logstash-output-jdbc/lib/logstash/outputs/jdbc.rb
2017-04-09 09:17:05 +01:00

339 lines
11 KiB
Ruby

# encoding: utf-8
require 'logstash/outputs/base'
require 'logstash/namespace'
require 'concurrent'
require 'stud/interval'
require 'java'
require 'logstash-output-jdbc_jars'
require 'json'
# Write events to a SQL engine, using JDBC.
#
# It is upto the user of the plugin to correctly configure the plugin. This
# includes correctly crafting the SQL statement, and matching the number of
# parameters correctly.
class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
concurrency :shared
STRFTIME_FMT = '%Y-%m-%d %T.%L'.freeze
RETRYABLE_SQLSTATE_CLASSES = [
# Classes of retryable SQLSTATE codes
# Not all in the class will be retryable. However, this is the best that
# we've got right now.
# If a custom state code is required, set it in retry_sql_states.
'08', # Connection Exception
'24', # Invalid Cursor State (Maybe retry-able in some circumstances)
'25', # Invalid Transaction State
'40', # Transaction Rollback
'53', # Insufficient Resources
'54', # Program Limit Exceeded (MAYBE)
'55', # Object Not In Prerequisite State
'57', # Operator Intervention
'58', # System Error
].freeze
config_name 'jdbc'
# Driver class - Reintroduced for https://github.com/theangryangel/logstash-output-jdbc/issues/26
config :driver_class, validate: :string
# Does the JDBC driver support autocommit?
config :driver_auto_commit, validate: :boolean, default: true, required: true
# Where to find the jar
# Defaults to not required, and to the original behaviour
config :driver_jar_path, validate: :string, required: false
# jdbc connection string
config :connection_string, validate: :string, required: true
# jdbc username - optional, maybe in the connection string
config :username, validate: :string, required: false
# jdbc password - optional, maybe in the connection string
config :password, validate: :string, required: false
# [ "insert into table (message) values(?)", "%{message}" ]
config :statement, validate: :array, required: true
# If this is an unsafe statement, use event.sprintf
# This also has potential performance penalties due to having to create a
# new statement for each event, rather than adding to the batch and issuing
# multiple inserts in 1 go
config :unsafe_statement, validate: :boolean, default: false
# Number of connections in the pool to maintain
config :max_pool_size, validate: :number, default: 24
# Connection timeout
config :connection_timeout, validate: :number, default: 10000
# We buffer a certain number of events before flushing that out to SQL.
# This setting controls how many events will be buffered before sending a
# batch of events.
config :flush_size, validate: :number, default: 1000
# Set initial interval in seconds between retries. Doubled on each retry up to `retry_max_interval`
config :retry_initial_interval, validate: :number, default: 2
# Maximum time between retries, in seconds
config :retry_max_interval, validate: :number, default: 128
# Any additional custom, retryable SQL state codes.
# Suitable for configuring retryable custom JDBC SQL state codes.
config :retry_sql_states, validate: :array, default: []
# Run a connection test on start.
config :connection_test, validate: :boolean, default: true
# Connection test and init string, required for some JDBC endpoints
# notable phoenix-thin - see logstash-output-jdbc issue #60
config :connection_test_query, validate: :string, required: false
# Maximum number of sequential failed attempts, before we stop retrying.
# If set to < 1, then it will infinitely retry.
# At the default values this is a little over 10 minutes
config :max_flush_exceptions, validate: :number, default: 10
config :max_repeat_exceptions, obsolete: 'This has been replaced by max_flush_exceptions - which behaves slightly differently. Please check the documentation.'
config :max_repeat_exceptions_time, obsolete: 'This is no longer required'
config :idle_flush_time, obsolete: 'No longer necessary under Logstash v5'
def register
@logger.info('JDBC - Starting up')
load_jar_files!
@stopping = Concurrent::AtomicBoolean.new(false)
@logger.warn('JDBC - Flush size is set to > 1000') if @flush_size > 1000
if @statement.empty?
@logger.error('JDBC - No statement provided. Configuration error.')
end
if !@unsafe_statement && @statement.length < 2
@logger.error("JDBC - Statement has no parameters. No events will be inserted into SQL as you're not passing any event data. Likely configuration error.")
end
setup_and_test_pool!
end
def multi_receive(events)
events.each_slice(@flush_size) do |slice|
retrying_submit(slice)
end
end
def close
@stopping.make_true
@pool.close
super
end
private
def setup_and_test_pool!
# Setup pool
@pool = Java::ComZaxxerHikari::HikariDataSource.new
@pool.setAutoCommit(@driver_auto_commit)
@pool.setDriverClassName(@driver_class) if @driver_class
@pool.setJdbcUrl(@connection_string)
@pool.setUsername(@username) if @username
@pool.setPassword(@password) if @password
@pool.setMaximumPoolSize(@max_pool_size)
@pool.setConnectionTimeout(@connection_timeout)
validate_connection_timeout = (@connection_timeout / 1000) / 2
if !@connection_test_query.nil? and @connection_test_query.length > 1
@pool.setConnectionTestQuery(@connection_test_query)
@pool.setConnectionInitSql(@connection_test_query)
end
return unless @connection_test
# Test connection
test_connection = @pool.getConnection
unless test_connection.isValid(validate_connection_timeout)
@logger.warn('JDBC - Connection is not reporting as validate. Either connection is invalid, or driver is not getting the appropriate response.')
end
test_connection.close
end
def load_jar_files!
