Class: Fluent::Plugin::MysqlReplicatorMultiInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_mysql_replicator_multi.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MysqlReplicatorMultiInput

Returns a new instance of MysqlReplicatorMultiInput.



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 9

def initialize
  require 'mysql2'
  require 'digest/sha1'
  require 'json'
  super
end

Instance Method Details

#add_hash_table_buffer(setting_name, id, hash) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 234

def add_hash_table_buffer(setting_name, id, hash)
  @hash_table_bulk_insert << "('#{setting_name}','#{id}','#{hash}')"
  flush_hash_table if @hash_table_bulk_insert.size >= @bulk_insert_count
end

#collect_gap_ids(config, current_id, previous_id) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 188

def collect_gap_ids(config, current_id, previous_id)
  setting_name = config['name']
  if (current_id - previous_id) > 1 && config['enable_loose_delete'] == 0
    query = "SELECT SQL_NO_CACHE setting_query_pk FROM hash_tables
      WHERE setting_name = '#{setting_name}'
      AND setting_query_pk > #{previous_id.to_i} AND setting_query_pk < #{current_id.to_i}"
  elsif (current_id - previous_id) > 1 && config['enable_loose_delete'] == 1
    return [*previous_id...current_id] - [current_id,previous_id]
  elsif previous_id > current_id
    query = "SELECT SQL_NO_CACHE setting_query_pk FROM hash_tables
      WHERE setting_name = '#{setting_name}'
      AND setting_query_pk > #{previous_id.to_i}"
  elsif previous_id == current_id
    query = "SELECT SQL_NO_CACHE setting_query_pk FROM hash_tables
      WHERE setting_name = '#{setting_name}'
      AND (setting_query_pk > #{current_id.to_i} OR setting_query_pk < #{current_id.to_i})"
  end
  ids = Array.new
  unless query.nil?
    @manager_db.query(query).each do |row|
      ids << row['setting_query_pk']
    end
  end
  return ids
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 26

def configure(conf)
  super
  if @tag.nil?
    raise Fluent::ConfigError, "mysql_replicator_multi: missing 'tag' parameter. Please add following line into config like 'tag replicator.${name}.${event}.${primary_key}'"
  end
end

#detect_delete(config, current_id, previous_id) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 175

def detect_delete(config, current_id, previous_id)
  return if config['enable_delete'] != 1 || previous_id.nil?
  deleted_ids = collect_gap_ids(config, current_id, previous_id)
  unless deleted_ids.empty?
    event = :delete
    deleted_ids.each do |id|
      tag = format_tag(@tag, {:name => config['name'], :event => event, :primary_key => config['primary_key']})
      emit_record(tag, {config['primary_key'] => id})
    end
    update_hashtable({:event =>  event, :ids => deleted_ids, :setting_name => config['name']})
  end
end

#detect_insert_update(config, row) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 150

def detect_insert_update(config, row)
  primary_key = config['primary_key']
  current_id = row[primary_key]
  stored_hash = config['enable_loose_insert'] == 1 ? "" : get_stored_hash(config['name'], current_id)
  current_hash = Digest::SHA1.hexdigest(row.flatten.join)

  event = nil
  if stored_hash.empty?
    event = :insert
  elsif stored_hash != current_hash
    event = :update
  end
  unless event.nil?
    tag = format_tag(@tag, {:name => config['name'], :event => event, :primary_key => config['primary_key']})
    emit_record(tag, row)
    update_hashtable({:event => event, :id => current_id, :setting_name => config['name'], :hash => current_hash})
  end
end

#emit_record(tag, record) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 288

def emit_record(tag, record)
  router.emit(tag, Fluent::Engine.now, record)
end

#flush_hash_table ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 262

def flush_hash_table
  return if @hash_table_bulk_insert.empty?
  query = "INSERT INTO hash_tables (setting_name,setting_query_pk,setting_query_hash)
    VALUES #{@hash_table_bulk_insert.join(',')}
    ON DUPLICATE KEY UPDATE setting_query_hash = VALUES(setting_query_hash)"
  @manager_db.query(query)
  @hash_table_bulk_insert.clear
  @hash_table_bulk_insert_last_time = Time.now
end

