| Copyright | (c) 2013-2017 Brendan Hay |
|---|---|
| License | Mozilla Public License, v. 2.0. |
| Maintainer | Brendan Hay <brendan.g.hay+amazonka@gmail.com> |
| Stability | provisional |
| Portability | non-portable (GHC extensions) |
| Safe Haskell | None |
| Language | Haskell2010 |
Network.AWS.Env
- newEnv :: (Applicative m, MonadIO m, MonadCatch m) => Credentials -> m Env
- newEnvWith :: (Applicative m, MonadIO m, MonadCatch m) => Credentials -> Maybe Bool -> Manager -> m Env
- data Env = Env {
- _envRegion :: !Region
- _envLogger :: !Logger
- _envRetryCheck :: !(Int -> HttpException -> Bool)
- _envOverride :: !(Dual (Endo Service))
- _envManager :: !Manager
- _envEC2 :: !(IORef (Maybe Bool))
- _envAuth :: !Auth
- class HasEnv a where
- override :: HasEnv a => (Service -> Service) -> a -> a
- configure :: HasEnv a => Service -> a -> a
- reconfigure :: (MonadReader r m, HasEnv r) => Service -> m a -> m a
- within :: (MonadReader r m, HasEnv r) => Region -> m a -> m a
- once :: (MonadReader r m, HasEnv r) => m a -> m a
- timeout :: (MonadReader r m, HasEnv r) => Seconds -> m a -> m a
- retryConnectionFailure :: Int -> Int -> HttpException -> Bool
Creating the Environment
Arguments
| :: (Applicative m, MonadIO m, MonadCatch m) | |
| => Credentials | Credential discovery mechanism. |
| -> m Env |
Creates a new environment with a new Manager without debug logging
and uses getAuth to expand/discover the supplied Credentials.
Lenses from HasEnv can be used to further configure the resulting Env.
Since: 1.5.0 - The region is now retrieved from the AWS_REGION environment
variable (identical to official SDKs), or defaults to us-east-1.
You can override the Env region by using envRegion, or the current operation's
region by using within.
Since: 1.3.6 - The default logic for retrying HttpExceptions now uses
retryConnectionFailure to retry specific connection failure conditions up to 3 times.
Previously only service specific errors were automatically retried.
This can be reverted to the old behaviour by resetting the Env using
envRetryCheck lens to (\_ _ -> False).
Throws AuthError when environment variables or IAM profiles cannot be read.
See: newEnvWith.
Arguments
| :: (Applicative m, MonadIO m, MonadCatch m) | |
| => Credentials | Credential discovery mechanism. |
| -> Maybe Bool | Preload the EC2 instance check. |
| -> Manager | |
| -> m Env |
The environment containing the parameters required to make AWS requests.
Constructors
| Env | |
Fields
| |
Minimal complete definition
Methods
environment :: Lens' a Env Source #
envRegion :: Lens' a Region Source #
The current region.
envLogger :: Lens' a Logger Source #
The function used to output log messages.
envRetryCheck :: Lens' a (Int -> HttpException -> Bool) Source #
The function used to determine if an HttpException should be retried.
envOverride :: Lens' a (Dual (Endo Service)) Source #
The currently applied overrides to all Service configuration.
envManager :: Lens' a Manager Source #
The Manager used to create and manage open HTTP connections.
envAuth :: Lens' a Auth Source #
The credentials used to sign requests for authentication with AWS.
envEC2 :: Getter a (IORef (Maybe Bool)) Source #
A memoised predicate for whether the underlying host is an EC2 instance.
Overriding Default Configuration
override :: HasEnv a => (Service -> Service) -> a -> a Source #
Provide a function which will be added to the existing stack of overrides applied to all service configuration.
To override a specific service, it's suggested you use
either configure or reconfigure with a modified version of the default
service, such as Network.AWS.DynamoDB.dynamoDB.
configure :: HasEnv a => Service -> a -> a Source #
Configure a specific service. All requests belonging to the supplied service will use this configuration instead of the default.
It's suggested you use a modified version of the default service, such
as Network.AWS.DynamoDB.dynamoDB.
See: reconfigure.
Scoped Actions
reconfigure :: (MonadReader r m, HasEnv r) => Service -> m a -> m a Source #
Scope an action such that all requests belonging to the supplied service will use this configuration instead of the default.
It's suggested you use a modified version of the default service, such
as Network.AWS.DynamoDB.dynamoDB.
See: configure.
within :: (MonadReader r m, HasEnv r) => Region -> m a -> m a Source #
Scope an action within the specific Region.
once :: (MonadReader r m, HasEnv r) => m a -> m a Source #
Scope an action such that any retry logic for the Service is
ignored and any requests will at most be sent once.
timeout :: (MonadReader r m, HasEnv r) => Seconds -> m a -> m a Source #
Scope an action such that any HTTP response will use this timeout value.
Default timeouts are chosen by considering:
- This
timeout, if set. - The related
Servicetimeout for the sent request if set. (Usually 70s) - The
envManagertimeout if set. - The default
ClientRequesttimeout. (Approximately 30s)
Retry HTTP Exceptions
retryConnectionFailure :: Int -> Int -> HttpException -> Bool Source #
Retry the subset of transport specific errors encompassing connection failure up to the specific number of times.