mirror of
https://github.com/hasura/graphql-engine.git
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539 lines
23 KiB
Haskell
539 lines
23 KiB
Haskell
module Hasura.GraphQL.Execute.Action
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( ActionExecuteTx
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, ActionExecuteResult(..)
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, resolveAsyncActionQuery
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, asyncActionsProcessor
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, resolveActionExecution
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, resolveActionMutationAsync
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) where
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import Hasura.Prelude
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import qualified Data.Aeson as J
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import qualified Data.Aeson.Casing as J
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import qualified Data.Aeson.TH as J
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import qualified Data.ByteString.Lazy as BL
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import qualified Data.CaseInsensitive as CI
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import qualified Data.HashMap.Strict as Map
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import qualified Data.HashSet as Set
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import qualified Data.Text as T
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import qualified Data.UUID as UUID
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import qualified Database.PG.Query as Q
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import qualified Language.GraphQL.Draft.Syntax as G
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import qualified Network.HTTP.Client as HTTP
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import qualified Network.HTTP.Types as HTTP
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import qualified Network.Wreq as Wreq
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import Control.Concurrent (threadDelay)
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import Control.Exception (try)
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import Control.Lens
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import Data.Has
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import Data.IORef
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import Data.Int (Int64)
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import Data.Text.Extended
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import qualified Hasura.RQL.DML.RemoteJoin as RJ
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import qualified Hasura.RQL.DML.Select as RS
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-- import qualified Hasura.GraphQL.Resolve.Select as GRS
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import Control.Monad.Trans.Control (MonadBaseControl)
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import qualified Control.Concurrent.Async.Lifted.Safe as LA
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import qualified Data.Environment as Env
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import qualified Hasura.Logging as L
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import qualified Hasura.Tracing as Tracing
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import Hasura.Backends.Postgres.SQL.Types
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import Hasura.Backends.Postgres.SQL.Value (PGScalarValue (..), toTxtValue)
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import Hasura.EncJSON
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import Hasura.GraphQL.Execute.Prepare
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import Hasura.GraphQL.Parser hiding (column)
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import Hasura.GraphQL.Utils (showNames)
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import Hasura.HTTP
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import Hasura.RQL.DDL.Headers
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import Hasura.RQL.DDL.Schema.Cache
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import Hasura.RQL.DML.Select (asSingleRowJsonResp)
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import Hasura.RQL.Types
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import Hasura.RQL.Types.Run
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import Hasura.SQL.Types
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import Hasura.Server.Utils (mkClientHeadersForward, mkSetCookieHeaders)
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import Hasura.Server.Version (HasVersion)
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import Hasura.Session
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type ActionExecuteTx =
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forall tx. (MonadIO tx, MonadTx tx, Tracing.MonadTrace tx) => tx EncJSON
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newtype ActionContext
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= ActionContext {_acName :: ActionName}
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deriving (Show, Eq)
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$(J.deriveJSON (J.aesonDrop 3 J.snakeCase) ''ActionContext)
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data ActionWebhookPayload
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= ActionWebhookPayload
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{ _awpAction :: !ActionContext
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, _awpSessionVariables :: !SessionVariables
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, _awpInput :: !J.Value
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} deriving (Show, Eq)
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$(J.deriveJSON (J.aesonDrop 4 J.snakeCase) ''ActionWebhookPayload)
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data ActionWebhookErrorResponse
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= ActionWebhookErrorResponse
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{ _awerMessage :: !Text
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, _awerCode :: !(Maybe Text)
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} deriving (Show, Eq)
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$(J.deriveJSON (J.aesonDrop 5 J.snakeCase) ''ActionWebhookErrorResponse)
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data ActionWebhookResponse
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= AWRArray ![Map.HashMap G.Name J.Value]
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| AWRObject !(Map.HashMap G.Name J.Value)
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deriving (Show, Eq)
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instance J.FromJSON ActionWebhookResponse where
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parseJSON v = case v of
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J.Array{} -> AWRArray <$> J.parseJSON v
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J.Object{} -> AWRObject <$> J.parseJSON v
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_ -> fail $ "expecting object or array of objects for action webhook response"
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instance J.ToJSON ActionWebhookResponse where
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toJSON (AWRArray objects) = J.toJSON objects
