Class: Backends::Dummy::Storage

Inherits:
Base
  • Object
show all
Defined in:
lib/backends/dummy/storage.rb

Constant Summary

Constants inherited from Base

Base::API_VERSION, Base::FIXTURES, Base::FIXTURES_TPL

Instance Method Summary collapse

Methods inherited from Base

#add_other_backend, #initialize

Methods included from Helpers::ExtensionsHelper

#read_extensions

Methods included from Helpers::JsonCollectionHelper

#read_from_json

Constructor Details

This class inherits a constructor from Backends::Dummy::Base

Instance Method Details

#create(storage) ⇒ String

Instantiates a new storage instance from ::Occi::Infrastructure::Storage. ID given in the occi.core.id attribute is optional and can be changed inside this method. Final occi.core.id must be returned as a String. If the requested instance cannot be created, an error describing the problem must be raised, @see Backends::Errors.

Examples:

storage = ::Occi::Infrastructure::Storage.new
storage_id = create(storage)
    #=> "65d4f65adfadf-ad2f4ad-daf5ad-f5ad4fad4ffdf"

Parameters:

  • storage (::Occi::Infrastructure::Storage)

    storage instance containing necessary attributes

Returns:

  • (String)

    final identifier of the new storage instance


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# File 'lib/backends/dummy/storage.rb', line 73

def create(storage)
  fail Backends::Errors::IdentifierConflictError, "Instance with ID #{storage.id} already exists!" if list_ids.include?(storage.id)

  updated = read_storage_fixtures << storage
  save_storage_fixtures(updated)

  storage.id
end

#delete(storage_id) ⇒ true, false

Deletes a specific storage instance, instance to be deleted is specified by an ID, this ID must match the occi.core.id attribute of the deleted instance. If the requested instance cannot be deleted, an error describing the problem must be raised, @see Backends::Errors.

Examples:

delete("65d4f65adfadf-ad2f4ad-daf5ad-f5ad4fad4ffdf") #=> true

Parameters:

  • storage_id (String)

    an identifier of a storage instance to be deleted

Returns:

  • (true, false)

    result of the operation


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# File 'lib/backends/dummy/storage.rb', line 118

def delete(storage_id)
  fail Backends::Errors::ResourceNotFoundError, "Instance with ID #{storage_id} does not exist!" unless list_ids.include?(storage_id)

  updated = read_storage_fixtures.delete_if { |s| s.id == storage_id }
  save_storage_fixtures(updated)

  begin
    get(storage_id)
    false
  rescue Backends::Errors::ResourceNotFoundError
    true
  end
end

#delete_all(mixins = nil) ⇒ true, false

Deletes all storage instances, instances to be deleted must be filtered by the specified filter, filter (if set) must contain an ::Occi::Core::Mixins instance. If the requested instances cannot be deleted, an error describing the problem must be raised, @see Backends::Errors.

Examples:

delete_all #=> true

mixins = ::Occi::Core::Mixins.new << ::Occi::Core::Mixin.new
delete_all(mixins)  #=> true

Parameters:

  • mixins (::Occi::Core::Mixins) (defaults to: nil)

    a filter containing mixins

Returns:

  • (true, false)

    result of the operation


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# File 'lib/backends/dummy/storage.rb', line 95

def delete_all(mixins = nil)
  if mixins.blank?
    drop_storage_fixtures
    read_storage_fixtures.empty?
  else
    old_count = read_storage_fixtures.count
    updated = read_storage_fixtures.delete_if { |s| (s.mixins & mixins).any? }
    save_storage_fixtures(updated)
    old_count != read_storage_fixtures.count
  end
end

#get(storage_id) ⇒ ::Occi::Infrastructure::Storage?

Gets a specific storage instance as ::Occi::Infrastructure::Storage. ID given as an argument must match the occi.core.id attribute inside the returned ::Occi::Infrastructure::Storage instance, however it is possible to implement internal mapping to a platform-specific identifier.

