Nginx模块开发 研究1
不同的模块流程不同这是一个直接从从配置中读取信息，并返回给客户端的例子。#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static char* ngx_echo_readconf(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static void* ngx_echo_create_loc_conf(ngx_conf_t *cf);
static char* ngx_echo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child);
typedef struct {
ngx_str_t ecdata;
ngx_flag_t enable;
} ngx_echo_loc_conf_t;
// 读取配置文件内容 echo -> ecdata
// 1、ngx_echo_readconf是程序第一步
static ngx_command_t ngx_echo_commands[] = {
{ ngx_string("echo"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_echo_readconf,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_echo_loc_conf_t, ecdata),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_echo_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_echo_create_loc_conf, /* create location configuration */
ngx_echo_merge_loc_conf /* merge location configuration */
};
// 定义模块 ngx_http_hi_module 就是模块的名字
ngx_module_t ngx_http_hi_module = {
NGX_MODULE_V1,
&ngx_echo_module_ctx, /* module context */
ngx_echo_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
// 主要的功能在这里
static ngx_int_t
ngx_echo_handler(ngx_http_request_t *r)
{
printf("called:ngx_echo_handler\n");
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t out;
ngx_echo_loc_conf_t *cglcf;
cglcf = ngx_http_get_module_loc_conf(r, ngx_http_hi_module); // 这个和上面是对应的。
if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) {
return NGX_HTTP_NOT_ALLOWED;
}
if (r->headers_in.if_modified_since) {
return NGX_HTTP_NOT_MODIFIED;
}
r->headers_out.content_type.len = sizeof("text/html") - 1;
r->headers_out.content_type.data = (u_char *) "text/html";
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = cglcf->ecdata.len;
if (r->method == NGX_HTTP_HEAD) {
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
}
b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
if (b == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "Failed to allocate response buffer.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
out.buf = b;
out.next = NULL;
b->pos = cglcf->ecdata.data;
b->last = cglcf->ecdata.data+(cglcf->ecdata.len);
b->memory = 1;
b->last_buf = 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); // 交给过滤器
}
static char *
ngx_echo_readconf(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
printf("called:ngx_echo_readconf\n");
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
clcf->handler = ngx_echo_handler; // 2、ngx_echo_handler是程序第二步
ngx_conf_set_str_slot(cf,cmd,conf);
return NGX_CONF_OK;
}
static void *
ngx_echo_create_loc_conf(ngx_conf_t *cf)
{
printf("called:ngx_echo_create_loc_conf\n");
ngx_echo_loc_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_echo_loc_conf_t));
if (conf == NULL) {
return NGX_CONF_ERROR;
}
conf->ecdata.len=0;
conf->ecdata.data=NULL;
conf->enable = NGX_CONF_UNSET;
return conf;
}
static char *
ngx_echo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
printf("called:ngx_echo_merge_loc_conf\n");
ngx_echo_loc_conf_t *prev = parent;
ngx_echo_loc_conf_t *conf = child;
ngx_conf_merge_str_value(conf->ecdata, prev->ecdata, 10);
ngx_conf_merge_value(conf->enable, prev->enable, 0);
/**
if(conf->enable)
ngx_echo_init(conf);
*/
return NGX_CONF_OK;
return NGX_CONF_OK;
}
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