78 lines
3.0 KiB
PHP
78 lines
3.0 KiB
PHP
<?php
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namespace App\Http\Controllers\Api\Images;
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use App\Http\Controllers\Controller;
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use Illuminate\Http\Request;
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use App\Models\Articles as ModelArticles;
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use Illuminate\Support\Facades\Storage;
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use App\Services\TomTool\Telegram\Slave as TeleSlave;
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use App\Services\TomTool\Flow;
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class GetController extends Controller
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{
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private $iStartNum = 0; // 改个名字，更有语义
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private $iMaxTry = 5; // 最大尝试次数
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public function urlbyNum(Request $oRequest)
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{
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$oFlow = Flow::start("urlByNum");
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$sAuthorCode = $oRequest->input("sAuthorCode");
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$iNum = (int)$oRequest->input("iNum", 1);
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$this->iStartNum = $iNum;
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return $this->findValidUrl($sAuthorCode, $iNum, $oFlow);
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}
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private function findValidUrl($sAuthorCode, $iNum, $oFlow)
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{
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try {
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$oQuery = ModelArticles::where("sAuthorCode", $sAuthorCode)->orderBy("id", "asc");
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$iTotal = $oQuery->count();
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if ($iTotal === 0) throw new \Exception("作者 [{$sAuthorCode}] 旗下无任何记录");
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// 1. 计算当前查库的偏移量，用 % 取模是最稳的，或者用 if 但不要改 iNum 本身
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$iOffset = ($iNum - 1) % $iTotal;
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$iTrueNum = $iOffset + 1; // 真正对应数据库的第几条
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$oArticle = $oQuery->skip($iOffset)->first();
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// 2. 拼文件名
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$aThumbUse = $oArticle->aOpt["thumb_use"] ?? ["b"];
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$sThumbUse = $aThumbUse[array_rand($aThumbUse)];
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$sFileName = $oArticle->sCode . '-1-' . 'thumb_' . $sThumbUse . '.jpg';
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// 3. 检查文件
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if (!Storage::disk('upload_images')->exists($sFileName)) {
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// 报警
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TeleSlave::warn()->enableSlaveQueue(false)->enableAsync(false)->send("findValidUrl：图片文件不存在：{$sFileName}");
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// 💡 这里的出口判定最重要！
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// 如果尝试次数已经超过了最大限制，或者已经把库里所有的记录都扫了一遍还没找到
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if ($iNum >= ($this->iStartNum + $this->iMaxTry) || $iNum >= ($this->iStartNum + $iTotal)) {
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throw new \Exception("该作者连续查找多张图片均不存在，已停止尝试");
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}
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// 递归：iNum 必须一直往上涨，不能回头！
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return $this->findValidUrl($sAuthorCode, $iNum + 1, $oFlow);
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}
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// 4. 成功
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$aData = [
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"sFileUrl" => Storage::disk('upload_images')->url($sFileName),
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"iTrueNum" => $iTrueNum,
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];
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return response()->json($oFlow->setDataA($aData)->done()->toArray());
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} catch (\Exception $e) {
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$sMsg = $e->getMessage();
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TeleSlave::warn()->enableSlaveQueue(false)->enableAsync(false)->send($sMsg);
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return response()->json($oFlow->fail($sMsg)->toArray());
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}
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}
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}
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