Class: Embulk::Input::Prometheus

Inherits:
InputPlugin
  • Object
show all
Defined in:
lib/embulk/input/prometheus.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.resume(task, columns, count, &control) ⇒ Object 



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# File 'lib/embulk/input/prometheus.rb', line 36

def self.resume(task, columns, count, &control)
  task_reports = yield(task, columns, count)

  next_config_diff = {}
  return next_config_diff
end

.transaction(config, &control) ⇒ Object 



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# File 'lib/embulk/input/prometheus.rb', line 12

def self.transaction(config, &control)
  task = {
    "url" => config.param("url", :string, default: 'http://localhost:9090/api/v1/'),
    "query" => config.param("query", :string),
    "since" => config.param("since", :integer, default: 0),
    "start_at" => config.param("start_at", :string, default: nil),
    "end_at" => config.param("end_at", :string, default: nil),
    "step" => config.param("step", :integer),
    "element_key" => config.param("element_key", :string, default: 'instance'),
    "tls" => config.param("tls", :hash, default: nil),
    "token" => config.param("token", :string,  default: nil),
    "timeout" => config.param("timeout", :interger, default: 60),
    "open_timeout" => config.param("open_timeout", :interger, default: 10),
  }

  columns = [
    Column.new(0, "name", :string),
    Column.new(1, "time", :long),
    Column.new(2, "value", :double),
  ]

  resume(task, columns, 1, &control)
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/embulk/input/prometheus.rb', line 43

def run
  params = {
    url: task['url'],
    options: {},
    ssl: {},
    credentials: {},
  }

  if task["tls"]
    params[:ssl][:client_cert] = OpenSSL::X509::Certificate.new(File.read(task["tls"]["cert_path"])) if task["tls"]["cert_path"]
    params[:ssl][:client_key] = OpenSSL::PKey::RSA.new(File.read(task["tls"]["key_path"])) if task["tls"]["key_path"]
    params[:ssl][:ca_file] = task["tls"]["ca_path"] if task["tls"]["ca_path"]
  end
  params[:credentials][:token] = task["token"] if task["token"]

  %w(
    open_timeout
    timeout
  ).each do |n|
    params[:options][n.to_sym] =  task[n] if task[n]
  end

  start_at = if task['start_at'] && !task['start_at'].empty?
               Time.parse(task['start_at'])
             else
               Time.now - task['since']
             end
  end_at   = if task['end_at'] && !task['end_at'].empty?
               Time.parse(task['end_at'])
             else
               Time.now
             end

  result = JSON.parse(::Prometheus::ApiClient.client(params).get(
    'query_range',
    query: task['query'],
    start: start_at.strftime("%Y-%m-%dT%H:%M:%S.%LZ"),
    end:   end_at.strftime("%Y-%m-%dT%H:%M:%S.%LZ"),
    step:  "#{task['step']}s",
  ).body)

  result['data']['result'].each do |r|
    r["values"].each do |v|
      page_builder.add([r["metric"][task["element_key"]], v[0], v[1]])
    end
  end if result['status'] == 'success'

  page_builder.finish
  task_report = {}
  return task_report
end