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erlang.c
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erlang.c
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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2008 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Itai Zukerman <zukerman@math-hat.com> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include "php.h"
#include "php_ini.h"
#include "php_erlang.h"
int le_erlang_x_buff;
int le_erlang_pid;
ZEND_DECLARE_MODULE_GLOBALS(erlang)
static function_entry erlang_functions[] = {
PHP_FE(erlang_init, NULL)
PHP_FE(erlang_self, NULL)
PHP_FE(erlang_term, NULL)
PHP_FE(erlang_extract, NULL)
PHP_FE(erlang_send, NULL)
PHP_FE(erlang_send_reg, NULL)
PHP_FE(erlang_receive, NULL)
{NULL, NULL, NULL}
};
zend_module_entry erlang_module_entry = {
#if ZEND_MODULE_API_NO >= 20010901
STANDARD_MODULE_HEADER,
#endif
PHP_ERLANG_EXTNAME,
erlang_functions,
PHP_MINIT(erlang),
PHP_MSHUTDOWN(erlang),
PHP_RINIT(erlang),
PHP_RSHUTDOWN(erlang),
NULL,
#if ZEND_MODULE_API_NO >= 20010901
PHP_ERLANG_VERSION,
#endif
STANDARD_MODULE_PROPERTIES
};
#ifdef COMPILE_DL_ERLANG
ZEND_GET_MODULE(erlang)
#endif
PHP_INI_BEGIN()
PHP_INI_ENTRY("erlang.cookie", "PHP/Erlang", PHP_INI_SYSTEM, NULL)
PHP_INI_ENTRY("erlang.node", "erts@localhost", PHP_INI_SYSTEM, NULL)
PHP_INI_END()
static void php_erlang_init_globals( zend_erlang_globals *erlang_globals ) {
erlang_globals->instance = 0;
erlang_globals->fd = 0;
}
static void php_erlang_x_buff_dtor( zend_rsrc_list_entry *rsrc TSRMLS_DC ) {
ei_x_buff * x = (ei_x_buff *) rsrc->ptr;
if( x ) {
ei_x_free( x );
}
}
PHP_MINIT_FUNCTION(erlang)
{
REGISTER_INI_ENTRIES();
ZEND_INIT_MODULE_GLOBALS(erlang, php_erlang_init_globals, NULL);
le_erlang_x_buff = zend_register_list_destructors_ex( php_erlang_x_buff_dtor, NULL, PHP_ERLANG_X_BUFF_RES_NAME, module_number );
le_erlang_pid = zend_register_list_destructors_ex( NULL, NULL, PHP_ERLANG_PID_RES_NAME, module_number );
return SUCCESS;
}
PHP_MSHUTDOWN_FUNCTION(erlang)
{
UNREGISTER_INI_ENTRIES();
return SUCCESS;
}
PHP_RINIT_FUNCTION(erlang)
{
return SUCCESS;
}
PHP_RSHUTDOWN_FUNCTION(erlang)
{
fflush( stderr );
return SUCCESS;
}
PHP_FUNCTION(erlang_init)
{
char * node;
int fd;
int ret;
char buff[ 100 ];
fd = ERLANG_G(fd);
if( fd > 0 ) {
// Check connection. There must be a better way to do this.
// Doesn't this eat up valuable time?
php_error( E_NOTICE, "checking connection" );
while( 1 ) {
ret = ei_receive_tmo( fd, buff, 100, 1 );
if( ret == ERL_ERROR ) {
if( erl_errno != ETIMEDOUT ) {
php_error( E_NOTICE, "persistent connection timed out" );
close( fd );
fd = 0;
}
break;
}
}
}
if( fd == 0 ) {
// Connecting seems to sometimes fail without the "instance"
// number if this node has recently timed out. Perhaps the Erlang side
// doesn't like it if a node times out and then tries to reconnect with the
// same name?
// On the other hand, I've been told that these node names don't get
// garbage collected. Maybe I should roll instance over after some
// small number?
