data FunctionAddress:
  peer_id: string
  service_id: string

data Provider:
  name: string
  url: string

data EVMResult:
  stdout: string
  stderr: string

service MyOp("op"):
  -- identity(x:string) -> string
  array_length(providers: []Provider) -> i64
  -- array_length(nodes: []string) -> i64

service MultiProviderQuery("service-id"):
  get_block_number(provider: Provider) -> EVMResult   

func get_service_id_no_try(node: string, services: []FunctionAddress) -> string:
  res: *string
  for service <- services:
    if service.peer_id == node:
      res <<- service.service_id
  <- res[0]

--func custom_result(out_string: string, err_string: string) -> EVMResult:
--  r: *EVMResult
--  r.stdout <- out_string
--  r.stderr <- err_string
--  <- r

--func custom_num(number: i64) -> i64:
--  num: *i64
--  num <<- number
--  <- num[0]


func get_service_id_try(node: string, services: []FunctionAddress) -> string:
  res: *string
  for service <- services try:
    if service.peer_id == node:
      res <<- service.service_id
  <- res[0]

func get_service_id_par(node: string, services: []FunctionAddress) -> string:
  res: *string
  for service <- services par:
    if service.peer_id == node:
      res <<- service.service_id
  <- res[0]

-- func get_block_number(providers: []Provider, nodes: []string, services: []FunctionAddress) -> []string:
func get_block_number(providers: []Provider, nodes: []string, services: []FunctionAddress) -> []EVMResult:
  -- result: *string
  result: *EVMResult
  for node <- nodes par:
    for provider <- providers par:
      on node:
        service_id <- get_service_id_no_try(node, services)
        MultiProviderQuery service_id
        try:
        -- res <- get_block_number(provider.url)
        -- result <<- (provider.name, node, res)
          result <- MultiProviderQuery.get_block_number(provider)
        -- catch e:
           -- result <- custom_result(e)
  <- result