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toJSON (AWRObject obj) = J.toJSON obj
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data ActionRequestInfo
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= ActionRequestInfo
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{ _areqiUrl :: !Text
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, _areqiBody :: !J.Value
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, _areqiHeaders :: ![HeaderConf]
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} deriving (Show, Eq)
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$(J.deriveToJSON (J.aesonDrop 6 J.snakeCase) ''ActionRequestInfo)
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data ActionResponseInfo
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= ActionResponseInfo
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{ _aresiStatus :: !Int
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, _aresiBody :: !J.Value
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, _aresiHeaders :: ![HeaderConf]
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} deriving (Show, Eq)
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$(J.deriveToJSON (J.aesonDrop 6 J.snakeCase) ''ActionResponseInfo)
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data ActionInternalError
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= ActionInternalError
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{ _aieError :: !J.Value
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, _aieRequest :: !ActionRequestInfo
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, _aieResponse :: !(Maybe ActionResponseInfo)
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} deriving (Show, Eq)
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$(J.deriveToJSON (J.aesonDrop 4 J.snakeCase) ''ActionInternalError)
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-- * Action handler logging related
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data ActionHandlerLog
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= ActionHandlerLog
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{ _ahlRequestSize :: !Int64
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, _ahlResponseSize :: !Int64
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} deriving (Show)
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$(J.deriveJSON (J.aesonDrop 4 J.snakeCase){J.omitNothingFields=True} ''ActionHandlerLog)
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instance L.ToEngineLog ActionHandlerLog L.Hasura where
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toEngineLog ahl = (L.LevelInfo, L.ELTActionHandler, J.toJSON ahl)
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data ActionExecuteResult
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= ActionExecuteResult
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{ _aerTransaction :: !ActionExecuteTx
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, _aerHeaders :: !HTTP.ResponseHeaders
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}
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-- | Synchronously execute webhook handler and resolve response to action "output"
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resolveActionExecution
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:: ( HasVersion
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, MonadError QErr m
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, MonadIO m
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, Tracing.MonadTrace m
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)
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=> Env.Environment
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-> L.Logger L.Hasura
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-> UserInfo
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-> AnnActionExecution 'Postgres UnpreparedValue
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-> ActionExecContext
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-> m ActionExecuteResult
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resolveActionExecution env logger userInfo annAction execContext = do
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let actionContext = ActionContext actionName
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handlerPayload = ActionWebhookPayload actionContext sessionVariables inputPayload
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(webhookRes, respHeaders) <- flip runReaderT logger $ callWebhook env manager outputType outputFields reqHeaders confHeaders
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forwardClientHeaders resolvedWebhook handlerPayload timeout
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let webhookResponseExpression = RS.AEInput $ UVLiteral $
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toTxtValue $ WithScalarType PGJSONB $ PGValJSONB $ Q.JSONB $ J.toJSON webhookRes
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selectAstUnresolved = processOutputSelectionSet webhookResponseExpression
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outputType definitionList annFields stringifyNum
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(astResolved, _expectedVariables) <- flip runStateT Set.empty $ RS.traverseAnnSimpleSelect prepareWithoutPlan selectAstUnresolved
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return $ ActionExecuteResult (executeAction astResolved) respHeaders
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where
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AnnActionExecution actionName outputType annFields inputPayload
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outputFields definitionList resolvedWebhook confHeaders
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forwardClientHeaders stringifyNum timeout = annAction
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ActionExecContext manager reqHeaders sessionVariables = execContext
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executeAction :: RS.AnnSimpleSel 'Postgres -> ActionExecuteTx
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executeAction astResolved = do
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let (astResolvedWithoutRemoteJoins,maybeRemoteJoins) = RJ.getRemoteJoins astResolved
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jsonAggType = mkJsonAggSelect outputType
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case maybeRemoteJoins of
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Just remoteJoins ->
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let query = Q.fromBuilder $ toSQL $
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RS.mkSQLSelect jsonAggType astResolvedWithoutRemoteJoins
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in RJ.executeQueryWithRemoteJoins env manager reqHeaders userInfo query [] remoteJoins
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Nothing ->
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liftTx $ asSingleRowJsonResp (Q.fromBuilder $ toSQL $ RS.mkSQLSelect jsonAggType astResolved) []
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{- Note: [Async action architecture]
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In async actions, acquiring the action result is deferred. The async action mutation is made to
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initiate the action which returns an UUID. The UUID is used to query/subsribe for actions response.
