mirror of https://github.com/grpc/grpc.git
Merge pull request #24287 from markdroth/xds_drop_policy
Move EDS drop handling to a new eds_drop LB policy.pull/24291/head
Mark D. Roth
4 years ago
committed by
GitHub
commit
24f54fbb4b
19 changed files with 656 additions and 49 deletions
@ -0,0 +1,571 @@ |
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//
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// Copyright 2018 gRPC authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include <grpc/support/port_platform.h> |
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#include "absl/strings/string_view.h" |
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#include <grpc/grpc.h> |
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#include "src/core/ext/filters/client_channel/lb_policy.h" |
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#include "src/core/ext/filters/client_channel/lb_policy/child_policy_handler.h" |
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#include "src/core/ext/filters/client_channel/lb_policy_factory.h" |
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#include "src/core/ext/filters/client_channel/lb_policy_registry.h" |
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#include "src/core/ext/xds/xds_client.h" |
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#include "src/core/ext/xds/xds_client_stats.h" |
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#include "src/core/lib/channel/channel_args.h" |
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#include "src/core/lib/gpr/string.h" |
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#include "src/core/lib/gprpp/orphanable.h" |
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#include "src/core/lib/gprpp/ref_counted_ptr.h" |
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#include "src/core/lib/iomgr/work_serializer.h" |
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namespace grpc_core { |
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TraceFlag grpc_eds_drop_lb_trace(false, "eds_drop_lb"); |
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namespace { |
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constexpr char kEdsDrop[] = "eds_drop_experimental"; |
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// Config for EDS drop LB policy.
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class EdsDropLbConfig : public LoadBalancingPolicy::Config { |
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public: |
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EdsDropLbConfig(RefCountedPtr<LoadBalancingPolicy::Config> child_policy, |
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std::string cluster_name, std::string eds_service_name, |
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absl::optional<std::string> lrs_load_reporting_server_name, |
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RefCountedPtr<XdsApi::EdsUpdate::DropConfig> drop_config) |
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: child_policy_(std::move(child_policy)), |
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cluster_name_(std::move(cluster_name)), |
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eds_service_name_(std::move(eds_service_name)), |
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lrs_load_reporting_server_name_( |
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std::move(lrs_load_reporting_server_name)), |
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drop_config_(std::move(drop_config)) {} |
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const char* name() const override { return kEdsDrop; } |
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RefCountedPtr<LoadBalancingPolicy::Config> child_policy() const { |
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return child_policy_; |
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} |
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const std::string& cluster_name() const { return cluster_name_; } |
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const std::string& eds_service_name() const { return eds_service_name_; } |
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const absl::optional<std::string>& lrs_load_reporting_server_name() const { |
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return lrs_load_reporting_server_name_; |
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}; |
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RefCountedPtr<XdsApi::EdsUpdate::DropConfig> drop_config() const { |
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return drop_config_; |
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} |
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private: |
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RefCountedPtr<LoadBalancingPolicy::Config> child_policy_; |
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std::string cluster_name_; |
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std::string eds_service_name_; |
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absl::optional<std::string> lrs_load_reporting_server_name_; |
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RefCountedPtr<XdsApi::EdsUpdate::DropConfig> drop_config_; |
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}; |
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// EDS Drop LB policy.
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class EdsDropLb : public LoadBalancingPolicy { |
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public: |
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EdsDropLb(RefCountedPtr<XdsClient> xds_client, Args args); |
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const char* name() const override { return kEdsDrop; } |
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void UpdateLocked(UpdateArgs args) override; |
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void ExitIdleLocked() override; |
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void ResetBackoffLocked() override; |
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private: |
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// A simple wrapper for ref-counting a picker from the child policy.
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class RefCountedPicker : public RefCounted<RefCountedPicker> { |
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public: |
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explicit RefCountedPicker(std::unique_ptr<SubchannelPicker> picker) |
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: picker_(std::move(picker)) {} |
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PickResult Pick(PickArgs args) { return picker_->Pick(args); } |
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private: |
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std::unique_ptr<SubchannelPicker> picker_; |
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}; |
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// A picker that wraps the picker from the child to perform drops.
