Class: Circonus

Inherits:
Object
  • Object
show all
Defined in:
lib/circonus.rb

Defined Under Namespace

Classes: Timeout

Constant Summary collapse

DEFAULT_OPTIONS = 
{
  :timeout => 300,
  :open_timeout => 300
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(apitoken, appname, agent = nil, options = {}) ⇒ Circonus

Returns a new instance of Circonus.



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# File 'lib/circonus.rb', line 37

def initialize(apitoken,appname,agent=nil, options={})
  @apitoken = apitoken
  @debug = true
  @raise_errors = false
  @appname = appname
  @agent = agent
  @headers = {
    "X-Circonus-Auth-Token" => @apitoken,
    "X-Circonus-App-Name" => @appname,
    "Accept" => 'application/json'
  }
  @url_prefix = "https://api.circonus.com/v2/"
  @options = DEFAULT_OPTIONS.merge(options)
end

Instance Attribute Details

#agent ⇒ Object

Returns the value of attribute agent.



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# File 'lib/circonus.rb', line 13

def agent
  @agent
end

#debug ⇒ Object

Returns the value of attribute debug.



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# File 'lib/circonus.rb', line 15

def debug
  @debug
end

#raise_errors ⇒ Object

Returns the value of attribute raise_errors.



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# File 'lib/circonus.rb', line 14

def raise_errors
  @raise_errors
end

Instance Method Details

#_composite_formula(formula, graph) ⇒ Object 



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# File 'lib/circonus.rb', line 183

def _composite_formula(formula,graph)
  formula = formula.clone
  formula.tr!('^A-Za-z0-9/+.*_)(-','' ) # prevent injection
  formula.tr!('A-Z','a-z')
  formula.gsub!(/[a-z]+/) { |n| "var_#{n}" } # prevent clobbering of ruby keywords
  dps = graph['datapoints']
  ndps = dps.length
  nvals = dps.first['data'].length
  data = []
  (0...nvals).each do |n|
    evalstr = ""
    ('a'..'zzzz').each_with_index do |x,i|
      break if i == ndps
      evalstr += "var_#{x}=#{dps[i]['data'][n].last.to_f.to_s}\n" # force an s->i->s conversion to prevent injection in the values
    end
    res = eval "#{evalstr}\n#{formula}\n"
    data[n] = [dps.first['data'][n].first,res]
  end
  return data
end

#_data_derive(data, datapoint) ⇒ Object 



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# File 'lib/circonus.rb', line 175

def _data_derive(data,datapoint)
  derive = datapoint['derive']
  derive = 'value' if derive == 'gauge'
  data = data.map { |m| [m[0],(m[1] ? m[1][derive] : nil)] }
  data = _data_formula(datapoint['data_formula'],data) if datapoint['data_formula']
  return data
end

#_data_formula(formula, data) ⇒ Object 



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# File 'lib/circonus.rb', line 162

def _data_formula(formula,data)
  vals = []
  formula = formula.clone
  formula.tr!('^A-Za-z0-9/+.*_)(-','' ) # prevent injection
  formula.tr!('A-Z','a-z')
  formula.gsub!(/[a-z]+/) { |n| "var_#{n}" } # prevent clobbering of ruby keywords
  data.each_with_index do |v,i|
    res = eval "var_val=#{v[1]}\n#{formula}\n"
    vals[i] = [v[0],res]
  end
  return vals
end

#_rest(type, url, headers, data = nil) ⇒ Object 



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# File 'lib/circonus.rb', line 52

def _rest(type,url,headers,data=nil)
  #STDERR.puts "_rest: type=#{type} url=#{url} headers=#{headers.inspect} data=#{data.inspect}"
  begin
    resource = RestClient::Resource.new url, :timeout => @options[:timeout], :open_timeout => @options[:open_timeout]
    case type
    when 'delete'
      r = resource.delete headers
    when 'post'
      r = resource.post Yajl::Encoder.encode(data), headers
    when 'put'
      r = resource.put Yajl::Encoder.encode(data), headers
    else 'get'
      r = resource.get headers
    end
  rescue RestClient::Forbidden,RestClient::BadRequest,RestClient::InternalServerError,RestClient::MethodNotAllowed => e
    err = Yajl::Parser.parse(e.response)
    print "Error (#{e.http_code}): ",err['error']," [#{e.http_body}]\n" if @debug
    raise if @raise_errors
    return nil,err
  rescue RestClient::RequestTimeout
    raise Circonus::Timeout
  end
  return r
end

