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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "loadbalancerpolicy.h"
#include <vespa/messagebus/emptyreply.h>
#include <vespa/messagebus/errorcode.h>
#include <vespa/messagebus/error.h>
#include <vespa/messagebus/routing/ihopdirective.h>
#include <vespa/messagebus/routing/routingcontext.h>
#include <vespa/messagebus/routing/verbatimdirective.h>
#include <vespa/log/log.h>
LOG_SETUP(".loadbalancerpolicy");
namespace documentapi {
LoadBalancerPolicy::LoadBalancerPolicy(const string& param)
: ExternSlobrokPolicy(parse(param))
{
std::map<string, string> params(parse(param));
if (params.find("cluster") != params.end()) {
_cluster = params.find("cluster")->second;
} else {
_error = "Required parameter cluster not set";
return;
}
if (params.find("session") != params.end()) {
_session = params.find("session")->second;
} else {
_error = "Required parameter session not set";
return;
}
_pattern = _cluster + "/*/" + _session;
_loadBalancer.reset(new LoadBalancer(_cluster, _session));
}
void
LoadBalancerPolicy::doSelect(mbus::RoutingContext& context) {
std::pair<string, int> node = getRecipient(context);
if (node.second != -1) {
context.setContext((uint64_t)node.second);
mbus::Route route = context.getRoute();
route.setHop(0, mbus::Hop::parse(node.first + "/" + _session));
context.addChild(route);
} else {
context.setError(mbus::ErrorCode::NO_ADDRESS_FOR_SERVICE,
"Could not resolve any nodes to send to in pattern " + _pattern);
}
}
void
LoadBalancerPolicy::merge(mbus::RoutingContext& context) {
mbus::RoutingNodeIterator it = context.getChildIterator();
mbus::Reply::UP reply = it.removeReply();
uint64_t target = context.getContext().value.UINT64;
bool busy = false;
for (uint32_t i = 0; i < reply->getNumErrors(); i++) {
if (reply->getError(i).getCode() == mbus::ErrorCode::SESSION_BUSY) {
string lastSpec = _loadBalancer->getLastSpec(target);
if (reply->getError(i).getMessage().find(lastSpec) == string::npos) {
LOG(debug, "Received busy with message %s, doesn't contain target %s so not updating weight.", reply->getError(i).getMessage().c_str(), lastSpec.c_str());
} else {
LOG(debug, "Received busy for target node %d reducing weight of that node.", (int)target);
busy = true;
}
}
}
_loadBalancer->received(target, busy);
context.setReply(std::move(reply));
}
}
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