Nginx编写HTTP模块：第一个Nginx HTTP模块 “Hello World!”

写一个Nginx的http模块，当向Nginx发送请求时，Nginx返回“Hello World!”

一、代码

        文件名：ngx_http_mytest_module.c

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_http.h>

static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *r)
{
if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD)))
return NGX_HTTP_NOT_ALLOWED;

ngx_int_t rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK)
return rc;

ngx_str_t type = ngx_string("text/plain");
ngx_str_t response = ngx_string("Hello World!");

r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = response.len;
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 = ngx_create_temp_buf(r->pool, response.len);
if (b == NULL)
return NGX_HTTP_INTERNAL_SERVER_ERROR;

ngx_memcpy(b->pos, response.data, response.len);
b->last = b->pos + response.len;
b->last_buf = 1;

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

return ngx_http_output_filter(r, &out);
}

static char* ngx_http_mytest(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_mytest_handler;

return NGX_CONF_OK;
}

static ngx_command_t ngx_http_mytest_commands[] = {
{
ngx_string("mytest"),
NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | NGX_CONF_NOARGS,
ngx_http_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,
NULL,
NULL,
};

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
};

二、将代码编译进Nginx

2.1. 将代码放到Nginx源码目录下

        nginx源码目录为：/opt/nginx-1.5.4

        在/opt/nginx-1.5.4/src下新建目录mytest，将代码放到该目录下。

2.2. 在mytest目录下编写文件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"

2.3. configure时添加自定义模块的路径：

        ./configure --add-module=/opt/nginx-1.5.4/src/mytest

2.4. 编译安装nginx

        make

        make install

三、运行Nginx

Nginx默认安装到目录：/usr/local/nginx

3.1 修改配置文件

        usr/local/nginx/conf/nginx.conf



3.2 运行Nginx

        /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf

四、结果

用浏览器访问Nginx：直接输入部署Nginx的机器IP地址



参考资料：

        《深入理解Nginx：模块开发与架构解析》第三章 开发一个简单的HTTP模块

        【Nginx】开发一个简单的HTTP模块：http://www.tuicool.com/articles/aAR3uu