hmthoo commented on issue #8117:
URL: https://github.com/apache/apisix/issues/8117#issuecomment-1288765824
> > How to get the node information of an existing upstream to add to
up_conf？For example, get the nodes information in my test upstream
"upstream-test-a" and add it to the variable up_conf.
>
> `ctx.matched_upstream`, you can dump ctx by `ngx.log(ngx.WARN, "ctx : ",
require("inspect")(ctx, {depth = 2}))`, and search info in ctx.
### code
```
local up_conf = {
type = "roundrobin",
nodes = {
{host = "192.168.100.92" , port = 8088 , weight = 10},
{host = "192.168.100.91" , port = 8088 , weight = 10},
}
}
core.log.warn(core.json.delay_encode(up_conf.nodes, true))
local upstream_key = up_conf.type .. "#route_" .. matched_route.value.id
upstream.set(ctx, upstream_key, ctx.conf_version, up_conf)
```
### error.log
```
2022/10/24 09:51:57 [warn] 6666#6666: *35590445 [lua]
saas-canary-dispatch.lua:63: phase_func():
[{"weight":10,"host":"192.168.100.91","port":8088},{"weight":10,"host":"192.168.100.92","port":8088}],
client: 10.10.40.52, server: _, request: "GET /test/tologin HTTP/2.0", host:
"test.com"
2022/10/24 09:51:57 [error] 6666#6666: *35590445 lua entry thread aborted:
runtime error: /usr/local/apisix/apisix/balancer.lua:55: table index is nil
stack traceback:
coroutine 0:
/usr/local/apisix/apisix/balancer.lua: in function 'transform_node'
/usr/local/apisix/apisix/balancer.lua:69: in function
'fetch_health_nodes'
/usr/local/apisix/apisix/balancer.lua:115: in function 'create_obj_fun'
/usr/local/apisix/apisix/core/lrucache.lua:95: in function
'lrucache_server_picker'
/usr/local/apisix/apisix/balancer.lua:247: in function 'pick_server'
/usr/local/apisix/apisix/init.lua:547: in function 'http_access_phase'
access_by_lua(nginx.conf:344):2: in main chunk, client: 10.10.40.52,
server: _, request: "GET /test/tologin HTTP/2.0", host: "test.com"
```
### question
when I try to add more than one nodes in "up_conf.nodes" , an error is
reported
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