# Copyright 2016 FUJITSU LIMITED
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.


input {
    kafka {
        bootstrap_servers => "%KAFKA_SERVICE_HOST%:%KAFKA_SERVICE_PORT%"
        topics => ["transformed-log"]
        group_id => "log-metric"
        client_id => "monasca_log_metrics"
        consumer_threads => 4
        codec => json
    }
}


filter {

  # drop logs that have not set log level
  if ![log][level] {
    drop { periodic_flush => true }
  } else {
    ruby {
      code => "
        log_level = event.get('[log][level]').downcase
        event.set('[log][level]', log_level)
      "
    }
  }

  # drop logs with log level not in warning,error
  if [log][level] not in [warning,error] {
    drop { periodic_flush => true }
  }

  ruby {
    code => "
      log_level = event.get('[log][level]').downcase
      log_ts = Time.now.to_f * 1000.0

      # metric name
      metric_name = 'log.%s' % log_level

      # build metric
      metric = {}
      metric['name'] = metric_name
      metric['timestamp'] = log_ts
      metric['value'] = 1
      metric['dimensions'] = event.get('[log][dimensions]')
      metric['value_meta'] = {}

      event.set('[metric]',metric.to_hash)
    "
  }

  mutate {
    remove_field => ["log", "@version", "@timestamp", "log_level_original", "tags"]
  }

}


output {
  kafka {
    bootstrap_servers => "%KAFKA_SERVICE_HOST%:%KAFKA_SERVICE_PORT%"
    topic_id => "metrics"
    client_id => "monasca_log_metrics"
    compression_type => "none"
    codec => json
  }
}