wip

kong/plugins/ddtrace/handler.lua

@@ -174,11 +174,7 @@ local function apply_resource_name_rules(uri, rules)
 end
 
 local function configure(conf)
-    local get_from_vault = kong.vault.get
-    local get_env = function(env_name)
-        local env_value, _ = get_from_vault(string.format("{vault://env/%s}", env_name))
-        return env_value
-    end
+    local get_env = utils.get_env
 
     -- Build agent url
     local agent_host = get_env("DD_AGENT_HOST") or conf.agent_host or "localhost"

kong/plugins/ddtrace/utils.lua

@@ -1,3 +1,5 @@
+local lrucache = require("resty.lrucache")
+
 local ffi = require("ffi")
 ffi.cdef([[
 unsigned long long int strtoull(const char *nptr, char **endptr, int base);
@@ -124,9 +126,26 @@ local function join_table(separator, table)
     return result
 end
 
+local LRU = lrucache.new(1000)
+
+local function get_env(key)
+    local value = LRU:get(key)
+    if value then
+        return value
+    end
+
+    value = os.getenv(key)
+    if value then
+        LRU:set(key, value)
+    end
+
+    return value
+end
+
 return {
     concat = concat,
     dump = dump,
+    get_env = get_env,
     join_table = join_table,
     normalize_header_tags = normalize_header_tags,
     parse_uint64 = parse_uint64,