Module: Itrigga::NetHelper

Defined in:
lib/itrigga/net_helper.rb,
lib/itrigga/net_helper/typhoeus.rb,
lib/itrigga/net_helper/rest_client.rb

Defined Under Namespace

Classes: RestClient, Typhoeus

Class Method Summary collapse

Class Method Details

.available_http_engines ⇒ Object

gets a list of engines available (each is a different class in this module that implements 'get' method)



18
19
20
 
# File 'lib/itrigga/net_helper.rb', line 18

def available_http_engines
  Itrigga::NetHelper.constants
end

.default_http_engine ⇒ Object 



22
23
24
 
# File 'lib/itrigga/net_helper.rb', line 22

def default_http_engine
  "RestClient"
end

.discover_favicon_url(root_url, time_out = 5) ⇒ Object 



98
99
100
101
102
103
104
105
 
# File 'lib/itrigga/net_helper.rb', line 98

def discover_favicon_url(root_url, time_out = 5)
  favicon_urls = ['favicon.ico'] + discover_icon_hrefs(root_url)
  favicon_urls.compact.each do |url|
    abs_url = URI.join(root_url, url).to_s
    return abs_url if get_with_timeout( abs_url, time_out ).is_a?(Net::HTTPSuccess)
  end
  nil
end

.discover_icon_hrefs(url) ⇒ Object 



107
108
109
110
111
 
# File 'lib/itrigga/net_helper.rb', line 107

def discover_icon_hrefs(url)
  pd = open(url) { |f| parse_with_hpricot(f) }
  links = pd.search("//link[@rel='shortcut icon']") + pd.search("//link[@rel='icon']") 
  links.map{ |link| link.attributes['href'] }.compact.to_a
end

.do_get(url, timeout = 5, retries_on_timeout = 5, max_redirects = 3) ⇒ Object

wrapper method for backwards compat.



28
29
30
 
# File 'lib/itrigga/net_helper.rb', line 28

def do_get(url, timeout=5, retries_on_timeout=5, max_redirects = 3)
  get :url => url, :timeout => timeout, :retries_on_timeout => retries_on_timeout, :max_redirects => max_redirects
end

.format_url_shortener_api_url(raw_url, config_hash) ⇒ Object

parses the :url template for the url shortener service



153
154
155
156
 
# File 'lib/itrigga/net_helper.rb', line 153

def format_url_shortener_api_url(raw_url, config_hash)
  escaped_url = CGI::escape(raw_url)
  config_hash[:url].gsub("{{username}}",config_hash[:username] || "").gsub("{{api_key}}",config_hash[:api_key] || "").gsub("{{raw_url}}",escaped_url)
end

.get(options = {}) ⇒ Object

Raises:

  • (ArgumentError) 


33
34
35
36
37
38
39
 
# File 'lib/itrigga/net_helper.rb', line 33

def get(options = {})
  opts = { :timeout => 5, :retries_on_timeout => 5, :max_redirects => 3, :headers => {} }.merge(options)
  raise ArgumentError.new(":url is required" ) unless opts[:url]
  
  engine_klass = get_engine opts
  with_timeout(opts) { engine_klass.get(opts) }
end

.get_engine(opts = {}) ⇒ Object 



68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
 
# File 'lib/itrigga/net_helper.rb', line 68

def get_engine(opts = {})
  # default to rest_client if not given an engine
  opts[:http_engine] ||= ( defined?(ITNH_HTTP_ENGINE) ? ITNH_HTTP_ENGINE : default_http_engine )
  
  # only use typhoeus if it is actually been required
  opts[:http_engine] = default_http_engine if opts[:http_engine] == "Typhoeus" && defined?(::Typhoeus) == nil
  
  if available_http_engines.include?(opts[:http_engine])
    Itrigga::NetHelper.const_get opts[:http_engine]
  else
    puts "[NetHelper] Could not find http_engine '#{opts[:http_engine]}'. Available engines are: #{available_http_engines.join(',')}. Defaulting to Net::HTTP"
    Itrigga::NetHelper.const_get default_http_engine
  end
  
end

.ip_of(server) ⇒ Object 



119
120
121
 
# File 'lib/itrigga/net_helper.rb', line 119

def ip_of(server)
  IPSocket::getaddress(server)
end

.parse_with_hpricot(html) ⇒ Object

Have difficulty mocking/stubbing the top-level Hpricot call This wrapper makes it testable



