Update dcrd JSON-RPC types module

This also includes help descriptions for the new powhash fields for the
verbose getblock and getblockhash response objects, and populates the powhash
fields in the RPC handlers.

Backport of 30218b1 and
4abcbee.

Author: jrick

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/decred/dcrd/dcrutil/v4 v4.0.1
 	github.com/decred/dcrd/gcs/v4 v4.0.0
 	github.com/decred/dcrd/hdkeychain/v3 v3.1.1
-	github.com/decred/dcrd/rpc/jsonrpc/types/v4 v4.0.0
+	github.com/decred/dcrd/rpc/jsonrpc/types/v4 v4.1.0
 	github.com/decred/dcrd/rpcclient/v8 v8.0.0
 	github.com/decred/dcrd/txscript/v4 v4.1.0
 	github.com/decred/dcrd/wire v1.6.0

go.sum

@@ -72,6 +72,8 @@ github.com/decred/dcrd/hdkeychain/v3 v3.1.1 h1:4WhyHNBy7ec6qBUC7Fq7JFVGSd7bpuR5H
 github.com/decred/dcrd/hdkeychain/v3 v3.1.1/go.mod h1:HaabrLc27lnny5/Ph9+6I3szp0op5MCb7smEwlzfD60=
 github.com/decred/dcrd/rpc/jsonrpc/types/v4 v4.0.0 h1:4YUKsWKrKlkhVMYGRB6G0XI6QfwUnwEH18eoEbM1/+M=
 github.com/decred/dcrd/rpc/jsonrpc/types/v4 v4.0.0/go.mod h1:dDHO7ivrPAhZjFD3LoOJN/kdq5gi0sxie6zCsWHAiUo=
+github.com/decred/dcrd/rpc/jsonrpc/types/v4 v4.1.0 h1:kQFK7FMTmMDX9amyhh8IR0vwwI8dH0KCBm42C64bWVs=
+github.com/decred/dcrd/rpc/jsonrpc/types/v4 v4.1.0/go.mod h1:dDHO7ivrPAhZjFD3LoOJN/kdq5gi0sxie6zCsWHAiUo=
 github.com/decred/dcrd/rpcclient/v8 v8.0.0 h1:O4B5d+8e2OjbeFW+c1XcZNQzyp++04ArWhXgYrsURus=
 github.com/decred/dcrd/rpcclient/v8 v8.0.0/go.mod h1:gx4+DI5apuOEeLwPBJFlMoj3GFWq1I7/X8XCQmMTi8Q=
 github.com/decred/dcrd/txscript/v4 v4.0.0/go.mod h1:OJtxNc5RqwQyfrRnG2gG8uMeNPo8IAJp+TD1UKXkqk8=

internal/rpc/jsonrpc/methods.go

@@ -1278,8 +1278,18 @@ func (s *Server) getBlockHeader(ctx context.Context, icmd interface{}) (interfac
 	})
 	medianTime := timestamps[len(timestamps)/2]
 
+	// Determine the PoW hash.  When the v1 PoW hash differs from the
+	// block hash, this is assumed to be v2 (DCP0011).  More advanced
+	// selection logic will be necessary if the PoW hash changes again in
+	// the future.
+	powHash := blockHeader.PowHashV1()
+	if powHash != *blockHash {
+		powHash = blockHeader.PowHashV2()
+	}
+
 	return &dcrdtypes.GetBlockHeaderVerboseResult{
 		Hash:          blockHash.String(),
+		PowHash:       powHash.String(),
 		Confirmations: confirmations,
 		Version:       blockHeader.Version,
 		MerkleRoot:    blockHeader.MerkleRoot.String(),
@@ -1394,9 +1404,19 @@ func (s *Server) getBlock(ctx context.Context, icmd interface{}) (interface{}, e
 	})
 	medianTime := timestamps[len(timestamps)/2]
 
+	// Determine the PoW hash.  When the v1 PoW hash differs from the
+	// block hash, this is assumed to be v2 (DCP0011).  More advanced
+	// selection logic will be necessary if the PoW hash changes again in
+	// the future.
+	powHash := blockHeader.PowHashV1()
+	if powHash != *blockHash {
+		powHash = blockHeader.PowHashV2()
+	}
+
 	sbitsFloat := float64(blockHeader.SBits) / dcrutil.AtomsPerCoin
 	blockReply := dcrdtypes.GetBlockVerboseResult{
 		Hash:          cmd.Hash,
+		PoWHash:       powHash.String(),
 		Version:       blockHeader.Version,
 		MerkleRoot:    blockHeader.MerkleRoot.String(),
 		StakeRoot:     blockHeader.StakeRoot.String(),

internal/rpc/jsonrpc/rpcserverhelp.go

@@ -196,6 +196,7 @@ 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",
@@ -231,6 +232,7 @@ 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",