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On mutation, the server makes an action log record in hdb_catalog.hdb_action_log table with request headers
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and input arguments. The `asyncActionsProcessor` background thread processes the async actions by executing
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the webhook handler and writing back the response payload or errors if any in the database.
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When an async action query/subscription is made, the server fetches the relavent data from the hdb_action_log
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table provides the action response. See Note [Resolving async action query/subscription] below.
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-}
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-- | Resolve asynchronous action mutation which returns only the action uuid
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resolveActionMutationAsync
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:: ( MonadError QErr m
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, MonadTx tx
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)
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=> AnnActionMutationAsync
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-> [HTTP.Header]
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-> SessionVariables
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-> m (tx EncJSON)
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resolveActionMutationAsync annAction reqHeaders sessionVariables = do
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pure $ liftTx do
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actionId <- runIdentity . Q.getRow <$> Q.withQE defaultTxErrorHandler [Q.sql|
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INSERT INTO
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"hdb_catalog"."hdb_action_log"
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("action_name", "session_variables", "request_headers", "input_payload", "status")
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VALUES
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($1, $2, $3, $4, $5)
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RETURNING "id"
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|]
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(actionName, Q.AltJ sessionVariables, Q.AltJ $ toHeadersMap reqHeaders, Q.AltJ inputArgs, "created"::Text) False
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pure $ encJFromJValue $ UUID.toText actionId
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where
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AnnActionMutationAsync actionName inputArgs = annAction
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toHeadersMap = Map.fromList . map ((bsToTxt . CI.original) *** bsToTxt)
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{- Note: [Resolving async action query/subscription]
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Resolving async action query involves in selecting fields from hdb_catalog.hdb_action_log table.
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See Note [Async action architecture] above. See the table's Postgres schema in src-rsr/initialise.sql.
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The webhook's response JSON stored in "response_payload" column has to be fetched as "output"
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along with relationships (if any) to other tables. The in-built pg_catalog function `jsonb_to_record`
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helps in converting any JSON object to Postgres record type. Thus generated record is used to resolve
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action's type. Here, we treat the "output" field as a computed field to hdb_action_log table with
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`jsonb_to_record` as custom SQL function.
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-}
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-- TODO: Add tracing here? Avoided now because currently the function is pure
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resolveAsyncActionQuery
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:: UserInfo
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-> AnnActionAsyncQuery 'Postgres UnpreparedValue
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-> RS.AnnSimpleSelG 'Postgres UnpreparedValue
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resolveAsyncActionQuery userInfo annAction =
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let annotatedFields = asyncFields <&> second \case
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AsyncTypename t -> RS.AFExpression t
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AsyncOutput annFields ->
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-- See Note [Resolving async action query/subscription]
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let inputTableArgument = RS.AETableRow $ Just $ Identifier "response_payload"
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jsonAggSelect = mkJsonAggSelect outputType
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in RS.AFComputedField $ RS.CFSTable jsonAggSelect $
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processOutputSelectionSet inputTableArgument outputType
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definitionList annFields stringifyNumerics
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AsyncId -> mkAnnFldFromPGCol "id" PGUUID
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AsyncCreatedAt -> mkAnnFldFromPGCol "created_at" PGTimeStampTZ
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AsyncErrors -> mkAnnFldFromPGCol "errors" PGJSONB
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tableFromExp = RS.FromTable actionLogTable
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tableArguments = RS.noSelectArgs
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{ RS._saWhere = Just tableBoolExpression}
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tablePermissions = RS.TablePerm annBoolExpTrue Nothing
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in RS.AnnSelectG annotatedFields tableFromExp tablePermissions
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tableArguments stringifyNumerics
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where
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AnnActionAsyncQuery actionName actionId outputType asyncFields definitionList stringifyNumerics = annAction
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actionLogTable = QualifiedObject (SchemaName "hdb_catalog") (TableName "hdb_action_log")
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-- TODO (from master):- Avoid using ColumnInfo
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mkAnnFldFromPGCol column' columnType =
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flip RS.mkAnnColumnField Nothing $
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ColumnInfo (unsafePGCol column') (G.unsafeMkName column') 0 (PGColumnScalar columnType) True Nothing
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tableBoolExpression =
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let actionIdColumnInfo = ColumnInfo (unsafePGCol "id") $$(G.litName "id")
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0 (PGColumnScalar PGUUID) False Nothing
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actionIdColumnEq = BoolFld $ AVCol actionIdColumnInfo [AEQ True actionId]
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sessionVarsColumnInfo = ColumnInfo (unsafePGCol "session_variables") $$(G.litName "session_variables")
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0 (PGColumnScalar PGJSONB) False Nothing
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sessionVarValue = flip UVParameter Nothing $ PGColumnValue (PGColumnScalar PGJSONB) $
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WithScalarType PGJSONB $ PGValJSONB $ Q.JSONB $ J.toJSON $ _uiSession userInfo
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sessionVarsColumnEq = BoolFld $ AVCol sessionVarsColumnInfo [AEQ True sessionVarValue]
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-- For non-admin roles, accessing an async action's response should be allowed only for the user
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-- who initiated the action through mutation. The action's response is accessible for a query/subscription
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-- only when it's session variables are equal to that of action's.
