From 347e40e30db1442888eacbdf42cf248857df7dbc Mon Sep 17 00:00:00 2001
From: Advaita Saha <adv11sphs@gmail.com>
Date: Fri, 16 Aug 2024 22:50:29 +0530
Subject: [PATCH] inital external sync structure

---
 nimbus/external_sync.nim | 90 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 nimbus/external_sync.nim

diff --git a/nimbus/external_sync.nim b/nimbus/external_sync.nim
new file mode 100644
index 0000000000..0872b94b53
--- /dev/null
+++ b/nimbus/external_sync.nim
@@ -0,0 +1,90 @@
+# Nimbus
+# Copyright (c) 2024 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
+  std/[os, strutils, net],
+  chronicles,
+  ./constants,
+  ./nimbus_desc,
+  ./db/core_db/persistent,
+  ./utils/era_helpers,
+  beacon_chain/spec/eth2_apis/[rest_types, rest_beacon_calls],
+  beacon_chain/networking/network_metadata,
+  eth/async_utils
+
+var running {.volatile.} = true
+
+proc loadBlocksFromBeaconChain(conf: NimbusConf) {.async.} =
+  let coreDB =
+    # Resolve statically for database type
+    case conf.chainDbMode:
+    of Aristo,AriPrune:
+      AristoDbRocks.newCoreDbRef(string conf.dataDir, conf.dbOptions())
+
+  let com = CommonRef.new(
+    db = coreDB,
+    pruneHistory = (conf.chainDbMode == AriPrune),
+    networkId = conf.networkId,
+    params = conf.networkParams)
+
+  defer:
+    com.db.finish()
+
+  let
+    currentBlockNumber = com.db.getSavedStateBlockNumber()
+    chain = com.newChain()
+    clConfig = getMetadataForNetwork("sepolia").cfg
+
+  var 
+    client = RestClientRef.new("http://192.168.29.44:3000").valueOr:
+      error "Cannot connect to server"
+      quit(QuitFailure)
+  
+  let  
+    clHead = 
+      try:
+        awaitWithTimeout(
+            client.getBlockV2(BlockIdent.init(BlockIdentType.Head), clConfig), 
+            30.seconds):
+          error "Failed to get CL head"
+          quit(QuitFailure)
+      except CatchableError as exc:
+        error "Error getting CL head", error = exc.msg
+        quit(QuitFailure)
+
+  if clHead.isSome():
+    let data = clHead.get()[]
+    let blck = data.asTrusted()
+    notice "CL head is available", data
+
+    let elBlock =
+      blck.getEthBlock().valueOr:
+        error "Failed to get Eth block"
+        quit(QuitFailure)
+
+    notice "Eth block", elBlock
+
+
+
+when isMainModule:
+  ## Ctrl+C handling
+  proc controlCHandler() {.noconv.} =
+    when defined(windows):
+      # workaround for https://github.com/nim-lang/Nim/issues/4057
+      setupForeignThreadGc()
+    running = false
+
+  setControlCHook(controlCHandler)
+
+  ## Show logs on stdout until we get the user's logging choice
+  discard defaultChroniclesStream.output.open(stdout)
+
+  ## Processing command line arguments
+  let conf = makeConfig()
+  waitFor loadBlocksFromBeaconChain(conf)
\ No newline at end of file