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@ -400,7 +400,7 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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std::pair<std::string /* type url */, std::string /* resource name */>>; |
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// A struct representing a client's subscription to a particular resource.
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struct SubscriberState { |
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struct SubscriptionState { |
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// Version that the client currently knows about.
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int current_version = 0; |
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// The queue upon which to place updates when the resource is updated.
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@ -408,23 +408,25 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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}; |
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// A struct representing the a client's subscription to all the resources.
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using SubscriptionNameMap = |
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std::map<std::string /* resource_name */, SubscriptionState>; |
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using SubscriptionMap = |
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std::map<std::string /* type_url */, |
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std::map<std::string /* resource_name */, SubscriberState>>; |
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std::map<std::string /* type_url */, SubscriptionNameMap>; |
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// A struct representing the current state for a resource:
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// - the version of the resource that is set by the SetResource() methods.
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// - a list of subscribers interested in this resource.
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// - a list of subscriptions interested in this resource.
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struct ResourceState { |
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int version = 0; |
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absl::optional<google::protobuf::Any> resource; |
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std::set<SubscriberState*> subscribers; |
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std::set<SubscriptionState*> subscriptions; |
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}; |
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// A struct representing the current state for all resources:
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// LDS, CDS, EDS, and RDS for the class as a whole.
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using ResourcesMap = |
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std::map<std::string, std::map<std::string, ResourceState>>; |
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using ResourceNameMap = |
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std::map<std::string /* resource_name */, ResourceState>; |
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using ResourceMap = std::map<std::string /* type_url */, ResourceNameMap>; |
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AdsServiceImpl(bool enable_load_reporting) { |
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// Construct RDS response data.
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@ -475,101 +477,61 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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} |
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// Checks whether the client needs to receive a newer version of
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// the resource.
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bool ClientNeedsResourceUpdate(const string& resource_type, |
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const string& name, |
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SubscriptionMap* subscription_map) { |
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auto subscriber_it = (*subscription_map)[resource_type].find(name); |
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if (subscriber_it == (*subscription_map)[resource_type].end()) { |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Skipping an unsubscribed update for resource %s and " |
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"name %s", |
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this, resource_type.c_str(), name.c_str()); |
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return false; |
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} |
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const auto& resource_state = resources_map_[resource_type][name]; |
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if (subscriber_it->second.current_version < resource_state.version) { |
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subscriber_it->second.current_version = resource_state.version; |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Need to process new %s update %s, bring current to %d", |
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this, resource_type.c_str(), name.c_str(), |
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subscriber_it->second.current_version); |
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// the resource. If so, updates subscription_state->current_version and
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// returns true.
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bool ClientNeedsResourceUpdate(const ResourceState& resource_state, |
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SubscriptionState* subscription_state) { |
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if (subscription_state->current_version < resource_state.version) { |
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subscription_state->current_version = resource_state.version; |
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return true; |
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} else { |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Skipping an old %s update %s, current is at %d", this, |
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resource_type.c_str(), name.c_str(), |
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subscriber_it->second.current_version); |
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return false; |
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} |
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return false; |
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} |
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// Resource subscription:
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// 1. inserting an entry into the subscription map indexed by resource
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// type/name pair.
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// 2. inserting or updating an entry into the resources map indexed
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// by resource type/name pair about this subscription.
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void ResourceSubscribe(const std::string& resource_type, |
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const std::string& name, UpdateQueue* update_queue, |
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SubscriptionMap* subscription_map) { |
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SubscriberState& subscriber_state = |
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(*subscription_map)[resource_type][name]; |
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subscriber_state.update_queue = update_queue; |
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ResourceState& resource_state = resources_map_[resource_type][name]; |
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resource_state.subscribers.emplace(&subscriber_state); |
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gpr_log( |
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GPR_INFO, |
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"ADS[%p]: subscribe to resource type %s name %s version %d state %p", |
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this, resource_type.c_str(), name.c_str(), resource_state.version, |
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&subscriber_state); |
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} |
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// Resource unsubscription:
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// 1. update the entry in the resources map indexed
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// by resource type/name pair to remove this subscription
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// 2. remove this entry from the subscription map.
