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dhtrunner: recover from network changes

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Using a list of bootstrap nodes, we recover from network loss by pinging those
nodes continuously until connected.
Written with Simon Désaulniers.
This commit is contained in:
Adrien Béraud committed 2016-10-10 01:51:26 -04:00
1 parent bb74dc846c
commit 64118404fe
3 files changed
+131 -15
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src/dht.cpp
+8 -8
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@@ -2385,9 +2385,8 @@ Dht::getNodesStats(sa_family_t af, unsigned *good_return, unsigned *dubious_retu
good++;
if (n->time > n->reply_time)
incoming++;
} else {
} else if (not n->isExpired())
dubious++;
}
}
if (b.cached)
cached++;
@@ -2669,11 +2668,12 @@ Dht::neighbourhoodMaintenance(RoutingTable& list)
q = r;
}
/* Since our node-id is the same in both DHTs, it's probably
profitable to query both families. */
auto n = q->randomNode();
if (n) {
DHT_LOG.DEBUG("[find %s IPv%c] sending find for neighborhood maintenance.", id.toString().c_str(), q->af == AF_INET6 ? '6' : '4');
DHT_LOG.DEBUG("[find %s IPv%c] sending find for neighborhood maintenance.",
id.toString().c_str(), q->af == AF_INET6 ? '6' : '4');
/* Since our node-id is the same in both DHTs, it's probably
profitable to query both families. */
network_engine.sendFindNode(n, id, network_engine.want(), nullptr, nullptr);
}
@@ -2876,9 +2876,9 @@ Dht::confirmNodes()
case is roughly 27 seconds, assuming the table is 22 bits deep.
We want to keep a margin for neighborhood maintenance, so keep
this within 25 seconds. */
auto time_dis = soon ?
uniform_duration_distribution<> {seconds(5) , seconds(25)}
: uniform_duration_distribution<> {seconds(60), seconds(180)};
auto time_dis = soon
? uniform_duration_distribution<> {seconds(5) , seconds(25)}
: uniform_duration_distribution<> {seconds(60), seconds(180)};
auto confirm_nodes_time = now + time_dis(rd);
nextNodesConfirmation = scheduler.add(confirm_nodes_time, std::bind(&Dht::confirmNodes, this));