egutierrez
53200cbc0d
Nuevas funciones Go con tests en tres dominios: - core: parse_cron_expr, next_cron_time, join_by_key, validate_struct_fields + tipo CronSchedule - datascience: pivot (tabla dinámica), diff_entities (comparación de entidades) - infra: http_get_json, http_post_json, http_download_file, cache_to_sqlite, cron_ticker Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
59 lines
1.8 KiB
Markdown
59 lines
1.8 KiB
Markdown
---
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name: cache_to_sqlite
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kind: function
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lang: go
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domain: infra
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version: "1.0.0"
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purity: impure
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signature: "func CacheToSQLite(dbPath, namespace string) (*SQLiteCache, error)"
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description: "Cache key-value persistido en SQLite con TTL y lazy eviction. Valores almacenados como JSON bytes; el caller serializa y deserializa. Thread-safe con sync.Mutex. Soporta Get, Set, Delete, Clear y GetOrSet."
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tags: [cache, sqlite, persistence, ttl, key-value, concurrent]
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uses_functions: []
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uses_types: []
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returns: []
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returns_optional: false
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error_type: "error_go_core"
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imports: ["database/sql", "encoding/json", "sync", "time", "fmt"]
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tested: true
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tests:
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- "Set/Get basico"
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- "TTL expirado"
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- "GetOrSet con factory"
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- "Concurrencia (goroutines)"
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test_file_path: "functions/infra/cache_to_sqlite_test.go"
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file_path: "functions/infra/cache_to_sqlite.go"
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---
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## Ejemplo
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```go
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cache, err := infra.CacheToSQLite("my_cache.db", "default")
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if err != nil {
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log.Fatal(err)
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}
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defer cache.Close()
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// Almacenar JSON bytes con TTL de 1 hora
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payload, _ := json.Marshal(map[string]string{"result": "ok"})
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cache.Set("key1", payload, time.Hour)
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// Recuperar
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if v, ok := cache.Get("key1"); ok {
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var result map[string]string
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json.Unmarshal(v, &result)
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fmt.Println(result["result"]) // ok
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}
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// Factory pattern
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val, err := cache.GetOrSet("expensive_key", func() ([]byte, error) {
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return json.Marshal(computeExpensiveThing())
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}, time.Hour)
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// Helper para serializar directamente
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cache.SetJSON("user:42", userStruct, 30*time.Minute)
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```
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## Notas
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Usa WAL mode para mejor concurrencia de lecturas. La eviction lazy elimina expirados en cada `Get`. El schema comparte la tabla `cache` con `cache_to_sqlite_py_infra` — ambas implementaciones son interoperables sobre el mismo archivo SQLite si usan namespaces distintos. Requiere `github.com/mattn/go-sqlite3` (ya presente en el registry).
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