# Load jar from driver path
unless @driver_jar_path.nil?
raise LogStash::ConfigurationError, 'JDBC - Could not find jar file at given path. Check config.' unless File.exist? @driver_jar_path
require @driver_jar_path
return
end
# Revert original behaviour of loading from vendor directory
# if no path given
jarpath = if ENV['LOGSTASH_HOME']
File.join(ENV['LOGSTASH_HOME'], '/vendor/jar/jdbc/*.jar')
else
File.join(File.dirname(__FILE__), '../../../vendor/jar/jdbc/*.jar')
end
@logger.trace('JDBC - jarpath', path: jarpath)
jars = Dir[jarpath]
raise LogStash::ConfigurationError, 'JDBC - No jars found. Have you read the README?' if jars.empty?
jars.each do |jar|
@logger.trace('JDBC - Loaded jar', jar: jar)
require jar
end
end
def submit(events)
connection = nil
statement = nil
events_to_retry = []
begin
connection = @pool.getConnection
rescue => e
log_jdbc_exception(e, true)
# If a connection is not available, then the server has gone away
# We're not counting that towards our retry count.
return events, false
end
events.each do |event|
begin
statement = connection.prepareStatement(
(@unsafe_statement == true) ? event.sprintf(@statement[0]) : @statement[0]
)
statement = add_statement_event_params(statement, event) if @statement.length > 1
statement.execute
rescue => e
if retry_exception?(e)
events_to_retry.push(event)
end
ensure
statement.close unless statement.nil?
end
end
connection.close unless connection.nil?
return events_to_retry, true
end
def retrying_submit(actions)
# Initially we submit the full list of actions
submit_actions = actions
count_as_attempt = true
attempts = 1
sleep_interval = @retry_initial_interval
while @stopping.false? and (submit_actions and !submit_actions.empty?)
return if !submit_actions || submit_actions.empty? # If everything's a success we move along
# We retry whatever didn't succeed
submit_actions, count_as_attempt = submit(submit_actions)
# Everything was a success!
break if !submit_actions || submit_actions.empty?
if @max_flush_exceptions > 0 and count_as_attempt == true
attempts += 1
if attempts > @max_flush_exceptions
@logger.error("JDBC - max_flush_exceptions has been reached. #{submit_actions.length} events have been unable to be sent to SQL and are being dropped. See previously logged exceptions for details.")
break
end
end
# If we're retrying the action sleep for the recommended interval
# Double the interval for the next time through to achieve exponential backoff
Stud.stoppable_sleep(sleep_interval) { @stopping.true? }
sleep_interval = next_sleep_interval(sleep_interval)
end
end
def add_statement_event_params(statement, event)
@statement[1..-1].each_with_index do |i, idx|
if i.is_a? String
value = event.get(i)
if value.nil? and i =~ /%\{/
value = event.sprintf(i)
end
else
value = i
end
case value
when Time
# See LogStash::Timestamp, below, for the why behind strftime.
statement.setString(idx + 1, value.strftime(STRFTIME_FMT))
when LogStash::Timestamp
# XXX: Using setString as opposed to setTimestamp, because setTimestamp
# doesn't behave correctly in some drivers (Known: sqlite)
#
# Additionally this does not use `to_iso8601`, since some SQL databases
# choke on the 'T' in the string (Known: Derby).
#
# strftime appears to be the most reliable across drivers.
statement.setString(idx + 1, value.time.strftime(STRFTIME_FMT))
when Fixnum, Integer
if value > 2147483647 or value < -2147483648
statement.setLong(idx + 1, value)
else
statement.setInt(idx + 1, value)
end
when Float
statement.setFloat(idx + 1, value)
when String
statement.setString(idx + 1, value)
when Array, Hash
statement.setString(idx + 1, value.to_json)
when true, false
statement.setBoolean(idx + 1, value)
else
statement.setString(idx + 1, nil)
end
end
statement
end
def retry_exception?(exception)
retrying = (exception.respond_to? 'getSQLState' and (RETRYABLE_SQLSTATE_CLASSES.include?(exception.getSQLState.to_s[0,2]) or @retry_sql_states.include?(exception.getSQLState)))
log_jdbc_exception(exception, retrying)
retrying
end
def log_jdbc_exception(exception, retrying)
current_exception = exception
log_text = 'JDBC - Exception. ' + (retrying ? 'Retrying' : 'Not retrying') + '.'
log_method = (retrying ? 'warn' : 'error')
loop do
@logger.send(log_method, log_text, :exception => current_exception)
if current_exception.respond_to? 'getNextException'
current_exception = current_exception.getNextException()
else
current_exception = nil
end
break if current_exception == nil
end
end
def next_sleep_interval(current_interval)
doubled = current_interval * 2
doubled > @retry_max_interval ? @retry_max_interval : doubled
end
end # class LogStash::Outputs::jdbc