Class: RightScale::MetadataSources::FileMetadataSource

Inherits:
RightScale::MetadataSource show all
Defined in:
lib/clouds/metadata_sources/file_metadata_source.rb

Overview

Provides metadata by reading a dictionary file on disk.

Direct Known Subclasses

ConfigDriveMetadataSource

Instance Attribute Summary collapse

Attributes inherited from RightScale::MetadataSource

#logger

Instance Method Summary collapse

Methods inherited from RightScale::MetadataSource

#append_branch_name, #append_leaf_name

Constructor Details

#initialize(options) ⇒ FileMetadataSource

Returns a new instance of FileMetadataSource.

Raises:



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# File 'lib/clouds/metadata_sources/file_metadata_source.rb', line 32

def initialize(options)
  super(options)
  raise ArgumentError.new("options[:cloud_metadata_root_path] is required") unless @cloud_metadata_root_path = options[:cloud_metadata_root_path]
  raise ArgumentError.new("options[:user_metadata_root_path] is required") unless @user_metadata_root_path = options[:user_metadata_root_path]

  @cloud_metadata_source_file_path = options[:cloud_metadata_source_file_path]
  @user_metadata_source_file_path = options[:user_metadata_source_file_path]
end

Instance Attribute Details

#cloud_metadata_source_file_path ⇒ Object

Returns the value of attribute cloud_metadata_source_file_path.



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# File 'lib/clouds/metadata_sources/file_metadata_source.rb', line 30

def cloud_metadata_source_file_path
  @cloud_metadata_source_file_path
end

#user_metadata_source_file_path ⇒ Object

Returns the value of attribute user_metadata_source_file_path.



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# File 'lib/clouds/metadata_sources/file_metadata_source.rb', line 30

def user_metadata_source_file_path
  @user_metadata_source_file_path
end

Instance Method Details

#finish ⇒ Object

Nothing to do.



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# File 'lib/clouds/metadata_sources/file_metadata_source.rb', line 66

def finish
  true
end

#query(path) ⇒ Object

Queries for metadata using the given path.

Parameters

path(String)

metadata path

Return

metadata(String)

query result or empty

Raises

QueryFailed

on any failure to query



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# File 'lib/clouds/metadata_sources/file_metadata_source.rb', line 51

def query(path)
  result = ""
  if path == @cloud_metadata_root_path
    result = File.read(@cloud_metadata_source_file_path) if @cloud_metadata_source_file_path
  elsif path == @user_metadata_root_path
    result = File.read(@user_metadata_source_file_path) if @user_metadata_source_file_path
  else
    raise QueryFailed.new("Unknown path: #{path}")
  end
  result
rescue Exception => e
  raise QueryFailed.new(e.message)
end