Class: LogStash::Inputs::Multirds

Inherits:
Base
  • Object
show all
Includes:
PluginMixins::AwsConfig::V2
Defined in:
lib/logstash/inputs/multirds.rb

Defined Under Namespace

Modules: SinceDB

Instance Method Summary collapse

Instance Method Details

#acquire_lock(db, table, id, lock_owner, expire_time: 10) ⇒ Object 



66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
 
# File 'lib/logstash/inputs/multirds.rb', line 66

def acquire_lock(db, table, id, lock_owner, expire_time: 10)
  begin
      db.update_item({
          key: {
              id: id
          },
          table_name: table,
          update_expression: "SET lock_owner = :lock_owner, expires = :expires",
          expression_attribute_values: {
              ':lock_owner' => lock_owner,
              ':expires' =>  Time.now.utc.to_i + expire_time
          },
          return_values: "UPDATED_NEW",
          condition_expression: "attribute_not_exists(lock_owner) OR lock_owner = :lock_owner OR expires < :expires"
      })
  rescue => e
    @logger.error "logstash-input-multirds acquire_lock exception\n #{e}"
  end
end

#ensure_lock_table(db, table) ⇒ Object 



25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
 
# File 'lib/logstash/inputs/multirds.rb', line 25

def ensure_lock_table(db, table)
  begin
      tables = db.list_tables({

      })
      return true if tables.to_h[:table_names].to_a.include?(table)
      # TODO: there is a potential race condition here where a table could come back in list_tables but not be in ACTIVE state we should check this better
      result = db.create_table({
          table_name: table,
          key_schema: [
              {
                  attribute_name: 'id',
                  key_type: 'HASH'
              }
          ],
          attribute_definitions: [
              {
                  attribute_name: 'id',
                  attribute_type: 'S'
              }
          ],
          provisioned_throughput: {
              read_capacity_units: 10,
              write_capacity_units: 10
          }
      })

      # wait here for the table to be ready
      (1..10).each do |i|
          sleep i
          rsp = db.describe_table({
              table_name: table
          })
          return true if rsp.to_h[:table][:table_status] == 'ACTIVE'
      end
  rescue => e
      @logger.error "logstash-input-multirds ensure_lock_table exception\n #{e}"
      return false
  end
  return false
end

#filename2datetime(name) ⇒ Object 



189
190
191
192
 
# File 'lib/logstash/inputs/multirds.rb', line 189

def filename2datetime(name)
  parts = name.match /(\d{4})-(\d{2})-(\d{2})-(\d{2})$/
  Time.utc parts[1], parts[2], parts[3], parts[4]
end

#get_logfile_list(rds, instance_pattern, logfile_pattern) ⇒ Object 



85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
 
# File 'lib/logstash/inputs/multirds.rb', line 85

def get_logfile_list(rds, instance_pattern, logfile_pattern)
    log_files = []
    begin
      dbs = rds.describe_db_instances
      dbs.to_h[:db_instances].each do |db|
          next unless db[:db_instance_identifier] =~ /#{instance_pattern}/
          logs = rds.describe_db_log_files({
              db_instance_identifier: db[:db_instance_identifier]
          })

          logs.to_h[:describe_db_log_files].each do |log|
              next unless log[:log_file_name] =~ /#{logfile_pattern}/
              log[:db_instance_identifier] = db[:db_instance_identifier]
              log_files.push(log)
          end
      end
    rescue => e
      @logger.error "logstash-input-multirds get_logfile_list instance_pattern: #{instance_pattern} logfile_pattern:#{logfile_pattern} exception \n#{e}"
    end
    log_files
end

#get_logfile_record(db, id, tablename) ⇒ Object 



106
107
108
109
110
111
112
113
114
115
 
# File 'lib/logstash/inputs/multirds.rb', line 106

def get_logfile_record(db, id, tablename)
  res = db.get_item({
      key: {
          id: id
      },
      table_name: tablename
  })
  extra_fields = {'marker' => '0:0'}
  extra_fields.merge(res.item)
end

#register ⇒ Object 



131
132
133
134
135
136
137
138
139
 
# File 'lib/logstash/inputs/multirds.rb', line 131

def register
  @client_id = "#{Socket.gethostname}:#{java.util::UUID.randomUUID.to_s}" unless @client_id
  @logger.info "Registering multi-rds input", :instance_name_pattern => @instance_name_pattern, :log_file_name_pattern => @log_file_name_pattern, :group_name => @group_name, :region => @region, :client_id => @client_id

  @db = Aws::DynamoDB::Client.new aws_options_hash
  @rds = Aws::RDS::Client.new aws_options_hash

  @ready = ensure_lock_table @db, @group_name
end

#run(queue) ⇒ Object 



141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
 
# File 'lib/logstash/inputs/multirds.rb', line 141

def run(queue)
  if !@ready
    @logger.warn "multi-rds dynamodb lock table not ready, unable to proceed"
    return false
  end
  @thread = Thread.current
  Stud.interval(@polling_frequency) do
    logs = get_logfile_list @rds, @instance_name_pattern, @log_file_name_pattern

    logs.each do |log|
      id = "#{log[:db_instance_identifier]}:#{log[:log_file_name]}"
      lock = acquire_lock @db, @group_name, id, @client_id
      next unless lock # we won't do anything with the data unless we get a lock on the file
      
      rec = get_logfile_record @db, id, @group_name
      next unless rec['marker'].split(':')[1].to_i < log[:size].to_i # No new data in the log file so just continue

      # start reading log data at the marker
      more = true
      marker = rec[:marker]
      while more do
          rsp = @rds.download_db_log_file_portion(
              db_instance_identifier: log[:db_instance_identifier],
              log_file_name: log[:log_file_name],
              marker: rec[:marker],
          )
          rsp[:log_file_data].lines.each do |line|
            @codec.decode(line) do |event|
              decorate event
              event.set "rds_instance", log[:db_instance_identifier]
              event.set "log_file", log[:log_file_name]
              queue << event
            end
          end
          more = rsp[:additional_data_pending]
          marker = rsp[:marker] 
      end
      # set the marker back in the lock table
      set_logfile_record @db, id, @group_name, 'marker', marker
    end
  end

end

#set_logfile_record(db, id, tablename, key, value) ⇒ Object 



116
117
118
119
120
121
122
123
124
125
126
127
128
129
 
# File 'lib/logstash/inputs/multirds.rb', line 116

def set_logfile_record(db, id, tablename, key, value)
  db.update_item({
      key: {
          id: id
      },
      table_name: tablename,
      update_expression: "SET #{key} = :v",
      expression_attribute_values: {
          ':v' => value
      },
      return_values: "UPDATED_NEW"
  
  })
end

#stop ⇒ Object 



185
186
187
 
# File 'lib/logstash/inputs/multirds.rb', line 185

def stop
  Stud.stop! @thread
end