xds_endpoint.h

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//
// Copyright 2018 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
 
#ifndef GRPC_CORE_EXT_XDS_XDS_ENDPOINT_H
#define GRPC_CORE_EXT_XDS_XDS_ENDPOINT_H
 
#include <grpc/support/port_platform.h>
 
#include <stdint.h>
 
#include <algorithm>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
 
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "envoy/config/endpoint/v3/endpoint.upbdefs.h"
#include "upb/def.h"
 
#include "src/core/ext/xds/upb_utils.h"
#include "src/core/ext/xds/xds_client_stats.h"
#include "src/core/ext/xds/xds_resource_type_impl.h"
#include "src/core/lib/gprpp/ref_counted.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
#include "src/core/lib/resolver/server_address.h"
 
namespace grpc_core {
 
struct XdsEndpointResource {
  struct Priority {
    struct Locality {
      RefCountedPtr<XdsLocalityName> name;
      uint32_t lb_weight;
      ServerAddressList endpoints;
 
      bool operator==(const Locality& other) const {
        return *name == *other.name && lb_weight == other.lb_weight &&
               endpoints == other.endpoints;
      }
      bool operator!=(const Locality& other) const { return !(*this == other); }
      std::string ToString() const;
    };
 
    std::map<XdsLocalityName*, Locality, XdsLocalityName::Less> localities;
 
    bool operator==(const Priority& other) const;
    std::string ToString() const;
  };
  using PriorityList = std::vector<Priority>;
 
  // There are two phases of accessing this class's content:
  // 1. to initialize in the control plane combiner;
  // 2. to use in the data plane combiner.
  // So no additional synchronization is needed.
  class DropConfig : public RefCounted<DropConfig> {
   public:
    struct DropCategory {
      bool operator==(const DropCategory& other) const {
        return name == other.name &&
               parts_per_million == other.parts_per_million;
      }
 
      std::string name;
      const uint32_t parts_per_million;
    };
 
    using DropCategoryList = std::vector<DropCategory>;
 
    void AddCategory(std::string name, uint32_t parts_per_million) {
      drop_category_list_.emplace_back(
          DropCategory{std::move(name), parts_per_million});
      if (parts_per_million == 1000000) drop_all_ = true;
    }
 
    // The only method invoked from outside the WorkSerializer (used in
    // the data plane).
    bool ShouldDrop(const std::string** category_name) const;
 
    const DropCategoryList& drop_category_list() const {
      return drop_category_list_;
    }
 
    bool drop_all() const { return drop_all_; }
 
    bool operator==(const DropConfig& other) const {
      return drop_category_list_ == other.drop_category_list_;
    }
    bool operator!=(const DropConfig& other) const { return !(*this == other); }
 
    std::string ToString() const;
 
   private:
    DropCategoryList drop_category_list_;
    bool drop_all_ = false;
  };
 
  PriorityList priorities;
  RefCountedPtr<DropConfig> drop_config;
 
  bool operator==(const XdsEndpointResource& other) const {
    return priorities == other.priorities && *drop_config == *other.drop_config;
  }
  std::string ToString() const;
};
 
class XdsEndpointResourceType
    : public XdsResourceTypeImpl<XdsEndpointResourceType, XdsEndpointResource> {
 public:
  absl::string_view type_url() const override {
    return "envoy.config.endpoint.v3.ClusterLoadAssignment";
  }
  absl::string_view v2_type_url() const override {
    return "envoy.api.v2.ClusterLoadAssignment";
  }
 
  absl::StatusOr<DecodeResult> Decode(const XdsEncodingContext& context,
                                      absl::string_view serialized_resource,
                                      bool is_v2) const override;
 
  void InitUpbSymtab(upb_DefPool* symtab) const override {
    envoy_config_endpoint_v3_ClusterLoadAssignment_getmsgdef(symtab);
  }
};
 
}  // namespace grpc_core
 
#endif  // GRPC_CORE_EXT_XDS_XDS_ENDPOINT_H