
| for _, rule := range hostRule.Paths { | ||
| beName := rule.Backend.BackendName() | ||
| key.Name = beName | ||
| resourceID := cloud.ResourceID{ProjectID: "", Resource: "backendServices", Key: key} | ||
| beLink := resourceID.ResourcePath() | ||
| pathMatcher.PathRules = append(pathMatcher.PathRules, &composite.PathRule{ | ||
| Paths: []string{rule.Path}, | ||
| Service: beLink, | ||
| }) | ||
| } | ||
| m.PathMatchers = append(m.PathMatchers, pathMatcher) | ||
| } | ||
| return m | ||
| } | ||
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| // getNameForPathMatcher returns a name for a pathMatcher based on the given host rule. | ||
| // The host rule can be a regex, the path matcher name used to associate the 2 cannot. | ||
| func getNameForPathMatcher(hostRule string) string { | ||
| hasher := md5.New() | ||
| hasher.Write([]byte(hostRule)) | ||
| return fmt.Sprintf("%v%v", hostRulePrefix, hex.EncodeToString(hasher.Sum(nil))) | ||
| } | ||
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