Permalink
Fetching contributors…
Cannot retrieve contributors at this time
353 lines (280 sloc) 11.9 KB
# encoding: utf-8
require 'logstash/outputs/base'
require 'logstash/namespace'
require 'concurrent'
require 'stud/interval'
require 'java'
require 'logstash-output-jdbc_jars'
require 'json'
require 'bigdecimal'
# 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: 5
# 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'
# Allows the whole event to be converted to JSON
config :enable_event_as_json_keyword, validate: :boolean, default: false
# The magic key used to convert the whole event to JSON. If you need this, and you have the default in your events, you can use this to change your magic keyword.
config :event_as_json_keyword, validate: :string, default: '@event'
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, nil)
# 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, event.to_json())
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 @enable_event_as_json_keyword == true and i.is_a? String and i == @event_as_json_keyword
value = event.to_json
elsif 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 BigDecimal
statement.setBigDecimal(idx + 1, value.to_java)
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, event)
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, event)
retrying
end
def log_jdbc_exception(exception, retrying, event)
current_exception = exception
log_text = 'JDBC - Exception. ' + (retrying ? 'Retrying' : 'Not retrying')
log_method = (retrying ? 'warn' : 'error')
loop do
# TODO reformat event output so that it only shows the fields necessary.
@logger.send(log_method, log_text, :exception => current_exception, :statement => @statement[0], :event => event)
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