diff options
Diffstat (limited to 'lib/unicorn/stream_input.rb')
-rw-r--r-- | lib/unicorn/stream_input.rb | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/lib/unicorn/stream_input.rb b/lib/unicorn/stream_input.rb new file mode 100644 index 0000000..2a05337 --- /dev/null +++ b/lib/unicorn/stream_input.rb @@ -0,0 +1,152 @@ +# -*- encoding: binary -*- + +# When processing uploads, Unicorn may expose a StreamInput object under +# "rack.input" of the Rack (2.x) environment. +class Unicorn::StreamInput + # The I/O chunk size (in +bytes+) for I/O operations where + # the size cannot be user-specified when a method is called. + # The default is 16 kilobytes. + @@io_chunk_size = Unicorn::Const::CHUNK_SIZE + + # Initializes a new StreamInput object. You normally do not have to call + # this unless you are writing an HTTP server. + def initialize(socket, request) + @chunked = request.content_length.nil? + @socket = socket + @parser = request + @buf = request.buf + @rbuf = '' + @bytes_read = 0 + filter_body(@rbuf, @buf) unless @buf.empty? + end + + # :call-seq: + # ios.read([length [, buffer ]]) => string, buffer, or nil + # + # Reads at most length bytes from the I/O stream, or to the end of + # file if length is omitted or is nil. length must be a non-negative + # integer or nil. If the optional buffer argument is present, it + # must reference a String, which will receive the data. + # + # At end of file, it returns nil or '' depend on length. + # ios.read() and ios.read(nil) returns ''. + # ios.read(length [, buffer]) returns nil. + # + # If the Content-Length of the HTTP request is known (as is the common + # case for POST requests), then ios.read(length [, buffer]) will block + # until the specified length is read (or it is the last chunk). + # Otherwise, for uncommon "Transfer-Encoding: chunked" requests, + # ios.read(length [, buffer]) will return immediately if there is + # any data and only block when nothing is available (providing + # IO#readpartial semantics). + def read(*args) + length = args.shift + rv = args.shift || '' + if length.nil? + rv.replace(@rbuf) + @rbuf.replace('') + @socket or return rv + until eof? + @socket.kgio_read(@@io_chunk_size, @buf) or eof! + filter_body(@rbuf, @buf) + rv << @rbuf + end + @rbuf.replace('') + else + if length <= @rbuf.size + rv.replace(@rbuf.slice(0, length)) + @rbuf.replace(@rbuf.slice(length, @rbuf.size) || '') + else + rv.replace(@rbuf) + length -= @rbuf.size + @rbuf.replace('') + until length == 0 || eof? || (rv.size > 0 && @chunked) + @socket.kgio_read(length, @buf) or eof! + filter_body(@rbuf, @buf) + rv << @rbuf + length -= @rbuf.size + @rbuf.replace('') + end + end + rv = nil if rv.empty? + end + rv + end + + # :call-seq: + # ios.gets => string or nil + # + # Reads the next ``line'' from the I/O stream; lines are separated + # by the global record separator ($/, typically "\n"). A global + # record separator of nil reads the entire unread contents of ios. + # Returns nil if called at the end of file. + # This takes zero arguments for strict Rack::Lint compatibility, + # unlike IO#gets. + def gets + sep = $/ + if sep.nil? + rv = read + return rv.empty? ? nil : rv + end + re = /\A(.*?#{Regexp.escape(sep)})/ + + begin + @rbuf.gsub!(re, '') and return $1 + if eof? + if @rbuf.empty? + return nil + else + rv = @rbuf.dup + @rbuf.replace('') + return rv + end + end + @socket.kgio_read(@@io_chunk_size, @buf) or eof! + filter_body(once = '', @buf) + @rbuf << once + end while true + end + + # :call-seq: + # ios.each { |line| block } => ios + # + # Executes the block for every ``line'' in *ios*, where lines are + # separated by the global record separator ($/, typically "\n"). + def each(&block) + while line = gets + yield line + end + + self # Rack does not specify what the return value is here + end + +private + + def eof? + if @parser.body_eof? + until @parser.parse + once = @socket.kgio_read(@@io_chunk_size) or eof! + @buf << once + end + @socket = nil + true + else + false + end + end + + def filter_body(dst, src) + rv = @parser.filter_body(dst, src) + @bytes_read += dst.size + rv + end + + def eof! + # in case client only did a premature shutdown(SHUT_WR) + # we do support clients that shutdown(SHUT_WR) after the + # _entire_ request has been sent, and those will not have + # raised EOFError on us. + @socket.close if @socket + raise Unicorn::ClientShutdown, "bytes_read=#{@bytes_read}", [] + end +end |