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// 3. remove this resource type from the subscription map if there are no more
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// resources subscribed for the resource type.
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void ResourceUnsubscribe(const std::string& resource_type, |
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const std::string& name, |
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SubscriptionMap* subscription_map) { |
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auto subscription_by_type_it = subscription_map->find(resource_type); |
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if (subscription_by_type_it == subscription_map->end()) { |
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gpr_log(GPR_INFO, "ADS[%p]: resource type %s not subscribed", this, |
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resource_type.c_str()); |
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return; |
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} |
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auto& subscription_by_type_map = subscription_by_type_it->second; |
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auto subscription_it = subscription_by_type_map.find(name); |
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if (subscription_it == subscription_by_type_map.end()) { |
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gpr_log(GPR_INFO, "ADS[%p]: resource name %s of type %s not subscribed", |
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this, name.c_str(), resource_type.c_str()); |
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return; |
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} |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Unsubscribe to resource type %s name %s state %p", this, |
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resource_type.c_str(), name.c_str(), &subscription_it->second); |
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auto resource_by_type_it = resources_map_.find(resource_type); |
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GPR_ASSERT(resource_by_type_it != resources_map_.end()); |
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auto& resource_by_type_map = resource_by_type_it->second; |
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auto resource_it = resource_by_type_map.find(name); |
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GPR_ASSERT(resource_it != resource_by_type_map.end()); |
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resource_it->second.subscribers.erase(&subscription_it->second); |
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if (resource_it->second.subscribers.empty() && |
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!resource_it->second.resource.has_value()) { |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Erasing resource type %s name %s from resource map " |
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"since there are no more subscribers for this unset resource", |
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this, resource_type.c_str(), name.c_str()); |
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resource_by_type_map.erase(resource_it); |
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} |
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subscription_by_type_map.erase(subscription_it); |
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if (subscription_by_type_map.empty()) { |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Erasing resource type %s from subscription_map", this, |
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resource_type.c_str()); |
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subscription_map->erase(subscription_by_type_it); |
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// Subscribes to a resource if not already subscribed:
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// 1. Sets the update_queue field in subscription_state.
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// 2. Adds subscription_state to resource_state->subscriptions.
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void MaybeSubscribe(const std::string& resource_type, |
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const std::string& resource_name, |
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SubscriptionState* subscription_state, |
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ResourceState* resource_state, |
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UpdateQueue* update_queue) { |
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if (subscription_state->update_queue != nullptr) return; |
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subscription_state->update_queue = update_queue; |
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resource_state->subscriptions.emplace(subscription_state); |
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gpr_log(GPR_INFO, "ADS[%p]: subscribe to resource type %s name %s state %p", |
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this, resource_type.c_str(), resource_name.c_str(), |
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&subscription_state); |
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} |
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// Removes subscriptions for resources no longer present in the
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// current request.
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void ProcessUnsubscriptions( |
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const std::string& resource_type, |
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const std::set<std::string>& resources_in_current_request, |
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SubscriptionNameMap* subscription_name_map, |
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ResourceNameMap* resource_name_map) { |
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for (auto it = subscription_name_map->begin(); |
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it != subscription_name_map->end();) { |
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const std::string& resource_name = it->first; |
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SubscriptionState& subscription_state = it->second; |
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if (resources_in_current_request.find(resource_name) != |
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resources_in_current_request.end()) { |
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++it; |
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continue; |
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} |
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gpr_log(GPR_INFO, "ADS[%p]: Unsubscribe to type=%s name=%s state=%p", |
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this, resource_type.c_str(), resource_name.c_str(), |
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&subscription_state); |
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auto resource_it = resource_name_map->find(resource_name); |
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GPR_ASSERT(resource_it != resource_name_map->end()); |
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auto& resource_state = resource_it->second; |
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resource_state.subscriptions.erase(&subscription_state); |
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if (resource_state.subscriptions.empty() && |
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!resource_state.resource.has_value()) { |
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resource_name_map->erase(resource_it); |
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} |
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it = subscription_name_map->erase(it); |
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} |
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} |
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@ -577,7 +539,7 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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// for all resources and by adding all subscribed resources for LDS and CDS.
