zwjzxh520 opened a new issue #4869:
URL: https://github.com/apache/apisix/issues/4869
### Issue description
依照 api-breaker 自己编写了一个插件，将计数器放到redis中，但是发现运行的时候一直报以下错误：
```
2021/08/20 16:46:14 [error] 45#45: *2067 failed to run log_by_lua*:
/usr/local/apisix/apisix/patch.lua:315: API disabled in the context of
log_by_lua*
stack traceback:
[C]: in function 'original_tcp'
/usr/local/apisix/apisix/patch.lua:315: in function 'tcp'
/usr/local/openresty/lualib/resty/redis.lua:63: in function 'redis_new'
/usr/local/apisix/apisix/plugins/sdp-api-breaker.lua:131: in function
'new_redis'
/usr/local/apisix/apisix/plugins/sdp-api-breaker.lua:239: in function
'phase_func'
/usr/local/apisix/apisix/plugin.lua:679: in function 'common_phase'
/usr/local/apisix/apisix/init.lua:681: in function 'http_log_phase'
```
报错相关代码如下：
```lua
function _M.log(conf, ctx)
local redis_util, err = new_redis(conf)
if redis_util == nil then
core.log.error("redis init failed at _M.log, err: ", err)
return
end
local unhealthy_key = gen_unhealthy_key(ctx)
local healthy_key = gen_healthy_key(ctx)
local upstream_status = core.response.get_upstream_status(ctx)
```
请帮忙找找解决办法，谢谢大家了～
### Environment
- apisix version (cmd: `apisix version`): **2.8**
- OS (cmd: `uname -a`): **alpine docker**
- OpenResty / Nginx version (cmd: `nginx -V` or `openresty -V`): **nginx
version: openresty/1.19.3.1**
- etcd version, if have (cmd: run `curl
http://127.0.0.1:9090/v1/server_info` to get the info from server-info API):
**3.4.0**
- apisix-dashboard version, if have:
- luarocks version, if the issue is about installation (cmd: `luarocks
--version`):
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