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ngx_http_lua_socket_udp.c
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/*
* Copyright (C) Yichun Zhang (agentzh)
*/
#ifndef DDEBUG
#define DDEBUG 0
#endif
#include "ddebug.h"
#include "ngx_http_lua_socket_udp.h"
#include "ngx_http_lua_socket_tcp.h"
#include "ngx_http_lua_util.h"
#include "ngx_http_lua_contentby.h"
#include "ngx_http_lua_output.h"
#include "ngx_http_lua_probe.h"
#if 1
#undef ngx_http_lua_probe_info
#define ngx_http_lua_probe_info(msg)
#endif
#define UDP_MAX_DATAGRAM_SIZE 65536
static int ngx_http_lua_socket_udp(lua_State *L);
static int ngx_http_lua_socket_udp_setpeername(lua_State *L);
static int ngx_http_lua_socket_udp_send(lua_State *L);
static int ngx_http_lua_socket_udp_buff_send(lua_State *L);
static int ngx_http_lua_socket_udp_receive(lua_State *L);
static int ngx_http_lua_socket_udp_settimeout(lua_State *L);
static void ngx_http_lua_socket_udp_finalize(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u);
static int ngx_http_lua_socket_udp_upstream_destroy(lua_State *L);
static int ngx_http_lua_socket_resolve_retval_handler(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u, lua_State *L);
static void ngx_http_lua_socket_resolve_handler(ngx_resolver_ctx_t *ctx);
static int ngx_http_lua_socket_error_retval_handler(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u, lua_State *L);
static void ngx_http_lua_socket_udp_handle_error(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u, ngx_uint_t ft_type);
static void ngx_http_lua_socket_udp_cleanup(void *data);
static void ngx_http_lua_socket_udp_handler(ngx_event_t *ev);
static void ngx_http_lua_socket_dummy_handler(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u);
static int ngx_http_lua_socket_udp_receive_retval_handler(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u, lua_State *L);
static ngx_int_t ngx_http_lua_socket_udp_read(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u);
static void ngx_http_lua_socket_udp_read_handler(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u);
static void ngx_http_lua_socket_udp_handle_success(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u);
static ngx_int_t ngx_http_lua_udp_connect(ngx_http_lua_udp_connection_t *uc,
ngx_addr_t *local);
static int ngx_http_lua_socket_udp_close(lua_State *L);
static ngx_int_t ngx_http_lua_socket_udp_resume(ngx_http_request_t *r);
static void ngx_http_lua_udp_resolve_cleanup(void *data);
static void ngx_http_lua_udp_socket_cleanup(void *data);
static int ngx_http_lua_socket_udp_bind(lua_State *L);
enum {
SOCKET_CTX_INDEX = 1,
SOCKET_TIMEOUT_INDEX = 2,
SOCKET_BIND_INDEX = 3,
};
static char ngx_http_lua_socket_udp_metatable_key;
static char ngx_http_lua_udp_udata_metatable_key;
static u_char ngx_http_lua_socket_udp_buffer[UDP_MAX_DATAGRAM_SIZE];
