From 5c1833d49f9781306948c0f9b022a10221877f9c Mon Sep 17 00:00:00 2001
From: g11tech <76567250+g11tech@users.noreply.github.com>
Date: Thu, 12 May 2022 17:09:31 +0530
Subject: [PATCH] Add merge transition/finalization banners (#3963)

* Add merge transition/finalization banners

* fix signatures
---
 .../utils/pandaMergeTransitionBanner.ts       | 36 +++++++++++++++++++
 .../lodestar/src/chain/blocks/verifyBlock.ts  | 21 ++++++++++-
 2 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 packages/lodestar/src/chain/blocks/utils/pandaMergeTransitionBanner.ts

diff --git a/packages/lodestar/src/chain/blocks/utils/pandaMergeTransitionBanner.ts b/packages/lodestar/src/chain/blocks/utils/pandaMergeTransitionBanner.ts
new file mode 100644
index 000000000000..d0a0134013cc
--- /dev/null
+++ b/packages/lodestar/src/chain/blocks/utils/pandaMergeTransitionBanner.ts
@@ -0,0 +1,36 @@
+/* eslint-disable no-useless-escape */
+export const POS_PANDA_MERGE_TRANSITION_BANNER = `
+                                              _,..._,m,      |,                       _,..._,m,      |,
+                                            ,/'      '"";     | |,                   /'      '"";     | |,
+                                           /             ".                                      ".
+                                         ,'mmmMMMMmm.      \  -|-_"               'mmmMMMMmm.      \  -|-_"
+                                      _/-"^^^^^"""%#%mm,   ;  | _ o          /-"^^^^^"""%#%mm,   ;  | _ o
+                                ,m,_,'               "###)  ;,         m,_,'               "###)  ;,
+                               (###%                 \#/  ;##mm.      (###%                 \#/  ;##mm.
+                                ^#/__        ___      ;  (######)      #/__        ___      ;  (######)
+                               ; //.\\      //.\\     ;   \####/       //.\\      //.\\     ;   \####/
+                             _; (#\"//      \\"/#)    ;  ,/        _; (#\"//      \\"/#)    ;  ,/
+                            @##\ \##/   =    "="     ,;mm/        @##\ \##/   =    "="     ,;mm/
+                              \##>.____,...,____,<####@             \##>.____,...,____,<####@
+                                                     ""'                               ""'    
+ _______                                 ______                    ______          ______    __                __                 
+/       \                               /      \                  /      \        /      \  /  |              /  |                
+$$$$$$$  | ______    ______    ______  /$$$$$$  |        ______  /$$$$$$  |      /$$$$$$  |_$$ |_     ______  $$ |   __   ______  
+$$ |__$$ |/      \  /      \  /      \ $$ |_ $$/        /      \ $$ |_ $$/       $$ \__$$// $$   |   /      \ $$ |  /  | /      \ 
+$$    $$//$$$$$$  |/$$$$$$  |/$$$$$$  |$$   |          /$$$$$$  |$$   |          $$      \$$$$$$/    $$$$$$  |$$ |_/$$/ /$$$$$$  |
+$$$$$$$/ $$ |  $$/ $$ |  $$ |$$ |  $$ |$$$$/           $$ |  $$ |$$$$/            $$$$$$  | $$ | __  /    $$ |$$   $$<  $$    $$ |
+$$ |     $$ |      $$ \__$$ |$$ \__$$ |$$ |            $$ \__$$ |$$ |            /  \__$$ | $$ |/  |/$$$$$$$ |$$$$$$  \ $$$$$$$$/ 
+$$ |     $$ |      $$    $$/ $$    $$/ $$ |            $$    $$/ $$ |            $$    $$/  $$  $$/ $$    $$ |$$ | $$  |$$       |
+$$/      $$/        $$$$$$/   $$$$$$/  $$/              $$$$$$/  $$/              $$$$$$/    $$$$/   $$$$$$$/ $$/   $$/  $$$$$$$/ 
+                                                                                                                                  
+                                                                                                                                  
+                                                                                                                                  
+  ______               __      __                        __                      __                                               
+ /      \             /  |    /  |                      /  |                    /  |                                              
+/$$$$$$  |  _______  _$$ |_   $$/  __     __  ______   _$$ |_     ______    ____$$ |                                              
+$$ |__$$ | /       |/ $$   |  /  |/  \   /  |/      \ / $$   |   /      \  /    $$ |                                              
+$$    $$ |/$$$$$$$/ $$$$$$/   $$ |$$  \ /$$/ $$$$$$  |$$$$$$/   /$$$$$$  |/$$$$$$$ |                                              
+$$$$$$$$ |$$ |        $$ | __ $$ | $$  /$$/  /    $$ |  $$ | __ $$    $$ |$$ |  $$ |                                              
+$$ |  $$ |$$ \_____   $$ |/  |$$ |  $$ $$/  /$$$$$$$ |  $$ |/  |$$$$$$$$/ $$ \__$$ |                                              
+$$ |  $$ |$$       |  $$  $$/ $$ |   $$$/   $$    $$ |  $$  $$/ $$       |$$    $$ |                                              
+$$/   $$/  $$$$$$$/    $$$$/  $$/     $/     $$$$$$$/    $$$$/   $$$$$$$/  $$$$$$$/    `;
diff --git a/packages/lodestar/src/chain/blocks/verifyBlock.ts b/packages/lodestar/src/chain/blocks/verifyBlock.ts
index 302bde6c98c0..e9cfd08cda40 100644
--- a/packages/lodestar/src/chain/blocks/verifyBlock.ts
+++ b/packages/lodestar/src/chain/blocks/verifyBlock.ts
@@ -19,6 +19,7 @@ import {FullyVerifiedBlock, PartiallyVerifiedBlock} from "./types";
 import {ExecutePayloadStatus} from "../../executionEngine/interface";
 import {byteArrayEquals} from "../../util/bytes";
 import {IEth1ForBlockProduction} from "../../eth1";
+import {POS_PANDA_MERGE_TRANSITION_BANNER} from "./utils/pandaMergeTransitionBanner";
 
 export type VerifyBlockModules = {
   bls: IBlsVerifier;
@@ -151,7 +152,6 @@ export async function verifyBlockStateTransition(
     chain.metrics
   );
 
-  // TODO: Review mergeBlock conditions
   /** Not null if execution is enabled */
   const executionPayloadEnabled =
     bellatrix.isBellatrixStateType(postState) &&
@@ -317,5 +317,24 @@ export async function verifyBlockStateTransition(
     });
   }
 
+  // All checks have passed, if this is a merge transition block we can log
+  if (isMergeTransitionBlock) {
+    logOnPowBlock(chain, block as bellatrix.SignedBeaconBlock);
+  }
+
   return {postState, executionStatus};
 }
+
+function logOnPowBlock(chain: VerifyBlockModules, block: bellatrix.SignedBeaconBlock): void {
+  const mergeBlock = block.message;
+  const mergeBlockHash = toHexString(chain.config.getForkTypes(mergeBlock.slot).BeaconBlock.hashTreeRoot(mergeBlock));
+  const mergeExecutionHash = toHexString(mergeBlock.body.executionPayload.blockHash);
+  const mergePowHash = toHexString(mergeBlock.body.executionPayload.parentHash);
+  chain.logger.info(POS_PANDA_MERGE_TRANSITION_BANNER);
+  chain.logger.info("Execution transitioning from PoW to PoS!!!");
+  chain.logger.info("Importing block referencing terminal PoW block", {
+    blockHash: mergeBlockHash,
+    executionHash: mergeExecutionHash,
+    powHash: mergePowHash,
+  });
+}