Class: Jerakia::Datasource::File
- Inherits:
-
Instance
- Object
- Instance
- Jerakia::Datasource::File
show all
- Defined in:
- lib/jerakia/datasource/file.rb,
lib/jerakia/datasource/file/json.rb,
lib/jerakia/datasource/file/yaml.rb
Overview
Jerakia::Datasource.define(:file) do
Defined Under Namespace
Modules: Json, Yaml
Instance Attribute Summary
Attributes inherited from Instance
#options, #request, #response
Instance Method Summary
collapse
Methods inherited from Instance
#answer, feature, #features?, #initialize, option, validate_options
Instance Method Details
#cache ⇒ Object
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# File 'lib/jerakia/datasource/file.rb', line 29
def cache
Jerakia::Cache::File
end
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#extension ⇒ Object
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# File 'lib/jerakia/datasource/file.rb', line 25
def extension
options[:extension] || format_handler::EXTENSION
end
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# File 'lib/jerakia/datasource/file.rb', line 20
def format_handler
format = options[:format]
eval "Jerakia::Datasource::File::#{format.to_s.capitalize}"
end
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#get_file(diskname) ⇒ Object
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# File 'lib/jerakia/datasource/file.rb', line 38
def get_file(diskname)
::File.read(diskname) if ::File.exists?(diskname)
end
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#get_file_with_cache(diskname) ⇒ Object
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# File 'lib/jerakia/datasource/file.rb', line 33
def get_file_with_cache(diskname)
Jerakia.log.debug("Querying cache for file #{diskname}")
cache.retrieve(diskname)
end
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#list_fragments(prefix, extension) ⇒ Object
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# File 'lib/jerakia/datasource/file.rb', line 42
def list_fragments(prefix, extension)
Dir["#{prefix}.d/*.#{extension}"] if ::File.directory?("#{prefix}.d")
end
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# File 'lib/jerakia/datasource/file.rb', line 14
def load_format_handler
format = options[:format]
require "jerakia/datasource/file/#{format.to_s}"
eval "extend Jerakia::Datasource::File::#{format.to_s.capitalize}"
end
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#lookup ⇒ Object
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# File 'lib/jerakia/datasource/file.rb', line 81
def lookup
Jerakia.log.debug("Searching key #{request.key} from file format #{options[:format]}")
load_format_handler
paths=options[:searchpath].flatten
answer do |response|
path = paths.shift
break unless path
data = read_from_file(path)
unless data[request.key].nil?
response.submit data[request.key]
end
end
end
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#read_from_file(fname) ⇒ Object
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# File 'lib/jerakia/datasource/file.rb', line 46
def read_from_file(fname)
docroot = options[:docroot]
namespace = request.namespace
cached = options[:enable_caching]
fpath = []
fpath << docroot unless fname[0] == '/'
fpath << [fname, namespace]
diskname_prefix = ::File.join(fpath.flatten).gsub(/\/$/, '').to_s
diskname = "#{diskname_prefix}.#{extension}"
files = [diskname]
files << list_fragments(diskname_prefix, extension)
raw_data = ''
files.flatten.compact.each do |f|
Jerakia.log.debug("read_from_file() #{f}")
file_contents = get_file_with_cache(f)
if cached
file_contents = get_file_with_cache(f)
else
file_content = get_file(f)
end
raw_data << file_contents if file_contents
end
begin
convert(raw_data)
rescue Jerakia::FileParseError => e
raise Jerakia::FileParseError, "While parsing #{diskname}: #{e.message}"
end
end
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