module Lnd

# File lib/lnd.rb, line 40
def bin_to_hex(s)
  ap s
  s.each_byte.map { |b| b.to_s(16) }.join
end

# File lib/lnd.rb, line 14
def certificate
  # TODO: READ CERTIFICATE FROM ENV
  File.read(File.expand_path(ENV['lnd_cert']))
end

# File lib/lnd.rb, line 19
def credentials
  GRPC::Core::ChannelCredentials.new(certificate)
end

# File lib/lnd.rb, line 28
def macaroon
  macaroon_binary.each_byte.map { |b| b.to_s(16).rjust(2,'0') }.join
end

# File lib/lnd.rb, line 23
def macaroon_binary
  # TODO: READ  MACA FROM ENV
  File.read(File.expand_path(ENV['lnd_macaroon']))
end

# File lib/lnd.rb, line 6
def protect_call(failed_value, &block)
  begin
    block.call
  rescue => e
    failed_value
  end
end

# File lib/lnd.rb, line 32
def stub
  # TODO: READ THE NODE URL FROM ENV
  Lnrpc::Lightning::Stub.new(ENV['lnd_host'],
                             credentials,
                             interceptors: [MacaroonInterceptor.new(macaroon)])
end