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in if isAdmin (_uiRole userInfo) then actionIdColumnEq
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else BoolAnd [actionIdColumnEq, sessionVarsColumnEq]
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data ActionLogItem
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= ActionLogItem
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{ _aliId :: !UUID.UUID
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, _aliActionName :: !ActionName
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, _aliRequestHeaders :: ![HTTP.Header]
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, _aliSessionVariables :: !SessionVariables
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, _aliInputPayload :: !J.Value
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} deriving (Show, Eq)
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-- | Process async actions from hdb_catalog.hdb_action_log table. This functions is executed in a background thread.
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-- See Note [Async action architecture] above
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asyncActionsProcessor
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:: forall m void
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. ( HasVersion
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, MonadIO m
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, MonadBaseControl IO m
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, LA.Forall (LA.Pure m)
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, Tracing.HasReporter m
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)
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=> Env.Environment
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-> L.Logger L.Hasura
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-> IORef (RebuildableSchemaCache Run, SchemaCacheVer)
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-> Q.PGPool
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-> HTTP.Manager
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-> m void
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asyncActionsProcessor env logger cacheRef pgPool httpManager = forever $ do
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asyncInvocations <- liftIO getUndeliveredEvents
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actionCache <- scActions . lastBuiltSchemaCache . fst <$> liftIO (readIORef cacheRef)
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LA.mapConcurrently_ (callHandler actionCache) asyncInvocations
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liftIO $ threadDelay (1 * 1000 * 1000)
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where
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runTx :: (Monoid a) => Q.TxE QErr a -> IO a
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runTx q = do
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res <- runExceptT $ Q.runTx' pgPool q
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either mempty return res
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callHandler :: ActionCache -> ActionLogItem -> m ()
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callHandler actionCache actionLogItem = Tracing.runTraceT "async actions processor" do
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let ActionLogItem actionId actionName reqHeaders
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sessionVariables inputPayload = actionLogItem
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case Map.lookup actionName actionCache of
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Nothing -> return ()
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Just actionInfo -> do
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let definition = _aiDefinition actionInfo
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outputFields = getActionOutputFields $ _aiOutputObject actionInfo
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webhookUrl = _adHandler definition
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forwardClientHeaders = _adForwardClientHeaders definition
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confHeaders = _adHeaders definition
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timeout = _adTimeout definition
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outputType = _adOutputType definition
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actionContext = ActionContext actionName
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eitherRes <- runExceptT $ flip runReaderT logger $
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callWebhook env httpManager outputType outputFields reqHeaders confHeaders
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forwardClientHeaders webhookUrl (ActionWebhookPayload actionContext sessionVariables inputPayload)
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timeout
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liftIO $ case eitherRes of
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Left e -> setError actionId e
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Right (responsePayload, _) -> setCompleted actionId $ J.toJSON responsePayload
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setError :: UUID.UUID -> QErr -> IO ()
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setError actionId e =
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runTx $ setErrorQuery actionId e
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setErrorQuery
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:: UUID.UUID -> QErr -> Q.TxE QErr ()
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setErrorQuery actionId e =
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Q.unitQE defaultTxErrorHandler [Q.sql|
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update hdb_catalog.hdb_action_log
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set errors = $1, status = 'error'
