Class: Myreplicator::MysqlExporter

Inherits:
Object
  • Object
show all
Defined in:
lib/exporter/mysql_exporter.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ MysqlExporter

Returns a new instance of MysqlExporter.



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# File 'lib/exporter/mysql_exporter.rb', line 4

def initialize *args
  options = args.extract_options!
end

Class Method Details

.compare_datatypes(index, vertica_schema, mysql_schema) ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 183

def self.compare_datatypes index, vertica_schema, mysql_schema
  type = Myreplicator::VerticaTypes.convert mysql_schema[index]["data_type"], mysql_schema[index]["column_type"]
  if vertica_schema.rows[index][:data_type].downcase != type.downcase
    if !(vertica_schema.rows[index][:data_type].include?("timestamp")) && 
      !(vertica_schema.rows[index][:data_type].include?("decimal")) && 
      !(vertica_schema.rows[index][:data_type].include?("numeric")) &&
      !(vertica_schema.rows[index][:data_type].include?("binary"))
      return true
    end
    return false
  end
  return false
end

.compare_schemas(vertica_schema, mysql_schema) ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 157

def self.compare_schemas vertica_schema, mysql_schema
  #Kernel.p vertica_schema
  #Kernel.p mysql_schema
  if vertica_schema.size != mysql_schema.size
    return true
  else
    index = 0
    while index < vertica_schema.size
      # check for column name
      if vertica_schema.rows[index][:column_name] != mysql_schema[index]["column_name"]
        puts "diff"
        return true
      end
  
      # check for column's data type
      if compare_datatypes index, vertica_schema, mysql_schema
        puts "diff #{index}"
        return true
      end
      # and others ?? (PRIMARY, DEFAULT NULL, etc.)
      index += 1
    end
  end
  return false      
end

.get_mysql_schema_rows(mysql_schema) ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 197

def self.get_mysql_schema_rows mysql_schema 
  mysql_schema_simple_form = []
  mysql_schema.each(:as => :hash) do |row|
    mysql_schema_simple_form << row
  end
  return mysql_schema_simple_form
end

.schema_changed?(options) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/exporter/mysql_exporter.rb', line 205

def self.schema_changed? options
  #Kernel.p "===== schema_changed? ====="
  #puts options
  mysql_schema = Loader.mysql_table_definition(options)
  vertica_schema = VerticaLoader.destination_table_vertica(options)

  # empty result set from vertica means table does not exist 
  unless vertica_schema.size > 0 
    return {:changed => true, :mysql_schema => mysql_schema, :new => true}
  end
  # compare two schemas
  
  
  mysql_schema_2 = get_mysql_schema_rows mysql_schema
  if compare_schemas(vertica_schema, mysql_schema_2)
    result =  {:changed => true, :mysql_schema => mysql_schema, :vertica_schema => vertica_schema,:new => false}
  else
    result =  {:changed => false, :mysql_schema => mysql_schema}
  end
  #Kernel.p result
  return result
end

Instance Method Details

#check_result(result, size) ⇒ Object

Checks the returned resut from SSH CMD Size specifies if there should be any returned results or not



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# File 'lib/exporter/mysql_exporter.rb', line 232

def check_result result, size
  unless result.nil?
    raise Exceptions::ExportError.new("Export Error\n#{result}") if result.length > 0
  end     
end

#execute_export(cmd, metadata) ⇒ Object

Executes export command via ssh on the source DB Updates/interacts with the metadata object



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# File 'lib/exporter/mysql_exporter.rb', line 242

def execute_export cmd, metadata
  metadata.store!
  result = ""

  # Execute Export command on the source DB server
  result = metadata.ssh.exec!(cmd)
  
  return result
end

#export_table(export_obj) ⇒ Object

Gets an Export object and dumps the data Initially using mysqldump Incrementally using mysql -e afterwards



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# File 'lib/exporter/mysql_exporter.rb', line 13

def export_table export_obj
  @export_obj = export_obj

  ExportMetadata.record(:table => @export_obj.table_name,
                        :database => @export_obj.source_schema,
                        :export_to => load_to,
                        :export_id => @export_obj.id,
                        :filepath => filepath,
                        :store_in => @export_obj.s3_path,
                        :incremental_col => @export_obj.incremental_column) do |metadata|

    prepare metadata

    if @export_obj.export_type? == :new && load_to == "mysql"
      on_failure_state_trans(metadata, "new") # If failed, go back to new
      on_export_success(metadata)
      initial_export metadata
    elsif @export_obj.export_type? == :incremental || load_to == "vertica"
      on_failure_state_trans(metadata, "failed") # Set state trans on failure
      on_export_success(metadata)
      incremental_export_into_outfile metadata
    end
    
  end # metadata
end

#exporting_state_trans ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 280

def exporting_state_trans
  update_export(:state => "exporting", 
                :export_started_at => Time.now, 
                :exporter_pid => Process.pid)
end

#filepath ⇒ Object

File path on remote server



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# File 'lib/exporter/mysql_exporter.rb', line 63

def filepath
  File.join(Myreplicator.configs[@export_obj.source_schema]["ssh_tmp_dir"], @export_obj.filename)
end

