Nginx模块开发

来源：互联网发布：halcon去毛刺检测算法编辑：程序博客网时间：2024/06/15 09:21

转自Blog.CSDN.net/Poechant

只记录实现的细节，具体可以参看：

http://blog.csdn.net/poechant/article/details/7627828以及http://tengine.taobao.org/book/index.html

首先要明确，我们的文件和目录结构：

ngx_http_hello_world_module|_____________ngx_http_hello_world_module.c|_____________config

其中ngx_http_hello_world_module.c是模块的 C 源码文件，config是模块的配置文件。

ngx_http_hello_world_module.c

#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 argumentsstatic char* ngx_http_hello_world(ngx_conf_t* cf, ngx_command_t* cmd, void* conf);// Allocate memory for HelloWorld commandstatic void* ngx_http_hello_world_create_loc_conf(ngx_conf_t* cf);// Copy HelloWorld argument to another placestatic char* ngx_http_hello_world_merge_loc_conf(ngx_conf_t* cf, void* parent, void* child);// Structure for the HelloWorld commandstatic 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 contextstatic 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 thingngx_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

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

编写配置文件

最开始已经展示过了，就是它。

编译你的模块

$ ./configure --add-module=/your/module/path/ngx_http_hello_world_modulemake

如果没有任何错误提示的话，那么恭喜你，你的模块编译通过了！

然后运行 Nginx。如果没有任何错误提示的话，再次恭喜你，你的模块已经被正常加载运行了！

测试你的模块

http://localhost/hello_world

你应该会看到：

hello_world, Poechant

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