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#
# A basic function to retrieve data in couchdb
#
module Puppet::Parser::Functions
newfunction(:couchdblookup, :type => :rvalue) do |args|
require 'json'
require 'open-uri'
raise Puppet::ParseError, ("couchdblookup(): wrong number of arguments (#{args.length}; must be 2 or 3)") unless args.length.between?(2, 3)
url = args[0]
key = args[1]
default = args[2] if args.length >= 3
begin
json = JSON.parse(open(URI.parse(url)).read)
rescue OpenURI::HTTPError => error
raise Puppet::ParseError, "couchdblookup(): fetching URL #{url} failed with status '#{error.message}'"
rescue Timeout::Error => error
raise Puppet::ParseError, "couchdblookup(): connection to couchdb server timed out: '#{error.message}'"
rescue Errno::ECONNREFUSED => error
raise Puppet::ParseError, "couchdblookup(): connection to couchdb server failed: '#{error.message}'"
rescue JSON::ParserError => error
raise Puppet::ParseError, "couchdblookup(): failed to parse JSON received from couchdb: '#{error.message}'"
rescue StandardError => error
raise Puppet::ParseError, "couchdblookup(): something unexpected happened: '#{error.inspect}'"
end
result = nil
if json.has_key?("rows")
if json['rows'].length > 1
arr = json['rows'].collect do |x|
x[key] if x.is_a?(Hash) and x.has_key?(key)
end
arr.compact!
result = arr unless arr.empty?
elsif json['rows'].length == 1
hash = json['rows'].pop
result = hash[key] if hash.is_a?(Hash)
end
elsif json.has_key?(key)
result = json[key]
end
result or default or raise Puppet::ParseError, "couchdblookup(): key '#{key}' not found in JSON object !"
end
end
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