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- .claude/CLAUDE.md - .claude/commands/subagentes.md - .claude/rules/INDEX.md - .mcp.json - bash/functions/cybersecurity/analyze_dns.md - bash/functions/cybersecurity/audit_http_headers.md - bash/functions/cybersecurity/audit_ssh_config.md - bash/functions/cybersecurity/check_firewall.md - bash/functions/cybersecurity/detect_suspicious_users.md - bash/functions/cybersecurity/encrypt_file.md - ... Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
45 lines
1.9 KiB
Markdown
45 lines
1.9 KiB
Markdown
---
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name: logger_new
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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 LoggerNew(level LogLevel, output io.Writer, format string) (*Logger, error)"
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description: "Crea un Logger estructurado sobre log/slog con nivel, destino y formato configurables. Formato soportado: json o text. Si output es nil cae en os.Stderr."
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tags: [logging, log, slog, logger, infra, pendiente-usar]
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uses_functions: []
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uses_types: [Logger_go_infra, LogLevel_go_infra]
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returns: [Logger_go_infra]
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returns_optional: true
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error_type: "error_go_core"
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imports: [fmt, io, log/slog, os]
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params:
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- name: level
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desc: "nivel minimo de log (LogLevelDebug, LogLevelInfo, LogLevelWarn o LogLevelError)"
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- name: output
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desc: "destino de los logs (os.Stdout, os.Stderr, un archivo, bytes.Buffer). Si es nil se usa os.Stderr"
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- name: format
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desc: "formato de los logs: \"json\" para maquina o \"text\" para desarrollo local"
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output: "Logger listo para usar con LogInfo/LogWarn/... o error si el formato no es valido"
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tested: true
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tests: ["crea logger JSON valido", "crea logger text valido", "rechaza formato invalido", "output nil cae en os.Stderr sin panic", "emite JSON valido al escribir", "filtra mensajes debajo del nivel configurado"]
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test_file_path: "functions/infra/logger_test.go"
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file_path: "functions/infra/logger_new.go"
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---
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## Ejemplo
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```go
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logger, err := LoggerNew(LogLevelInfo, os.Stdout, "json")
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if err != nil {
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log.Fatal(err)
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}
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LogInfo(logger, "server starting", "port", 8484)
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// {"time":"...","level":"INFO","msg":"server starting","port":8484}
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```
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## Notas
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Funcion impura — internamente construye `slog.NewJSONHandler` o `slog.NewTextHandler` segun el formato y lo envuelve en `slog.New()`. El campo privado `inner` del Logger es el `*slog.Logger` real. Cada Logger es inmutable una vez creado: para anadir campos usar `LoggerWith`, que retorna una copia.
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