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lighttpd2/src/modules/mod_debug.c

341 lines
10 KiB

/*
* mod_debug - utilities to debug lighttpd
*
* Description:
* mod_debug offers various utilities to aid you debug a problem.
*
* Setups:
* none
* Options:
* none
* Actions:
* debug.show_connections;
* - shows a page similar to the one from mod_status, listing all active connections
* - by specifying one or more "connection ids" via querystring (parameter "con"),
* one can request additional debug output for specific connections
*
* Example config:
* if req.path == "/debug/connections" { debug.show_connections; }
*
* Tip:
* none
*
* Todo:
* - prettier output
* - more detailed output
* - more debug actions (for other stuff than connections)
*
* Author:
* Copyright (c) 2009 Thomas Porzelt
* License:
* MIT, see COPYING file in the lighttpd 2 tree
*/
#include <lighttpd/base.h>
LI_API gboolean mod_debug_init(liModules *mods, liModule *mod);
LI_API gboolean mod_debug_free(liModules *mods, liModule *mod);
struct mod_debug_detailed_t {
liConnection con;
};
typedef struct mod_debug_detailed_t mod_debug_detailed_t;
struct mod_debug_data_t {
guint wrk_ndx;
guint con_ndx;
liConnection *con;
liWaitQueueElem io_timeout_elem;
gint fd;
liConnectionState state;
GString *remote_addr_str, *local_addr_str;
gboolean is_ssl, keep_alive;
GString *host, *path, *query;
liHttpMethod method;
goffset request_size;
goffset response_size;
ev_tstamp ts;
guint64 bytes_in;
guint64 bytes_out;
guint64 bytes_in_5s_diff;
guint64 bytes_out_5s_diff;
GString *detailed;
};
typedef struct mod_debug_data_t mod_debug_data_t;
struct mod_debug_job_t {
liVRequest *vr;
gpointer *context;
liPlugin *p;
struct {
guint wrk_ndx;
guint con_ndx;
gint fd;
GString *remote_addr_str;
} detailed;
};
typedef struct mod_debug_job_t mod_debug_job_t;
/* the CollectFunc */
static gpointer debug_collect_func(liWorker *wrk, gpointer fdata) {
GArray *cons;
mod_debug_job_t *job = fdata;
/* gather connection info */
cons = g_array_sized_new(FALSE, TRUE, sizeof(mod_debug_data_t), wrk->connections_active);
g_array_set_size(cons, wrk->connections_active);
for (guint i = 0; i < wrk->connections_active; i++) {
liConnection *c = g_array_index(wrk->connections, liConnection*, i);
mod_debug_data_t *cd = &g_array_index(cons, mod_debug_data_t, i);
cd->wrk_ndx = wrk->ndx;
cd->con_ndx = i;
cd->con = c;
cd->io_timeout_elem = c->io_timeout_elem;
cd->fd = c->sock_watcher.fd;
cd->is_ssl = c->is_ssl;
cd->keep_alive = c->keep_alive;
cd->remote_addr_str = g_string_new_len(GSTR_LEN(c->remote_addr_str));
cd->local_addr_str = g_string_new_len(GSTR_LEN(c->srv_sock->local_addr_str));
cd->host = g_string_new_len(GSTR_LEN(c->mainvr->request.uri.host));
cd->path = g_string_new_len(GSTR_LEN(c->mainvr->request.uri.path));
cd->query = g_string_new_len(GSTR_LEN(c->mainvr->request.uri.query));
cd->method = c->mainvr->request.http_method;
cd->request_size = c->mainvr->request.content_length;
cd->response_size = c->mainvr->out->bytes_out;
cd->state = c->state;
cd->ts = c->ts;
cd->bytes_in = c->stats.bytes_in;
cd->bytes_out = c->stats.bytes_out;
cd->bytes_in_5s_diff = c->stats.bytes_in_5s_diff;
cd->bytes_out_5s_diff = c->stats.bytes_out_5s_diff;
if (job->detailed.remote_addr_str) {
