38 lines
876 B
Go
38 lines
876 B
Go
package server
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import (
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"flag"
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"fmt"
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"os"
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"github.com/asaskevich/govalidator"
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)
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// GetListenAddressFromEnvOrFlags will check flag --host and --port to construct the listen address
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// If they doesn't exist it will fallback on HOST and PORT environment variable and finally fallback
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// to the default value localhost:8080.
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func GetListenAddressFromEnvOrFlags() (string, error) {
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host := os.Getenv("HOST")
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port := os.Getenv("PORT")
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if host == "" {
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host = "localhost"
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}
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if port == "" {
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port = "8080"
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}
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pHost := flag.String("host", host, "Host address to listen to")
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pPort := flag.String("port", port, "Port to listen to")
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if !govalidator.IsHost(*pHost) {
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return "", fmt.Errorf("provided 'host' is invalid")
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}
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if !govalidator.IsPort(*pPort) {
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return "", fmt.Errorf("provided 'port' is invalid")
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}
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return fmt.Sprintf("%s:%s", *pHost, *pPort), nil
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}
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