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Make CBlockIndex*es in net_processing const
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@TheBlueMatt
TheBlueMatt committed Jan 4, 2017
1 parent 7dac1e5 commit 8017547
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Showing 3 changed files with 29 additions and 27 deletions.
48 changes: 24 additions & 24 deletions src/net_processing.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -101,7 +101,7 @@ namespace {
/** Blocks that are in flight, and that are in the queue to be downloaded. Protected by cs_main. */
struct QueuedBlock {
uint256 hash;
CBlockIndex* pindex; //!< Optional.
const CBlockIndex* pindex; //!< Optional.
bool fValidatedHeaders; //!< Whether this block has validated headers at the time of request.
std::unique_ptr<PartiallyDownloadedBlock> partialBlock; //!< Optional, used for CMPCTBLOCK downloads
};
Expand Down Expand Up @@ -156,13 +156,13 @@ struct CNodeState {
//! List of asynchronously-determined block rejections to notify this peer about.
std::vector<CBlockReject> rejects;
//! The best known block we know this peer has announced.
CBlockIndex *pindexBestKnownBlock;
const CBlockIndex *pindexBestKnownBlock;
//! The hash of the last unknown block this peer has announced.
uint256 hashLastUnknownBlock;
//! The last full block we both have.
CBlockIndex *pindexLastCommonBlock;
const CBlockIndex *pindexLastCommonBlock;
//! The best header we have sent our peer.
CBlockIndex *pindexBestHeaderSent;
const CBlockIndex *pindexBestHeaderSent;
//! Length of current-streak of unconnecting headers announcements
int nUnconnectingHeaders;
//! Whether we've started headers synchronization with this peer.
Expand Down Expand Up @@ -331,7 +331,7 @@ bool MarkBlockAsReceived(const uint256& hash) {
// Requires cs_main.
// returns false, still setting pit, if the block was already in flight from the same peer
// pit will only be valid as long as the same cs_main lock is being held
bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const Consensus::Params& consensusParams, CBlockIndex *pindex = NULL, list<QueuedBlock>::iterator **pit = NULL) {
bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const Consensus::Params& consensusParams, const CBlockIndex *pindex = NULL, list<QueuedBlock>::iterator **pit = NULL) {
CNodeState *state = State(nodeid);
assert(state != NULL);

Expand Down Expand Up @@ -432,7 +432,7 @@ bool CanDirectFetch(const Consensus::Params &consensusParams)
}

// Requires cs_main
bool PeerHasHeader(CNodeState *state, CBlockIndex *pindex)
bool PeerHasHeader(CNodeState *state, const CBlockIndex *pindex)
{
if (state->pindexBestKnownBlock && pindex == state->pindexBestKnownBlock->GetAncestor(pindex->nHeight))
return true;
Expand All @@ -443,7 +443,7 @@ bool PeerHasHeader(CNodeState *state, CBlockIndex *pindex)

/** Find the last common ancestor two blocks have.
* Both pa and pb must be non-NULL. */
CBlockIndex* LastCommonAncestor(CBlockIndex* pa, CBlockIndex* pb) {
const CBlockIndex* LastCommonAncestor(const CBlockIndex* pa, const CBlockIndex* pb) {
if (pa->nHeight > pb->nHeight) {
pa = pa->GetAncestor(pb->nHeight);
} else if (pb->nHeight > pa->nHeight) {
Expand All @@ -462,7 +462,7 @@ CBlockIndex* LastCommonAncestor(CBlockIndex* pa, CBlockIndex* pb) {

/** Update pindexLastCommonBlock and add not-in-flight missing successors to vBlocks, until it has
* at most count entries. */
void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<CBlockIndex*>& vBlocks, NodeId& nodeStaller, const Consensus::Params& consensusParams) {
void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<const CBlockIndex*>& vBlocks, NodeId& nodeStaller, const Consensus::Params& consensusParams) {
if (count == 0)
return;

