status-go/geth/signal/signals.go

102 lines
2.9 KiB
Go

package signal
/*
#include <stddef.h>
#include <stdbool.h>
extern bool StatusServiceSignalEvent(const char *jsonEvent);
*/
import "C"
import (
"encoding/json"
"sync"
"github.com/status-im/status-go/geth/log"
)
const (
// EventNodeStarted is triggered when underlying node is started
EventNodeStarted = "node.started"
// EventNodeReady is triggered when underlying node is fully ready
// (consider backend to be fully registered)
EventNodeReady = "node.ready"
// EventNodeStopped is triggered when underlying node is fully stopped
EventNodeStopped = "node.stopped"
// EventNodeCrashed is triggered when node crashes
EventNodeCrashed = "node.crashed"
// EventChainDataRemoved is triggered when node's chain data is removed
EventChainDataRemoved = "chaindata.removed"
)
// Envelope is a general signal sent upward from node to RN app
type Envelope struct {
Type string `json:"type"`
Event interface{} `json:"event"`
}
// NodeCrashEvent is special kind of error, used to report node crashes
type NodeCrashEvent struct {
Error error `json:"error"`
}
// MarshalJSON implements the json.Marshaller interface.
func (e NodeCrashEvent) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Error string `json:"error"`
}{
Error: e.Error.Error(),
})
}
// NodeNotificationHandler defines a handler able to process incoming node events.
// Events are encoded as JSON strings.
type NodeNotificationHandler func(jsonEvent string)
var notificationHandler NodeNotificationHandler = TriggerDefaultNodeNotificationHandler
// notificationHandlerMutex guards notificationHandler for concurrent calls
var notificationHandlerMutex sync.RWMutex
// SetDefaultNodeNotificationHandler sets notification handler to invoke on Send
func SetDefaultNodeNotificationHandler(fn NodeNotificationHandler) {
notificationHandlerMutex.Lock()
notificationHandler = fn
notificationHandlerMutex.Unlock()
}
// ResetDefaultNodeNotificationHandler sets notification handler to default one
func ResetDefaultNodeNotificationHandler() {
notificationHandlerMutex.Lock()
notificationHandler = TriggerDefaultNodeNotificationHandler
notificationHandlerMutex.Unlock()
}
// TriggerDefaultNodeNotificationHandler triggers default notification handler (helpful in tests)
func TriggerDefaultNodeNotificationHandler(jsonEvent string) {
log.Info("Notification received", "event", jsonEvent)
}
// Send sends application signal (JSON, normally) upwards to application (via default notification handler)
func Send(signal Envelope) {
data, _ := json.Marshal(&signal)
C.StatusServiceSignalEvent(C.CString(string(data)))
}
//export NotifyNode
//nolint: golint
func NotifyNode(jsonEvent *C.char) {
notificationHandlerMutex.RLock()
defer notificationHandlerMutex.RUnlock()
notificationHandler(C.GoString(jsonEvent))
}
//export TriggerTestSignal
//nolint: golint
func TriggerTestSignal() {
C.StatusServiceSignalEvent(C.CString(`{"answer": 42}`))
}