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void CompleteBuildingDiscoveryResponse( |
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const std::string& resource_type, const int version, |
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const SubscriptionMap& subscription_map, |
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const SubscriptionNameMap& subscription_name_map, |
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const std::set<std::string>& resources_added_to_response, |
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DiscoveryResponse* response) { |
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resource_type_response_state_[resource_type] = SENT; |
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@ -587,18 +549,15 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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if (resource_type == kLdsTypeUrl || resource_type == kCdsTypeUrl) { |
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// For LDS and CDS we must send back all subscribed resources
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// (even the unchanged ones)
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auto subscription_map_by_type_it = subscription_map.find(resource_type); |
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GPR_ASSERT(subscription_map_by_type_it != subscription_map.end()); |
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for (const auto& subscription : subscription_map_by_type_it->second) { |
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if (resources_added_to_response.find(subscription.first) == |
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for (const auto& p : subscription_name_map) { |
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const std::string& resource_name = p.first; |
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if (resources_added_to_response.find(resource_name) == |
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resources_added_to_response.end()) { |
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absl::optional<google::protobuf::Any>& resource = |
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resources_map_[resource_type][subscription.first].resource; |
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if (resource.has_value()) { |
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response->add_resources()->CopyFrom(resource.value()); |
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} else { |
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gpr_log(GPR_INFO, "ADS[%p]: Unknown resource type %s and name %s", |
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this, resource_type.c_str(), subscription.first.c_str()); |
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const ResourceState& resource_state = |
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resource_map_[resource_type][resource_name]; |
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if (resource_state.resource.has_value()) { |
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response->add_resources()->CopyFrom( |
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resource_state.resource.value()); |
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} |
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} |
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} |
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@ -622,7 +581,6 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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// Resources that the client will be subscribed to keyed by resource type
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// url.
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SubscriptionMap subscription_map; |
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std::map<std::string, SubscriberState> subscriber_map; |
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// Current Version map keyed by resource type url.
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std::map<std::string, int> resource_type_version; |
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// Creating blocking thread to read from stream.
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@ -647,7 +605,8 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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DiscoveryRequest request = std::move(requests.front()); |
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requests.pop_front(); |
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did_work = true; |
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gpr_log(GPR_INFO, "ADS[%p]: Handling request %s with content %s", |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Received request for type %s with content %s", |
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this, request.type_url().c_str(), |
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request.DebugString().c_str()); |
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// Identify ACK and NACK by looking for version information and
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@ -667,58 +626,51 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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// 3. unsubscribe if necessary
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if (resource_types_to_ignore_.find(request.type_url()) == |
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resource_types_to_ignore_.end()) { |
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auto& subscription_name_map = |
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subscription_map[request.type_url()]; |
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auto& resource_name_map = resource_map_[request.type_url()]; |
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std::set<std::string> resources_in_current_request; |
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std::set<std::string> resources_added_to_response; |
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for (const std::string& resource_name : |
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request.resource_names()) { |
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resources_in_current_request.emplace(resource_name); |
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auto subscriber_it = |
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subscription_map[request.type_url()].find(resource_name); |
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if (subscriber_it == |
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subscription_map[request.type_url()].end()) { |
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ResourceSubscribe(request.type_url(), resource_name, |
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&update_queue, &subscription_map); |
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} |
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if (ClientNeedsResourceUpdate(request.type_url(), resource_name, |
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&subscription_map)) { |
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auto& subscription_state = subscription_name_map[resource_name]; |
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auto& resource_state = resource_name_map[resource_name]; |
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MaybeSubscribe(request.type_url(), resource_name, |
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&subscription_state, &resource_state, |
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&update_queue); |
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if (ClientNeedsResourceUpdate(resource_state, |
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&subscription_state)) { |
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gpr_log( |
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GPR_INFO, |
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"ADS[%p]: Sending update for type=%s name=%s version=%d", |
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this, request.type_url().c_str(), resource_name.c_str(), |
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resource_state.version); |
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resources_added_to_response.emplace(resource_name); |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Handling resource type %s and name %s", |
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this, request.type_url().c_str(), |
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resource_name.c_str()); |
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auto resource = |
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resources_map_[request.type_url()][resource_name]; |
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GPR_ASSERT(resource.resource.has_value()); |
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response.add_resources()->CopyFrom(resource.resource.value()); |
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} |
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} |
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// Remove subscriptions no longer requested: build a list of
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// unsubscriber names first while iterating the subscription_map
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// and then erase from the subscription_map in
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// ResourceUnsubscribe.
