Class: Fluent::GrowthForecastOutput

Inherits:
Output
  • Object
show all
Defined in:
lib/fluent/plugin/out_growthforecast.rb

Constant Summary collapse

DEFAULT_GRAPH_PATH = 
{
  :ignore => '${service}/${section}/${key_name}',
  :service => '${tag}/${section}/${key_name}',
  :section => '${service}/${tag}/${key_name}',
  :name_prefix => '${service}/${section}/${tag}_${key_name}',
}

Instance Method Summary collapse

Constructor Details

#initialize ⇒ GrowthForecastOutput

Returns a new instance of GrowthForecastOutput.



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 4

def initialize
  super
  require 'net/http'
  require 'uri'
  require 'resolve/hostname'
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 91

def configure(conf)
  super

  if @gfapi_url !~ /\/api\/\Z/
    raise Fluent::ConfigError, "gfapi_url must end with /api/"
  end
  if not @graph_path.nil? and @graph_path !~ /^[^\/]+\/[^\/]+\/[^\/]+$/
    raise Fluent::ConfigError, "graph_path must be like '${service}/${section}/${tag}_${key_name}'"
  end

  if @name_keys.nil? and @name_key_pattern.nil?
    raise Fluent::ConfigError, "missing both of name_keys and name_key_pattern"
  end
  if not @name_keys.nil? and not @name_key_pattern.nil?
    raise Fluent::ConfigError, "cannot specify both of name_keys and name_key_pattern"
  end
  if not @graphs.nil? and @name_keys.nil?
    raise Fluent::ConfigError, "graphs must be specified with name_keys"
  end

  if @name_keys
    @name_keys = @name_keys.split(',')
  end
  if @name_key_pattern
    @name_key_pattern = Regexp.new(@name_key_pattern)
  end

  if @graphs
    @graphs = @graphs.split(',')
  end
  if @name_keys and @graphs and @name_keys.size != @graphs.size
    raise Fluent::ConfigError, "sizes of name_keys and graphs do not match"
  end

  @mode = case @mode
          when 'count' then :count
          when 'modified' then :modified
          else
            :gauge
          end

  @tag_for = case @tag_for
             when 'ignore' then :ignore
             when 'section' then :section
             when 'service' then :service
             else
               :name_prefix
             end
  if @graph_path.nil?
    if @tag_for != :section and @section.nil?
      raise Fluent::ConfigError, "section parameter is needed when tag_for is not 'section'"
    end
    if @tag_for != :service and @service.nil?
      raise Fluent::ConfigError, "service parameter is needed when tag_for is not 'service'"
    end
    @graph_path = DEFAULT_GRAPH_PATH[@tag_for]
  end

  if @remove_prefix
    @removed_prefix_string = @remove_prefix + '.'
    @removed_length = @removed_prefix_string.length
  end

  @auth = case @authentication
          when 'basic' then :basic
          else
            :none
          end
  @resolver = Resolve::Hostname.new(:system_resolver => true)
end

#connect_to(tag, name) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 214

def connect_to(tag, name)
  url = URI.parse(format_url(tag,name))
  return url.host, url.port
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 312

def emit(tag, es, chain)
  events = []
  if @name_keys
    es.each {|time,record|
      @name_keys.each_with_index {|name, i|
        if value = record[name]
          events.push({:tag => tag, :name => (@graphs ? @graphs[i] : name), :value => value})
        end
      }
    }
  else # for name_key_pattern
    es.each {|time,record|
      record.keys.each {|key|
        if @name_key_pattern.match(key) and record[key]
          events.push({:tag => tag, :name => key, :value => record[key]})
        end
      }
    }
  end
  if @thread
    @mutex.synchronize do
      @queue += events
    end
  else
    begin
      post_events(events)
    rescue => e
      log.warn "HTTP POST Error occures to growthforecast server", :error_class => e.class, :error => e.message
      raise if @retry
    end
  end

  chain.next
end

#format_url(tag, name) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 209

def format_url(tag, name)
  graph_path = @graph_path.gsub(/(\${[_a-z]+})/, placeholder_mapping(tag, name))
  return @gfapi_url + URI.escape(graph_path)
end

