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// file : web/apache/service -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef WEB_APACHE_SERVICE
#define WEB_APACHE_SERVICE
#include <httpd/httpd.h>
#include <string>
#include <vector>
#include <cassert>
#include <algorithm> // move()
#include <web/module>
#include <web/apache/log>
#include <web/apache/request>
namespace web
{
namespace apache
{
class service: ::module
{
public:
using option_names = std::vector<std::string>;
// Note that the module exemplar is stored by-reference.
//
template <typename M>
service (const std::string& name,
M& exemplar,
option_names opts = option_names ())
: ::module
{
STANDARD20_MODULE_STUFF,
nullptr,
nullptr,
nullptr,
nullptr,
nullptr,
®ister_hooks<M>
},
name_ (name),
exemplar_ (exemplar),
option_names_ (std::move (opts))
{
init_directives();
// instance<M> () is invented to delegate processing from apache
// request handler C function to the service non static member
// function. This appoach resticts number of service objects per
// specific module implementation class with just one instance.
//
service*& srv (instance<M> ());
assert (srv == nullptr);
srv = this;
}
~service ()
{
delete [] cmds;
}
template <typename M>
static service*&
instance () noexcept
{
static service* instance;
return instance;
}
template <typename M>
static void
register_hooks (apr_pool_t*) noexcept
{
// The registered function is called right after apache worker
// process is started. Called for every new process spawned.
//
ap_hook_child_init (&worker_initializer<M>, NULL, NULL, APR_HOOK_LAST);
// The registered function is called for each client request.
//
ap_hook_handler (&request_handler<M>, NULL, NULL, APR_HOOK_LAST);
}
template <typename M>
static void
worker_initializer (apr_pool_t*, server_rec* server) noexcept
{
log l (server);
instance<M> ()->init_worker(l);
}
template <typename M>
static int
request_handler (request_rec* r) noexcept
{
auto srv (instance<M> ());
if (!r->handler || srv->name_ != r->handler) return DECLINED;
request req (r);
log l (r->server);
return srv->handle<M>(req, l);
}
private:
void
init_directives();
void
init_worker(log& l) noexcept;
static const char*
add_option (cmd_parms *parms, void *mconfig, const char *value) noexcept;
template <typename M>
int handle(request& r, log& l) noexcept;
private:
std::string name_;
module& exemplar_;
option_names option_names_;
name_values options_;
};
}
}
#include <web/apache/service.txx>
#endif // WEB_APACHE_SERVICE
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