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degradation.go
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degradation.go
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// Copyright 2024 CloudWeGo 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 client
import (
"context"
"github.com/cloudwego/kitex/client"
"github.com/cloudwego/kitex/pkg/klog"
"github.com/kitex-contrib/config-etcd/etcd"
"github.com/kitex-contrib/config-etcd/pkg/degradation"
"github.com/kitex-contrib/config-etcd/utils"
)
func WithDegradation(dest, src string, etcdClient etcd.Client, uniqueID int64, opts utils.Options) []client.Option {
param, err := etcdClient.ClientConfigParam(&etcd.ConfigParamConfig{
Category: degradationConfigName,
ServerServiceName: dest,
ClientServiceName: src,
})
if err != nil {
panic(err)
}
for _, f := range opts.EtcdCustomFunctions {
f(¶m)
}
key := param.Prefix + "/" + param.Path
container := initDegradationOptions(key, dest, uniqueID, etcdClient)
return []client.Option{
client.WithACLRules(container.GetAclRule()),
client.WithCloseCallbacks(func() error {
// cancel the configuration listener when client is closed.
etcdClient.DeregisterConfig(key, uniqueID)
return nil
}),
}
}
func initDegradationOptions(key, dest string, uniqueID int64, etcdClient etcd.Client) *degradation.Container {
container := degradation.NewContainer()
onChangeCallback := func(restoreDefault bool, data string, parser etcd.ConfigParser) {
config := °radation.Config{}
if !restoreDefault {
err := parser.Decode(data, config)
if err != nil {
klog.Warnf("[etcd] %s server etcd degradation config: unmarshal data %s failed: %s, skip...", key, data, err)
return
}
}
container.NotifyPolicyChange(config)
}
etcdClient.RegisterConfigCallback(context.Background(), key, uniqueID, onChangeCallback)
return container
}