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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>
57 lines
2.1 KiB
Markdown
57 lines
2.1 KiB
Markdown
---
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name: config_from_env
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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 ConfigFromEnv(target any) error"
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description: "Puebla una struct de configuracion desde variables de entorno usando reflection y struct tags (env, default, required, secret). Soporta string, int, int64, bool, float64 y []string (comma-separated). Acumula todos los errores antes de retornar."
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tags: [config, env, reflect, infra, tags, pendiente-usar]
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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: [fmt, os, reflect, strconv, strings]
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params:
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- name: target
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desc: "puntero no-nil a struct con tags env, default, required y/o secret en sus campos exportados"
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output: "nil si la struct se poblo correctamente, error si falta una variable required o hay un tipo incompatible"
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tested: true
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tests:
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- "populate string field desde env"
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- "populate int field con conversion"
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- "populate bool field con conversion"
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- "populate float64 field"
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- "populate slice string comma-separated"
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- "valor default usado cuando env no seteada"
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- "required sin valor retorna error"
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- "int invalido retorna error descriptivo"
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- "puntero nil retorna error"
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test_file_path: "functions/infra/config_from_env_test.go"
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file_path: "functions/infra/config_from_env.go"
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---
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## Ejemplo
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```go
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type AppConfig struct {
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Host string `env:"HOST" default:"localhost"`
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Port int `env:"PORT" default:"8080" required:"true"`
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APIKey string `env:"API_KEY" required:"true" secret:"true"`
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Tags []string `env:"TAGS" default:"prod,stable"`
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Debug bool `env:"DEBUG" default:"false"`
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Timeout float64 `env:"TIMEOUT" default:"30.0"`
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}
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var cfg AppConfig
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if err := ConfigFromEnv(&cfg); err != nil {
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log.Fatal(err)
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}
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```
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## Notas
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Sin dependencias externas — solo stdlib. Tipos soportados: string, int/int64, uint/uint64, bool, float32/float64, []string. Los []string se parsean splitteando por coma y trimeando espacios. El tag secret:"true" no tiene efecto en runtime (solo documentacion — ver ConfigDump para ocultar al loggear).
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