Nginx学习——http配置项解析编程

http配置项解析编程

配置config

ngx_addon_name=ngx_http_mytest_module

HTTP_MODULES="$HTTP_MODULES ngx_http_mytest_module"

NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_mytest_module.c"

在nginx_http_mytest_module.c中定义mytest模块，使用预设方法解析test_flag，test_str,test_num配置项，使用自己定义配置项处理方法解析mytest项。

<pre class="cpp" name="code">#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>

//create a structure
typedef struct{
        ngx_str_t my_str;
        ngx_int_t my_num;
        ngx_flag_t my_flag;
        ngx_str_t mytest_str;
        ngx_int_t mytest_num;
} ngx_http_mytest_conf_t;

static char* ngx_conf_set_mytest(ngx_conf_t* cf, ngx_command_t* cmd, void* conf);
static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t* r);

static void* ngx_http_mytest_create_loc_conf(ngx_conf_t* cf);
static char* ngx_http_mytest_merge_loc_conf(ngx_conf_t* cf, void* parent, void* child);

//set the resolution of configuration items
static ngx_command_t ngx_http_mytest_commands[] = {
        {
                //test_flag configuration item
                ngx_string("test_flag"),
                NGX_HTTP_LOC_CONF | NGX_CONF_FLAG,
                ngx_conf_set_flag_slot,
                NGX_HTTP_LOC_CONF_OFFSET,
                offsetof(ngx_http_mytest_conf_t, my_flag),
                NULL
        },
        {
                //test_str configuration item
                ngx_string("test_str"),
                NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_CONF_TAKE1,
                ngx_conf_set_str_slot,
                NGX_HTTP_LOC_CONF_OFFSET,
                offsetof(ngx_http_mytest_conf_t, my_str),
                NULL
        },
        {
                //test_num configuration item
                ngx_string("test_num"),
                NGX_HTTP_LOC_CONF | NGX_CONF_TAKE1,
                ngx_conf_set_num_slot,
                NGX_HTTP_LOC_CONF_OFFSET,
                offsetof(ngx_http_mytest_conf_t, my_num),
                NULL
        },
        {
                //mytest configuration item
                ngx_string("mytest"),
                NGX_HTTP_LOC_CONF | NGX_CONF_TAKE2,
                ngx_conf_set_mytest,
                NGX_HTTP_LOC_CONF_OFFSET,
                0,
                NULL
        },

        ngx_null_command
};
static ngx_http_module_t ngx_http_mytest_module_ctx = {
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        ngx_http_mytest_create_loc_conf,        //create location configuration
        ngx_http_mytest_merge_loc_conf          //merge the loc configurations
};

ngx_module_t ngx_http_mytest_module = {
        NGX_MODULE_V1,
        &ngx_http_mytest_module_ctx,
        ngx_http_mytest_commands,
        NGX_HTTP_MODULE,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NGX_MODULE_V1_PADDING
};

static char* ngx_conf_set_mytest(ngx_conf_t* cf, ngx_command_t* cmd, void* conf)
{
        ngx_http_mytest_conf_t* mycf = conf;

        ngx_str_t* value = cf->args->elts;

        mycf->mytest_num = ngx_atoi(value[2].data, value[2].len);

        mycf->mytest_str = value[1];
        ngx_http_core_loc_conf_t* clcf;
        clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
        clcf->handler = ngx_http_mytest_handler;

        return NGX_CONF_OK;
}

static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t* r)
{
        //we response 'GET' and 'HEAD' requests only
        if(!(r->method & (NGX_HTTP_GET | NGX_HTTP_HEAD | NGX_HTTP_POST)))
        {
                return NGX_HTTP_NOT_ALLOWED;
        }
        //discard request body, since we don't need it here
        ngx_int_t rc = ngx_http_discard_request_body(r);
        if(rc != NGX_OK){
                return rc;
        }

        ngx_http_mytest_conf_t* my_conf;
        my_conf = ngx_http_get_module_loc_conf(r, ngx_http_mytest_module);

        ngx_str_t type = ngx_string("text/plain");

        u_char nginx_str_mytest[1024] = {0};
        ngx_sprintf(nginx_str_mytest,"test_str=%s,test_flag=%i,test_num=%i,mytest_str=%s,mytest_num=%i",my_conf->my_str.data,my_conf->my_flag,my_conf->my_num,my_conf->mytest_str.data,my_conf->mytest_num);

        r->headers_out.status = NGX_HTTP_OK;
        r->headers_out.content_length_n = ngx_strlen(nginx_str_mytest);
        r->headers_out.content_type = type;

        rc = ngx_http_send_header(r);
        if(rc == NGX_ERROR || rc>NGX_OK || r->header_only)
        {
                return rc;
        }

        ngx_buf_t* b;
        b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
        if(b == NULL)
        {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }
        b->pos = nginx_str_mytest;
        b->last = nginx_str_mytest + ngx_strlen(nginx_str_mytest);
        b->memory = 1;
        b->last_buf = 1;

        ngx_chain_t out;
        out.buf = b;
        out.next = NULL;

        return ngx_http_output_filter(r, &out);
}

static void* ngx_http_mytest_create_loc_conf(ngx_conf_t* cf)
{
        ngx_http_mytest_conf_t* conf;
        conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_mytest_conf_t));
        if(NULL == conf){
                return NGX_CONF_ERROR;
        }

        conf->my_str.len = 0;
        conf->my_str.data = NULL;
        conf->my_num = NGX_CONF_UNSET;
        conf->my_flag = NGX_CONF_UNSET;
        return conf;
}

static char* ngx_http_mytest_merge_loc_conf(ngx_conf_t* cf, void* parent, void* child)
{
        ngx_http_mytest_conf_t* prev = parent;
        ngx_http_mytest_conf_t* conf = child;
        ngx_conf_merge_str_value(conf->my_str, prev->my_str,"");

        return NGX_CONF_OK;
}

在ngx.conf中http以下默认server中增加例如以下配置项

location /test{

test_flag on;

test_str "helloworld";

test_num 88;

mytest"hello" 88;

}

启动nginx

./configure --add-module=/home/chen123/nginx/exp3

make

make install

sudo /usr/local/nginx/sbin/nginx

结果例如以下