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where id = $2
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|] (Q.AltJ e, actionId) False
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setCompleted :: UUID.UUID -> J.Value -> IO ()
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setCompleted actionId responsePayload =
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runTx $ setCompletedQuery actionId responsePayload
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setCompletedQuery
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:: UUID.UUID -> J.Value -> Q.TxE QErr ()
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setCompletedQuery actionId responsePayload =
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Q.unitQE defaultTxErrorHandler [Q.sql|
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update hdb_catalog.hdb_action_log
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set response_payload = $1, status = 'completed'
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where id = $2
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|] (Q.AltJ responsePayload, actionId) False
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undeliveredEventsQuery
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:: Q.TxE QErr [ActionLogItem]
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undeliveredEventsQuery =
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map mapEvent <$> Q.listQE defaultTxErrorHandler [Q.sql|
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update hdb_catalog.hdb_action_log set status = 'processing'
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where
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id in (
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select id from hdb_catalog.hdb_action_log
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where status = 'created'
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for update skip locked limit 10
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)
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returning
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id, action_name, request_headers::json, session_variables::json, input_payload::json
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|] () False
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where
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mapEvent (actionId, actionName, Q.AltJ headersMap,
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Q.AltJ sessionVariables, Q.AltJ inputPayload) =
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ActionLogItem actionId actionName (fromHeadersMap headersMap) sessionVariables inputPayload
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fromHeadersMap = map ((CI.mk . txtToBs) *** txtToBs) . Map.toList
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getUndeliveredEvents = runTx undeliveredEventsQuery
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callWebhook
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:: forall m r.
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( HasVersion
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, MonadIO m
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, MonadError QErr m
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, Tracing.MonadTrace m
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, MonadReader r m
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, Has (L.Logger L.Hasura) r
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)
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=> Env.Environment
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-> HTTP.Manager
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-> GraphQLType
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-> ActionOutputFields
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-> [HTTP.Header]
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-> [HeaderConf]
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-> Bool
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-> ResolvedWebhook
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-> ActionWebhookPayload
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-> Timeout
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-> m (ActionWebhookResponse, HTTP.ResponseHeaders)
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callWebhook env manager outputType outputFields reqHeaders confHeaders
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forwardClientHeaders resolvedWebhook actionWebhookPayload timeoutSeconds = do
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resolvedConfHeaders <- makeHeadersFromConf env confHeaders
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let clientHeaders = if forwardClientHeaders then mkClientHeadersForward reqHeaders else []
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contentType = ("Content-Type", "application/json")
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-- Using HashMap to avoid duplicate headers between configuration headers
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-- and client headers where configuration headers are preferred
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hdrs = contentType : (Map.toList . Map.fromList) (resolvedConfHeaders <> clientHeaders)
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postPayload = J.toJSON actionWebhookPayload
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requestBody = J.encode postPayload
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requestBodySize = BL.length requestBody
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url = unResolvedWebhook resolvedWebhook
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responseTimeout = HTTP.responseTimeoutMicro $ (unTimeout timeoutSeconds) * 1000000
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httpResponse <- do
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initReq <- liftIO $ HTTP.parseRequest (T.unpack url)
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let req = initReq { HTTP.method = "POST"
