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nginx模块简单开发(发送字符串方式)

2016-08-20 18:32 543 查看
直接定义一个字符串，用返回字符串的返回到客户端

/*
zhuheming 20160811
*/

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

//定义字符串
static char ngx_http_echo_page[] =
"<html>" CRLF
"<head><title>Welcome to nginx!,I am zhuheming</title></head>" CRLF
"<body bgcolor=\"white\" text=\"black\">" CRLF
"<center><h2>Welcome to nginx! I am zhuheming</h2></p></p></p></p></center>" CRLF
"<h2>I am zhuheming</h2>" CRLF
"</center>" CRLF
"</body>" CRLF
"</html>";

//创建loc配置结构的函数
static void *
ngx_http_echo_create_loc_conf(ngx_conf_t *cf);

//融合loc配置结构
static char *
ngx_http_echo_merge_loc_conf(ngx_conf_t *cf,void *parent,void *child);

//接收到报文之后具体处理的函数
static ngx_int_t
ngx_http_echo_handler(ngx_http_request_t *r);

//存放loc配置文件的结构
typedef struct{
ngx_str_t ed;
}ngx_http_echo_loc_conf_t;

//存放配置参数函数
static char *
ngx_http_echo(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_echo_handler;
//ngx_conf_set_str_slot(cf,cmd,conf);

return NGX_CONF_OK;
}

static ngx_command_t ngx_http_echo_commands[]={
{ngx_string("echo"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
ngx_http_echo,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_echo_loc_conf_t,ed),
NULL
},
ngx_null_command
};

//配置文件处理的各个阶段都不做操作
static ngx_http_module_t ngx_http_echo_module_ctx ={
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};

ngx_module_t ngx_http_echo_module = {
NGX_MODULE_V1,
&ngx_http_echo_module_ctx,
ngx_http_echo_commands,
NGX_HTTP_MODULE,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NGX_MODULE_V1_PADDING
};

static void *
ngx_http_echo_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_echo_loc_conf_t *conf;

conf=ngx_pcalloc(cf->pool,sizeof(ngx_http_echo_loc_conf_t));

if(conf==NULL){
return NGX_CONF_ERROR;
}

conf->ed.len=0;
conf->ed.data=NULL;
return conf;
}

static char *
ngx_http_echo_merge_loc_conf(ngx_conf_t *cf,void *parent,void *child)
{
ngx_http_echo_loc_conf_t *prev=parent;
ngx_http_echo_loc_conf_t *conf=child;

ngx_conf_merge_str_value(conf->ed,prev->ed,"");

return NGX_CONF_OK;
}

//设置报文头和报文体，并发送给报文头处理函数和报文体过滤函数
static ngx_int_t
ngx_http_echo_handler(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t out;

ngx_str_t htmlcontent=ngx_string(ngx_http_echo_page);

if(!(r->method & (NGX_HTTP_HEAD|NGX_HTTP_GET|NGX_HTTP_POST)))
{
return NGX_HTTP_NOT_ALLOWED;
}

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 = htmlcontent.len;

if(r->method == NGX_HTTP_HEAD)
{
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "send head method to client!");
rc = ngx_http_send_header(r);
if(rc != NGX_OK)
{
return rc;
}
}
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "send not head method to client!");
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 = htmlcontent.data;
b->last = htmlcontent.data + (htmlcontent.len);
b->memory = 1;

rc = ngx_http_send_header(r);
if(rc != NGX_OK)
{
return rc;
}

b->last_in_chain=1;
b->last_buf = 1;

ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "send http outputfilter !");
if(ngx_http_output_filter(r, &out)==NGX_OK){
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "send http outputfilter OK!");
return NGX_OK;
}else{
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "send http outputfilter FAILE!");
return NGX_ERROR;
}

}


这种方式直接使用字符串返回，显示在客户端页面上。
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