1. nginx添加自定义http模块(简单)

mkdir /opt/nginx/ext/hello_world/

vim /opt/nginx/ext/hello_world/config# 添加如下内容ngx_addon_name=ngx_http_hello_world_moduleHTTP_MODULES="$HTTP_MODULES ngx_http_hello_world_module"NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_hello_world_module.c"CORE_LIBS="$CORE_LIBS -lpcre"# ngx_addon_name 表示模块名称# HTTP_MODULES 表示定义HTTP_MODULES模块，多个模块以空格分开，为了不覆盖之前的模块，使用$HTTP_MODULES代表已经存在的# NGX_ADDON_SRCS 代表模块代码路径# CORE_LIBS 代表模块需要的库文件　

static ngx_command_t ngx_http_hello_world_commands[] = { ??{ ???ngx_string("hello_world"), ???NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | \ ??????NGX_CONF_NOARGS, ???ngx_http_hello_world, ???NGX_HTTP_LOC_CONF_OFFSET, ???0, ?????NULL ?}, ???ngx_null_command};// hello_world: 这个与nginx.conf中定义的location中的名字一致// ?NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | NGX_CONF_NOARGS： 指定出现的位置，可以出现在location {}中// nginx_http_hello_world: 这个ngx_command_t中的set成员，当某块位置出现hello_world时候，nginx将会启动ngx_http_hello_world方法，所以需要定义该函数static ngx_http_module_t ngx_http_hello_world_module_ctx = { ??NULL, ?/* preconfiguration */ ?NULL, ?/* postconfiguration */ ?NULL, ?/* create main configuration */ ?NULL, ?/* init main configuration */ ?NULL, ?/* create server configuration */ ?NULL, ?/* merge server configuration */ ?NULL, ?/* create location configuration */ ?NULL ??/* merge location configuration */};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};// NGX_MODULE_V1 代表版本号// ngx_http_hello_world_module_ctx 代表模块上下文结构，HTTP框架要求，固定用法// ngx_http_hello_world_commands 代表模块的配置文件参数，这个在nginx.conf文件解析// NGX_HTTP_MODULE 代表这是一个http模块

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; ???return NGX_CONF_OK;}// ngx_http_conf_get_module_loc_conf: 这个函数会首先找到hello_world配置所属的配置块// handler: http框架在处理用户请求进行到NGX_HTTP_CONTENT_PHASE阶段，如果请求的主机域名，URL和hello_world相匹配，那么就调用这handler指向的方法ngx_http_hello_world_handler

static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *r){ ???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);//发送头部 ???if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { ???????return rc; ???} ???ngx_buf_t *b; ???b = ngx_create_temp_buf(r->pool, response.len);//异步发送，要用堆内存空间 ???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);//向用户发送响应包}

#include <ngx_config.h>#include <ngx_core.h>#include <ngx_http.h>static ngx_int_t ngx_http_hello_world_handler(ngx_http_request_t *r);static char* ngx_http_hello_world(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);static ngx_command_t ngx_http_hello_world_commands[] = {{ ???ngx_string("hello_world"), ???NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | ????NGX_CONF_NOARGS, ???ngx_http_hello_world, ???NGX_HTTP_LOC_CONF_OFFSET, ???0, ???NULL ???}, ???ngx_null_command};static ngx_http_module_t ngx_http_hello_world_module_ctx = { ???NULL, ???NULL, ???NULL, ???NULL, ???NULL, ???NULL, ???NULL, ???NULL};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 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; ???return NGX_CONF_OK;}static ngx_int_t ngx_http_hello_world_handler(ngx_http_request_t *r) { ???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; ???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);}

vim /etc/nginx添加 location / {hello_world};server {...location / { ??????????hello_world; ???????} ???????????...}

./configure --add-module=/opt/nginx/ext/hello_world/make && make install

/usr/local/nginx/sbin/nginxcurl http://localhost