#format_tag(tag, param) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 226

def format_tag(tag, param)
  pattern = {'${name}' => param[:name], '${event}' => param[:event].to_s, '${primary_key}' => param[:primary_key]}
  tag.gsub(/(\${[a-z_]+})/) do
    log.warn "mysql_replicator_multi: unknown placeholder found. :tag=>#{tag} :placeholder=>#{$1}" unless pattern.include?($1)
    pattern[$1]
  end
end

#get_manager_connection ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 292

def get_manager_connection
  begin
    return Mysql2::Client.new(
      :host => @manager_host,
      :port => @manager_port,
      :username => @manager_username,
      :password => @manager_password,
      :database => @manager_database,
      :encoding => 'utf8',
      :reconnect => true,
      :stream => false,
      :cache_rows => false
    )
  rescue Mysql2::Error => e
    raise "mysql_replicator_multi: #{e}"
  end
end

#get_origin_connection(config) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 310

def get_origin_connection(config)
  begin
    return Mysql2::Client.new(
      :host => config['host'],
      :port => config['port'],
      :username => config['username'],
      :password => config['password'],
      :database => config['database'],
      :encoding => 'utf8',
      :reconnect => true,
      :stream => true,
      :cache_rows => false
    )
  rescue Mysql2::Error => e
    if config['enable_retry'] == 1
      raise e
    else
      raise "mysql_replicator_multi: #{e}"
    end
  end
end

#get_settings ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 68

def get_settings
  manager_db = get_manager_connection
  settings = []
  query = "SELECT * FROM settings WHERE is_active = 1;"
  manager_db.query(query).each do |row|
    settings << row
  end
  return settings
end

#get_stored_hash(setting_name, id) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 169

def get_stored_hash(setting_name, id)
  query = "SELECT SQL_NO_CACHE setting_query_hash FROM hash_tables WHERE setting_query_pk = #{id.to_i} AND setting_name = '#{setting_name}'"
  row = @manager_db.query(query).first
  return row.nil? ? "" : row['setting_query_hash']
end

#hash_table_flusher ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 239

def hash_table_flusher
  begin
    while @running
      if @hash_table_bulk_insert.empty? || @bulk_insert_timeout > (Time.now - @hash_table_bulk_insert_last_time)
        sleep @bulk_insert_timeout
        next
      end
      @mutex.synchronize {
        flush_hash_table
      }
    end
    @mutex.synchronize {
      flush_hash_table
    }
  rescue StandardError => e
    @mutex.synchronize {
      log.error "mysql_replicator_multi: failed to flush buffered query. :config=>#{masked_config}"
      log.error "error: #{e.message}"
      log.error e.backtrace.join("\n")
    }
  end
end

#parse_json_columns!(row, columns) ⇒ Object

Parse the given columns’ JSON string values into nested objects in place. Non-string values, missing columns, and malformed JSON are left untouched so enabling this never corrupts non-JSON data.



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 275

def parse_json_columns!(row, columns)
  return if columns.empty?
  columns.each do |col|
    v = row[col]
    next unless v.is_a?(String)
    begin
      row[col] = JSON.parse(v)
    rescue JSON::ParserError
      # leave the original string as-is on malformed JSON
    end
  end
end

