fixes getReceipts proc signature in db_chain.nim

instead of using header as input param, now getReceipts using
receiptRoot hash, the intention is clearer and less data passed around
when we only using receiptRoot instead of whole block header.

nimbus/db/db_chain.nim

@@ -278,8 +278,8 @@ proc persistReceipts*(self: BaseChainDB, receipts: openArray[Receipt]): Hash256
     trie.put(rlp.encode(idx), rlp.encode(rec))
   trie.rootHash
 
-iterator getReceipts*(self: BaseChainDB; header: BlockHeader): Receipt =
-  var receiptDb = initHexaryTrie(self.db, header.receiptRoot)
+iterator getReceipts*(self: BaseChainDB; receiptRoot: Hash256): Receipt =
+  var receiptDb = initHexaryTrie(self.db, receiptRoot)
   var receiptIdx = 0
   while true:
     let receiptKey = rlp.encode(receiptIdx)

nimbus/rpc/p2p.nim

@@ -365,7 +365,7 @@ proc setupEthRpc*(node: EthereumNode, chain: BaseChainDB , server: RpcServer) =
       idx = 0
       prevGasUsed = GasInt(0)
 
-    for receipt in chain.getReceipts(header):
+    for receipt in chain.getReceipts(header.receiptRoot):
       let gasUsed = receipt.cumulativeGasUsed - prevGasUsed
       prevGasUsed = receipt.cumulativeGasUsed
       if idx == txDetails.index:

nimbus/tracer.nim

@@ -32,7 +32,7 @@ proc toJson(receipt: Receipt): JsonNode =
 
 proc dumpReceipts*(chainDB: BaseChainDB, header: BlockHeader): JsonNode =
   result = newJArray()
-  for receipt in chainDB.getReceipts(header):
+  for receipt in chainDB.getReceipts(header.receiptRoot):
     result.add receipt.toJson
 
 proc toJson*(receipts: seq[Receipt]): JsonNode =