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|
# frozen_string_literal: true
##
# This class is compatible with IO class (https://ruby-doc.org/core-2.3.1/IO.html)
# source: https://gitlab.com/snippets/1685610
module Gitlab
class HttpIO
BUFFER_SIZE = 128.kilobytes
InvalidURLError = Class.new(StandardError)
FailedToGetChunkError = Class.new(StandardError)
attr_reader :uri, :size
attr_reader :tell
attr_reader :chunk, :chunk_range
alias_method :pos, :tell
def initialize(url, size)
raise InvalidURLError unless ::Gitlab::UrlSanitizer.valid?(url)
@uri = URI(url)
@size = size
@tell = 0
end
def close
# no-op
end
def binmode
# no-op
end
def binmode?
true
end
def path
nil
end
def url
@uri.to_s
end
def seek(pos, where = IO::SEEK_SET)
new_pos =
case where
when IO::SEEK_END
size + pos
when IO::SEEK_SET
pos
when IO::SEEK_CUR
tell + pos
else
-1
end
raise '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, outbuf = nil)
out = []
length ||= size - tell
until length <= 0 || eof?
data = get_chunk
break if data.empty?
chunk_bytes = [BUFFER_SIZE - chunk_offset, length].min
data_slice = data.byteslice(0, chunk_bytes)
out << data_slice
@tell += data_slice.bytesize
length -= data_slice.bytesize
end
out = out.join
# If outbuf is passed, we put the output into the buffer. This supports IO.copy_stream functionality
if outbuf
outbuf.replace(out)
end
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.join
end
def write(data)
raise NotImplementedError
end
def truncate(offset)
raise NotImplementedError
end
def flush
raise NotImplementedError
end
def present?
true
end
private
##
# The below methods are not implemented in IO class
#
def in_range?
@chunk_range&.include?(tell)
end
def get_chunk
unless in_range?
response = Net::HTTP.start(uri.hostname, uri.port, proxy_from_env: true, use_ssl: uri.scheme == 'https') do |http|
http.request(request)
end
raise FailedToGetChunkError unless response.code == '200' || response.code == '206'
@chunk = response.body.force_encoding(Encoding::BINARY)
@chunk_range = response.content_range
##
# Note: If provider does not return content_range, then we set it as we requested
# Provider: minio
# - When the file size is larger than requested Content-range, the Content-range is included in responses with Net::HTTPPartialContent 206
# - When the file size is smaller than requested Content-range, the Content-range is included in responses with Net::HTTPPartialContent 206
# Provider: AWS
# - When the file size is larger than requested Content-range, the Content-range is included in responses with Net::HTTPPartialContent 206
# - When the file size is smaller than requested Content-range, the Content-range is included in responses with Net::HTTPPartialContent 206
# Provider: GCS
# - When the file size is larger than requested Content-range, the Content-range is included in responses with Net::HTTPPartialContent 206
# - When the file size is smaller than requested Content-range, the Content-range is included in responses with Net::HTTPOK 200
@chunk_range ||= (chunk_start...(chunk_start + @chunk.bytesize))
end
@chunk[chunk_offset..BUFFER_SIZE]
end
def request
Net::HTTP::Get.new(uri).tap do |request|
request.set_range(chunk_start, BUFFER_SIZE)
end
end
def chunk_offset
tell % BUFFER_SIZE
end
def chunk_start
(tell / BUFFER_SIZE) * BUFFER_SIZE
end
def chunk_end
[chunk_start + BUFFER_SIZE, size].min
end
end
end
|
