[feature] integrate datasource of OpenSergo by OpenSergo Go SDK

pkg/datasource/opensergo/README.md

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+# Opensergo DataSource for Sentinel Go
+
+## Prepare Environment for Test Version
+
+- Prepare the `OpenSergo GO SDK`.
+  Because of the `OpenSergo GO SDK` has no published version, so should download the sourcecode of [`OpenSergo GO SDK`](https://github.com/jnan806/opensergo-go-sdk/tree/initial-version), and move it into you `GOPATH`.
+- Rename the right version in directory name of `OpenSergo GO SDK` sourcecode. 
+  Make sure the version in sourcecode directory name is the same with go.mod.  
+  eg. `$PATH/pkg/mod/github.com/opensergo/opensergo-go@v0.0.0-20220331070310-e5b01fee4d1c`
+
+## Samples
+
+- [datasource_opensergo_example.go](./demo/datasource_opensergo_example.go)

pkg/datasource/opensergo/demo/datasource_opensergo_example.go

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+// Copyright 1999-2020 Alibaba Group Holding Ltd.
+//
+// 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 main
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"sync/atomic"
+	"time"
+
+	sentinel "github.com/alibaba/sentinel-golang/api"
+	"github.com/alibaba/sentinel-golang/core/base"
+	"github.com/alibaba/sentinel-golang/core/config"
+	_ "github.com/alibaba/sentinel-golang/ext/datasource"
+	"github.com/alibaba/sentinel-golang/logging"
+	"github.com/alibaba/sentinel-golang/pkg/datasource/opensergo"
+	_ "github.com/alibaba/sentinel-golang/pkg/datasource/opensergo"
+	"github.com/alibaba/sentinel-golang/util"
+)
+
+const (
+	host string = "127.0.0.1"
+	port uint32 = 10246
+
+	namespace string = "default"
+	app       string = "foo-app"
+)
+
+type Counter struct {
+	pass  *int64
+	block *int64
+	total *int64
+}
+
+func main() {
+	openSergoDataSource, _ := opensergo.NewOpenSergoDataSource(host, port, namespace, app)
+	openSergoDataSource.Initialize()
+
+	// simulate concurrency request
+	simulateConcurrency()
+
+	select {}
+}
+
+func simulateConcurrency() {
+	counter := Counter{pass: new(int64), block: new(int64), total: new(int64)}
+
+	// simulate request
+	go startFlowModule(&counter)
+	// print counter
+	go timerTask(&counter)
+}
+
+func startFlowModule(counter *Counter) {
+	// We should initialize Sentinel first.
+	conf := config.NewDefaultConfig()
+	// for testing, logging output to console
+	conf.Sentinel.Log.Logger = logging.NewConsoleLogger()
+	if err := sentinel.InitWithConfig(conf); err != nil {
+		log.Fatal(err)
+	}
+
+	for i := 0; i < 10; i++ {
+		go func() {
+			for {
+				e, b := sentinel.Entry("GET:/foo/1", sentinel.WithTrafficType(base.Inbound))
+				if b != nil {
+					// Blocked. We could get the block reason from the BlockError.
+					atomic.AddInt64(counter.block, 1)
+					time.Sleep(time.Duration(rand.Uint64()%10) * time.Millisecond)
+				} else {
+					// Passed, wrap the logic here.
+					atomic.AddInt64(counter.pass, 1)
+					time.Sleep(time.Duration(rand.Uint64()%10) * time.Millisecond)
+					// Be sure the entry is exited finally.
+					e.Exit()
+				}
+				atomic.AddInt64(counter.total, 1)
+			}
+		}()
+	}
+}
+
+//statistic print
+func timerTask(counter *Counter) {
+	fmt.Println("begin to statistic!!!")
+	var (
+		oldTotal, oldPass, oldBlock int64
+	)
+	for {
+		time.Sleep(1 * time.Second)
+		globalTotal := atomic.LoadInt64(counter.total)
+		oneSecondTotal := globalTotal - oldTotal
+		oldTotal = globalTotal
+
+		globalPass := atomic.LoadInt64(counter.pass)
+		oneSecondPass := globalPass - oldPass
+		oldPass = globalPass
+
+		globalBlock := atomic.LoadInt64(counter.block)
+		oneSecondBlock := globalBlock - oldBlock
+		oldBlock = globalBlock
+
+		fmt.Println(util.CurrentTimeMillis()/1000, "total:", oneSecondTotal, " pass:", oneSecondPass, " block:", oneSecondBlock)
+	}
+}

pkg/datasource/opensergo/doc.go

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+// Copyright 1999-2020 Alibaba Group Holding Ltd.
+//
+// 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 opensergo This package provides OpenSergo dynamic data-source implementation for Sentinel.
+package opensergo

pkg/datasource/opensergo/go.mod

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+module github.com/alibaba/sentinel-golang/pkg/datasource/opensergo
+
+go 1.13
+
+require (
+	github.com/alibaba/sentinel-golang v1.0.4
+	github.com/opensergo/opensergo-go v0.0.0-20230105054255-fe6fd77bd6ce
+	github.com/pkg/errors v0.9.1
+	google.golang.org/protobuf v1.27.1
+)