#include <ngx_config.h>

#include <ngx_core.h>

#include <ngx_http.h>

typedef struct

{

ngx_str_t hello_string;

ngx_int_t hello_counter;

}ngx_http_hello_loc_conf_t;

static ngx_int_t ngx_http_hello_init(ngx_conf_t *cf);

static void *ngx_http_hello_create_loc_conf(ngx_conf_t *cf);

static char *ngx_http_hello_string(ngx_conf_t *cf, ngx_command_t *cmd,

void *conf);

static char *ngx_http_hello_counter(ngx_conf_t *cf, ngx_command_t *cmd,

void *conf);

static ngx_command_t ngx_http_hello_commands[] = {

{

ngx_string("hello_string"),

NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS|NGX_CONF_TAKE1,

ngx_http_hello_string,

NGX_HTTP_LOC_CONF_OFFSET,

offsetof(ngx_http_hello_loc_conf_t, hello_string),

NULL },

{

ngx_string("hello_counter"),

NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,

ngx_http_hello_counter,

NGX_HTTP_LOC_CONF_OFFSET,

offsetof(ngx_http_hello_loc_conf_t, hello_counter),

NULL },

ngx_null_command

};

/*

static u_char ngx_hello_default_string[] = "Default String: Hello, world!";

*/

static int ngx_hello_visited_times = 0;

static ngx_http_module_t ngx_http_hello_module_ctx = {

NULL, /* preconfiguration */

ngx_http_hello_init, /* postconfiguration */

NULL, /* create main configuration */

NULL, /* init main configuration */

NULL, /* create server configuration */

NULL, /* merge server configuration */

ngx_http_hello_create_loc_conf, /* create location configuration */

NULL /* merge location configuration */

};

ngx_module_t ngx_http_hello_module = {

NGX_MODULE_V1,

&ngx_http_hello_module_ctx, /* module context */

ngx_http_hello_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_hello_handler(ngx_http_request_t *r)

{

ngx_int_t rc;

ngx_buf_t *b;

ngx_chain_t out;

ngx_http_hello_loc_conf_t* my_conf;

u_char ngx_hello_string[1024] = {0};

ngx_uint_t content_length = 0;

ngx_log_error(NGX_LOG_EMERG, r->connection->log, 0, "ngx_http_hello_handler is called!");

my_conf = ngx_http_get_module_loc_conf(r, ngx_http_hello_module);

if (my_conf->hello_string.len == 0 )

{

ngx_log_error(NGX_LOG_EMERG, r->connection->log, 0, "hello_string is empty!");

return NGX_DECLINED;

}

if (my_conf->hello_counter == NGX_CONF_UNSET

|| my_conf->hello_counter == 0)

{

ngx_sprintf(ngx_hello_string, "%s", my_conf->hello_string.data);

}

else

{

ngx_sprintf(ngx_hello_string, "%s Visited Times:%d", my_conf->hello_string.data,

++ngx_hello_visited_times);

}

ngx_log_error(NGX_LOG_EMERG, r->connection->log, 0, "hello_string:%s", ngx_hello_string);

content_length = ngx_strlen(ngx_hello_string);

/* 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";

*/

ngx_str_set(&r->headers_out.content_type, "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;

return ngx_http_send_header(r);

}

/* allocate a buffer for your response body */

b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));

if (b == NULL) {

return NGX_HTTP_INTERNAL_SERVER_ERROR;

}

/* attach this buffer to the buffer chain */

out.buf = b;

out.next = NULL;

/* adjust the pointers of the buffer */

b->pos = ngx_hello_string;

b->last = ngx_hello_string + content_length;

b->memory = 1; /* this buffer is in memory */

b->last_buf = 1; /* this is the last buffer in the buffer chain */

/* set the status line */

r->headers_out.status = NGX_HTTP_OK;

r->headers_out.content_length_n = content_length;

/* send the headers of your response */

rc = ngx_http_send_header(r);

if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {

return rc;

}

/* send the buffer chain of your response */

return ngx_http_output_filter(r, &out);

}

static void *ngx_http_hello_create_loc_conf(ngx_conf_t *cf)

{

ngx_http_hello_loc_conf_t* local_conf = NULL;

local_conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_hello_loc_conf_t));

if (local_conf == NULL)

{

return NULL;

}

ngx_str_null(&local_conf->hello_string);

local_conf->hello_counter = NGX_CONF_UNSET;

return local_conf;

}

/*

static char *ngx_http_hello_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)

{

ngx_http_hello_loc_conf_t* prev = parent;

ngx_http_hello_loc_conf_t* conf = child;

ngx_conf_merge_str_value(conf->hello_string, prev->hello_string, ngx_hello_default_string);

ngx_conf_merge_value(conf->hello_counter, prev->hello_counter, 0);

return NGX_CONF_OK;

}*/

static char *

ngx_http_hello_string(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)

{

ngx_http_hello_loc_conf_t* local_conf;

local_conf = conf;

char* rv = ngx_conf_set_str_slot(cf, cmd, conf);

ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "hello_string:%s", local_conf->hello_string.data);

return rv;

}

static char *ngx_http_hello_counter(ngx_conf_t *cf, ngx_command_t *cmd,

void *conf)

{

ngx_http_hello_loc_conf_t* local_conf;

local_conf = conf;

char* rv = NULL;

rv = ngx_conf_set_flag_slot(cf, cmd, conf);

ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "hello_counter:%d", local_conf->hello_counter);

return rv;

}

static ngx_int_t

ngx_http_hello_init(ngx_conf_t *cf)

{

ngx_http_handler_pt *h;

ngx_http_core_main_conf_t *cmcf;

cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);

h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);

if (h == NULL) {

return NGX_ERROR;

}

*h = ngx_http_hello_handler;

return NGX_OK;

}