| // 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 ( |
| "fmt" |
| "strings" |
| |
| "github.com/apache/skywalking-satellite/internal/pkg/log" |
| |
| "google.golang.org/grpc/resolver" |
| ) |
| |
| var staticServerSchema = "static" |
| |
| type staticServerResolver struct { |
| } |
| |
| func (s *staticServerResolver) IsSupport(c *ServerFinderConfig) bool { |
| return c.KubernetesConfig == nil && c.ServerAddr != "" |
| } |
| |
| func (s *staticServerResolver) BuildTarget(c *ServerFinderConfig) (string, error) { |
| // build target using uri endpoint |
| return fmt.Sprintf("%s:///%s", staticServerSchema, c.ServerAddr), nil |
| } |
| |
| func (*staticServerResolver) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) { |
| r := &staticResolver{ |
| target: target, |
| cc: cc, |
| } |
| r.analyzeClients() |
| return r, nil |
| } |
| |
| func (*staticServerResolver) Scheme() string { |
| return staticServerSchema |
| } |
| |
| type staticResolver struct { |
| target resolver.Target |
| cc resolver.ClientConn |
| } |
| |
| func (r *staticResolver) ResolveNow(o resolver.ResolveNowOptions) { |
| r.analyzeClients() |
| } |
| |
| func (*staticResolver) Close() { |
| } |
| |
| func (r *staticResolver) analyzeClients() { |
| addresses := strings.Split(r.target.Endpoint, ",") |
| addrs := make([]resolver.Address, len(addresses)) |
| for i, s := range addresses { |
| addrs[i] = resolver.Address{Addr: s} |
| } |
| if err := r.cc.UpdateState(resolver.State{Addresses: addrs}); err != nil { |
| log.Logger.Warnf("error update static grpc client list: %v", err) |
| } |
| } |