63 lines
1.6 KiB
PHP
63 lines
1.6 KiB
PHP
<?php
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namespace App\Services;
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use App\Models\Terminal;
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use Illuminate\Support\Facades\Log;
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class KnowledgeContextService
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{
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private const MAX_CONTEXT_LENGTH = 2000;
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public function __construct(
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private DocumentSearchService $searchService,
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) {}
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/**
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* 搜索知识库中的文档，返回 RAG 上下文
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*/
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public function search(string $query, ?Terminal $terminal = null): array
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{
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$stationIds = $terminal?->station_id ? [$terminal->station_id] : [];
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$results = $this->searchService->search($query, $stationIds);
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if ($results->isEmpty()) {
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return ['context' => '', 'sources' => []];
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}
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$context = '';
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$sources = [];
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foreach ($results as $document) {
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$snippet = $this->extractSnippet($document);
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if (mb_strlen($context) + mb_strlen($snippet) > self::MAX_CONTEXT_LENGTH) {
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break;
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}
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$context .= $snippet . "\n\n";
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$sources[] = [
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'title' => $document->title,
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'id' => 'kb-doc-' . str_pad($document->id, 3, '0', STR_PAD_LEFT),
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];
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}
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return [
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'context' => trim($context),
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'sources' => $sources,
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];
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}
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private function extractSnippet($document): string
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{
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$content = $document->getMarkdownContent() ?? $document->description ?? '';
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if (mb_strlen($content) <= 500) {
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return "【{$document->title}】\n{$content}";
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}
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return "【{$document->title}】\n" . mb_substr($content, 0, 500) . '...';
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}
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}
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