Expand Down Expand Up @@ -490,8 +490,8 @@ void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<CBl
if (state->pindexLastCommonBlock == state->pindexBestKnownBlock)
return;

std::vector<CBlockIndex*> vToFetch;
CBlockIndex *pindexWalk = state->pindexLastCommonBlock;
std::vector<const CBlockIndex*> vToFetch;
const CBlockIndex *pindexWalk = state->pindexLastCommonBlock;
// Never fetch further than the best block we know the peer has, or more than BLOCK_DOWNLOAD_WINDOW + 1 beyond the last
// linked block we have in common with this peer. The +1 is so we can detect stalling, namely if we would be able to
// download that next block if the window were 1 larger.
Expand All @@ -514,7 +514,7 @@ void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<CBl
// are not yet downloaded and not in flight to vBlocks. In the mean time, update
// pindexLastCommonBlock as long as all ancestors are already downloaded, or if it's
// already part of our chain (and therefore don't need it even if pruned).
BOOST_FOREACH(CBlockIndex* pindex, vToFetch) {
BOOST_FOREACH(const CBlockIndex* pindex, vToFetch) {
if (!pindex->IsValid(BLOCK_VALID_TREE)) {
// We consider the chain that this peer is on invalid.
return;
Expand Down Expand Up @@ -1049,7 +1049,7 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
}
}

uint32_t GetFetchFlags(CNode* pfrom, CBlockIndex* pprev, const Consensus::Params& chainparams) {
uint32_t GetFetchFlags(CNode* pfrom, const CBlockIndex* pprev, const Consensus::Params& chainparams) {
uint32_t nFetchFlags = 0;
if ((pfrom->GetLocalServices() & NODE_WITNESS) && State(pfrom->GetId())->fHaveWitness) {
nFetchFlags |= MSG_WITNESS_FLAG;
Expand Down Expand Up @@ -1456,7 +1456,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
LOCK(cs_main);

// Find the last block the caller has in the main chain
CBlockIndex* pindex = FindForkInGlobalIndex(chainActive, locator);
const CBlockIndex* pindex = FindForkInGlobalIndex(chainActive, locator);

// Send the rest of the chain
if (pindex)
Expand Down Expand Up @@ -1552,7 +1552,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
}

CNodeState *nodestate = State(pfrom->GetId());
CBlockIndex* pindex = NULL;
const CBlockIndex* pindex = NULL;
if (locator.IsNull())
{
// If locator is null, return the hashStop block
Expand Down Expand Up @@ -1775,7 +1775,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
}
}

CBlockIndex *pindex = NULL;
const CBlockIndex *pindex = NULL;
CValidationState state;
if (!ProcessNewBlockHeaders({cmpctblock.header}, state, chainparams, &pindex)) {
int nDoS;
Expand Down Expand Up @@ -2051,7 +2051,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
return true;
}

CBlockIndex *pindexLast = NULL;
const CBlockIndex *pindexLast = NULL;
{
LOCK(cs_main);
CNodeState *nodestate = State(pfrom->GetId());
Expand Down Expand Up @@ -2128,8 +2128,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
// If this set of headers is valid and ends in a block with at least as
// much work as our tip, download as much as possible.
if (fCanDirectFetch && pindexLast->IsValid(BLOCK_VALID_TREE) && chainActive.Tip()->nChainWork <= pindexLast->nChainWork) {
vector<CBlockIndex *> vToFetch;
CBlockIndex *pindexWalk = pindexLast;
vector<const CBlockIndex *> vToFetch;
const CBlockIndex *pindexWalk = pindexLast;
// Calculate all the blocks we'd need to switch to pindexLast, up to a limit.
while (pindexWalk && !chainActive.Contains(pindexWalk) && vToFetch.size() <= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
if (!(pindexWalk->nStatus & BLOCK_HAVE_DATA) &&
Expand All @@ -2151,7 +2151,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
} else {
vector<CInv> vGetData;
// Download as much as possible, from earliest to latest.
BOOST_REVERSE_FOREACH(CBlockIndex *pindex, vToFetch) {
BOOST_REVERSE_FOREACH(const CBlockIndex *pindex, vToFetch) {
if (nodestate->nBlocksInFlight >= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
// Can't download any more from this peer
break;
Expand Down Expand Up @@ -2740,7 +2740,7 @@ bool SendMessages(CNode* pto, CConnman& connman, std::atomic<bool>& interruptMsg
bool fRevertToInv = ((!state.fPreferHeaders &&
(!state.fPreferHeaderAndIDs || pto->vBlockHashesToAnnounce.size() > 1)) ||
pto->vBlockHashesToAnnounce.size() > MAX_BLOCKS_TO_ANNOUNCE);
CBlockIndex *pBestIndex = NULL; // last header queued for delivery
const CBlockIndex *pBestIndex = NULL; // last header queued for delivery
ProcessBlockAvailability(pto->id); // ensure pindexBestKnownBlock is up-to-date

