Class: CfnManage::StartStopHandler::EcsCluster

Inherits:
Object
  • Object
show all
Defined in:
lib/cfn_manage/handlers/ecs_cluster.rb

Instance Method Summary collapse

Constructor Details

#initialize(cluster_id, options = {}) ⇒ EcsCluster

Returns a new instance of EcsCluster.



8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 8

def initialize(cluster_id, options = {})
  @wait_state = options.has_key?(:wait_state) ? options[:wait_state] : CfnManage.ecs_wait_state
  @skip_wait = options.has_key?(:skip_wait) ? CfnManage.true?(options[:skip_wait]) : CfnManage.skip_wait? 
  @wait_container_instances = options.has_key?(:wait_container_instances) ? CfnManage.true?(options[:wait_container_instances]) : CfnManage.ecs_wait_container_instances? 
  @ignore_missing_ecs_config = options.has_key?(:ignore_missing_ecs_config) ? CfnManage.true?(options[:ignore_missing_ecs_config]) : CfnManage.ignore_missing_ecs_config?
  
  credentials = CfnManage::AWSCredentials.get_session_credentials("stoprun_#{cluster_id}")
  @ecs_client = Aws::ECS::Client.new(credentials: credentials, retry_limit: 20)
  @elb_client = Aws::ElasticLoadBalancingV2::Client.new(credentials: credentials, retry_limit: 20)
  @services = []
  @ecs_client.list_services(cluster: cluster_id, scheduling_strategy: 'REPLICA', max_results: 100).each do |results|
    @services.push(*results.service_arns)
  end
  $log.info("Found #{@services.count} services in ECS cluster #{cluster_id}")
  @cluster = cluster_id
end

Instance Method Details

#start(configuration) ⇒ Object 



25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
 
# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 25

def start(configuration)
  if @wait_container_instances
    wait_for_instances()
  end
  
  @services.each do |service_arn|

    $log.info("Searching for ECS service #{service_arn} in cluster #{@cluster}")
    service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first

    if service.desired_count != 0
      $log.info("ECS service #{service.service_name} is already running")
      next
    end

    if configuration.has_key?(service.service_name)
      desired_count = configuration[service.service_name].has_key?('desired_count') ? configuration[service.service_name]['desired_count'] : 0
      if desired_count == 0
        $log.info("Desired count is #{desired_count}, skipping starting of service #{service.service_name}")
        next
      end
    elsif CfnManage.ignore_missing_ecs_config?
      $log.info("ECS service #{service.service_name} wasn't previously stopped by cfn_manage. Option --ignore-missing-ecs-config set and setting desired count to 1")
      desired_count = 1
    else
      $log.warn("ECS service #{service.service_name} wasn't previously stopped by cfn_manage. Skipping ...")
      next
    end

    $log.info("Starting ECS service #{service.service_name} with desired count of #{desired_count}")
    @ecs_client.update_service({
      desired_count: desired_count,
      service: service_arn,
      cluster: @cluster
    })

  end

  if !@skip_wait
    @services.each do |service_arn|
      service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first

      if service.desired_count == 0
        $log.info("ECS service #{service.service_name} was not started so will not wait for it")
        next
      end
      
      wait(@wait_state,service_arn)
    end
  end
  
end

#stop ⇒ Object 



78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
 
# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 78

def stop
  configuration = {}
  @services.each do |service_arn|

    $log.info("Searching for ECS service #{service_arn} in cluster #{@cluster}")
    service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first

    if service.desired_count == 0
      $log.info("ECS service #{service.service_name} is already stopped")
      next
    end

    configuration[service.service_name] = { desired_count: service.desired_count }
    $log.info("Stopping ECS service #{service.service_name}")
    @ecs_client.update_service({
      desired_count: 0,
      service: service_arn,
      cluster: @cluster
    })

  end

  return configuration.empty? ? nil : configuration
end

#wait(type, service_arn = nil) ⇒ Object 



103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 103

def wait(type,service_arn=nil)
  
  if service_arn.nil?
    $log.warn("Unable to wait for #{service_arn} service")
    return
  end
  
  attempts = 0
  
  until attempts == (max_attempts = 60*6) do
    
    case type
    when 'Running'
      success = wait_till_running(service_arn)
    when 'HealthyInTargetGroup'
      success = wait_till_healthy_in_target_group(service_arn)
    when 'Skip'
      $log.info("Skipping wait for #{service_arn} service")
      break
    else
      $log.warn("Unknown ECS service wait type #{type}. Skipping...")
      break
    end
    
    if success
      break
    end
    
    attempts = attempts + 1
    sleep(15)
  end

  if attempts == max_attempts
    $log.error("Failed to wait for ecs service with wait type #{type}")
  end
end

#wait_for_instances ⇒ Object 



140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
 
# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 140

def wait_for_instances
  
  attempts = 0
  
  until attempts == (max_attempts = 60*3) do
    
    resp = @ecs_client.list_container_instances({
      cluster: @cluster,
      status: "ACTIVE"
    })
    
    if resp.container_instance_arns.any?
      $log.info("A container instances has joined ecs cluster #{@cluster}")
      break
    end
    
    attempts = attempts + 1
    sleep(5)
  end

  if attempts == max_attempts
    $log.error("Failed to wait for container instances to join ecs cluster #{@cluster}")
  end
end

#wait_till_healthy_in_target_group(service_arn) ⇒ Object 



178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
 
# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 178

def wait_till_healthy_in_target_group(service_arn)
  service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first
  target_groups = service.load_balancers.collect { |lb| lb.target_group_arn }
  
  if target_groups.empty?
    # we want to skip here if the asg is not associated with any target groups
    $log.info("ecs aervice #{service_arn} is not associated with any target groups")
    return true
  end
  
  target_health = []
  target_groups.each do |tg| 
    resp = @elb_client.describe_target_health({
      target_group_arn: tg, 
    })
    if resp.target_health_descriptions.empty?
      # we need to wait until a ecs task has been placed into the target group
      # before we can check it's healthy
      $log.info("ECS service #{service_arn} hasn't been placed into target group #{tg.split('/')[1]} yet")
      return false
    end
    target_health.push(*resp.target_health_descriptions)
  end
        
  state = target_health.collect {|tg| tg.target_health.state}
          
  if state.all? 'healthy'
    $log.info("All ecs tasks are in a healthy state in target groups #{target_groups.map {|tg| tg.split('/')[1] }}")
    return true
  end
  
  unhealthy = target_health.select {|tg| tg.target_health.state != 'healthy'}
  unhealthy.each do |tg|
    $log.info("waiting for ecs task #{tg.target.id} to be healthy in target group. Current state is #{tg.target_health.state}")
  end
  
  return false
end

#wait_till_running(service_arn) ⇒ Object 



165
166
167
168
169
170
171
172
173
174
175
176
 
# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 165

def wait_till_running(service_arn)
  service_name = service_arn.split('/').last
  service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first
          
  if service.running_count > 0
    $log.info("ecs service #{service_name} has #{service.running_count} running tasks")
    return true
  end  
  
  $log.info("waiting for ecs service #{service_name} to reach a running state")
  return false
end