king: Progress bars on replay.

pkg/hs/urbit-king/TODO.md

@@ -15,7 +15,6 @@ Stubbed out:
 - [x] Snapshots should block until that event is commited to disk.
 - [x] Hook up error callbacks to IO Drivers.
 - [x] Do something useful with error callbacks from IO Drivers.
-- [ ] Make sure replay progress bars go to stderr.
 
 Bugs:
 
@@ -37,9 +36,11 @@ Polish:
 - [x] Cleanup batching flow.
 - [x] Think through how to shutdown the serf on exception.
 - [x] King should shutdown promptly on ^C. Always takes 2s in practice.
+- [x] Bring back progress bars.
+- [x] Make sure replay progress bars go to stderr.
 - [ ] Logging for new IPC flow.
 - [ ] Logging for boot sequence.
-- [ ] Bring back progress bars.
+- [ ] Take snapshots on clean shutdown.
 
 # Misc Bugs
 

pkg/hs/urbit-king/lib/Urbit/Vere/Pier.hs

@@ -184,7 +184,7 @@ resumed
   -> Maybe Word64
   -> [Serf.Flag]
   -> RAcquire PierEnv (Serf, EventLog)
-resumed vSlog replayUntil flags = do
+resumed vSlog replayUntil flags  = do
   rio $ logTrace "Resuming ship"
   top <- view pierPathL
   tap <- fmap (fromMaybe top) $ rio $ runMaybeT $ do

pkg/hs/urbit-king/lib/Urbit/Vere/Serf.hs

@@ -20,14 +20,16 @@ import Control.Monad.Trans.Resource (runResourceT)
 import Urbit.Arvo                   (FX)
 
 import qualified Data.Conduit.Combinators as CC
+import qualified System.ProgressBar       as PB
 import qualified Urbit.Vere.Log           as Log
 
+import Urbit.King.App (HasStderrLogFunc(..))
+
 import qualified Urbit.Vere.Serf.IPC as X (Config(..), EvErr(..), Flag(..),
                                            RunReq(..), Serf, WorkError(..), run,
                                            snapshot, start, stop)
 
 -- ort System.ProgressBar
--- ort Urbit.King.App         (HasStderrLogFunc(..))
 -- ort qualified Urbit.Ob                 as Ob
 -- ort qualified Urbit.Time               as Time
 
@@ -56,7 +58,7 @@ withSerf config = mkRAcquire startup kill
 
 execReplay
   :: forall e
-   . HasLogFunc e
+   . (HasLogFunc e, HasStderrLogFunc e)
   => Serf
   -> Log.EventLog
   -> Maybe Word64
@@ -107,20 +109,41 @@ execReplay serf log last = do
     when (numEvs < 0) $ do
       error "impossible"
 
+    incProgress <- logStderr (trackProgress (fromIntegral numEvs))
+
     logTrace $ display $ "Replaying up to event #" <> tshow replayUpTo
     logTrace $ display $ "Will replay " <> tshow numEvs <> " in total."
 
     env <- ask
 
-    let onProgress n = do
-          runRIO env $ logTrace $ display ("Serf is at event# " <> tshow n)
-
-    runResourceT
+    res <- runResourceT
       $  runConduit
       $  Log.streamEvents log (lastEventInSnap + 1)
       .| CC.take (fromIntegral numEvs)
       .| CC.mapM (fmap snd . parseLogRow)
-      .| replay 10 onProgress serf
+      .| replay 5 incProgress serf
+
+    pure res
+
+logStderr :: HasStderrLogFunc e => RIO LogFunc a -> RIO e a
+logStderr action = do
+  logFunc <- view stderrLogFuncL
+  runRIO logFunc action
+
+trackProgress
+  :: HasLogFunc e
+  => Word64
+  -> RIO e (Int -> IO ())
+trackProgress = \case
+  0   -> pure $ const $ pure ()
+  num -> do
+    let style = PB.defStyle { PB.stylePostfix = PB.exact }
+    let refresh = 10
+    let init = PB.Progress 0 (fromIntegral num) ()
+    bar <- PB.newProgressBar style refresh init
+    env <- ask
+    let incr = PB.incProgress bar
+    pure (runRIO env . incr)
 
 
 -- Collect FX ------------------------------------------------------------------

pkg/hs/urbit-king/lib/Urbit/Vere/Serf/IPC.hs

@@ -481,7 +481,7 @@ replay
   :: forall m
    . (MonadResource m, MonadUnliftIO m, MonadIO m)
   => Int
-  -> (EventId -> IO ())
+  -> (Int -> IO ())
   -> Serf
   -> ConduitT Noun Void m (Maybe PlayBail)
 replay batchSize cb serf = do
@@ -491,7 +491,6 @@ replay batchSize cb serf = do
  where
   loop :: SerfState -> ConduitT Noun Void m (Maybe PlayBail, SerfState)
   loop ss@(SerfState lastEve lastMug) = do
-    io (cb lastEve)
     awaitBatch batchSize >>= \case
       []  -> pure (Nothing, SerfState lastEve lastMug)
       evs -> do
@@ -500,7 +499,9 @@ replay batchSize cb serf = do
         io $ sendWrit serf (WPlay nexEve evs)
         io (recvPlay serf) >>= \case
           PBail bail   -> pure (Just bail, SerfState lastEve lastMug)
-          PDone newMug -> loop (SerfState newEve newMug)
+          PDone newMug -> do
+            io (cb $ length evs)
+            loop (SerfState newEve newMug)
 
 {-|
   TODO If this is slow, use a mutable vector instead of reversing a list.