update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / jaegertracing / thrift / lib / hs / src / Thrift / Transport / Memory.hs

diff --git a/ceph/src/jaegertracing/thrift/lib/hs/src/Thrift/Transport/Memory.hs b/ceph/src/jaegertracing/thrift/lib/hs/src/Thrift/Transport/Memory.hs
new file mode 100644 (file)
index 0000000..1c93af6
--- /dev/null
+++ b/ceph/src/jaegertracing/thrift/lib/hs/src/Thrift/Transport/Memory.hs
@@ -0,0 +1,77 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements. See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership. The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License. You may obtain a copy of the License at
+--
+--   http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing,
+-- software distributed under the License is distributed on an
+-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+-- KIND, either express or implied. See the License for the
+-- specific language governing permissions and limitations
+-- under the License.
+--
+
+module Thrift.Transport.Memory
+       ( openMemoryBuffer
+       , MemoryBuffer(..)
+       ) where
+
+import Data.ByteString.Lazy.Builder
+import Data.Functor
+import Data.IORef
+import Data.Monoid
+import qualified Data.ByteString.Lazy as LBS
+
+import Thrift.Transport
+
+
+data MemoryBuffer = MemoryBuffer {
+  writeBuffer :: IORef Builder,
+  readBuffer :: IORef LBS.ByteString
+}
+
+openMemoryBuffer :: IO MemoryBuffer
+openMemoryBuffer = do
+  wbuf <- newIORef mempty
+  rbuf <- newIORef mempty
+  return MemoryBuffer {
+    writeBuffer = wbuf,
+    readBuffer = rbuf
+  }
+
+instance Transport MemoryBuffer where
+  tIsOpen = const $ return False
+  tClose  = const $ return ()
+  tFlush trans = do
+    let wBuf = writeBuffer trans
+    wb <- readIORef wBuf
+    modifyIORef (readBuffer trans) $ \rb -> mappend rb $ toLazyByteString wb
+    writeIORef wBuf mempty
+
+  tRead _ 0 = return mempty
+  tRead trans n = do
+    let rbuf = readBuffer trans
+    rb <- readIORef rbuf
+    let len = fromIntegral $ LBS.length rb
+    if len == 0
+      then do
+        tFlush trans
+        rb2 <- readIORef (readBuffer trans)
+        if (fromIntegral $ LBS.length rb2) == 0
+          then return mempty
+          else tRead trans n
+      else do
+        let (ret, remain) = LBS.splitAt (fromIntegral n) rb
+        writeIORef rbuf remain
+        return ret
+
+  tPeek trans = (fmap fst . LBS.uncons) <$> readIORef (readBuffer trans)
+
+  tWrite trans v = do
+    modifyIORef (writeBuffer trans) (<> lazyByteString v)