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Add allowDiskUse option for aggregates

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Merge pull request #120 from acondolu/allow-disk-use
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Victor Denisov 2021-01-03 20:53:11 -08:00 committed by GitHub
commit 952aed5a1f
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1 changed files with 17 additions and 5 deletions
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22
Database/MongoDB/Query.hs
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@ -1338,16 +1338,28 @@ aggregate :: (MonadIO m, MonadFail m) => Collection -> Pipeline -> Action m [Doc
aggregate aColl agg = do
aggregateCursor aColl agg def >>= rest
data AggregateConfig = AggregateConfig {}
deriving Show
data AggregateConfig = AggregateConfig
{ allowDiskUse :: Bool -- ^ Enable writing to temporary files (aggregations have a 100Mb RAM limit)
}
deriving Show
instance Default AggregateConfig where
def = AggregateConfig {}
def = AggregateConfig
{ allowDiskUse = False
}
aggregateCommand :: Collection -> Pipeline -> AggregateConfig -> Document
aggregateCommand aColl agg AggregateConfig {..} =
[ "aggregate" =: aColl
, "pipeline" =: agg
, "cursor" =: ([] :: Document)
, "allowDiskUse" =: allowDiskUse
]
aggregateCursor :: (MonadIO m, MonadFail m) => Collection -> Pipeline -> AggregateConfig -> Action m Cursor
-- ^ Runs an aggregate and unpacks the result. See <http://docs.mongodb.org/manual/core/aggregation/> for details.
aggregateCursor aColl agg _ = do
response <- runCommand ["aggregate" =: aColl, "pipeline" =: agg, "cursor" =: ([] :: Document)]
aggregateCursor aColl agg cfg = do
response <- runCommand (aggregateCommand aColl agg cfg)
getCursorFromResponse aColl response
>>= either (liftIO . throwIO . AggregateFailure) return