Vapor-3-Chunked-Responses.swift

/*
#
# Copyright (c) 2018 Felix Schwarz (@felix_schwarz), IOSPIRIT GmbH (@iospirit)
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
*/

import Routing
import Vapor

public func routes(_ router: Router) throws {
	router.get("stream") {	req -> Response in
		let response = req.makeResponse()
		let stream = HTTPChunkedStream(on: req)
		let bbAllocator : ByteBufferAllocator = (req.http.channel?.allocator != nil) ? req.http.channel!.allocator : ByteBufferAllocator()

		response.http.body = HTTPBody(chunked: stream)

		DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: DispatchTime.now() + 1, execute: {
			var buffer : ByteBuffer = bbAllocator.buffer(capacity: 100)

			buffer.write(string: "First")

			req.eventLoop.execute {
				_ = stream.write(.chunk(buffer))
			}
		})


		DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: DispatchTime.now() + 2, execute: {
			var buffer : ByteBuffer = bbAllocator.buffer(capacity: 100)

			buffer.write(string: "Second")

			req.eventLoop.execute {
				_ = stream.write(.chunk(buffer))
			}
		})

		DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: DispatchTime.now() + 3, execute: {
			req.eventLoop.execute {
				_ = stream.write(.end)
			}
		})

		return response
	}
}