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-rw-r--r--src/net_processing.cpp37
-rw-r--r--src/net_processing.h4
2 files changed, 41 insertions, 0 deletions
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index e4d8d62a28..3a98b59b3f 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -168,6 +168,8 @@ struct CNodeState {
int nUnconnectingHeaders;
//! Whether we've started headers synchronization with this peer.
bool fSyncStarted;
+ //! When to potentially disconnect peer for stalling headers download
+ int64_t nHeadersSyncTimeout;
//! Since when we're stalling block download progress (in microseconds), or 0.
int64_t nStallingSince;
std::list<QueuedBlock> vBlocksInFlight;
@@ -207,6 +209,7 @@ struct CNodeState {
pindexBestHeaderSent = NULL;
nUnconnectingHeaders = 0;
fSyncStarted = false;
+ nHeadersSyncTimeout = 0;
nStallingSince = 0;
nDownloadingSince = 0;
nBlocksInFlight = 0;
@@ -2883,6 +2886,7 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
// Only actively request headers from a single peer, unless we're close to today.
if ((nSyncStarted == 0 && fFetch) || pindexBestHeader->GetBlockTime() > GetAdjustedTime() - 24 * 60 * 60) {
state.fSyncStarted = true;
+ state.nHeadersSyncTimeout = GetTimeMicros() + HEADERS_DOWNLOAD_TIMEOUT_BASE + HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER * (GetAdjustedTime() - pindexBestHeader->GetBlockTime())/(consensusParams.nPowTargetSpacing);
nSyncStarted++;
const CBlockIndex *pindexStart = pindexBestHeader;
/* If possible, start at the block preceding the currently
@@ -3206,6 +3210,39 @@ bool SendMessages(CNode* pto, CConnman& connman, const std::atomic<bool>& interr
return true;
}
}
+ // Check for headers sync timeouts
+ if (state.fSyncStarted && state.nHeadersSyncTimeout < std::numeric_limits<int64_t>::max()) {
+ // Detect whether this is a stalling initial-headers-sync peer
+ if (pindexBestHeader->GetBlockTime() <= GetAdjustedTime() - 24*60*60) {
+ if (nNow > state.nHeadersSyncTimeout && nSyncStarted == 1 && (nPreferredDownload - state.fPreferredDownload >= 1)) {
+ // Disconnect a (non-whitelisted) peer if it is our only sync peer,
+ // and we have others we could be using instead.
+ // Note: If all our peers are inbound, then we won't
+ // disconnect our sync peer for stalling; we have bigger
+ // problems if we can't get any outbound peers.
+ if (!pto->fWhitelisted) {
+ LogPrintf("Timeout downloading headers from peer=%d, disconnecting\n", pto->GetId());
+ pto->fDisconnect = true;
+ return true;
+ } else {
+ LogPrintf("Timeout downloading headers from whitelisted peer=%d, not disconnecting\n", pto->GetId());
+ // Reset the headers sync state so that we have a
+ // chance to try downloading from a different peer.
+ // Note: this will also result in at least one more
+ // getheaders message to be sent to
+ // this peer (eventually).
+ state.fSyncStarted = false;
+ nSyncStarted--;
+ state.nHeadersSyncTimeout = 0;
+ }
+ }
+ } else {
+ // After we've caught up once, reset the timeout so we can't trigger
+ // disconnect later.
+ state.nHeadersSyncTimeout = std::numeric_limits<int64_t>::max();
+ }
+ }
+
//
// Message: getdata (blocks)
diff --git a/src/net_processing.h b/src/net_processing.h
index f460595bc1..db6d81e6b6 100644
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -17,6 +17,10 @@ static const int64_t ORPHAN_TX_EXPIRE_TIME = 20 * 60;
static const int64_t ORPHAN_TX_EXPIRE_INTERVAL = 5 * 60;
/** Default number of orphan+recently-replaced txn to keep around for block reconstruction */
static const unsigned int DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN = 100;
+/** Headers download timeout expressed in microseconds
+ * Timeout = base + per_header * (expected number of headers) */
+static constexpr int64_t HEADERS_DOWNLOAD_TIMEOUT_BASE = 15 * 60 * 1000000; // 15 minutes
+static constexpr int64_t HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER = 1000; // 1ms/header
/** Register with a network node to receive its signals */
void RegisterNodeSignals(CNodeSignals& nodeSignals);