From 5cf1d354704cd2cbc5c64c96d4aaabeeec7dd161 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Thu, 22 Feb 2018 12:48:14 +0200
Subject: eth, les, light: filter on logs only, derive receipts on demand

---
 light/odr_util.go | 45 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 39 insertions(+), 6 deletions(-)

(limited to 'light/odr_util.go')

diff --git a/light/odr_util.go b/light/odr_util.go
index 8f92d6442..97ba440ac 100644
--- a/light/odr_util.go
+++ b/light/odr_util.go
@@ -126,15 +126,48 @@ func GetBlock(ctx context.Context, odr OdrBackend, hash common.Hash, number uint
 // GetBlockReceipts retrieves the receipts generated by the transactions included
 // in a block given by its hash.
 func GetBlockReceipts(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (types.Receipts, error) {
+	// Retrieve the potentially incomplete receipts from disk or network
 	receipts := core.GetBlockReceipts(odr.Database(), hash, number)
-	if receipts != nil {
-		return receipts, nil
+	if receipts == nil {
+		r := &ReceiptsRequest{Hash: hash, Number: number}
+		if err := odr.Retrieve(ctx, r); err != nil {
+			return nil, err
+		}
+		receipts = r.Receipts
 	}
-	r := &ReceiptsRequest{Hash: hash, Number: number}
-	if err := odr.Retrieve(ctx, r); err != nil {
-		return nil, err
+	// If the receipts are incomplete, fill the derived fields
+	if len(receipts) > 0 && receipts[0].TxHash == (common.Hash{}) {
+		block, err := GetBlock(ctx, odr, hash, number)
+		if err != nil {
+			return nil, err
+		}
+		genesis := core.GetCanonicalHash(odr.Database(), 0)
+		config, _ := core.GetChainConfig(odr.Database(), genesis)
+
+		core.SetReceiptsData(config, block, receipts)
+		core.WriteBlockReceipts(odr.Database(), hash, number, receipts)
+	}
+	return receipts, nil
+}
+
+// GetBlockLogs retrieves the logs generated by the transactions included in a
+// block given by its hash.
+func GetBlockLogs(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) ([][]*types.Log, error) {
+	// Retrieve the potentially incomplete receipts from disk or network
+	receipts := core.GetBlockReceipts(odr.Database(), hash, number)
+	if receipts == nil {
+		r := &ReceiptsRequest{Hash: hash, Number: number}
+		if err := odr.Retrieve(ctx, r); err != nil {
+			return nil, err
+		}
+		receipts = r.Receipts
+	}
+	// Return the logs without deriving any computed fields on the receipts
+	logs := make([][]*types.Log, len(receipts))
+	for i, receipt := range receipts {
+		logs[i] = receipt.Logs
 	}
-	return r.Receipts, nil
+	return logs, nil
 }
 
 // GetBloomBits retrieves a batch of compressed bloomBits vectors belonging to the given bit index and section indexes
-- 
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