void
ngx_http_lua_inject_socket_udp_api(ngx_log_t *log, lua_State *L)
{
lua_getfield(L, -1, "socket"); /* ngx socket */
lua_pushcfunction(L, ngx_http_lua_socket_udp);
lua_setfield(L, -2, "udp"); /* ngx socket */
/* udp socket object metatable */
lua_pushlightuserdata(L, ngx_http_lua_lightudata_mask(
socket_udp_metatable_key));
lua_createtable(L, 0 /* narr */, 7 /* nrec */);
lua_pushcfunction(L, ngx_http_lua_socket_udp_setpeername);
lua_setfield(L, -2, "setpeername"); /* ngx socket mt */
lua_pushcfunction(L, ngx_http_lua_socket_udp_send);
lua_setfield(L, -2, "send");
lua_pushcfunction(L, ngx_http_lua_socket_udp_buff_send);
lua_setfield(L, -2, "sendbuf");
lua_pushcfunction(L, ngx_http_lua_socket_udp_receive);
lua_setfield(L, -2, "receive");
lua_pushcfunction(L, ngx_http_lua_socket_udp_settimeout);
lua_setfield(L, -2, "settimeout"); /* ngx socket mt */
lua_pushcfunction(L, ngx_http_lua_socket_udp_close);
lua_setfield(L, -2, "close"); /* ngx socket mt */
lua_pushcfunction(L, ngx_http_lua_socket_udp_bind);
lua_setfield(L, -2, "bind");
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_rawset(L, LUA_REGISTRYINDEX);
/* }}} */
/* udp socket object metatable */
lua_pushlightuserdata(L, ngx_http_lua_lightudata_mask(
udp_udata_metatable_key));
lua_createtable(L, 0 /* narr */, 1 /* nrec */); /* metatable */
lua_pushcfunction(L, ngx_http_lua_socket_udp_upstream_destroy);
lua_setfield(L, -2, "__gc");
lua_rawset(L, LUA_REGISTRYINDEX);
/* }}} */
lua_pop(L, 1);
}
static int
ngx_http_lua_socket_udp(lua_State *L)
{
ngx_http_request_t *r;
ngx_http_lua_ctx_t *ctx;
if (lua_gettop(L) != 0) {
return luaL_error(L, "expecting zero arguments, but got %d",
lua_gettop(L));
}
r = ngx_http_lua_get_req(L);
if (r == NULL) {
return luaL_error(L, "no request found");
}
ctx = ngx_http_get_module_ctx(r, ngx_http_lua_module);
if (ctx == NULL) {
return luaL_error(L, "no ctx found");
}
ngx_http_lua_check_context(L, ctx, NGX_HTTP_LUA_CONTEXT_YIELDABLE);
lua_createtable(L, 3 /* narr */, 1 /* nrec */);
lua_pushlightuserdata(L, ngx_http_lua_lightudata_mask(
socket_udp_metatable_key));
lua_rawget(L, LUA_REGISTRYINDEX);
lua_setmetatable(L, -2);
dd("top: %d", lua_gettop(L));
return 1;
}
static int
ngx_http_lua_socket_udp_setpeername(lua_State *L)
{
ngx_http_request_t *r;
ngx_http_lua_ctx_t *ctx;
ngx_str_t host;
ngx_addr_t *local;
int port;
ngx_resolver_ctx_t *rctx, temp;
ngx_http_core_loc_conf_t *clcf;
int saved_top;
int n;
u_char *p;
size_t len;
ngx_url_t url;
ngx_int_t rc;
ngx_http_lua_loc_conf_t *llcf;
int timeout;
ngx_http_lua_co_ctx_t *coctx;
ngx_http_lua_udp_connection_t *uc;
ngx_http_lua_socket_udp_upstream_t *u;
/*
* TODO: we should probably accept an extra argument to setpeername()
* to allow the user bind the datagram unix domain socket himself,
* which is necessary for systems without autobind support.
