Class: Taps::ClientSession

Inherits:
Object
  • Object
show all
Defined in:
lib/taps/client_session.rb

Defined Under Namespace

Classes: CorruptedData

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(database_url, remote_url, default_chunksize) ⇒ ClientSession

Returns a new instance of ClientSession.



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# File 'lib/taps/client_session.rb', line 14

def initialize(database_url, remote_url, default_chunksize)
  @database_url = database_url
  @remote_url = remote_url
  @default_chunksize = default_chunksize
end

Instance Attribute Details

#database_url ⇒ Object (readonly)

Returns the value of attribute database_url.



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# File 'lib/taps/client_session.rb', line 12

def database_url
  @database_url
end

#default_chunksize ⇒ Object (readonly)

Returns the value of attribute default_chunksize.



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# File 'lib/taps/client_session.rb', line 12

def default_chunksize
  @default_chunksize
end

#remote_url ⇒ Object (readonly)

Returns the value of attribute remote_url.



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# File 'lib/taps/client_session.rb', line 12

def remote_url
  @remote_url
end

Class Method Details

.quickstart(&block) ⇒ Object 



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# File 'lib/taps/client_session.rb', line 26

def self.quickstart(&block)
  start(Taps::Config.database_url, Taps::Config.remote_url, Taps::Config.chunksize) do |s|
    yield s
  end
end

.start(database_url, remote_url, default_chunksize) {|s| ... } ⇒ Object

Yields:

  • (s) 


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# File 'lib/taps/client_session.rb', line 20

def self.start(database_url, remote_url, default_chunksize, &block)
  s = new(database_url, remote_url, default_chunksize)
  yield s
  s.close_session
end

Instance Method Details

#close_session ⇒ Object 



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# File 'lib/taps/client_session.rb', line 53

def close_session
  @session_resource.delete(http_headers) if @session_resource
end

#cmd_receive ⇒ Object 



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# File 'lib/taps/client_session.rb', line 173

def cmd_receive
  begin
    verify_server
    cmd_receive_schema
    cmd_receive_data
    cmd_receive_indexes
    cmd_reset_sequences
  rescue RestClient::Exception => e
    if e.respond_to?(:response)
      puts "!!! Caught Server Exception"
      puts "#{e.response.body}"
      exit(1)
    else
      raise
    end
  end
end

#cmd_receive_data ⇒ Object 



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# File 'lib/taps/client_session.rb', line 191

def cmd_receive_data
  puts "Receiving data"

  tables_with_counts, record_count = fetch_remote_tables_info

  puts "#{tables_with_counts.size} tables, #{format_number(record_count)} records"

  tables_with_counts.each do |table_name, count|
    table = db[table_name.to_sym]
    chunksize = default_chunksize

    progress = ProgressBar.new(table_name.to_s, count)

    offset = 0
    loop do
      begin
        chunksize, rows = fetch_table_rows(table_name, chunksize, offset)
      rescue CorruptedData
        next
      end
      break if rows == { }

      table.import(rows[:header], rows[:data])

      progress.inc(rows[:data].size)
      offset += rows[:data].size
    end

    progress.finish
  end
end

#cmd_receive_indexes ⇒ Object 



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# File 'lib/taps/client_session.rb', line 266

def cmd_receive_indexes
  puts "Receiving indexes"

  index_data = session_resource['indexes'].get(http_headers)

  output = Taps::Schema.load_indexes(database_url, index_data)
  puts output if output
end

#cmd_receive_schema ⇒ Object 



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# File 'lib/taps/client_session.rb', line 258

def cmd_receive_schema
  puts "Receiving schema"

  schema_data = session_resource['schema'].get(http_headers)
  output = Taps::Schema.load(database_url, schema_data)
  puts output if output
end

#cmd_reset_sequences ⇒ Object 



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# File 'lib/taps/client_session.rb', line 275

def cmd_reset_sequences
  puts "Resetting sequences"

  output = Taps::Schema.reset_db_sequences(database_url)
  puts output if output
end

#cmd_send ⇒ Object 



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# File 'lib/taps/client_session.rb', line 73

def cmd_send
  begin
    verify_server
    cmd_send_schema
    cmd_send_data
    cmd_send_indexes
    cmd_send_reset_sequences
  rescue RestClient::Exception => e
    if e.respond_to?(:response)
      puts "!!! Caught Server Exception"
      puts "#{e.response.body}"
      exit(1)
    else
      raise
    end
  end
end

#cmd_send_data ⇒ Object 



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# File 'lib/taps/client_session.rb', line 111

def cmd_send_data
  puts "Sending data"

  tables_with_counts, record_count = fetch_tables_info

  puts "#{tables_with_counts.size} tables, #{format_number(record_count)} records"


  db.tables.each do |table_name|
    table = db[table_name]
    count = table.count
    order = Taps::Utils.order_by(db, table_name)
    chunksize = self.default_chunksize
    string_columns = Taps::Utils.incorrect_blobs(db, table_name)

    progress = ProgressBar.new(table_name.to_s, count)

    offset = 0
    loop do
      row_size = 0
      chunksize = Taps::Utils.calculate_chunksize(chunksize) do |c|
        rows = Taps::Utils.format_data(table.order(*order).limit(c, offset).all, string_columns)
        break if rows == { }

        row_size = rows[:data].size
        gzip_data = Taps::Utils.gzip(Marshal.dump(rows))

        begin
          session_resource["tables/#{table_name}"].post(gzip_data, http_headers({
            :content_type => 'application/octet-stream',
            :taps_checksum => Taps::Utils.checksum(gzip_data).to_s}))
        rescue RestClient::RequestFailed => e
          # retry the same data, it got corrupted somehow.
          if e.http_code == 412
            next
          end
          raise
        end
      end

      progress.inc(row_size)
      offset += row_size

      break if row_size == 0
    end

    progress.finish
  end
end

#cmd_send_indexes ⇒ Object 



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# File 'lib/taps/client_session.rb', line 91

def cmd_send_indexes
  puts "Sending indexes"

  index_data = Taps::Schema.indexes(database_url)
  session_resource['indexes'].post(index_data, http_headers)
end

