Class: Moped::Node Private

Inherits:
Object show all
Defined in:
lib/moped/node.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Represents a client to a node in a server cluster.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(address) ⇒ Node

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Creat the new node.

Examples:

Create the new node.

Node.new("127.0.0.1:27017")

Parameters:

  • address (String) —

    The location of the server node.

Since:

  • 1.0.0



210
211
212
213
214
215
216
217
218
219
220
221
222
223
 
# File 'lib/moped/node.rb', line 210

def initialize(address)
  @address = address

  host, port = address.split(":")
  @ip_address = ::Socket.getaddrinfo(host, nil, ::Socket::AF_INET, ::Socket::SOCK_STREAM).first[3]
  @port = port.to_i
  @resolved_address = "#{@ip_address}:#{@port}"

  @timeout = 5
  @down_at = nil
  @refreshed_at = nil
  @primary = nil
  @secondary = nil
end

Instance Attribute Details

#address ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



15
16
17
 
# File 'lib/moped/node.rb', line 15

def address
  @address
end

#address The address of the node.(Theaddressofthenode.) ⇒ Object (readonly) 



15
 
# File 'lib/moped/node.rb', line 15

attr_reader :address, :down_at, :ip_address, :peers, :port, :resolved_address, :timeout

#down_at ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



15
16
17
 
# File 'lib/moped/node.rb', line 15

def down_at
  @down_at
end

#down_at The time the server node went down.(Thetimetheservernodewentdown.) ⇒ Object (readonly) 



15
 
# File 'lib/moped/node.rb', line 15

attr_reader :address, :down_at, :ip_address, :peers, :port, :resolved_address, :timeout

#ip_address ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



15
16
17
 
# File 'lib/moped/node.rb', line 15

def ip_address
  @ip_address
end

#ip_address The node's ip.(Thenode's ip.) ⇒ Object (readonly) 



15
 
# File 'lib/moped/node.rb', line 15

attr_reader :address, :down_at, :ip_address, :peers, :port, :resolved_address, :timeout

#peers ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



15
16
17
 
# File 'lib/moped/node.rb', line 15

def peers
  @peers
end

#peers Other peers in the replica set.(Otherpeers) ⇒ Object (readonly) 



15
 
# File 'lib/moped/node.rb', line 15

attr_reader :address, :down_at, :ip_address, :peers, :port, :resolved_address, :timeout

#port ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



15
16
17
 
# File 'lib/moped/node.rb', line 15

def port
  @port
end

#port The connection port.(Theconnectionport.) ⇒ Object (readonly) 



15
 
# File 'lib/moped/node.rb', line 15

attr_reader :address, :down_at, :ip_address, :peers, :port, :resolved_address, :timeout

#resolved_address ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



15
16
17
 
# File 'lib/moped/node.rb', line 15

def resolved_address
  @resolved_address
end

#resolved_address The host/port pair.(Thehost/portpair.) ⇒ Object (readonly) 



15
 
# File 'lib/moped/node.rb', line 15

attr_reader :address, :down_at, :ip_address, :peers, :port, :resolved_address, :timeout

#timeout ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



15
16
17
 
# File 'lib/moped/node.rb', line 15

def timeout
  @timeout
end

#timeout The connection timeout.(Theconnectiontimeout.) ⇒ Object (readonly) 



15
 
# File 'lib/moped/node.rb', line 15

attr_reader :address, :down_at, :ip_address, :peers, :port, :resolved_address, :timeout

Instance Method Details

#==(other) ⇒ true, false Also known as: eql?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Is this node equal to another?

Examples:

Is the node equal to another.

node == other

Parameters:

  • other (Node) —

    The other node.

Returns:

  • (true, false) —

    If the addresses are equal.

Since:

  • 1.0.0



27
28
29
 
# File 'lib/moped/node.rb', line 27

def ==(other)
  resolved_address == other.resolved_address
end

#apply_auth(credentials) ⇒ Node

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Apply the authentication details to this node.

