Update the breakOnDate logic to take into account error

CHANGELOG.md

@@ -13,6 +13,8 @@ All notable changes to this project will be documented in this file.
 
 ### Fixed
 
+- [crawler] Correctly handle errors and do not commit new changes.
+
 ## [1.9.0] - 2023-09-16
 
 ### Added

src/CLI.hs

@@ -33,7 +33,6 @@ import Streaming.Prelude qualified as S
 
 import Data.String.Interpolate (i)
 import Effectful.Prometheus
-import Lentille.GitHub.Types (Changes)
 import ListT qualified
 import Monocle.Backend.Documents (EChange (..))
 import Monocle.Effects

src/Lentille.hs

@@ -20,9 +20,12 @@ module Lentille (
   toIdent,
   ghostIdent,
   sanitizeID,
-  isChangeTooOld,
   swapDuration,
 
+  -- * Stream helper
+  streamDropBefore,
+  Changes,
+
   -- * Re-export
   module Monocle.Class,
   module Monocle.Logging,
@@ -44,6 +47,7 @@ import Monocle.Protob.Change (
  )
 import Network.HTTP.Client qualified as HTTP
 import Proto3.Suite (Enumerated (Enumerated))
+import Streaming.Prelude qualified as S
 
 import Effectful.Reader.Static qualified as E
 
@@ -126,12 +130,26 @@ toIdent host cb username = Ident {..}
 ghostIdent :: Text -> Ident
 ghostIdent host = toIdent host (const Nothing) nobody
 
+type Changes = (Change, [ChangeEvent])
+
+-- | Drop oldest element
+-- This transform the stream by adding a limit.
+-- We don't care about the rest so we replace it with ()
+-- See: https://hackage.haskell.org/package/streaming-0.2.4.0/docs/Streaming-Prelude.html#v:break
+--
+-- >>> let stream = S.yield (Left (DecodeError ["oops"]))
+-- >>> runEff $ S.length_ $ streamDropBefore [utctime|2021-05-31 00:00:00|] stream
+-- 1
+streamDropBefore :: UTCTime -> LentilleStream es Changes -> LentilleStream es Changes
+streamDropBefore untilDate = fmap (pure ()) . S.break (isChangeTooOld untilDate)
+
+-- | Return False to keep the stream element.
 isChangeTooOld :: UTCTime -> Either LentilleError (Change, [ChangeEvent]) -> Bool
-isChangeTooOld _ (Left _) = True
-isChangeTooOld date (Right (change, _)) =
+isChangeTooOld _ (Left _) = False
+isChangeTooOld untilDate (Right (change, _)) =
   case changeUpdatedAt change of
-    Just changeDate -> T.toUTCTime changeDate < date
-    _ -> True
+    Just changeDate -> T.toUTCTime changeDate < untilDate
+    _ -> False
 
 swapDuration :: ChangeOptionalDuration -> ChangeEventOptionalDuration
 swapDuration (ChangeOptionalDurationDuration v) = ChangeEventOptionalDurationDuration v

src/Lentille/GitHub/PullRequests.hs

@@ -14,7 +14,6 @@ import Lentille.GitHub.Utils
 import Lentille.GraphQL
 import Monocle.Prelude hiding (id, state)
 import Monocle.Protob.Change
-import Streaming.Prelude qualified as S (break)
 
 -- https://docs.github.com/en/graphql/reference/queries#repository
 declareLocalTypesInline
@@ -52,15 +51,12 @@ streamPullRequests ::
   Text ->
   LentilleStream es Changes
 streamPullRequests client cb untilDate repoFullname =
-  breakOnDate $ streamFetch client mkArgs optParams transformResponse'
+  streamDropBefore untilDate $ streamFetch client mkArgs optParams transformResponse'
  where
   org = Data.Text.takeWhile (/= '/') repoFullname
   repo = Data.Text.takeWhileEnd (/= '/') repoFullname
   mkArgs = GetProjectPullRequestsArgs org repo
   transformResponse' = transformResponse (getHost client) cb
-  -- This transform the stream by adding a limit.
-  -- We don't care about the rest so we replace it with ()
-  breakOnDate = fmap (pure ()) . S.break (isChangeTooOld untilDate)
 
 transformResponse ::
   -- hostname of the provider

src/Lentille/GitHub/Types.hs

@@ -7,7 +7,6 @@ module Lentille.GitHub.Types where
 import Data.Morpheus.Client (declareGlobalTypesByName)
 import Lentille.GraphQL (ghSchemaLocation)
 import Monocle.Prelude
-import Monocle.Protob.Change (Change, ChangeEvent)
 
 newtype DateTime = DateTime Text deriving (Show, Eq, FromJSON)
 
@@ -22,5 +21,3 @@ declareGlobalTypesByName
   , "PullRequestState"
   , "PullRequestReviewState"
   ]
-
-type Changes = (Change, [ChangeEvent])

src/Lentille/GitHub/UserPullRequests.hs

@@ -13,7 +13,6 @@ import Lentille.GitHub.Utils
 import Lentille.GraphQL
 import Monocle.Prelude hiding (id, state)
 import Monocle.Protob.Change
-import Streaming.Prelude qualified as S (break)
 
 -- https://docs.github.com/en/graphql/reference/queries#user
 declareLocalTypesInline
@@ -51,13 +50,10 @@ streamUserPullRequests ::
   Text ->
   LentilleStream es Changes
 streamUserPullRequests client cb untilDate userLogin =
-  breakOnDate $ streamFetch client mkArgs optParams transformResponse'
+  streamDropBefore untilDate $ streamFetch client mkArgs optParams transformResponse'
  where
   mkArgs = GetUserPullRequestsArgs userLogin
   transformResponse' = transformResponse (getHost client) cb
-  -- This transform the stream by adding a limit.
-  -- We don't care about the rest so we replace it with ()
-  breakOnDate = fmap (pure ()) . S.break (isChangeTooOld untilDate)
 
 transformResponse ::
   -- hostname of the provider

src/Lentille/GitLab/MergeRequests.hs

@@ -101,8 +101,6 @@ declareLocalTypesInline
     }
   |]
 
-type Changes = (Change, [ChangeEvent])
-
 fetchMergeRequest :: GraphEffects es => GraphClient -> Text -> Text -> Eff es (Either (FetchError GetProjectMergeRequests) GetProjectMergeRequests, [RequestLog])
 fetchMergeRequest client project mrID =
   fetchWithLog (doGraphRequest client) (GetProjectMergeRequestsArgs (ID project) (Just [mrID]) Nothing)
@@ -116,14 +114,9 @@ streamMergeRequests ::
   Text ->
   LentilleStream es Changes
 streamMergeRequests client getIdentIdCb untilDate project =
-  breakOnDate $ streamFetch client mkArgs defaultStreamFetchOptParams transformResponse'
+  streamDropBefore untilDate $ streamFetch client mkArgs defaultStreamFetchOptParams transformResponse'
  where
   mkArgs _ = GetProjectMergeRequestsArgs (ID project) Nothing
-
-  -- This transform the stream by adding a limit.
-  -- We don't care about the rest so we replace it with ()
-  breakOnDate = fmap (pure ()) . S.break (isChangeTooOld untilDate)
-
   transformResponse' = transformResponse (host client) getIdentIdCb
 
 transformResponse ::