Class: Rbcli::State::RemoteConnectors::DynamoDB
- Inherits:
-
Object
- Object
- Rbcli::State::RemoteConnectors::DynamoDB
- Defined in:
- lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb
Class Method Summary collapse
Instance Method Summary collapse
- #create_table ⇒ Object
- #get_object ⇒ Object
-
#initialize(dynamodb_table, region, aws_access_key_id, aws_secret_access_key, locking: false, lock_timeout: 60) ⇒ DynamoDB
constructor
A new instance of DynamoDB.
- #lock ⇒ Object
- #lock_or_wait(recursed = false) ⇒ Object
- #locked? ⇒ Boolean
- #object_exists? ⇒ Boolean
- #save_object(datahash) ⇒ Object
- #table_exists? ⇒ Boolean
- #unlock ⇒ Object
Constructor Details
#initialize(dynamodb_table, region, aws_access_key_id, aws_secret_access_key, locking: false, lock_timeout: 60) ⇒ DynamoDB
Returns a new instance of DynamoDB.
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 42 def initialize dynamodb_table, region, aws_access_key_id, aws_secret_access_key, locking: false, lock_timeout: 60 @region = region @dynamo_table_name = dynamodb_table @item_name = Rbcli::configuration(:me, :scriptname) @locking = locking @scheduler = nil @lock_timeout = lock_timeout @exit_code_set = false @should_unlock_at_exit = false @dynamo_client = Aws::DynamoDB::Client.new( region: @region, access_key_id: aws_access_key_id, secret_access_key: aws_secret_access_key ) end |
Class Method Details
.save_defaults(aws_access_key_id: nil, aws_secret_access_key: nil) ⇒ Object
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 29 def self.save_defaults aws_access_key_id: nil, aws_secret_access_key: nil Rbcli::Config::add_categorized_defaults :dynamodb_remote_state, 'Remote State Settings - requires DynamoDB', { access_key_id: { description: 'AWS Access Key ID -- leave as null to look for AWS credentials on system. See: https://docs.aws.amazon.com/sdk-for-ruby/v3/developer-guide/setup-config.html', value: aws_access_key_id }, secret_access_key: { description: 'AWS Secret Access Key -- leave as null to look for AWS credentials on system.', value: aws_secret_access_key } } end |
Instance Method Details
#create_table ⇒ Object
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 59 def create_table # We only need to create the table unless table_exists? print "Creating DynmoDB Table. Please wait..." @dynamo_client.create_table( { attribute_definitions: [ { attribute_name: "Script Name", attribute_type: "S" } ], key_schema: [ { attribute_name: "Script Name", key_type: "HASH" } ], provisioned_throughput: { read_capacity_units: 5, write_capacity_units: 5, }, table_name: @dynamo_table_name, } ) wait_for_table_creation end end |
#get_object ⇒ Object
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 106 def get_object lock_or_wait item = @dynamo_client.get_item( { key: {'Script Name' => @item_name}, table_name: @dynamo_table_name, } ).item item.delete 'Script Name' item end |
#lock ⇒ Object
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 129 def lock @dynamo_client.put_item( { table_name: @dynamo_table_name, item: { 'Script Name' => "#{@item_name}_lock", 'locked' => true, 'locked_until' => (Time.now + @lock_timeout).getutc.strftime('%s'), 'locked_by' => Digest::SHA2.hexdigest(Mac.addr) } } ) end |
#lock_or_wait(recursed = false) ⇒ Object
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 165 def lock_or_wait recursed = false return true unless @locking delay_in_seconds = 2 lockdata = get_lockdata should_claim = false # First, we identify if the lock is active if lockdata['locked'] # If the lock is not ours, we have to check the expiration if lockdata['locked_by'] != Digest::SHA2.hexdigest(Mac.addr) # If the lock is not ours, and it has expired, we claim it if lockdata['locked_until'].to_i < Time.now.getutc.to_i should_claim = true # If the lock data is not ours and has not expired, we wait and try again else print 'Acquiring lock on DynamoDB. Please wait..' unless recursed print '.' sleep delay_in_seconds lock_or_wait true end # If the lock is ours, we check the expiry else # If the lock is ours and is close to expiry or has expired, we refresh it if lockdata['locked_until'].to_i < (Time.now - (@lock_timeout / 10)).getutc.to_i should_claim = true # If the lock is ours and is not near expiry, do nothing else # Do nothing! But do finish the string that's shown to the user puts 'done!' if recursed end end else # If clearly unlocked, we claim it should_claim = true end if should_claim # We attempt to get a lock then validate our success lock # If we succeeded then we set up a scheduler to ensure we keep it lockdata = get_lockdata if (lockdata['locked_by'] == Digest::SHA2.hexdigest(Mac.addr)) and (lockdata['locked_until'].to_i > Time.now.getutc.to_i) # Of course, if the scheduler already exists, we don't bother unless @scheduler @scheduler ||= Rufus::Scheduler.new @scheduler.every "#{@lock_timeout - 2}s" do lock end # We also make sure we release the lock at exit. In case this doesn't happen, the lock will expire on its own @should_unlock_at_exit = true unless @exit_code_set at_exit {unlock if @should_unlock_at_exit} @exit_code_set = true end end puts 'done!' if recursed # If we failed locking then we need to try the process all over again else print 'Error: Failed to lock DynamoDB. Retrying...' sleep delay_in_seconds lock_or_wait true end end end |
#locked? ⇒ Boolean
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 160 def locked? lockdata = get_lockdata (lockdata['locked']) and (lockdata['locked_until'].to_i > Time.now.getutc.to_i) and (lockdata['locked_by'] != Digest::SHA2.hexdigest(Mac.addr)) end |
#object_exists? ⇒ Boolean
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 92 def object_exists? begin item = @dynamo_client.get_item( { key: {'Script Name' => @item_name}, table_name: @dynamo_table_name, } ) return (!item.item.nil?) rescue Aws::DynamoDB::Errors::ResourceNotFoundException return false end end |
#save_object(datahash) ⇒ Object
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 118 def save_object datahash raise StandardError "DynamoDB has been locked by another user since the last change. Please try again later." if locked? lock_or_wait @dynamo_client.put_item( { table_name: @dynamo_table_name, item: datahash.merge({'Script Name' => @item_name}) } ) end |
#table_exists? ⇒ Boolean
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 88 def table_exists? @dynamo_client.list_tables.table_names.to_a.include? @dynamo_table_name end |
#unlock ⇒ Object
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# File 'lib/rbcli/state_storage/remote_state_connectors/dynamodb.rb', line 143 def unlock @dynamo_client.put_item( { table_name: @dynamo_table_name, item: { 'Script Name' => "#{@item_name}_lock", 'locked' => false, 'locked_until' => Time.now.getutc.strftime('%s'), 'locked_by' => false } } ) @scheduler.shutdown :kill if @scheduler @should_unlock_at_exit = false @scheduler = nil end |