*/
n = lua_gettop(L);
if (n != 2 && n != 3) {
return luaL_error(L, "ngx.socket.udp setpeername: expecting 2 or 3 "
"arguments (including the object), but seen %d", n);
}
r = ngx_http_lua_get_req(L);
if (r == NULL) {
return luaL_error(L, "no request found");
}
ctx = ngx_http_get_module_ctx(r, ngx_http_lua_module);
if (ctx == NULL) {
return luaL_error(L, "no ctx found");
}
ngx_http_lua_check_context(L, ctx, NGX_HTTP_LUA_CONTEXT_YIELDABLE);
luaL_checktype(L, 1, LUA_TTABLE);
p = (u_char *) luaL_checklstring(L, 2, &len);
host.data = ngx_palloc(r->pool, len + 1);
if (host.data == NULL) {
return luaL_error(L, "no memory");
}
host.len = len;
ngx_memcpy(host.data, p, len);
host.data[len] = '\0';
if (n == 3) {
port = luaL_checkinteger(L, 3);
if (port < 0 || port > 65535) {
lua_pushnil(L);
lua_pushfstring(L, "bad port number: %d", port);
return 2;
}
} else { /* n == 2 */
port = 0;
}
lua_rawgeti(L, 1, SOCKET_CTX_INDEX);
u = lua_touserdata(L, -1);
lua_pop(L, 1);
if (u) {
if (u->request && u->request != r) {
return luaL_error(L, "bad request");
}
if (u->waiting) {
lua_pushnil(L);
lua_pushliteral(L, "socket busy");
return 2;
}
if (u->udp_connection.connection) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"lua udp socket reconnect without shutting down");
ngx_http_lua_socket_udp_finalize(r, u);
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"lua reuse socket upstream ctx");
} else {
u = lua_newuserdata(L, sizeof(ngx_http_lua_socket_udp_upstream_t));
if (u == NULL) {
return luaL_error(L, "no memory");
}
#if 1
lua_pushlightuserdata(L, ngx_http_lua_lightudata_mask(
udp_udata_metatable_key));
lua_rawget(L, LUA_REGISTRYINDEX);
lua_setmetatable(L, -2);
#endif
lua_rawseti(L, 1, SOCKET_CTX_INDEX);
}
ngx_memzero(u, sizeof(ngx_http_lua_socket_udp_upstream_t));
u->request = r; /* set the controlling request */
llcf = ngx_http_get_module_loc_conf(r, ngx_http_lua_module);
u->conf = llcf;
uc = &u->udp_connection;
uc->log = *r->connection->log;
dd("lua peer connection log: %p", &uc->log);
lua_rawgeti(L, 1, SOCKET_TIMEOUT_INDEX);
timeout = (ngx_int_t) lua_tointeger(L, -1);
lua_pop(L, 1);
if (timeout > 0) {
u->read_timeout = (ngx_msec_t) timeout;
} else {
u->read_timeout = u->conf->read_timeout;
}
lua_rawgeti(L, 1, SOCKET_BIND_INDEX);
local = lua_touserdata(L, -1);
lua_pop(L, 1);
if (local != NULL) {
u->local = local;
}
ngx_memzero(&url, sizeof(ngx_url_t));
url.url.len = host.len;
url.url.data = host.data;
url.default_port = (in_port_t) port;
url.no_resolve = 1;
if (ngx_parse_url(r->pool, &url) != NGX_OK) {
lua_pushnil(L);
if (url.err) {
lua_pushfstring(L, "failed to parse host name \"%s\": %s",
host.data, url.err);
} else {
lua_pushfstring(L, "failed to parse host name \"%s\"", host.data);
}
return 2;
}
u->resolved = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_resolved_t));
if (u->resolved == NULL) {
return luaL_error(L, "no memory");
}
if (url.addrs && url.addrs[0].sockaddr) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"lua udp socket network address given directly");
u->resolved->sockaddr = url.addrs[0].sockaddr;
u->resolved->socklen = url.addrs[0].socklen;
