nginx模块开发初体验

一、先来看看我们想要达到的结果

二、自定义模块首先安装好nginx，再来修改配置文件nginx.conf

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
        }

        #加入这一段，输入后缀/hello_world是就会调用我们自定义的模块
        location /hello_world {
            hello_world Poechant;
        }

    }

然后创建一个目录写自定义的模块

mkdir ngx_http_hello_world_module
cd ngx_http_hello_world_module
touch ngx_http_hello_world_module.c
touch config

这就是我们的目录结构

• ngx_http_hello_world_module.c文件内容

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

typedef struct {
    ngx_str_t output_words;
} ngx_http_hello_world_loc_conf_t;

// To process HelloWorld command arguments
static char* ngx_http_hello_world(ngx_conf_t* cf, ngx_command_t* cmd, void* conf);

// Allocate memory for HelloWorld command
static void* ngx_http_hello_world_create_loc_conf(ngx_conf_t* cf);

// Copy HelloWorld argument to another place
static char* ngx_http_hello_world_merge_loc_conf(ngx_conf_t* cf, void* parent, void* child);

// Structure for the HelloWorld command
static ngx_command_t ngx_http_hello_world_commands[] = {
    {
        ngx_string("hello_world"), // The command name
        NGX_HTTP_LOC_CONF | NGX_CONF_TAKE1,
        ngx_http_hello_world, // The command handler
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_hello_world_loc_conf_t, output_words),
        NULL
    },
    ngx_null_command
};

// Structure for the HelloWorld context
static ngx_http_module_t ngx_http_hello_world_module_ctx = {
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    ngx_http_hello_world_create_loc_conf,
    ngx_http_hello_world_merge_loc_conf
};

// Structure for the HelloWorld module, the most important thing
ngx_module_t ngx_http_hello_world_module = {
    NGX_MODULE_V1,
    &ngx_http_hello_world_module_ctx,
    ngx_http_hello_world_commands,
    NGX_HTTP_MODULE,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NGX_MODULE_V1_PADDING
};

static ngx_int_t ngx_http_hello_world_handler(ngx_http_request_t* r) {
    ngx_int_t rc;
    ngx_buf_t* b;
    ngx_chain_t out[2];

    ngx_http_hello_world_loc_conf_t* hlcf;
    hlcf = ngx_http_get_module_loc_conf(r, ngx_http_hello_world_module);

    r->headers_out.content_type.len = sizeof("text/plain") - 1;
    r->headers_out.content_type.data = (u_char*)"text/plain";

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

    out[0].buf = b;
    out[0].next = &out[1];

    b->pos = (u_char*)"hello_world, ";
    b->last = b->pos + sizeof("hello_world, ") - 1;
    b->memory = 1;

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

    out[1].buf = b;
    out[1].next = NULL;

    b->pos = hlcf->output_words.data;
    b->last = hlcf->output_words.data + (hlcf->output_words.len);
    b->memory = 1;
    b->last_buf = 1;

    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.content_length_n = hlcf->output_words.len + sizeof("hello_world, ") - 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[0]);
}

static void* ngx_http_hello_world_create_loc_conf(ngx_conf_t* cf) {
    ngx_http_hello_world_loc_conf_t* conf;

    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_hello_world_loc_conf_t));
    if (conf == NULL) {
        return NGX_CONF_ERROR;
    }
    conf->output_words.len = 0;
    conf->output_words.data = NULL;

    return conf;
}

static char* ngx_http_hello_world_merge_loc_conf(ngx_conf_t* cf, void* parent, void* child) {
    ngx_http_hello_world_loc_conf_t* prev = parent;
    ngx_http_hello_world_loc_conf_t* conf = child;
    ngx_conf_merge_str_value(conf->output_words, prev->output_words, "Nginx");
    return NGX_CONF_OK;
}

static char* ngx_http_hello_world(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_hello_world_handler;
    ngx_conf_set_str_slot(cf, cmd, conf);
    return NGX_CONF_OK;
}

• config文件内容

ngx_addon_name=ngx_http_hello_world_module
HTTP_MODULES="$HTTP_MODULES ngx_http_hello_world_module"
NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_hello_world_module.c"

三、开始编译安装

• 到nginx安装包目录下重新编译自定义的模块–add-module路径填你自定义模块的位置

./configure --prefix=/usr/local/nginx --add-module=/home/zzq/software/ngx_http_hello_world_module

- 编译是会有提示的，会提示你新增了哪些模块,然后

make
make install

一切执行完后,没报错一般都是成功了的,然后重启nginx,就可以输入http://你的ip:port/hello_world测试下。