mirror of https://github.com/grpc/grpc.git
Mark D. Roth
4 years ago
parent
24f54fbb4b
commit
799e805e8a
20 changed files with 160 additions and 611 deletions
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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 <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/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_lb_lrs_trace(false, "lrs_lb"); |
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namespace { |
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constexpr char kLrs[] = "lrs_experimental"; |
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// Config for LRS LB policy.
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class LrsLbConfig : public LoadBalancingPolicy::Config { |
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public: |
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LrsLbConfig(RefCountedPtr<LoadBalancingPolicy::Config> child_policy, |
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std::string cluster_name, std::string eds_service_name, |
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std::string lrs_load_reporting_server_name, |
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RefCountedPtr<XdsLocalityName> locality_name) |
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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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locality_name_(std::move(locality_name)) {} |
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const char* name() const override { return kLrs; } |
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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 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<XdsLocalityName> locality_name() const { |
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return locality_name_; |
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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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std::string lrs_load_reporting_server_name_; |
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RefCountedPtr<XdsLocalityName> locality_name_; |
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}; |
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// LRS LB policy.
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class LrsLb : public LoadBalancingPolicy { |
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public: |
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LrsLb(RefCountedPtr<XdsClient> xds_client, Args args); |
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const char* name() const override { return kLrs; } |
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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 load reporting.
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class LoadReportingPicker : public SubchannelPicker { |
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public: |
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LoadReportingPicker(RefCountedPtr<RefCountedPicker> picker, |
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RefCountedPtr<XdsClusterLocalityStats> locality_stats) |
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: picker_(std::move(picker)), |
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locality_stats_(std::move(locality_stats)) {} |
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PickResult Pick(PickArgs args); |
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private: |
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RefCountedPtr<RefCountedPicker> picker_; |
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RefCountedPtr<XdsClusterLocalityStats> locality_stats_; |
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}; |
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class Helper : public ChannelControlHelper { |
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public: |
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explicit Helper(RefCountedPtr<LrsLb> lrs_policy) |
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: lrs_policy_(std::move(lrs_policy)) {} |
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~Helper() { lrs_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<LrsLb> lrs_policy_; |
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}; |
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~LrsLb(); |
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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<LrsLbConfig> 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<XdsClusterLocalityStats> locality_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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// LrsLb::LoadReportingPicker
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//
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LoadBalancingPolicy::PickResult LrsLb::LoadReportingPicker::Pick( |
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LoadBalancingPolicy::PickArgs args) { |
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// Forward the pick to the picker returned from the child policy.
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PickResult result = picker_->Pick(args); |
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if (result.type == PickResult::PICK_COMPLETE && |
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result.subchannel != nullptr) { |
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// Record a call started.
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locality_stats_->AddCallStarted(); |
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// Intercept the recv_trailing_metadata op to record call completion.
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XdsClusterLocalityStats* locality_stats = |
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locality_stats_->Ref(DEBUG_LOCATION, "LocalityStats+call").release(); |
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result.recv_trailing_metadata_ready = |
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// Note: This callback does not run in either the control plane
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// work serializer or in the data plane mutex.
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[locality_stats](grpc_error* error, MetadataInterface* /*metadata*/, |
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CallState* /*call_state*/) { |
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const bool call_failed = error != GRPC_ERROR_NONE; |
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locality_stats->AddCallFinished(call_failed); |
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locality_stats->Unref(DEBUG_LOCATION, "LocalityStats+call"); |
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}; |
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} |
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return result; |
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} |
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//
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// LrsLb
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//
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LrsLb::LrsLb(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_lb_lrs_trace)) { |
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gpr_log(GPR_INFO, "[lrs_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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LrsLb::~LrsLb() { |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_lb_lrs_trace)) { |
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gpr_log(GPR_INFO, "[lrs_lb %p] destroying xds LB policy", this); |
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} |
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} |
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void LrsLb::ShutdownLocked() { |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_lb_lrs_trace)) { |
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gpr_log(GPR_INFO, "[lrs_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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locality_stats_.reset(); |
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xds_client_.reset(); |
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} |
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void LrsLb::ExitIdleLocked() { |
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if (child_policy_ != nullptr) child_policy_->ExitIdleLocked(); |
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} |
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void LrsLb::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 LrsLb::UpdateLocked(UpdateArgs args) { |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_lb_lrs_trace)) { |
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gpr_log(GPR_INFO, "[lrs_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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*config_->locality_name() != *old_config->locality_name()) { |
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locality_stats_ = xds_client_->AddClusterLocalityStats( |
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config_->lrs_load_reporting_server_name(), config_->cluster_name(), |
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config_->eds_service_name(), config_->locality_name()); |
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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 LrsLb::MaybeUpdatePickerLocked() { |
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if (picker_ != nullptr) { |
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auto lrs_picker = |
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absl::make_unique<LoadReportingPicker>(picker_, locality_stats_); |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_lb_lrs_trace)) { |
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gpr_log( |
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GPR_INFO, |
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"[lrs_lb %p] updating connectivity: state=%s status=(%s) picker=%p", |
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this, ConnectivityStateName(state_), status_.ToString().c_str(), |
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lrs_picker.get()); |
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} |
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channel_control_helper()->UpdateState(state_, status_, |
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std::move(lrs_picker)); |
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} |
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} |
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OrphanablePtr<LoadBalancingPolicy> LrsLb::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_lb_lrs_trace); |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_lb_lrs_trace)) { |
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gpr_log(GPR_INFO, "[lrs_lb %p] Created new child policy handler %p", this, |
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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 LrsLb::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_lb_lrs_trace)) { |
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gpr_log(GPR_INFO, "[lrs_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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// LrsLb::Helper
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//
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RefCountedPtr<SubchannelInterface> LrsLb::Helper::CreateSubchannel( |
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ServerAddress address, const grpc_channel_args& args) { |
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if (lrs_policy_->shutting_down_) return nullptr; |
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return lrs_policy_->channel_control_helper()->CreateSubchannel( |
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std::move(address), args); |
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} |
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void LrsLb::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 (lrs_policy_->shutting_down_) return; |
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if (GRPC_TRACE_FLAG_ENABLED(grpc_lb_lrs_trace)) { |
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gpr_log( |
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GPR_INFO, |
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"[lrs_lb %p] child connectivity state update: state=%s (%s) picker=%p", |
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lrs_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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lrs_policy_->state_ = state; |
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lrs_policy_->status_ = status; |
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lrs_policy_->picker_ = MakeRefCounted<RefCountedPicker>(std::move(picker)); |
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// Wrap the picker and return it to the channel.