u->resolved->naddrs = 1;
u->resolved->host = url.addrs[0].name;
} else {
u->resolved->host = host;
u->resolved->port = (in_port_t) port;
}
if (u->resolved->sockaddr) {
rc = ngx_http_lua_socket_resolve_retval_handler(r, u, L);
if (rc == NGX_AGAIN) {
return lua_yield(L, 0);
}
return rc;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
temp.name = host;
rctx = ngx_resolve_start(clcf->resolver, &temp);
if (rctx == NULL) {
u->ft_type |= NGX_HTTP_LUA_SOCKET_FT_RESOLVER;
lua_pushnil(L);
lua_pushliteral(L, "failed to start the resolver");
return 2;
}
if (rctx == NGX_NO_RESOLVER) {
u->ft_type |= NGX_HTTP_LUA_SOCKET_FT_RESOLVER;
lua_pushnil(L);
lua_pushfstring(L, "no resolver defined to resolve \"%s\"", host.data);
return 2;
}
rctx->name = host;
rctx->handler = ngx_http_lua_socket_resolve_handler;
rctx->data = u;
rctx->timeout = clcf->resolver_timeout;
u->co_ctx = ctx->cur_co_ctx;
u->resolved->ctx = rctx;
saved_top = lua_gettop(L);
coctx = ctx->cur_co_ctx;
ngx_http_lua_cleanup_pending_operation(coctx);
coctx->cleanup = ngx_http_lua_udp_resolve_cleanup;
if (ngx_resolve_name(rctx) != NGX_OK) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"lua udp socket fail to run resolver immediately");
u->ft_type |= NGX_HTTP_LUA_SOCKET_FT_RESOLVER;
u->resolved->ctx = NULL;
lua_pushnil(L);
lua_pushfstring(L, "%s could not be resolved", host.data);
return 2;
}
if (u->waiting == 1) {
/* resolved and already connecting */
return lua_yield(L, 0);
}
n = lua_gettop(L) - saved_top;
if (n) {
/* errors occurred during resolving or connecting
* or already connected */
return n;
}
/* still resolving */
u->waiting = 1;
u->prepare_retvals = ngx_http_lua_socket_resolve_retval_handler;
coctx->data = u;
if (ctx->entered_content_phase) {
r->write_event_handler = ngx_http_lua_content_wev_handler;
} else {
r->write_event_handler = ngx_http_core_run_phases;
}
return lua_yield(L, 0);
}
static void
ngx_http_lua_socket_resolve_handler(ngx_resolver_ctx_t *ctx)
{
ngx_http_request_t *r;
ngx_connection_t *c;
ngx_http_upstream_resolved_t *ur;
ngx_http_lua_ctx_t *lctx;
lua_State *L;
ngx_http_lua_socket_udp_upstream_t *u;
u_char *p;
size_t len;
socklen_t socklen;
struct sockaddr *sockaddr;
ngx_uint_t i;
unsigned waiting;
u = ctx->data;
r = u->request;
c = r->connection;
ur = u->resolved;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"lua udp socket resolve handler");
lctx = ngx_http_get_module_ctx(r, ngx_http_lua_module);
if (lctx == NULL) {
return;
}
lctx->cur_co_ctx = u->co_ctx;
u->co_ctx->cleanup = NULL;
L = lctx->cur_co_ctx->co;
dd("setting socket_ready to 1");
waiting = u->waiting;
if (ctx->state) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"lua udp socket resolver error: %s (waiting: %d)",
ngx_resolver_strerror(ctx->state), (int) u->waiting);
lua_pushnil(L);
lua_pushlstring(L, (char *) ctx->name.data, ctx->name.len);
lua_pushfstring(L, " could not be resolved (%d: %s)",
(int) ctx->state,
ngx_resolver_strerror(ctx->state));
lua_concat(L, 2);
#if 1
ngx_resolve_name_done(ctx);
ur->ctx = NULL;
#endif
u->prepare_retvals = ngx_http_lua_socket_error_retval_handler;
