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- Added System.Environment.Lookup and System.Environment.LookupSpec to
core
- Removed common parts from
- Cardano.Environment.HttpBridge
- Cardano.Environment.HttpBridgeSpec
- Cardano.Environment.Jormungandr
- Cardano.Environment.JormungandrSpec (added)- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| {-# LANGUAGE LambdaCase #-} | ||
| {-# LANGUAGE TypeApplications #-} | ||
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| -- | Helpers for reading ENV vars using 'unsafePerformIO' with readable error | ||
| -- messages. | ||
| -- | ||
| -- Copyright: © 2018-2019 IOHK | ||
| -- License: MIT | ||
| -- | ||
| module Cardano.Environment | ||
| ( | ||
| ErrMissingOrInvalidEnvVar(..) | ||
| , unsafeLookupEnv | ||
| ) where | ||
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| import Prelude | ||
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| import Control.Exception | ||
| ( Exception (..), throwIO ) | ||
| import Data.Text | ||
| ( Text ) | ||
| import Data.Text.Class | ||
| ( FromText (..), TextDecodingError (..) ) | ||
| import Fmt | ||
| ( Buildable (..), nameF, padLeftF, pretty ) | ||
| import System.Environment | ||
| ( getProgName, lookupEnv ) | ||
| import System.IO.Unsafe | ||
| ( unsafePerformIO ) | ||
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| import qualified Data.Text as T | ||
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| -- | Fatal exception thrown when a required ENV var is missing upon start-up. | ||
| data ErrMissingOrInvalidEnvVar = ErrMissingOrInvalidEnvVar | ||
| { name :: String | ||
| , command :: String | ||
| , additionalContext :: Maybe (String, TextDecodingError) | ||
| } | ||
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| instance Show ErrMissingOrInvalidEnvVar where | ||
| show = displayException | ||
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| -- | Produces a nice terminal output so that the error is very readable. | ||
| -- | ||
| -- @ | ||
| -- $ NETWORK=patate cardano-wallet-launcher | ||
| -- Starting... | ||
| -- cardano-wallet-launcher: Missing or invalid ENV var: | ||
| -- | ||
| -- ENV[NETWORK] = patate | ||
| -- | | ||
| -- | | ||
| -- *--> patate is neither "mainnet", "testnet" nor "staging" | ||
| -- | ||
| -- @ | ||
| -- | ||
| -- @ | ||
| -- $ cardano-wallet-launcher | ||
| -- Starting... | ||
| -- cardano-wallet-launcher: Missing or invalid ENV var: | ||
| -- | ||
| -- ENV[NETWORK] = ? | ||
| -- | ||
| -- What about trying to provide a valid ENV var `NETWORK=value cardano-wallet-launcher` ? | ||
| -- @ | ||
| instance Exception ErrMissingOrInvalidEnvVar where | ||
| displayException (ErrMissingOrInvalidEnvVar n cmd ctx) = pretty $ mempty | ||
| <> nameF "Missing or invalid ENV var" | ||
| ( "\n ENV[" <> build n <> "] = " <> ctxF ) | ||
| where | ||
| ctxF = case ctx of | ||
| Nothing -> "?" | ||
| <> "\n\nWhat about trying to provide a valid ENV var " | ||
| <> "`" <> build n <> "=value " <> build cmd <> "` ?" | ||
| Just (v, err) -> | ||
| let | ||
| pad = length n + (length v `div` 2) + 11 | ||
| in | ||
| build v | ||
| <> "\n " <> padLeftF @Text pad ' ' "| " | ||
| <> "\n " <> padLeftF @Text pad ' ' "| " | ||
| <> "\n " <> padLeftF @Text pad ' ' "*--> " | ||
| <> build err | ||
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| -- | Lookup the environment for a given variable | ||
| unsafeLookupEnv | ||
| :: FromText a | ||
| => String | ||
| -> a | ||
| unsafeLookupEnv k = unsafePerformIO $ do | ||
| cmd <- getProgName | ||
| v <- lookupEnv k >>= \case | ||
| Just v -> return v | ||
| Nothing -> throwIO $ ErrMissingOrInvalidEnvVar | ||
| { name = k | ||
| , command = cmd | ||
| , additionalContext = Nothing | ||
| } | ||
| case fromText (T.pack v) of | ||
| Right a -> return a | ||
| Left err -> throwIO $ ErrMissingOrInvalidEnvVar | ||
| { name = k | ||
| , command = cmd | ||
| , additionalContext = Just (v, err) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| {-# LANGUAGE DeriveGeneric #-} | ||
