wip: adding proper batching helper

codex/utils/batchutils.nim

@@ -0,0 +1,24 @@
+## Nim-Codex
+## Copyright (c) 2022 Status Research & Development GmbH
+## Licensed under either of
+##  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
+##  * MIT license ([LICENSE-MIT](LICENSE-MIT))
+## at your option.
+## This file may not be copied, modified, or distributed except according to
+## those terms.
+
+import pkg/upraises
+push: {.upraises: [].}
+
+import std/sequtils
+
+template batchIt*[T](elms: openArray[T], batchSize: int, body: untyped) =
+  let
+    batches =
+      (elms.len div batchSize) +
+      (if (elms.len mod batchSize) > 0: 1 else: 0)
+
+  trace "Splitting requests into batches", elements = elms.len, batches = batches, size = batchSize
+  for it {.inject.} in elms.distribute(max(1, batches), spread = false):
+    block:
+      body