introduce state to support AXFR (wip)

[pdns-pipe-nmc.git] / pdns-pipe-nmc.hs

diff --git a/pdns-pipe-nmc.hs b/pdns-pipe-nmc.hs
index f2669a23489ef7eae103838bf29ed2dd45c8ce80..4bd87582d8a31d1467b4b96cfbd816445a242eea 100644 (file)
--- a/pdns-pipe-nmc.hs
+++ b/pdns-pipe-nmc.hs
@@ -9,11 +9,13 @@ import System.IO.Error
 import Control.Exception
 import Text.Show.Pretty hiding (String)
 import Control.Monad
-import Data.ByteString.Lazy hiding (reverse, putStr, putStrLn, head)
+import Control.Monad.State
+import Data.ByteString.Lazy hiding (reverse, putStr, putStrLn, head, empty)
 import qualified Data.ByteString.Char8 as C (pack)
 import qualified Data.ByteString.Lazy.Char8 as L (pack)
 import qualified Data.Text as T (pack)
 import Data.List.Split
+import Data.Map.Lazy (Map, empty, insert, delete, size)
 import Data.Aeson (encode, decode, Value(..))
 import Network.HTTP.Types
 import Data.Conduit
@@ -58,21 +60,20 @@ qRsp rsp =
 
 -- NMC interface
 
-queryNmc :: Manager -> Config -> String -> String
-         -> IO (Either String NmcDom)
-queryNmc mgr cfg qid fqdn =
+queryOpNmc cfg mgr qid key =
+  runResourceT (httpLbs (qReq cfg key qid) mgr) >>= return . qRsp
+
+queryOpFile key = catch (readFile key >>= return . Right)
+                        (\e -> return (Left (show (e :: IOException))))
+
+queryDom queryOp fqdn =
   case reverse (splitOn "." fqdn) of
     "bit":dn:xs -> descendNmcDom queryOp xs $ seedNmcDom dn
     _           -> return $ Left "Only \".bit\" domain is supported"
-  where
-    queryOp key = do
-      rsp <- runResourceT $ httpLbs (qReq cfg key qid) mgr
-      -- print $ qRsp rsp
-      return $ qRsp rsp
 
--- Main entry
+-- Main entries
 
-mainNmc = do
+mainPdnsNmc = do
 
   cfg <- readConfig confFile
 
@@ -95,35 +96,43 @@ mainNmc = do
   putStrLn $ "OK\tDnsNmc ready to serve, protocol v." ++ (show ver)
 
   mgr <- newManager def
-  forever $ do
-    l <- getLine
-    case pdnsParse ver l of
-      Left e -> putStr $ pdnsReport e
-      Right preq -> do
-        case preq of
-          PdnsRequestQ qname qtype id _ _ _ ->
-            queryNmc mgr cfg id qname >>= putStr . (pdnsOut ver id qname qtype)
-          PdnsRequestAXFR xfrreq ->
-            putStr $ pdnsReport ("No support for AXFR " ++ xfrreq)
-          PdnsRequestPing -> putStrLn "END"
+  let
+    newcache count name = (insert count name) . (delete (count - 10))
+    io = liftIO
+    mainloop = forever $ do
+      l <- io getLine
+      (count, cache) <- get
+      case pdnsParse ver l of
+        Left e -> io $ putStr $ pdnsReport e
+        Right preq -> do
+          case preq of
+            PdnsRequestQ qname qtype id _ _ _ -> do
+              io $ queryDom (queryOpNmc cfg mgr id) qname
+                     >>= putStr . (pdnsOut ver (show count) qname qtype)
+              io $ putStrLn $ "LOG\tRequest number " ++ (show count)
+                           ++ " id: " ++ id
+                           ++ " qname: " ++ qname
+                           ++ " qtype: " ++ (show qtype)
+                           ++ " cache size: " ++ (show (size cache))
+              put (count + 1, newcache count qname cache)
+            PdnsRequestAXFR xfrreq ->
+              io $ putStr $ pdnsReport ("No support for AXFR " ++ xfrreq)
+            PdnsRequestPing -> io $ putStrLn "END"
+  runStateT mainloop (0, empty) >> return ()
 
 -- query by key from Namecoin
 
 mainOne key = do
   cfg <- readConfig confFile
   mgr <- newManager def
-  dom <- queryNmc mgr cfg "+" key
+  dom <- queryDom (queryOpNmc cfg mgr "_") key
   putStrLn $ ppShow dom
-  putStr $ pdnsOut 1 "+" key RRTypeANY dom
+  putStr $ pdnsOut 1 "_" key RRTypeANY dom
 
 -- using file backend for testing json domain data
 
-queryFile :: String -> IO (Either String ByteString)
-queryFile key = catch (readFile key >>= return . Right)
-                      (\e -> return (Left (show (e :: IOException))))
-
 mainFile key = do
-  dom <- descendNmcDom queryFile [] (seedNmcDom key)
+  dom <- queryDom queryOpFile key
   putStrLn $ ppShow dom
   putStr $ pdnsOut 1 "+" key RRTypeANY dom
 
@@ -132,7 +141,7 @@ mainFile key = do
 main = do
   args <- getArgs
   case args of
-    []         -> mainNmc
+    []         -> mainPdnsNmc
     [key]      -> mainOne key
     ["-f",key] -> mainFile key
-    _ -> error $ "usage: empty args, or \"<key>\", or \"-f <key>\""
+    _ -> error $ "usage: empty args, or \"[-f] <fqdn>\""