File size: 6,383 Bytes
5412a90 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | #pragma once
#ifdef EUNEX_USE_KAFKA
#include "persistence/PersistenceStore.hpp"
#include <librdkafka/rdkafkacpp.h>
#include <string>
#include <memory>
#include <mutex>
#include <atomic>
#include <iostream>
namespace eunex::persistence {
struct KafkaConfig {
std::string brokers = "localhost:9092";
std::string topic = "eunex.recovery.fragments";
std::string groupId = "eunex-recovery";
int flushTimeoutMs = 5000;
int batchSize = 100;
};
// ── Kafka-backed persistence store ─────────────────────────────────
class KafkaStore : public PersistenceStore {
public:
explicit KafkaStore(const KafkaConfig& cfg) : config_(cfg) {
initProducer();
initConsumer();
}
~KafkaStore() override {
if (producer_) producer_->flush(config_.flushTimeoutMs);
}
void append(const Fragment& frag) override {
if (!producer_ || !topic_) return;
std::vector<uint8_t> buf = serialize(frag);
std::string key = std::to_string(frag.originId) + ":" +
std::to_string(frag.originKey);
RdKafka::ErrorCode err = producer_->produce(
topic_.get(), RdKafka::Topic::PARTITION_UA,
RdKafka::Producer::RK_MSG_COPY,
buf.data(), buf.size(),
key.data(), key.size(),
0, nullptr);
if (err != RdKafka::ERR_NO_ERROR) {
std::cerr << "[KafkaStore] produce failed: "
<< RdKafka::err2str(err) << "\n";
}
producer_->poll(0);
count_.fetch_add(1);
}
std::vector<Fragment> readAll() const override {
if (!consumer_) return {};
std::vector<Fragment> result;
while (true) {
auto msg = std::unique_ptr<RdKafka::Message>(
consumer_->consume(1000));
if (!msg || msg->err() == RdKafka::ERR__TIMED_OUT ||
msg->err() == RdKafka::ERR__PARTITION_EOF) {
break;
}
if (msg->err() != RdKafka::ERR_NO_ERROR) break;
Fragment frag = deserialize(
static_cast<const uint8_t*>(msg->payload()),
msg->len());
result.push_back(frag);
}
return result;
}
size_t size() const override {
return count_.load();
}
void flush() override {
if (producer_) producer_->flush(config_.flushTimeoutMs);
}
bool isConnected() const { return producer_ != nullptr; }
private:
KafkaConfig config_;
std::unique_ptr<RdKafka::Producer> producer_;
std::unique_ptr<RdKafka::Topic> topic_;
mutable std::unique_ptr<RdKafka::KafkaConsumer> consumer_;
std::atomic<size_t> count_{0};
void initProducer() {
std::string errstr;
auto conf = std::unique_ptr<RdKafka::Conf>(
RdKafka::Conf::create(RdKafka::Conf::CONF_GLOBAL));
conf->set("bootstrap.servers", config_.brokers, errstr);
conf->set("queue.buffering.max.messages", "100000", errstr);
conf->set("batch.size", std::to_string(config_.batchSize), errstr);
producer_.reset(RdKafka::Producer::create(conf.get(), errstr));
if (!producer_) {
std::cerr << "[KafkaStore] producer creation failed: " << errstr << "\n";
return;
}
auto tconf = std::unique_ptr<RdKafka::Conf>(
RdKafka::Conf::create(RdKafka::Conf::CONF_TOPIC));
topic_.reset(RdKafka::Topic::create(producer_.get(), config_.topic,
tconf.get(), errstr));
}
void initConsumer() {
std::string errstr;
auto conf = std::unique_ptr<RdKafka::Conf>(
RdKafka::Conf::create(RdKafka::Conf::CONF_GLOBAL));
conf->set("bootstrap.servers", config_.brokers, errstr);
conf->set("group.id", config_.groupId, errstr);
conf->set("auto.offset.reset", "earliest", errstr);
conf->set("enable.auto.commit", "false", errstr);
consumer_.reset(RdKafka::KafkaConsumer::create(conf.get(), errstr));
if (consumer_) {
consumer_->subscribe({config_.topic});
}
}
static std::vector<uint8_t> serialize(const Fragment& frag) {
// Header: fixed fields, then payload
size_t headerSize = sizeof(uint64_t) * 2 + sizeof(uint16_t) +
sizeof(uint32_t) + sizeof(uint8_t) +
sizeof(int) + sizeof(size_t);
std::vector<uint8_t> buf(headerSize + frag.payloadSize);
uint8_t* p = buf.data();
std::memcpy(p, &frag.sequenceNumber, sizeof(uint64_t)); p += sizeof(uint64_t);
std::memcpy(p, &frag.chainId, sizeof(uint64_t)); p += sizeof(uint64_t);
std::memcpy(p, &frag.originId, sizeof(uint16_t)); p += sizeof(uint16_t);
std::memcpy(p, &frag.originKey, sizeof(uint32_t)); p += sizeof(uint32_t);
std::memcpy(p, &frag.persistenceId, sizeof(uint8_t)); p += sizeof(uint8_t);
std::memcpy(p, &frag.nextCount, sizeof(int)); p += sizeof(int);
std::memcpy(p, &frag.payloadSize, sizeof(size_t)); p += sizeof(size_t);
std::memcpy(p, frag.payload, frag.payloadSize);
return buf;
}
static Fragment deserialize(const uint8_t* data, size_t len) {
Fragment frag{};
const uint8_t* p = data;
std::memcpy(&frag.sequenceNumber, p, sizeof(uint64_t)); p += sizeof(uint64_t);
std::memcpy(&frag.chainId, p, sizeof(uint64_t)); p += sizeof(uint64_t);
std::memcpy(&frag.originId, p, sizeof(uint16_t)); p += sizeof(uint16_t);
std::memcpy(&frag.originKey, p, sizeof(uint32_t)); p += sizeof(uint32_t);
std::memcpy(&frag.persistenceId, p, sizeof(uint8_t)); p += sizeof(uint8_t);
std::memcpy(&frag.nextCount, p, sizeof(int)); p += sizeof(int);
std::memcpy(&frag.payloadSize, p, sizeof(size_t)); p += sizeof(size_t);
size_t remaining = len - static_cast<size_t>(p - data);
size_t copySize = std::min(frag.payloadSize, remaining);
copySize = std::min(copySize, sizeof(frag.payload));
std::memcpy(frag.payload, p, copySize);
return frag;
}
};
} // namespace eunex::persistence
#endif // EUNEX_USE_KAFKA
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