ngx_http_lua_socket_udp_handle_error(r, u,
NGX_HTTP_LUA_SOCKET_FT_RESOLVER);
if (waiting) {
ngx_http_run_posted_requests(c);
}
return;
}
ur->naddrs = ctx->naddrs;
ur->addrs = ctx->addrs;
#if (NGX_DEBUG)
{
u_char text[NGX_SOCKADDR_STRLEN];
ngx_str_t addr;
ngx_uint_t i;
addr.data = text;
for (i = 0; i < ctx->naddrs; i++) {
addr.len = ngx_sock_ntop(ur->addrs[i].sockaddr,
ur->addrs[i].socklen, text,
NGX_SOCKADDR_STRLEN, 0);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"name was resolved to %V", &addr);
}
}
#endif
ngx_http_lua_assert(ur->naddrs > 0);
if (ur->naddrs == 1) {
i = 0;
} else {
i = ngx_random() % ur->naddrs;
}
dd("selected addr index: %d", (int) i);
socklen = ur->addrs[i].socklen;
sockaddr = ngx_palloc(r->pool, socklen);
if (sockaddr == NULL) {
goto nomem;
}
ngx_memcpy(sockaddr, ur->addrs[i].sockaddr, socklen);
switch (sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
((struct sockaddr_in6 *) sockaddr)->sin6_port = htons(ur->port);
break;
#endif
default: /* AF_INET */
((struct sockaddr_in *) sockaddr)->sin_port = htons(ur->port);
}
p = ngx_pnalloc(r->pool, NGX_SOCKADDR_STRLEN);
if (p == NULL) {
goto nomem;
}
len = ngx_sock_ntop(sockaddr, socklen, p, NGX_SOCKADDR_STRLEN, 1);
ur->sockaddr = sockaddr;
ur->socklen = socklen;
ur->host.data = p;
ur->host.len = len;
ur->naddrs = 1;
ngx_resolve_name_done(ctx);
ur->ctx = NULL;
u->waiting = 0;
if (waiting) {
lctx->resume_handler = ngx_http_lua_socket_udp_resume;
r->write_event_handler(r);
ngx_http_run_posted_requests(c);
} else {
(void) ngx_http_lua_socket_resolve_retval_handler(r, u, L);
}
return;
nomem:
if (ur->ctx) {
ngx_resolve_name_done(ctx);
ur->ctx = NULL;
}
u->prepare_retvals = ngx_http_lua_socket_error_retval_handler;
ngx_http_lua_socket_udp_handle_error(r, u,
NGX_HTTP_LUA_SOCKET_FT_NOMEM);
if (waiting) {
ngx_http_run_posted_requests(c);
} else {
lua_pushnil(L);
lua_pushliteral(L, "no memory");
}
}
static int
ngx_http_lua_socket_resolve_retval_handler(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u, lua_State *L)
{
ngx_http_lua_ctx_t *ctx;
ngx_http_lua_co_ctx_t *coctx;
ngx_connection_t *c;
ngx_pool_cleanup_t *cln;
ngx_http_upstream_resolved_t *ur;
ngx_int_t rc;
ngx_http_lua_udp_connection_t *uc;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"lua udp socket resolve retval handler");
if (u->ft_type & NGX_HTTP_LUA_SOCKET_FT_RESOLVER) {
return 2;
}
uc = &u->udp_connection;
ur = u->resolved;
if (ur->sockaddr) {
uc->sockaddr = ur->sockaddr;
uc->socklen = ur->socklen;
uc->server = ur->host;
} else {
lua_pushnil(L);
lua_pushliteral(L, "resolver not working");
return 2;
}
rc = ngx_http_lua_udp_connect(uc, u->local);
if (rc != NGX_OK) {
u->socket_errno = ngx_socket_errno;
}
if (u->cleanup == NULL) {
cln = ngx_pool_cleanup_add(r->pool, 0);
if (cln == NULL) {
u->ft_type |= NGX_HTTP_LUA_SOCKET_FT_ERROR;
lua_pushnil(L);
lua_pushliteral(L, "no memory");
return 2;
}
cln->handler = ngx_http_lua_socket_udp_cleanup;
cln->data = u;
u->cleanup = &cln->handler;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"lua udp socket connect: %i", rc);
if (rc != NGX_OK) {
