feat: implement core daemon (config, fire client, scheduler)

self-hosted/config.go

@@ -0,0 +1,104 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+	"text/template"
+	"time"
+
+	"github.com/robfig/cron/v3"
+)
+
+const defaultTextTemplate = "Scheduled trigger at {{.LocalTime}}"
+
+// Config is the validated runtime configuration assembled from env vars.
+type Config struct {
+	FireURL   string
+	Token     string
+	Schedules []string
+	Location  *time.Location
+	Template  *template.Template
+	LogLevel  string
+}
+
+// Load reads env vars and returns a fully validated Config or an error.
+// All required vars must be present and all parsed values must pass validation.
+func Load() (*Config, error) {
+	cfg := &Config{}
+
+	cfg.FireURL = strings.TrimSpace(os.Getenv("ROUTINE_FIRE_URL"))
+	if cfg.FireURL == "" {
+		return nil, errors.New("missing required env var ROUTINE_FIRE_URL")
+	}
+
+	cfg.Token = strings.TrimSpace(os.Getenv("ROUTINE_FIRE_TOKEN"))
+	if cfg.Token == "" {
+		return nil, errors.New("missing required env var ROUTINE_FIRE_TOKEN")
+	}
+
+	rawCron := os.Getenv("CRON_SCHEDULE")
+	schedules, err := parseSchedules(rawCron)
+	if err != nil {
+		return nil, err
+	}
+	cfg.Schedules = schedules
+
+	tz := strings.TrimSpace(os.Getenv("TZ"))
+	if tz == "" {
+		cfg.Location = time.UTC
+	} else {
+		loc, err := time.LoadLocation(tz)
+		if err != nil {
+			return nil, fmt.Errorf("invalid TZ %q: %w", tz, err)
+		}
+		cfg.Location = loc
+	}
+
+	rawTpl := os.Getenv("TEXT_TEMPLATE")
+	if rawTpl == "" {
+		rawTpl = defaultTextTemplate
+	}
+	tpl, err := template.New("text").Parse(rawTpl)
+	if err != nil {
+		return nil, fmt.Errorf("invalid TEXT_TEMPLATE: %w", err)
+	}
+	cfg.Template = tpl
+
+	cfg.LogLevel = strings.TrimSpace(os.Getenv("LOG_LEVEL"))
+	if cfg.LogLevel == "" {
+		cfg.LogLevel = "info"
+	}
+
+	return cfg, nil
+}
+
+var scheduleSeparators = regexp.MustCompile(`[;\n]+`)
+
+// parseSchedules splits CRON_SCHEDULE on `;` or newlines, trims, drops empties,
+// and validates each expression against the standard 5-field parser.
+func parseSchedules(raw string) ([]string, error) {
+	if strings.TrimSpace(raw) == "" {
+		return nil, errors.New("missing required env var CRON_SCHEDULE")
+	}
+	parts := scheduleSeparators.Split(raw, -1)
+	parser := cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow)
+
+	out := make([]string, 0, len(parts))
+	for _, p := range parts {
+		s := strings.TrimSpace(p)
+		if s == "" {
+			continue
+		}
+		if _, err := parser.Parse(s); err != nil {
+			return nil, fmt.Errorf("invalid cron %q: %w", s, err)
+		}
+		out = append(out, s)
+	}
+	if len(out) == 0 {
+		return nil, errors.New("CRON_SCHEDULE has no non-empty expressions")
+	}
+	return out, nil
+}