sigs.k8s.io/external-dns@v0.14.1/source/connector.go (about)

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package source
    18  
    19  import (
    20  	"context"
    21  	"encoding/gob"
    22  	"net"
    23  	"time"
    24  
    25  	log "github.com/sirupsen/logrus"
    26  
    27  	"sigs.k8s.io/external-dns/endpoint"
    28  )
    29  
    30  const (
    31  	dialTimeout = 30 * time.Second
    32  )
    33  
    34  // connectorSource is an implementation of Source that provides endpoints by connecting
    35  // to a remote tcp server. The encoding/decoding is done using encoder/gob package.
    36  type connectorSource struct {
    37  	remoteServer string
    38  }
    39  
    40  // NewConnectorSource creates a new connectorSource with the given config.
    41  func NewConnectorSource(remoteServer string) (Source, error) {
    42  	return &connectorSource{
    43  		remoteServer: remoteServer,
    44  	}, nil
    45  }
    46  
    47  // Endpoints returns endpoint objects.
    48  func (cs *connectorSource) Endpoints(ctx context.Context) ([]*endpoint.Endpoint, error) {
    49  	endpoints := []*endpoint.Endpoint{}
    50  
    51  	conn, err := net.DialTimeout("tcp", cs.remoteServer, dialTimeout)
    52  	if err != nil {
    53  		log.Errorf("Connection error: %v", err)
    54  		return nil, err
    55  	}
    56  	defer conn.Close()
    57  
    58  	decoder := gob.NewDecoder(conn)
    59  	if err := decoder.Decode(&endpoints); err != nil {
    60  		log.Errorf("Decode error: %v", err)
    61  		return nil, err
    62  	}
    63  
    64  	log.Debugf("Received endpoints: %#v", endpoints)
    65  
    66  	return endpoints, nil
    67  }
    68  
    69  func (cs *connectorSource) AddEventHandler(ctx context.Context, handler func()) {
    70  }