data JsonString:
  value: string
  success: bool
  error: string

service Logger("logger"):
  log(s: []string)

service EthCaller:
  eth_call(uri: string, method: string, json_args: []string) -> JsonString

func call(uri: string, method: string, json_args: []string, serviceId: string) -> JsonString:
  EthCaller serviceId
  on HOST_PEER_ID:
    res <- EthCaller.eth_call(uri, method, json_args)
  <- res