Examples:

Apply authentication.

node.apply_auth([ :db, "user", "pass" ])

Parameters:

  • credentials (Array<String>) —

    The db, username, and password.

Returns:

  • (Node) —

    The authenticated node.

Since:

  • 1.0.0



42
43
44
45
46
47
48
49
50
51
 
# File 'lib/moped/node.rb', line 42

def apply_auth(credentials)
  unless auth == credentials
    logouts = auth.keys - credentials.keys
    logouts.each { |database| logout(database) }
    credentials.each do |database, (username, password)|
      (database, username, password) unless auth[database] == [username, password]
    end
  end
  self
end

#arbiter? ⇒ true, false

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Is the node an arbiter?

Examples:

Is the node an arbiter?

node.arbiter?

Returns:

  • (true, false) —

    If the node is an arbiter.

Since:

  • 1.0.0



309
310
311
 
# File 'lib/moped/node.rb', line 309

def arbiter?
  @arbiter
end

#command(database, cmd, options = {}) ⇒ Hash

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Execute a command against a database.

Examples:

Execute a command.

node.command(database, { ping: 1 })

Parameters:

  • database (Database) —

    The database to run the command on.

  • cmd (Hash) —

    The command to execute.

Returns:

  • (Hash) —

    The result of the command.

Raises:

  • (OperationFailure) —

    If the command failed.

Since:

  • 1.0.0



67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/moped/node.rb', line 67

def command(database, cmd, options = {})
  operation = Protocol::Command.new(database, cmd, options)

  process(operation) do |reply|
    result = reply.documents[0]
    raise Errors::OperationFailure.new(
      operation, result
    ) if result["ok"] != 1 || result["err"] || result["errmsg"]
    result
  end
end

#disconnect ⇒ nil

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Force the node to disconnect from the server.

Returns:

  • (nil) —

    nil.

Since:

  • 1.2.0



84
85
86
87
 
# File 'lib/moped/node.rb', line 84

def disconnect
  auth.clear
  connection.disconnect
end

#down? ⇒ Time?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Is the node down?

Examples:

Is the node down?

node.down?

Returns:

  • (Time, nil) —

    The time the node went down, or nil if up.

Since:

  • 1.0.0



97
98
99
 
# File 'lib/moped/node.rb', line 97

def down?
  @down_at
end

#ensure_connected ⇒ nil

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Yields the block if a connection can be established, retrying when a connection error is raised.

Examples:

Ensure we are connection.

node.ensure_connected do
  #...
end

Returns:

  • (nil) —

    nil.

Since:

  • 1.0.0



114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
 
# File 'lib/moped/node.rb', line 114

def ensure_connected
  # Don't run the reconnection login if we're already inside an
  # +ensure_connected+ block.
  return yield if Threaded.executing?(:connection)
  Threaded.begin(:connection)
  retry_on_failure = true

  begin
    connect unless connected?
    yield
  rescue Errors::ReplicaSetReconfigured
    # Someone else wrapped this in an #ensure_primary block, so let the
    # reconfiguration exception bubble up.
    raise
  rescue Errors::OperationFailure, Errors::AuthenticationFailure, Errors::QueryFailure
    # These exceptions are "expected" in the normal course of events, and
    # don't necessitate disconnecting.
    raise
  rescue Errors::ConnectionFailure
    disconnect

    if retry_on_failure
      # Maybe there was a hiccup -- try reconnecting one more time
      retry_on_failure = false
      retry
    else
      # Nope, we failed to connect twice. Flag the node as down and re-raise
      # the exception.
      down!
      raise
    end
  rescue
    # Looks like we got an unexpected error, so we'll clean up the connection
    # and re-raise the exception.
    disconnect
    raise $!.extend(Errors::SocketError)
  end
ensure
  Threaded.end(:connection)
end

#ensure_primary ⇒ nil

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Set a flag on the node for the duration of provided block so that an exception is raised if the node is no longer the primary node.