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std::set<std::string> unsubscriber_list; |
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for (const auto& subscription : |
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subscription_map[request.type_url()]) { |
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if (resources_in_current_request.find(subscription.first) == |
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resources_in_current_request.end()) { |
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unsubscriber_list.emplace(subscription.first); |
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if (resource_state.resource.has_value()) { |
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response.add_resources()->CopyFrom( |
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resource_state.resource.value()); |
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} |
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} |
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} |
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for (const auto& name : unsubscriber_list) { |
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ResourceUnsubscribe(request.type_url(), name, |
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&subscription_map); |
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} |
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if (!response.resources().empty()) { |
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// Process unsubscriptions for any resource no longer
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// present in the request's resource list.
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ProcessUnsubscriptions( |
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request.type_url(), resources_in_current_request, |
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&subscription_name_map, &resource_name_map); |
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// Send response if needed.
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if (!resources_added_to_response.empty()) { |
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CompleteBuildingDiscoveryResponse( |
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request.type_url(), |
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++resource_type_version[request.type_url()], |
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subscription_map, resources_added_to_response, &response); |
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subscription_name_map, resources_added_to_response, |
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&response); |
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} |
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} |
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} |
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} |
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if (!response.resources().empty()) { |
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gpr_log(GPR_INFO, "ADS[%p]: sending request response '%s'", this, |
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gpr_log(GPR_INFO, "ADS[%p]: Sending response: %s", this, |
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response.DebugString().c_str()); |
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stream->Write(response); |
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} |
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@ -727,32 +679,40 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
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{ |
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grpc_core::MutexLock lock(&ads_mu_); |
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if (!update_queue.empty()) { |
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std::pair<std::string, std::string> update = |
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std::move(update_queue.front()); |
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const std::string resource_type = |
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std::move(update_queue.front().first); |
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const std::string resource_name = |
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std::move(update_queue.front().second); |
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update_queue.pop_front(); |
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did_work = true; |
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gpr_log(GPR_INFO, "ADS[%p]: Handling update type %s name %s", this, |
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update.first.c_str(), update.second.c_str()); |
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auto subscriber_it = |
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subscription_map[update.first].find(update.second); |
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if (subscriber_it != subscription_map[update.first].end()) { |
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if (ClientNeedsResourceUpdate(update.first, update.second, |
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&subscription_map)) { |
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gpr_log(GPR_INFO, |
