jinnyu opened a new issue, #7324:
URL: https://github.com/apache/apisix/issues/7324
### Description
Hi, I'm using `http-logger` plugin to log request to Loki.
I configed `log_format` to this
```
{
"log_format": {
"streams": [
{
"stream": {
"serviceName": "$service_name",
"routeName": "$route_name",
"host": "$host",
"balancer": "$balancer_ip:$balancer_port"
},
"values": [
[
"$unix_ts",
"{\"ts\":\"$unix_ts\",\"status\":\"$status\",\"request\":{\"ua\":\"$http_user_agent\",\"body-size\":\"$body_bytes_sent\",\"request\":\"$request\"},\"upstream\":{\"addr\":\"$upstream_addr\",\"host\":\"$upstream_host\",\"uri\":\"$upstream_uri\",\"status\":\"$upstream_status\",\"responseTime\":\"$upstream_response_time\"}}"
]
]
}
]
}
}
```
(`$unix_ts` is defined by `map` config in apisix main config)
```
apisix:
nginx_config:
http_configuration_snippet: |
map $msec $unix_ts {
~(.*)\.(.*) $1$2;
}
```
All config done, send request to apisix,
Apisix report an error
```
2022/06/24 14:14:27 [error] 49#49: *935 failed to run log_by_lua*:
/usr/local/apisix/apisix/utils/log-util.lua:46: attempt to call method 'byte'
(a nil value)
stack traceback:
/usr/local/apisix/apisix/utils/log-util.lua:46: in function
'create_obj_fun'
/usr/local/apisix/apisix/core/lrucache.lua:95: in function
'lru_log_format'
/usr/local/apisix/apisix/utils/log-util.lua:57: in function
'get_custom_format_log'
/usr/local/apisix/apisix/plugins/http-logger.lua:167: in function
'phase_func'
/usr/local/apisix/apisix/plugin.lua:771: in function 'run_plugin'
/usr/local/apisix/apisix/plugin.lua:804: in function
'run_global_rules'
/usr/local/apisix/apisix/init.lua:311: in function 'common_phase'
/usr/local/apisix/apisix/init.lua:710: in function 'http_log_phase'
log_by_lua(nginx.conf:309):2: in main chunk while logging request,
client: 172.17.132.35, server: _, request: "GET /rest/2.0/ocr/v1/idcard
HTTP/1.1", upstream:
"[https://somehost.com:443/somepath](https://somehost.com/somepath)", host:
"10.26.20.220:4006"
```
So, are variables defined by the map method not supported in the plugin?
And how to solve this?
### Environment
- APISIX version (run `apisix version`): 2.14.1-centos (offical docker image)
- Operating system (run `uname -a`): offical docker image
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`): offical
docker image
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`): 3.4.18
- APISIX Dashboard version, if relevant: 2.13-centos (offical docker image)
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):
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