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class DropPicker : public SubchannelPicker { |
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public: |
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DropPicker(EdsDropLb* eds_drop_lb, RefCountedPtr<RefCountedPicker> picker) |
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: drop_config_(eds_drop_lb->config_->drop_config()), |
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drop_stats_(eds_drop_lb->drop_stats_), |
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picker_(std::move(picker)) {} |
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PickResult Pick(PickArgs args); |
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private: |
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RefCountedPtr<XdsApi::EdsUpdate::DropConfig> drop_config_; |
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RefCountedPtr<XdsClusterDropStats> drop_stats_; |
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RefCountedPtr<RefCountedPicker> picker_; |
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}; |
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class Helper : public ChannelControlHelper { |
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public: |
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explicit Helper(RefCountedPtr<EdsDropLb> eds_drop_policy) |
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: eds_drop_policy_(std::move(eds_drop_policy)) {} |
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~Helper() { eds_drop_policy_.reset(DEBUG_LOCATION, "Helper"); } |
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RefCountedPtr<SubchannelInterface> CreateSubchannel( |
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ServerAddress address, const grpc_channel_args& args) override; |
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void UpdateState(grpc_connectivity_state state, const absl::Status& status, |
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std::unique_ptr<SubchannelPicker> picker) override; |
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void RequestReresolution() override; |
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void AddTraceEvent(TraceSeverity severity, |
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absl::string_view message) override; |
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private: |
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RefCountedPtr<EdsDropLb> eds_drop_policy_; |
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}; |
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~EdsDropLb(); |
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void ShutdownLocked() override; |
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OrphanablePtr<LoadBalancingPolicy> CreateChildPolicyLocked( |
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const grpc_channel_args* args); |
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void UpdateChildPolicyLocked(ServerAddressList addresses, |
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const grpc_channel_args* args); |
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void MaybeUpdatePickerLocked(); |
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// Current config from the resolver.
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RefCountedPtr<EdsDropLbConfig> config_; |
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// Internal state.
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bool shutting_down_ = false; |
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// The xds client.
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RefCountedPtr<XdsClient> xds_client_; |
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// The stats for client-side load reporting.
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RefCountedPtr<XdsClusterDropStats> drop_stats_; |
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OrphanablePtr<LoadBalancingPolicy> child_policy_; |
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// Latest state and picker reported by the child policy.
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grpc_connectivity_state state_ = GRPC_CHANNEL_IDLE; |
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absl::Status status_; |
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RefCountedPtr<RefCountedPicker> picker_; |
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}; |
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//
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// EdsDropLb::DropPicker
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//
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LoadBalancingPolicy::PickResult EdsDropLb::DropPicker::Pick( |
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LoadBalancingPolicy::PickArgs args) { |
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// Handle drop.
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const std::string* drop_category; |
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if (drop_config_->ShouldDrop(&drop_category)) { |
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if (drop_stats_ != nullptr) drop_stats_->AddCallDropped(*drop_category); |
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PickResult result; |
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result.type = PickResult::PICK_COMPLETE; |
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return result; |
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} |
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// If we're not dropping the call, we should always have a child picker.
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if (picker_ == nullptr) { // Should never happen.
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PickResult result; |
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result.type = PickResult::PICK_FAILED; |
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result.error = |
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grpc_error_set_int(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
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"eds_drop picker not given any child picker"), |
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GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_INTERNAL); |
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return result; |
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} |
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// Not dropping, so delegate to child picker.
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return picker_->Pick(args); |
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} |
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//
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// EdsDropLb
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//
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EdsDropLb::EdsDropLb(RefCountedPtr<XdsClient> xds_client, Args args) |
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: LoadBalancingPolicy(std::move(args)), xds_client_(std::move(xds_client)) { |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, "[eds_drop_lb %p] created -- using xds client %p", this, |
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xds_client_.get()); |
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} |
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} |
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EdsDropLb::~EdsDropLb() { |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, "[eds_drop_lb %p] destroying xds LB policy", this); |
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} |
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} |
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void EdsDropLb::ShutdownLocked() { |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, "[eds_drop_lb %p] shutting down", this); |
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} |
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shutting_down_ = true; |
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// Remove the child policy's interested_parties pollset_set from the
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// xDS policy.
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if (child_policy_ != nullptr) { |
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grpc_pollset_set_del_pollset_set(child_policy_->interested_parties(), |
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interested_parties()); |
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child_policy_.reset(); |
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} |
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// Drop our ref to the child's picker, in case it's holding a ref to
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// the child.
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picker_.reset(); |
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drop_stats_.reset(); |
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xds_client_.reset(); |
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} |
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void EdsDropLb::ExitIdleLocked() { |
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if (child_policy_ != nullptr) child_policy_->ExitIdleLocked(); |
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} |
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void EdsDropLb::ResetBackoffLocked() { |
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// The XdsClient will have its backoff reset by the xds resolver, so we
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// don't need to do it here.
