112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
package signal
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/*
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#include <stddef.h>
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#include <stdbool.h>
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extern bool StatusServiceSignalEvent(const char *jsonEvent);
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*/
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import "C"
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import (
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"encoding/json"
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"sync"
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"github.com/ethereum/go-ethereum/log"
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)
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const (
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// EventNodeStarted is triggered when underlying node is started
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EventNodeStarted = "node.started"
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// EventNodeReady is triggered when underlying node is fully ready
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// (consider backend to be fully registered)
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EventNodeReady = "node.ready"
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// EventNodeStopped is triggered when underlying node is fully stopped
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EventNodeStopped = "node.stopped"
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// EventNodeCrashed is triggered when node crashes
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EventNodeCrashed = "node.crashed"
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// EventChainDataRemoved is triggered when node's chain data is removed
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EventChainDataRemoved = "chaindata.removed"
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// EventEnvelopeSent is triggered when envelope was sent atleast to a one peer.
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EventEnvelopeSent = "envelope.sent"
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// EventEnvelopeExpired is triggered when envelop was dropped by a whisper without being sent
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// to any peer
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EventEnvelopeExpired = "envelope.expired"
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)
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// Envelope is a general signal sent upward from node to RN app
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type Envelope struct {
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Type string `json:"type"`
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Event interface{} `json:"event"`
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}
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// NodeCrashEvent is special kind of error, used to report node crashes
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type NodeCrashEvent struct {
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Error error `json:"error"`
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}
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// All general log messages in this package should be routed through this logger.
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var logger = log.New("package", "status-go/geth/signal")
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// MarshalJSON implements the json.Marshaller interface.
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func (e NodeCrashEvent) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Error string `json:"error"`
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}{
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Error: e.Error.Error(),
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})
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}
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// NodeNotificationHandler defines a handler able to process incoming node events.
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// Events are encoded as JSON strings.
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type NodeNotificationHandler func(jsonEvent string)
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var notificationHandler NodeNotificationHandler = TriggerDefaultNodeNotificationHandler
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// notificationHandlerMutex guards notificationHandler for concurrent calls
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var notificationHandlerMutex sync.RWMutex
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// SetDefaultNodeNotificationHandler sets notification handler to invoke on Send
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func SetDefaultNodeNotificationHandler(fn NodeNotificationHandler) {
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notificationHandlerMutex.Lock()
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notificationHandler = fn
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notificationHandlerMutex.Unlock()
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}
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// ResetDefaultNodeNotificationHandler sets notification handler to default one
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func ResetDefaultNodeNotificationHandler() {
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notificationHandlerMutex.Lock()
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notificationHandler = TriggerDefaultNodeNotificationHandler
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notificationHandlerMutex.Unlock()
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}
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// TriggerDefaultNodeNotificationHandler triggers default notification handler (helpful in tests)
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func TriggerDefaultNodeNotificationHandler(jsonEvent string) {
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logger.Info("Notification received", "event", jsonEvent)
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}
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// Send sends application signal (JSON, normally) upwards to application (via default notification handler)
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func Send(signal Envelope) {
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data, _ := json.Marshal(&signal)
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C.StatusServiceSignalEvent(C.CString(string(data)))
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}
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//export NotifyNode
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//nolint: golint
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func NotifyNode(jsonEvent *C.char) {
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notificationHandlerMutex.RLock()
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defer notificationHandlerMutex.RUnlock()
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notificationHandler(C.GoString(jsonEvent))
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}
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//export TriggerTestSignal
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//nolint: golint
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func TriggerTestSignal() {
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C.StatusServiceSignalEvent(C.CString(`{"answer": 42}`))
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}
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