return ngx_http_lua_socket_error_retval_handler(r, u, L);
}
/* rc == NGX_OK */
c = uc->connection;
c->data = u;
c->write->handler = NULL;
c->read->handler = ngx_http_lua_socket_udp_handler;
c->read->resolver = 0;
c->pool = r->pool;
c->log = r->connection->log;
c->read->log = c->log;
c->write->log = c->log;
ctx = ngx_http_get_module_ctx(r, ngx_http_lua_module);
coctx = ctx->cur_co_ctx;
coctx->data = u;
u->read_event_handler = ngx_http_lua_socket_dummy_handler;
lua_pushinteger(L, 1);
return 1;
}
static int
ngx_http_lua_socket_error_retval_handler(ngx_http_request_t *r,
ngx_http_lua_socket_udp_upstream_t *u, lua_State *L)
{
u_char errstr[NGX_MAX_ERROR_STR];
u_char *p;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"lua udp socket error retval handler");
if (u->ft_type & NGX_HTTP_LUA_SOCKET_FT_RESOLVER) {
return 2;
}
lua_pushnil(L);
if (u->ft_type & NGX_HTTP_LUA_SOCKET_FT_PARTIALWRITE) {
lua_pushliteral(L, "partial write");
} else if (u->ft_type & NGX_HTTP_LUA_SOCKET_FT_TIMEOUT) {
lua_pushliteral(L, "timeout");
} else if (u->ft_type & NGX_HTTP_LUA_SOCKET_FT_CLOSED) {
lua_pushliteral(L, "closed");
} else if (u->ft_type & NGX_HTTP_LUA_SOCKET_FT_BUFTOOSMALL) {
lua_pushliteral(L, "buffer too small");
} else if (u->ft_type & NGX_HTTP_LUA_SOCKET_FT_NOMEM) {
lua_pushliteral(L, "no memory");
} else {
if (u->socket_errno) {
p = ngx_strerror(u->socket_errno, errstr, sizeof(errstr));
/* for compatibility with LuaSocket */
ngx_strlow(errstr, errstr, p - errstr);
lua_pushlstring(L, (char *) errstr, p - errstr);
} else {
lua_pushliteral(L, "error");
}
}
return 2;
}
static int
ngx_http_lua_socket_udp_bind(lua_State *L)
{
ngx_http_request_t *r;
ngx_http_lua_ctx_t *ctx;
int n;
u_char *text;
size_t len;
ngx_addr_t *local;
n = lua_gettop(L);
if (n != 2) {
return luaL_error(L, "expecting 2 arguments, but got %d",
lua_gettop(L));
}
r = ngx_http_lua_get_req(L);
if (r == NULL) {
return luaL_error(L, "no request found");
}
ctx = ngx_http_get_module_ctx(r, ngx_http_lua_module);
if (ctx == NULL) {
return luaL_error(L, "no ctx found");
}
ngx_http_lua_check_context(L, ctx, NGX_HTTP_LUA_CONTEXT_YIELDABLE);
luaL_checktype(L, 1, LUA_TTABLE);
text = (u_char *) luaL_checklstring(L, 2, &len);
local = ngx_http_lua_parse_addr(L, text, len);
if (local == NULL) {
lua_pushnil(L);
lua_pushfstring(L, "bad address");
return 2;
}
lua_rawseti(L, 1, SOCKET_BIND_INDEX);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"lua udp socket bind ip: %V", &local->name);
lua_pushinteger(L, 1);
return 1;
}
static int
ngx_http_lua_socket_udp_send(lua_State *L)
{
ssize_t n;
ngx_http_request_t *r;
u_char *p;
u_char *str;
size_t len;
ngx_http_lua_socket_udp_upstream_t *u;
int type;
const char *msg;
ngx_str_t query;
ngx_http_lua_loc_conf_t *llcf;
if (lua_gettop(L) != 2) {
return luaL_error(L, "expecting 2 arguments (including the object), "
"but got %d", lua_gettop(L));
}
r = ngx_http_lua_get_req(L);
if (r == NULL) {
return luaL_error(L, "request object not found");
}
luaL_checktype(L, 1, LUA_TTABLE);
lua_rawgeti(L, 1, SOCKET_CTX_INDEX);
u = lua_touserdata(L, -1);
lua_pop(L, 1);
if (u == NULL || u->udp_connection.connection == NULL) {
