| // Licensed to Apache Software Foundation (ASF) under one or more contributor |
| // license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright |
| // ownership. Apache Software Foundation (ASF) licenses this file to you 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 resolvers |
| |
| import ( |
| "context" |
| "encoding/json" |
| "fmt" |
| |
| "google.golang.org/grpc/resolver" |
| |
| "github.com/apache/skywalking-satellite/internal/pkg/log" |
| ) |
| |
| var kubernetesServerSchema = "kubernetes" |
| |
| type kubernetesServerResolver struct { |
| } |
| |
| func (k *kubernetesServerResolver) IsSupport(c *ServerFinderConfig) bool { |
| return c.KubernetesConfig != nil |
| } |
| |
| func (k *kubernetesServerResolver) BuildTarget(c *ServerFinderConfig) (string, error) { |
| marshal, err := json.Marshal(c.KubernetesConfig) |
| if err != nil { |
| return "", fmt.Errorf("convert kubernetes config error: %v", err) |
| } |
| return fmt.Sprintf("%s:///%s", kubernetesServerSchema, string(marshal)), nil |
| } |
| |
| func (*kubernetesServerResolver) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) { |
| // convert data |
| kubernetesConfig := &KubernetesConfig{} |
| if err := json.Unmarshal([]byte(target.Endpoint), kubernetesConfig); err != nil { |
| return nil, fmt.Errorf("could not analyze the address: %v", err) |
| } |
| |
| // validate http config |
| if kubernetesConfig.APIServer != "" { |
| httpConfig, err := kubernetesConfig.HTTPClientConfig.convertHTTPConfig() |
| if err != nil { |
| return nil, err |
| } |
| if err = httpConfig.Validate(); err != nil { |
| return nil, fmt.Errorf("http config validate error: %v", err) |
| } |
| } |
| |
| // init cache |
| ctx, cancel := context.WithCancel(context.Background()) |
| cache, err := NewKindCache(ctx, kubernetesConfig, cc) |
| if err != nil { |
| cancel() |
| return nil, err |
| } |
| |
| // build resolver |
| r := &kubernetesResolver{ |
| cache: cache, |
| cancel: cancel, |
| } |
| return r, nil |
| } |
| |
| func (*kubernetesServerResolver) Scheme() string { |
| return kubernetesServerSchema |
| } |
| |
| type kubernetesResolver struct { |
| cache *KindCache |
| cancel context.CancelFunc |
| } |
| |
| func (k *kubernetesResolver) ResolveNow(o resolver.ResolveNowOptions) { |
| if err := k.cache.UpdateAddresses(); err != nil { |
| log.Logger.Warnf("error update static grpc client list: %v", err) |
| } |
| } |
| |
| func (k *kubernetesResolver) Close() { |
| k.cancel() |
| } |