internal/web3ext, les: update clique JS and make it work with the light client (ethereum#20318)

Also fix the input formatter on clique_getSnapshot and clique_getSigners
so that integers as well as hex number strings are accepted.

Author: fjl

internal/web3ext/web3ext.go

@@ -74,7 +74,7 @@ web3._extend({
 			name: 'getSnapshot',
 			call: 'clique_getSnapshot',
 			params: 1,
-			inputFormatter: [null]
+			inputFormatter: [web3._extend.utils.fromDecimal]
 		}),
 		new web3._extend.Method({
 			name: 'getSnapshotAtHash',
@@ -85,7 +85,7 @@ web3._extend({
 			name: 'getSigners',
 			call: 'clique_getSigners',
 			params: 1,
-			inputFormatter: [null]
+			inputFormatter: [web3._extend.utils.fromDecimal]
 		}),
 		new web3._extend.Method({
 			name: 'getSignersAtHash',
@@ -102,6 +102,11 @@ web3._extend({
 			call: 'clique_discard',
 			params: 1
 		}),
+		new web3._extend.Method({
+			name: 'status',
+			call: 'clique_status',
+			params: 0
+		}),
 	],
 	properties: [
 		new web3._extend.Property({

les/client.go

@@ -176,7 +176,9 @@ func (s *LightDummyAPI) Mining() bool {
 // APIs returns the collection of RPC services the ethereum package offers.
 // NOTE, some of these services probably need to be moved to somewhere else.
 func (s *LightEthereum) APIs() []rpc.API {
-	return append(ethapi.GetAPIs(s.ApiBackend), []rpc.API{
+	apis := ethapi.GetAPIs(s.ApiBackend)
+	apis = append(apis, s.engine.APIs(s.BlockChain().HeaderChain())...)
+	return append(apis, []rpc.API{
 		{
 			Namespace: "eth",
 			Version:   "1.0",

light/lightchain.go

@@ -143,6 +143,11 @@ func (lc *LightChain) Odr() OdrBackend {
 	return lc.odr
 }
 
+// HeaderChain returns the underlying header chain.
+func (lc *LightChain) HeaderChain() *core.HeaderChain {
+	return lc.hc
+}
+
 // loadLastState loads the last known chain state from the database. This method
 // assumes that the chain manager mutex is held.
 func (lc *LightChain) loadLastState() error {