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# Resolver base class. Each resolver represents a different strategy for
# resolving a service name into a list of candidate servers and ports.
#
# @abstract Subclass and override {#resolve} to create a new resolver.
# @api public
class Puppet::HTTP::Resolver
#
# Create a new resolver.
#
# @param [Puppet::HTTP::Client] client
def initialize(client)
@client = client
end
# Return a working server/port for the resolver. This is the base
# implementation and is meant to be a placeholder.
#
# @param [Puppet::HTTP::Session] session
# @param [Symbol] name the service to resolve
# @param [Puppet::SSL::SSLContext] ssl_context (nil) optional ssl context to
# use when creating a connection
# @param [Proc] canceled_handler (nil) optional callback allowing a resolver
# to cancel resolution.
#
# @raise [NotImplementedError] this base class is not implemented
#
# @api public
def resolve(session, name, ssl_context: nil, canceled_handler: nil)
raise NotImplementedError
end
# Check a given connection to establish if it can be relied on for future use.
#
# @param [Puppet::HTTP::Session] session
# @param [Puppet::HTTP::Service] service
# @param [Puppet::SSL::SSLContext] ssl_context
#
# @return [Boolean] Returns true if a connection is successful, false otherwise
#
# @api public
def check_connection?(session, service, ssl_context: nil)
service.connect(ssl_context: ssl_context)
return true
rescue Puppet::HTTP::ConnectionError => e
Puppet.log_exception(e, "Connection to #{service.url} failed, trying next route: #{e.message}")
return false
end
end
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