From aebcf4e527063a10f4b22ed476766926a45d4f50 Mon Sep 17 00:00:00 2001
From: James Crayne <jim.crayne@gmail.com>
Date: Fri, 24 Jan 2020 10:27:14 +0000
Subject: Catch exceptions on no avahi dbus service.

---
 dht/dht-client.cabal   |  1 +
 dht/src/DebugTag.hs    |  1 +
 dht/src/Network/Tox.hs | 14 ++++++++++++--
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/dht/dht-client.cabal b/dht/dht-client.cabal
index 79a72c05..e56d67f4 100644
--- a/dht/dht-client.cabal
+++ b/dht/dht-client.cabal
@@ -158,6 +158,7 @@ library
   build-depends:      base
                     , containers
                     , constraints
+                    , dbus
                     , dependent-map
                     , array
                     , hashable
diff --git a/dht/src/DebugTag.hs b/dht/src/DebugTag.hs
index 93b5b74f..37593e63 100644
--- a/dht/src/DebugTag.hs
+++ b/dht/src/DebugTag.hs
@@ -7,6 +7,7 @@ data DebugTag
   = XAnnounce
   | XAnnounceResponse
   | XBitTorrent
+  | XDBus
   | XLan
   | XMan
   | XNetCrypto
diff --git a/dht/src/Network/Tox.hs b/dht/src/Network/Tox.hs
index 1628b435..e0704f6f 100644
--- a/dht/src/Network/Tox.hs
+++ b/dht/src/Network/Tox.hs
@@ -88,6 +88,8 @@ import Network.SessionTransports
 import Network.Kademlia.Search
 import HandshakeCache
 import Data.ByteString.Base16 as Base16
+import qualified DBus.Client as DBus
+import Control.Exception
 
 updateIP :: TVar (R.BucketList NodeInfo) -> SockAddr -> STM ()
 updateIP tblvar a = do
@@ -446,6 +448,12 @@ dnssdDiscover tox ni toxid = do
 
   void $ DHT.pingUDP (toxDHT tox) ni
 
+-- | Log a dbus error
+putDBusError bFatal msg = do
+    let fatality = if bFatal then "Fatal" else "Non-Fatal"
+        prefix = fatality <> " DBus Exception: "
+    dput XDBus (prefix <> msg)
+
 -- | Returns:
 --
 --   * action to shutdown this node, terminating all threads.
@@ -469,8 +477,10 @@ forkTox tox with_avahi with_tcp = do
     refresher4 <- forkPollForRefresh (DHT.refresher4 $ toxRouting tox)
     refresher6 <- forkPollForRefresh (DHT.refresher6 $ toxRouting tox)
     quitAvahi <- if with_avahi then do
-                    dnssdIn <- forkIO $ queryToxService (dnssdDiscover tox)
-                    dnssdOut <- forkIO $ dnssdAnnounce tox
+                    dnssdIn <- forkIO (queryToxService (dnssdDiscover tox)
+                                         `catch` \(e::DBus.ClientError) -> putDBusError (DBus.clientErrorFatal e) (DBus.clientErrorMessage e))
+                    dnssdOut <- forkIO ( dnssdAnnounce tox
+                                         `catch` \(e::DBus.ClientError) -> putDBusError (DBus.clientErrorFatal e) (DBus.clientErrorMessage e))
                     labelThread dnssdIn  "tox-avahi-monitor"
                     labelThread dnssdOut "tox-avahi-publish"
                     return $ forM_ [dnssdIn,dnssdOut] killThread
-- 
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