Merge bitcoin#9908: Define 7200 second timestamp window constant

e57a1fd Define 7200 second timestamp window constant (Russell Yanofsky)

Tree-SHA512: 449d20e4fd23905cd96be36f717c55a0a2360aba1002aaf55a3699cce4a41f6e94acc2fbe511a93c5cbe8f8e68386995a76cad67620ebb66ba9283e6080ab567

qa/rpc-tests/import-rescan.py

@@ -54,7 +54,7 @@ def do_import(self, timestamp):
                 "scriptPubKey": {
                     "address": self.address["address"]
                 },
-                "timestamp": timestamp + RESCAN_WINDOW + (1 if self.rescan == Rescan.late_timestamp else 0),
+                "timestamp": timestamp + TIMESTAMP_WINDOW + (1 if self.rescan == Rescan.late_timestamp else 0),
                 "pubkeys": [self.address["pubkey"]] if self.data == Data.pub else [],
                 "keys": [self.key] if self.data == Data.priv else [],
                 "label": self.label,
@@ -100,7 +100,7 @@ def check(self, txid=None, amount=None, confirmations=None):
 IMPORT_NODES = [ImportNode(*fields) for fields in itertools.product((False, True), repeat=2)]
 
 # Rescans start at the earliest block up to 2 hours before the key timestamp.
-RESCAN_WINDOW = 2 * 60 * 60
+TIMESTAMP_WINDOW = 2 * 60 * 60
 
 
 class ImportRescanTest(BitcoinTestFramework):
@@ -134,7 +134,7 @@ def run_test(self):
         self.nodes[0].generate(1)
         assert_equal(self.nodes[0].getrawmempool(), [])
         timestamp = self.nodes[0].getblockheader(self.nodes[0].getbestblockhash())["time"]
-        set_node_times(self.nodes, timestamp + RESCAN_WINDOW + 1)
+        set_node_times(self.nodes, timestamp + TIMESTAMP_WINDOW + 1)
         self.nodes[0].generate(1)
         sync_blocks(self.nodes)
 

qa/rpc-tests/pruning.py

@@ -21,7 +21,7 @@
 # Rescans start at the earliest block up to 2 hours before a key timestamp, so
 # the manual prune RPC avoids pruning blocks in the same window to be
 # compatible with pruning based on key creation time.
-RESCAN_WINDOW = 2 * 60 * 60
+TIMESTAMP_WINDOW = 2 * 60 * 60
 
 
 def calc_usage(blockdir):
@@ -244,7 +244,7 @@ def manual_test(self, node_number, use_timestamp):
 
         def height(index):
             if use_timestamp:
-                return node.getblockheader(node.getblockhash(index))["time"] + RESCAN_WINDOW
+                return node.getblockheader(node.getblockhash(index))["time"] + TIMESTAMP_WINDOW
             else:
                 return index
 

src/chain.h

@@ -14,6 +14,20 @@
 
 #include <vector>
 
+/**
+ * Maximum amount of time that a block timestamp is allowed to exceed the
+ * current network-adjusted time before the block will be accepted.
+ */
+static const int64_t MAX_FUTURE_BLOCK_TIME = 2 * 60 * 60;
+
+/**
+ * Timestamp window used as a grace period by code that compares external
+ * timestamps (such as timestamps passed to RPCs, or wallet key creation times)
+ * to block timestamps. This should be set at least as high as
+ * MAX_FUTURE_BLOCK_TIME.
+ */
+static const int64_t TIMESTAMP_WINDOW = MAX_FUTURE_BLOCK_TIME;
+
 class CBlockFileInfo
 {
 public:

src/rpc/blockchain.cpp

@@ -1004,7 +1004,7 @@ UniValue pruneblockchain(const JSONRPCRequest& request)
     // too low to be a block time (corresponds to timestamp from Sep 2001).
     if (heightParam > 1000000000) {
         // Add a 2 hour buffer to include blocks which might have had old timestamps
-        CBlockIndex* pindex = chainActive.FindEarliestAtLeast(heightParam - 7200);
+        CBlockIndex* pindex = chainActive.FindEarliestAtLeast(heightParam - TIMESTAMP_WINDOW);
         if (!pindex) {
             throw JSONRPCError(RPC_INTERNAL_ERROR, "Could not find block with at least the specified timestamp.");
         }

src/validation.cpp

@@ -3322,7 +3322,7 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta
         return state.Invalid(false, REJECT_INVALID, "time-too-old", strprintf("block's timestamp is too early %d %d", block.GetBlockTime(), pindexPrev->GetMedianTimePast()));
 
