zephyr/lib/iot
Flavio Santes b965fb5ff1 iot: Add HTTP support for Zephyr
This commit adds HTTP message handling support for Zephyr.
So, no network routines are involved at this level.

To add HTTP message handling support for Zephyr, we explored the
following options:

1. Importing an external project and perhaps adapting it to fit our
   requirements.
   The criteria to pick one codebase among all the available projects
   are: licensing, correctness and performance.

2. Writing our own implementation from scratch.

We decided to import an external project instead of implementing our
own parser, mainly due to code maturity and correctness. It could take
more time to obtain a production-ready parser from scratch than adapting
a state-of-art library.

The following is a list of some projects offering similar functionality.

lighttpd (many files)
	* License: revised BSD license
	* Supported: active
	* Comments: this parser can't be integrated to Zephyr due to
	  dependencies that currently are not satisficed by our SDK.

nginx (src/http/ngx_http_parse.c)
	* License: 2-clause BSD-like
	* Supported: very active
	* Comments: this parser can't be integrated to Zephyr due to
	  dependencies that currently are not satisficed by our SDK.

wget (src/http-parse.c)
	* License: GPL 3.0
	* Supported: very active
	* Comments: this code can't be included in Zephyr due to
	  licensing issues

curl (lib/http.c)
	* License: MIT/X derivate, see:
	  https://curl.haxx.se/docs/copyright.html
	* Supported: very active
	* Comment: it must be forked and adapted to run in Zephyr.
	  It is not optimized for low-power devices.

nodejs http-parser (http_parser.c)
	* License: nginx license (2-clause BSD-like) and MIT license
	* Supported: very active
	* Comments: optimized with performance in mind.
	  From https://github.com/nodejs/http-parser: "It does
	  not make any syscalls nor allocations, it does not buffer data,
	  it can be interrupted at anytime. It only requires about 40
	  bytes of data per message stream."

So, nodejs/http-parser looks a very good choice for Zephyr. In this
commit, we integrate nodejs' parser to Zephyr.

Origin: https://github.com/nodejs/http-parser/releases/tag/v2.7.1
        https://github.com/nodejs/http-parser/archive/v2.7.1.tar.gz

NOTE:
	This patch reformats the http_parser files to reduce checkpatch
	warnings. Changes made in this refactoring are available at:
Repo:	https://gitlab.com/santes/http_parser/commits/refactoring1
Commit:	9ccfaa23f1c8438855211fa902ec8e7236b702b1

Jira: ZEP-346
Jira: ZEP-776

Change-Id: I29b1d47f323a5841cd4d0a2afbc2cc83a0f576f0
Signed-off-by: Flavio Santes <flavio.santes@intel.com>
2016-12-02 12:41:20 +02:00
..
dns net: Rename net_nbuf_write to net_nbuf_append 2016-12-02 12:40:51 +02:00
http iot: Add HTTP support for Zephyr 2016-12-02 12:41:20 +02:00
mqtt iot/mqtt: Add the MQTT high-level API 2016-12-02 12:41:09 +02:00
zoap iot/zoap: Increase the range of timeouts 2016-12-02 12:41:12 +02:00
Kbuild iot: Add HTTP support for Zephyr 2016-12-02 12:41:20 +02:00
Kconfig iot: Add HTTP support for Zephyr 2016-12-02 12:41:20 +02:00
Makefile iot: Add HTTP support for Zephyr 2016-12-02 12:41:20 +02:00