github.com/imran-kn/cilium-fork@v1.6.9/pkg/policy/api/groups.go (about)

     1  // Copyright 2018 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package api
    16  
    17  import (
    18  	"fmt"
    19  	"net"
    20  	"sync"
    21  
    22  	"github.com/cilium/cilium/pkg/ip"
    23  )
    24  
    25  const (
    26  	AWSProvider = "AWS" // AWS provider key
    27  )
    28  
    29  var (
    30  	providers = sync.Map{} // map with the list of providers to callback to retrive info from.
    31  )
    32  
    33  // GroupProviderFunc is a func that need to be register to be able to
    34  // register a new provider in the platform.
    35  type GroupProviderFunc func(*ToGroups) ([]net.IP, error)
    36  
    37  // ToGroups structure to store all kinds of new integrations that needs a new
    38  // derivative policy.
    39  type ToGroups struct {
    40  	AWS *AWSGroup `json:"aws,omitempty"`
    41  }
    42  
    43  // AWSGroup is an structure that can be used to whitelisting information from AWS integration
    44  type AWSGroup struct {
    45  	Labels              map[string]string `json:"labels,omitempty"`
    46  	SecurityGroupsIds   []string          `json:"securityGroupsIds,omitempty"`
    47  	SecurityGroupsNames []string          `json:"securityGroupsNames,omitempty"`
    48  	Region              string            `json:"region,omitempty"`
    49  }
    50  
    51  // RegisterToGroupsProvider it will register a new callback that will be used
    52  // when a new ToGroups rule is added.
    53  func RegisterToGroupsProvider(providerName string, callback GroupProviderFunc) {
    54  	providers.Store(providerName, callback)
    55  }
    56  
    57  // GetCidrSet will return the CIDRRule for the rule using the callbacks that
    58  // are register in the platform.
    59  func (group *ToGroups) GetCidrSet() ([]CIDRRule, error) {
    60  
    61  	var ips []net.IP
    62  	// Get per  provider CIDRSet
    63  	if group.AWS != nil {
    64  		callbackInterface, ok := providers.Load(AWSProvider)
    65  		if !ok {
    66  			return nil, fmt.Errorf("Provider %s is not registered", AWSProvider)
    67  		}
    68  		callback, ok := callbackInterface.(GroupProviderFunc)
    69  		if !ok {
    70  			return nil, fmt.Errorf("Provider callback for %s is not a valid instance", AWSProvider)
    71  		}
    72  		awsIPs, err := callback(group)
    73  		if err != nil {
    74  			return nil, fmt.Errorf(
    75  				"Cannot retrieve data from %s provider: %s",
    76  				AWSProvider, err)
    77  		}
    78  		ips = append(ips, awsIPs...)
    79  	}
    80  
    81  	resultIps := ip.KeepUniqueIPs(ips)
    82  	return IPsToCIDRRules(resultIps), nil
    83  }