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ngx_http_netstatus_module.c
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ngx_http_netstatus_module.c
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/*
* nginx network status module
* show network connections from lsof output
*
* @author Dmitry R <[email protected]> (c) 2009
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static char *ngx_http_set_netstatus(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_command_t ngx_http_netstatus_commands[] = {
{ ngx_string("netstatus"),
NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_http_set_netstatus,
0,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_netstatus_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_netstatus_module = {
NGX_MODULE_V1,
&ngx_http_netstatus_module_ctx, /* module context */
ngx_http_netstatus_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_netstatus_handler(ngx_http_request_t *r)
{
size_t size;
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t out;
ngx_atomic_int_t ap, hn, ac, rq, rd, wr;
if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
return NGX_HTTP_NOT_ALLOWED;
}
rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK) {
return rc;
}
r->headers_out.content_type.len = sizeof("text/plain") - 1;
r->headers_out.content_type.data = (u_char *) "text/plain";
if (r->method == NGX_HTTP_HEAD) {
r->headers_out.status = NGX_HTTP_OK;
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
}
size = 100000;
b = ngx_create_temp_buf(r->pool, size);
if (b == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
out.buf = b;
out.next = NULL;
ap = *ngx_stat_accepted;
hn = *ngx_stat_handled;
ac = *ngx_stat_active;
rq = *ngx_stat_requests;
rd = *ngx_stat_reading;
wr = *ngx_stat_writing;
b->last = ngx_sprintf(b->last, CRLF "network connections: %uA (%uA, %uA, %uA)" CRLF, ac, rd, wr, ac - (rd - wr) );
b->last = ngx_sprintf(b->last, "-------------------" CRLF);
FILE * pf;
char pbuff[1024];
system("lsof -i tcp -P -n | grep nginx > /var/tmp/nginx.stats");
pf = fopen ("/var/tmp/nginx.stats" , "r");
if (pf == NULL) perror ("Error opening file");
else
{
while ((fgets(pbuff, 1023, pf)) != (char *) 0)
{
b->last = ngx_sprintf(b->last, "%s", pbuff);
}
fclose (pf);
}
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = b->last - b->pos;
b->last_buf = 1;
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
return ngx_http_output_filter(r, &out);
}
static char *ngx_http_set_netstatus(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_netstatus_handler;
return NGX_CONF_OK;
}