snprintf( buff, 100, "php%010d%05d", (int) getpid(), ERLANG_G(instance)++ );
ei_connect_init( & ERLANG_G(ec), buff, INI_STR("erlang.cookie"), 0 );
php_error( E_NOTICE, "init %s %s %s",
ei_thisnodename( & ERLANG_G(ec) ),
ei_thishostname( & ERLANG_G(ec) ),
ei_thisalivename( & ERLANG_G(ec) ) );
node = INI_STR("erlang.node");
fd = ei_connect( & ERLANG_G(ec), node );
if( fd < 0 ) {
php_error( E_ERROR, "couldn't connect to Erlang node `%s' %d", node, erl_errno );
RETURN_FALSE;
}
php_error( E_NOTICE, "connected to Erlang node `%s'", node );
ERLANG_G(fd) = fd;
}
RETURN_TRUE;
}
PHP_FUNCTION(erlang_self)
{
erlang_pid * pid;
pid = ei_self( & ERLANG_G(ec) );
ZEND_REGISTER_RESOURCE(return_value, pid, le_erlang_pid);
}
PHP_FUNCTION(erlang_term)
{
ei_x_buff * x;
char * fmt;
int len;
int idx = 0;
zval * z;
HashTable * arr;
HashPosition point;
int ret;
if( zend_parse_parameters( ZEND_NUM_ARGS() TSRMLS_CC, "sa", & fmt, & len, & z ) == FAILURE ) {
RETURN_FALSE;
}
arr = Z_ARRVAL_P(z);
zend_hash_internal_pointer_reset_ex( arr, & point );
x = emalloc( sizeof( ei_x_buff ) );
ei_x_new_with_version( x );
ret = php_erlang_encode_term( x, fmt, & idx, arr, & point );
if( ret < 0 ) {
php_error( E_ERROR, "problem parsing term format `%s' at position %d", fmt, idx );
RETURN_FALSE;
}
ZEND_REGISTER_RESOURCE(return_value, x, le_erlang_x_buff);
}
PHP_FUNCTION(erlang_extract)
{
zval * zterm, * ret;
ei_x_buff * x;
int version;
char atom[ MAXATOMLEN ];
if( zend_parse_parameters( ZEND_NUM_ARGS() TSRMLS_CC, "r", & zterm ) == FAILURE ) {
RETURN_FALSE;
}
ZEND_FETCH_RESOURCE(x, ei_x_buff *, & zterm, -1, PHP_ERLANG_X_BUFF_RES_NAME, le_erlang_x_buff);
x->index = 0;
ei_decode_version( x->buff, & x->index, & version );
ret = php_erlang_decode( x );
if( ret == NULL ) {
RETURN_FALSE;
} else {
* return_value = * ret;
}
}
PHP_FUNCTION(erlang_send)
{
zval * zpid, * zterm;
long timeout = 0;
erlang_pid * pid;
ei_x_buff * x;
int ret;
if( ERLANG_G(fd) == 0 ) {
php_error( E_ERROR, "not connected to an Erlang node" );
RETURN_FALSE;
}
if( zend_parse_parameters( ZEND_NUM_ARGS() TSRMLS_CC, "rr|l", & zpid, & zterm, & timeout ) == FAILURE ) {
RETURN_FALSE;
}
ZEND_FETCH_RESOURCE(pid, erlang_pid *, & zpid, -1, PHP_ERLANG_PID_RES_NAME, le_erlang_pid);
ZEND_FETCH_RESOURCE(x, ei_x_buff *, & zterm, -1, PHP_ERLANG_X_BUFF_RES_NAME, le_erlang_x_buff);
ret = ei_send_tmo( ERLANG_G(fd), pid, x->buff, x->index, timeout );
if( ret < 0 ) {
php_error( E_WARNING, "error [%d] sending message", ret );
RETURN_FALSE;
}
RETURN_TRUE;
}
PHP_FUNCTION(erlang_send_reg)
{
char * name;
int len;
zval * zterm;
long timeout = 0;
ei_x_buff * x;
int ret;
if( ERLANG_G(fd) == 0 ) {
php_error( E_ERROR, "not connected to an Erlang node" );
RETURN_FALSE;
}
if( zend_parse_parameters( ZEND_NUM_ARGS() TSRMLS_CC, "sr|l", & name, & len, & zterm, & timeout ) == FAILURE ) {
RETURN_FALSE;
}
ZEND_FETCH_RESOURCE(x, ei_x_buff *, & zterm, -1, PHP_ERLANG_X_BUFF_RES_NAME, le_erlang_x_buff);
ret = ei_reg_send_tmo( & ERLANG_G(ec), ERLANG_G(fd), name, x->buff, x->index, timeout );
if( ret < 0 ) {
php_error( E_ERROR, "error sending message" );
RETURN_FALSE;
}
RETURN_TRUE;
}
PHP_FUNCTION(erlang_receive)
{
long timeout = 0;
ei_x_buff * x;
erlang_msg msg;
int ret;
if( ERLANG_G(fd) == 0 ) {
php_error( E_ERROR, "not connected to an Erlang node" );
RETURN_FALSE;
}
if( zend_parse_parameters( ZEND_NUM_ARGS() TSRMLS_CC, "|l", & timeout ) == FAILURE ) {
RETURN_FALSE;
}
x = emalloc( sizeof( ei_x_buff ) );
ei_x_new( x );
while( 1 ) {
ret = ei_xreceive_msg_tmo( ERLANG_G(fd), & msg, x, timeout );
switch( ret ) {
case ERL_TICK:
break;
case ERL_MSG:
if( msg.msgtype == ERL_SEND ) {
ZEND_REGISTER_RESOURCE(return_value, x, le_erlang_x_buff);
return;
} else {
php_error( E_WARNING, "unknown message type [%d] received", msg.msgtype );
ei_x_free( x );
efree( x );
RETURN_FALSE;
}
break;
case ERL_ERROR:
if( erl_errno != ETIMEDOUT ) {
php_error( E_ERROR, "error [%d] reading message", erl_errno );
}
ei_x_free( x );
efree( x );
RETURN_FALSE;
default:
php_error( E_ERROR, "error [%d, %d] reading message", ret, erl_errno );
ei_x_free( x );
efree( x );
RETURN_FALSE;
}
}
}