325 lines
11 KiB
PHP
325 lines
11 KiB
PHP
<?php
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namespace App\Services\Ticket;
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use App\Models\RiskPool;
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use App\Lottery\ErrorCode;
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use App\Models\TicketItem;
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use App\Models\RiskPoolLockLog;
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use Illuminate\Support\Facades\App;
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use Illuminate\Support\Facades\Redis;
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use App\Exceptions\TicketOperationException;
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final class RiskPoolService
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{
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public function __construct(
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private readonly PlayCatalogResolver $catalogResolver,
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) {}
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/**
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* @param list<array{number_4d:string, amount:int}> $locks
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* @return list<array{number_4d:string, amount:int, warning:bool}>
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*/
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public function preview(int $drawId, array $locks): array
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{
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$rows = [];
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foreach ($locks as $lock) {
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$pool = $this->firstOrMakePool($drawId, $lock['number_4d']);
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$remaining = (int) $pool->remaining_amount;
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if ($remaining < (int) $lock['amount']) {
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throw new TicketOperationException('risk_sold_out', ErrorCode::RiskPoolSoldOut->value);
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}
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$usage = (int) $pool->total_cap_amount > 0
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? ((int) $pool->locked_amount + (int) $lock['amount']) / (int) $pool->total_cap_amount
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: 1;
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$rows[] = [
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'number_4d' => $lock['number_4d'],
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'amount' => (int) $lock['amount'],
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'warning' => $usage >= 0.8,
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];
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}
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return $rows;
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}
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/**
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* @param list<array{number_4d:string, amount:int}> $locks
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*/
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public function acquire(int $drawId, ?TicketItem $ticketItem, array $locks): int
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{
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if ($this->shouldUseRedisAtomicLocks()) {
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return $this->acquireWithRedisLua($drawId, $ticketItem, $locks);
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}
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return $this->acquireWithDatabaseLocks($drawId, $ticketItem, $locks);
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}
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/**
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* @param list<array{number_4d:string, amount:int}> $locks
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*/
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private function acquireWithDatabaseLocks(int $drawId, ?TicketItem $ticketItem, array $locks): int
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{
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$acquired = [];
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$total = 0;
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try {
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foreach ($locks as $lock) {
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$pool = RiskPool::query()
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->where('draw_id', $drawId)
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->where('normalized_number', $lock['number_4d'])
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->lockForUpdate()
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->first();
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if ($pool === null) {
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$pool = $this->createPool($drawId, $lock['number_4d']);
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$pool = RiskPool::query()
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->where('draw_id', $drawId)
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->where('normalized_number', $lock['number_4d'])
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->lockForUpdate()
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->firstOrFail();
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}
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$amount = (int) $lock['amount'];
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if ((int) $pool->remaining_amount < $amount) {
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throw new TicketOperationException('risk_sold_out', ErrorCode::RiskPoolSoldOut->value);
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}
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$pool->forceFill([
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'locked_amount' => (int) $pool->locked_amount + $amount,
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'remaining_amount' => (int) $pool->remaining_amount - $amount,
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'sold_out_status' => ((int) $pool->remaining_amount - $amount) <= 0 ? 1 : 0,
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'version' => (int) $pool->version + 1,
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])->save();
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RiskPoolLockLog::query()->create([
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'draw_id' => $drawId,
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'normalized_number' => $lock['number_4d'],
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'ticket_item_id' => $ticketItem?->id,
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'action_type' => 'lock',
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'amount' => $amount,
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'source_reason' => 'ticket_place',
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'created_at' => now(),
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]);
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$acquired[] = ['number_4d' => $lock['number_4d'], 'amount' => $amount];
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$total += $amount;
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}
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} catch (\Throwable $e) {
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$this->releaseDatabaseLocks($drawId, $ticketItem, $acquired, 'ticket_failed_line');
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throw $e;
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}
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return $total;
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}
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/**
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* Redis Lua 负责额度判断与扣减的原子性；数据库事实表随后同步，失败时释放 Redis 占用。
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*
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* @param list<array{number_4d:string, amount:int}> $locks
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*/
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private function acquireWithRedisLua(int $drawId, ?TicketItem $ticketItem, array $locks): int
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{
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$acquired = [];
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$total = 0;
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try {
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foreach ($locks as $lock) {
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$number4d = $lock['number_4d'];
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$amount = (int) $lock['amount'];
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$pool = $this->firstOrMakePool($drawId, $number4d);
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$key = $this->redisPoolKey($drawId, $number4d);
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Redis::eval($this->initLua(), 1, $key, (int) $pool->total_cap_amount, (int) $pool->locked_amount);
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$result = (int) Redis::eval($this->acquireLua(), 1, $key, $amount);
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if ($result !== 1) {
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throw new TicketOperationException('risk_sold_out', ErrorCode::RiskPoolSoldOut->value);
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}
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$acquired[] = ['number_4d' => $number4d, 'amount' => $amount];
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$total += $amount;
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$this->syncDatabaseAfterRedisAcquire($drawId, $ticketItem, $number4d, $amount);
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}
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} catch (\Throwable $e) {
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$this->releaseRedisLocks($drawId, $acquired);
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$this->releaseDatabaseLocks($drawId, $ticketItem, $acquired, 'ticket_failed_line');
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throw $e;
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}
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return $total;
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}
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/**
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* @param list<array{number_4d:string, amount:int}> $locks
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*/
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public function release(int $drawId, ?TicketItem $ticketItem, array $locks): void
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{
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if ($this->shouldUseRedisAtomicLocks()) {
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$this->releaseRedisLocks($drawId, $locks);
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}
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foreach ($locks as $lock) {