#incremental_export_into_outfile(metadata) ⇒ Object

Exports table incrementally, similar to incremental_export method Dumps file in tmp directory specified in myreplicator.yml Note that directory needs 777 permissions for mysql to be able to export the file Uses \0 as the delimiter and new line for lines



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# File 'lib/exporter/mysql_exporter.rb', line 110

def incremental_export_into_outfile metadata
  unless @export_obj.is_running?
    
    if @export_obj.export_type == "incremental"
      max_value = @export_obj.max_value
      metadata.export_type = "incremental"        
      @export_obj.update_max_val if @export_obj.max_incremental_value.blank?   
    end

    options = {
      :db => @export_obj.source_schema,
      :source_schema => @export_obj.source_schema,
      :table => @export_obj.table_name,
      :filepath => filepath,
      :destination_schema => @export_obj.destination_schema,
      :enclosed_by => Myreplicator.configs[@export_obj.source_schema]["enclosed_by"]}

    schema_status = Myreplicator::MysqlExporter.schema_changed?(options)
    Kernel.p "===== schema_status ====="
    Kernel.p schema_status
    if schema_status[:changed] # && new?
      metadata.export_type = "initial"
    else
      options[:incremental_col] = @export_obj.incremental_column
      options[:incremental_col_type] = @export_obj.incremental_column_type
      #options[:incremental_val] = @export_obj.max_incremental_value
      options[:export_type] = @export_obj.export_type
      options[:incremental_val] = [@export_obj.destination_max_incremental_value, @export_obj.max_incremental_value].min
    end

    #Kernel.p "===== incremental_export_into_outfile OPTIONS ====="
    #Kernel.p options
    cmd = SqlCommands.mysql_export_outfile(options)      
    exporting_state_trans
    puts "Exporting..."
    result = execute_export(cmd, metadata)
    check_result(result, 0)

    if @export_obj.export_type == "incremental"
      metadata.incremental_val = max_value # store max val in metadata
      @export_obj.update_max_val(max_value) # update max value if export was successful
    end
  end

  return false
end

#initial_export(metadata) ⇒ Object

Exports Table using mysqldump. This method is invoked only once. Dumps with create options, no need to create table manaully



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# File 'lib/exporter/mysql_exporter.rb', line 72

def initial_export metadata
  metadata.export_type = "initial"
  max_value = @export_obj.max_value if @export_obj.incremental_export?
  cmd = initial_mysqldump_cmd
  exporting_state_trans # mark exporting

  puts "Exporting..."
  result = execute_export(cmd, metadata)
  check_result(result, 0)

  @export_obj.update_max_val(max_value) if @export_obj.incremental_export?
end

#initial_mysqldump_cmd ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 85

def initial_mysqldump_cmd
  flags = ["create-options", "single-transaction"]       
  cmd = ""
  # Mysql - Mysql Export
  if @export_obj.export_to == "destination_db"
    cmd = SqlCommands.mysqldump(:db => @export_obj.source_schema,
                                :flags => flags,
                                :filepath => filepath,
                                :table_name => @export_obj.table_name)     
  else # Other destinations
    cmd = SqlCommands.mysql_export_outfile(:db => @export_obj.source_schema,
                                           :filepath => filepath,
                                           :table => @export_obj.table_name)
  end
  
  return cmd
end

#load_to ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 39

def load_to
  if @export_obj.export_to == "vertica"
    return "vertica"
  else
    return "mysql"
  end
end

#on_export_success(metadata) ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 286

def on_export_success metadata
  metadata.on_success do |m|
    zipfile(metadata)
    update_export(:state => "export_completed", 
                  :export_finished_at => Time.now, 
                  :error => metadata.error)
    metadata.state = "export_completed"
  end
end

#on_failure_state_trans(metadata, state) ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 271

def on_failure_state_trans metadata, state
  metadata.on_failure do |m|
    update_export(:state => state, 
                  :export_finished_at => Time.now, 
                  :error => metadata.error)
    raise Exceptions::ExportError.new(metadata.error)
  end
end

#prepare(metadata) ⇒ Object

Setups SSH connection to remote host



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# File 'lib/exporter/mysql_exporter.rb', line 50

def prepare metadata
  ssh = @export_obj.ssh_to_source
  metadata.ssh = ssh
end

#update_export(*args) ⇒ Object 



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# File 'lib/exporter/mysql_exporter.rb', line 55

def update_export *args
  options = args.extract_options!
  @export_obj.update_attributes! options
end

#zipfile(metadata) ⇒ Object

zips the file on the source DB server



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# File 'lib/exporter/mysql_exporter.rb', line 255

def zipfile metadata
  cmd = "cd #{Myreplicator.configs[@export_obj.source_schema]["ssh_tmp_dir"]}; gzip #{@export_obj.filename}"

  puts cmd

  zip_result = metadata.ssh.exec!(cmd)

  unless zip_result.nil?        
    raise Exceptions::ExportError.new("Export Error\n#{zip_result}") if zip_result.length > 0
  end

  metadata.zipped = true

  return zip_result
end