Add API to listen to app state changes.

This commit is contained in:
Igor Mandrigin 2018-03-14 16:46:21 +01:00 committed by Igor Mandrigin
parent 81c8669518
commit 3b92b61ef1
5 changed files with 95 additions and 0 deletions

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@ -234,3 +234,14 @@ func (api *StatusAPI) ConnectionChange(typ string, expensive bool) {
}
api.b.ConnectionChange(state)
}
// AppStateChange handles app state changes (background/foreground).
// state values: see https://facebook.github.io/react-native/docs/appstate.html
func (api *StatusAPI) AppStateChange(state string) {
appState, err := ParseAppState(state)
if err != nil {
log.Error("AppStateChange failed, ignoring it:", err)
return // and do nothing
}
api.b.AppStateChange(appState)
}

42
geth/api/app_state.go Normal file
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@ -0,0 +1,42 @@
package api
import (
"fmt"
"strings"
)
// AppState represents if the app is in foreground, background or some other state
type AppState string
func (a AppState) String() string {
return string(a)
}
// Specific app states
// see https://facebook.github.io/react-native/docs/appstate.html
const (
AppStateForeground = AppState("foreground")
AppStateBackground = AppState("background")
AppStateInactive = AppState("inactive")
AppStateInvalid = AppState("")
)
// validAppStates returns an immutable set of valid states.
func validAppStates() []AppState {
return []AppState{AppStateInactive, AppStateBackground, AppStateForeground}
}
// ParseAppState creates AppState from a string
func ParseAppState(stateString string) (AppState, error) {
// a bit of cleaning up
stateString = strings.ToLower(strings.TrimSpace(stateString))
for _, state := range validAppStates() {
if stateString == state.String() {
return state, nil
}
}
return AppStateInvalid, fmt.Errorf("could not parse app state: %s", stateString)
}

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@ -0,0 +1,28 @@
package api
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestParseAppType(t *testing.T) {
check := func(input string, expectedState AppState, expectError bool) {
actualState, err := ParseAppState(input)
assert.Equalf(t, expectedState, actualState, "unexpected result from ParseAppState")
if expectError {
assert.NotNil(t, err, "error should not be nil")
}
}
check("foreground", AppStateForeground, false)
check("background", AppStateBackground, false)
check("inactive", AppStateInactive, false)
check(" forEGROUnd ", AppStateForeground, false)
check(" backGROUND ", AppStateBackground, false)
check(" INACTIVE ", AppStateInactive, false)
check("", AppStateInvalid, true)
check("back ground", AppStateInvalid, true)
check(" back ground ", AppStateInvalid, true)
check(" ", AppStateInvalid, true)
}

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@ -236,3 +236,11 @@ func (b *StatusBackend) ConnectionChange(state ConnectionState) {
// logic of handling state changes here
// restart node? force peers reconnect? etc
}
// AppStateChange handles app state changes (background/foreground).
func (b *StatusBackend) AppStateChange(state AppState) {
log.Info("App State changed: %s", state)
// TODO: put node in low-power mode if the app is in background (or inactive)
// and normal mode if the app is in foreground.
}

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@ -456,3 +456,9 @@ func AddPeer(enode *C.char) *C.char {
func ConnectionChange(typ *C.char, expensive C.int) {
statusAPI.ConnectionChange(C.GoString(typ), expensive == 1)
}
// AppStateChange handles app state changes (background/foreground).
//export AppStateChange
func AppStateChange(state *C.char) {
statusAPI.AppStateChange(C.GoString(state))
}