#http_connection(host, port) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 219

def http_connection(host, port)
  http = Net::HTTP.new(@resolver.getaddress(host), port)
  if @timeout
    http.open_timeout = @timeout
    http.read_timeout = @timeout
  end
  if @ssl
    http.use_ssl = true
    unless @verify_ssl
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE
    end
  end
  http
end

#placeholder_mapping(tag, name) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 201

def placeholder_mapping(tag, name)
  if @remove_prefix and
      ( (tag.start_with?(@removed_prefix_string) and tag.length > @removed_length) or tag == @remove_prefix)
    tag = tag[@removed_length..-1]
  end
  {'${service}' => @service, '${section}' => @section, '${tag}' => tag, '${key_name}' => name}
end

#post(tag, name, value) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 249

def post(tag, name, value)
  url = format_url(tag,name)
  res = nil
  begin
    host,port = connect_to(tag, name)
    req = post_request(tag, name, value)
    http = http_connection(host, port)
    res = http.start {|http| http.request(req) }
  rescue IOError, EOFError, SystemCallError
    # server didn't respond
    log.warn "net/http POST raises exception: #{$!.class}, '#{$!.message}'"
  end
  unless res and res.is_a?(Net::HTTPSuccess)
    log.warn "failed to post to growthforecast: #{url}, number: #{value}, code: #{res && res.code}"
  end
end

#post_events(events) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 302

def post_events(events)
  if @keepalive
    post_keepalive(events)
  else
    events.each do |event|
      post(event[:tag], event[:name], event[:value])
    end
  end
end

#post_keepalive(events) ⇒ Object

:tag=>”,:name=>”,:value=>X


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# File 'lib/fluent/plugin/out_growthforecast.rb', line 266

def post_keepalive(events) # [{:tag=>'',:name=>'',:value=>X}]
  return if events.size < 1

  # gf host/port is same for all events (host is from configuration)
  host,port = connect_to(events.first[:tag], events.first[:name])

  requests = events.map{|e| post_request(e[:tag], e[:name], e[:value])}

  http = nil
  requests.each do |req|
    begin
      unless http
        http = http_connection(host, port)
        http.start
      end
      res = http.request(req)
      unless res and res.is_a?(Net::HTTPSuccess)
        log.warn "failed to post to growthforecast: #{host}:#{port}#{req.path}, post_data: #{req.body} code: #{res && res.code}"
      end
    rescue IOError, EOFError, Errno::ECONNRESET, Errno::ETIMEDOUT, SystemCallError
      log.warn "net/http keepalive POST raises exception: #{$!.class}, '#{$!.message}'"
      begin
        http.finish
      rescue => e
        # ignore all errors for connection with error
      end
      http = nil
    end
  end
  begin
    http.finish
  rescue => e
    # ignore
  end
end

#post_request(tag, name, value) ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 234

def post_request(tag, name, value)
  url = URI.parse(format_url(tag,name))
  req = Net::HTTP::Post.new(url.path)
  if @auth and @auth == :basic
    req.basic_auth(@username, @password)
  end
  req['Host'] = url.host
  if @keepalive
    req['Connection'] = 'Keep-Alive'
  end
  value = @enable_float_number ? value.to_f : value.to_i
  req.set_form_data({'number' => value, 'mode' => @mode.to_s})
  req
end

#poster ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 182

def poster
  while @running
    if @queue.size < 1
      sleep(0.2)
      next
    end

    events = @mutex.synchronize {
      es,@queue = @queue,[]
      es
    }
    begin
      post_events(events) if events.size > 0
    rescue => e
      log.warn "HTTP POST in background Error occures to growthforecast server", :error_class => e.class, :error => e.message
    end
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 176

def shutdown
  @running = false
  @thread.join if @thread
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_growthforecast.rb', line 162

def start
  super

  @running = true
  @thread = nil
  @queue = nil
  @mutex = nil
  if @background_post
    @mutex = Mutex.new
    @queue = []
    @thread = Thread.new(&method(:poster))
  end
end