nginx的helloworld模块的helloworld
经典的nginx的helloworld尝试了一下过程就是
nginx--->config文件---->module--->command[]<----->函数----->handler
| |
ctx等 位置等
函数就是这个ngx_http_hello_world，和command[]互相指
自己加的注释
ngx_http_hello_world_module.c
-----------------------
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_buf.h>
staticchar *ngx_http_hello_world(ngx_conf_t *cf ,ngx_command_t *cmd,void *conf);
//*cf 指向ngx_conf_t 结构体指针，从指令后面传过来的参数
//*cmd 指向当前结构体ngx_command_t 的指针(互相指)
//*conf指向自定义模块配置结构体的指针
static ngx_command_t ngx_http_hello_world_commands[]={
{
ngx_string("hello_world"),//指令名称，nginx.conf中使用
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,//注释1
ngx_http_hello_world,//回调函数 ，上面定义的带三个参数
0,//保持的值放的位置：全局，server，location
0,//指令的值保存的位置
NULL //一般都为NULL
},
ngx_null_command//读入ngx_null_command 指令后停止
};
static u_char ngx_hello_world[]="hello world";
//ngx_http_<module name>_module_ctx用于创建和合并三个配置
//参考http/ngx_http_config.h
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 localtion configuration
};
//nginx进程，线程相关，ngx_http_<module name>_module
//这个模块的定义是把数据处理关联到特定模块的关键
ngx_module_t ngx_http_hello_world_module={
NGX_MODULE_V1,
&ngx_http_hello_world_module_ctx,//module context
ngx_http_hello_world_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
};
static ngx_int_t ngx_http_hello_world_handler(ngx_http_request_t *r)
{
ngx_buf_t *b;
ngx_chain_t out;
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.buf=b;
out.next=NULL;
b->pos=ngx_hello_world;
b->last=ngx_hello_world+sizeof(ngx_hello_world);
b->memory=1;
b->last_buf=1;
r->headers_out.status=NGX_HTTP_OK;
r->headers_out.content_length_n=sizeof(ngx_hello_world);
ngx_http_send_header(r);
return ngx_http_output_filter(r,&out);
}
//回调函数，1获得location中的“核心”结构体，2为他分配个处理函数
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;
}
---------------------------
config:
ngx_addon_name=ngx_http_hello_world_module
HTTP_MODULES="$HTTP_MODULES ngx_http_hello_world_module"
NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_hello_world_module.c"
CORE_LIBS="$CORE_LIBS -lpcre"
config和c文件放到同一个目录下，比如/opt/nginxtest，nginx-1.0.4解压到/opt/nginxtest/nginx
然后编译nginx
./configure --help|grep debug
./configure --prefix=/opt/nginxtest/nginx --add-module=/opt/nginxtest/nginx_hello_world/
或./configure --with-debug --prefix=/opt/nginxtest/nginx --add-module=/opt/nginxtest/nginx_hello_world/
在objs/下生成Makefile之后
修改
CC = gcc -g
让他支持gdb看代码
make
make install
配置nginx.conf
location /hello {
hello_world;
}
启动nginx
curl http://localhost/hello
然后hello world出来了，牛b了
注释1：
NGX_HTTP_MAIN_CONF指令出现在全局位置部分是合法的
NGX_HTTP_SRV_CONF指令出现在server主机配置部分是合法的
NGX_HTTP_LOC_CONF指令出现在Location配置部分是合法的
NGX_HTTP_UPS_CONF指令出现在upstream配置部分是合法的
NGX_CONF_NOARGS指令没有参数
NGX_CONF_TAKE1指令读一个参数
。。。。。
NGX_CONF_TAKE7指令读7个参数
NGX_CONF_FLAG指令读一个布尔型数据
NGX_CONF_1MORE指令至少读一个参数
NGX_CONF_2MORE指令至少读2个参数
ldd命令查看依赖的动态库
root@red54apple objs]# ldd nginx
libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003b6ee00000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x0000003b80400000)
libpcre.so.0 => /usr/local/lib/libpcre.so.0 (0x00002aadbeab3000)
libcrypto.so.6 => /lib64/libcrypto.so.6 (0x0000003291200000)
libz.so.1 => /lib64/libz.so.1 (0x0000003290a00000)
libc.so.6 => /lib64/libc.so.6 (0x0000003b6e200000)
/lib64/ld-linux-x86-64.so.2 (0x0000003b6de00000)
libdl.so.2 => /lib64/libdl.so.2 (0x0000003b6ea00000)
#
-------------调试--------
