xahaud/beast/http/impl/parser.cpp

//------------------------------------------------------------------------------
/*
    This file is part of Beast: https://github.com/vinniefalco/Beast
    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#include <beast/http/parser.h>
#include <beast/http/impl/joyent_parser.h>
#include <beast/http/rfc2616.h>

namespace beast {
namespace http {

parser::parser (bool request)
{
    static_assert (sizeof(joyent::http_parser) == sizeof(state_t),
        "state_t size must match http_parser size");

    static_assert (sizeof(joyent::http_parser_settings) == sizeof(hooks_t),
        "hooks_t size must match http_parser_settings size");

    auto s (reinterpret_cast <joyent::http_parser*> (&state_));
    s->data = this;

    auto h (reinterpret_cast <joyent::http_parser_settings*> (&hooks_));
    h->on_message_begin     = &parser::cb_message_start;
    h->on_url               = &parser::cb_url;
    h->on_status            = &parser::cb_status;
    h->on_header_field      = &parser::cb_header_field;
    h->on_header_value      = &parser::cb_header_value;
    h->on_headers_complete  = &parser::cb_headers_complete;
    h->on_body              = &parser::cb_body;
    h->on_message_complete  = &parser::cb_message_complete;

    joyent::http_parser_init (s, request
        ? joyent::http_parser_type::HTTP_REQUEST
        : joyent::http_parser_type::HTTP_RESPONSE);
}

std::pair <parser::error_code, std::size_t>
parser::write (void const* data, std::size_t bytes)
{
    std::pair <error_code, std::size_t> result (error_code(), 0);
    auto s (reinterpret_cast <joyent::http_parser*> (&state_));
    auto h (reinterpret_cast <joyent::http_parser_settings const*> (&hooks_));
    result.second = joyent::http_parser_execute (s, h,
        static_cast <const char*> (data), bytes);
    result.first = ec_;
    return result;
}

parser::error_code
parser::eof()
{
    auto s (reinterpret_cast <joyent::http_parser*> (&state_));
    auto h (reinterpret_cast <joyent::http_parser_settings const*> (&hooks_));
    joyent::http_parser_execute (s, h, nullptr, 0);
    return ec_;
}

//------------------------------------------------------------------------------

void
parser::check_header()
{
    if (! value_.empty())
    {
        rfc2616::trim_right_in_place (value_);
        on_field (field_, value_);
        field_.clear();
        value_.clear();
    }
}

int
parser::do_message_start ()
{
    complete_ = false;
    url_.clear();
    status_.clear();
    field_.clear();
    value_.clear();
    on_start();
    return 0;
}

int
parser::do_url (char const* in, std::size_t bytes)
{
    url_.append (static_cast <char const*> (in), bytes);
    return 0;
}

int
parser::do_status (char const* in, std::size_t bytes)
{
    status_.append (static_cast <char const*> (in), bytes);
    return 0;
}

int
parser::do_header_field (char const* in, std::size_t bytes)
{
    check_header();
    field_.append (static_cast <char const*> (in), bytes);
    return 0;
}

int
parser::do_header_value (char const* in, std::size_t bytes)
{
    value_.append (static_cast <char const*> (in), bytes);
    return 0;
}

/*  Called when all the headers are complete but before
    the content body, if present.
    Returning 1 from here tells the joyent parser
    that the message has no body (e.g. a HEAD request).
*/
int
parser::do_headers_complete()
{
    check_header();
    auto const p (reinterpret_cast <joyent::http_parser const*> (&state_));
    bool const keep_alive (joyent::http_should_keep_alive (p) != 0);
    if (p->type == joyent::http_parser_type::HTTP_REQUEST)
        return on_request (joyent::convert_http_method (
            joyent::http_method(p->method)), url_,
                p->http_major, p->http_minor, keep_alive, p->upgrade) ? 0 : 1;
    return on_response (p->status_code, status_,
        p->http_major, p->http_minor, keep_alive, p->upgrade) ? 0 : 1;
}

/*  Called repeatedly for the content body. The passed buffer
    has already had the transfer-encoding removed.
*/
int
parser::do_body (char const* in, std::size_t bytes)
{
    on_body (in, bytes);
    return 0;
}

/* Called when the both the headers and content body (if any) are complete. */
int
parser::do_message_complete ()
{
    complete_ = true;
    on_complete();
    return 0;
}

//------------------------------------------------------------------------------

int
parser::cb_message_start (joyent::http_parser* p)
{
    return reinterpret_cast <parser*> (
        p->data)->do_message_start();
}

int
parser::cb_url (joyent::http_parser* p,
    char const* in, std::size_t bytes)
{
    return reinterpret_cast <parser*> (
        p->data)->do_url (in, bytes);
}

int
parser::cb_status (joyent::http_parser* p,
    char const* in, std::size_t bytes)
{
    return reinterpret_cast <parser*> (
        p->data)->do_status (in, bytes);
}

int
parser::cb_header_field (joyent::http_parser* p,
    char const* in, std::size_t bytes)
{
    return reinterpret_cast <parser*> (
        p->data)->do_header_field (in, bytes);
}

int
parser::cb_header_value (joyent::http_parser* p,
    char const* in, std::size_t bytes)
{
    return reinterpret_cast <parser*> (
        p->data)->do_header_value (in, bytes);
}

int
parser::cb_headers_complete (joyent::http_parser* p)
{
    return reinterpret_cast <parser*> (
        p->data)->do_headers_complete();
}

int
parser::cb_body (joyent::http_parser* p,
    char const* in, std::size_t bytes)
{
    return reinterpret_cast <parser*> (
        p->data)->do_body (
            in, bytes);
}

int
parser::cb_message_complete (joyent::http_parser* p)
{
    return reinterpret_cast <parser*> (
        p->data)->do_message_complete();
}

} // http
} // beast