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Merge pull request #321 from input-output-hk/anviking/219/jörmungandr…
…-network-2 `Jormungandr m` with getTipId implementation
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105 changes: 105 additions & 0 deletions
105
lib/jormungandr/src/Cardano/Wallet/Jormungandr/Network.hs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| {-# LANGUAGE DataKinds #-} | ||
| {-# LANGUAGE DuplicateRecordFields #-} | ||
| {-# LANGUAGE GADTs #-} | ||
| {-# LANGUAGE LambdaCase #-} | ||
| {-# LANGUAGE RankNTypes #-} | ||
| {-# LANGUAGE ScopedTypeVariables #-} | ||
| {-# LANGUAGE TypeApplications #-} | ||
|
|
||
| -- | | ||
| -- Copyright: © 2018-2019 IOHK | ||
| -- License: MIT | ||
| -- | ||
| -- | ||
| -- | ||
| -- This module allows the wallet to retrieve blocks from a known @Jormungandr@ | ||
| -- node. This is done by providing a @NetworkLayer@ with some logic building on | ||
| -- top of an underlying @JormungandrLayer@ HTTP client. | ||
| module Cardano.Wallet.Jormungandr.Network | ||
| ( JormungandrLayer (..) | ||
| , mkJormungandrLayer | ||
|
|
||
| -- * Re-export | ||
| , BaseUrl (..) | ||
| , newManager | ||
| , defaultManagerSettings | ||
| , Scheme (..) | ||
| ) where | ||
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| import Prelude | ||
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| import Cardano.Wallet.Jormungandr.Api | ||
| ( BlockId, GetTipId, api ) | ||
| import Cardano.Wallet.Network | ||
| ( ErrNetworkUnreachable (..) ) | ||
| import Control.Exception | ||
| ( Exception ) | ||
| import Control.Monad.Catch | ||
| ( throwM ) | ||
| import Control.Monad.Trans.Except | ||
| ( ExceptT (..) ) | ||
| import Data.Proxy | ||
| ( Proxy (..) ) | ||
| import Network.HTTP.Client | ||
| ( Manager, defaultManagerSettings, newManager ) | ||
| import Servant.Client | ||
| ( BaseUrl (..), ClientM, Scheme (..), client, mkClientEnv, runClientM ) | ||
| import Servant.Client.Core | ||
| ( ServantError (..) ) | ||
| import Servant.Links | ||
| ( Link, safeLink ) | ||
|
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| -- TODO: Implement a NetworkLayer | ||
|
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| {------------------------------------------------------------------------------- | ||
| Jormungandr Client | ||
| -------------------------------------------------------------------------------} | ||
|
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| -- | Endpoints of the jormungandr REST API. | ||
| newtype JormungandrLayer m = JormungandrLayer | ||
| { getTipId | ||
| :: ExceptT ErrNetworkUnreachable m BlockId | ||
| } | ||
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| -- | Construct a 'JormungandrLayer'-client | ||
| -- | ||
| -- >>> mgr <- newManager defaultManagerSettings | ||
| -- >>> j = mkJormungandrLayer mgr (BaseUrl Http "localhost" 8080 "") | ||
| -- >>> runExceptT $ getTipId j | ||
| -- Right (BlockId (Hash {getHash = "26c640a3de09b74398c14ca0a137ec78"})) | ||
| mkJormungandrLayer | ||
| :: Manager -> BaseUrl -> JormungandrLayer IO | ||
| mkJormungandrLayer mgr baseUrl = JormungandrLayer | ||
| { getTipId = ExceptT $ do | ||
| let ctx = safeLink api (Proxy @GetTipId) | ||
| run cGetTipId >>= defaultHandler ctx | ||
| } | ||
| where | ||
| run :: ClientM a -> IO (Either ServantError a) | ||
| run query = runClientM query (mkClientEnv mgr baseUrl) | ||
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| defaultHandler | ||
| :: Link | ||
| -> Either ServantError a | ||
| -> IO (Either ErrNetworkUnreachable a) | ||
| defaultHandler ctx = \case | ||
| Right c -> return $ Right c | ||
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| -- The node has not started yet or has exited. | ||
| -- This could be recovered from by either waiting for the node | ||
| -- initialise, or restarting the node. | ||
| Left (ConnectionError e) -> | ||
| return $ Left $ ErrNetworkUnreachable e | ||
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| -- Other errors (status code, decode failure, invalid content type | ||
| -- headers). These are considered to be programming errors, so crash. | ||
| Left e -> do | ||
| throwM (ErrUnexpectedNetworkFailure ctx e) | ||
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| cGetTipId = client api | ||
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| data ErrUnexpectedNetworkFailure | ||
| = ErrUnexpectedNetworkFailure Link ServantError | ||
| deriving (Show) | ||
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| instance Exception ErrUnexpectedNetworkFailure |