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281 lines (247 loc) · 9.78 KB
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#include "intertwine/fw/IdUtil.hpp"
#include "intertwine/fw/Logger.hpp"
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/uuid/uuid_io.hpp>
#include <boost/thread/tss.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>
#include <boost/chrono.hpp>
#include <sstream>
#include <stdexcept>
#include <cstring>
#include <cstdlib>
#include <vector>
#ifdef _WIN32
#include <winsock2.h>
#include <iphlpapi.h>
#pragma comment(lib, "iphlpapi.lib")
#else
#include <sys/ioctl.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <unistd.h>
#include <netpacket/packet.h>
#endif
namespace intertwine {
namespace fw {
SnowflakeGenerator::SnowflakeGenerator(int64_t datacenterId, int64_t workerId)
: m_datacenterId(datacenterId)
, m_workerId(workerId)
, m_sequence(0)
, m_lastTimestamp(-1)
{
if (datacenterId > MAX_DATACENTER_ID || datacenterId < 0) {
throw std::invalid_argument("datacenterId must be between 0 and 31");
}
if (workerId > MAX_WORKER_ID || workerId < 0) {
throw std::invalid_argument("workerId must be between 0 and 31");
}
}
int64_t SnowflakeGenerator::currentTimeMillis() {
// 获取最新的系统时间戳（毫秒）
boost::chrono::milliseconds ms = boost::chrono::duration_cast<boost::chrono::milliseconds>(boost::chrono::system_clock::now().time_since_epoch());
return ms.count();
}
int64_t SnowflakeGenerator::nextId() {
int64_t timestamp = currentTimeMillis();
if (timestamp == m_lastTimestamp) {
// 同一毫秒内，序列号递增
m_sequence = (m_sequence + 1) & MAX_SEQUENCE;
if (m_sequence == 0) {
// 序列号溢出，等待下一毫秒
// 加上最大等待次数，防止时钟回拨时死循环
int waitCount = 0;
const int MAX_WAIT_COUNT = 5; // 最多等待5次（约5ms）
while (timestamp <= m_lastTimestamp && waitCount < MAX_WAIT_COUNT) {
timestamp = currentTimeMillis();
++waitCount;
// 检测时钟回拨
if (timestamp < m_lastTimestamp) {
LOG_ERROR("Snowflake clock moved backwards: last=" + std::to_string(m_lastTimestamp)
+ "ms, current=" + std::to_string(timestamp) + "ms");
return 0;
}
}
// 等待超时
if (timestamp <= m_lastTimestamp) {
LOG_ERROR("Snowflake sequence overflow timeout after " + std::to_string(MAX_WAIT_COUNT) + " attempts");
return 0;
}
}
} else {
// 不同毫秒，序列号重置
m_sequence = 0;
}
m_lastTimestamp = timestamp;
// 组装ID
return ((timestamp - EPOCH) << TIMESTAMP_SHIFT)
| (m_datacenterId << DATACENTER_ID_SHIFT)
| (m_workerId << WORKER_ID_SHIFT)
| m_sequence;
}
std::string SnowflakeGenerator::nextIdStr() {
std::ostringstream oss;
oss << nextId();
return oss.str();
}
// ============================================================================
// IdUtil 实现
// ============================================================================
// ============================================================================
// 辅助函数：获取本机 MAC 地址
// ============================================================================
namespace {
/**
* 获取主机名+MAC地址混合哈希值（用于计算数据中心ID）
* @return 混合哈希值
*/
int64_t getHostMacHash() {
// 1. 获取主机名
char hostname[256] = {0};
gethostname(hostname, sizeof(hostname));
// 2. 获取MAC地址
unsigned char macAddr[6] = {0};
bool macFound = false;
#ifdef _WIN32
{
ULONG bufLen = 16 * 1024;
std::vector<unsigned char> buf(bufLen);
ULONG flags = GAA_FLAG_SKIP_ANYCAST | GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_DNS_SERVER;
DWORD ret = GetAdaptersAddresses(AF_UNSPEC, flags, nullptr,
reinterpret_cast<IP_ADAPTER_ADDRESSES*>(buf.data()),
&bufLen);
if (ret == ERROR_BUFFER_OVERFLOW) {
buf.resize(bufLen);
ret = GetAdaptersAddresses(AF_UNSPEC, flags, nullptr,