if (job->detailed.wrk_ndx == wrk->ndx && job->detailed.con_ndx == i &&
job->detailed.fd == c->sock_watcher.fd && g_string_equal(job->detailed.remote_addr_str, c->remote_addr_str)) {
cd->detailed = g_string_sized_new(1023);
g_string_append_printf(cd->detailed, "<pre>connection* @ %p = {\n", (void*)cd->con);
g_string_append_printf(cd->detailed, " remote_addr_str = \"%s\",\n", cd->remote_addr_str->str);
g_string_append_printf(cd->detailed, " local_addr_str = \"%s\",\n", cd->local_addr_str->str);
g_string_append_printf(cd->detailed, " fd = %d,\n", cd->fd);
g_string_append_printf(cd->detailed, " state = \"%s\",\n", li_connection_state_str(cd->state));
g_string_append_printf(cd->detailed, " ts = %f,\n", cd->ts);
g_string_append_printf(cd->detailed,
" io_timeout_elem = {\n"
" queued = %s,\n"
" ts = %f,\n"
" prev = %p,\n"
" next = %p,\n"
" data = %p,\n"
" }\n",
cd->io_timeout_elem.queued ? "true":"false",
cd->io_timeout_elem.ts,
(void*)cd->io_timeout_elem.prev, (void*)cd->io_timeout_elem.next,
cd->io_timeout_elem.data
);
g_string_append_printf(cd->detailed,
" stats = {\n"
" bytes_in = %"G_GUINT64_FORMAT",\n"
" bytes_out = %"G_GUINT64_FORMAT"\n"
" }\n",
cd->bytes_in, cd->bytes_out
);
g_string_append_len(cd->detailed, CONST_STR_LEN("}</pre>"));
}
}
}
return cons;
}
/* the CollectCallback */
static void debug_collect_cb(gpointer cbdata, gpointer fdata, GPtrArray *result, gboolean complete) {
mod_debug_job_t *job = cbdata;
liVRequest *vr;
GString *html;
UNUSED(fdata);
if (!complete) {
/* someone called li_collect_break, so we don't need any vrequest handling here. just free the result data */
guint i, j;
for (i = 0; i < result->len; i++) {
GArray *cons = g_ptr_array_index(result, i);
for (j = 0; j < cons->len; j++) {
mod_debug_data_t *cd = &g_array_index(cons, mod_debug_data_t, j);
g_string_free(cd->remote_addr_str, TRUE);
g_string_free(cd->local_addr_str, TRUE);
g_string_free(cd->host, TRUE);
g_string_free(cd->path, TRUE);
g_string_free(cd->query, TRUE);
if (cd->detailed)
g_string_free(cd->detailed, TRUE);
}
g_array_free(cons, TRUE);
}
if (job->detailed.remote_addr_str)
g_string_free(job->detailed.remote_addr_str, TRUE);
g_slice_free(mod_debug_job_t, job);
return;
}
vr = job->vr;
/* clear context so it doesn't get cleaned up anymore */
*(job->context) = NULL;
html = g_string_sized_new(2047);
g_string_append_len(html, CONST_STR_LEN("<html>\n<head>\n<title>Lighttpd mod_debug</title>\n"
"<style>a { color: blue; }</style>\n"
"</head>\n<body>\n"));
/* list connections */
{
guint i, j;
GString *duration = g_string_sized_new(15);
g_string_append_printf(html, "<p>now: %f<br>io timeout watcher active/repeat: %s/%f<br></p>\n",
CUR_TS(vr->wrk), ev_is_active(&(vr->wrk->io_timeout_queue.timer)) ? "yes":"no",
vr->wrk->io_timeout_queue.timer.repeat
);
g_string_append_len(html, CONST_STR_LEN("<table><tr><th>Client</th><th>Duration</th><th></th></tr>\n"));
for (i = 0; i < result->len; i++) {
GArray *cons = g_ptr_array_index(result, i);
for (j = 0; j < cons->len; j++) {
mod_debug_data_t *d = &g_array_index(cons, mod_debug_data_t, j);
li_counter_format((guint64)(CUR_TS(vr->wrk) - d->ts), COUNTER_TIME, duration);
