Jonas Kaninda
83 lines
2.6 KiB
Go
83 lines
2.6 KiB
Go
package main
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import (
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"fmt"
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"strings"
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goutils "github.com/jkaninda/go-utils"
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)
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// Config is the runtime configuration, read entirely from environment
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// variables — the twelve-factor way, and exactly how Miabi injects settings
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// into a deployed application (Postgres connection details land here when you
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// attach a managed database to the app).
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type Config struct {
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Port int
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DBDriver string // "postgres" or "sqlite"
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DatabaseDSN string
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AppName string
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Version string
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Seed bool
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}
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// LoadConfig builds the Config from the environment.
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func LoadConfig() (Config, error) {
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driver, dsn := resolveDatabase()
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return Config{
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Port: goutils.EnvInt("PORT", 8080),
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AppName: goutils.Env("APP_NAME", "Miabi Guestbook"),
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Version: resolveVersion(),
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Seed: goutils.Env("SEED", "true") == "true",
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DBDriver: driver,
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DatabaseDSN: dsn,
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}, nil
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}
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// resolveDatabase picks the database driver and DSN.
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//
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// The driver comes from DB_DRIVER (postgres|sqlite). When DB_DRIVER is unset it
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// is inferred: if Postgres is configured (DATABASE_URL or DB_HOST is present)
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// Postgres is used; otherwise the app falls back to a zero-config SQLite file —
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// handy for local dev and demos with nothing else to set up. On Miabi, attach a
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// managed Postgres and it is selected automatically.
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func resolveDatabase() (driver, dsn string) {
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driver = strings.ToLower(goutils.Env("DB_DRIVER", ""))
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if driver == "" {
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if goutils.Env("DATABASE_URL", "") != "" || goutils.Env("DB_HOST", "") != "" {
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driver = "postgres"
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} else {
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driver = "sqlite"
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}
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}
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switch driver {
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case "sqlite", "sqlite3":
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// A file path; use ":memory:" for an ephemeral in-memory database. The
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// parent directory is created on startup. In the container this defaults
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// to /data (a volume); see DB_PATH in the Dockerfile.
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return "sqlite", goutils.Env("DB_PATH", "data/guestbook.db")
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default:
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return "postgres", postgresDSN()
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}
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}
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// postgresDSN resolves the Postgres connection, following Miabi's convention:
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//
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// - DATABASE_URL — a full DSN (URL or key=value). Preferred, and what Miabi's
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// managed databases inject. When set, it is used verbatim.
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// - Discrete DB_* variables — assembled into a key=value DSN otherwise.
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func postgresDSN() string {
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if url := goutils.Env("DATABASE_URL", ""); url != "" {
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return url
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}
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return fmt.Sprintf(
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"host=%s user=%s password=%s dbname=%s port=%d sslmode=%s",
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goutils.Env("DB_HOST", "localhost"),
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goutils.Env("DB_USER", "postgres"),
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goutils.Env("DB_PASSWORD", "postgres"),
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goutils.Env("DB_NAME", "guestbook"),
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goutils.EnvInt("DB_PORT", 5432),
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goutils.Env("DB_SSL_MODE", "disable"),
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)
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}
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