From 060f951f2c594162c9ee8c33785f56e18c61352d Mon Sep 17 00:00:00 2001
From: Jonathan Chappelow <chappjc@protonmail.com>
Date: Tue, 18 Jul 2023 17:31:53 -0500
Subject: [PATCH] rpc: Add PoWHash to getblock/getblockheader (verbose)
 results.

---
 internal/rpcserver/rpcserver.go              | 24 +++++++++++++++++++-
 internal/rpcserver/rpcserverhandlers_test.go |  6 +++++
 internal/rpcserver/rpcserverhelp.go          |  4 +++-
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/internal/rpcserver/rpcserver.go b/internal/rpcserver/rpcserver.go
index 8de7bb7167..f44d4ff2ba 100644
--- a/internal/rpcserver/rpcserver.go
+++ b/internal/rpcserver/rpcserver.go
@@ -61,7 +61,7 @@ import (
 // API version constants
 const (
 	jsonrpcSemverMajor = 8
-	jsonrpcSemverMinor = 0
+	jsonrpcSemverMinor = 1
 	jsonrpcSemverPatch = 0
 )
 
@@ -1969,8 +1969,19 @@ func handleGetBlock(_ context.Context, s *Server, cmd interface{}) (interface{},
 		return nil, rpcInternalError(err.Error(), "Unable to retrieve median block time")
 	}
 
+	isBlake3PowActive, err := s.isBlake3PowAgendaActive(&blockHeader.PrevBlock)
+	if err != nil {
+		return nil, err
+	}
+	powHashFn := blockHeader.PowHashV1
+	if isBlake3PowActive {
+		powHashFn = blockHeader.PowHashV2
+	}
+	powHash := powHashFn()
+
 	blockReply := types.GetBlockVerboseResult{
 		Hash:          c.Hash,
+		PoWHash:       powHash.String(),
 		Version:       blockHeader.Version,
 		MerkleRoot:    blockHeader.MerkleRoot.String(),
 		StakeRoot:     blockHeader.StakeRoot.String(),
@@ -2249,8 +2260,19 @@ func handleGetBlockHeader(_ context.Context, s *Server, cmd interface{}) (interf
 		return nil, rpcInternalError(err.Error(), "Unable to retrieve median block time")
 	}
 
+	isBlake3PowActive, err := s.isBlake3PowAgendaActive(&blockHeader.PrevBlock)
+	if err != nil {
+		return nil, err
+	}
+	powHashFn := blockHeader.PowHashV1
+	if isBlake3PowActive {
+		powHashFn = blockHeader.PowHashV2
+	}
+	powHash := powHashFn()
+
 	blockHeaderReply := types.GetBlockHeaderVerboseResult{
 		Hash:          c.Hash,
+		PowHash:       powHash.String(),
 		Confirmations: confirmations,
 		Version:       blockHeader.Version,
 		MerkleRoot:    blockHeader.MerkleRoot.String(),
diff --git a/internal/rpcserver/rpcserverhandlers_test.go b/internal/rpcserver/rpcserverhandlers_test.go
index 7e7ac83068..1fc559c549 100644
--- a/internal/rpcserver/rpcserverhandlers_test.go
+++ b/internal/rpcserver/rpcserverhandlers_test.go
@@ -3763,6 +3763,8 @@ func TestHandleGetBlock(t *testing.T) {
 	blk := dcrutil.NewBlock(&block432100)
 	blkHash := blk.Hash()
 	blkHashString := blkHash.String()
+	powHash := blkHeader.PowHashV1() // pre-DCP0011 activation
+	powHashString := powHash.String()
 	blkBytes, err := blk.Bytes()
 	if err != nil {
 		t.Fatalf("error serializing block: %+v", err)
@@ -3827,6 +3829,7 @@ func TestHandleGetBlock(t *testing.T) {
 		}(),
 		result: types.GetBlockVerboseResult{
 			Hash:          blkHashString,
+			PoWHash:       powHashString,
 			Version:       blkHeader.Version,
 			MerkleRoot:    blkHeader.MerkleRoot.String(),
 			StakeRoot:     blkHeader.StakeRoot.String(),
@@ -3882,6 +3885,7 @@ func TestHandleGetBlock(t *testing.T) {
 		}(),
 		result: types.GetBlockVerboseResult{
 			Hash:          blkHashString,
+			PoWHash:       powHashString,
 			Version:       blkHeader.Version,
 			MerkleRoot:    blkHeader.MerkleRoot.String(),
 			StakeRoot:     blkHeader.StakeRoot.String(),
@@ -4032,6 +4036,7 @@ func TestHandleGetBlockHeader(t *testing.T) {
 		t.Fatalf("error serializing block header: %+v", err)
 	}
 	blkHeaderHexString := hex.EncodeToString(blkHeaderBytes)
+	powHashString := blkHeader.PowHashV1().String() // pre-DCP0011 block
 	blk := dcrutil.NewBlock(&block432100)
 	blkHash := blk.Hash()
 	blkHashString := blkHash.String()
@@ -4065,6 +4070,7 @@ func TestHandleGetBlockHeader(t *testing.T) {
 		}(),
 		result: types.GetBlockHeaderVerboseResult{
 			Hash:          blkHashString,
+			PowHash:       powHashString,
 			Confirmations: confirmations,
 			Version:       blkHeader.Version,
 			MerkleRoot:    blkHeader.MerkleRoot.String(),
diff --git a/internal/rpcserver/rpcserverhelp.go b/internal/rpcserver/rpcserverhelp.go
index 158b68eee0..807219f689 100644
--- a/internal/rpcserver/rpcserverhelp.go
+++ b/internal/rpcserver/rpcserverhelp.go
@@ -1,5 +1,5 @@
 // Copyright (c) 2015 The btcsuite developers
-// Copyright (c) 2015-2022 The Decred developers
+// Copyright (c) 2015-2023 The Decred developers
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
@@ -276,6 +276,7 @@ var helpDescsEnUS = map[string]string{
 
 	// GetBlockVerboseResult help.
 	"getblockverboseresult-hash":              "The hash of the block (same as provided)",
+	"getblockverboseresult-powhash":           "The Proof-of-Work hash of the block (same as hash prior to DCP0011 activation)",
 	"getblockverboseresult-confirmations":     "The number of confirmations",
 	"getblockverboseresult-size":              "The size of the block",
 	"getblockverboseresult-height":            "The height of the block in the block chain",
@@ -323,6 +324,7 @@ var helpDescsEnUS = map[string]string{
 
 	// GetBlockHeaderVerboseResult help.
 	"getblockheaderverboseresult-hash":              "The hash of the block (same as provided)",
+	"getblockheaderverboseresult-powhash":           "The Proof-of-Work hash of the block (same as hash prior to DCP0011 activation)",
 	"getblockheaderverboseresult-confirmations":     "The number of confirmations",
 	"getblockheaderverboseresult-height":            "The height of the block in the block chain",
 	"getblockheaderverboseresult-version":           "The block version",