ouroboros-network-0.16.1.0: A networking layer for the Ouroboros blockchain protocol
Safe HaskellSafe-Inferred
LanguageHaskell2010

Ouroboros.Network.PeerSelection.RootPeersDNS.DNSActions

Synopsis

DNS based actions for local and public root providers

data DNSActions resolver exception m Source #

Dictionary of DNS actions vocabulary

Constructors

DNSActions 

Fields

DNSActions IO

ioDNSActionsDNSLookupTypeDNSActions Resolver IOException IO Source #

IO DNSActions which resolve domain names with Resolver.

The IPv4 and IPv6 addresses the node will be using should determine the LookupReqs so that we can avoid lookups for address types that wont be used.

It guarantees that returned TTLs are strictly greater than 0.

Utils

Resource

newtype Resource m a Source #

Evolving resource; We use it to reinitialise the DNS library if the `etcresolv.conf` file was modified.

Note: constantResource and retryResource are written using a simplified approach inspired by _"The Different Aspects of Monads and Mixins"_, by Bruno C. d S. Oliveira, see https://www.youtube.com/watch?v=pfwP4hXM5hA.

Constructors

Resource 

Fields

Instances

Instances details
Functor m ⇒ Functor (Resource m) Source # 
Instance details

Defined in Ouroboros.Network.PeerSelection.RootPeersDNS.DNSActions

Methods

fmap ∷ (a → b) → Resource m a → Resource m b #

(<$) ∷ a → Resource m b → Resource m a #

retryResource ∷ ∀ m e a. MonadDelay m ⇒ Tracer m e → NonEmpty DiffTimeResource m (Either e a) → Resource m a Source #

A Resource which will exhibit the given Resource but retry it with a given delay until a success. On first success it will reset the delays.

constantResource ∷ ∀ m a. Applicative m ⇒ a → Resource m a Source #

Error type

data DNSorIOError exception Source #

Constructors

DNSError !DNSError 
IOError !exception 

Instances

Instances details
Exception exception ⇒ Exception (DNSorIOError exception) Source # 
Instance details

Defined in Ouroboros.Network.PeerSelection.RootPeersDNS.DNSActions

Show exception ⇒ Show (DNSorIOError exception) Source # 
Instance details

Defined in Ouroboros.Network.PeerSelection.RootPeersDNS.DNSActions

Methods

showsPrecIntDNSorIOError exception → ShowS #

showDNSorIOError exception → String #

showList ∷ [DNSorIOError exception] → ShowS #