Module: Libuv::Stream

Included in:
Pipe, TCP, TTY
Defined in:
lib/libuv/mixins/stream.rb

Constant Summary collapse

BACKLOG_ERROR = 
"backlog must be an Integer".freeze
WRITE_ERROR = 
"data must be a String".freeze
STREAM_CLOSED_ERROR = 
"unable to write to a closed stream".freeze
CLOSED_HANDLE_ERROR = 
"handle closed before accept called".freeze

Instance Method Summary collapse

Instance Method Details

#listen(backlog) ⇒ Object 



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# File 'lib/libuv/mixins/stream.rb', line 11

def listen(backlog)
    return if @closed
    assert_type(Integer, backlog, BACKLOG_ERROR)
    error = check_result ::Libuv::Ext.listen(handle, Integer(backlog), callback(:on_listen))
    reject(error) if error
end

#progress(callback = nil, &blk) ⇒ Object 



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# File 'lib/libuv/mixins/stream.rb', line 94

def progress(callback = nil, &blk)
    @progress = callback || blk
end

#readable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libuv/mixins/stream.rb', line 84

def readable?
    return false if @closed
    ::Libuv::Ext.is_readable(handle) > 0
end

#shutdown ⇒ Object

Shutsdown the writes on the handle waiting until the last write is complete before triggering the callback



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# File 'lib/libuv/mixins/stream.rb', line 33

def shutdown
    return if @closed
    error = check_result ::Libuv::Ext.shutdown(::Libuv::Ext.create_request(:uv_shutdown), handle, callback(:on_shutdown))
    reject(error) if error
end

#start_read ⇒ Object

Starts reading from the handle



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# File 'lib/libuv/mixins/stream.rb', line 19

def start_read
    return if @closed
    error = check_result ::Libuv::Ext.read_start(handle, callback(:on_allocate), callback(:on_read))
    reject(error) if error
end

#stop_read ⇒ Object

Stops reading from the handle



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# File 'lib/libuv/mixins/stream.rb', line 26

def stop_read
    return if @closed
    error = check_result ::Libuv::Ext.read_stop(handle)
    reject(error) if error
end

#writable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libuv/mixins/stream.rb', line 89

def writable?
    return false if @closed
    ::Libuv::Ext.is_writable(handle) > 0
end

#write(data) ⇒ Object 



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# File 'lib/libuv/mixins/stream.rb', line 39

def write(data)
    # NOTE:: Similar to udp.rb -> write
    deferred = @loop.defer
    if !@closed
        begin
            assert_type(String, data, WRITE_ERROR)

            size         = data.respond_to?(:bytesize) ? data.bytesize : data.size
            buffer       = ::Libuv::Ext.buf_init(FFI::MemoryPointer.from_string(data), size)

            # local as this variable will be avaliable until the handle is closed
            @write_callbacks ||= []

            #
            # create the curried callback
            #
            callback = FFI::Function.new(:void, [:pointer, :int]) do |req, status|
                ::Libuv::Ext.free(req)
                # remove the callback from the array
                # assumes writes are done in order
                promise = @write_callbacks.shift[0]
                resolve promise, status
            end


            @write_callbacks << [deferred, callback]
            req = ::Libuv::Ext.create_request(:uv_write)
            error = check_result ::Libuv::Ext.write(req, handle, buffer, 1, callback)

            if error
                @write_callbacks.pop
                ::Libuv::Ext.free(req)
                deferred.reject(error)

                reject(error)       # close the handle
            end
        rescue Exception => e
            deferred.reject(e)  # this write exception may not be fatal
        end
    else
        deferred.reject(RuntimeError.new(STREAM_CLOSED_ERROR))
    end
    deferred.promise
end