     // Check timestamp
-    if (block.GetBlockTime() > nAdjustedTime + 2 * 60 * 60)
+    if (block.GetBlockTime() > nAdjustedTime + MAX_FUTURE_BLOCK_TIME)
         return state.Invalid(false, REJECT_INVALID, "time-too-new", strprintf("block timestamp too far in the future %d %d", block.GetBlockTime(), nAdjustedTime + 2 * 60 * 60));
 
     // check for version 2, 3 and 4 upgrades

src/wallet/rpcdump.cpp

@@ -514,7 +514,7 @@ UniValue importwallet(const JSONRPCRequest& request)
     pwallet->ShowProgress("", 100); // hide progress dialog in GUI
 
     CBlockIndex *pindex = chainActive.Tip();
-    while (pindex && pindex->pprev && pindex->GetBlockTime() > nTimeBegin - 7200)
+    while (pindex && pindex->pprev && pindex->GetBlockTime() > nTimeBegin - TIMESTAMP_WINDOW)
         pindex = pindex->pprev;
 
     pwallet->UpdateTimeFirstKey(nTimeBegin);
@@ -1313,7 +1313,7 @@ UniValue importmulti(const JSONRPCRequest& mainRequest)
     }
 
     if (fRescan && fRunScan && requests.size()) {
-        CBlockIndex* pindex = nLowestTimestamp > minimumTimestamp ? chainActive.FindEarliestAtLeast(std::max<int64_t>(nLowestTimestamp - 7200, 0)) : chainActive.Genesis();
+        CBlockIndex* pindex = nLowestTimestamp > minimumTimestamp ? chainActive.FindEarliestAtLeast(std::max<int64_t>(nLowestTimestamp - TIMESTAMP_WINDOW, 0)) : chainActive.Genesis();
         CBlockIndex* scannedRange = nullptr;
         if (pindex) {
             scannedRange = pwallet->ScanForWalletTransactions(pindex, true);
@@ -1330,7 +1330,7 @@ UniValue importmulti(const JSONRPCRequest& mainRequest)
                 // range, or if the import result already has an error set, let
                 // the result stand unmodified. Otherwise replace the result
                 // with an error message.
-                if (GetImportTimestamp(request, now) - 7200 >= scannedRange->GetBlockTimeMax() || results.at(i).exists("error")) {
+                if (GetImportTimestamp(request, now) - TIMESTAMP_WINDOW >= scannedRange->GetBlockTimeMax() || results.at(i).exists("error")) {
                     response.push_back(results.at(i));
                 } else {
                     UniValue result = UniValue(UniValue::VOBJ);

src/wallet/test/wallet_tests.cpp

@@ -415,7 +415,7 @@ BOOST_FIXTURE_TEST_CASE(rescan, TestChain100Setup)
         CKey futureKey;
         futureKey.MakeNewKey(true);
         key.pushKV("scriptPubKey", HexStr(GetScriptForRawPubKey(futureKey.GetPubKey())));
-        key.pushKV("timestamp", newTip->GetBlockTimeMax() + 7200);
+        key.pushKV("timestamp", newTip->GetBlockTimeMax() + TIMESTAMP_WINDOW);
         key.pushKV("internal", UniValue(true));
         keys.push_back(key);
         JSONRPCRequest request;

src/wallet/wallet.cpp

@@ -1904,7 +1904,7 @@ CBlockIndex* CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool f
 
         // no need to read and scan block, if block was created before
         // our wallet birthday (as adjusted for block time variability)
-        while (pindex && nTimeFirstKey && (pindex->GetBlockTime() < (nTimeFirstKey - 7200)))
+        while (pindex && nTimeFirstKey && (pindex->GetBlockTime() < (nTimeFirstKey - TIMESTAMP_WINDOW)))
             pindex = chainActive.Next(pindex);
 
         ShowProgress(_("Rescanning..."), 0); // show rescan progress in GUI as dialog or on splashscreen, if -rescan on startup
@@ -4744,7 +4744,7 @@ void CWallet::GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) c
 
     // Extract block timestamps for those keys
     for (std::map<CKeyID, CBlockIndex*>::const_iterator it = mapKeyFirstBlock.begin(); it != mapKeyFirstBlock.end(); it++)
-        mapKeyBirth[it->first] = it->second->GetBlockTime() - 7200; // block times can be 2h off
+        mapKeyBirth[it->first] = it->second->GetBlockTime() - TIMESTAMP_WINDOW; // block times can be 2h off
 }
 
 bool CWallet::AddDestData(const CTxDestination &dest, const std::string &key, const std::string &value)