Class: Automan::ElastiCache::Router

Inherits:
Base
  • Object
show all
Defined in:
lib/automan/elasticache/router.rb

Constant Summary

Constants included from Mixins::AwsCaller

Mixins::AwsCaller::S3_PROTO

Instance Attribute Summary

Attributes inherited from Base

#logger, #wait

Attributes included from Mixins::AwsCaller

#as, #cfn, #eb, #ec, #ec2, #elb, #r53, #rds, #s3

Instance Method Summary collapse

Methods inherited from Base

add_option, #initialize, #log_options, #wait_until

Methods included from Mixins::AwsCaller

#account, #configure_aws, #looks_like_s3_path?, #parse_s3_path, #s3_object_exists?, #s3_read

Constructor Details

This class inherits a constructor from Automan::Base

Instance Method Details

#node_name_from_elasticache_environment(env) ⇒ Object 



10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
 
# File 'lib/automan/elasticache/router.rb', line 10

def node_name_from_elasticache_environment(env)

  opts = {
    cache_cluster_id: "redis-#{env}",
    show_cache_node_info: true
  }

  response = ec.client.describe_cache_clusters opts

  unless response.successful?
    raise RequestFailedError, "describe_cache_clusters failed: #{response.error}"
  end

  cluster=response.data[:cache_clusters]
  if cluster.empty?
    return nil
  end

  nodes=Hash[*cluster][:cache_nodes]
  if nodes.empty?
    return nil
  end

  endpoint=Hash[*nodes][:endpoint]
  if endpoint.empty?
    return nil
  end

  logger.info "found redis endpoint at #{endpoint[:address]}"
  endpoint[:address]
end

#run ⇒ Object 



61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/automan/elasticache/router.rb', line 61

def run
  log_options

  logger.info "getting redis primary node name..."
  primary_endpoint = node_name_from_elasticache_environment environment

  if primary_endpoint.nil?
    false
  else
    update_dns_alias(
      hosted_zone_name,
      redis_host,
      primary_endpoint
      )
    true
  end
end

#update_dns_alias(zone_name, redis_cname, primary_endpoint) ⇒ Object

be sure alias_name ends in period



43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/automan/elasticache/router.rb', line 43

def update_dns_alias(zone_name, redis_cname, primary_endpoint)
  zone = r53.hosted_zones.select {|z| z.name == zone_name}.first
  rrset = zone.rrsets[redis_cname + '.', 'CNAME']

  if rrset.exists?
    logger.info "removing old record at #{redis_cname}"
    rrset.delete
  end

  logger.info "creating record #{redis_cname} -> #{primary_endpoint}"
  zone.rrsets.create(
    redis_cname + '.',
    'CNAME',
    :ttl => 300,
    :resource_records => [{:value => primary_endpoint}]
    )
end