ctgpf opened a new issue #4529:
URL: https://github.com/apache/apisix/issues/4529
### Issue description
Hello all,
I'm trying to use this simple lua function in serverless plugin:
```
"plugins": {
"serverless-post-function": {
"disable": false,
"functions": [
"return function() ngx.log(ngx.ERR, \"BEGIN:\"); os.execute('curl
http://127.0.0.1:9180/apisix/admin/plugins/list -H \"X-API-KEY:
edd1c9f034335f136f87ad84b625c8f1\"'); ngx.log(ngx.ERR, \"END:\"); end"
],
"phase": "body_filter"
}
}
```
But when testing, the curl command hangs indefinitely and never ends...
Here are some debug information:
> **# strace -p <curl_PID>**
> poll([{fd=4, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0
(Timeout)
> poll([{fd=4, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0
(Timeout)
> ...
> poll([{fd=4, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0
(Timeout)
> poll([{fd=4, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 0
(Timeout)
So the curl is waiting for the fd 4 to become ready, but timeout.
> **# ls -l /proc/<curl_PID>/fd**
> 4 -> socket:[91241]
> **# lsof -p <PID> |grep 91241**
> TCP localhost:49198->localhost:9180 (ESTABLISHED)
So the socket is opened and the tcpdump shows that the GET method is indeed
sent. But no response from the REST Admin API.
For information, os.execute('curl
http://127.0.0.1:9180/apisix/admin/plugins/list -H \"X-API-KEY:
edd1c9f034335f136f87ad84b625c8f1\" **&**'); with the '&' at the end works, but
I want to wait until curl finishes instead of launching in background.
Setting the timeout option to curl, os.execute('curl **-m 3** http://...')
triggers the timeout in apisix error.log:
> curl: (28) Operation timed out after 3001 milliseconds with 0 out of -1
bytes received
I have tried other methods, but they failed too:
- wget instead of curl
- io.popen() instead of os.execute()
Can someone please know how to make it work?
### Environment
Request help without environment information will be ignored or closed.
* apisix version (cmd: `apisix version`): 2.6
* OS (cmd: `uname -a`): Linux localhost.localdomain
3.10.0-1160.31.1.el7.x86_64 #1 SMP Thu Jun 10 13:32:12 UTC 2021 x86_64 x86_64
x86_64 GNU/Linux
* OpenResty / Nginx version (cmd: `nginx -V` or `openresty -V`): nginx
version: openresty/1.19.3.2
* etcd version, if have (cmd: run `curl
http://127.0.0.1:9090/v1/server_info` to get the info from server-info API):
"etcd_version":"3.5.0"
* apisix-dashboard version, if have: 2.7
* luarocks version, if the issue is about installation (cmd: `luarocks
--version`): 3.4.0
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