llcf = ngx_http_get_module_loc_conf(r, ngx_http_lua_module);
if (llcf->log_socket_errors) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"attempt to send data on a closed socket: u:%p, c:%p",
u, u ? u->udp_connection.connection : NULL);
}
lua_pushnil(L);
lua_pushliteral(L, "closed");
return 2;
}
if (u->request != r) {
return luaL_error(L, "bad request");
}
if (u->ft_type) {
u->ft_type = 0;
}
if (u->waiting) {
lua_pushnil(L);
lua_pushliteral(L, "socket busy");
return 2;
}
type = lua_type(L, 2);
switch (type) {
case LUA_TNUMBER:
len = ngx_http_lua_get_num_len(L, 2);
break;
case LUA_TSTRING:
lua_tolstring(L, 2, &len);
break;
case LUA_TTABLE:
/* The maximum possible length, not the actual length */
len = ngx_http_lua_calc_strlen_in_table(L, 2, 2, 1 /* strict */);
break;
case LUA_TNIL:
len = sizeof("nil") - 1;
break;
case LUA_TBOOLEAN:
if (lua_toboolean(L, 2)) {
len = sizeof("true") - 1;
} else {
len = sizeof("false") - 1;
}
break;
default:
msg = lua_pushfstring(L, "string, number, boolean, nil, "
"or array table expected, got %s",
lua_typename(L, type));
return luaL_argerror(L, 2, msg);
}
query.data = lua_newuserdata(L, len);
p = query.data;
switch (type) {
case LUA_TNUMBER:
p = ngx_http_lua_write_num(L, 2, p);
break;
case LUA_TSTRING:
str = (u_char *) lua_tolstring(L, 2, &len);
p = ngx_cpymem(p, (u_char *) str, len);
break;
case LUA_TTABLE:
p = ngx_http_lua_copy_str_in_table(L, 2, p);
break;
case LUA_TNIL:
*p++ = 'n';
*p++ = 'i';
*p++ = 'l';
break;
case LUA_TBOOLEAN:
if (lua_toboolean(L, 2)) {
*p++ = 't';
*p++ = 'r';
*p++ = 'u';
*p++ = 'e';
} else {
*p++ = 'f';
*p++ = 'a';
*p++ = 'l';
*p++ = 's';
*p++ = 'e';
}
break;
default:
return luaL_error(L, "impossible to reach here");
}
query.len = p - query.data;
ngx_http_lua_assert(query.len <= len);
u->ft_type = 0;
/* mimic ngx_http_upstream_init_request here */
#if 1
u->waiting = 0;
#endif
dd("sending query %.*s", (int) query.len, query.data);
n = ngx_send(u->udp_connection.connection, query.data, query.len);
dd("ngx_send returns %d (query len %d)", (int) n, (int) query.len);
if (n == NGX_ERROR || n == NGX_AGAIN) {
u->socket_errno = ngx_socket_errno;
return ngx_http_lua_socket_error_retval_handler(r, u, L);
}
if (n != (ssize_t) query.len) {
dd("not the while query was sent");
u->ft_type |= NGX_HTTP_LUA_SOCKET_FT_PARTIALWRITE;
return ngx_http_lua_socket_error_retval_handler(r, u, L);
}
dd("n == len");
lua_pushinteger(L, 1);
return 1;
}
#define stack_diff 1
static int
ngx_http_lua_socket_udp_buff_send(lua_State *L)
{
ssize_t n;
ngx_http_request_t *r;
ngx_http_lua_socket_udp_upstream_t *u;
ngx_http_lua_loc_conf_t *llcf;
// add new variable for buffer send
ngx_str_t query;
size_t size;
size_t head_len;
size_t buf_len;
u_char *msg_tmp;
const char *header_str;
const char *buff_str;
if (lua_gettop(L) < 4 ) {
return luaL_error(L, "expecting at least 4 arguments, "
"but got %d (including the object)", lua_gettop(L));
}
r = ngx_http_lua_get_req(L);
if (r == NULL) {
return luaL_error(L, "request object not found");
}
luaL_checktype(L, 1, LUA_TTABLE);
lua_rawgeti(L, 1, SOCKET_CTX_INDEX);