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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "subsetservicepolicy.h"
#include <vespa/documentapi/messagebus/documentprotocol.h>
#include <vespa/messagebus/routing/verbatimdirective.h>
#include <vespa/messagebus/messagebus.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/stllike/hash_fun.h>
#include <vespa/log/log.h>
LOG_SETUP(".subsetservicepolicy");
namespace documentapi {
SubsetServicePolicy::CacheEntry::CacheEntry() :
_offset(0),
_generation(0),
_recipients()
{
// empty
}
SubsetServicePolicy::SubsetServicePolicy(const string ¶m) :
_subsetSize(5),
_cache()
{
if (param.length() > 0) {
int size = atoi(param.c_str());
if (size >= 0) {
_subsetSize = (uint32_t)size;
} else {
LOG(warning,
"Ignoring a request to set the subset size to %d because it makes no sense. "
"This routing policy will choose any one matching service.", size);
}
} else {
LOG(warning, "No parameter given to SubsetService policy, using default value %d.", _subsetSize);
}
}
SubsetServicePolicy::~SubsetServicePolicy() = default;
void
SubsetServicePolicy::select(mbus::RoutingContext &context)
{
mbus::Route route = context.getRoute();
route.setHop(0, getRecipient(context));
context.addChild(route);
}
void
SubsetServicePolicy::merge(mbus::RoutingContext &context)
{
DocumentProtocol::merge(context);
}
string
SubsetServicePolicy::getCacheKey(const mbus::RoutingContext &ctx) const
{
return ctx.getRoute().getHop(0).toString();
}
mbus::Hop
SubsetServicePolicy::getRecipient(mbus::RoutingContext &ctx)
{
mbus::Hop hop;
if (_subsetSize > 0) {
std::lock_guard guard(_lock);
CacheEntry &entry = update(ctx);
if (!entry._recipients.empty()) {
if (++entry._offset >= entry._recipients.size()) {
entry._offset = 0;
}
hop = entry._recipients[entry._offset];
}
}
if (!hop.hasDirectives()) {
hop = ctx.getRoute().getHop(0);
hop.setDirective(ctx.getDirectiveIndex(),std::make_shared<mbus::VerbatimDirective>("*"));
}
return hop;
}
SubsetServicePolicy::CacheEntry &
SubsetServicePolicy::update(mbus::RoutingContext &ctx)
{
uint32_t upd = ctx.getMirror().updates();
CacheEntry &entry = _cache.insert(std::map<string, CacheEntry>::value_type(getCacheKey(ctx), CacheEntry())).first->second;
if (entry._generation != upd) {
entry._generation = upd;
entry._recipients.clear();
string pattern = vespalib::make_string("%s*%s",
ctx.getHopPrefix().c_str(),
ctx.getHopSuffix().c_str());
slobrok::api::IMirrorAPI::SpecList entries = ctx.getMirror().lookup(pattern);
uint32_t pos = vespalib::hashValue(ctx.getMessageBus().getConnectionSpec().c_str());
for (uint32_t i = 0; i < _subsetSize && i < entries.size(); ++i) {
entry._recipients.push_back(mbus::Hop::parse(entries[(pos + i) % entries.size()].first));
}
}
return entry;
}
}
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