package tcp import ( "os" "strings" "github.com/libp2p/go-reuseport" ) // envReuseport is the env variable name used to turn off reuse port. // It default to true. const envReuseport = "LIBP2P_TCP_REUSEPORT" const deprecatedEnvReuseport = "IPFS_REUSEPORT" // envReuseportVal stores the value of envReuseport. defaults to true. var envReuseportVal = true func init() { v := strings.ToLower(os.Getenv(envReuseport)) if v == "false" || v == "f" || v == "0" { envReuseportVal = false log.Infof("REUSEPORT disabled (LIBP2P_TCP_REUSEPORT=%s)", v) } v, exist := os.LookupEnv(deprecatedEnvReuseport) if exist { log.Warning("IPFS_REUSEPORT is deprecated, use LIBP2P_TCP_REUSEPORT instead") if v == "false" || v == "f" || v == "0" { envReuseportVal = false log.Infof("REUSEPORT disabled (IPFS_REUSEPORT=%s)", v) } } } // reuseportIsAvailable returns whether reuseport is available to be used. This // is here because we want to be able to turn reuseport on and off selectively. // For now we use an ENV variable, as this handles our pressing need: // // LIBP2P_TCP_REUSEPORT=false ipfs daemon // // If this becomes a sought after feature, we could add this to the config. // In the end, reuseport is a stop-gap. func ReuseportIsAvailable() bool { return envReuseportVal && reuseport.Available() }