Examples:

Ensure this node is primary.

node.ensure_primary do
  #...
end

Returns:

  • (nil) —

    nil.

Since:

  • 1.0.0



166
167
168
169
170
171
 
# File 'lib/moped/node.rb', line 166

def ensure_primary
  Threaded.begin(:ensure_primary)
  yield
ensure
  Threaded.end(:ensure_primary)
end

#get_more(database, collection, cursor_id, limit) ⇒ Message

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Execute a get more operation on the node.

Examples:

Execute a get more.

node.get_more(database, collection, 12345, -1)

Parameters:

  • database (Database) —

    The database to get more from.

  • collection (Collection) —

    The collection to get more from.

  • cursor_id (Integer) —

    The id of the cursor on the server.

  • limit (Integer) —

    The number of documents to limit.

Returns:

  • (Message) —

    The result of the operation.

Since:

  • 1.0.0



186
187
188
 
# File 'lib/moped/node.rb', line 186

def get_more(database, collection, cursor_id, limit)
  process(Protocol::GetMore.new(database, collection, cursor_id, limit))
end

#hash ⇒ Integer

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Get the hash identifier for the node.

Examples:

Get the hash identifier.

node.hash

Returns:

  • (Integer) —

    The hash identifier.

Since:

  • 1.0.0



198
199
200
 
# File 'lib/moped/node.rb', line 198

def hash
  resolved_address.hash
end

#insert(database, collection, documents, options = {}) ⇒ Message

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Insert documents into the database.

Examples:

Insert documents.

node.insert(database, collection, [{ name: "Tool" }])

Parameters:

  • database (Database) —

    The database to insert to.

  • collection (Collection) —

    The collection to insert to.

  • documents (Array<Hash>) —

    The documents to insert.

Returns:

  • (Message) —

    The result of the operation.

Since:

  • 1.0.0



237
238
239
 
# File 'lib/moped/node.rb', line 237

def insert(database, collection, documents, options = {})
  process(Protocol::Insert.new(database, collection, documents, options))
end

#inspect ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



435
436
437
 
# File 'lib/moped/node.rb', line 435

def inspect
  "<#{self.class.name} resolved_address=#{@resolved_address.inspect}>"
end

#kill_cursors(cursor_ids) ⇒ Message

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Kill all provided cursors on the node.

Examples:

Kill all the provided cursors.

node.kill_cursors([ 12345 ])

Parameters:

Returns:

  • (Message) —

    The result of the operation.

Since:

  • 1.0.0



251
252
253
 
# File 'lib/moped/node.rb', line 251

def kill_cursors(cursor_ids)
  process(Protocol::KillCursors.new(cursor_ids))
end

#needs_refresh?(time) ⇒ true, false

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Does the node need to be refreshed?

Examples:

Does the node require refreshing?

node.needs_refresh?(time)

Parameters:

  • time (Time) —

    The next referesh time.

Returns:

  • (true, false) —

    Whether the node needs to be refreshed.

Since:

  • 1.0.0



265
266
267
 
# File 'lib/moped/node.rb', line 265

def needs_refresh?(time)
  !@refreshed_at || @refreshed_at < time
end

#passive? ⇒ true, false

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Is the node passive?

Examples:

Is the node passive?

node.passive?

Returns:

  • (true, false) —

    If the node is passive.

Since:

  • 1.0.0



321
322
323
 
# File 'lib/moped/node.rb', line 321

def passive?
  @passive
end

#pipeline ⇒ nil

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Execute a pipeline of commands, for example a safe mode persist.

Examples:

Execute a pipeline.

node.pipeline do
  #...
end

Returns:

  • (nil) —

    nil.

Since:

  • 1.0.0



279
280
281
282
283
284
285
286
287
 
# File 'lib/moped/node.rb', line 279

def pipeline
  Threaded.begin(:pipeline)
  begin
    yield
  ensure
    Threaded.end(:pipeline)
  end
  flush unless Threaded.executing?(:pipeline)
end

#primary? ⇒ true, false

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Is the node the replica set primary?