g_string_append_printf(html, "<tr><td>%s</td><td style=\"text-align:right;\">%s</td><td style=\"padding-left:10px;\"><a href=\"?%u_%u_%d_%s\">debug</a></td></tr>\n",
d->remote_addr_str->str,
duration->str,
d->wrk_ndx, d->con_ndx, d->fd, d->remote_addr_str->str
);
if (d->detailed) {
g_string_append_printf(html, "<tr><td colspan=\"3\">%s</td></tr>\n", d->detailed->str);
g_string_free(d->detailed, TRUE);
}
g_string_free(d->remote_addr_str, TRUE);
g_string_free(d->local_addr_str, TRUE);
g_string_free(d->host, TRUE);
g_string_free(d->path, TRUE);
g_string_free(d->query, TRUE);
}
g_array_free(cons, TRUE);
}
g_string_append_len(html, CONST_STR_LEN("</table>\n"));
g_string_free(duration, TRUE);
}
g_string_append_len(html, CONST_STR_LEN("</body>\n</html>\n"));
li_chunkqueue_append_string(vr->out, html);
li_http_header_overwrite(vr->response.headers, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("text/html"));
vr->response.http_status = 200;
li_vrequest_joblist_append(vr);
if (job->detailed.remote_addr_str)
g_string_free(job->detailed.remote_addr_str, TRUE);
g_slice_free(mod_debug_job_t, job);
}
static liHandlerResult debug_show_connections_cleanup(liVRequest *vr, gpointer param, gpointer context) {
liCollectInfo *ci = (liCollectInfo*) context;
UNUSED(vr);
UNUSED(param);
li_collect_break(ci);
return LI_HANDLER_GO_ON;
}
static liHandlerResult debug_show_connections(liVRequest *vr, gpointer param, gpointer *context) {
if (li_vrequest_handle_direct(vr)) {
liCollectInfo *ci;
mod_debug_job_t *j = g_slice_new0(mod_debug_job_t);
j->vr = vr;
j->context = context;
j->p = (liPlugin*) param;
if (vr->request.uri.query->len) {
/* querystring = <wrk_ndx>_<con_ndx>_<con_fd>_<remote_addr_str> */
j->detailed.remote_addr_str = g_string_sized_new(vr->request.uri.query->len);
sscanf(vr->request.uri.query->str, "%u_%u_%i_%s", &(j->detailed.wrk_ndx),
&(j->detailed.con_ndx), &(j->detailed.fd), j->detailed.remote_addr_str->str);
g_string_set_size(j->detailed.remote_addr_str, strlen(j->detailed.remote_addr_str->str));
}
VR_DEBUG(vr, "%s", "collecting debug info...");
ci = li_collect_start(vr->wrk, debug_collect_func, j, debug_collect_cb, j);
*context = ci; /* may be NULL */
}
return (*context) ? LI_HANDLER_WAIT_FOR_EVENT : LI_HANDLER_GO_ON;
}
static liAction* debug_show_connections_create(liServer *srv, liPlugin* p, liValue *val) {
UNUSED(srv); UNUSED(p);
if (val) {
ERROR(srv, "%s", "debug.show_connections doesn't expect any parameters");
return NULL;
}
return li_action_new_function(debug_show_connections, debug_show_connections_cleanup, NULL, p);
}
static const liPluginOption options[] = {
{ NULL, 0, NULL, NULL, NULL }
};
static const liPluginAction actions[] = {
{ "debug.show_connections", debug_show_connections_create },
{ NULL, NULL }
};
static const liliPluginSetupCB setups[] = {
{ NULL, NULL }
};
static void plugin_debug_init(liServer *srv, liPlugin *p) {
UNUSED(srv);
p->options = options;
p->actions = actions;
p->setups = setups;
}
gboolean mod_debug_init(liModules *mods, liModule *mod) {
UNUSED(mod);
MODULE_VERSION_CHECK(mods);
mod->config = li_plugin_register(mods->main, "mod_debug", plugin_debug_init);
return mod->config != NULL;
}
gboolean mod_debug_free(liModules *mods, liModule *mod) {
if (mod->config)
li_plugin_free(mods->main, mod->config);
return TRUE;
}