feature: the get() method now also returns the stale value as the sec…

…ond returned value if available.

README.markdown

@@ -164,10 +164,12 @@ When the cache is full, the cache will automatically evict the least recently us
 
 get
 ---
-`syntax: data = cache:get(key)`
+`syntax: data, stale_data = cache:get(key)`
 
 Fetches a value with the key. If the key does not exist in the cache or has already expired, a `nil` value will be returned.
 
+Starting from `v0.03`, the stale data is also returned as the second return value if available.
+
 [Back to TOC](#table-of-contents)
 
 delete

lib/resty/lrucache.lua

@@ -157,7 +157,7 @@ function _M.get(self, key)
 
     if node.expire >= 0 and node.expire < ngx_now() then
         -- print("expired: ", node.expire, " > ", ngx_now())
-        return nil
+        return nil, val
     end
     return val
 end

lib/resty/lrucache/pureffi.lua

@@ -369,7 +369,7 @@ function _M.get(self, key)
     local expire = node.expire
     if expire >= 0 and expire < ngx_now() then
         -- print("expired: ", node.expire, " > ", ngx_now())
-        return nil
+        return nil, self.val_v[node_id]
     end
 
     return self.val_v[node_id]

t/pureffi/sanity.t

@@ -165,7 +165,7 @@ bird: 76
 --- response_body
 dog: 32
 dog: 32
-dog: nil
+dog: nil32
 
 --- no_error_log
 [error]

t/sanity.t

@@ -165,7 +165,7 @@ bird: 76
 --- response_body
 dog: 32
 dog: 32
-dog: nil
+dog: nil32
 
 --- no_error_log
 [error]