#poll(config) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 78

def poll(config)
  begin
    masked_config = Hash[config.map {|k,v| (k == 'password') ? [k, v.to_s.gsub(/./, '*')] : [k,v]}]
    @mutex.synchronize {
      log.info "mysql_replicator_multi: polling start. :config=>#{masked_config}"
    }
    primary_key = config['primary_key']
    json_columns = (config['json_columns'] || '').split(',').map(&:strip).reject(&:empty?)
    previous_id = current_id = nil
    while @running
      rows_count = 0
      start_time = Time.now
      db = nil
      nest_db = nil
      begin
        unless config['prepared_query'].nil?
          nest_db = get_origin_connection(config)
          config['prepared_query'].strip.split(/;/).each do |query|
            nest_db.query(query)
          end
        end
        db = get_origin_connection(config)
        db.query(config['query']).each do |row|
          row.each {|k, v| row[k] = v.to_s if v.is_a?(Time) || v.is_a?(Date) || v.is_a?(BigDecimal)}
          parse_json_columns!(row, json_columns)
          row.select {|k, v| v.to_s.strip.match(/^SELECT[^\$]+\$\{[^\}]+\}/i) }.each do |k, v|
            row[k] = [] unless row[k].is_a?(Array)
            nest_db.query(v.gsub(/\$\{([^\}]+)\}/) {|matched| row[$1].to_s}).each do |nest_row|
              nest_row.each {|k, v| nest_row[k] = v.to_s if v.is_a?(Time) || v.is_a?(Date) || v.is_a?(BigDecimal)}
              row[k] << nest_row
            end
          end
          current_id = row[primary_key]
          @mutex.synchronize {
            if row[primary_key].nil?
              log.error "mysql_replicator_multi: missing primary_key. :setting_name=>#{config['name']} :primary_key=>#{primary_key}"
              break
            end
            detect_insert_update(config, row)
            detect_delete(config, current_id, previous_id)
          }
          previous_id = current_id
          rows_count += 1
        end
      rescue Mysql2::Error => e
        raise e unless config['enable_retry'] == 1

        @mutex.synchronize {
          log.error "mysql_replicator_multi: failed due to an error caused by the database. :setting_name=>#{config['name']}"
          log.error "error: #{e.message}"
          log.error e.backtrace.join("\n")
        }
        sleep config['retry_interval']
      ensure
        db.close if db
        nest_db.close if nest_db && !config['prepared_query'].nil?
      end
      elapsed_time = sprintf("%0.02f", Time.now - start_time)
      @mutex.synchronize {
        log.info "mysql_replicator_multi: execution finished. :setting_name=>#{config['name']} :rows_count=>#{rows_count} :elapsed_time=>#{elapsed_time} sec"
      }
      sleep config['interval']
    end
  rescue StandardError => e
    @mutex.synchronize {
      log.error "mysql_replicator_multi: failed to execute query. :config=>#{masked_config}"
      log.error "error: #{e.message}"
      log.error e.backtrace.join("\n")
    }
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 63

def shutdown
  @threads.each(&:join)
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 33

def start
  super
  begin
    @threads = []
    @mutex = Mutex.new
    @manager_db = get_manager_connection
    @manager_db.query("SET SESSION wait_timeout=1800;")
    @running = true
    @threads << thread_create(:in_mysql_replicator_flusher) {
      @hash_table_bulk_insert = []
      @hash_table_bulk_insert_last_time = Time.now
      hash_table_flusher
    }
    get_settings.each_with_index do |config, idx|
      @threads << thread_create(:"in_mysql_replicator_pollers_#{idx}") {
        poll(config)
      }
    end
    log.error "mysql_replicator_multi: stop working due to empty configuration" if @threads.empty?
  rescue StandardError => e
    log.error "error: #{e.message}"
    log.error e.backtrace.join("\n")
  end
end

#stop ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 58

def stop
  @running = false
  super
end

#update_hashtable(opts) ⇒ Object 



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# File 'lib/fluent/plugin/in_mysql_replicator_multi.rb', line 214

def update_hashtable(opts)
  case opts[:event]
  when :insert
    add_hash_table_buffer(opts[:setting_name], opts[:id], opts[:hash])
  when :update
    query = "UPDATE hash_tables SET setting_query_hash = '#{opts[:hash]}' WHERE setting_name = '#{opts[:setting_name]}' AND setting_query_pk = '#{opts[:id]}'"
  when :delete
    query = "DELETE FROM hash_tables WHERE setting_name = '#{opts[:setting_name]}' AND setting_query_pk IN(#{opts[:ids].join(',')})"
  end
  @manager_db.query(query) unless query.nil?
end