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if (child_policy_ != nullptr) child_policy_->ResetBackoffLocked(); |
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} |
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void EdsDropLb::UpdateLocked(UpdateArgs args) { |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, "[eds_drop_lb %p] Received update", this); |
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} |
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// Update config.
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auto old_config = std::move(config_); |
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config_ = std::move(args.config); |
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// Update load reporting if needed.
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if (old_config == nullptr || |
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config_->lrs_load_reporting_server_name() != |
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old_config->lrs_load_reporting_server_name() || |
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config_->cluster_name() != old_config->cluster_name() || |
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config_->eds_service_name() != old_config->eds_service_name()) { |
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drop_stats_.reset(); |
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if (config_->lrs_load_reporting_server_name().has_value()) { |
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drop_stats_ = xds_client_->AddClusterDropStats( |
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config_->lrs_load_reporting_server_name().value(), |
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config_->cluster_name(), config_->eds_service_name()); |
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} |
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MaybeUpdatePickerLocked(); |
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} |
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// Update child policy.
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UpdateChildPolicyLocked(std::move(args.addresses), args.args); |
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args.args = nullptr; |
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} |
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void EdsDropLb::MaybeUpdatePickerLocked() { |
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// If we're dropping all calls, report READY, regardless of what (or
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// whether) the child has reported.
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if (config_->drop_config() != nullptr && config_->drop_config()->drop_all()) { |
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auto drop_picker = absl::make_unique<DropPicker>(this, picker_); |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, |
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"[eds_drop_lb %p] updating connectivity (drop all): state=READY " |
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"picker=%p", |
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this, drop_picker.get()); |
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} |
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channel_control_helper()->UpdateState(GRPC_CHANNEL_READY, absl::Status(), |
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std::move(drop_picker)); |
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return; |
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} |
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// Otherwise, update only if we have a child picker.
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if (picker_ != nullptr) { |
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auto drop_picker = absl::make_unique<DropPicker>(this, picker_); |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, |
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"[eds_drop_lb %p] updating connectivity: state=%s status=(%s) " |
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"picker=%p", |
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this, ConnectivityStateName(state_), status_.ToString().c_str(), |
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drop_picker.get()); |
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} |
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channel_control_helper()->UpdateState(state_, status_, |
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std::move(drop_picker)); |
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} |
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} |
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OrphanablePtr<LoadBalancingPolicy> EdsDropLb::CreateChildPolicyLocked( |
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const grpc_channel_args* args) { |
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LoadBalancingPolicy::Args lb_policy_args; |
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lb_policy_args.work_serializer = work_serializer(); |
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lb_policy_args.args = args; |
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lb_policy_args.channel_control_helper = |
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absl::make_unique<Helper>(Ref(DEBUG_LOCATION, "Helper")); |
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OrphanablePtr<LoadBalancingPolicy> lb_policy = |
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MakeOrphanable<ChildPolicyHandler>(std::move(lb_policy_args), |
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&grpc_eds_drop_lb_trace); |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, "[eds_drop_lb %p] Created new child policy handler %p", |
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this, lb_policy.get()); |
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} |
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// Add our interested_parties pollset_set to that of the newly created
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// child policy. This will make the child policy progress upon activity on
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// this policy, which in turn is tied to the application's call.
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grpc_pollset_set_add_pollset_set(lb_policy->interested_parties(), |
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interested_parties()); |
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return lb_policy; |
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} |
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void EdsDropLb::UpdateChildPolicyLocked(ServerAddressList addresses, |
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const grpc_channel_args* args) { |
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// Create policy if needed.
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if (child_policy_ == nullptr) { |
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child_policy_ = CreateChildPolicyLocked(args); |
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} |
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// Construct update args.
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UpdateArgs update_args; |
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update_args.addresses = std::move(addresses); |
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update_args.config = config_->child_policy(); |
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update_args.args = args; |
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// Update the policy.
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, "[eds_drop_lb %p] Updating child policy handler %p", this, |
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child_policy_.get()); |
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} |
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child_policy_->UpdateLocked(std::move(update_args)); |
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} |
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//
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// EdsDropLb::Helper
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//
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RefCountedPtr<SubchannelInterface> EdsDropLb::Helper::CreateSubchannel( |
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ServerAddress address, const grpc_channel_args& args) { |
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if (eds_drop_policy_->shutting_down_) return nullptr; |
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return eds_drop_policy_->channel_control_helper()->CreateSubchannel( |
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std::move(address), args); |
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} |
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void EdsDropLb::Helper::UpdateState(grpc_connectivity_state state, |
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const absl::Status& status, |
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std::unique_ptr<SubchannelPicker> picker) { |
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if (eds_drop_policy_->shutting_down_) return; |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_eds_drop_lb_trace)) { |
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gpr_log(GPR_INFO, |
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"[eds_drop_lb %p] child connectivity state update: state=%s (%s) " |
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"picker=%p", |
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eds_drop_policy_.get(), ConnectivityStateName(state), |
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status.ToString().c_str(), picker.get()); |
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} |
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// Save the state and picker.