115
116
117
 
# File 'lib/itrigga/net_helper.rb', line 115

def parse_with_hpricot(html)
  Hpricot.parse(html)
end

.query_string(h, opts = {:encode_values=>false, :skip_empty=>false}) ⇒ Object 



86
87
88
89
90
91
92
 
# File 'lib/itrigga/net_helper.rb', line 86

def query_string( h, opts={:encode_values=>false, :skip_empty=>false} )
  params = []
  h.each{ |k,v| 
    params << "#{k.to_s}=#{ opts[:encode_values] ? url_encode(v) : v }" unless v.to_s.empty? && opts[:skip_empty]
  }
  params.sort.join('&')
end

.shorten_url(opts = {}) ⇒ Object

uses the url shortener service defined for this site by default will use bit.ly



125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
 
# File 'lib/itrigga/net_helper.rb', line 125

def shorten_url(opts={})
  opts[:attempts] ||= 0
  return opts[:url] if opts[:attempts] > 3

  api_url = self.format_url_shortener_api_url(opts[:url], opts[:config])

  begin
    response = NetHelper.get :url => api_url
  rescue Exception => e
    sleep 10 unless defined?(RAILS_ENV) && RAILS_ENV == "test"
    return shorten_url(:url=>opts[:url], :attempts=>opts[:attempts]+1)
  end

  data =  JSON.parse(response).recursive_symbolize_keys!


  if data[:status_code] == 200
    return data[:data][:url]
  else # theres been a problem, try again if we have tries left
  
    sleep 10 unless defined?(RAILS_ENV) && RAILS_ENV == "test"
    return shorten_url(:url=>opts[:url], :attempts=>opts[:attempts]+1)
  
  end

end

.transfer_file_scp(opts = {}) ⇒ Object

Transfer a file using scp between servers

Options: :host - the target server name. Hash. Must have keys: => :port - the port on which to connect => :ssh_key_path - the absolute path to the ssh key file which it will use to connect => :user - the user to connect as => :host - the hostname to connect to :target_path - the absolute path on the target server to put the file :file - the file to transfer. Must be an absolute path to the file

Raises:

  • (ArgumentError) 


170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
 
# File 'lib/itrigga/net_helper.rb', line 170

def transfer_file_scp(opts = {})

  raise ArgumentError.new("File '#{opts[:file]}' does not exist!") unless opts[:file] && File.exist?(opts[:file])
  raise ArgumentError.new("host is required") unless opts[:host]
  raise ArgumentError.new("No target_path defined") unless opts[:target_path]

  #host = TRIGGA_CONFIG.hosts.detect{|host| host[:display_name].to_s == opts[:target].to_s}
  
  # now that everything checks out make sure the destination dir path exists. If not then create it
  command = "ssh -p#{opts[:host][:port]} -i #{opts[:host][:ssh_key_path]} #{opts[:host][:user]}@#{opts[:host][:host]} 'mkdir -p #{File.dirname(opts[:target_path])}'"
  `#{command}`
  
  # now transfer the file across
  command = "scp -P#{opts[:host][:port]} -i #{opts[:host][:ssh_key_path]} #{opts[:file]} #{opts[:host][:user]}@#{opts[:host][:host]}:#{opts[:target_path]}"
  `#{command}`

end

.url_encode(s) ⇒ Object 



94
95
96
 
# File 'lib/itrigga/net_helper.rb', line 94

def url_encode( s )
  URI.escape( s.to_s, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]") )
end

.with_timeout(opts, &block) ⇒ Object 



43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
 
# File 'lib/itrigga/net_helper.rb', line 43

def with_timeout(opts, &block)
  retrycount = 0
  resp = begin
    if defined?(SystemTimer)
      SystemTimer.timeout_after(opts[:timeout]) do
        yield
      end
    else
      timeout( opts[:timeout] ) do
        yield
      end
    end
  rescue ::TimeoutError, ::RestClient::RequestTimeout
    if(retrycount < opts[:retries_on_timeout])
      retrycount+=1
      retry
    else
      raise IOError.new( "HTTP request timed out #{retrycount} times" )
    end
  end
  resp  
end