Class: Mongo::Grid::FSBucket::Stream::Write

Relationships & Source Files
Inherits:	Object
Defined in:	lib/mongo/grid/stream/write.rb

Overview

A stream that writes files to the ::Mongo::Grid::FSBucket.

Since:

2.1.0

Class Method Summary

.new(fs, options) ⇒ Write constructor

Create a stream for writing files to the ::Mongo::Grid::FSBucket.

Instance Attribute Summary

#closed? ⇒ true, false readonly

Is the stream closed.
#file_id ⇒ Object readonly
#filename ⇒ String readonly
#fs ⇒ FSBucket readonly
#options ⇒ Hash readonly

Instance Method Summary

#abort ⇒ true

Abort the upload by deleting all chunks already inserted.
#close ⇒ BSON::ObjectId, Object

Close the write stream.
#write(io) ⇒ Stream::Write

Write to the GridFS bucket from the source stream or a string.
#write_concern ⇒ Mongo::WriteConcern

Get the write concern used when uploading.
#chunks_collection private
#ensure_indexes! private
#ensure_open! private
#file_info private
#files_collection private
#update_length private
#with_write_concern(collection) private

Constructor Details

.new(fs, options) ⇒ `Write`

Create a stream for writing files to the ::Mongo::Grid::FSBucket.

Examples:

Create the stream.

Stream::Write.new(fs, options)

Parameters:

fs (FSBucket) —

The GridFS bucket object.
options (Hash) —

The write stream options.
opts (Hash) —

a customizable set of options

Options Hash (options):

:file_id (Object) —

The file id. An ObjectId is generated if the file id is not provided.
:write (Hash) —

Deprecated. Equivalent to :write_concern option.
:write_concern (Hash) —

The write concern options. Can be :w => Integer|String, :fsync => Boolean, :j => Boolean.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 70


def initialize(fs, options)
  @fs = fs
  @length = 0
  @n = 0
  @file_id = options[:file_id] || BSON::ObjectId.new
  @options = options.dup
=begin WriteConcern object support
  if @options[:write_concern].is_a?(WriteConcern::Base)
    # Cache the instance so that we do not needlessly reconstruct it.
    @write_concern = @options[:write_concern]
    @options[:write_concern] = @write_concern.options
  end
=end
  @options.freeze
  @filename = @options[:filename]
  @open = true
end

Instance Attribute Details

#closed? ⇒ `true`, `false` (readonly)

Is the stream closed.

Examples:

Is the stream closed.

stream.closed?

Returns:

(true, false) —

Whether the stream is closed.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 156


def closed?
  !@open
end

#file_id ⇒ `Object` (readonly)

Returns:

(Object) —

file_id The id of the file being uploaded.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 36


attr_reader :file_id

#filename ⇒ `String` (readonly)

Returns:

(String) —

filename The name of the file being uploaded.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 41


attr_reader :filename

#fs ⇒ FSBucket (readonly)

Returns:

(FSBucket) —

fs The fs bucket to which this stream writes.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 31


attr_reader :fs

#options ⇒ `Hash` (readonly)

Returns:

(Hash) —

options The write stream options.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 46


attr_reader :options

Instance Method Details

#abort ⇒ `true`

Abort the upload by deleting all chunks already inserted.

Examples:

Abort the write operation.

stream.abort

Returns:

(true) —

True if the operation was aborted and the stream is closed.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 168


def abort
  fs.chunks_collection.find({ :files_id => file_id }, @options).delete_many
  (@open = false) || true
end

#chunks_collection (private)

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 175


def chunks_collection
  with_write_concern(fs.chunks_collection)
end

#close ⇒ `BSON::ObjectId`, `Object`

Close the write stream.

Examples:

Close the stream.

stream.close

Returns:

(BSON::ObjectId, Object) —

The file id.

Raises:

(Error::ClosedStream) —

If the stream is already closed.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 124


def close
  ensure_open!
  update_length
  files_collection.insert_one(file_info, @options)
  @open = false
  file_id
end

#ensure_indexes! (private)

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 202


def ensure_indexes!
  fs.send(:ensure_indexes!)
end

#ensure_open! (private)

Raises:

(Error::ClosedStream)

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 206


def ensure_open!
  raise Error::ClosedStream.new if closed?
end

#file_info (private)

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 197


def file_info
  doc = { length: @length, _id: file_id, filename: filename }
  @file_info ||= File::Info.new(options.merge(doc))
end

#files_collection (private)

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 179


def files_collection
  with_write_concern(fs.files_collection)
end

#update_length (private)

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 193


def update_length
  file_info.document[:length] = @length
end

#with_write_concern(collection) (private)

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 183


def with_write_concern(collection)
  if write_concern.nil? || (collection.write_concern &&
    collection.write_concern.options == write_concern.options)
  then
    collection
  else
    collection.with(write: write_concern.options)
  end
end

#write(io) ⇒ Stream::Write

Write to the GridFS bucket from the source stream or a string.

Examples:

Write to GridFS.

stream.write(io)

Parameters:

io (String | IO) —

The string or IO object to upload from.

Returns:

(Stream::Write) —

self The write stream itself.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 98


def write(io)
  ensure_open!
  @indexes ||= ensure_indexes!
  @length += if io.respond_to?(:bytesize)
    # String objects
    io.bytesize
  else
    # IO objects
    io.size
  end
  chunks = File::Chunk.split(io, file_info, @n)
  @n += chunks.size
  chunks_collection.insert_many(chunks) unless chunks.empty?
  self
end

#write_concern ⇒ Mongo::WriteConcern

Get the write concern used when uploading.

Examples:

Get the write concern.

stream.write_concern

Returns:

(Mongo::WriteConcern) —

The write concern.

Since:

2.1.0

[ GitHub ]

# File 'lib/mongo/grid/stream/write.rb', line 140


def write_concern
  @write_concern ||= if wco = @options[:write_concern] || @options[:write]
    WriteConcern.get(wco)
  else
    fs.write_concern
  end
end

Class: Mongo::Grid::FSBucket::Stream::Write

Overview

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(fs, options) ⇒ Write

Instance Attribute Details

#closed? ⇒ true, false (readonly)

#file_id ⇒ Object (readonly)

#filename ⇒ String (readonly)

#fs ⇒ FSBucket (readonly)

#options ⇒ Hash (readonly)

Instance Method Details

#abort ⇒ true

#chunks_collection (private)

#close ⇒ BSON::ObjectId, Object

#ensure_indexes! (private)

#ensure_open! (private)

#file_info (private)

#files_collection (private)

#update_length (private)

#with_write_concern(collection) (private)

#write(io) ⇒ Stream::Write

#write_concern ⇒ Mongo::WriteConcern

.new(fs, options) ⇒ `Write`

#closed? ⇒ `true`, `false` (readonly)

#file_id ⇒ `Object` (readonly)

#filename ⇒ `String` (readonly)

#options ⇒ `Hash` (readonly)

#abort ⇒ `true`

#close ⇒ `BSON::ObjectId`, `Object`