init

internal/config.go

@@ -0,0 +1,62 @@
+package internal
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"time"
+)
+
+const (
+	defaultCheckInterval = 5 * 60
+
+	envKeyDnsToCheck           = "CLOUDFLARE_DNS_TO_CHECK"
+	envKeyPublicIpResolverTag  = "PUBLIC_IP_RESOLVER"
+	envKeyCloudflareApiKey     = "CLOUDFLARE_API_KEY"
+	envKeyCloudflareZone       = "CLOUDFLARE_ZONE"
+	envKeyOnChangeComment      = "ON_CHANGE_COMMENT"
+	envKeyCheckIntervalSeconds = "CHECK_INTERVAL_SECONDS"
+)
+
+type Config struct {
+	DnsRecordsToCheck   []string
+	PublicIpResolverTag string
+	ApiToken            string
+	CloudflareZone      string
+	OnChangeComment     string
+	CheckInterval       time.Duration
+}
+
+func (c Config) Validate() error {
+	if c.ApiToken == "" {
+		return fmt.Errorf("empty api token env key %s", envKeyCloudflareApiKey)
+	}
+
+	if c.CloudflareZone == "" {
+		return fmt.Errorf("empty zone in env key %s", envKeyCloudflareZone)
+	}
+
+	if len(c.DnsRecordsToCheck) == 0 {
+		return fmt.Errorf("no dns to check defined in env key %s", envKeyDnsToCheck)
+	}
+
+	return nil
+}
+
+func NewConfig() Config {
+	checkInterval, err := strconv.ParseInt(os.Getenv(envKeyCheckIntervalSeconds), 10, 64)
+	if err != nil {
+		log.Printf("wrong `%s` value. Check interval set default(%ds)", envKeyCheckIntervalSeconds, defaultCheckInterval)
+		checkInterval = defaultCheckInterval
+	}
+
+	return Config{
+		DnsRecordsToCheck:   parseDNSToCheck(os.Getenv(envKeyDnsToCheck)),
+		PublicIpResolverTag: os.Getenv(envKeyPublicIpResolverTag),
+		ApiToken:            os.Getenv(envKeyCloudflareApiKey),
+		CloudflareZone:      os.Getenv(envKeyCloudflareZone),
+		OnChangeComment:     os.Getenv(envKeyOnChangeComment),
+		CheckInterval:       time.Duration(checkInterval) * time.Second,
+	}
+}