| // 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" |
| "fmt" |
| "net/url" |
| |
| "github.com/prometheus/prometheus/discovery" |
| |
| "github.com/apache/skywalking-satellite/internal/pkg/log" |
| |
| "google.golang.org/grpc/resolver" |
| |
| "github.com/prometheus/common/config" |
| "github.com/prometheus/prometheus/discovery/kubernetes" |
| "github.com/prometheus/prometheus/discovery/targetgroup" |
| ) |
| |
| var analyzers = []KindAddressAnalyzer{ |
| &PodAnalyzer{}, |
| &ServiceAnalyzer{}, |
| &EndpointsAnalyzer{}, |
| } |
| |
| type KindCache struct { |
| config *KubernetesConfig |
| cache map[string]*targetgroup.Group |
| cc resolver.ClientConn |
| analyzer KindAddressAnalyzer |
| } |
| |
| type KindAddressAnalyzer interface { |
| KindType() string |
| GetAddresses(cache map[string]*targetgroup.Group, config *KubernetesConfig) []string |
| } |
| |
| func NewKindCache(ctx context.Context, c *KubernetesConfig, cc resolver.ClientConn) (*KindCache, error) { |
| // build config |
| conf := &kubernetes.SDConfig{} |
| if c.APIServer != "" { |
| parsed, err := url.Parse(c.APIServer) |
| if err != nil { |
| return nil, err |
| } |
| conf.APIServer = config.URL{URL: parsed} |
| httpConfig, err := c.HTTPClientConfig.convertHTTPConfig() |
| if err != nil { |
| return nil, err |
| } |
| conf.HTTPClientConfig = *httpConfig |
| } |
| |
| conf.Role = kubernetes.Role(c.Kind) |
| conf.NamespaceDiscovery = kubernetes.NamespaceDiscovery{ |
| Names: c.Namespaces, |
| } |
| conf.Selectors = []kubernetes.SelectorConfig{ |
| { |
| Role: kubernetes.Role(c.Kind), |
| Label: c.Selector.Label, |
| Field: c.Selector.Field, |
| }, |
| } |
| |
| // build discovery |
| discoverer, err := kubernetes.New(&logAdapt{}, conf) |
| if err != nil { |
| return nil, err |
| } |
| |
| // build analyzer |
| var analyzer KindAddressAnalyzer |
| for _, a := range analyzers { |
| if a.KindType() == c.Kind { |
| analyzer = a |
| } |
| } |
| if analyzer == nil { |
| return nil, fmt.Errorf("could not kind analyzer: %s", c.Kind) |
| } |
| |
| // build and start watch |
| kind := &KindCache{config: c, cc: cc, analyzer: analyzer} |
| kind.watchAndUpdate(ctx, discoverer) |
| return kind, nil |
| } |
| |
| func (w *KindCache) watchAndUpdate(ctx context.Context, discoverer discovery.Discoverer) { |
| ch := make(chan []*targetgroup.Group) |
| go discoverer.Run(ctx, ch) |
| |
| w.cache = make(map[string]*targetgroup.Group) |
| go func() { |
| for { |
| select { |
| case tgs := <-ch: |
| for _, tg := range tgs { |
| if tg.Targets == nil || len(tg.Targets) == 0 { |
| delete(w.cache, tg.Source) |
| continue |
| } |
| w.cache[tg.Source] = tg |
| |
| // dynamic update addresses |
| if err := w.UpdateAddresses(); err != nil { |
| log.Logger.Warnf("dynamic update addresss failure, %v", err) |
| } |
| } |
| case <-ctx.Done(): |
| break |
| } |
| } |
| }() |
| } |
| |
| func (w *KindCache) UpdateAddresses() error { |
| addresses := w.analyzer.GetAddresses(w.cache, w.config) |
| addrs := make([]resolver.Address, len(addresses)) |
| for i, s := range addresses { |
| addrs[i] = resolver.Address{Addr: s} |
| } |
| if err := w.cc.UpdateState(resolver.State{Addresses: addrs}); err != nil { |
| return err |
| } |
| log.Logger.Infof("update grpc client addresses: %v", addresses) |
| return nil |
| } |
| |
| type logAdapt struct { |
| } |
| |
| func (l *logAdapt) Log(keyvals ...interface{}) error { |
| log.Logger.Print(keyvals...) |
| return nil |
| } |