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lrs_policy_->MaybeUpdatePickerLocked(); |
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} |
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void LrsLb::Helper::RequestReresolution() { |
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if (lrs_policy_->shutting_down_) return; |
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lrs_policy_->channel_control_helper()->RequestReresolution(); |
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} |
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void LrsLb::Helper::AddTraceEvent(TraceSeverity severity, |
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absl::string_view message) { |
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if (lrs_policy_->shutting_down_) return; |
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lrs_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 LrsLbFactory : 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 lrs 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<LrsLb>(std::move(xds_client), std::move(args)); |
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} |
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const char* name() const override { return kLrs; } |
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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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// lrs was mentioned as a policy 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:lrs policy requires configuration. " |
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"Please use loadBalancingConfig field of service 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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// Locality.
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RefCountedPtr<XdsLocalityName> locality_name; |
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it = json.object_value().find("locality"); |
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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:locality error:required field missing")); |
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} else { |
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std::vector<grpc_error*> child_errors = |
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ParseLocality(it->second, &locality_name); |
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if (!child_errors.empty()) { |
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error_list.push_back( |
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GRPC_ERROR_CREATE_FROM_VECTOR("field:locality", &child_errors)); |
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} |
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} |
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// LRS load reporting server name.
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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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error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
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"field:lrsLoadReportingServerName 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:lrsLoadReportingServerName error:type should be string")); |
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} else { |
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lrs_load_reporting_server_name = it->second.string_value(); |
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} |
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if (!error_list.empty()) { |
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*error = GRPC_ERROR_CREATE_FROM_VECTOR( |
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"lrs_experimental LB policy config", &error_list); |
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return nullptr; |
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} |
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return MakeRefCounted<LrsLbConfig>( |
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std::move(child_policy), std::move(cluster_name), |
||||
std::move(eds_service_name), std::move(lrs_load_reporting_server_name), |
||||
std::move(locality_name)); |
||||
} |
||||
|
||||
private: |
||||
static std::vector<grpc_error*> ParseLocality( |
||||
const Json& json, RefCountedPtr<XdsLocalityName>* name) { |
||||
std::vector<grpc_error*> error_list; |
||||
if (json.type() != Json::Type::OBJECT) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"locality field is not an object")); |
||||
return error_list; |
||||
} |
||||
std::string region; |
||||
auto it = json.object_value().find("region"); |
||||
if (it != json.object_value().end()) { |
||||
if (it->second.type() != Json::Type::STRING) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"\"region\" field is not a string")); |
||||
} else { |
||||
region = it->second.string_value(); |
||||
} |
||||
} |
||||
std::string zone; |
||||
it = json.object_value().find("zone"); |
||||
if (it != json.object_value().end()) { |
||||
if (it->second.type() != Json::Type::STRING) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"\"zone\" field is not a string")); |
||||
} else { |
||||
zone = it->second.string_value(); |
||||
} |
||||
} |
||||
std::string subzone; |
||||
it = json.object_value().find("subzone"); |
||||
if (it != json.object_value().end()) { |
||||
if (it->second.type() != Json::Type::STRING) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"\"subzone\" field is not a string")); |
||||
} else { |
||||
subzone = it->second.string_value(); |
||||
} |
||||
} |
||||
if (region.empty() && zone.empty() && subzone.empty()) { |
||||
error_list.push_back(GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
||||
"at least one of region, zone, or subzone must be set")); |
||||
} |
||||
if (error_list.empty()) { |
||||
*name = MakeRefCounted<XdsLocalityName>(region, zone, subzone); |
||||
} |
||||
return error_list; |
||||
} |
||||
}; |
||||
|
||||
} // namespace
|
||||
|
||||
} // namespace grpc_core
|
||||
|
||||
//
|
||||
// Plugin registration
|
||||
//
|
||||
|
||||
void grpc_lb_policy_lrs_init() { |
||||
grpc_core::LoadBalancingPolicyRegistry::Builder:: |
||||
RegisterLoadBalancingPolicyFactory( |
||||
absl::make_unique<grpc_core::LrsLbFactory>()); |
||||
} |
||||
|
||||
void grpc_lb_policy_lrs_shutdown() {} |
||||
Loading…
Reference in new issue