reinterpret_cast<IP_ADAPTER_ADDRESSES*>(buf.data()),
&bufLen);
}
if (ret == NO_ERROR) {
for (IP_ADAPTER_ADDRESSES* a = reinterpret_cast<IP_ADAPTER_ADDRESSES*>(buf.data());
a != nullptr; a = a->Next) {
if (a->IfType == IF_TYPE_SOFTWARE_LOOPBACK) continue;
if (a->PhysicalAddressLength != 6) continue;
bool allZero = true;
for (int i = 0; i < 6; ++i) {
if (a->PhysicalAddress[i] != 0) { allZero = false; break; }
}
if (allZero) continue;
memcpy(macAddr, a->PhysicalAddress, 6);
macFound = true;
break;
}
}
}
#else
struct ifaddrs* ifap = nullptr;
struct ifaddrs* ifa = nullptr;
if (getifaddrs(&ifap) == 0) {
for (ifa = ifap; ifa != nullptr; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == nullptr) {
continue;
}
// 查找 AF_PACKET 类型的接口（包含MAC地址）
if (ifa->ifa_addr->sa_family == AF_PACKET) {
struct sockaddr_ll* s = (struct sockaddr_ll*)(ifa->ifa_addr);
// 跳过回环接口
if (strcmp(ifa->ifa_name, "lo") == 0) {
continue;
}
// 检查是否有有效的 MAC 地址（不全为0）
bool allZero = true;
for (int i = 0; i < 6; ++i) {
if (s->sll_addr[i] != 0) {
allZero = false;
break;
}
}
if (!allZero && s->sll_halen == 6) {
memcpy(macAddr, s->sll_addr, 6);
macFound = true;
break;
}
}
}
freeifaddrs(ifap);
}
#endif
// 3. 计算混合哈希：主机名 + MAC 地址
size_t hash = 0;
// 主机名部分
for (size_t i = 0; hostname[i] != '\0' && i < sizeof(hostname); ++i) {
hash = hash * 31 + static_cast<size_t>(hostname[i]);
}
// MAC 地址部分
if (macFound) {
for (int i = 0; i < 6; ++i) {
hash = hash * 256 + static_cast<size_t>(macAddr[i]);
}
}
return static_cast<int64_t>(hash);
}
} // namespace
// UUID 生成器（线程本地存储）
std::string IdUtil::generateV4() {
static boost::thread_specific_ptr<boost::uuids::random_generator> generator;
if (!generator.get()) {
generator.reset(new boost::uuids::random_generator());
}
return boost::uuids::to_string((*generator)());
}
std::string IdUtil::generateTimedV4() {
int64_t us = boost::chrono::duration_cast<boost::chrono::microseconds>(
boost::chrono::system_clock::now().time_since_epoch()).count();
std::ostringstream oss;
oss << us << "-" << generateV4();
return oss.str();
}
// 雪花算法全局配置
static int64_t s_customDatacenterId = -1; // 自定义数据中心ID（-1表示未设置，使用MAC地址）
static int64_t s_customWorkerId = -1; // 自定义机器ID（-1表示未设置，使用线程ID）
static boost::mutex s_snowflakeMutex;
void IdUtil::initSnowflake(int64_t datacenterId, int64_t workerId) {
boost::lock_guard<boost::mutex> lock(s_snowflakeMutex);
s_customDatacenterId = datacenterId;
s_customWorkerId = workerId;
}
// 雪花算法生成器（线程本地存储）
static boost::thread_specific_ptr<SnowflakeGenerator> s_snowflakeGenerator;
int64_t IdUtil::generateSnowflakeId() {
if (!s_snowflakeGenerator.get()) {
boost::lock_guard<boost::mutex> lock(s_snowflakeMutex);
// 1. 计算数据中心ID（使用自定义值或主机名+MAC混合）
int64_t datacenterId;
if (s_customDatacenterId >= 0) {
datacenterId = s_customDatacenterId % 32;
} else {
// 从主机名+MAC地址混合计算数据中心ID
datacenterId = getHostMacHash() % 32;
}
// 2. 计算机器ID（使用自定义值或线程ID）
int64_t workerId;
if (s_customWorkerId >= 0) {
workerId = s_customWorkerId % 32;
} else {
// 从线程 ID 计算机器ID
boost::thread::id tid = boost::this_thread::get_id();
std::ostringstream oss;
oss << tid;
std::string tidStr = oss.str();
size_t hash = 0;
for (size_t i = 0; i < tidStr.length(); ++i) {
hash = hash * 31 + static_cast<size_t>(tidStr[i]);
}
workerId = static_cast<int64_t>(hash % 32);
}
s_snowflakeGenerator.reset(new SnowflakeGenerator(datacenterId, workerId));
}
return s_snowflakeGenerator->nextId();
}
std::string IdUtil::generateSnowflakeIdStr() {
std::ostringstream oss;
oss << generateSnowflakeId();
return oss.str();
}
} // namespace fw
} // namespace intertwine