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$this->releaseDatabaseLocks($drawId, $ticketItem, [$lock], 'ticket_rollback');
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}
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}
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private function shouldUseRedisAtomicLocks(): bool
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{
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if (App::environment('testing')) {
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return false;
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}
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return (bool) config('lottery.risk_pool.use_redis_lua', true);
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}
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private function redisPoolKey(int $drawId, string $number4d): string
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{
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return "risk_pool:draw:{$drawId}:number:{$number4d}";
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}
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private function initLua(): string
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{
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return <<<'LUA'
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if redis.call('EXISTS', KEYS[1]) == 0 then
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redis.call('HMSET', KEYS[1], 'total', ARGV[1], 'locked', ARGV[2], 'remaining', ARGV[1] - ARGV[2])
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end
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return 1
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LUA;
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}
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private function acquireLua(): string
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{
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return <<<'LUA'
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local amount = tonumber(ARGV[1])
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local remaining = tonumber(redis.call('HGET', KEYS[1], 'remaining') or '0')
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if remaining < amount then
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return 0
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end
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redis.call('HINCRBY', KEYS[1], 'locked', amount)
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redis.call('HINCRBY', KEYS[1], 'remaining', -amount)
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return 1
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LUA;
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}
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private function releaseLua(): string
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{
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return <<<'LUA'
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local amount = tonumber(ARGV[1])
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local locked = tonumber(redis.call('HGET', KEYS[1], 'locked') or '0')
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local releaseAmount = amount
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if locked < releaseAmount then
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releaseAmount = locked
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end
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redis.call('HINCRBY', KEYS[1], 'locked', -releaseAmount)
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redis.call('HINCRBY', KEYS[1], 'remaining', releaseAmount)
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return releaseAmount
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LUA;
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}
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private function syncDatabaseAfterRedisAcquire(int $drawId, ?TicketItem $ticketItem, string $number4d, int $amount): void
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{
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$pool = RiskPool::query()
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->where('draw_id', $drawId)
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->where('normalized_number', $number4d)
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->lockForUpdate()
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->firstOrFail();
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$pool->forceFill([
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'locked_amount' => (int) $pool->locked_amount + $amount,
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'remaining_amount' => (int) $pool->remaining_amount - $amount,
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'sold_out_status' => ((int) $pool->remaining_amount - $amount) <= 0 ? 1 : 0,
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'version' => (int) $pool->version + 1,
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])->save();
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RiskPoolLockLog::query()->create([
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'draw_id' => $drawId,
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'normalized_number' => $number4d,
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'ticket_item_id' => $ticketItem?->id,
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'action_type' => 'lock',
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'amount' => $amount,
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'source_reason' => 'ticket_place',
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'created_at' => now(),
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]);
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}
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/**
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* @param list<array{number_4d:string, amount:int}> $locks
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*/
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private function releaseRedisLocks(int $drawId, array $locks): void
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{
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foreach ($locks as $lock) {
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Redis::eval($this->releaseLua(), 1, $this->redisPoolKey($drawId, $lock['number_4d']), (int) $lock['amount']);
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}
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}
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/**
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* @param list<array{number_4d:string, amount:int}> $locks
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*/
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private function releaseDatabaseLocks(int $drawId, ?TicketItem $ticketItem, array $locks, string $sourceReason): void
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{
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foreach ($locks as $lock) {
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$pool = RiskPool::query()
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->where('draw_id', $drawId)
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->where('normalized_number', $lock['number_4d'])
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->lockForUpdate()
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->first();
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if ($pool === null) {
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continue;
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}
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$amount = min((int) $lock['amount'], (int) $pool->locked_amount);
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$pool->forceFill([
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'locked_amount' => (int) $pool->locked_amount - $amount,
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'remaining_amount' => (int) $pool->remaining_amount + $amount,
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'sold_out_status' => 0,
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'version' => (int) $pool->version + 1,
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])->save();
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RiskPoolLockLog::query()->create([
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'draw_id' => $drawId,
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'normalized_number' => $lock['number_4d'],
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'ticket_item_id' => $ticketItem?->id,
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'action_type' => 'release',
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'amount' => $amount,
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'source_reason' => $sourceReason,
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'created_at' => now(),
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]);
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}
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}
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private function firstOrMakePool(int $drawId, string $number4d): RiskPool
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{
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return RiskPool::query()->firstOrCreate(
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['draw_id' => $drawId, 'normalized_number' => $number4d],
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[
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'total_cap_amount' => $this->catalogResolver->resolveCapAmount($drawId, $number4d),
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'locked_amount' => 0,
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'remaining_amount' => $this->catalogResolver->resolveCapAmount($drawId, $number4d),
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'sold_out_status' => 0,
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'version' => 0,
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],
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);
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}
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private function createPool(int $drawId, string $number4d): RiskPool
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{
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$cap = $this->catalogResolver->resolveCapAmount($drawId, $number4d);
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return RiskPool::query()->create([
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'draw_id' => $drawId,
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'normalized_number' => $number4d,
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'total_cap_amount' => $cap,
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'locked_amount' => 0,
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'remaining_amount' => $cap,
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'sold_out_status' => 0,
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'version' => 0,
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]);
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}
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}
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