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, HTTP.requestHeaders = addDefaultHeaders hdrs
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, HTTP.requestBody = HTTP.RequestBodyLBS requestBody
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, HTTP.responseTimeout = responseTimeout
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}
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Tracing.tracedHttpRequest req \req' ->
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liftIO . try $ HTTP.httpLbs req' manager
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let requestInfo = ActionRequestInfo url postPayload $
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confHeaders <> toHeadersConf clientHeaders
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case httpResponse of
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Left e ->
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throw500WithDetail "http exception when calling webhook" $
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J.toJSON $ ActionInternalError (J.toJSON $ HttpException e) requestInfo Nothing
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Right responseWreq -> do
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let responseBody = responseWreq ^. Wreq.responseBody
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responseBodySize = BL.length responseBody
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responseStatus = responseWreq ^. Wreq.responseStatus
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mkResponseInfo respBody =
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ActionResponseInfo (HTTP.statusCode responseStatus) respBody $
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toHeadersConf $ responseWreq ^. Wreq.responseHeaders
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-- log the request and response to/from the action handler
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logger :: (L.Logger L.Hasura) <- asks getter
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L.unLogger logger $ ActionHandlerLog requestBodySize responseBodySize
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case J.eitherDecode responseBody of
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Left e -> do
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let responseInfo = mkResponseInfo $ J.String $ bsToTxt $ BL.toStrict responseBody
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throw500WithDetail "not a valid json response from webhook" $ J.toJSON $
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ActionInternalError (J.toJSON $ "invalid json: " <> e) requestInfo $ Just responseInfo
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Right responseValue -> do
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let responseInfo = mkResponseInfo responseValue
|
|
addInternalToErr e =
|
|
let actionInternalError = J.toJSON $
|
|
ActionInternalError (J.String "unexpected response") requestInfo $ Just responseInfo
|
|
in e{qeInternal = Just actionInternalError}
|
|
|
|
if | HTTP.statusIsSuccessful responseStatus -> do
|
|
let expectingArray = isListType outputType
|
|
modifyQErr addInternalToErr $ do
|
|
webhookResponse <- decodeValue responseValue
|
|
case webhookResponse of
|
|
AWRArray objs -> do
|
|
when (not expectingArray) $
|
|
throwUnexpected "expecting object for action webhook response but got array"
|
|
mapM_ validateResponseObject objs
|
|
AWRObject obj -> do
|
|
when expectingArray $
|
|
throwUnexpected "expecting array for action webhook response but got object"
|
|
validateResponseObject obj
|
|
pure (webhookResponse, mkSetCookieHeaders responseWreq)
|
|
|
|
| HTTP.statusIsClientError responseStatus -> do
|
|
ActionWebhookErrorResponse message maybeCode <-
|
|
modifyQErr addInternalToErr $ decodeValue responseValue
|
|
let code = maybe Unexpected ActionWebhookCode maybeCode
|
|
qErr = QErr [] responseStatus message code Nothing
|
|
throwError qErr
|
|
|
|
| otherwise -> do
|
|
let err = J.toJSON $ "expecting 2xx or 4xx status code, but found "
|
|
++ show (HTTP.statusCode responseStatus)
|
|
throw500WithDetail "internal error" $ J.toJSON $
|
|
ActionInternalError err requestInfo $ Just responseInfo
|
|
where
|
|
throwUnexpected = throw400 Unexpected
|
|
|
|
-- Webhook response object should conform to action output fields
|
|
validateResponseObject obj = do
|
|
-- Fields not specified in the output type shouldn't be present in the response
|
|
let extraFields = filter (not . flip Map.member outputFields) $ Map.keys obj
|
|
when (not $ null extraFields) $ throwUnexpected $
|
|
"unexpected fields in webhook response: " <> showNames extraFields
|
|
|
|
void $ flip Map.traverseWithKey outputFields $ \fieldName fieldTy ->
|
|
-- When field is non-nullable, it has to present in the response with no null value
|
|
when (not $ G.isNullable fieldTy) $ case Map.lookup fieldName obj of
|
|
Nothing -> throwUnexpected $
|
|
"field " <> fieldName <<> " expected in webhook response, but not found"
|
|
Just v -> when (v == J.Null) $ throwUnexpected $
|
|
"expecting not null value for field " <>> fieldName
|
|
|
|
mkJsonAggSelect :: GraphQLType -> RS.JsonAggSelect
|
|
mkJsonAggSelect =
|
|
bool RS.JASSingleObject RS.JASMultipleRows . isListType
|
|
|
|
processOutputSelectionSet
|
|
:: RS.ArgumentExp v
|
|
-> GraphQLType
|
|
-> [(Column backend, ScalarType backend)]
|
|
-> RS.AnnFieldsG backend v
|
|
-> Bool
|
|
-> RS.AnnSimpleSelG backend v
|
|
processOutputSelectionSet tableRowInput actionOutputType definitionList annotatedFields =
|
|
RS.AnnSelectG annotatedFields selectFrom RS.noTablePermissions RS.noSelectArgs
|
|
where
|
|
jsonbToPostgresRecordFunction =
|
|
QualifiedObject "pg_catalog" $ FunctionName $
|
|
if isListType actionOutputType then
|
|
"jsonb_to_recordset" -- Multirow array response
|
|
else "jsonb_to_record" -- Single object response
|
|
|
|
functionArgs = RS.FunctionArgsExp [tableRowInput] mempty
|
|
selectFrom = RS.FromFunction jsonbToPostgresRecordFunction functionArgs $ Just definitionList
|