Class: One2Influx::Influx

Inherits:
Object
  • Object
show all
Defined in:
lib/one2influx/influx.rb

Overview

Used for storing data to InfluxDB through HTTP API

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Influx

Initializes class Influx.

Raises:

  • (Exception) —

    in case of error while getting UUID



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# File 'lib/one2influx/influx.rb', line 6

def initialize
  @authenticate = $CFG.influx[:authenticate]
  if @authenticate
    creds = $CFG.influx[:credentials].split(':')
    raise 'InfluxDB credentials have invalid form!' if creds.length != 2
    @user = creds[0]
    @pass = creds[1]
  end
  uri = URI.parse($CFG.influx[:endpoint])
  @host = uri.host
  @port = uri.port
  @db = $CFG.influx[:database]
  @retention_policy = $CFG.influx[:policy]
end

Instance Method Details

#db_exists? ⇒ boolean

Checks whether InfluxDB connection is possible, database @db exists and @retention_policy exists.

Returns:

  • (boolean) 


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# File 'lib/one2influx/influx.rb', line 57

def db_exists?
  uri = URI('/query')
  query = {:q => "SHOW RETENTION POLICIES #{@db}"}
  uri.query = URI.encode_www_form(query)

  req = Net::HTTP::Get.new(uri.to_s)

  response =  make_request(req)

  # Was request successful?
  if response.nil?
    return false
  end

  # Check for invalid HTTP response codes
  if response.code.to_i == 401
    $LOG.error "Unauthorized user '#{@user}', unable to verify connection" +
                   ' to InfluxDB.'
    return false
  elsif response.code.to_i != 200
    $LOG.error 'Failed to store data to InfluxDB. Received HTTP code ' +
                   "#{response.code}, body: #{response.body}"
    return false
  end

  # Parse response
  begin
    response = JSON.parse(response.body)
  rescue JSON::ParserError => e
    $LOG.error 'Unable to parse InfluxDB response, while verifying ' +
                   "connection to database '#{@db}': #{e}. " +
                   "Received: #{response.body}"
    return false
  end

  begin
    if response['results'][0].has_key? 'error'
      $LOG.error "Unable to verify connection to InfluxDB database '#{@db}'" +
                     " with message: #{response['results'][0]['error']}"
      return false
    end

    response['results'][0]['series'][0]['values'].each do |policy|
      if policy[0] == @retention_policy
        $LOG.info "Connection to InfluxDB database '#{@db}' with retention " +
                      "policy '#{@retention_policy}' verified."
        return true
      end
    end
  rescue Exception
    # Handle index out of bounds etc. exceptions
    $LOG.error "Unable to verify connection to InfluxDB database '#{@db}'. " +
                   'Invalid InfluxDB response format.'
    return false
  end
  $LOG.error "InfluxDB database '#{@db}' does not contain supplied " +
                 "retention policy '#{@retention_policy}'."

  return false
end

#store(points) ⇒ Object

Parameters:

  • points (hash) —

    returned by OneObject.serialize_as_points

Raises:

  • (Exception) —

    in case of unsuccessful storing



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# File 'lib/one2influx/influx.rb', line 24

def store(points)
  # Split points by 2500 for better performance
  points.each_slice(2500).to_a.each do |slice|
    # Default InfluxDB payload form
    payload = {
        :database => @db,
        :retentionPolicy => @retention_policy,
        :points => slice
    }
    # puts "Total number of points is #{points.length}"

    # Create InfluxDB write request
    req = Net::HTTP::Post.new(
        '/write',
        initheader = {
            'Content-Type' => 'application/json'
        }
    )

    req.body = payload.to_json
    response = make_request(req)

    if (not response.nil?) && (response.code != '204')
      raise 'Failed to store data to InfluxDB. Received HTTP code ' +
                "#{response.code}, body: #{response.body}"
    end
    $LOG.info "Successfully stored #{slice.length} data points."
  end
end