Examples:

Is the node the primary?

node.primary?

Returns:

  • (true, false) —

    If the node is the primary.

Since:

  • 1.0.0



297
298
299
 
# File 'lib/moped/node.rb', line 297

def primary?
  @primary
end

#query(database, collection, selector, options = {}) ⇒ Message

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Execute a query on the node.

Examples:

Execute a query.

node.query(database, collection, { name: "Tool" })

Parameters:

  • database (Database) —

    The database to query from.

  • collection (Collection) —

    The collection to query from.

  • selector (Hash) —

    The query selector.

  • options (Hash) (defaults to: {}) —

    The query options.

Returns:

  • (Message) —

    The result of the operation.

Raises:

  • (QueryFailure) —

    If the query had an error.

Since:

  • 1.0.0



340
341
342
343
344
345
346
347
348
349
 
# File 'lib/moped/node.rb', line 340

def query(database, collection, selector, options = {})
  operation = Protocol::Query.new(database, collection, selector, options)

  process operation do |reply|
    if reply.flags.include?(:query_failure)
      raise Errors::QueryFailure.new(operation, reply.documents.first)
    end
    reply
  end
end

#refresh ⇒ nil

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns nil.

Returns:

  • (nil) —

    nil.

Raises:

  • (ReplicaSetReconfigured) —

    If the node is no longer a primary node and refresh was called within an #ensure_primary block.

Since:

  • 1.0.0



365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
 
# File 'lib/moped/node.rb', line 365

def refresh
  info = command("admin", ismaster: 1)

  @refreshed_at = Time.now
  primary = true if info["ismaster"]
  secondary = true if info["secondary"]

  peers = []
  peers.push(info["primary"]) if info["primary"]
  peers.concat(info["hosts"]) if info["hosts"]
  peers.concat(info["passives"]) if info["passives"]
  peers.concat(info["arbiters"]) if info["arbiters"]

  @peers = peers.map { |peer| Node.new(peer) }
  @primary, @secondary = primary, secondary
  @arbiter = info["arbiterOnly"]
  @passive = info["passive"]

  if !primary && Threaded.executing?(:ensure_primary)
    raise Errors::ReplicaSetReconfigured, "#{inspect} is no longer the primary node."
  end
end

#remove(database, collection, selector, options = {}) ⇒ Message

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Execute a remove command for the provided selector.

Examples:

Remove documents.

node.remove(database, collection, { name: "Tool" })

Parameters:

  • database (Database) —

    The database to remove from.

  • collection (Collection) —

    The collection to remove from.

  • selector (Hash) —

    The query selector.

  • options (Hash) (defaults to: {}) —

    The remove options.

Returns:

  • (Message) —

    The result of the operation.

Since:

  • 1.0.0



401
402
403
 
# File 'lib/moped/node.rb', line 401

def remove(database, collection, selector, options = {})
  process(Protocol::Delete.new(database, collection, selector, options))
end

#secondary? ⇒ true, false

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Is the node a replica set secondary?

Examples:

Is the node a secondary?

node.secondary?

Returns:

  • (true, false) —

    If the node is a secondary.

Since:

  • 1.0.0



413
414
415
 
# File 'lib/moped/node.rb', line 413

def secondary?
  @secondary
end

#update(database, collection, selector, change, options = {}) ⇒ Message

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Execute an update command for the provided selector.

Examples:

Update documents.

node.update(database, collection, { name: "Tool" }, { likes: 1000 })

Parameters:

  • database (Database) —

    The database to update.

  • collection (Collection) —

    The collection to update.

  • selector (Hash) —

    The query selector.

  • change (Hash) —

    The updates.

  • options (Hash) (defaults to: {}) —

    The update options.

Returns:

  • (Message) —

    The result of the operation.

Since:

  • 1.0.0



431
432
433
 
# File 'lib/moped/node.rb', line 431

def update(database, collection, selector, change, options = {})
  process(Protocol::Update.new(database, collection, selector, change, options))
end