Is it possible to access the value of a location block's prefix/regex as a variable?

bmarini · 2018-01-06T02:00:47+00:00

Hi, I have recently been working on unlocking the creation of lua_shared_dicts from Lua. Here is a proposed patch:...

Is it possible to access the value of a location block's prefix/regex as a variable?

bmarini

I have some lua code that is instrumenting requests and tagging those metrics with host and upstream info, but it would be really useful to include the location block value as a tag as well. Is this information exposed as a variable? For instance:

location /api/v1 {

log_by_lua_block {

ngx.var.location_val -- "/api/v1"

}

location /api/v2 {

log_by_lua_block {

ngx.var.location_val -- "/api/v2"

}

I know I could manually copy the location values into a context variable for every location block in my nginx config, but am hoping there is a better way.

qleex001

location ^~ (/api/v1) {
   set $location_val $1;
   log_by_lua_block {
       ngx.log(ngx.ERR, ngx.var.location_val) --"/api/v1"
   }
}

在 2018年1月6日星期六 UTC+8上午2:00:47，Ben Marini写道：

I have some lua code that is instrumenting requests and tagging those metrics with host and upstream info, but it would be really useful to include the location block value as a tag as well. Is this information exposed as a variable? For instance:

location /api/v1 {
log_by_lua_block {
ngx.var.location_val -- "/api/v1"
}
}

location /api/v2 {
log_by_lua_block {
ngx.var.location_val -- "/api/v2"
}
}

I know I could manually copy the location values into a context variable for every location block in my nginx config, but am hoping there is a better way.