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http module handler, chain buffer and output_filter

December 29, 2014 11:11PM
Hey, i wonder why the server is freezing when i do a request to it and i do not define the "NO_PROBLEM" macro in the code.
In my ngx_html_chain_buffers_init i do a ngx_pcalloc because i thought that the server was freezing because of some memory missing alignment(it was firstly static). I am just too tired at this hour for change it(ill change it tommorow).

I am on a debian jessie,
nginx 1.6.2 (source from the debian repo if i remember well)

PS: I am sorry if i miss some forum rules. It is my first time here. Just tell me what i did wrong if i did something wrong.
Thank You !
here is my code:

//#define NO_PROBLEM

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <stdio.h>
/* BEGIN html strings */
enum ngx_html_text_e {
NGX_HTML_ALL,
NGX_HTML_NB_PARTS
};

static ngx_str_t ngx_html_strings[NGX_HTML_NB_PARTS] = {
ngx_string(
"<!DOCTYPE html>\n"
"<html>\n"
"\t<head>\n"
"\t</head>\n"
"\t<body>\n"
"\t</body>\n"
"</html>"
)
};
/* END html strings */
static ngx_buf_t * ngx_html_buffers;
static ngx_chain_t ngx_html_chain_buffers[NGX_HTML_NB_PARTS];
static ngx_pool_t * ngx_html_buffers_pool;

static char *
ngx_html_chain_buffers_init(ngx_log_t *log){
ngx_int_t i;
ngx_html_buffers_pool = ngx_create_pool(NGX_HTML_NB_PARTS * sizeof(ngx_buf_t) + sizeof(ngx_pool_t), log);
//TODO TMP ALLOC
ngx_html_buffers = ngx_pcalloc(ngx_html_buffers_pool, NGX_HTML_NB_PARTS * sizeof(ngx_buf_t));
if(ngx_html_buffers == NULL){
return NGX_CONF_ERROR;
}
for(i = 0;i < NGX_HTML_NB_PARTS;i++){

ngx_html_buffers[i].pos = ngx_html_strings[i].data;
ngx_html_buffers[i].last = ngx_html_strings[i].data +
ngx_html_strings[i].len;
ngx_html_buffers[i].file_pos = 0;
ngx_html_buffers[i].file_last = 0;
ngx_html_buffers[i].start = NULL;
ngx_html_buffers[i].end = NULL;
ngx_html_buffers[i].tag = NULL;
ngx_html_buffers[i].file = NULL;
ngx_html_buffers[i].shadow = NULL;
ngx_html_buffers[i].temporary = 0;
ngx_html_buffers[i].memory = 1;
ngx_html_buffers[i].mmap = 0;
ngx_html_buffers[i].recycled = 0;
ngx_html_buffers[i].in_file = 0;
ngx_html_buffers[i].flush = 0;
ngx_html_buffers[i].sync = 0;
ngx_html_buffers[i].last_buf = 0;
ngx_html_buffers[i].last_in_chain = 0;
ngx_html_buffers[i].last_shadow = 0;
ngx_html_buffers[i].temp_file = 0;
ngx_html_buffers[i].num = 0;

ngx_html_chain_buffers[i].buf = &ngx_html_buffers[i];
}
ngx_html_buffers[i].last_buf = 1;
ngx_html_buffers[i].last_in_chain = 1;
return NGX_CONF_OK;
}

static char * ngx_http_diceroll_quickcrab_com(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);

static ngx_command_t ngx_http_diceroll_quickcrab_com_commands[] = {
{
ngx_string("diceroll_quickcrab_com"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
ngx_http_diceroll_quickcrab_com,
0,
0,
NULL
},
ngx_null_command
};

/*
* The module context has hooks , here we have a hook for creating
* location configuration
*/
static ngx_http_module_t ngx_http_diceroll_quickcrab_com_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 */
};
/*
* The module which binds the context and commands
*/
ngx_module_t ngx_http_diceroll_quickcrab_com_module = {
NGX_MODULE_V1,
&ngx_http_diceroll_quickcrab_com_module_ctx, /* module context */
ngx_http_diceroll_quickcrab_com_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
};
/*
* Main handler function of the module.
*/
static ngx_int_t
ngx_http_diceroll_quickcrab_com_handler(ngx_http_request_t *r){
ngx_int_t rc;
size_t content_length_n;
ngx_chain_t * out;
content_length_n = 0;
out = &ngx_html_chain_buffers[NGX_HTML_ALL];
out->next = NULL;
#ifdef NO_PROBLEM
out->buf = ngx_pcalloc(r->pool,sizeof(ngx_buf_t));
out->buf->pos = ngx_html_strings[NGX_HTML_ALL].data;
out->buf->last = ngx_html_strings[NGX_HTML_ALL].data +
ngx_html_strings[NGX_HTML_ALL].len;
out->buf->memory = 1;
out->buf->last_buf = 1;
#endif
content_length_n += ngx_html_strings[NGX_HTML_ALL].len;

/* we response to 'GET' and 'HEAD' requests only */
if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) {
return NGX_HTTP_NOT_ALLOWED;
}
/* discard request body, since we don't need it here */
rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK) {
return rc;
}
/* set the 'Content-type' header */
r->headers_out.content_type_len = sizeof("text/html") - 1;
r->headers_out.content_type.data = (u_char *) "text/html";
/* send the header only, if the request type is http 'HEAD' */
if (r->method == NGX_HTTP_HEAD) {
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = content_length_n;
return ngx_http_send_header(r);
}

/* set the status line */
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = content_length_n;
/* send the headers of your response */
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "------------------------------------------------");
/* send the buffer chain of your response */
rc = ngx_http_output_filter(r, out);
return rc;
}
/*
* Function for the directive diceroll_quickcrab_com , it validates its value
* and copies it to a static variable to be printed later
*/
static char *
ngx_http_diceroll_quickcrab_com(ngx_conf_t *cf, ngx_command_t *cmd, void *conf){
char * rc;
ngx_http_core_loc_conf_t *clcf;
static unsigned already_done = 0;

if(!already_done) {
rc = ngx_html_chain_buffers_init(cf->log);
if (rc != NGX_CONF_OK) return rc;
already_done = 1;
}

clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
clcf->handler = ngx_http_diceroll_quickcrab_com_handler;

return NGX_CONF_OK;
}



Here is my nginx.conf:
worker_processes 1;
error_log logs/debug.log debug;
events {
worker_connections 4;
}
http {
server_names_hash_max_size 4;
server_names_hash_bucket_size 4;
server {
listen 127.0.0.1:80 default_server;
server_name _;
return 444;
}
server {
listen 127.0.0.1:80;
server_name localhost 127.0.0.1;
root /var/www/diceroll.quickcrab.com;
location / {
diceroll_quickcrab_com;
}
}
}

Thank you
Subject Author Posted

http module handler, chain buffer and output_filter

xdiaod December 29, 2014 11:11PM

Re: http module handler, chain buffer and output_filter

xdiaod December 29, 2014 11:18PM

Re: http module handler, chain buffer and output_filter

xdiaod January 01, 2015 03:56PM

Re: http module handler, chain buffer and output_filter

xdiaod January 01, 2015 04:00PM

Re: http module handler, chain buffer and output_filter

xdiaod January 01, 2015 08:54PM



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