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// file : brep/module.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#include <brep/module>
#include <stdexcept>
#include <string>
#include <functional> // bind()
#include <cstring> // strncmp()
#include <httpd/httpd.h>
#include <web/module>
#include <web/apache/log>
using namespace std;
using namespace placeholders; // For std::bind's _1, etc.
namespace brep
{
void module::
handle (request& rq, response& rs, log& l)
{
log_ = &l;
const basic_mark error (severity::error, log_writer_, __PRETTY_FUNCTION__);
try
{
handle (rq, rs);
}
catch (const invalid_request& e)
{
if (e.description.empty ())
{
rs.status (e.status);
}
else
{
try
{
rs.content (e.status, "text/html;charset=utf-8") << e.description;
}
catch (const sequence_error& se)
{
error << se.what ();
rs.status (e.status);
}
}
}
catch (server_error& e) // Non-const because of move() below.
{
log_write (move (e.data));
rs.status (HTTP_INTERNAL_SERVER_ERROR);
}
catch (const exception& e)
{
error << e.what ();
rs.status (HTTP_INTERNAL_SERVER_ERROR);
}
catch (...)
{
error << "unknown error";
rs.status (HTTP_INTERNAL_SERVER_ERROR);
}
}
module::
module (): log_writer_ (bind (&module::log_write, this, _1)) {}
// Custom copy constructor is required to initialize log_writer_ properly.
//
module::
module (const module& m): module () {verb_ = m.verb_;}
// For function func declared like this:
// using B = std::string (*)(int);
// using A = B (*)(int,int);
// A func(B (*)(char),B (*)(wchar_t));
// __PRETTY_FUNCTION__ looks like this:
// virtual std::string (* (* brep::search::func(std::string (* (*)(char))(int)\
// ,std::string (* (*)(wchar_t))(int)) const)(int, int))(int)
//
string module::
func_name (const string& pretty_name)
{
string::size_type b (0);
string::size_type e (pretty_name.find (' '));
// Position b at beginning of supposed function name,
//
if (e != string::npos && !strncmp (pretty_name.c_str (), "virtual ", 8))
{
// Skip keyword virtual.
//
b = pretty_name.find_first_not_of (' ', e);
e = pretty_name.find (' ', b);
}
if (pretty_name.find ('(', b) > e)
{
// Not a constructor nor destructor. Skip type or *.
//
b = pretty_name.find_first_not_of (' ', e);
}
if (b != string::npos)
{
// Position e at the last character of supposed function name.
//
e = pretty_name.find_last_of (')');
if (e != string::npos && e > b)
{
size_t d (1);
while (--e > b && d)
{
switch (pretty_name[e])
{
case ')': ++d; break;
case '(': --d; break;
}
}
if (!d)
{
return pretty_name[b] == '(' && pretty_name[e] == ')' ?
// Not a name yet, go deeper.
//
func_name (string(pretty_name, b + 1, e - b - 1)) :
// Got the name.
//
string (pretty_name, b, e - b + 1);
}
}
}
throw invalid_argument ("");
}
void module::
log_write (diag_data&& d) const
{
if (log_ == nullptr)
return; // No backend yet.
auto al = dynamic_cast<::web::apache::log*> (log_);
if (al)
{
// Considered using lambda for mapping but looks too verbose while can
// be a bit safer in runtime.
//
static int s[] = { APLOG_ERR, APLOG_WARNING, APLOG_INFO, APLOG_TRACE1 };
for (const auto& e : d)
{
string name;
try
{
name = func_name (e.name);
}
catch (const invalid_argument&)
{
// Log "pretty" function description, see in log file & fix.
name = e.name;
}
al->write (e.loc.file.c_str(),
e.loc.line,
name.c_str(),
s[static_cast<int> (e.sev)],
e.msg.c_str());
}
}
//@@ Cast log_ to apache::log and write the records.
//
//@@ __PRETTY_FUNCTION__ contains a lot of fluff that we probably
// don't want in the logs (like return value and argument list;
// though the argument list would distinguish between several
// overloads). If that's the case, then this is probably the
// best place to process the name and convert something like:
//
// void module::handle(request, response)
//
// To just:
//
// module::handle
//
// Note to someone who is going to implement this: searching for a
// space to determine the end of the return type may not work if
// the return type is, say, a template id or a pointer to function
// type. It seems a more robust approach would be to scan backwards
// until we find the first ')' -- this got to be the end of the
// function argument list. Now we continue scanning backwards keeping
// track of the ')' vs '(' balance (arguments can also be of pointer
// to function type). Once we see an unbalanced '(', then we know this
// is the beginning of the argument list. Everything between it and
// the preceding space is the qualified function name. Good luck ;-).
//
// If we also use the name in handle() above (e.g., to return to
// the user as part of 505), then we should do it there as well
// (in which case factoring this functionality into a separate
// function seem to make a lot of sense).
//
}
}
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