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config.go
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config.go
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// Copyright 2022 Douyu
//
// 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 sentinel
import (
"encoding/json"
"fmt"
sentinel "github.com/alibaba/sentinel-golang/api"
"github.com/alibaba/sentinel-golang/core/base"
"github.com/alibaba/sentinel-golang/core/circuitbreaker"
"github.com/alibaba/sentinel-golang/core/config"
"github.com/alibaba/sentinel-golang/core/flow"
"github.com/alibaba/sentinel-golang/core/system"
"github.com/alibaba/sentinel-golang/ext/datasource"
"github.com/douyu/jupiter/pkg"
"github.com/douyu/jupiter/pkg/client/etcdv3"
"github.com/douyu/jupiter/pkg/conf"
"github.com/douyu/jupiter/pkg/core/constant"
"github.com/douyu/jupiter/pkg/xlog"
clientv3 "go.etcd.io/etcd/client/v3"
"go.uber.org/zap"
)
type Config struct {
Enable bool `toml:"enable"`
Datasource string `toml:"datasource"`
EtcdRawKey string `toml:"etcdRawKey"`
// 熔断降级
CbKey string `toml:"cbKey"`
CbRules []*CircuitBreakerRule `toml:"cbRules"`
// 流量控制
FlowKey string `toml:"flowKey"`
FlowRules []*flow.Rule `toml:"flowRules"`
// 系统保护
SystemKey string `toml:"systemKey"`
SystemRules []*system.Rule `toml:"systemRules"`
}
func StdConfig() Config {
return RawConfig(constant.ConfigKey("sentinel"))
}
func RawConfig(key string) Config {
config := DefaultConfig()
if conf.Get(constant.ConfigKey("sentinel")) == nil {
return config
}
if err := conf.UnmarshalKey(key, &config, conf.TagName("toml")); err != nil {
xlog.Jupiter().Warn("unmarshal config", zap.String("key", key), zap.Error(err))
return config
}
return config
}
func DefaultConfig() Config {
return Config{
Enable: false,
Datasource: SENTINEL_DATASOURCE_ETCD,
EtcdRawKey: "app.registry.etcd",
// 熔断降级规则 /wsd-sentinel/{language}/{app}/{idc}/{env}/{ruleType}=${value}
CbKey: "/wsd-sentinel/go/%s/%s/%s/degrade",
// 流量控制规则 /wsd-sentinel/{language}/{app}/{idc}/{env}/{ruleType}=${value}
FlowKey: "/wsd-sentinel/go/%s/%s/%s/flow",
// 系统保护规则 /wsd-sentinel/{language}/{app}/{idc}/{env}/{ruleType}=${value}
SystemKey: "/wsd-sentinel/go/%s/%s/%s/system",
}
}
func (e Config) exitHandler(entry *SentinelEntry, ctx *EntryContext) error {
if ctx.Err() != nil {
sentinelExceptionsThrown.WithLabelValues(labels(entry.Resource().Name())...).Inc()
} else {
sentinelSuccess.WithLabelValues(labels(entry.Resource().Name())...).Inc()
}
sentinelRt.WithLabelValues(labels(entry.Resource().Name())...).Observe(float64(ctx.Rt()) / 1000)
return ctx.Err()
}
func (c Config) Entry(resource string, opts ...EntryOption) (*SentinelEntry, *BlockError) {
if !c.Enable {
return base.NewSentinelEntry(nil, nil, nil), nil
}
a, b := sentinel.Entry(resource, opts...)
sentinelReqeust.WithLabelValues(labels(resource)...).Inc()
if b != nil {
sentinelBlocked.WithLabelValues(labels(resource)...).Inc()
return a, b
}
a.WhenExit(c.exitHandler)
return a, b
}
func (c Config) Build() error {
if !c.Enable {
xlog.Jupiter().Info("disable sentinel feature")
return nil
}
if err := sentinel.InitDefault(); err != nil {
xlog.Jupiter().Error("sentinel.InitDefault failed", zap.Error(err))
return err
}
defaultConfig := config.NewDefaultConfig()
defaultConfig.Sentinel.App.Name = pkg.Name()
err := sentinel.InitWithConfig(defaultConfig)
if err != nil {
return err
}
circuitbreaker.RegisterStateChangeListeners(&stateChangeTestListener{})
c.loadRules()
return nil
}
func (c Config) loadRules() {
xlog.Jupiter().Info("load sentinel rules", zap.String("datasource", c.Datasource))
switch c.Datasource {
case SENTINEL_DATASOURCE_ETCD:
cli, err := etcdv3.RawConfig(c.EtcdRawKey).Singleton()
if err != nil {
panic(err)
}
err = initRules(cli.Client, c.CbKey, datasource.NewCircuitBreakerRulesHandler(circuitBreakerRuleJsonArrayParser))
if err != nil {
xlog.Jupiter().Warn("sentinel etcd Initialize failed", xlog.FieldErr(err))
}
err = initRules(cli.Client, c.SystemKey, datasource.NewSystemRulesHandler(datasource.SystemRuleJsonArrayParser))
if err != nil {
xlog.Jupiter().Warn("sentinel etcd Initialize failed", xlog.FieldErr(err))
}
err = initRules(cli.Client, c.FlowKey, datasource.NewFlowRulesHandler(datasource.FlowRuleJsonArrayParser))
if err != nil {
xlog.Jupiter().Warn("sentinel etcd Initialize failed", xlog.FieldErr(err))
}
default:
var err error
_, err = flow.LoadRules(c.FlowRules)
if err != nil {
xlog.Jupiter().Warn("sentinel flow.LoadRules failed", xlog.FieldErr(err))
}
_, err = system.LoadRules(c.SystemRules)
if err != nil {
xlog.Jupiter().Warn("sentinel system.LoadRules failed", xlog.FieldErr(err))
}
rules := convertCbRules(c.CbRules)
_, err = circuitbreaker.LoadRules(rules)
if err != nil {
xlog.Jupiter().Warn("sentinel circuitbreaker.LoadRules failed", xlog.FieldErr(err))
}
}
}
func checkSrcComplianceJson(src []byte) (bool, error) {
if len(src) == 0 {
return false, nil
}
return true, nil
}
func initRules(client *clientv3.Client, key string, h datasource.PropertyHandler) error {
datasource, err := newDataSource(client,
fmt.Sprintf(key, pkg.Name(), pkg.AppZone(), conf.GetString("app.mode")),
h)
if err != nil {
return err
}
return datasource.Initialize()
}
func circuitBreakerRuleJsonArrayParser(src []byte) (interface{}, error) {
if valid, err := checkSrcComplianceJson(src); !valid {
return nil, err
}
rules := make([]*CircuitBreakerRule, 0, 8)
if err := json.Unmarshal(src, &rules); err != nil {
desc := fmt.Sprintf("Fail to convert source bytes to []*CircuitBreakerRule, err: %s", err.Error())
xlog.Jupiter().Warn("json.Unmarshal", zap.ByteString("src", src), zap.Error(err))
return nil, datasource.NewError(datasource.ConvertSourceError, desc)
}
xlog.Jupiter().Info("circuitBreakerRuleJsonArrayParser finished", zap.Any("rules", rules))
return convertCbRules(rules), nil
}