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Class: Mongo::Server::Description::Features

Relationships & Source Files
Inherits: Object
Defined in: lib/mongo/server/description/features.rb

Overview

Defines behavior around what features a specific server supports.

Since:

  • 2.0.0

Constant Summary

  • DRIVER_TOO_OLD =

    ::Mongo::Error message if the driver is too old for the version of the server.

    Since:

    • 2.5.0

    # File 'lib/mongo/server/description/features.rb', line 80 
    "Server at (%s) requires wire version (%s), but this version of the Ruby driver " +
"only supports up to (%s)."
  • DRIVER_WIRE_VERSIONS =

    The wire protocol versions that this version of the driver supports.

    Since:

    • 2.0.0

    # File 'lib/mongo/server/description/features.rb', line 86 
    (6..21).freeze
  • MAPPINGS =

    List of features and the wire protocol version they appear in.

    Wire protocol versions map to server releases as follows:

    • 2 => 2.6

    • 3 => 3.0

    • 4 => 3.2

    • 5 => 3.4

    • 6 => 3.6

    • 7 => 4.0

    • 8 => 4.2

    • 9 => 4.4

    • 13 => 5.0

    • 14 => 5.1

    • 17 => 6.0

    Since:

    • 2.0.0

    # File 'lib/mongo/server/description/features.rb', line 42 
    {
  merge_out_on_secondary: 13,
  get_more_comment: 9,
  retryable_write_error_label: 9,
  commit_quorum: 9,
  # Server versions older than 4.2 do not reliably validate options
  # provided by the client during findAndModify operations, requiring the
  # driver to raise client-side errors when those options are provided.
  find_and_modify_option_validation: 8,
  sharded_transactions: 8,
  transactions: 7,
  scram_sha_256: 7,
  array_filters: 6,
  op_msg: 6,
  sessions: 6,
  collation: 5,
  max_staleness: 5,
  # Server versions older than 3.4 do not reliably validate options
  # provided by the client during update/delete operations, requiring the
  # driver to raise client-side errors when those options are provided.
  update_delete_option_validation: 5,
  find_command: 4,
  list_collections: 3,
  list_indexes: 3,
  scram_sha_1: 3,
  write_command: 2,
  users_info: 2,
}.freeze
  • SERVER_TOO_OLD =

    ::Mongo::Error message if the server is too old for this version of the driver.

    Since:

    • 2.5.0

    # File 'lib/mongo/server/description/features.rb', line 74 
    "Server at (%s) reports wire version (%s), but this version of the Ruby driver " +
"requires at least (%s)."

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(server_wire_versions, address = nil) ⇒ Features

Initialize the features.

Examples:

Initialize the features.

Features.new(0..3)

Parameters:

  • server_wire_versions (Range) —

    The server supported wire versions.

Since:

  • 2.0.0

[ GitHub ] 

  


# File 'lib/mongo/server/description/features.rb', line 118



def initialize(server_wire_versions, address = nil)
  if server_wire_versions.min.nil?
    raise ArgumentError, "server_wire_versions's min is nil"
  end
  if server_wire_versions.max.nil?
    raise ArgumentError, "server_wire_versions's max is nil"
  end
  @server_wire_versions = server_wire_versions
  @address = address

  if Mongo::Lint.enabled?
    freeze
  end
end


  







Instance Attribute Details



  

    #server_wire_versions  ⇒ Range  (readonly)
  



  

    
  





  
Returns:


    
  
  • 
    (Range)
—    
    

    server_wire_versions The server’s supported wire versions.
    

    
  
    • 



Since:


    
  
  • 
    
    

    2.0.0
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/mongo/server/description/features.rb', line 107



attr_reader :server_wire_versions


  







Instance Method Details



  

    #check_driver_support!  
  



  

    

Check that there is an overlap between the driver supported wire



version range and the server wire version range.


  





    

    
Examples:

        


Verify the wire version overlap.



      
features.check_driver_support!

  


Raises:



Since:


    
  
  • 
    
    

    2.5.1
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/mongo/server/description/features.rb', line 143



def check_driver_support!
  if DRIVER_WIRE_VERSIONS.min > @server_wire_versions.max
    raise Error::UnsupportedFeatures.new(SERVER_TOO_OLD % [@address,
                                                           @server_wire_versions.max,
                                                           DRIVER_WIRE_VERSIONS.min])
  elsif DRIVER_WIRE_VERSIONS.max < @server_wire_versions.min
    raise Error::UnsupportedFeatures.new(DRIVER_TOO_OLD % [@address,
                                                           @server_wire_versions.min,
                                                           DRIVER_WIRE_VERSIONS.max])
  end
end