transmission/libtransmission/trevent.c

240 lines
5.9 KiB
C

/*
* This file Copyright (C) 2007 Charles Kerr <charles@rebelbase.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h> /* for evhttp */
#include <sys/types.h> /* for evhttp */
#ifdef WIN32
#include <fcntl.h>
#define pipe(f) _pipe(f, 1000, _O_BINARY)
#else
#include <unistd.h>
#endif
#include <event.h>
#include <evhttp.h>
#include "transmission.h"
#include "platform.h"
#include "utils.h"
/* #define DEBUG */
#ifdef DEBUG
#include <stdio.h>
#undef tr_dbg
#define tr_dbg( a, b... ) fprintf(stderr, a "\n", ##b )
#endif
/***
****
***/
typedef struct tr_event_handle_s
{
int fds[2];
tr_lock_t * lock;
tr_handle_t * h;
struct event_base * base;
struct event pipeEvent;
}
tr_event_handle_t;
#ifdef DEBUG
static int reads = 0;
static int writes = 0;
#endif
void
readFromPipe( int fd, short eventType UNUSED, void * unused UNUSED )
{
char ch;
int ret;
struct event * event;
struct timeval interval;
struct evhttp_connection * evcon;
struct evhttp_request * req;
enum evhttp_cmd_type type;
char * uri;
#ifdef DEBUG
fprintf( stderr, "reading...reads: [%d] writes: [%d]\n", ++reads, writes );
#endif
ch = '\0';
do {
ret = read( fd, &ch, 1 );
} while ( ret<0 && errno==EAGAIN );
if( ret < 0 )
{
tr_err( "Couldn't read from libevent pipe: %s", strerror(errno) );
}
else switch( ch )
{
case 'd': /* event_del */
read( fd, &event, sizeof(struct event*) );
tr_dbg( "read del event from pipe: event is %p", event );
event_del( event );
tr_free( event );
break;
case 'e': /* event_add */
read( fd, &event, sizeof(struct event*) );
read( fd, &interval, sizeof(struct timeval) );
tr_dbg( "read event from pipe: event.ev_arg is %p", event->ev_arg );
event_add( event, &interval );
break;
case 'h': /* http_make_request */
ret = read( fd, &evcon, sizeof(struct evhttp_connection*) );
read( fd, &req, sizeof(struct evhttp_request*) );
read( fd, &type, sizeof(enum evhttp_cmd_type) );
read( fd, &uri, sizeof(char*) );
tr_dbg( "read http req from pipe: req.cb_arg is %p", req->cb_arg );
evhttp_make_request( evcon, req, type, uri );
tr_free( uri );
break;
default:
assert( 0 && "unhandled event pipe condition!" );
}
}
static void
logFunc( int severity, const char * message )
{
switch( severity )
{
case _EVENT_LOG_DEBUG:
tr_dbg( "%s", message );
break;
case _EVENT_LOG_ERR:
tr_err( "%s", message );
break;
default:
tr_inf( "%s", message );
break;
}
}
static void
libeventThreadFunc( void * veh )
{
tr_event_handle_t * eh = (tr_event_handle_t *) veh;
tr_dbg( "Starting libevent thread" );
eh->base = event_init( );
event_set_log_callback( logFunc );
/* listen to the pipe's read fd */
event_set( &eh->pipeEvent, eh->fds[0], EV_READ|EV_PERSIST, readFromPipe, NULL );
event_add( &eh->pipeEvent, NULL );
event_dispatch( );
event_del( &eh->pipeEvent );
tr_lockFree( eh->lock );
event_base_free( eh->base );
tr_free( eh );
tr_dbg( "Closing libevent thread" );
}
void
tr_eventInit( tr_handle_t * handle )
{
tr_event_handle_t * eh;
eh = tr_new0( tr_event_handle_t, 1 );
eh->lock = tr_lockNew( );
pipe( eh->fds );
eh->h = handle;
handle->events = eh;
tr_threadNew( libeventThreadFunc, eh, "libeventThreadFunc" );
}
void
tr_eventClose( tr_handle_t * handle )
{
tr_event_handle_t * eh = handle->events;
event_base_loopexit( eh->base, NULL );
}
void
tr_event_add( tr_handle_t * handle,
struct event * event,
struct timeval * interval )
{
const char ch = 'e';
int fd = handle->events->fds[1];
tr_lock_t * lock = handle->events->lock;
tr_lockLock( lock );
tr_dbg( "writing event to pipe: event.ev_arg is %p", event->ev_arg );
#ifdef DEBUG
fprintf( stderr, "reads: [%d] writes: [%d]\n", reads, ++writes );
#endif
write( fd, &ch, 1 );
write( fd, &event, sizeof(struct event*) );
write( fd, interval, sizeof(struct timeval) );
tr_lockUnlock( lock );
}
void
tr_event_del( tr_handle_t * handle,
struct event * event )
{
const char ch = 'd';
int fd = handle->events->fds[1];
tr_lock_t * lock = handle->events->lock;
tr_lockLock( lock );
tr_dbg( "writing event to pipe: del event %p", event );
#ifdef DEBUG
fprintf( stderr, "reads: [%d] writes: [%d]\n", reads, ++writes );
#endif
write( fd, &ch, 1 );
write( fd, &event, sizeof(struct event*) );
tr_lockUnlock( lock );
}
void
tr_evhttp_make_request (tr_handle_t * handle,
struct evhttp_connection * evcon,
struct evhttp_request * req,
enum evhttp_cmd_type type,
char * uri)
{
const char ch = 'h';
int fd = handle->events->fds[1];
tr_lock_t * lock = handle->events->lock;
tr_lockLock( lock );
tr_dbg( "writing HTTP req to pipe: req.cb_arg is %p", req->cb_arg );
#ifdef DEBUG
fprintf( stderr, "reads: [%d] writes: [%d]\n", reads, ++writes );
#endif
write( fd, &ch, 1 );
write( fd, &evcon, sizeof(struct evhttp_connection*) );
write( fd, &req, sizeof(struct evhttp_request*) );
write( fd, &type, sizeof(enum evhttp_cmd_type) );
write( fd, &uri, sizeof(char*) );
tr_lockUnlock( lock );
}