Class: CarrierWave::Storage::PostgresqlTable::File

Inherits:
Object
  • Object
show all
Defined in:
lib/carrierwave/storage/postgresql_table.rb

Constant Summary collapse

READ_CHUNK_SIZE = 
16_384
STREAM_CHUNK_SIZE = 
16_384

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ File 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 58

def initialize(path)
  @path = path
  @record = CarrierWaveFile.find_or_initialize_by(:path => path)
  @read_pos = 0
end

Instance Attribute Details

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 56

def path
  @path
end

Instance Method Details

#content_type ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 119

def content_type
  @record.content_type
end

#content_type=(new_content_type) ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 123

def content_type=(new_content_type)
  @record.update_attribute(:content_type, new_content_type)
end

#delete ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 192

def delete
  CarrierWaveFile.delete_all_files("id = #{CarrierWaveFile.connection.quote(@record.id)}")
end

#eof? ⇒ Boolean 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 111

def eof?
  @read_pos == self.size
end

#exists? ⇒ Boolean 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 178

def exists?
  @record && @record.persisted?
end

#filename ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 99

def filename
  ::File.basename(@path)
end

#last_modified ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 103

def last_modified
  @record.updated_at
end

#move_to(new_path) ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 182

def move_to(new_path)
  CarrierWaveFile.transaction do
    # Remove any existing files at the current path.
    CarrierWaveFile.delete_all_files("path = #{CarrierWaveFile.connection.quote(new_path)} AND id != #{CarrierWaveFile.connection.quote(@record.id)}")

    # Change the current record's path to the new path.
    @record.update_attribute(:path, new_path)
  end
end

#read(length = nil, buffer = nil) ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 64

def read(length = nil, buffer = nil)
  data = nil
  CarrierWaveFile.transaction do
    raw_connection = CarrierWaveFile.connection.raw_connection

    begin
      lo = raw_connection.lo_open(@record.pg_largeobject_oid)
      if length
        raw_connection.lo_lseek(lo, @read_pos, PG::SEEK_SET)
        data = raw_connection.lo_read(lo, length)
        @read_pos = raw_connection.lo_tell(lo)
      else
        data = raw_connection.lo_read(lo, self.size)
      end
    ensure
      raw_connection.lo_close(lo) if lo
    end
  end

  if (buffer && data)
    buffer.replace(data)
  end

  data
end

#rewind ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 115

def rewind
  @read_pos = 0
end

#size ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 107

def size
  @size = @record.size || fetch_size
end

#store(new_file) ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 131

def store(new_file)
  CarrierWaveFile.transaction do
    connection = CarrierWaveFile.connection
    raw_connection = connection.raw_connection
    oid = nil
    if new_file.kind_of?(CarrierWave::Storage::PostgresqlTable::File)
      file = new_file
    else
      file = new_file.to_file
    end

    begin
      oid = @record.pg_largeobject_oid || raw_connection.lo_creat
      handle = raw_connection.lo_open(oid, PG::INV_WRITE)
      raw_connection.lo_truncate(handle, 0)
      buffer = String.new # rubocop:disable Style/EmptyLiteral
      until file.eof?
        file.read(READ_CHUNK_SIZE, buffer)
        raw_connection.lo_write(handle, buffer)
      end
      file.rewind
    ensure
      raw_connection.lo_close(handle)
    end

    begin
      old_oid = @record.pg_largeobject_oid
      @record.pg_largeobject_oid = oid
      @record.size = new_file.size
      @record.content_type = new_file.content_type
      @record.save

      # Cleanup old, unused largeobject OIDs if we're updating the
      # record with a new OID reference.
      if (old_oid && old_oid != oid)
        old_references = connection.select_value("SELECT COUNT(*) FROM #{CarrierWaveFile.table_name} WHERE pg_largeobject_oid = #{CarrierWaveFile.connection.quote(old_oid)}").to_i
        if (old_references == 0)
          raw_connection.lo_unlink(old_oid)
        end
      end
    rescue ::ActiveRecord::RecordNotUnique
      @record = CarrierWaveFile.find_or_initialize_by(:path => @path)
      retry
    end
  end
end

#to_tempfile ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 90

def to_tempfile
  Tempfile.new(:binmode => true).tap do |tempfile|
    IO.copy_stream(self, tempfile)
    self.rewind
    tempfile.rewind
    tempfile.fsync
  end
end

#url(_options = {}) ⇒ Object 



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# File 'lib/carrierwave/storage/postgresql_table.rb', line 127

def url(_options = {})
  ::File.join("/", @path)
end