dubbo.apache.org/dubbo-go/v3@v3.1.1/registry/polaris/listener.go (about)

     1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   * contributor license agreements.  See the NOTICE file distributed with
     4   * this work for additional information regarding copyright ownership.
     5   * The ASF licenses this file to You under the Apache License, Version 2.0
     6   * (the "License"); you may not use this file except in compliance with
     7   * the License.  You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  
    18  package polaris
    19  
    20  import (
    21  	"fmt"
    22  	"net/url"
    23  	"strconv"
    24  )
    25  
    26  import (
    27  	gxchan "github.com/dubbogo/gost/container/chan"
    28  	"github.com/dubbogo/gost/log/logger"
    29  
    30  	perrors "github.com/pkg/errors"
    31  
    32  	"github.com/polarismesh/polaris-go/pkg/model"
    33  )
    34  
    35  import (
    36  	"dubbo.apache.org/dubbo-go/v3/common"
    37  	"dubbo.apache.org/dubbo-go/v3/common/constant"
    38  	"dubbo.apache.org/dubbo-go/v3/config_center"
    39  	"dubbo.apache.org/dubbo-go/v3/registry"
    40  	"dubbo.apache.org/dubbo-go/v3/remoting"
    41  )
    42  
    43  type polarisListener struct {
    44  	watcher *PolarisServiceWatcher
    45  	events  *gxchan.UnboundedChan
    46  	closeCh chan struct{}
    47  }
    48  
    49  // NewPolarisListener new polaris listener
    50  func NewPolarisListener(watcher *PolarisServiceWatcher) (*polarisListener, error) {
    51  	listener := &polarisListener{
    52  		watcher: watcher,
    53  		events:  gxchan.NewUnboundedChan(32),
    54  		closeCh: make(chan struct{}),
    55  	}
    56  	listener.startListen()
    57  	return listener, nil
    58  }
    59  func (pl *polarisListener) startListen() {
    60  	pl.watcher.AddSubscriber(func(et remoting.EventType, ins []model.Instance) {
    61  		for i := range ins {
    62  			pl.events.In() <- &config_center.ConfigChangeEvent{Value: ins[i], ConfigType: et}
    63  		}
    64  	})
    65  }
    66  
    67  // Next returns next service event once received
    68  func (pl *polarisListener) Next() (*registry.ServiceEvent, error) {
    69  	for {
    70  		select {
    71  		case <-pl.closeCh:
    72  			logger.Warnf("polaris listener is close")
    73  			return nil, perrors.New("listener stopped")
    74  		case val := <-pl.events.Out():
    75  			e, _ := val.(*config_center.ConfigChangeEvent)
    76  			logger.Debugf("got polaris event %s", e)
    77  			instance := e.Value.(model.Instance)
    78  			return &registry.ServiceEvent{Action: e.ConfigType, Service: generateUrl(instance)}, nil
    79  		}
    80  	}
    81  }
    82  
    83  // Close closes this listener
    84  func (pl *polarisListener) Close() {
    85  	// TODO need to add UnWatch in polaris
    86  	close(pl.closeCh)
    87  }
    88  
    89  func generateUrl(instance model.Instance) *common.URL {
    90  	if instance.GetMetadata() == nil {
    91  		logger.Errorf("polaris instance metadata is empty,instance:%+v", instance)
    92  		return nil
    93  	}
    94  	path := instance.GetMetadata()["path"]
    95  	myInterface := instance.GetMetadata()["interface"]
    96  	if len(path) == 0 && len(myInterface) == 0 {
    97  		logger.Errorf("polaris instance metadata does not have  both path key and interface key,instance:%+v", instance)
    98  		return nil
    99  	}
   100  	if len(path) == 0 && len(myInterface) != 0 {
   101  		path = "/" + myInterface
   102  	}
   103  	protocol := instance.GetProtocol()
   104  	if len(protocol) == 0 {
   105  		logger.Errorf("polaris instance metadata does not have protocol key,instance:%+v", instance)
   106  		return nil
   107  	}
   108  	urlMap := url.Values{}
   109  	for k, v := range instance.GetMetadata() {
   110  		urlMap.Set(k, v)
   111  	}
   112  	urlMap.Set(constant.PolarisInstanceID, instance.GetId())
   113  	urlMap.Set(constant.PolarisInstanceHealthStatus, fmt.Sprintf("%+v", instance.IsHealthy()))
   114  	urlMap.Set(constant.PolarisInstanceIsolatedStatus, fmt.Sprintf("%+v", instance.IsIsolated()))
   115  	instance.GetCircuitBreakerStatus()
   116  	return common.NewURLWithOptions(
   117  		common.WithIp(instance.GetHost()),
   118  		common.WithPort(strconv.Itoa(int(instance.GetPort()))),
   119  		common.WithProtocol(protocol),
   120  		common.WithParams(urlMap),
   121  		common.WithPath(path),
   122  	)
   123  }