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



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# File 'lib/moped/node.rb', line 227

def initialize(address)
  @address = address
  @timeout = 5
  @down_at = nil
  @refreshed_at = nil
  @primary = nil
  @secondary = nil
  resolve_address
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. 



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

def address
  @address
end

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



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# 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. 



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# 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) 



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# 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. 



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

def ip_address
  @ip_address
end

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



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# 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. 



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

def peers
  @peers
end

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



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# 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. 



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

def port
  @port
end

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



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# 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. 



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

def resolved_address
  @resolved_address
end

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



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# 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. 



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

def timeout
  @timeout
end

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



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# 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



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# 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



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# 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



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

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



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# 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



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# 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



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# 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



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# 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::QueryFailure => e
    # We might have a replica set change with:
    # "failed with error 13435: "not master and slaveOk=false"
    if e.details['code'] == 13435
      raise Errors::ReplicaSetReconfigured
    end
    raise
  rescue Errors::OperationFailure => e
    # We might have a replica set change with:
    # "failed with error 10054: "not master"
    if e.details['code'] == 10054
      raise Errors::ReplicaSetReconfigured
    end
    raise
  rescue Errors::AuthenticationFailure, Errors::CursorNotFound
    # 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



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# File 'lib/moped/node.rb', line 180

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.

Raises:

  • (CursorNotFound) —

    if the cursor has been killed

Since:

  • 1.0.0



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# File 'lib/moped/node.rb', line 201

def get_more(database, collection, cursor_id, limit)
  reply = process(Protocol::GetMore.new(database, collection, cursor_id, limit))
  raise Moped::Errors::CursorNotFound.new("GET MORE", cursor_id) if reply.cursor_not_found?
  reply
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



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# File 'lib/moped/node.rb', line 215

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



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# File 'lib/moped/node.rb', line 249

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. 



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# File 'lib/moped/node.rb', line 460

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



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# File 'lib/moped/node.rb', line 263

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



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# File 'lib/moped/node.rb', line 277

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



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# File 'lib/moped/node.rb', line 333

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



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# File 'lib/moped/node.rb', line 291

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



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

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



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# File 'lib/moped/node.rb', line 352

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

  process(operation) do |reply|
    if reply.query_failed?
      if reply.unauthorized? && auth.has_key?(database)
        # If we got here, most likely this is the case of Moped
        # authenticating successfully against the node originally, but the
        # node has been reset or gone down and come back up. The most
        # common case here is a rs.stepDown() which will reinitialize the
        # connection. In this case we need to requthenticate and try again,
        # otherwise we'll just raise the error to the user.
        (database, *auth[database])
        query(database, collection, selector, options)
      else
        raise Errors::QueryFailure.new(operation, reply.documents.first)
      end
    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



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# File 'lib/moped/node.rb', line 388

def refresh
  if resolve_address
    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
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



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# File 'lib/moped/node.rb', line 426

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



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# File 'lib/moped/node.rb', line 438

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



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# File 'lib/moped/node.rb', line 456

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