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eds_drop_policy_->state_ = state; |
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eds_drop_policy_->status_ = status; |
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eds_drop_policy_->picker_ = |
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MakeRefCounted<RefCountedPicker>(std::move(picker)); |
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// Wrap the picker and return it to the channel.
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eds_drop_policy_->MaybeUpdatePickerLocked(); |
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} |
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void EdsDropLb::Helper::RequestReresolution() { |
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if (eds_drop_policy_->shutting_down_) return; |
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eds_drop_policy_->channel_control_helper()->RequestReresolution(); |
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} |
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void EdsDropLb::Helper::AddTraceEvent(TraceSeverity severity, |
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absl::string_view message) { |
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if (eds_drop_policy_->shutting_down_) return; |
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eds_drop_policy_->channel_control_helper()->AddTraceEvent(severity, message); |
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} |
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//
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// factory
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//
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class EdsDropLbFactory : public LoadBalancingPolicyFactory { |
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public: |
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OrphanablePtr<LoadBalancingPolicy> CreateLoadBalancingPolicy( |
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LoadBalancingPolicy::Args args) const override { |
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grpc_error* error = GRPC_ERROR_NONE; |
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RefCountedPtr<XdsClient> xds_client = XdsClient::GetOrCreate(&error); |
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if (error != GRPC_ERROR_NONE) { |
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gpr_log(GPR_ERROR, |
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"cannot get XdsClient to instantiate eds_drop LB policy: %s", |
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grpc_error_string(error)); |
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GRPC_ERROR_UNREF(error); |
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return nullptr; |
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} |
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return MakeOrphanable<EdsDropLb>(std::move(xds_client), std::move(args)); |
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} |
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const char* name() const override { return kEdsDrop; } |
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RefCountedPtr<LoadBalancingPolicy::Config> ParseLoadBalancingConfig( |
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const Json& json, grpc_error** error) const override { |
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GPR_DEBUG_ASSERT(error != nullptr && *error == GRPC_ERROR_NONE); |
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if (json.type() == Json::Type::JSON_NULL) { |
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// This policy was configured in the deprecated loadBalancingPolicy
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// field or in the client API.
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*error = GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
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"field:loadBalancingPolicy error:eds_drop policy requires " |
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"configuration. Please use loadBalancingConfig field of service " |
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"config instead."); |
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return nullptr; |
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} |
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std::vector<grpc_error*> error_list; |
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// Child policy.
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RefCountedPtr<LoadBalancingPolicy::Config> child_policy; |
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auto it = json.object_value().find("childPolicy"); |
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if (it == json.object_value().end()) { |
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error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
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"field:childPolicy error:required field missing")); |
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} else { |
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grpc_error* parse_error = GRPC_ERROR_NONE; |
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child_policy = LoadBalancingPolicyRegistry::ParseLoadBalancingConfig( |
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it->second, &parse_error); |
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if (child_policy == nullptr) { |
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GPR_DEBUG_ASSERT(parse_error != GRPC_ERROR_NONE); |
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std::vector<grpc_error*> child_errors; |
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child_errors.push_back(parse_error); |
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error_list.push_back( |
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GRPC_ERROR_CREATE_FROM_VECTOR("field:childPolicy", &child_errors)); |
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} |
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} |
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// Cluster name.
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std::string cluster_name; |
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it = json.object_value().find("clusterName"); |
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if (it == json.object_value().end()) { |
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error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
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"field:clusterName error:required field missing")); |
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} else if (it->second.type() != Json::Type::STRING) { |
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error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
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"field:clusterName error:type should be string")); |
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} else { |
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cluster_name = it->second.string_value(); |
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} |
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// EDS service name.
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std::string eds_service_name; |
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it = json.object_value().find("edsServiceName"); |
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if (it != json.object_value().end()) { |
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if (it->second.type() != Json::Type::STRING) { |
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error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
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"field:edsServiceName error:type should be string")); |
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} else { |
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eds_service_name = it->second.string_value(); |
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} |
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} |
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// LRS load reporting server name.
