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digraph {
graph [fontname = "monospace"];
node [fontname = "monospace"];
edge [fontname = "monospace"];
Drop [label="Drop query"];
Incoming_Query [label="Incoming Query"];
Allowed_ACL [label="In the ACL allow list?"];
Incoming_Query -> Allowed_ACL;
Allowed_ACL -> Drop [label="no"];
Allowed_ACL -> Dynamically_Blocked [label="yes"];
Dynamically_Blocked [label="DynBlocked?"];
Perform_DynBlock_Action [label="Perform DynBlock action"];
MatchRules [label="Query matches a rule?"];
Dynamically_Blocked -> Perform_DynBlock_Action [label="yes"];
Dynamically_Blocked -> MatchRules [label="no"];
MatchRules -> "Perform Action" [label="yes"];
MatchRules -> DeterminePool [label="no"];
DeterminePool [label="Determine pool and policy"];
"Perform Action" -> IsResponse;
"Perform Action" -> MatchRules [label="Action is non-terminal"];
"Perform Action" -> Drop [label="DropAction()"];
IsResponse [label="Query is now a response?"];
IsResponse -> "Return response to client" [label="yes"];
IsResponse -> DeterminePool [label="no"];
HasCache [label="Does the pool have a packet cache?"];
skipCache [label="Should the cache be skipped?"];
DeterminePool -> HasCache;
HasCache -> skipCache [label="yes"];
HasCache -> HasPolicy [label="no"];
skipCache -> HasPolicy [label="yes"];
skipCache -> CacheHit [label="no"];
CacheHit [label="Cache Hit?"];
CacheHit -> MakeResponse [label="yes"];
CacheHit -> HasPolicy [label="no"];
MakeResponse [label="Create Response"];
MatchCacheRespRule [label="Response matches CacheHitRule?"];
MakeResponse -> MatchCacheRespRule;
MatchCacheRespRule -> "Return response to client" [label="no"];
MatchCacheRespRule -> "Perform CacheHit Action" [label="yes"];
"Perform CacheHit Action" -> "Return response to client";
HasPolicy [label="Does the pool have a policy?"];
HasPolicy -> "Is servFailOnNoPolicy set?" [label="no"];
"Is servFailOnNoPolicy set?" -> Drop [label="no"];
"Is servFailOnNoPolicy set?" -> ServFail [label="yes"];
HasPolicy -> "Send Query to backend server" [label="yes"];
"Send Query to backend server" -> "Got Response from backend";
RespRule [label="Response matches a ResponseRule?"];
"Got Response from backend" -> RespRule;
RespRule -> "Perform ResponseAction" [label="yes"];
"Perform ResponseAction" -> RespRule [label="Action was non-terminal"];
RespRule -> AddToCache [label="no"];
"Perform ResponseAction" -> AddToCache;
"Perform ResponseAction" -> Drop [label="DropAction()"];
AddToCache [label="Add to PacketCache"];
AddToCache -> "Return response to client";
}
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