openresty函数总结

1、获取http请求nethod

ngx.req.get_method()

2、获取请求体body

ngx.req.get_body_data()
ngx.req.read_body()

3、获取请求参数args

ngx.req.get_uri_args()

4、获取时间日期相关函数

ngx.today()：本地时间，格式是yyyy-mm-dd，不含时分秒
ngx.localtime()：本地时间，格式是yyyy-mm-dd hh:mm:ss
ngx.utctime()：UTC 时间，格式是yyyy-mm-dd hh:mm:ss
ngx.time()：当前的时间戳，即epoch以来的秒数
ngx.now()：类似ngx.time，但返回的是浮点数，精确到毫秒
ngx.http_time()：把时间戳转换为http时间格式
ngx.cookie_time()：把时间戳转换为cookie时间格式
ngx.parse_http_time()：解析http 时间格式，转换为时间戳

5、批量子请求

res1, res2, res3 = ngx.location.capture_multi{
     { "/foo", { args = "a=3&b=4" } },
     { "/bar" },
     { "/baz", { method = ngx.HTTP_POST, body = "hello" } },
 } --注意：这里省略了(),相当于({{}})
if res1.status == ngx.HTTP_OK then
     ...
 end

6、share_all_vars使用

location ~ /comment/([0-9]+) {
    internal;
    set $goodsId $1;
    set $dog "$dog world";
    echo "$uri dog: $dog";
}
location ~ /goods/detail/([0-9]+) {
    set $goodsId $1;
    default_type  plain/text;
    set $dog 'hello';
    content_by_lua_block{
        local res = ngx.location.capture("/comment/"..ngx.var.goodsId.."?rank=5",{
            method = ngx.HTTP_GET,
            share_all_vars = true,
        })
        ngx.print(res.body)
        ngx.say(ngx.var.uri, ": ", ngx.var.dog)
    }
}

7、ctx使用

location ~ /comment/([0-9]+) {
    internal;
    set $goodsId $1;
    content_by_lua_block{
        ngx.ctx.foo = "bar"
    }
}
location ~ /goods/detail/([0-9]+) {
    set $goodsId $1;
    default_type  plain/text;
    content_by_lua_block{
        local c = {}
        local res = ngx.location.capture("/comment/"..ngx.var.goodsId.."?rank=5",{
            method = ngx.HTTP_GET,
            ctx = c,
        })
        ngx.say(c.foo)
        ngx.say(ngx.ctx.foo)
    }
}

8、always_forward_body使用

local res = ngx.location.capture("/comment/"..ngx.var.goodsId.."?rank=5",{
    method = ngx.HTTP_GET,
    body = 'hello, world',
    always_forward_body = false, --也可以设置为true
})