{-# LANGUAGE TemplateHaskell #-}
-- | Errors raised by functions in Preql.Wire

module Preql.Wire.Errors where

import Preql.Imports
import Preql.Wire.Orphans ()

import Data.Aeson.TH (defaultOptions, deriveJSON)

import qualified Database.PostgreSQL.LibPQ as PQ

-- | Errors that can occur in decoding a single field.
data UnlocatedFieldError
    = UnexpectedNull
    | ParseFailure Text
    deriving (UnlocatedFieldError -> UnlocatedFieldError -> Bool
(UnlocatedFieldError -> UnlocatedFieldError -> Bool)
-> (UnlocatedFieldError -> UnlocatedFieldError -> Bool)
-> Eq UnlocatedFieldError
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/= :: UnlocatedFieldError -> UnlocatedFieldError -> Bool
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Eq, Int -> UnlocatedFieldError -> ShowS
[UnlocatedFieldError] -> ShowS
UnlocatedFieldError -> String
(Int -> UnlocatedFieldError -> ShowS)
-> (UnlocatedFieldError -> String)
-> ([UnlocatedFieldError] -> ShowS)
-> Show UnlocatedFieldError
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showList :: [UnlocatedFieldError] -> ShowS
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showsPrec :: Int -> UnlocatedFieldError -> ShowS
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$(deriveJSON defaultOptions ''UnlocatedFieldError)

-- | A decoding error with information about the row & column of the result where it
-- occured.
data FieldError = FieldError
    { FieldError -> Int
errorRow :: Int
    , FieldError -> Int
errorColumn :: Int
    , FieldError -> UnlocatedFieldError
failure :: UnlocatedFieldError
    } deriving (FieldError -> FieldError -> Bool
(FieldError -> FieldError -> Bool)
-> (FieldError -> FieldError -> Bool) -> Eq FieldError
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/= :: FieldError -> FieldError -> Bool
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Eq, Int -> FieldError -> ShowS
[FieldError] -> ShowS
FieldError -> String
(Int -> FieldError -> ShowS)
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instance Exception FieldError
$(deriveJSON defaultOptions ''FieldError)

data PgType = Oid PQ.Oid -- ^ A Postgres type with a known ID
    | TypeName Text -- ^ A Postgres type which we will need to lookup by name
    deriving (PgType -> PgType -> Bool
(PgType -> PgType -> Bool)
-> (PgType -> PgType -> Bool) -> Eq PgType
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: PgType -> PgType -> Bool
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Eq, Int -> PgType -> ShowS
[PgType] -> ShowS
PgType -> String
(Int -> PgType -> ShowS)
-> (PgType -> String) -> ([PgType] -> ShowS) -> Show PgType
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showsPrec :: Int -> PgType -> ShowS
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$(deriveJSON defaultOptions ''PgType)

data TypeMismatch = TypeMismatch
    { TypeMismatch -> PgType
expected :: PgType
    , TypeMismatch -> Oid
actual :: PQ.Oid
    , TypeMismatch -> Int
column :: Int
    , TypeMismatch -> Maybe Text
columnName :: Maybe Text
    } deriving (TypeMismatch -> TypeMismatch -> Bool
(TypeMismatch -> TypeMismatch -> Bool)
-> (TypeMismatch -> TypeMismatch -> Bool) -> Eq TypeMismatch
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
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== :: TypeMismatch -> TypeMismatch -> Bool
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Eq, Int -> TypeMismatch -> ShowS
[TypeMismatch] -> ShowS
TypeMismatch -> String
(Int -> TypeMismatch -> ShowS)
-> (TypeMismatch -> String)
-> ([TypeMismatch] -> ShowS)
-> Show TypeMismatch
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$(deriveJSON defaultOptions ''TypeMismatch)

data QueryError
    = ConnectionError Text
    | DecoderError FieldError
    | PgTypeMismatch [TypeMismatch]
    deriving (QueryError -> QueryError -> Bool
(QueryError -> QueryError -> Bool)
-> (QueryError -> QueryError -> Bool) -> Eq QueryError
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: QueryError -> QueryError -> Bool
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== :: QueryError -> QueryError -> Bool
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Eq, Int -> QueryError -> ShowS
[QueryError] -> ShowS
QueryError -> String
(Int -> QueryError -> ShowS)
-> (QueryError -> String)
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instance Exception QueryError
$(deriveJSON defaultOptions ''QueryError)