#cmd_send_reset_sequences ⇒ Object 



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# File 'lib/taps/client_session.rb', line 105

def cmd_send_reset_sequences
  puts "Resetting sequences"

  session_resource["reset_sequences"].post('', http_headers)
end

#cmd_send_schema ⇒ Object 



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# File 'lib/taps/client_session.rb', line 98

def cmd_send_schema
  puts "Sending schema"

  schema_data = Taps::Schema.dump_without_indexes(database_url)
  session_resource['schema'].post(schema_data, http_headers)
end

#db ⇒ Object 



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# File 'lib/taps/client_session.rb', line 32

def db
  @db ||= Sequel.connect(database_url)
end

#fetch_remote_tables_info ⇒ Object 



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# File 'lib/taps/client_session.rb', line 242

def fetch_remote_tables_info
  retries = 0
  max_retries = 1
  begin
    tables_with_counts = Marshal.load(session_resource['tables'].get(http_headers))
    record_count = tables_with_counts.values.inject(0) { |a,c| a += c }
  rescue RestClient::Exception
    retries += 1
    retry if retries <= max_retries
    puts "Unable to fetch tables information from #{remote_url}. Please check the server log."
    exit(1)
  end

  [ tables_with_counts, record_count ]
end

#fetch_table_rows(table_name, chunksize, offset) ⇒ Object

Raises:



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# File 'lib/taps/client_session.rb', line 225

def fetch_table_rows(table_name, chunksize, offset)
  response = nil
  chunksize = Taps::Utils.calculate_chunksize(chunksize) do |c|
    response = session_resource["tables/#{table_name}/#{c}?offset=#{offset}"].get(http_headers)
  end
  raise CorruptedData unless Taps::Utils.valid_data?(response.to_s, response.headers[:taps_checksum])

  begin
    rows = Marshal.load(Taps::Utils.gunzip(response.to_s))
  rescue Object => e
    puts "Error encountered loading data, wrote the data chunk to dump.#{Process.pid}.gz"
    File.open("dump.#{Process.pid}.gz", "w") { |f| f.write(response.to_s) }
    raise
  end
  [chunksize, rows]
end

#fetch_tables_info ⇒ Object 



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# File 'lib/taps/client_session.rb', line 161

def fetch_tables_info
  record_count = 0
  tables = db.tables
  tables_with_counts = tables.inject({}) do |accum, table|
    accum[table] = db[table].count
    record_count += accum[table]
    accum
  end

  [ tables_with_counts, record_count ]
end

#format_number(num) ⇒ Object 



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# File 'lib/taps/client_session.rb', line 282

def format_number(num)
  num.to_s.gsub(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1,")
end

#http_headers(extra = {}) ⇒ Object 



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# File 'lib/taps/client_session.rb', line 69

def http_headers(extra = {})
  { :taps_version => Taps.compatible_version }.merge(extra)
end

#open_session ⇒ Object 



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# File 'lib/taps/client_session.rb', line 44

def open_session
  uri = server['sessions'].post('', http_headers)
  server[uri]
end

#safe_database_url ⇒ Object 



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# File 'lib/taps/client_session.rb', line 65

def safe_database_url
  safe_url(database_url)
end

#safe_remote_url ⇒ Object 



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# File 'lib/taps/client_session.rb', line 61

def safe_remote_url
  safe_url(remote_url)
end

#safe_url(url) ⇒ Object 



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# File 'lib/taps/client_session.rb', line 57

def safe_url(url)
  url.sub(/\/\/(.+?)?:(.*?)@/, '//\1:[hidden]@')
end

#server ⇒ Object 



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# File 'lib/taps/client_session.rb', line 36

def server
  @server ||= RestClient::Resource.new(remote_url)
end

#session_resource ⇒ Object 



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# File 'lib/taps/client_session.rb', line 40

def session_resource
  @session_resource ||= open_session
end

#set_session(uri) ⇒ Object 



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# File 'lib/taps/client_session.rb', line 49

def set_session(uri)
  @session_resource = server[uri]
end

#verify_server ⇒ Object 



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# File 'lib/taps/client_session.rb', line 286

def verify_server
  begin
    server['/'].get(http_headers)
  rescue RestClient::RequestFailed => e
    if e.http_code == 417
      puts "#{safe_remote_url} is running a different minor version of taps."
      puts "#{e.response.body}"
      exit(1)
    else
      raise
    end
  rescue RestClient::Unauthorized
    puts "Bad credentials given for #{safe_remote_url}"
    exit(1)
  rescue Errno::ECONNREFUSED
    puts "Can't connect to #{safe_remote_url}. Please check that it's running"
    exit(1)
  end
end