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ngx_http_debug_conn_module.c
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ngx_http_debug_conn_module.c
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/*
* Copyright (C) 2016 Alibaba Group Holding Limited
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#if (NGX_DEBUG_POOL)
extern size_t ngx_pool_size(ngx_pool_t *);
#else
#define ngx_pool_size(p) ((size_t) 0)
#endif
#if (NGX_HTTP_SSL)
#define ngx_request_scheme(r) ((r)->connection->ssl ? "https" : "http")
#else
#define ngx_request_scheme(r) "http"
#endif
static char *ngx_http_debug_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t ngx_http_debug_conn_buf(ngx_pool_t *pool, ngx_buf_t *b);
static ngx_command_t ngx_http_debug_conn_commands[] = {
{ ngx_string("debug_conn"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
ngx_http_debug_conn,
0,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_debug_conn_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL /* merge location configuration */
};
ngx_module_t ngx_http_debug_conn_module = {
NGX_MODULE_V1,
&ngx_http_debug_conn_module_ctx, /* module context */
ngx_http_debug_conn_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_int_t
ngx_http_debug_conn_handler(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t out;
if (r->method != NGX_HTTP_GET) {
return NGX_HTTP_NOT_ALLOWED;
}
rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK) {
return rc;
}
b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
if (b == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (ngx_http_debug_conn_buf(r->pool, b) == NGX_ERROR) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = b->last - b->pos;
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
out.buf = b;
out.next = NULL;
return ngx_http_output_filter(r, &out);
}
static ngx_int_t
ngx_http_debug_conn_buf(ngx_pool_t *pool, ngx_buf_t *b)
{
u_char *p;
size_t size;
ngx_uint_t i, k, n;
ngx_str_t addr, action, host, uri;
ngx_connection_t *c;
ngx_http_request_t *r;
#define NGX_CONN_TITLE_SIZE (sizeof(NGX_CONN_TITLE_FORMAT) - 1 + NGX_TIME_T_LEN + NGX_INT_T_LEN) /* sizeof pid_t equals time_t */
#define NGX_CONN_TITLE_FORMAT "pid:%P\n" \
"connections:%ui\n"
#define NGX_CONN_ENTRY_SIZE (sizeof(NGX_CONN_ENTRY_FORMAT) - 1 + \
NGX_SIZE_T_LEN * 2 + NGX_SOCKADDR_STRLEN + 32 /* action */ + \
NGX_OFF_T_LEN + NGX_INT_T_LEN * 3 + NGX_PTR_SIZE * 2 * 2)
#define NGX_CONN_ENTRY_FORMAT "--------- [%ui] --------\n"\
"conns[i]: %ui\n" \
" fd: %z\n" \
" addr: %V\n" \
" sent: %O\n" \
" action: %V\n" \
" handler: r:%p w:%p\n" \
"requests: %ui\n" \
"poolsize: %z\n"
#define NGX_REQ_ENTRY_SIZE (sizeof(NGX_REQ_ENTRY_FORMAT) - 1 + \
sizeof("https") - 1 + 32 /* host */ + 64 /* uri */ + \
NGX_TIME_T_LEN + NGX_PTR_SIZE * 2 * 2 + NGX_SIZE_T_LEN)
#define NGX_REQ_ENTRY_FORMAT "********* request ******\n"\
" uri: %s://%V%V\n" \
" handler: r:%p w:%p\n" \
"startsec: %T\n" \
"poolsize: %z\n"
n = ngx_cycle->connection_n - ngx_cycle->free_connection_n;
size = NGX_CONN_TITLE_SIZE + n * (NGX_CONN_ENTRY_SIZE + NGX_REQ_ENTRY_SIZE);
p = ngx_palloc(pool, size);
if (p == NULL) {
return NGX_ERROR;
}
b->pos = p;
p = ngx_sprintf(p, NGX_CONN_TITLE_FORMAT, ngx_pid, n);
/* lines of entry */
k = 0;
for (i = 0; i < ngx_cycle->connection_n; i++) {
c = &ngx_cycle->connections[i];
if (c->fd <= 0) {
continue;
}
k++;
if (n == 0) {
break;
}
n--;
/* addr_text */
if (c->addr_text.data != NULL) {
addr.data = c->addr_text.data;
addr.len = ngx_min(c->addr_text.len, NGX_SOCKADDR_STRLEN);
} else if (c->listening && c->listening->addr_text.data != NULL) {
addr.data = c->listening->addr_text.data;
addr.len = ngx_min(c->listening->addr_text.len, NGX_SOCKADDR_STRLEN);
} else {
ngx_str_set(&addr, "(null)");
}
/* action */
if (c->log->action != NULL) {
action.data = (u_char *) c->log->action;
action.len = ngx_min(ngx_strlen(c->log->action), 32);
#if (NGX_SSL)
} else if (c->ssl) {
ngx_str_set(&action, "(null: ssl)");
#endif
} else if (c->listening && c->listening->connection == c) {
ngx_str_set(&action, "(null: listening)");
} else if (c->data == NULL) {
ngx_str_set(&action, "(null: channel)");
} else {
ngx_str_set(&action, "(null)");
}
/* entry format of connection */
p = ngx_snprintf(p, NGX_CONN_ENTRY_SIZE, NGX_CONN_ENTRY_FORMAT,
k, i,
c->fd,
&addr,
c->sent,
&action,
c->read->handler, c->write->handler,
c->requests,
c->pool ? ngx_pool_size(c->pool) : (size_t) 0);
/* c->data: http request */
if (c->data != NULL) {
r = (ngx_http_request_t *) c->data;
if (r->signature == NGX_HTTP_MODULE && r->connection == c) {
/* request host */
if (r->headers_in.server.len) {
host.data = r->headers_in.server.data;
host.len = ngx_min(r->headers_in.server.len, 32);
} else {
ngx_str_set(&host, "");
}
/* request uri */
uri.data = r->unparsed_uri.data;
uri.len = ngx_min(r->unparsed_uri.len, 64);
/* entry format of request */
p = ngx_snprintf(p, NGX_REQ_ENTRY_SIZE, NGX_REQ_ENTRY_FORMAT,
ngx_request_scheme(r), &host, &uri,
r->read_event_handler, r->write_event_handler,
r->start_sec,
r->pool ? ngx_pool_size(r->pool) : (size_t) 0);
}
}
p[-1] = '\n'; /* make sure last char is newline */
}
b->last = p;
b->memory = 1;
b->last_buf = 1;
return NGX_OK;
}
static char *
ngx_http_debug_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
clcf->handler = ngx_http_debug_conn_handler;
return NGX_CONF_OK;
}