consensus/clique, internal/web3ext: support hash based API queries (#14321)

* consensus/clique, internal/web3ext: support hash based API queries

* consensus/clique: make RPC return types public

1 files changed, 23 insertions, 1 deletions

diff --git a/consensus/clique/api.go b/consensus/clique/api.go
index 0cf25abff..b875eef01 100644
--- a/consensus/clique/api.go
+++ b/consensus/clique/api.go
@@ -31,7 +31,7 @@ type API struct {
 }
 
 // GetSnapshot retrieves the state snapshot at a given block.
-func (api *API) GetSnapshot(number *rpc.BlockNumber) (interface{}, error) {
+func (api *API) GetSnapshot(number *rpc.BlockNumber) (*Snapshot, error) {
 	// Retrieve the requested block number (or current if none requested)
 	var header *types.Header
 	if number == nil || *number == rpc.LatestBlockNumber {
@@ -46,6 +46,15 @@ func (api *API) GetSnapshot(number *rpc.BlockNumber) (interface{}, error) {
 	return api.clique.snapshot(api.chain, header.Number.Uint64(), header.Hash(), nil)
 }
 
+// GetSnapshotAtHash retrieves the state snapshot at a given block.
+func (api *API) GetSnapshotAtHash(hash common.Hash) (*Snapshot, error) {
+	header := api.chain.GetHeaderByHash(hash)
+	if header == nil {
+		return nil, errUnknownBlock
+	}
+	return api.clique.snapshot(api.chain, header.Number.Uint64(), header.Hash(), nil)
+}
+
 // GetSigners retrieves the list of authorized signers at the specified block.
 func (api *API) GetSigners(number *rpc.BlockNumber) ([]common.Address, error) {
 	// Retrieve the requested block number (or current if none requested)
@@ -66,6 +75,19 @@ func (api *API) GetSigners(number *rpc.BlockNumber) ([]common.Address, error) {
 	return snap.signers(), nil
 }
 
+// GetSignersAtHash retrieves the state snapshot at a given block.
+func (api *API) GetSignersAtHash(hash common.Hash) ([]common.Address, error) {
+	header := api.chain.GetHeaderByHash(hash)
+	if header == nil {
+		return nil, errUnknownBlock
+	}
+	snap, err := api.clique.snapshot(api.chain, header.Number.Uint64(), header.Hash(), nil)
+	if err != nil {
+		return nil, err
+	}
+	return snap.signers(), nil
+}
+
 // Proposals returns the current proposals the node tries to uphold and vote on.
 func (api *API) Proposals() map[common.Address]bool {
 	api.clique.lock.RLock()