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absl::optional<std::string> lrs_load_reporting_server_name; |
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it = json.object_value().find("lrsLoadReportingServerName"); |
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if (it != json.object_value().end()) { |
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if (it->second.type() != Json::Type::STRING) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"field:lrsLoadReportingServerName error:type should be string")); |
||||
} else { |
||||
lrs_load_reporting_server_name = it->second.string_value(); |
||||
} |
||||
} |
||||
// Drop config.
|
||||
auto drop_config = MakeRefCounted<XdsApi::EdsUpdate::DropConfig>(); |
||||
it = json.object_value().find("dropCategories"); |
||||
if (it == json.object_value().end()) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"field:dropCategories error:required field missing")); |
||||
} else { |
||||
std::vector<grpc_error*> child_errors = |
||||
ParseDropCategories(it->second, drop_config.get()); |
||||
if (!child_errors.empty()) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_VECTOR( |
||||
"field:dropCategories", &child_errors)); |
||||
} |
||||
} |
||||
if (!error_list.empty()) { |
||||
*error = GRPC_ERROR_CREATE_FROM_VECTOR( |
||||
"eds_drop_experimental LB policy config", &error_list); |
||||
return nullptr; |
||||
} |
||||
return MakeRefCounted<EdsDropLbConfig>( |
||||
std::move(child_policy), std::move(cluster_name), |
||||
std::move(eds_service_name), std::move(lrs_load_reporting_server_name), |
||||
std::move(drop_config)); |
||||
} |
||||
|
||||
private: |
||||
static std::vector<grpc_error*> ParseDropCategories( |
||||
const Json& json, XdsApi::EdsUpdate::DropConfig* drop_config) { |
||||
std::vector<grpc_error*> error_list; |
||||
if (json.type() != Json::Type::ARRAY) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"dropCategories field is not an array")); |
||||
return error_list; |
||||
} |
||||
for (size_t i = 0; i < json.array_value().size(); ++i) { |
||||
const Json& entry = json.array_value()[i]; |
||||
std::vector<grpc_error*> child_errors = |
||||
ParseDropCategory(entry, drop_config); |
||||
if (!child_errors.empty()) { |
||||
grpc_error* error = GRPC_ERROR_CREATE_FROM_COPIED_STRING( |
||||
absl::StrCat("errors parsing index ", i).c_str()); |
||||
for (size_t i = 0; i < child_errors.size(); ++i) { |
||||
error = grpc_error_add_child(error, child_errors[i]); |
||||
} |
||||
error_list.push_back(error); |
||||
} |
||||
} |
||||
return error_list; |
||||
} |
||||
|
||||
static std::vector<grpc_error*> ParseDropCategory( |
||||
const Json& json, XdsApi::EdsUpdate::DropConfig* drop_config) { |
||||
std::vector<grpc_error*> error_list; |
||||
if (json.type() != Json::Type::OBJECT) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"dropCategories entry is not an object")); |
||||
return error_list; |
||||
} |
||||
std::string category; |
||||
auto it = json.object_value().find("category"); |
||||
if (it == json.object_value().end()) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"\"category\" field not present")); |
||||
} else if (it->second.type() != Json::Type::STRING) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"\"category\" field is not a string")); |
||||
} else { |
||||
category = it->second.string_value(); |
||||
} |
||||
uint32_t requests_per_million = 0; |
||||
it = json.object_value().find("requests_per_million"); |
||||
if (it == json.object_value().end()) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"\"requests_per_million\" field is not present")); |
||||
} else if (it->second.type() != Json::Type::NUMBER) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"\"requests_per_million\" field is not a number")); |
||||
} else { |
||||
requests_per_million = |
||||
gpr_parse_nonnegative_int(it->second.string_value().c_str()); |
||||
} |
||||
if (error_list.empty()) { |
||||
drop_config->AddCategory(std::move(category), requests_per_million); |
||||
} |
||||
return error_list; |
||||
} |
||||
}; |
||||
|
||||
} // namespace
|
||||
|
||||
} // namespace grpc_core
|
||||
|
||||
//
|
||||
// Plugin registration
|
||||
//
|
||||
|
||||
void grpc_lb_policy_eds_drop_init() { |
||||
grpc_core::LoadBalancingPolicyRegistry::Builder:: |
||||
RegisterLoadBalancingPolicyFactory( |
||||
absl::make_unique<grpc_core::EdsDropLbFactory>()); |
||||
} |
||||
|
||||
void grpc_lb_policy_eds_drop_shutdown() {} |
||||
Loading…
Reference in new issue