if (!fRevertToInv) {
Expand All @@ -2751,7 +2751,7 @@ bool SendMessages(CNode* pto, CConnman& connman, std::atomic<bool>& interruptMsg
BOOST_FOREACH(const uint256 &hash, pto->vBlockHashesToAnnounce) {
BlockMap::iterator mi = mapBlockIndex.find(hash);
assert(mi != mapBlockIndex.end());
CBlockIndex *pindex = mi->second;
const CBlockIndex *pindex = mi->second;
if (chainActive[pindex->nHeight] != pindex) {
// Bail out if we reorged away from this block
fRevertToInv = true;
Expand Down Expand Up @@ -2828,7 +2828,7 @@ bool SendMessages(CNode* pto, CConnman& connman, std::atomic<bool>& interruptMsg
const uint256 &hashToAnnounce = pto->vBlockHashesToAnnounce.back();
BlockMap::iterator mi = mapBlockIndex.find(hashToAnnounce);
assert(mi != mapBlockIndex.end());
CBlockIndex *pindex = mi->second;
const CBlockIndex *pindex = mi->second;

// Warn if we're announcing a block that is not on the main chain.
// This should be very rare and could be optimized out.
Expand Down Expand Up @@ -3013,10 +3013,10 @@ bool SendMessages(CNode* pto, CConnman& connman, std::atomic<bool>& interruptMsg
//
vector<CInv> vGetData;
if (!pto->fClient && (fFetch || !IsInitialBlockDownload()) && state.nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
vector<CBlockIndex*> vToDownload;
vector<const CBlockIndex*> vToDownload;
NodeId staller = -1;
FindNextBlocksToDownload(pto->GetId(), MAX_BLOCKS_IN_TRANSIT_PER_PEER - state.nBlocksInFlight, vToDownload, staller, consensusParams);
BOOST_FOREACH(CBlockIndex *pindex, vToDownload) {
BOOST_FOREACH(const CBlockIndex *pindex, vToDownload) {
uint32_t nFetchFlags = GetFetchFlags(pto, pindex->pprev, consensusParams);
vGetData.push_back(CInv(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash()));
MarkBlockAsInFlight(pto->GetId(), pindex->GetBlockHash(), consensusParams, pindex);
Expand Down
6 changes: 4 additions & 2 deletions src/validation.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3030,12 +3030,14 @@ static bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state
}

// Exposed wrapper for AcceptBlockHeader
bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& headers, CValidationState& state, const CChainParams& chainparams, CBlockIndex** ppindex)
bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& headers, CValidationState& state, const CChainParams& chainparams, const CBlockIndex** ppindex)
{
{
LOCK(cs_main);
for (const CBlockHeader& header : headers) {
if (!AcceptBlockHeader(header, state, chainparams, ppindex)) {
// cast away the ppindex-returns-const CBlockIndex - we're just assigning it to a CBlockIndex*
// that we own and is updated non-const anyway
if (!AcceptBlockHeader(header, state, chainparams, const_cast<CBlockIndex**>(ppindex))) {
return false;
}
}
Expand Down
2 changes: 1 addition & 1 deletion src/validation.h
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Original file line number Diff line number Diff line change
Expand Up @@ -243,7 +243,7 @@ bool ProcessNewBlock(const CChainParams& chainparams, const std::shared_ptr<cons
* @param[in] chainparams The params for the chain we want to connect to
* @param[out] ppindex If set, the pointer will be set to point to the last new block index object for the given headers
*/
bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& block, CValidationState& state, const CChainParams& chainparams, CBlockIndex** ppindex=NULL);
bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& block, CValidationState& state, const CChainParams& chainparams, const CBlockIndex** ppindex=NULL);

/** Check whether enough disk space is available for an incoming block */
bool CheckDiskSpace(uint64_t nAdditionalBytes = 0);
Expand Down

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