Examples:

storage = get('65d4f65adfadf-ad2f4ad-daf5ad-f5ad4fad4ffdf')
    #=> #<::Occi::Infrastructure::Storage>

Parameters:

  • storage_id (String)

    OCCI identifier of the requested storage instance

Returns:

  • (::Occi::Infrastructure::Storage, nil)

    a storage instance or `nil`


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# File 'lib/backends/dummy/storage.rb', line 53

def get(storage_id)
  found = read_storage_fixtures.to_a.select { |s| s.id == storage_id }.first
  fail Backends::Errors::ResourceNotFoundError, "Instance with ID #{storage_id} does not exist!" unless found

  found
end

#get_extensions::Occi::Collection

Returns a collection of custom mixins introduced (and specific for) the enabled backend. Only mixins and actions are allowed.

Returns:

  • (::Occi::Collection)

    collection of extensions (custom mixins and/or actions)


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# File 'lib/backends/dummy/storage.rb', line 239

def get_extensions
  # no extensions to include
  ::Occi::Collection.new
end

#list(mixins = nil) ⇒ ::Occi::Core::Resources

Gets all storage instances, instances must be filtered by the specified filter, filter (if set) must contain an ::Occi::Core::Mixins instance. Returned collection must contain ::Occi::Infrastructure::Storage instances wrapped in ::Occi::Core::Resources.

Examples:

storages = list #=> #<::Occi::Core::Resources>
storages.first #=> #<::Occi::Infrastructure::Storage>

mixins = ::Occi::Core::Mixins.new << ::Occi::Core::Mixin.new
storages = list(mixins) #=> #<::Occi::Core::Resources>

Parameters:

  • mixins (::Occi::Core::Mixins) (defaults to: nil)

    a filter containing mixins

Returns:

  • (::Occi::Core::Resources)

    a collection of storage instances


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# File 'lib/backends/dummy/storage.rb', line 33

def list(mixins = nil)
  if mixins.blank?
    read_storage_fixtures
  else
    filtered_storages = read_storage_fixtures.to_a.select { |s| (s.mixins & mixins).any? }
    ::Occi::Core::Resources.new filtered_storages
  end
end

#list_ids(mixins = nil) ⇒ Array<String>

Gets all storage instance IDs, no details, no duplicates. Returned identifiers must correspond to those found in the occi.core.id attribute of ::Occi::Infrastructure::Storage instances.

Examples:

list_ids #=> []
list_ids #=> ["65d4f65adfadf-ad2f4ad-daf5ad-f5ad4fad4ffdf",
                         "ggf4f65adfadf-adgg4ad-daggad-fydd4fadyfdfd"]

Parameters:

  • mixins (::Occi::Core::Mixins) (defaults to: nil)

    a filter containing mixins

Returns:

  • (Array<String>)

    IDs for all available storage instances


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# File 'lib/backends/dummy/storage.rb', line 15

def list_ids(mixins = nil)
  list(mixins).to_a.map { |s| s.id }
end

#partial_update(storage_id, attributes = nil, mixins = nil, links = nil) ⇒ true, false

Partially updates an existing storage instance, instance to be updated is specified by storage_id. If the requested instance cannot be updated, an error describing the problem must be raised, @see Backends::Errors.

Examples:

attributes = ::Occi::Core::Attributes.new
mixins = ::Occi::Core::Mixins.new
links = ::Occi::Core::Links.new
partial_update(storage_id, attributes, mixins, links) #=> true

Parameters:

  • storage_id (String)

    unique identifier of a storage instance to be updated

  • attributes (::Occi::Core::Attributes) (defaults to: nil)

    a collection of attributes to be updated

  • mixins (::Occi::Core::Mixins) (defaults to: nil)

    a collection of mixins to be added

  • links (::Occi::Core::Links) (defaults to: nil)

    a collection of links to be added

Returns:

  • (true, false)

    result of the operation


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# File 'lib/backends/dummy/storage.rb', line 148

def partial_update(storage_id, attributes = nil, mixins = nil, links = nil)
  # TODO: impl
  fail Backends::Errors::MethodNotImplementedError, 'Partial updates are currently not supported!'
end

#trigger_action(storage_id, action_instance) ⇒ true, false

Triggers an action on an existing storage instance, the storage instance in question is identified by a storage instance ID, action is identified by the action.term attribute of the action instance passed as an argument. If the requested action cannot be triggered, an error describing the problem must be raised, @see Backends::Errors.