gdb -d /opt/nginxtest/nginx/sbin/ nginx 10540
l就能看代码了
----------ltrace 和strace-------------
strace -T -c -p 10700
curl localhost/hello
ctl+c 看epoll调用次数
# strace -T -c -p 10700
Process 10700 attached - interrupt to quit
Process 10700 detached
% time secondsusecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
100.00 0.000060 60 1 write
0.00 0.000000 0 1 close
0.00 0.000000 0 1 ioctl
0.00 0.000000 0 1 writev
0.00 0.000000 0 1 accept
0.00 0.000000 0 3 1 recvfrom
0.00 0.000000 0 1 setsockopt
0.00 0.000000 0 3 epoll_wait
0.00 0.000000 0 1 epoll_ctl
------ ----------- ----------- --------- --------- ----------------
100.00 0.000060 13 1 total
# ldconfig -p |grep mysql
----------------------
ltrace -p 10700 注意这里用worker进程，master木有
curl localhost/hello
得到
# ltrace -p 10700
__errno_location() = 0x2b8699230640
gettimeofday(0x7fff5219a250, NULL) = 0
localtime_r(0x7fff5219a1b8, 0x7fff5219a2a0, 84, 0, 0x6c7d27) = 0x7fff5219a2a0
epoll_wait(8, 0xa607610, 512, 0xffffffff, 0x6c8b48
) = 1
gettimeofday(0x7fff5219a250, NULL) = 0
localtime_r(0x7fff5219a1b8, 0x7fff5219a2a0, 84, 0, 0x6c7d45) = 0x7fff5219a2a0
accept(6, 0x7fff5219a250, 0x7fff5219a2c0, 0xa621250, 0x6c8b62) = 3
memset(0x2b869943c180, '\000', 184) = 0x2b869943c180
memset(0xa621320, '\000', 104) = 0xa621320
memset(0xa63b330, '\000', 104) = 0xa63b330
posix_memalign(0x7fff5219a1b0, 16, 256, 0xa63b330, 104) = 0
ioctl(3, 21537, 0x7fff5219a1fc) = 0
epoll_ctl(8, 1, 3, 0x7fff5219a160, 0xa613718) = 0
epoll_wait(8, 0xa607610, 512, 60000, 0xa613718) = 1
gettimeofday(0x7fff5219a250, NULL) = 0
malloc(1256) = 0xa608e20
posix_memalign(0x7fff5219a170, 16, 256, 256, 3) = 0
malloc(1024) = 0xa609310
posix_memalign(0x7fff5219a240, 16, 4096, 144, 3) = 0
recv(3, 0xa609310, 1024, 0, 3) = 158
strncmp("penSSL/0.9.8b zlib/1.2.3 libidn/"..., "pera", 4) = -4
strncmp("SL/0.9.8b zlib/1.2.3 libidn/0.6."..., "afari/", 6) = -14
strncmp("L/0.9.8b zlib/1.2.3 libidn/0.6.5", "afari/", 6) = -21
writev(3, 0x7fff52199650, 2, 0x7fff52199650, 0xa60a1cd) = 159
write(4, "127.0.0.1 - - [29/Nov/2011:15:21"..., 170) = 170
free(0xa609720) = <void>
free(0xa608e20) = <void>
free(0xa609310) = <void>
setsockopt(3, 6, 1, 0x7fff52199fe4, 4) = 0
malloc(1024) = 0xa608e20
__errno_location() = 0x2b8699230640
recv(3, 0xa608e20, 1024, 0, 3) = 0
close(3) = 0
free(0xa608e20) = <void>
free(0xa613680) = <void>
free(0xa5fe390) = <void>
epoll_wait(8, 0xa607610, 512, 0xffffffff, 0
<unfinished ...>
#
这下牛b了吧
然后就该看这个了
http://www.evanmiller.org/nginx-modules-guide.html
顺便统计下代码行数
find . -name "*.c" |xargs cat|wc -l
find . -name "*.c" |xargs cat|grep -v ^$|wc -l
8万有效代码，精读吧，恩，好的
更多需要参考
http://search.cpan.org/~agent/
http://agentzh.org/#Presentations
agentzh.blogspot.com
zhangyichun那个大牛
微薄叫agentzh
http://www.codinglabs.org/html/intro-of-nginx-module-development.html
echo模块
http://openresty.org/
多模块的开发
视频和ppt
http://agentzh.org/misc/slides/perl-lz-apps/#26
http://t.cn/S4WEFG
upstream main_db {
drizzle_server 127.0.0.1:3306
user=monty password=some_pass dbname=test
protocol=mysql;
drizzle_keepalive max=10 overflow=reject
mode=single;
}
location /mysql {
set_unescape_uri $sql $arg_sql;
set_unescape_uri $backend $arg_backend;
drizzle_query $sql;
drizzle_pass $backend;
}
----------
如果在mac lion下编译则用
./configure --prefix=/Users/apple/Desktop/myfile/nginxtest/nginx --with-cc-opt="-Wno-deprecated-declarations"
否则过不去
页:
[1]