| {-# LANGUAGE LambdaCase #-} | ||
| {-# LANGUAGE ScopedTypeVariables #-} | ||
| {-# LANGUAGE TypeApplications #-} | ||
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| {-# OPTIONS_GHC -fno-warn-orphans #-} | ||
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| module Cardano.EnvironmentSpec | ||
| ( spec | ||
| ) where | ||
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| import Prelude | ||
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| import Cardano.Environment | ||
| ( ErrMissingOrInvalidEnvVar (..), unsafeLookupEnv ) | ||
| import Data.Maybe | ||
| ( isNothing ) | ||
| import Data.Text.Class | ||
| ( FromText (..), TextDecodingError (..), ToText (..) ) | ||
| import GHC.Generics | ||
| ( Generic ) | ||
| import System.Environment | ||
| ( setEnv, unsetEnv ) | ||
| import Test.Hspec | ||
| ( Spec, describe, it, shouldThrow ) | ||
| import Test.QuickCheck | ||
| ( Arbitrary (..) ) | ||
| import Test.QuickCheck.Arbitrary.Generic | ||
| ( genericArbitrary, genericShrink ) | ||
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| import qualified Data.Text as T | ||
|
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| spec :: Spec | ||
| spec = do | ||
| describe "ErrMissingOrInvalidEnvVar (Show / displayException)" $ do | ||
| let errNoAdditionalContext = ErrMissingOrInvalidEnvVar | ||
| { name = "PATATE" | ||
| , command = "my-command" | ||
| , additionalContext = Nothing | ||
| } | ||
| let errWithAdditionalContext = ErrMissingOrInvalidEnvVar | ||
| { name = "PATATE" | ||
| , command = "my-command" | ||
| , additionalContext = Just | ||
| ("💩" | ||
| , TextDecodingError | ||
| { getTextDecodingError = "not a valid value" } | ||
| ) | ||
| } | ||
| it (show errNoAdditionalContext) True | ||
| it (show errWithAdditionalContext) True | ||
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| describe "unsafeLookupEnv" $ do | ||
| it "throws with no context when variable isn't present" $ do | ||
| unsetEnv "PATATE" -- Just in case | ||
| let io = | ||
| unsafeLookupEnv @Network "PATATE" `seq` (return ()) | ||
| let selector (ErrMissingOrInvalidEnvVar n _ c) = | ||
| n == "PATATE" && isNothing c | ||
| io `shouldThrow` selector | ||
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| it "throws with extra context when variable is present but invalid" $ do | ||
| setEnv "PATATE" "not-a-network" | ||
| let ctx = | ||
| ( "not-a-network" | ||
| , TextDecodingError "not-a-network is neither \"mainnet\",\ | ||
| \ \"testnet\" nor \"staging\"." | ||
| ) | ||
| let selector (ErrMissingOrInvalidEnvVar n _ c) = | ||
| n == "PATATE" && c == Just ctx | ||
| let io = | ||
| unsafeLookupEnv @Network "PATATE" `seq` (return ()) | ||
| io `shouldThrow` selector | ||
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| {------------------------------------------------------------------------------- | ||
| Types | ||
| -------------------------------------------------------------------------------} | ||
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| data Network = Mainnet | Testnet | Staging | ||
| deriving Generic | ||
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| instance Arbitrary Network where | ||
| arbitrary = genericArbitrary | ||
| shrink = genericShrink | ||
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| instance FromText Network where | ||
| fromText = \case | ||
| "mainnet" -> Right Mainnet | ||
| "testnet" -> Right Testnet | ||
| "staging" -> Right Staging | ||
| s -> Left $ TextDecodingError $ T.unpack s | ||
| <> " is neither \"mainnet\", \"testnet\" nor \"staging\"." | ||
|
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| instance ToText Network where | ||
| toText = \case | ||
| Mainnet -> "mainnet" | ||
| Testnet -> "testnet" | ||
| Staging -> "staging" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -42,7 +42,6 @@ library | |
| , cryptonite | ||
| , digest | ||
| , exceptions | ||
| , fmt | ||
| , http-api-data | ||
| , http-client | ||
| , http-media | ||
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