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February 4, 2009 13:16
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# Author: Cyril Rohr | |
# This has been gemified into the cacheability gem (http://github.com/cryx/cacheability/tree/master) | |
require 'rubygems' | |
require 'rest_client' # sudo gem install rest-client | |
require 'rack/cache' # sudo gem install rack-cache | |
module RestClient | |
# this is a quick hack to show how you can use rack-cache as a powerful client cache. | |
class CacheableResource < Resource | |
attr_reader :cache | |
CACHE_DEFAULT_OPTIONS = {}.freeze | |
def initialize(*args) | |
super(*args) | |
# rack-cache creates a singleton, so that there is only one instance of the cache at any time | |
@cache = Rack::Cache.new(self, options[:cache] || CACHE_DEFAULT_OPTIONS) | |
end | |
def get(additional_headers = {}, pass_through_cache = true) | |
if pass_through_cache && cache | |
uri = URI.parse(url) | |
uri_path_split = uri.path.split("/") | |
path_info = (last_part = uri_path_split.pop) ? "/"+last_part : "" | |
script_name = uri_path_split.join("/") | |
env = { | |
"REQUEST_METHOD" => 'GET', | |
"SCRIPT_NAME" => script_name, | |
"PATH_INFO" => path_info, | |
"QUERY_STRING" => uri.query, | |
"SERVER_NAME" => uri.host, | |
"SERVER_PORT" => uri.port | |
} | |
debeautify_headers(additional_headers).each do |key, value| | |
env.merge!("HTTP_"+key.to_s.upcase => value) | |
end | |
cache.call(env) | |
else | |
super(additional_headers) | |
end | |
end | |
def debeautify_headers(headers = {}) | |
headers.inject({}) do |out, (key, value)| | |
out[key.to_s.gsub(/_/, '-')] = value#.first | |
out | |
end | |
end | |
def call(env) | |
http_headers = env.inject({}) do |out, (header, value)| | |
if header =~ /HTTP_/ | |
out[header.gsub("HTTP_", '')] = value unless value.nil? || value.empty? | |
end | |
out | |
end | |
response = get(debeautify_headers(http_headers), pass_through_cache=false) | |
response.headers.delete(:x_content_digest) # don't know why, but it seems to make the validation fail if kept... | |
[response.code, debeautify_headers( response.headers ), response.to_s] | |
rescue RestClient::NotModified | |
# Unfortunately, RestClient does not return the Net::HTTP response in the exception... | |
[304, {}, ""] | |
end | |
end | |
end | |
RestClient.log = "stdout" | |
# will store the cached data in files | |
# cache_options = {:verbose => true, :metastore => 'file:/tmp/cache/meta', :entitystore => 'file:/tmp/cache/body'} | |
# will store the cached data in heap (all data are lost at the end of the script) | |
cache_options = {} | |
resource = RestClient::CacheableResource.new('http://some/cacheable/resource', :cache => cache_options) | |
begin | |
10.times do | |
resource['/'].get(:accept => 'application/json') | |
sleep 1 | |
end | |
rescue RestClient::ResourceNotFound | |
puts 'Resource not found.' | |
rescue RestClient::RequestTimeout | |
puts 'Timeout.' | |
rescue RestClient::Unauthorized | |
puts 'Unauthorized.' | |
rescue RestClient::RequestFailed | |
puts 'Request failed.' | |
rescue RestClient::ServerBrokeConnection | |
puts 'Connection broken.' | |
rescue Exception => e | |
puts e.message | |
end |
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