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"ADS[%p]: Updating resource type %s and name %s", this, |
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update.first.c_str(), update.second.c_str()); |
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auto resource = resources_map_[update.first][update.second]; |
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GPR_ASSERT(resource.resource.has_value()); |
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response.add_resources()->CopyFrom(resource.resource.value()); |
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|
CompleteBuildingDiscoveryResponse( |
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update.first, ++resource_type_version[update.first], |
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|
subscription_map, {update.second}, &response); |
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gpr_log(GPR_INFO, "ADS[%p]: Received update for type=%s name=%s", |
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|
this, resource_type.c_str(), resource_name.c_str()); |
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auto& subscription_name_map = subscription_map[resource_type]; |
|
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|
auto& resource_name_map = resource_map_[resource_type]; |
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|
|
auto it = subscription_name_map.find(resource_name); |
|
|
|
|
if (it != subscription_name_map.end()) { |
|
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|
|
SubscriptionState& subscription_state = it->second; |
|
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|
|
ResourceState& resource_state = resource_name_map[resource_name]; |
|
|
|
|
if (ClientNeedsResourceUpdate(resource_state, |
|
|
|
|
&subscription_state)) { |
|
|
|
|
gpr_log( |
|
|
|
|
GPR_INFO, |
|
|
|
|
"ADS[%p]: Sending update for type=%s name=%s version=%d", |
|
|
|
|
this, resource_type.c_str(), resource_name.c_str(), |
|
|
|
|
resource_state.version); |
|
|
|
|
if (resource_state.resource.has_value()) { |
|
|
|
|
response.add_resources()->CopyFrom( |
|
|
|
|
resource_state.resource.value()); |
|
|
|
|
CompleteBuildingDiscoveryResponse( |
|
|
|
|
resource_type, ++resource_type_version[resource_type], |
|
|
|
|
subscription_name_map, {resource_name}, &response); |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
if (!response.resources().empty()) { |
|
|
|
|
gpr_log(GPR_INFO, "ADS[%p]: sending update response '%s'", this, |
|
|
|
|
gpr_log(GPR_INFO, "ADS[%p]: Sending update response: %s", this, |
|
|
|
|
response.DebugString().c_str()); |
|
|
|
|
stream->Write(response); |
|
|
|
|
} |
|
|
|
|
@ -808,13 +768,13 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
|
|
|
|
void SetResource(google::protobuf::Any resource, const std::string& type_url, |
|
|
|
|
const std::string& name) { |
|
|
|
|
grpc_core::MutexLock lock(&ads_mu_); |
|
|
|
|
ResourceState& state = resources_map_[type_url][name]; |
|
|
|
|
ResourceState& state = resource_map_[type_url][name]; |
|
|
|
|
++state.version; |
|
|
|
|
state.resource = std::move(resource); |
|
|
|
|
gpr_log(GPR_INFO, "ADS[%p]: Updating %s resource %s to version %u", this, |
|
|
|
|
type_url.c_str(), name.c_str(), state.version); |
|
|
|
|
for (SubscriberState* subscriber : state.subscribers) { |
|
|
|
|
subscriber->update_queue->emplace_back(type_url, name); |
|
|
|
|
for (SubscriptionState* subscription : state.subscriptions) { |
|
|
|
|
subscription->update_queue->emplace_back(type_url, name); |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
@ -873,15 +833,17 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
|
|
|
|
{ |
|
|
|
|
grpc_core::MutexLock lock(&ads_mu_); |
|
|
|
|
NotifyDoneWithAdsCallLocked(); |
|
|
|
|
resources_map_.clear(); |
|
|
|
|
resource_map_.clear(); |
|
|
|
|
resource_type_response_state_.clear(); |
|
|
|
|
} |
|
|
|
|
gpr_log(GPR_INFO, "ADS[%p]: shut down", this); |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
static ClusterLoadAssignment BuildEdsResource(const EdsResourceArgs& args) { |
|
|
|
|
static ClusterLoadAssignment BuildEdsResource( |
|
|
|
|
const EdsResourceArgs& args, |
|
|
|
|
const char* cluster_name = kDefaultResourceName) { |
|
|
|
|
ClusterLoadAssignment assignment; |
|
|
|
|
assignment.set_cluster_name(kDefaultResourceName); |
|
|
|
|
assignment.set_cluster_name(cluster_name); |
|
|
|
|
for (const auto& locality : args.locality_list) { |
|
|
|
|
auto* endpoints = assignment.add_endpoints(); |
|
|
|
|
endpoints->mutable_load_balancing_weight()->set_value(locality.lb_weight); |
|
|
|
|
@ -946,8 +908,8 @@ class AdsServiceImpl : public AggregatedDiscoveryService::Service, |
|
|
|
|
// Note that an entry will exist whenever either of the following is true:
|
|
|
|
|
// - The resource exists (i.e., has been created by SetResource() and has not
|
|
|
|
|
// yet been destroyed by UnsetResource()).
|
|
|
|
|
// - There is at least one subscriber for the resource.
|
|
|
|
|
ResourcesMap resources_map_; |
|
|
|
|
// - There is at least one subscription for the resource.
|
|
|
|
|
ResourceMap resource_map_; |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
class LrsServiceImpl : public LrsService, |
|
|
|
|
|
Karthik Ravi Shankar
5 years ago