Examples:

action_instance = ::Occi::Core::ActionInstance.new
trigger_action("65d4f65adfadf-ad2f4ad-daf5ad-f5ad4fad4ffdf", action_instance)
  #=> true

Parameters:

  • storage_id (String)

    storage instance identifier

  • action_instance (::Occi::Core::ActionInstance)

    action to be triggered

Returns:

  • (true, false)

    result of the operation


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# File 'lib/backends/dummy/storage.rb', line 206

def trigger_action(storage_id, action_instance)
  case action_instance.action.type_identifier
  when 'http://schemas.ogf.org/occi/infrastructure/storage/action#offline'
    state = 'offline'
  when 'http://schemas.ogf.org/occi/infrastructure/storage/action#online'
    state = 'online'
  when 'http://schemas.ogf.org/occi/infrastructure/storage/action#backup'
    state = 'online'
  when 'http://schemas.ogf.org/occi/infrastructure/storage/action#resize'
    state = 'online'
  when 'http://schemas.ogf.org/occi/infrastructure/storage/action#snapshot'
    state = 'online'
  else
    fail Backends::Errors::ActionNotImplementedError,
         "Action #{action_instance.action.type_identifier.inspect} is not implemented!"
  end

  # get existing storage instance and set a new state
  storage = get(storage_id)
  storage.state = state

  # clean-up and save the new collection
  delete(storage.id)
  updated = read_storage_fixtures << storage
  save_storage_fixtures(updated)

  true
end

#trigger_action_on_all(action_instance, mixins = nil) ⇒ true, false

Triggers an action on all existing storage instance, instances must be filtered by the specified filter, filter (if set) must contain an ::Occi::Core::Mixins instance, action is identified by the action.term attribute of the action instance passed as an argument. If the requested action cannot be triggered, an error describing the problem must be raised, @see Backends::Errors.

Examples:

action_instance = ::Occi::Core::ActionInstance.new
mixins = ::Occi::Core::Mixins.new << ::Occi::Core::Mixin.new
trigger_action_on_all(action_instance, mixin) #=> true

Parameters:

  • action_instance (::Occi::Core::ActionInstance)

    action to be triggered

  • mixins (::Occi::Core::Mixins) (defaults to: nil)

    a filter containing mixins

Returns:

  • (true, false)

    result of the operation


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# File 'lib/backends/dummy/storage.rb', line 187

def trigger_action_on_all(action_instance, mixins = nil)
  list_ids(mixins).each { |strg| trigger_action(strg, action_instance) }
  true
end

#update(storage) ⇒ true, false

Updates an existing storage instance, instance to be updated is specified using the occi.core.id attribute of the instance passed as an argument. If the requested instance cannot be updated, an error describing the problem must be raised, @see Backends::Errors.

Examples:

storage = ::Occi::Infrastructure::Storage.new
update(storage) #=> true

Parameters:

  • storage (::Occi::Infrastructure::Storage)

    instance containing updated information

Returns:

  • (true, false)

    result of the operation


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# File 'lib/backends/dummy/storage.rb', line 164

def update(storage)
  fail Backends::Errors::ResourceNotFoundError, "Instance with ID #{storage.id} does not exist!" unless list_ids.include?(storage.id)

  delete(storage.id)
  updated = read_storage_fixtures << storage
  save_storage_fixtures(updated)
  get(storage.id) == storage
end