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Replace relevant services logic with a function suite.

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Adds HasAllRelevantServices and GetRelevantServices, which check
for NETWORK|WITNESS.

This changes the following:
 * Removes nRelevantServices from CConnman, disconnecting it a bit
   more from protocol-level logic.
 * Replaces our sometimes-connect-to-!WITNESS-nodes logic with
   simply always requiring WITNESS|NETWORK for outbound non-feeler
   connections (feelers still only require NETWORK).
 * This has the added benefit of removing nServicesExpected from
   CNode - instead letting net_processing's VERSION message
   handling simply check HasAllRelevantServices.
 * This implies we believe WITNESS nodes to continue to be a
   significant majority of nodes on the network, but also because
   we cannot sync properly from !WITNESS nodes, it is strange to
   continue using our valuable outbound slots on them.
 * In order to prevent this change from preventing connection to
   -connect= nodes which have !WITNESS, -connect nodes are now
   given the "addnode" flag. This also allows outbound connections
   to !NODE_NETWORK nodes for -connect nodes (which was already true
   of addnodes).
 * Has the (somewhat unintended) consequence of changing one of the
   eviction metrics from the same
   sometimes-connect-to-!WITNESS-nodes metric to requiring
   HasRelevantServices.

This should make NODE_NETWORK_LIMITED much simpler to implement.
This commit is contained in:
Matt Corallo
2017-10-04 17:59:30 -04:00
parent 167cef8082
commit 44407100ff
6 changed files with 55 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/net.h
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@@ -84,8 +84,6 @@ static const bool DEFAULT_FORCEDNSSEED = false;
static const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000;
static const size_t DEFAULT_MAXSENDBUFFER = 1 * 1000;
static const ServiceFlags REQUIRED_SERVICES = NODE_NETWORK;
// NOTE: When adjusting this, update rpcnet:setban's help ("24h")
static const unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24; // Default 24-hour ban
@@ -130,7 +128,6 @@ public:
struct Options
{
ServiceFlags nLocalServices = NODE_NONE;
ServiceFlags nRelevantServices = NODE_NONE;
int nMaxConnections = 0;
int nMaxOutbound = 0;
int nMaxAddnode = 0;
@@ -152,7 +149,6 @@ public:
void Init(const Options& connOptions) {
nLocalServices = connOptions.nLocalServices;
nRelevantServices = connOptions.nRelevantServices;
nMaxConnections = connOptions.nMaxConnections;
nMaxOutbound = std::min(connOptions.nMaxOutbound, connOptions.nMaxConnections);
nMaxAddnode = connOptions.nMaxAddnode;
@@ -390,9 +386,6 @@ private:
/** Services this instance offers */
ServiceFlags nLocalServices;
/** Services this instance cares about */
ServiceFlags nRelevantServices;
CSemaphore *semOutbound;
CSemaphore *semAddnode;
int nMaxConnections;
@@ -585,7 +578,6 @@ class CNode
public:
// socket
std::atomic<ServiceFlags> nServices;
ServiceFlags nServicesExpected;
SOCKET hSocket;
size_t nSendSize; // total size of all vSendMsg entries
size_t nSendOffset; // offset inside the first vSendMsg already sent