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|
##
# ChunkedIO Engine
#
# Choose a chunk_store with your purpose
# This class is designed that it's compatible with IO class (https://ruby-doc.org/core-2.3.1/IO.html)
module Gitlab
module Ci
class Trace
module ChunkedFile
class ChunkedIO
# extend ChunkedFile::Concerns::Opener
include ChunkedFile::Concerns::Errors
include ChunkedFile::Concerns::Hooks
include ChunkedFile::Concerns::Callbacks
prepend ChunkedFile::Concerns::Permissions
attr_reader :size
attr_reader :tell
attr_reader :chunk, :chunk_range
attr_reader :job_id
attr_reader :mode
alias_method :pos, :tell
def initialize(job_id, size = nil, mode = 'rb', &block)
raise NotImplementedError, "Mode 'w' is not supported" if mode.include?('w')
@size = size || calculate_size(job_id)
@tell = 0
@job_id = job_id
@mode = mode
if block_given?
begin
yield self
ensure
self.close
end
end
end
def close
end
def binmode
# no-op
end
def binmode?
true
end
def seek(amount, where = IO::SEEK_SET)
new_pos =
case where
when IO::SEEK_END
size + amount
when IO::SEEK_SET
amount
when IO::SEEK_CUR
tell + amount
else
-1
end
raise ArgumentError, 'new position is outside of file' if new_pos < 0 || new_pos > size
@tell = new_pos
end
def eof?
tell == size
end
def each_line
until eof?
line = readline
break if line.nil?
yield(line)
end
end
def read(length = nil)
out = ""
until eof? || (length && out.length >= length)
data = get_chunk
break if data.empty?
out << data
@tell += data.bytesize
end
out = out[0, length] if length && out.length > length
out
end
def readline
out = ""
until eof?
data = get_chunk
new_line = data.index("\n")
if !new_line.nil?
out << data[0..new_line]
@tell += new_line + 1
break
else
out << data
@tell += data.bytesize
end
end
out
end
def write(data)
raise ArgumentError, 'Could not write empty data' unless data.present?
if mode.include?('w')
write_as_overwrite(data)
elsif mode.include?('a')
write_as_append(data)
end
end
def truncate(offset)
raise NotImplementedError
end
def flush
# no-op
end
def present?
chunks_count > 0
end
def delete
chunk_store.delete_all
end
private
def in_range?
@chunk_range&.include?(tell)
end
def get_chunk
unless in_range?
chunk_store.open(job_id, chunk_index, params_for_store) do |store|
@chunk = store.get
@chunk_range = (chunk_start...(chunk_start + chunk.length))
end
end
@chunk[chunk_offset..buffer_size]
end
def write_as_overwrite(data)
raise NotImplementedError, "Overwrite is not supported"
end
def write_as_append(data)
@tell = size
data_size = data.size
new_tell = tell + data_size
data_offset = 0
until tell == new_tell
writable_size = buffer_size - chunk_offset
writable_data = data[data_offset...(data_offset + writable_size)]
written_size = write_chunk(writable_data)
data_offset += written_size
@tell += written_size
@size = [tell, size].max
end
data_size
end
def write_chunk(data)
written_size = 0
chunk_store.open(job_id, chunk_index, params_for_store) do |store|
with_callbacks(:write_chunk, store) do
written_size = if store.size > 0 # # rubocop:disable ZeroLengthPredicate
store.append!(data)
else
store.write!(data)
end
raise WriteError, 'Written size mismatch' unless data.length == written_size
end
end
written_size
end
def params_for_store(c_index = chunk_index)
{
buffer_size: buffer_size,
chunk_start: c_index * buffer_size,
chunk_index: c_index
}
end
def chunk_offset
tell % buffer_size
end
def chunk_start
chunk_index * buffer_size
end
def chunk_end
[chunk_start + buffer_size, size].min
end
def chunk_index
(tell / buffer_size)
end
def chunks_count
(size / buffer_size.to_f).ceil
end
def last_range
((size / buffer_size) * buffer_size..size)
end
def chunk_store
raise NotImplementedError
end
def buffer_size
raise NotImplementedError
end
def calculate_size(job_id)
chunk_store.chunks_size(job_id)
end
end
end
end
end
end
|