#add(method, data) ⇒ Object 



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# File 'lib/circonus.rb', line 94

def add(method,data)
  r, err = _rest('post',@url_prefix + method, @headers, data)
  return nil,err if r.nil?
  return Yajl::Parser.parse(r)
end

#delete(method, id) ⇒ Object 



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# File 'lib/circonus.rb', line 86

def delete(method,id)
  cid = id.to_s.split('/').last
  url = @url_prefix + method + '/' + URI.escape(cid)
  r,err = _rest('delete',url, @headers)
  return nil,err if r.nil?
  return Yajl::Parser.parse(r)
end

#get(method, id) ⇒ Object 



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# File 'lib/circonus.rb', line 77

def get(method,id)
  cid = id.to_s.split('/').last
  url = @url_prefix + method + '/' + URI.escape(cid)
  #print "url=#{url}\n"
  r,err = _rest('get',url, @headers)
  return nil,err if r.nil?
  return Yajl::Parser.parse(r)
end

#get_data(cid, metric, params = {}) ⇒ Object

extraction of time ranged data (this one is a bit different from the other v2 ones)



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# File 'lib/circonus.rb', line 150

def get_data(cid,metric,params = {})
  params['start'] = (Time.now - 3600).to_i unless params.has_key? 'start'
  params['end'] = Time.now.to_i unless params.has_key? 'end'
  params['period'] = 300 unless params.has_key? 'period'
  params['type'] = 'numeric' unless params.has_key? 'type'
  url = @url_prefix + 'data' + '/' + URI.escape(cid.to_s.split('/').last) + '_' + URI::escape(metric)
  headers = @headers.merge({:params => params})
  r,err = _rest('get',url, headers)
  return nil,err if r.nil?
  return Yajl::Parser.parse(r)
end

#get_graph_data(gid, t_start = nil, t_end = nil) ⇒ Object

Get the range of data values from start to end time This calculates out the datapoints and composites using the formulas in each graph –TODO This is very slow at the moment.……



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# File 'lib/circonus.rb', line 207

def get_graph_data(gid,t_start=nil,t_end=nil)
  t_end ||= Time.new.to_i
  t_start ||= (t_end - 600)
  g = get_graph(gid)
  params = {'end'=>t_end.to_i,'start'=>t_start.to_i}
  g['datapoints'].each do |dp|
    res = get_data(dp['check_id'],dp['metric_name'],params)
    data = res['data']
    dp['data'] = _data_derive(data,dp)
  end
  g['composites'].each do |cmp|
    cmp['data'] = _composite_formula(cmp['data_formula'],g)
  end
  return g
end

#list(method, filter = nil) ⇒ Object 



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# File 'lib/circonus.rb', line 107

def list(method,filter=nil)
  url = @url_prefix + method
  if (not filter.nil?) and filter.any?
    query_string = filter.map { |k,v| [v].flatten.map { |val|"f_#{URI::escape(k)}=#{URI::escape(val)}" } }.flatten.join('&')
    url += '?' + query_string
  end
  r, err = _rest('get',url,@headers)
  return nil,err if r.nil?
  return Yajl::Parser.parse(r)
end

#set_apitoken(apitoken) ⇒ Object 



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# File 'lib/circonus.rb', line 25

def set_apitoken(apitoken)
  @apitoken = apitoken
end

#set_appname(appname) ⇒ Object 



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# File 'lib/circonus.rb', line 29

def set_appname(appname)
  @appname = appname
end

#set_server(server) ⇒ Object 



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# File 'lib/circonus.rb', line 33

def set_server(server)
  @url_prefix = "https://#{server}/v2/"
end

#update(method, id, data) ⇒ Object 



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# File 'lib/circonus.rb', line 100

def update(method,id,data)
  cid = id.to_s.split('/').last
  r, err = _rest('put',@url_prefix + method + '/' + URI.escape(cid), @headers, data)
  return nil,err if r.nil?
  return Yajl::Parser.parse(r)
end