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MDNS client changed to avoid that multiple Avahi resolvers try to resolve the same name and domain simultaneously

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This commit is contained in:
Andrea Bondavalli 2020-06-04 09:09:57 -07:00
parent e348400246
commit 0367dc33a0
2 changed files with 19 additions and 8 deletions
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24
daemon/mdns_client.cpp
View File

@ -108,6 +108,8 @@ void MDNSClient::resolve_callback(AvahiServiceResolver* r,
break;
}
/* remove the resolver from the active pool */
mdns.active_resolvers.erase(std::pair(name, domain));
avahi_service_resolver_free(r);
}
@ -135,18 +137,24 @@ void MDNSClient::browse_callback(AvahiServiceBrowser* b,
BOOST_LOG_TRIVIAL(info) << "mdns_client:: (Browser) NEW: "
<< "service " << name << " of type " << type
<< " in domain " << domain;
/* We ignore the returned resolver object. In the callback
function we free it. If the server is terminated before
the callback function is called the server will free
the resolver for us. */
if (!(avahi_service_resolver_new(mdns.client_.get(), interface, protocol,
name, type, domain, AVAHI_PROTO_UNSPEC,
AVAHI_LOOKUP_NO_TXT, resolve_callback,
&mdns))) {
/* check if a resolver is already running for this name and domain */
if (mdns.active_resolvers.find(std::pair(name, domain)) !=
mdns.active_resolvers.end()) {
/* if already running we don't run a new resolver */
BOOST_LOG_TRIVIAL(info)
<< "mdns_client:: (Browser): resolution already ongoing ...";
}
else if (!(avahi_service_resolver_new(mdns.client_.get(), interface,
protocol, name, type, domain,
AVAHI_PROTO_UNSPEC, AVAHI_LOOKUP_NO_TXT,
resolve_callback, &mdns))) {
BOOST_LOG_TRIVIAL(error)
<< "mdns_client:: "
<< "Failed to resolve service " << name << " : "
<< avahi_strerror(avahi_client_errno(mdns.client_.get()));
} else {
/* add the resolver to the active pool */
mdns.active_resolvers.insert(std::pair(name, domain));
}
break;

3
daemon/mdns_client.hpp
View File

@ -96,6 +96,9 @@ class MDNSClient {
AvahiClientState state,
void* userdata);
std::set<std::pair<std::string /*name*/, std::string /*domain */> >
active_resolvers;
#endif
};