Class: LogStash::Outputs::Mongodb

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/outputs/mongodb.rb

Overview

This output writes events to MongoDB.

Constant Summary collapse

@@mutex =

Mutex used to synchronize access to ‘documents’

Mutex.new

Instance Method Summary collapse

Instance Method Details

#close ⇒ Object 



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# File 'lib/logstash/outputs/mongodb.rb', line 129

def close
  @closed.make_true
  @bulk_thread.wakeup
  @bulk_thread.join
end

#receive(event) ⇒ Object 



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# File 'lib/logstash/outputs/mongodb.rb', line 77

def receive(event)
  begin
    # Our timestamp object now has a to_bson method, using it here
    # {}.merge(other) so we don't taint the event hash innards
    document = {}.merge(event.to_hash)

    if !@isodate
      timestamp = event.timestamp
      if timestamp
        # not using timestamp.to_bson
        document["@timestamp"] = timestamp.to_json
      else
        @logger.warn("Cannot set MongoDB document `@timestamp` field because it does not exist in the event", :event => event)
      end
    end

    if @generateId
      document["_id"] = BSON::ObjectId.new
    end

    if @bulk
      collection = event.sprintf(@collection)
      @@mutex.synchronize do
        if(!@documents[collection])
          @documents[collection] = []
        end
        @documents[collection].push(document)

        if(@documents[collection].length >= @bulk_size)
          @db[collection].insert_many(@documents[collection])
          @documents.delete(collection)
        end
      end
    else
      @db[event.sprintf(@collection)].insert_one(document)
    end
  rescue => e
    if e.message =~ /^E11000/
      # On a duplicate key error, skip the insert.
      # We could check if the duplicate key err is the _id key
      # and generate a new primary key.
      # If the duplicate key error is on another field, we have no way
      # to fix the issue.
      @logger.warn("Skipping insert because of a duplicate key error", :event => event, :exception => e)
    else
      @logger.warn("Failed to send event to MongoDB, retrying in #{@retry_delay.to_s} seconds", :event => event, :exception => e)
      sleep(@retry_delay)
      retry
    end
  end
end

#register ⇒ Object 



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# File 'lib/logstash/outputs/mongodb.rb', line 49

def register
  if @bulk_size > 1000
    raise LogStash::ConfigurationError, "Bulk size must be lower than '1000', currently '#{@bulk_size}'"
  end

  Mongo::Logger.logger = @logger
  conn = Mongo::Client.new(@uri)
  @db = conn.use(@database)

  @closed = Concurrent::AtomicBoolean.new(false)
  @documents = {}

  @bulk_thread = Thread.new(@bulk_interval) do |bulk_interval|
    while @closed.false? do
      sleep(bulk_interval)

      @@mutex.synchronize do
        @documents.each do |collection, values|
          if values.length > 0
            @db[collection].insert_many(values)
            @documents.delete(collection)
          end
        end
      end
    end
  end
end