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state.go
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state.go
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package connection
import (
"fmt"
)
// State represents device connection state and type,
// as reported by mobile framework.
//
// Zero value represents default assumption about network (online and unknown type).
type State struct {
Offline bool `json:"offline"`
Type Type `json:"type"`
Expensive bool `json:"expensive"`
}
// Type represents description of available
// connection types as reported by React Native (see
// https://facebook.github.io/react-native/docs/netinfo.html)
// We're interested mainly in 'wifi' and 'cellular', but
// other types are also may be used.
type Type byte
const (
Offline = "offline"
Wifi = "wifi"
Cellular = "cellular"
Unknown = "unknown"
None = "none"
)
// NewType creates new Type from string.
func NewType(s string) Type {
switch s {
case Cellular:
return connectionCellular
case Wifi:
return connectionWifi
}
return connectionUnknown
}
// Type constants
const (
connectionUnknown Type = iota
connectionCellular // cellular, LTE, 4G, 3G, EDGE, etc.
connectionWifi // WIFI or iOS simulator
)
func (c State) IsExpensive() bool {
return c.Expensive || c.Type == connectionCellular
}
// string formats ConnectionState for logs. Implements Stringer.
func (c State) String() string {
if c.Offline {
return Offline
}
var typ string
switch c.Type {
case connectionWifi:
typ = Wifi
case connectionCellular:
typ = Cellular
default:
typ = Unknown
}
if c.Expensive {
return fmt.Sprintf("%s (expensive)", typ)
}
return typ
}